Intelligent equipment with automatic distance adjusting and limiting functions for high-speed heavy-load train

文档序号:743262 发布日期:2021-04-23 浏览:25次 中文

阅读说明:本技术 一种具有自动调距限位功能的高速重载列车用智能设备 (Intelligent equipment with automatic distance adjusting and limiting functions for high-speed heavy-load train ) 是由 徐浩楠 于 2020-12-24 设计创作,主要内容包括:本发明公开了一种具有自动调距限位功能的高速重载列车用智能设备,包括基体、腔体、滑槽、限位板和圆柱拉伸弹簧,所述基体的内表面开设有腔体和滑槽,且腔体的内表面上端固定安装有U型件,所述滑槽的内表面固定安装有固定块和填充块,且滑槽的内表面滑动安装有基座,所述U型件的内表面固定安装有主轴,且主轴的外表面固定安装有移动块。该具有自动调距限位功能的高速重载列车用智能设备,设置带有自动调距的基座,通过基体内部安装的移动块带动主圆柱直齿轮进行前后移动,并且可带动单方向或者双方向的基座进行移动,方便进行调节基座之间的距离时,同样可通过主圆柱直齿轮的转动调节固定自驾车辆的压力块以及限位板的放置位置。(The invention discloses intelligent equipment with automatic distance adjusting and limiting functions for a high-speed heavy-load train, which comprises a base body, a cavity, a sliding groove, a limiting plate and a cylindrical extension spring, wherein the inner surface of the base body is provided with the cavity and the sliding groove, the upper end of the inner surface of the cavity is fixedly provided with a U-shaped piece, the inner surface of the sliding groove is fixedly provided with a fixed block and a filling block, the inner surface of the sliding groove is slidably provided with a base, the inner surface of the U-shaped piece is fixedly provided with a main shaft, and the outer surface of the main. This high-speed heavy load is smart machine for train with automatic roll adjustment limit function sets up the base that has automatic roll adjustment, and the movable block through base member internally mounted drives the main cylinder straight-teeth gear and carries out the back-and-forth movement to can drive the folk prescription and remove to or the base of both directions, when conveniently adjusting the distance between the base, the position of placing of pressure piece and the limiting plate of the fixed self-driving vehicle of rotation regulation of same accessible main cylinder straight-teeth gear.)

1. The utility model provides a high-speed heavy load is smart machine for train with automatic roll adjustment limit function, includes base member (1), cavity (2), spout (3), limiting plate (15) and cylinder extension spring (16), its characterized in that: the inner surface of the base body (1) is provided with a cavity (2) and a sliding chute (3), the upper end of the inner surface of the cavity (2) is fixedly provided with a U-shaped part (6), the inner surface of the sliding chute (3) is fixedly provided with a fixed block (4) and a filling block (5), the inner surface of the sliding chute (3) is slidably provided with a base (11), the inner surface of the U-shaped part (6) is fixedly provided with a main shaft (7), the outer surface of the main shaft (7) is fixedly provided with a movable block (8), the outer surface edge end of the main shaft (7) is fixedly provided with a belt (9), the inner surface of the belt (9) is fixedly provided with a lead screw (10), the outer surface of the lead screw (10) is in threaded connection with the base (11), the upper end of the outer surface of the base (11), and the internal surface fixed mounting of base (11) has cylindric lock (14), the external surface fixed mounting of cylindric lock (14) has limiting plate (15) to the external surface lower extreme fixed mounting of limiting plate (15) has cylinder extension spring (16).

2. The intelligent equipment with automatic distance-adjusting and limiting functions for the high-speed heavy-load train as claimed in claim 1, wherein: base member (1) constitutes mosaic structure through spout (3) and fixed block (4) and filling block (5), and the upper surface of fixed block (4) is less than the lower surface of filling block (5) to the upper surface of filling block (5) is laminated mutually with the lower surface of limiting plate (15).

3. The intelligent equipment with automatic distance-adjusting and limiting functions for the high-speed heavy-load train as claimed in claim 1, wherein: the U-shaped part (6) and the base body (1) form an embedded structure through the cavity (2), the U-shaped part (6) and the main shaft (7) form a rotating structure, and the main shaft (7) and the moving block (8) form a penetrating structure.

4. The intelligent equipment with automatic distance-adjusting and limiting functions for the high-speed heavy-load train as claimed in claim 1, wherein: the inner surface fixed mounting of movable block (8) has main cylinder straight-teeth gear (801), and the surface of movable block (8) inlays and installs telescopic link (802), and the surface flexible connection of telescopic link (802) has flexible chamber (803), and the surface meshing of main cylinder straight-teeth gear (801) is connected with time cylinder straight-teeth gear (804) simultaneously.

5. The intelligent equipment with automatic distance-adjusting and limiting functions for the high-speed heavy-load train as claimed in claim 4, wherein: the inner surface of the moving block (8) is attached to the edge of the outer surface of the main cylindrical straight gear (801), the moving block (8) and the telescopic cavity (803) form a telescopic structure through the telescopic rod (802), the moving block (8) and the telescopic rod (802) form an embedded structure, and meanwhile the outer surface of the moving block (8) is in a U-shaped structure.

6. The intelligent equipment with automatic distance-adjusting and limiting functions for the high-speed heavy-load train as claimed in claim 4, wherein: the main cylindrical spur gear (801) and the secondary cylindrical spur gear (804) form a meshing structure, the length of the outer surface of the secondary cylindrical spur gear (804) is smaller than that of the main cylindrical spur gear (801), and the shapes of the outer surface edge ends of the main cylindrical spur gear (801) and the secondary cylindrical spur gear (804) are arc-shaped structures.

7. The intelligent equipment with automatic distance-adjusting and limiting functions for the high-speed heavy-load train as claimed in claim 1, wherein: the lead screw (10) forms a rotating structure with the secondary cylinder straight gear (804) through the belt (9) and the main shaft (7), the lead screw (10) and the base (11) form a thread structure, the base (11) forms a nested structure with the rectangular block (13) through the positioning hole (12), and meanwhile the base (11) and the base body (1) form a sliding structure through the sliding groove (3).

8. The intelligent equipment with automatic distance-adjusting and limiting functions for the high-speed heavy-load train as claimed in claim 1, wherein: the outer surface upper end fixed mounting of base (11) has pressure piece (1101), and built-in groove (1102) have been seted up to the internal surface of pressure piece (1101), and the internal surface slidable mounting of built-in groove (1102) has stopper (1103), and the outer fixed surface of stopper (1103) installs base (11) simultaneously.

9. The intelligent equipment with automatic distance-adjusting and limiting functions for the high-speed heavy-load train according to claim 8 is characterized in that: pressure piece (1101) constitute sliding structure through built-in groove (1102) and stopper (1103), and stopper (1103) constitute mosaic structure with base (11), and base (11) constitute rotating-structure through cylindric lock (14) and limiting plate (15), limiting plate (15) set up 2 groups about the surface middle-end symmetry of base (11) simultaneously, and constitute elastic construction through cylinder extension spring (16) between 2 groups of limiting plate (15), the upper surface shape of limiting plate (15) and pressure piece (1101) is protruding trapezoidal shape structure simultaneously.

Technical Field

The invention relates to the technical field of intelligent equipment for a high-speed heavy-load train, in particular to intelligent equipment for the high-speed heavy-load train with an automatic distance adjusting and limiting function.

Background

The high-speed heavy-duty train generally refers to an ultra-long and overweight freight train which is formed by grouping large-sized special trucks on a transportation line with concentrated freight volume and running by traction of two or more trains, the high-speed heavy-duty train has large vehicle loading gravity and a large number of trains, wherein self-driving vehicles which can carry out self-driving trip return on some heavy-duty trains can be lightened, the self-driving vehicles can be quickly transported back to a residence, however, when the self-driving vehicles are transported, the self-driving vehicles need to be driven into the high-speed heavy-duty train box by professional personnel, but in order to prevent sudden braking of the high-speed heavy-duty train during operation, the driven vehicles need to be fixed to prevent the vehicles from moving in the train box and damaging the vehicles, but the existing limiting device for the high-speed heavy-duty train has defects when in use, wherein need manually fix it, manual fixed leads to the fact certain damage to self-driving vehicle tire easily, and lead to certain damage to the inside in high-speed heavy load train carriage, and at the in-process of traveling, if fixed locking force is not enough easily lead to the vehicle in the high-speed heavy load train to appear rocking the phenomenon in the transportation process, and lead to the self-driving car to bump in high-speed heavy load train carriage easily, all cause the damage to two sets of vehicles, and more vehicle is fixed the manual operation very slowly, delay loading efficiency.

Aiming at the problems, innovative design is urgently needed on the basis of the original high-speed heavy-load train structure.

Disclosure of Invention

The invention aims to provide intelligent equipment for a high-speed heavy-load train with an automatic distance adjusting and limiting function, and aims to solve the problems that the intelligent equipment needs to be manually fixed in the background art, tires of self-driving vehicles are easily damaged by manual fixing, the interior of a carriage of the high-speed heavy-load train is damaged to a certain extent, vehicles in the high-speed heavy-load train are easily shaken in the conveying process if the fixing locking force is insufficient in the running process, self-driving vehicles are easily collided in the carriage of the high-speed heavy-load train, two groups of vehicles are damaged, the manual fixing operation of more vehicles is very slow, and the loading efficiency is delayed.

In order to achieve the purpose, the invention provides the following technical scheme: an intelligent device with an automatic distance-adjusting and limiting function for a high-speed heavy-load train comprises a base body, a cavity, a sliding chute, a limiting plate and a cylindrical extension spring, wherein the cavity and the sliding chute are formed in the inner surface of the base body, a U-shaped piece is fixedly mounted at the upper end of the inner surface of the cavity, a fixed block and a filling block are fixedly mounted on the inner surface of the sliding chute, a base is slidably mounted on the inner surface of the sliding chute, a main shaft is fixedly mounted on the inner surface of the U-shaped piece, a moving block is fixedly mounted on the outer surface of the main shaft, a belt is fixedly mounted at the edge end of the outer surface of the main shaft, a lead screw is fixedly mounted on the inner surface of the belt, a base is in threaded connection with the outer surface of the lead screw, a positioning hole is fixedly, and the lower end of the outer surface of the limiting plate is fixedly provided with a cylindrical extension spring.

Preferably, the base body, the fixing block and the filling block form an embedded structure through the sliding groove, the upper surface of the fixing block is lower than the lower surface of the filling block, the filling block is preferably selected, the U-shaped piece and the base body form the embedded structure through the cavity, the U-shaped piece and the main shaft form a rotating structure, and the main shaft and the moving block form a penetrating structure.

Preferably, the inner surface of the moving block is fixedly provided with a main cylindrical straight gear, the outer surface of the moving block is embedded with a telescopic rod, the outer surface of the telescopic rod is telescopically connected with a telescopic cavity, and the outer surface of the main cylindrical straight gear is meshed with a secondary cylindrical straight gear.

Preferably, the inner surface of the moving block is attached to the edge of the outer surface of the main cylindrical straight gear, the moving block and the telescopic cavity form a telescopic structure through the telescopic rod, the moving block and the telescopic rod form an embedded structure, and the outer surface of the moving block is in a U-shaped structure.

Preferably, the main cylindrical spur gear and the secondary cylindrical spur gear form a meshing structure, the length of the outer surface of the secondary cylindrical spur gear is smaller than that of the main cylindrical spur gear, and the shapes of the outer surface edges of the main cylindrical spur gear and the secondary cylindrical spur gear are arc-shaped structures.

Preferably, the lead screw passes through the belt and the main shaft constitutes rotating-structure with the secondary cylinder spur gear, and lead screw and base constitution helicitic texture to the base passes through the locating hole and constitutes nested structure with the rectangular block, and the base passes through the spout simultaneously and constitutes sliding construction with the base member.

Preferably, the upper end of the outer surface of the base is fixedly provided with a pressure block, the inner surface of the pressure block is provided with a built-in groove, the inner surface of the built-in groove is slidably provided with a limiting block, and the outer surface of the limiting block is fixedly provided with the base.

Preferably, the pressure piece constitutes sliding structure through built-in groove and stopper, and stopper and base constitution mosaic structure to the base passes through the cylindric lock and constitutes revolution mechanic with the limiting plate, and the limiting plate sets up 2 groups about the surface middle-end symmetry of base simultaneously, and constitutes elastic construction through cylindrical extension spring between 2 groups of limiting plates, and the upper surface shape of limiting plate and pressure piece is protruding trapezoidal shape structure simultaneously.

Compared with the prior art, the invention has the beneficial effects that: the intelligent equipment for the high-speed heavy-load train with the automatic distance adjusting and limiting functions;

1. the high-speed heavy-load train with intelligent limiting and distance adjusting functions is arranged, when in use, different groups of base bodies can be installed according to the size of the interior of a carriage of the high-speed heavy-load train and the number of vehicles capable of being carried, and through the limiting structure arranged on the base bodies, the distance between the limiting device and the high-speed heavy-load train carriage can be automatically adjusted after the train drives into the carriage of the high-speed heavy-load train, and the limit device at one end is fixed in the distance adjusting process, so that the space of the subsequent vehicle is convenient to use sufficiently, the collision is avoided, the running-in self-driving vehicle is prevented from sliding, the pressure block and the limit plate which are arranged on the base body are both provided with a protruding trapezoidal block to prevent the self-driving vehicle from sliding in the transportation process, the self-driving vehicle can be more stably fixed through the two groups of limiting plates which are symmetrically arranged in the device;

2. the setting has the base of automatic roll adjustment, the movable block through base member internally mounted drives the main cylinder straight-teeth gear and carries out the back-and-forth movement, and can drive the folk prescription and remove to the base of perhaps equidirectional, when conveniently adjusting the distance between the base, the position of placing of the pressure block of the fixed self-driving vehicle of rotation regulation of same accessible main cylinder straight-teeth gear and limiting plate, usage space in the multiplicable railway carriage, also reducible manual operation, and can improve the stability when the volume of the car transports through device automatic fixation.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic perspective view of a base plate according to the present invention;

FIG. 3 is a schematic perspective view of a base according to the present invention;

FIG. 4 is a schematic perspective view of a movable block according to the present invention;

FIG. 5 is a schematic view of a semi-sectional perspective view of the base of the present invention;

FIG. 6 is a schematic diagram of a semi-sectional perspective structure of a pressure block according to the present invention;

fig. 7 is a schematic diagram of the exploded perspective structure of the present invention.

In the figure: 1. a substrate; 2. a cavity; 3. a chute; 4. a fixed block; 5. filling blocks; 6. a U-shaped member; 7. a main shaft; 8. a moving block; 801. a main cylindrical spur gear; 802. a telescopic rod; 803. a telescoping chamber; 804. a secondary spur gear; 9. a belt; 10. a lead screw; 11. a base; 1101. a pressure block; 1102. a built-in groove; 1103. a limiting block; 12. positioning holes; 13. a rectangular block; 14. a cylindrical pin; 15. a limiting plate; 16. a cylindrical extension spring.

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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, the present invention provides a technical solution: an intelligent device with an automatic distance-adjusting and limiting function for a high-speed heavy-load train comprises a base body 1, a cavity 2, a sliding groove 3, a fixed block 4, a filling block 5, a U-shaped part 6, a main shaft 7, a moving block 8, a main cylindrical spur gear 801, a telescopic rod 802, a telescopic cavity 803, a secondary cylindrical spur gear 804, a belt 9, a lead screw 10, a base 11, a pressure block 1101, an internal groove 1102, a limiting block 1103, a positioning hole 12, a rectangular block 13, a cylindrical pin 14, a limiting plate 15 and a cylindrical tension spring 16, wherein the cavity 2 and the sliding groove 3 are formed in the inner surface of the base body 1, the U-shaped part 6 is fixedly installed at the upper end of the inner surface of the cavity 2, the fixed block 4 and the filling block 5 are fixedly installed on the inner surface of the sliding groove 3, the base 11 is slidably installed on the inner surface of the U-shaped part 6, the main shaft 7 is, and the internal fixed surface of belt 9 installs lead screw 10 to the surface threaded connection of lead screw 10 has base 11, and the fixed locating hole 12 that has seted up in the surface upper end of base 11, and the internal fixed surface of locating hole 12 installs rectangular block 13, and the internal fixed surface of base 11 installs cylindric lock 14, and the external fixed surface of cylindric lock 14 installs limiting plate 15, and the external lower extreme fixed mounting of limiting plate 15 has cylindrical extension spring 16.

Base member 1 passes through spout 3 and fixed block 4 and filling block 5 constitution mosaic structure, and the upper surface of fixed block 4 is less than the lower surface of filling block 5, and the upper surface of filling block 5 and limiting plate 15's lower surface laminate mutually, mosaic structure through base member 1 and fixed block 4 and filling block 5, the phenomenon of splitting takes place during the prevention of use, and the upper surface of fixed block 4 is less than the lower surface of filling block 5, make things convenient for the removal of base 11, and the upper surface of filling block 5 and limiting plate 15's lower surface laminate mutually, can prevent that the device from taking place the perk when using.

U type spare 6 passes through cavity 2 and base member 1 constitution mosaic structure, and U type spare 6 constitutes revolution mechanic with main shaft 7, and main shaft 7 constitutes the structure of running through with movable block 8, through the mosaic structure of U type spare 6 with base member 1, fix the use to devices such as main shaft 7, prevent the phenomenon of breaking, and the revolution mechanic of U type spare 6 with main shaft 7, conveniently drive other parts and fix a position the rotation, prevent that the position from taking place the skew, and the structure of running through of main shaft 7 and movable block 8, prevent that the movable block 8 from removing the in-process card shell condition.

The internal fixed surface of movable block 8 installs main cylinder straight-teeth gear 801, and the surface of movable block 8 inlays and installs telescopic link 802, and the surface telescopic connection of telescopic link 802 has flexible chamber 803, and the surface meshing of main cylinder straight-teeth gear 801 is connected with time cylinder straight-teeth gear 804 simultaneously, and through the device of above-mentioned installation, can effectual regulation different groups of other device when using remove, also can carry out simultaneous movement, convenient effectual work of carrying on with two sets of stop device in the use.

The internal surface of movable block 8 and the laminating of the outer surface limit end of main cylinder straight-teeth gear 801, and movable block 8 passes through telescopic link 802 and flexible chamber 803 constitution extending structure, and movable block 8 and telescopic link 802 constitute mosaic structure, the surface shape of movable block 8 is "U" style of calligraphy structure simultaneously, the internal surface through movable block 8 and the laminating of the outer surface limit end of main cylinder straight-teeth gear 801, and the extending structure of movable block 8 and flexible chamber 803, make things convenient for movable block 8 to remove main cylinder straight-teeth gear 801, and the mosaic structure of movable block 8 and telescopic link 802, avoid taking place the fracture and lead to the device to damage, the surface shape of movable block 8 is "U" style of calligraphy structure simultaneously, avoid movable block 8 and the outer surface of main cylinder straight-teeth gear 801 to take place the contact.

The main cylindrical spur gear 801 and the secondary cylindrical spur gear 804 form a meshing structure, the outer surface length of the secondary cylindrical spur gear 804 is smaller than that of the main cylindrical spur gear 801, the outer surface edge end shapes of the main cylindrical spur gear 801 and the secondary cylindrical spur gear 804 are arc-shaped structures, through the meshing structure of the main cylindrical spur gear 801 and the secondary cylindrical spur gear 804, a limiting device connected with the secondary cylindrical spur gear 804 can be driven to move, the outer surface length of the secondary cylindrical spur gear 804 is smaller than that of the main cylindrical spur gear 801, the main cylindrical spur gear 801 can be moved to move unilaterally to the limiting device, the outer surface edge end shapes of the main cylindrical spur gear 801 and the secondary cylindrical spur gear 804 are arc-shaped structures, and meshing connection is convenient to carry out when in use.

Lead screw 10 passes through belt 9 and main shaft 7 and constitutes revolution mechanic with time cylinder straight-tooth gear 804, and lead screw 10 constitutes helicitic texture with base 11, and base 11 passes through locating hole 12 and rectangular block 13 constitutes nested structure, base 11 passes through spout 3 and base body 1 simultaneously and constitutes sliding construction, revolution mechanic through lead screw 10 and time cylinder straight-tooth gear 804, and the helicitic texture of lead screw 10 and base 11, can effectual regulation base 11's position, and base 11 and rectangular block 13's nested structure, prevent that the surface thickness of device is thinner to cause the damage, increase the support performance of device, base 11 and base body 1's sliding construction simultaneously, conveniently adjust stop device's position.

The outer surface upper end fixed mounting of base 11 has pressure piece 1101, and the internal surface of pressure piece 1101 has seted up built-in groove 1102 to the internal surface slidable mounting of built-in groove 1102 has stopper 1103, and the outer fixed surface of stopper 1103 installs base 11 simultaneously, through the installation of above-mentioned device, can prevent stop device's slippage when using, avoids causing the damage to the device to and cooperate the use with other devices.

The pressure block 1101 and the limiting block 1103 form a sliding structure, the limiting block 1103 and the base 11 form an embedded structure, the base 11 and the limiting plate 15 form a rotating structure through the cylindrical pin 14, meanwhile, the limiting plates 15 are symmetrically arranged in 2 groups relative to the middle end of the outer surface of the base 11, the 2 groups of limiting plates 15 form an elastic structure through the cylindrical tension spring 16, the upper surfaces of the limiting plate 15 and the pressure block 1101 are in a convex ladder-shaped structure, the limiting plate 15 is convenient to slide downwards to press the limiting plate 15 through the sliding structure of the pressure block 1101 and the limiting block 1103, the embedding structure of the limiting block 1103 and the base 11 prevents the pressure block 1101 from slipping when not in use, the rotating structure of the base 11 and the limiting plate 15 can effectively fix a vehicle, meanwhile, the limiting plates 15 are symmetrically arranged in 2 groups relative to the middle end of the outer surface of the base 11, both ends can be fixed to avoid the slipping, and 2 elastic construction through cylindrical extension spring 16 between group's limiting plate 15 can carry out quick recovery when not using, and limiting plate 15 and pressure block 1101's upper surface shape are protruding trapezoidal shape structure simultaneously, play the antiskid effect, avoid the vehicle to take place to sideslip to and make things convenient for the vehicle to roll off stop device's when using fixed.

The working principle is as follows: when the intelligent device with the automatic distance-adjusting and limiting functions for the high-speed heavy-duty train is used, according to the figures 1-7, the device is firstly placed at a position needing to work, when a vehicle needs to be fixedly loaded, a professional drives the vehicle to run in a carriage of the high-speed heavy-duty train, through the intelligent limiting device arranged in the carriage, a signal contactor arranged in the vehicle is triggered after the vehicle runs in, a motor arranged in a cavity 2 arranged in a base body 1 is started to run, a main cylindrical spur gear 801 arranged on a main shaft 7 connected with a U-shaped piece 6 is driven to rotate in the running process, a moving block 8 connected with a telescopic rod 802 is driven to move through a telescopic cavity 803 before the rotation, the moving block 8 drives the main cylindrical spur gear 801 to move and to rotate in a contact manner with a secondary cylindrical gear 804 in a single direction, a lead screw 10 connected with one end of a main shaft 7 and a belt 9 drives a base 11 to move, a pressure block 1101 used for limiting and arranged on the base 11 and a limiting plate 15 are fixed through extrusion support of a filling block 5 at the moment, rotation is avoided, then the device is driven in, the group of limiting devices are moved to the other end of a sliding chute 3 through operation of the device, the base 11 is supported through a fixing block 4, then when a signal contactor contacts with a wheel for the second time, a main cylindrical spur gear 801 is moved through a moving block 8, two groups of secondary cylindrical spur gears 804 are driven to rotate until front and rear wheels simultaneously contact with the pressure block 1101, the pressure block 1101 is driven to be pressed downwards, the pressure block 1101 is simultaneously pressed downwards, the damage to the pressure block 1101 is reduced through sliding of an internal groove 1102 and a limiting block 1103 and closing of a locating hole 12 and a rectangular block 13, and meanwhile, the limiting plate 15 rotates through a cylindrical pin 14, laminate with the wheel, avoid please take place to sideslip or with the removal, simultaneously when the vehicle uninstallation, limiting plate 15 will reset fast through the cylinder extension spring 16 of bottom installation, can use next time, has increased holistic practicality.

Those not described in detail in this specification are within the skill of the art.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

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