阅读说明：本技术 一种自动化产线上治具支撑及旋转装置 (Automatic it supports and rotary device to change tool on production line ) 是由 宾兴 陈开献 黄宗运 李太松 于 2019-09-17 设计创作，主要内容包括：本发明公开了一种自动化产线上治具支撑及旋转装置,包括平台支座、驱动组件及旋转组件,其中,上述平台支座设置于自动化产线的送料拉体的侧部；上述驱动组件设置在平台支座的侧部,旋转组件连接在驱动组件上,驱动组件给旋转组件向上的驱动力时,旋转组件的同步轮具有向上运动的趋势,并向上张紧啮合连接在同步轮上方的同步带,同步带的反作用力使同步轮旋转运动,以便驱动旋转组件上方的治具的一端绕另一端旋转运动；上述治具的另一端可转动地连接于旋转组件上。本发明通过齿传动方式提供驱动力,通过同步轮及同步带啮合可活动式结构将直线运动转化为旋转运动,实现治具自动稳定旋转。(The invention discloses a jig supporting and rotating device on an automatic production line, which comprises a platform support, a driving assembly and a rotating assembly, wherein the platform support is arranged on the side part of a feeding pulling body of the automatic production line; the driving assembly is arranged on the side part of the platform support, the rotating assembly is connected to the driving assembly, when the driving assembly supplies upward driving force to the rotating assembly, a synchronous wheel of the rotating assembly has a tendency of moving upwards and is tensioned upwards to be meshed with a synchronous belt connected above the synchronous wheel, and the synchronous wheel is rotated by the reaction force of the synchronous belt so as to drive one end of a jig above the rotating assembly to rotate around the other end; the other end of the jig is rotatably connected to the rotating assembly. The automatic fixture is driven by a tooth transmission mode, linear motion is converted into rotary motion by a movable structure meshed by a synchronous wheel and a synchronous belt, and the automatic and stable rotation of the fixture is realized.)

1. The utility model provides an automatic change tool supports and rotary device on production line which characterized in that: the automatic feeding device comprises a platform support (42), a driving assembly and a rotating assembly, wherein the platform support (42) is arranged on the side part of a feeding pulling body of an automatic production line; the driving assembly is arranged on the side part of the platform support (42), the rotating assembly is connected to the driving assembly, when the driving assembly supplies upward driving force to the rotating assembly, a synchronous wheel of the rotating assembly has a tendency of moving upwards and is tensioned upwards to be meshed with a synchronous belt connected above the synchronous wheel, and the reaction force of the synchronous belt enables the synchronous wheel to rotate so as to drive one end of a jig (5) above the rotating assembly to rotate around the other end; the other end of the jig (5) is rotatably connected to the rotating component.

2. The apparatus as claimed in claim 1, wherein the apparatus comprises: the driving assembly comprises a platform motor (43), a gear (44) and a rack (45), wherein the platform motor (43) is arranged on the side part of the platform support (42), and the gear (44) is connected to the output end of the platform motor (43) and is driven by the platform motor (43) to rotate; the rack (45) is vertically arranged on one side of the platform support (42) and is connected with the platform support (42) in a sliding manner along the vertical direction, the rack (45) is meshed with the gear (44), and when the gear (44) rotates, the rack (45) is driven to move up and down; the other side of the platform support (42) is connected with a lifting seat in a sliding way along the vertical direction.

3. The apparatus as claimed in claim 2, wherein the apparatus comprises: the rotating assembly comprises two synchronous belts (46), two synchronous wheels (47), a rotating spring (48), a straight rail (49), a clamping seat (410) and a connecting plate (411), wherein the two synchronous wheels (47) are respectively and rotatably connected to the rack (44) and the side wall of the lifting seat; straight rails (49) are respectively vertically arranged below the two synchronizing wheels (47); the two synchronous belts (46) are respectively arranged above the two synchronous wheels (47) and are meshed with the synchronous wheels (47).

4. The apparatus as claimed in claim 3, wherein the apparatus comprises: the two clamping seats (410) are respectively embedded on the two straight rails (49) in a sliding manner, one end of the synchronous belt (46) extends into the clamping seats (410) and is clamped and fixed by the clamping seats (410); the connecting plate (411) is connected to the two clamping seats (410); the two rotary springs (48) comprise two, one ends of the two rotary springs (48) are respectively connected with the other end of the synchronous belt (46), and the other ends of the two rotary springs (48) are respectively connected to the rack (44) and the lifting seat; so that one end of the timing belt (46) slides along the straight rail (49) through the clamping seat (410) to maintain the movable state.

5. The apparatus as claimed in claim 4, wherein the apparatus comprises: a rotating shaft of the synchronizing wheel (47) is fixedly connected with a connecting sleeve arranged at the bottom of the jig (5); in a natural state, the rotating spring (48) pulls the synchronous belt (46) downwards, the synchronous belt (46) pulls the synchronous wheel (47) to drive the jig (5) to be horizontally pressed on the feeding pulling body; when the rack (45) drives the synchronous wheel (47) to move upwards, the synchronous wheel (47) is tensioned and pulls up the synchronous belt (46), the reaction force of the synchronous belt (46) drives the synchronous wheel (47) to drive the jig (5) to rotate, and meanwhile, the clamping seat (410) pulls the synchronous belt (46) to descend along the straight rail (49).

6. The utility model provides an automatic change tool supports and rotary device on production line which characterized in that: the automatic feeding device comprises a platform fixing seat (412), a driving assembly and a rotating assembly, wherein the platform fixing seat (412) is arranged on the side part of a feeding pulling body of an automatic production line; the driving assembly is arranged on the side part of the platform fixing seat (412), the rotating assembly is connected to the driving assembly, when the driving assembly supplies upward driving force to the rotating assembly, a synchronizing wheel of the rotating assembly has an upward movement trend, and is upwards tensioned and meshed with a synchronous belt connected above the synchronizing wheel, the synchronous wheel rotates under the action of the reaction force of the synchronous belt, a shifting lever connected to the synchronizing wheel is driven to rotate when the synchronizing wheel rotates, and the shifting lever pushes up a jig (5) positioned above the rotating assembly from one end to rotate; the other end of the jig (5) is supported by the rotating component and freely rotates on the rotating component.

7. The apparatus as claimed in claim 6, wherein the apparatus comprises: the driving assembly comprises a platform sliding seat (413), a platform motor (43), a gear (44) and a rack (45), wherein the platform sliding seat (413) is connected to the side part of the platform fixing seat (412) in a sliding manner along the vertical direction; the platform motor (43) is arranged on the side part of the platform fixing seat (412), and the gear (44) is connected to the output end of the platform motor (43) and is driven by the platform motor (43) to rotate; the rack (45) is vertically arranged on one side of the platform sliding seat (413) and is meshed with the gear (44), and when the gear (44) rotates, the rack (45) is driven to drive the platform sliding seat (413) to move up and down.

8. The apparatus as claimed in claim 7, wherein the apparatus comprises: the rotating assembly comprises a synchronous belt (46), synchronous wheels (47), a rotating spring (48), a straight rail (49), a clamping seat (410), a shifting rod (415) and a supporting component, wherein the synchronous wheels (47) comprise two synchronous wheels, and the two synchronous wheels (47) are respectively and rotatably connected to two sides of the platform sliding seat (413); straight rails (49) are respectively vertically arranged below the two synchronizing wheels (47); the two synchronous belts (46) are respectively arranged above the two synchronous wheels (47) and are meshed with the synchronous wheels (47).

9. The apparatus as claimed in claim 8, wherein the apparatus comprises: the two clamping seats (410) are respectively embedded on the two straight rails (49) in a sliding manner, and one end of the synchronous belt (46) extends into the clamping seats (410) and is clamped and fixed by the clamping seats (410); the two rotary springs (48) comprise two, one ends of the two rotary springs (48) are respectively connected with the other end of the synchronous belt (46), and the other ends of the two rotary springs (48) are respectively connected to the platform sliding seat (413); a fixed sleeve (414) is sleeved and fixed on the rotating shaft of the synchronizing wheel (47); one end of the poking rod (415) is connected with the fixed sleeve (414), and the other end is rotatably provided with a poking wheel (419); the supporting component is arranged between the platform sliding seat (413) and the jig (5) so as to support the jig (5); in a natural state, the rotating spring (48) pulls the synchronous belt (46) downwards, the synchronous belt (46) pulls the synchronous wheel (47) to drive the jig (5) to horizontally press the feeding pulling body downwards; when the rack (45) drives the platform sliding seat (413) and the synchronizing wheel (47) to move upwards, the synchronizing wheel (47) is tensioned and pulls up the synchronizing belt (46), the synchronizing wheel (47) is driven to rotate by the reaction force of the synchronizing belt (46), the synchronizing wheel (47) drives the shifting wheel (419) at the other end of the shifting rod (415) to jack up the jig (5) upwards, and meanwhile, the clamping seat (410) pulls the synchronizing belt (46) to descend along the straight rail (49).

10. The apparatus as claimed in claim 9, wherein the apparatus comprises: the supporting component comprises two supporting seats (416), supporting shafts (417) and supporting wheels (418), wherein the two supporting seats (416) are respectively connected to the upper part of the platform sliding seat (413), and the supporting seats (416) are provided with supporting grooves with open tops; the support shafts (417) comprise two, and the two support shafts (417) are respectively arranged at two sides of the bottom of the jig (5); the supporting wheel (418) is connected to the supporting shaft (417); when the jig (5) is in a horizontal state, the supporting shaft (417) and the supporting wheel (418) are respectively and rotatably embedded into the supporting groove, when the jig (5) rotates, the supporting shaft (417) and the supporting wheel (418) rotate in the supporting groove so as to support the limiting jig (5), a magnet (420) is further arranged below the jig (5), when the jig (5) is in a horizontal state, the magnet (420) and the jig (5) are arranged at intervals, and when the jig (5) rotates, the bottom of the jig (5) gradually clings to the magnet (420) and is adsorbed and positioned by the magnet (420).

Technical Field

The invention relates to the field of automation, in particular to a jig supporting and rotating device on an automatic production line.

Background

Computer, Communication and Consumer electronics Electronic 3C industries, which are information appliance industries integrated and applied by combining three high-tech products of Computer, Communication and Consumer electronics. 3C appeared in the later 90 s, due to the development of semiconductors and the popularization of Internet, the 3C industry, which combines the fields of computer, communication and consumer electronics, has taken the way to the digital era, and has gradually developed into a new technology industry worldwide. The 3C industry covers a wide range, the computer aspect includes notebook computers, various computer hardware and various peripheral devices, the communication aspect includes wireless communication devices, user terminal devices, switching devices and transmission devices, in recent years, the mobile phone and telecommunication industry are taken as the main axis, consumer electronics includes digital cameras, PDAs, electronic dictionaries, personal digital assistants …, and various digital commodities, all belong to consumer electronics commodities, the 3C industry has the characteristics of short life cycle, continuous reduction of cost and flexibility, global operations, and the like, the 3C industry takes the foot of the digital age, gradually develops into a worldwide new technology industry, and is an industry which is developed most rapidly and frequently at present. The term 3C is a new term that appears with the advancement of semiconductor technology, particularly single-chip Systems (SOC), and is regarded as the mainstream of Post-PC Era, and trends toward low price, mass production, low cost, high integration, and importance on personalization and diversification. With the rapid expansion of intelligent terminal equipment and the like in the consumption market in recent years, the market demand scale is increased year by year, and enterprises in the 3C industry and upstream and downstream of the industry chain thereof have more orders and development opportunities.

The production process of the 3C product relates to the assembly process of various spare and accessory parts, the actions of assembling and dispensing accessories on a PCB (printed circuit board), or the actions of assembling and buckling a product shell; because the components are various in types and different in structural size, shape and the like, different assembly and processing technologies in the actual assembly process often have different requirements on the angle of the product; the product is generally clamped and fixed by a jig and then is conveyed to each assembly processing station along the feeding pulling body in a straight line; the existing jig generally adopts a horizontal fixed installation mode, namely the jig is horizontally placed on a feeding pulling body after clamping a product, and cannot rotate to adjust the angle of the product due to movement interference; based on the situation, a device for bearing and supporting the jig, overcoming the motion interference to realize the rotation of the jig and realizing the angular rotation adjustment function of the product is needed to be designed.

Disclosure of Invention

The present invention provides a supporting and rotating device for a jig on an automatic production line, which provides a driving force by a tooth transmission manner, and converts a linear motion into a rotational motion by a movable structure engaged by a synchronizing wheel and a synchronizing belt, so as to realize an automatic and stable rotation of the jig.

The technical scheme adopted by the invention is as follows: a jig supporting and rotating device on an automatic production line comprises a platform support, a driving assembly and a rotating assembly, wherein the platform support is arranged on the side part of a feeding pulling body of the automatic production line; the driving assembly is arranged on the side part of the platform support, the rotating assembly is connected to the driving assembly, when the driving assembly supplies upward driving force to the rotating assembly, a synchronous wheel of the rotating assembly has a tendency of moving upwards and is tensioned upwards to be meshed with a synchronous belt connected above the synchronous wheel, and the synchronous wheel is rotated by the reaction force of the synchronous belt so as to drive one end of a jig above the rotating assembly to rotate around the other end; the other end of the jig is rotatably connected to the rotating assembly.

Preferably, the driving assembly comprises a platform motor, a gear and a rack, wherein the platform motor is arranged on the side part of the platform support, and the gear is connected to the output end of the platform motor and is driven by the platform motor to rotate; the rack is vertically arranged on one side of the platform support and is connected with the platform support in a sliding manner along the vertical direction, the rack is meshed with the gear, and when the gear rotates, the rack is driven to move up and down; the other side of the platform support is connected with a lifting seat in a sliding way along the vertical direction.

Preferably, the rotating assembly comprises two synchronous wheels, a rotating spring, a straight rail, a clamping seat and a connecting plate, wherein the two synchronous wheels are respectively and rotatably connected to the side walls of the rack and the lifting seat; straight rails are respectively vertically arranged below the two synchronous wheels; the two synchronous belts are respectively arranged above the two synchronous wheels and are meshed and connected with the synchronous wheels.

Preferably, the two clamping seats are respectively embedded on the two straight rails in a sliding manner, and one end of the synchronous belt extends into the clamping seats and is clamped and fixed through clamping; the connecting plate is connected to the two clamping seats; the two rotary springs comprise two pieces, one ends of the two rotary springs are respectively connected with the other end of the synchronous belt, and the other ends of the two rotary springs are respectively connected to the rack and the lifting seat; so that one end of the synchronous belt slides along the straight rail through the clamping seat to maintain a movable state.

Preferably, a rotating shaft of the synchronizing wheel is fixedly connected with a connecting sleeve arranged at the bottom of the jig; in a natural state, the rotating spring pulls the synchronous belt downwards, and the synchronous belt pulls the synchronous belt to drive the jig to be horizontally pressed on the feeding pulling body; when the rack drives the synchronizing wheel to move upwards, the synchronizing wheel is tensioned and pulls up the synchronous belt, the reaction force of the synchronous belt drives the synchronizing wheel to drive the jig to rotate, and meanwhile, the clamping seat pulls the synchronous belt to descend along the straight rail.

A jig supporting and rotating device on an automatic production line comprises a platform fixing seat, a driving assembly and a rotating assembly, wherein the platform support is arranged on the side part of a feeding pulling body of the automatic production line; the driving assembly is arranged on the side part of the platform support, the rotating assembly is connected to the driving assembly, when the driving assembly supplies upward driving force to the rotating assembly, a synchronizing wheel of the rotating assembly has an upward movement trend, and is upwards tensioned and meshed with a synchronous belt connected above the synchronizing wheel, the synchronous wheel rotates under the action of the reaction force of the synchronous belt, a shifting lever connected to the synchronizing wheel is driven to rotate when the synchronizing wheel rotates, and the shifting lever pushes up a jig above the rotating assembly from one end to rotate; the other end of the jig is supported by the rotating assembly and freely rotates on the rotating assembly.

Preferably, the driving assembly comprises a platform sliding seat, a platform motor, a gear and a rack, wherein the platform sliding seat is connected to the side part of the platform fixing seat in a sliding manner along the vertical direction; the platform motor is arranged on the side part of the platform fixing seat, and the gear is connected to the output end of the platform motor and is driven by the platform motor to rotate; the rack is vertically arranged on one side of the platform sliding seat and is meshed with the gear, and when the gear rotates, the rack is driven to drive the platform sliding seat to move up and down.

Preferably, the rotating assembly comprises two synchronous wheels, a rotating spring, a straight rail, a clamping seat, a shifting rod and a supporting component, wherein the two synchronous wheels are respectively and rotatably connected to two sides of the platform sliding seat; straight rails are respectively vertically arranged below the two synchronous wheels; the two synchronous belts are respectively arranged above the two synchronous wheels and are meshed and connected with the synchronous wheels.

Preferably, the two clamping seats are respectively embedded on the two straight rails in a sliding manner, and one end of the synchronous belt extends into the clamping seats and is clamped and fixed by the clamping seats; the two rotary springs comprise two pieces, one ends of the two rotary springs are respectively connected with the other end of the synchronous belt, and the other ends of the two rotary springs are respectively connected to the platform sliding seat; a fixed sleeve is sleeved and fixed on the rotating shaft of the synchronizing wheel; one end of the shifting lever is connected to the fixing sleeve, and the other end of the shifting lever is rotatably provided with a shifting wheel; the supporting component is arranged between the platform sliding seat and the jig so as to support the jig; in a natural state, the rotating spring pulls the synchronous belt downwards, and the synchronous belt pulls the synchronous belt to drive the jig to horizontally press the feeding pulling body downwards; when the rack drives the platform sliding seat and the synchronous wheel to move upwards, the synchronous wheel is tensioned and pulls up the synchronous belt, the reaction force of the synchronous belt drives the synchronous wheel to rotate, the synchronous wheel drives the shifting wheel at the other end of the shifting rod to upwards jack up the jig, and meanwhile, the clamping seat pulls the synchronous belt to descend along the straight rail.

Preferably, the support member comprises two support seats, a support shaft and two support wheels, wherein the two support seats are respectively connected to the upper part of the platform sliding seat, and the support seats are provided with support grooves with open tops; the supporting shafts comprise two, and the two supporting shafts are respectively arranged on two sides of the bottom of the jig; the supporting wheel is connected to the supporting shaft; when the jig is in a horizontal state, the supporting shaft and the supporting wheels are respectively and rotatably embedded into the supporting grooves, and when the jig rotates, the supporting shaft and the supporting wheels rotate in the supporting grooves so as to support the limiting jig; the below of above-mentioned tool still is equipped with magnet, and when the tool was horizontal, magnet and tool interval set up, and when the tool was rotatory, its bottom was progressively hugged closely magnet, through the location of magnet absorption.

The invention has the beneficial effects that:

the invention designs a jig supporting and rotating device on an automatic production line, which provides driving force in a tooth transmission mode, converts linear motion into rotary motion by a movable structure meshed by a synchronous wheel and a synchronous belt, and realizes automatic and stable rotation of a jig. The automatic assembling device is arranged on one side of a feeding pulling body of an automatic assembling production line and positioned at an assembling and processing station, and has the function of pushing a jig which is fed into the assembling and processing station through the feeding pulling body to rotate so as to adjust the assembling angle of a product on the jig according to the actual processing requirement; the rack meshed and connected with the gear is driven to move up and down along the vertical direction when the gear rotates; when the rack ascends, the synchronous wheel is driven to move upwards, when the synchronous wheel ascends, the synchronous belt sleeved and pressed above the synchronous wheel is tensioned upwards by the synchronous wheel, the synchronous wheel rotates by the reaction force of the synchronous belt, and the rotating shaft of the synchronous wheel rotates along with the synchronous wheel; meanwhile, the jig or the shifting lever connected to the rotating shaft of the synchronizing wheel rotates along with the rotating shaft of the synchronizing wheel to directly adjust the angle or upwards push one end of the jig through the shifting lever to achieve the effect of jig rotation. Specifically, the present invention includes the following two embodiments:

the first embodiment adopts the supporting and rotating device to move synchronously with the jig, namely, the long side edge of the jig is fixedly connected with the rotating shaft of the synchronizing wheel through the connecting sleeve, and the rotating shaft of the synchronizing wheel rotates along with the synchronizing wheel and drives the jig to rotate around the long side edge while the synchronizing wheel rotates, so as to achieve the function of adjusting the angle of the jig; in the embodiment, the two sides of the platform support are respectively connected with the rack and the lifting seat in a sliding way along the vertical direction, and the rack and the gear are driven to move up and down along the vertical direction; meanwhile, the outer side walls of the rack and the lifting seat of the embodiment are respectively rotatably connected with a synchronous wheel, the upper part of the synchronous wheel is sleeved with a synchronous belt, one end of the synchronous belt is fixed on the rack and the lifting seat through a rotating spring, the other end of the synchronous belt is connected on a clamping seat, the clamping seat is slidably embedded on a straight rail vertically arranged on the rack and the lifting seat, the synchronous belt is kept in a movable state through the slidable structure of the clamping seat, the synchronous belt pulls down the synchronous wheel in a natural state through the pulling force provided by the rotating spring, so that the jig is kept in a horizontal state, and the jig can be conveniently linearly transmitted on a feeding pulling body; when the rack drives the synchronizing wheel to move upwards, the synchronizing wheel upwards supports and pushes the synchronous belt, the reaction force of the synchronous belt backwards pulls the synchronous wheel to rotate, and when the synchronous wheel rotates, the rotating shaft of the synchronous wheel is driven and the synchronous wheel is connected to the rotating shaft through the connecting sleeve to rotate a jig so as to adjust the angle of the jig.

The second embodiment of the invention adopts a platform fixing seat as a supporting structure, one side of the platform fixing seat is slidably provided with a platform sliding seat, the middle part of the platform sliding seat is provided with a through groove, a rack is arranged on the side wall of the platform sliding seat, the power of a motor is transmitted to the rack through a gear, and the rack is driven to drive the platform sliding seat to move up and down; the synchronous wheels are arranged on two sides of the platform sliding seat, and similarly, the synchronous belts are sleeved above the synchronous wheels and are meshed and connected with the synchronous wheels; one end of the synchronous belt is connected to the side wall of the platform sliding seat through a rotary spring, the other end of the synchronous belt is connected to the clamping seat, and the clamping seat is slidably embedded on the side wall of the platform sliding seat along the vertical direction so as to ensure the drawability of the synchronous belt; in addition, a rotating shaft of the synchronizing wheel is inserted into the through groove in the middle of the platform sliding seat in the embodiment, a fixing sleeve is sleeved on the rotating shaft, a shifting rod is fixedly connected on the fixing sleeve, one end of the shifting rod is fixed on the fixing sleeve, and the other end of the shifting rod extends to the position below the end part of the jig; the synchronous belt is pulled down by the rotating spring in a natural state, so that the synchronous belt pulls the synchronous wheel to rotate, and the synchronous wheel drives the other end of the shifting rod to retract downwards through the rotating shaft and the fixed sleeve of the synchronous wheel; when the synchronizing wheel moves upwards to push and pull the synchronous belt, the reaction force of the synchronous belt enables the synchronizing wheel to rotate, the synchronizing wheel drives the rotating shaft to rotate, so that the other end of the shifting rod upwards jacks up the jig from one side of the jig, and the jig rotates around the side edge of the other side. In addition, the other side of the jig is provided with a supporting component, a supporting seat of the supporting component is arranged at the upper part of the platform sliding seat, and the top of the supporting seat is provided with a supporting groove which is opened upwards; meanwhile, support shafts are arranged on two sides of the bottom of the jig, and support wheels are connected to the support shafts; when the jig drives the clamped product to move linearly on the feeding pulling body, the supporting shaft is kept in an idle state; when the jig moves to the supporting and rotating device of the invention and is positioned by the roller inserted downwards; the supporting seat moves upwards along with the platform sliding seat while driving the synchronizing wheel to move upwards, so that the supporting shaft and the supporting wheel are respectively embedded into the supporting grooves of the supporting seat, the synchronizing wheel drives the shifting rod to rotate, when the other end of the shifting rod pushes up one side of the jig, the supporting shaft arranged at the lower part of the other side of the jig is supported by the supporting seat and limited by the supporting grooves, so that the jig rotates around the supporting shaft to achieve the purpose of adjusting the angle of the jig; after the processing is finished, the synchronizing wheel and the supporting seat descend, so that the jig gradually returns to a horizontal placing position, and the jig is continuously and linearly transmitted to a next station through the feeding pulling body; the structure design avoids movement interference while realizing the rotation of the jig, and the transmission is simple and stable.

Drawings

Fig. 1 is a schematic perspective view of an embodiment 1 of the present invention.

Fig. 2 is a second schematic perspective view of embodiment 1 of the present invention.

Fig. 3 is a third schematic perspective view of the embodiment 1 of the present invention.

Fig. 4 is a schematic perspective view of embodiment 2 of the present invention.

Fig. 5 is a second schematic perspective view of embodiment 2 of the present invention.

Fig. 6 is a third schematic perspective view of an embodiment 2 of the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which: