阅读说明：本技术 一种建筑精密恒温控制装置及其控制方法 (Precise constant-temperature control device for building and control method thereof ) 是由 聂正英 林元同 邓湘宁 郝光宇 赵建云 罗浩 蔡丽 王继发 朱成 郭崇 王瑜 于 2021-06-16 设计创作，主要内容包括：本发明公开了一种建筑精密恒温控制装置及其控制方法,涉及建筑精密恒温控制装置技术领域,为解决现有的建筑精密恒温控制装置检测建筑温度精度降低,不能精确精测环境变化的问题。所述安装固定部的上端安装有上部连接部,所述上部连接部内部下端安装有控制箱,所述控制箱的上端安装有安装凸台,所述上部连接部的上端安装有室内顶部导热板,所述室内顶部导热板一侧的上端安装有室内底部红外温度传感器,所述上部连接部内部另一侧的上端安装有室内顶部红外温度传感器,所述安装固定部内部的下端安装有底部固定板,所述底部固定板的上端安装有驱动丝杆。(The invention discloses a building precise constant temperature control device and a control method thereof, relates to the technical field of building precise constant temperature control devices, and aims to solve the problems that the existing building precise constant temperature control device can not precisely measure environmental changes due to the fact that the building temperature is detected to be reduced in precision. The utility model discloses an infrared temperature sensor of indoor top is installed to the upper end of indoor top heat-conducting plate, the installation fixed part, the upper portion connecting portion are installed to the upper end of installation fixed part, the control box is installed to the inside lower extreme of upper portion connecting portion, the installation boss is installed to the upper end of control box, indoor top heat-conducting plate is installed to the upper end of upper portion connecting portion, indoor bottom infrared temperature sensor is installed to the upper end of indoor top heat-conducting plate one side, indoor top infrared temperature sensor is installed to the upper end of the inside opposite side of upper portion connecting portion, the bottom fixed plate is installed to the inside lower extreme of installation fixed part, drive lead screw is installed to the upper end of bottom fixed plate.)

1. The utility model provides a building precision thermostatic control device, includes installation fixed part (1), its characterized in that: the upper portion connecting portion (4) is installed to the upper end of installation fixed part (1), control box (11) is installed to the inside lower extreme of upper portion connecting portion (4), installation base (7) is installed to the upper end of control box (11), indoor top heat-conducting plate (6) is installed to the upper end of upper portion connecting portion (4), indoor bottom infrared temperature sensor (9) are installed to the upper end of indoor top heat-conducting plate (6) one side, indoor top infrared temperature sensor (20) are installed to the upper end of the inside opposite side of upper portion connecting portion (4), bottom fixed plate (17) are installed to the inside lower extreme of installation fixed part (1), drive lead screw (14) are installed to the upper end of bottom fixed plate (17), the externally mounted of drive lead screw (14) has removal mounting panel (15), building inside infrared temperature sensor (16) are all installed to the both sides of removal mounting panel (15), contact spring (13) are all installed to the both sides of installation fixed part (1), contact spring (13) are kept away from the one end of installation fixed part (1) and are installed inside heat-conducting plate (2) of building.

2. The precise thermostatic control device for buildings according to claim 1, characterized in that: mounting fixed part (1) inside lower extreme installs garter spring (19), garter spring (19)'s upper end is installed and is removed push pedal (18), clamping rod (3) are installed to the upper end of removing push pedal (18), clamping rod (3) pass through hinged joint with removal push pedal (18), the lower extreme of removing mounting panel (15) is installed and is dismantled push rod (21).

3. The precise thermostatic control device for buildings according to claim 1, characterized in that: the upper end of the control box (11) is provided with an irradiation atmosphere lamp (10), and the irradiation atmosphere lamp (10) is fixedly connected with the control box (11).

4. The precise thermostatic control device for buildings according to claim 1, characterized in that: high glass (8) of passing through is installed to the upper end of installation boss (7), high glass (8) of passing through and installation boss (7) fixed connection.

5. The precise thermostatic control device for buildings according to claim 1, characterized in that: shock attenuation sealing layer (5) are installed to the lower extreme of upper portion connecting portion (4), shock attenuation sealing layer (5) are connected with upper portion connecting portion (4) cementing.

6. The precise thermostatic control device for buildings according to claim 1, characterized in that: the mounting and fixing device is characterized in that a driving motor (12) is mounted at the upper end inside the mounting and fixing part (1), the driving motor (12) is fixedly connected with the mounting and fixing part (1), and the driving motor (12) is connected with a driving screw rod (14) through a coupler.

7. The precise thermostatic control device for buildings according to claim 2, characterized in that: the clamping spring (19) is connected with the movable push plate (18) in a welding mode, and the clamping spring (19) is provided with a plurality of clamping springs.

8. The precise thermostatic control device for buildings according to claim 1, characterized in that: upper portion connecting portion (4) and installation fixed part (1) fixed connection, control box (11) and upper portion connecting portion (4) fixed connection, upper portion connecting portion (4) and control box (11) fixed connection, indoor top heat-conducting plate (6) and upper portion connecting portion (4) fixed connection, remove mounting panel (15) and installation fixed part (1) through draw-in groove sliding connection, remove mounting panel (15) and pass through ball screw nut pair with drive screw (14) and be connected.

9. A control method of a precise constant temperature control device for a building is realized based on the precise constant temperature control device for the building of any one of claims 1 to 8, and is characterized by comprising the following steps:

the method comprises the following steps: the device is reversely buckled by a worker and installed indoors, the installation fixing part (1) is embedded into the top of a building, the damping sealing layer (5) is tightly attached to the top of the building, the device can move downwards under the action of gravity, the clamping spring (19) can push the movable push plate (18) to move, the clamping rod (3) is pushed out of the device to be in contact with the building, the device is clamped, and self-locking of the device is achieved;

step two: an indoor bottom infrared temperature sensor (9) detects the temperature of the ground below the device, so that the device records the temperature of the indoor ground, an indoor top infrared temperature sensor (20) detects the temperature of an indoor top heat-conducting plate (6) at the indoor top so as to obtain the temperature of the indoor top, a building internal infrared temperature sensor (16) detects the temperature of a building internal heat-conducting plate (2) under the action of a driving screw rod (14), and a contact spring (13) exerts a thrust force on the building internal heat-conducting plate (2) so that the building internal heat-conducting plate (2) is in close contact with a building, so that the building internal infrared temperature sensor (16) can detect the temperatures at different heights in the building;

step three: according to the difference in temperature and the temperature variation at both ends about building inside heat-conducting plate (2), obtain external environment's change, reach the season that the device was located, thereby make the device can carry out the control by temperature change to the change according to season and weather, when external environment appears undulantly, building inside infrared temperature sensor (16) detect out temperature variation at first, then transmit data to control box (11), indoor temperature that indoor bottom infrared temperature sensor (9) and indoor top infrared temperature sensor (20) gathered is recombined in control box (11), thereby make temperature control fast.

Technical Field

The invention relates to the technical field of building precise constant temperature control devices, in particular to a building precise constant temperature control device and a control method thereof.

Background

The building refers to an asset formed by artificial construction, belongs to the category of fixed assets, and comprises two categories of houses and structures. A house is an engineered building for people to live, work, study, produce, manage, entertain, store goods, and perform other social activities. The difference from a building is that the building is a structure, the structure refers to engineering buildings except a house, such as an enclosing wall, a road, a dam, a water well, a tunnel, a water tower, a bridge, a chimney and the like, the constant temperature is the constant temperature under a certain environment, a precise instrument is needed to measure the change of the temperature at any time, and then the temperature is regulated to be always one temperature, so the constant temperature of the building refers to the building capable of keeping a certain temperature for a long time.

However, the precision of the existing building precision constant temperature control device for detecting the temperature of the building is reduced, and the environment change cannot be precisely detected; therefore, the existing requirements are not met, and a precise building constant-temperature control device and a control method thereof are provided.

Disclosure of Invention

The invention aims to provide a building precise constant temperature control device and a control method thereof, and aims to solve the problems that the building precise constant temperature control device provided in the background technology detects that the precision of the building temperature is reduced and the environment change cannot be accurately and precisely detected.

In order to achieve the purpose, the invention provides the following technical scheme: a precise constant temperature control device for buildings comprises an installation fixing part, an upper connecting part is arranged at the upper end of the installation fixing part, the lower end in the upper connecting part is provided with a control box, the upper end of the control box is provided with an installation boss, an indoor top heat-conducting plate is arranged at the upper end of the upper connecting part, an indoor bottom infrared temperature sensor is arranged at the upper end of one side of the indoor top heat-conducting plate, the upper end of the other side in the upper connecting part is provided with an indoor top infrared temperature sensor, the lower end in the mounting and fixing part is provided with a bottom fixing plate, the upper end of the bottom fixing plate is provided with a driving screw rod, the outside of the driving screw rod is provided with a movable mounting plate, the infrared temperature sensor of building inside is all installed to the both sides of removal mounting panel, contact spring is all installed to the both sides of installation fixed part, contact spring keeps away from the one end of installation fixed part and installs the inside heat-conducting plate of building.

Preferably, the inside lower extreme of installation fixed part installs chucking spring, the removal push pedal is installed to chucking spring's upper end, the chucking pole is installed to the upper end of removing the push pedal, the chucking pole passes through hinged joint with the removal push pedal, the lower extreme of removing the mounting panel is installed and is dismantled the push rod.

Preferably, an irradiation atmosphere lamp is installed at the upper end of the control box, and the irradiation atmosphere lamp is fixedly connected with the control box.

Preferably, the upper end of the mounting boss is provided with high-transmittance glass, and the high-transmittance glass is fixedly connected with the mounting boss.

Preferably, the lower extreme of upper portion connecting portion installs the shock attenuation sealing layer, the shock attenuation sealing layer is connected with upper portion connecting portion cementing.

Preferably, a driving motor is installed at the upper end inside the installation fixing part, the driving motor is fixedly connected with the installation fixing part, and the driving motor is connected with the driving screw rod through a coupler.

Preferably, the clamping spring is connected with the movable push plate in a welding mode, and the clamping spring is provided with a plurality of clamping springs.

Preferably, upper portion connecting portion and installation fixed part fixed connection, control box and upper portion connecting portion fixed connection, upper portion connecting portion and control box fixed connection, indoor top heat-conducting plate and upper portion connecting portion fixed connection, the removal mounting panel passes through draw-in groove sliding connection with the installation fixed part, the removal mounting panel passes through ball screw nut pair with the drive lead screw and is connected.

A control method of a precise constant temperature control device for a building comprises the following steps:

the method comprises the following steps: the device is reversely buckled by a worker and installed indoors, the installation fixing part is embedded into the top of a building, the shock absorption sealing layer is tightly attached to the top of the building, the device can move downwards under the action of gravity, and the clamping spring can push the movable push plate to move, so that the clamping rod pushing device is contacted with the building, the device is clamped, and the self-locking of the device is realized;

step two: the infrared temperature sensor at the indoor bottom detects the temperature of the ground below the device, so that the device records the temperature of the indoor ground, the infrared temperature sensor at the indoor top detects the temperature of the heat-conducting plate at the indoor top so as to obtain the temperature of the indoor top, the infrared temperature sensor at the building interior detects the temperature of the heat-conducting plate at the building interior under the action of the driving screw rod, and the contact spring applies a thrust force to the heat-conducting plate at the building interior so that the heat-conducting plate at the building interior is in close contact with the building, so that the infrared temperature sensor at the building interior can detect the temperatures at different heights in the building;

step three: according to the difference in temperature and the temperature variation at both ends about the inside heat-conducting plate of building, obtain external environment's change, reach the device season of locating, thereby make the device can carry out the control by temperature change to the change according to season and weather, when external environment appears undulant, the inside infrared temperature sensor of building detects out temperature variation at first, then with data to the control box transmission, the control box combines the indoor temperature that indoor bottom infrared temperature sensor and indoor top infrared temperature sensor gathered again, thereby make temperature control fast.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention can detect the temperature of the indoor bottom by installing the indoor bottom infrared temperature sensor, can detect the indoor top temperature by installing the indoor top infrared temperature sensor, can accurately detect the temperature of different positions in the building by installing the building internal infrared temperature sensor to be matched with the driving screw rod, thereby obtaining the temperature change of the external environment, leading the external temperature control device of the device to respond in advance, avoiding responding only after the indoor temperature changes greatly, increasing the usability of the device, leading the indoor bottom infrared temperature sensor, the indoor top infrared temperature sensor and the building internal infrared temperature sensor to be mutually cooperated and leased to accurately detect the temperature of different heights in the building and indoors, leading the device to respond to the temperature change caused by the external environment change in time, leading the indoor temperature to be kept more stable, and preventing the indoor temperature from changing greatly, the contact spring is arranged to push the heat conducting plate in the building to be tightly attached to the building, so that the practicability of the device is improved, and the device is prevented from shaking and plays a certain fixing role;

2. the clamping spring is arranged, so that the movable push plate can be pushed upwards to push the clamping rod out of the device, the self-locking of the device is realized, the device is prevented from sliding, the installation is quicker and simpler, the installation difficulty of the device is reduced, the device is more convenient to use, and the working efficiency of workers is increased;

3. the invention can play a role in creating atmosphere by installing the irradiation atmosphere lamp, increases the functionality of the device, enables the device to be functional and humanized, simultaneously enables the device to be more beautiful, can enable the light to be transmitted out of the device by installing the high-transmittance glass, simultaneously plays a role in separation, plays a role in protecting the irradiation atmosphere lamp, and can increase the shock resistance of the device by installing the shock absorption sealing layer and simultaneously plays a role in sealing.

Drawings

FIG. 1 is a three-dimensional perspective view of a precise constant temperature control device for buildings and a control method thereof according to the present invention;

FIG. 2 is a schematic structural diagram of a precise constant temperature control device and a control method thereof for a building according to the present invention;

FIG. 3 is an enlarged view of a portion A of the present invention;

FIG. 4 is an enlarged view of a portion B of the present invention;

fig. 5 is a three-dimensional perspective view of the moving mounting plate of the present invention.

In the figure: 1. mounting a fixed part; 2. building interior heat-conducting plates; 3. a clamping rod; 4. an upper connecting portion; 5. a shock-absorbing sealing layer; 6. an indoor top heat conducting plate; 7. mounting a boss; 8. high-transparency glass; 9. an indoor bottom infrared temperature sensor; 10. irradiating an atmosphere lamp; 11. a control box; 12. a drive motor; 13. a contact spring; 14. driving the screw rod; 15. moving the mounting plate; 16. building interior infrared temperature sensors; 17. a bottom fixing plate; 18. moving the push plate; 19. a chucking spring; 20. an indoor top infrared temperature sensor; 21. and (5) disassembling the push rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-5, an embodiment of the present invention is shown: a precise constant temperature control device for buildings comprises a mounting and fixing part 1, an upper connecting part 4 is installed at the upper end of the mounting and fixing part 1, a control box 11 is installed at the lower end inside the upper connecting part 4, a mounting boss 7 is installed at the upper end of the control box 11, an indoor top heat-conducting plate 6 is installed at the upper end of the upper connecting part 4, an indoor bottom infrared temperature sensor 9 is installed at the upper end of one side of the indoor top heat-conducting plate 6, the indoor bottom infrared temperature sensor 9 can detect the temperature of the indoor bottom, the indoor bottom infrared temperature sensor 9 is fixedly connected with the indoor top heat-conducting plate 6, an indoor top infrared temperature sensor 20 is installed at the upper end of the other side inside of the upper connecting part 4, the indoor top infrared temperature sensor 20 can detect the indoor top temperature, the indoor top infrared temperature sensor 20 is fixedly connected with the upper connecting part 4, a bottom fixing plate 17 is installed at the lower end inside the mounting and fixing part 1, the upper end of a bottom fixing plate 17 is provided with a driving screw rod 14, the driving screw rod 14 is connected with the bottom fixing plate 17 and an installation fixing part 1 through bearings, a movable installation plate 15 is installed outside the driving screw rod 14, building internal infrared temperature sensors 16 are installed on two sides of the movable installation plate 15, the building internal infrared temperature sensors 16 are installed to be matched with the driving screw rod 14 to accurately detect the temperatures of different positions in the building, so that the temperature change of the external environment is obtained, an external temperature control device of the device can deal with the temperature in advance, the dealing is avoided after the indoor temperature changes greatly, the usability of the device is improved, the indoor bottom infrared temperature sensor 9, the indoor top infrared temperature sensor 20 and the building internal infrared temperature sensor 16 are mutually cooperated to accurately detect the temperatures of different heights in the building and in the room, make the device can in time deal with the temperature variation that external environment changes and bring, make indoor temperature keep more stable, prevent that the indoor temperature from appearing changing by a wide margin, building inside infrared temperature sensor 16 and mobile mounting panel 15 fixed connection, contact spring 13 is all installed to the both sides of installation fixed part 1, installation contact spring 13 can promote building inside heat-conducting plate 2 and hug closely the building, increase the practicality of device, simultaneously, prevent that the device from rocking, play certain fixed effect, contact spring 13 and installation fixed part 1 fixed connection, contact spring 13 keeps away from the one end of installation fixed part 1 and installs building inside heat-conducting plate 2, building inside heat-conducting plate 2 and contact spring 13 fixed connection.

Further, garter spring 19 is installed to the inside lower extreme of installation fixed part 1, the removal push pedal 18 is installed to garter spring 19's upper end, chucking pole 3 is installed to the upper end of removing push pedal 18, chucking pole 3 passes through hinged joint with removal push pedal 18, the lower extreme of removing mounting panel 15 is installed and is dismantled push rod 21, thereby installation garter spring 19 can upwards promote to remove push pedal 18 with 3 ejecting device of chucking pole, realize the device auto-lock, prevent that the device from sliding, it is simple fast more to make the installation, the reduction device installation degree of difficulty, it is more convenient to make the device use, be favorable to increasing staff's work efficiency.

Further, the upper end of the control box 11 is provided with the irradiation atmosphere lamp 10, the irradiation atmosphere lamp 10 is fixedly connected with the control box 11, the irradiation atmosphere lamp 10 is installed to play a role in creating an atmosphere, the functionality of the device is increased, the device is functionalized, and the device is more attractive.

Further, high glass 8 that passes through is installed to the upper end of installation boss 7, and high glass 8 and installation boss 7 fixed connection that pass through, installation high glass 8 that passes through can make light can pass through the device, plays the spaced effect simultaneously, plays the effect of protection to irradiation atmosphere lamp 10.

Further, the damping sealing layer 5 is installed to the lower extreme of upper portion connecting portion 4, and damping sealing layer 5 is connected with upper portion connecting portion 4 cementing, and installation damping sealing layer 5 can increase the shock resistance of device, plays sealed effect simultaneously.

Further, a driving motor 12 is installed at the upper end inside the installation fixing part 1, the driving motor 12 is fixedly connected with the installation fixing part 1, the driving motor 12 is connected with a driving screw rod 14 through a coupler, a clamping spring 19 is welded with a movable push plate 18, the clamping spring 19 is provided with a plurality of parts, an upper connecting part 4 is fixedly connected with the installation fixing part 1, a control box 11 is fixedly connected with the upper connecting part 4, the upper connecting part 4 is fixedly connected with the control box 11, an indoor top heat conduction plate 6 is fixedly connected with the upper connecting part 4, a movable mounting plate 15 is slidably connected with the installation fixing part 1 through a clamping groove, the movable mounting plate 15 is connected with the driving screw rod 14 through a ball screw nut pair, the installation clamping spring 19 can upwards push the movable push plate 18 to push out the clamping rod 3, self-locking of the device is realized, the device is prevented from sliding, and the installation is quicker and simpler, the installation difficulty of the device is reduced, the device is more convenient to use, and the working efficiency of workers is increased.

A control method of a precise constant temperature control device for a building comprises the following steps:

the method comprises the following steps: the device is reversely buckled by a worker and installed indoors, the installation fixing part 1 is embedded into the top of a building, the shock absorption sealing layer 5 is tightly attached to the top of the building, the device moves downwards under the action of gravity, the clamping spring 19 can push the movable push plate 18 to move, the clamping rod 3 is pushed out of the device to be in contact with the building, the device is clamped, and self-locking of the device is achieved;

step two: the indoor bottom infrared temperature sensor 9 detects the temperature of the ground below the device, so that the device records the temperature of the indoor ground, the indoor top infrared temperature sensor 20 detects the temperature of the indoor top indoor heat-conducting plate 6 at the indoor top, so as to obtain the temperature of the indoor top, the building internal infrared temperature sensor 16 detects the temperature of the building internal heat-conducting plate 2 under the action of the driving screw rod 14, and the building internal heat-conducting plate 2 is in close contact with the building due to the fact that the contact spring 13 exerts a thrust force on the building internal heat-conducting plate 2, so that the building internal infrared temperature sensor 16 can detect the temperatures at different heights in the building;

step three: according to the difference in temperature and the temperature variation at both ends about the inside heat-conducting plate 2 of building, obtain external environment's change, reach the device season of locating, thereby make the device can carry out the control by temperature change to the change according to season and weather, when external environment appears undulant, the inside infrared temperature sensor 16 of building detects out temperature variation at first, then with data to the transmission of control box 11, control box 11 combines the indoor temperature that indoor bottom infrared temperature sensor 9 and indoor top infrared temperature sensor 20 gathered again, thereby make temperature control fast

The working principle is as follows: when the device is used, a worker reversely buckles the device to be installed indoors, the installation fixing part 1 is embedded into the top of a building, the damping sealing layer 5 is tightly attached to the top of the building, the device moves downwards under the action of gravity, the clamping spring 19 can push the movable push plate 18 to move, so that the clamping rod 3 is pushed out of the device to be in contact with the building, the device is clamped to realize self-locking of the device, the indoor bottom infrared temperature sensor 9 detects the temperature of the ground below the device, the device records the indoor ground temperature, the indoor top infrared temperature sensor 20 detects the temperature of the indoor top indoor heat-conducting plate 6 to obtain the indoor top temperature, the building infrared temperature sensor 16 detects the temperature of the building heat-conducting plate 2 under the action of the driving screw rod 14, and the contact spring 13 applies a pushing force to the building heat-conducting plate 2, the heat conducting plate 2 in the building is in close contact with the building, so that the infrared temperature sensor 16 in the building can detect the temperatures at different heights in the building, the change of the external environment is obtained according to the temperature difference and the temperature change at the upper end and the lower end of the heat conducting plate 2 in the building, the season of the device is obtained, the device can perform targeted temperature control according to the season and the weather, when the external environment fluctuates, the infrared temperature sensor 16 in the building firstly detects the temperature change, then data is transmitted to the control box 11, the control box 11 is combined with the indoor temperature collected by the infrared temperature sensor 9 at the indoor bottom and the infrared temperature sensor 20 at the indoor top to rapidly control the temperature, the infrared temperature sensor 9 at the indoor bottom can detect the temperature at the indoor bottom, the infrared temperature sensor 20 at the indoor top can detect the indoor temperature, the infrared temperature sensor 16 in the building is installed to be matched with the driving screw rod 14 to accurately detect the temperature of different positions in the building, so that the temperature change of the external environment is obtained, the external temperature control device of the device can respond in advance, the response is avoided after the indoor temperature is greatly changed, the usability of the device is improved, the infrared temperature sensor 9 at the indoor bottom, the infrared temperature sensor 20 at the indoor top and the infrared temperature sensor 16 in the building are mutually cooperated to rent so that the temperature of different heights in the building and the indoor can be accurately detected, the device can respond to the temperature change caused by the external environment change in time, the indoor temperature is kept more stable, the indoor temperature is prevented from being greatly changed, the heat conducting plate 2 in the building can be pushed to be attached to the building by installing the contact spring 13, the practicability of the device is improved, and meanwhile, the device is prevented from shaking, play certain fixed effect, thereby installation chucking spring 19 can upwards promote the removal push pedal 18 with chucking pole 3 ejecting device, realize the device auto-lock, prevent that the device from sliding, it is simple more fast to make the installation, reduce the device installation degree of difficulty, it is more convenient to make the device use, be favorable to increasing staff's work efficiency, the installation shines atmosphere lamp 10 and can play the effect of creating the atmosphere, increase the functionality of device, make the functional human nature of device, it is more pleasing to the eye to make the device simultaneously, installation high-transparent glass 8 can make light can pass through the device, play the partitioned effect simultaneously, play the effect of protection to shining atmosphere lamp 10, installation shock attenuation sealing layer 5 can increase the shock resistance of device, play sealed effect simultaneously.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.