阅读说明：本技术 一种塑胶球体生产线用产品传输机构 (Product conveying mechanism for plastic ball production line ) 是由 周叶青 于 2021-09-23 设计创作，主要内容包括：本发明公开了一种塑胶球体生产线用产品传输机构,底架的顶部正上方设置有输送组件,输送组件与底架之间设置有抬升组件,且输送组件的左端设置有收集组件,底架的右端设置有移动组件。输送组件用于对成型加工后的塑胶球体进行传输,同时输送组件的结构可以进行拆装,可以适应不同规格的塑胶球体,抬升组件可以对输送组件的一端进行抬升,使得整个传输机构可以适应不同高度的塑胶球体生产线,收集组件用于在塑胶球体传输后直接进行分类收集管理,不仅避免了人工收集导致的工作人员劳动强度的增加,同时可以避免塑胶球体堆过多导致球壁损伤,移动组件使得工作人员可以更加快捷和方便地移动整个装置。(The invention discloses a product conveying mechanism for a plastic sphere production line. Conveying assembly is used for transmitting the plastic spheroid after the contour machining, conveying assembly's structure can carry out the dismouting simultaneously, can adapt to the plastic spheroid of different specifications, the lifting subassembly can carry out the lifting to conveying assembly's one end, make whole transport mechanism can adapt to the plastic spheroid production line of co-altitude not, the collection subassembly is used for directly carrying out the categorised collection management after the plastic spheroid transmission, the increase of the staff intensity of labour who has not only avoided artifical collection to lead to, can avoid the plastic spheroid to pile too much simultaneously and lead to the ball wall damage, the removal subassembly makes the staff can more swiftly and conveniently remove whole device.)

1. The utility model provides a product transmission device for plastic ball production line, includes chassis (1), its characterized in that: be provided with conveyor assembly (2) directly over the top of chassis (1), be provided with lifting subassembly (3) between conveyor assembly (2) and chassis (1), just the left end of conveyor assembly (2) is provided with collects subassembly (4), the right-hand member of chassis (1) is provided with removal subassembly (5).

2. The product conveying mechanism for the plastic sphere production line as claimed in claim 1, wherein: conveyor components (2) include mounting panel (21), both ends are fixed with guard plate (211) around the top of mounting panel (21), it is connected with a pair of pivot (22) to rotate on guard plate (211), each all be fixed with a pair of sprocket (221) on pivot (22), control two pairs of transmission connection has chain (222), two on sprocket (221) the relative lateral wall of chain (222) is fixed with a plurality of installation pieces (231) that are the equidistant distribution, two corresponding it has link joint (23) to pass through the screw fixation on installation piece (231).

3. The product conveying mechanism for the plastic sphere production line as claimed in claim 2, wherein: the chain plate (23) is provided with a plurality of stabilizing holes (234), and the chain plate (23) is also fixed with a blocking plate (233).

4. The product conveying mechanism for the plastic sphere production line as claimed in claim 2, wherein: the lifting assembly (3) comprises a pair of support legs (31) fixed at the left end of the top of the bottom frame (1), two support legs (31) are rotatably connected with a rotating rod (311), a pair of supporting blocks (312) are fixed on the rotating rod (311), and the supporting blocks (312) are fixedly connected with the bottom wall of the mounting plate (21).

5. The product conveying mechanism for the plastic sphere production line as claimed in claim 1 or 4, wherein: lifting subassembly (3) are including being fixed in installing support (32) that chassis (1) top is close to intermediate position department, installing support (32) are the U shape of falling, install a pair of lead screw lift (33) on the roof of installing support (32), the lead screw part of lead screw lift (33) passes installing support (32), and connects through the universal driving shaft transmission between two lead screw lift (33), and driving motor (34) are installed to the one end of universal driving shaft, fixed connection between the output shaft of driving motor (34) and the universal driving shaft, the lead screw part top of lead screw lift (33) is fixed with top disc (331), rotate on top disc (331) and be connected with wheel carrier (332), be provided with gyro wheel (3321) in wheel carrier (332).

6. The product conveying mechanism for the plastic sphere production line as claimed in claim 1 or 5, wherein: the lifting assembly (3) further comprises a wheel groove (35) formed in the bottom of the mounting plate (21), and the upper half end of the roller (3321) is located in the wheel groove (35) and connected with the wheel groove (35) in a rolling mode.

7. The product conveying mechanism for the plastic sphere production line as claimed in claim 1, wherein: collecting element (4) is including being fixed in fixed plate (41) on mounting panel (21) left side wall, set up a plurality of fixed orificess that are equidistant distribution on fixed plate (41), closely bond in the fixed orifices and have collection fill (42), the lower extreme intercommunication that collects fill (42) has bulb (421) down, and collecting element (4) are still including placing collecting box (43) at chassis (1) top, it places the district to separate the multirow in collecting box (43), and every is placed and has been placed collecting vessel (431) in the district, every row collecting vessel (431) and bulb (421) one-to-one down.

8. The product conveying mechanism for the plastic sphere production line as claimed in claim 7, wherein: the collecting assembly (4) further comprises a pushing cylinder (44) arranged on the bottom frame (1), the end part of a piston rod of the pushing cylinder (44) is fixedly connected with the outer wall of the collecting box (43), and the collecting hoppers (42) are in one-to-one correspondence with the stabilizing holes (234).

9. The product conveying mechanism for the plastic sphere production line as claimed in claim 1, wherein: remove subassembly (5) including being fixed in removal wheel (41) of chassis (1) diapire four corners position and being fixed in a pair of installation piece (52) of chassis (1) right side wall, two it is connected with rotation connecting rod (53) to rotate on installation piece (52), be fixed with a pair of telescopic link (54) on the outer wall of rotation connecting rod (53), two the top of telescopic link (54) is connected with push rod (541).

10. The product conveying mechanism for the plastic sphere production line as claimed in claim 9, wherein: the two ends of the rotating connecting rod (53) are provided with external threads, the thread directions of the external threads at the two ends are opposite, the two ends of the rotating connecting rod (53) are in threaded connection with threaded sleeves (55), and force applying rods (551) are fixed on the outer walls of the threaded sleeves (55).

Technical Field

The invention belongs to the field of plastic ball production, and particularly relates to a product conveying mechanism for a plastic ball production line.

Background

The plastic ball is the spheroid of making with the plastic material, and most is used for children's toy or sport ball field, and in the spheroidal production process of plastic, owing to need a plurality of process steps, follow-up still need collect and place, so most use the conveyer belt to transmit, but general transmission mechanism, owing to can't adjust the height of one end wherein, when being directed against different process steps, just can't adapt to the spheroidal production demand of plastic completely, when follow-up needs shift transmission mechanism simultaneously, also quite hard. In view of this, we propose a product conveying mechanism for plastic sphere production line.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide a product conveying mechanism for a plastic sphere production line, so as to solve the problems in the prior art.

In order to achieve the purpose, the invention provides a product conveying mechanism for a plastic sphere production line, which comprises a bottom frame, wherein a conveying assembly is arranged right above the top of the bottom frame, a lifting assembly is arranged between the conveying assembly and the bottom frame, a collecting assembly is arranged at the left end of the conveying assembly, and a moving assembly is arranged at the right end of the bottom frame.

In an embodiment of the invention, the conveying assembly comprises a mounting plate, the front end and the rear end of the top of the mounting plate are fixedly provided with a protection plate, the protection plate is rotatably connected with a pair of rotating shafts, each rotating shaft is fixedly provided with a pair of chain wheels, the left pair of chain wheels and the right pair of chain wheels are in transmission connection with chains, the opposite side walls of the two chains are fixedly provided with a plurality of mounting blocks which are distributed at equal intervals, and the two corresponding mounting blocks are fixedly provided with chain plates through screws.

In an embodiment of the present invention, the chain plate is provided with a plurality of stabilizing holes, and the chain plate is further fixed with a blocking plate.

In an embodiment of the present invention, the lifting assembly includes a pair of legs fixed at the left end position of the top of the bottom frame, a rotating rod is rotatably connected to the two legs, a pair of supporting blocks is fixed to the rotating rod, and the supporting blocks are fixedly connected to the bottom wall of the mounting plate.

In an embodiment of the invention, the lifting assembly comprises an installation support fixed at the top of the underframe near the middle position, the installation support is in an inverted U shape, a pair of screw rod lifters are installed on the top wall of the installation support, screw rod parts of the screw rod lifters penetrate through the installation support, the two screw rod lifters are in transmission connection through a linkage shaft, a driving motor is installed at one end of the linkage shaft, an output shaft of the driving motor is fixedly connected with the linkage shaft, a top disc is fixed at the top of the screw rod parts of the screw rod lifters, a wheel carrier is rotatably connected to the top disc, and rollers are arranged in the wheel carrier.

In an embodiment of the present invention, the lifting assembly further includes a wheel groove formed at the bottom of the mounting plate, and the upper half end of the roller is located in the wheel groove and is in rolling connection with the wheel groove.

In an embodiment of the invention, the collecting assembly comprises a fixing plate fixed on the left side wall of the mounting plate, the fixing plate is provided with a plurality of fixing holes distributed at equal intervals, collecting hoppers are tightly bonded in the fixing holes, the lower ends of the collecting hoppers are communicated with lower ball tubes, the collecting assembly further comprises a collecting box placed at the top of the underframe, the collecting box is divided into a plurality of rows of placing areas, collecting barrels are placed in each placing area, and each row of collecting barrels corresponds to the lower ball tubes one by one.

In an embodiment of the invention, the collecting assembly further comprises a pushing cylinder mounted on the bottom frame, the end of a piston rod of the pushing cylinder is fixedly connected with the outer wall of the collecting box, and the collecting hoppers correspond to the stabilizing holes one by one.

In an embodiment of the present invention, the moving assembly includes moving wheels fixed at four corners of a bottom wall of the bottom frame and a pair of mounting blocks fixed on a right side wall of the bottom frame, the two mounting blocks are rotatably connected with a rotating connecting rod, a pair of telescopic rods is fixed on an outer wall of the rotating connecting rod, and top portions of the two telescopic rods are connected with a push rod.

In an embodiment of the present invention, the two ends of the rotating connecting rod are both provided with external threads, the thread directions of the external threads at the two ends are opposite, the two ends of the rotating connecting rod are both connected with threaded sleeves in a threaded manner, and the outer wall of each threaded sleeve is fixed with a force application rod.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. according to the plastic ball conveying mechanism, the chain plate conveyor is adopted for conveying plastic balls, the mounting blocks which are arranged on the chain at equal intervals are welded, the mounting blocks are connected with the chain plate through screws, the chain plate can be replaced according to the size of the plastic balls, the plastic ball conveying mechanism is suitable for production and transmission of the plastic balls with different specifications, meanwhile, the lifting assembly is adopted, and the screw rod lifter is used for lifting one end of the conveying assembly, so that the conveying assembly can meet production requirements of external production equipment with different heights, compared with a traditional conveying mechanism with a fixed structure, production efficiency is improved, cost input is reduced to a certain extent, and the conveying mechanism is wider in application range.

2. According to the plastic ball collecting device, the collecting assembly is matched with the conveying assembly, plastic balls conveyed by the chain plate can directly fall into the collecting hopper, then fall into the corresponding collecting cylinder of the corresponding collecting box through the ball discharging pipe, and meanwhile, the collecting box can be continuously pushed by the pushing cylinder to be automatically collected, so that the problem that the plastic balls need to be manually collected after the conveying is finished is avoided, and the labor intensity of workers is reduced.

3. According to the invention, the telescopic rod and the push rod can be contracted and expanded at any time by matching the rotating connecting rod with the pair of mounting blocks in the moving assembly, the whole transmission mechanism can be pushed through the push rod after the rotating connecting rod is locked by the threaded sleeve, compared with the traditional transmission mechanism, the moving process is more convenient and labor-saving, meanwhile, the moving assembly cannot influence the normal transmission of the plastic balls, and the problem that the production requirement of the plastic balls cannot be completely met due to the fact that the height of one end of the common transmission mechanism cannot be adjusted in different process steps, and meanwhile, the transmission mechanism is quite laborious when the transmission mechanism needs to be displaced subsequently is solved.

Drawings

FIG. 1 is a schematic view of a product conveying mechanism for a plastic sphere production line according to the present invention;

FIG. 2 is a front view of the product conveying mechanism for the plastic sphere production line of the present invention;

FIG. 3 is a schematic view of the structure of the conveyor assembly of the present invention;

FIG. 4 is an exploded view of a portion of the transfer assembly of the present invention;

FIG. 5 is a schematic view of the overall structure of the lift assembly of the present invention;

FIG. 6 is a schematic bottom structural view of the present invention;

FIG. 7 is a schematic illustration of the lift assembly configuration of the present invention;

FIG. 8 is a schematic diagram of the collection assembly of the present invention;

fig. 9 is a schematic diagram of the structure of the moving assembly of the present invention.

Description of reference numerals:

the base frame 1, the conveying assembly 2, the mounting plate 21, the protective plate 211, the rotating shaft 22, the chain wheel 221, the chain 222, the chain plate 23, the mounting block 231, the mounting groove 232, the interception plate 233 and the stabilizing hole 234;

the lifting assembly 3, the supporting leg 31, the rotating rod 311, the supporting block 312, the mounting bracket 32, the screw rod lifter 33, the top disc 331, the wheel frame 332, the roller 3321, the driving motor 34 and the wheel groove 35;

the collecting component 4, the fixing plate 41, the collecting hopper 42, the lower bulb 421, the collecting box 43, the collecting cylinder 431 and the pushing cylinder 44;

the moving assembly 5, the moving wheel 41, the mounting block 52, the rotating connecting rod 53, the telescopic rod 54, the push rod 541, the threaded sleeve 55 and the force application rod 551.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

Example 1

Referring to fig. 1-2, a preferred embodiment of the present invention includes an underframe 1, a conveying assembly 2 is disposed directly above the top of the underframe 1, a lifting assembly 3 is disposed between the conveying assembly 2 and the underframe 1, a collecting assembly 4 is disposed at the left end of the conveying assembly 2, and a moving assembly 5 is disposed at the right end of the underframe 1.

In the above scheme, conveyor component 2 is used for transmitting the plastic spheroid after the contour machining, conveyor component 2's structure can carry out the dismouting simultaneously, can adapt to the plastic spheroid of different specifications, lifting subassembly 3 can carry out the lifting to conveyor component 2's one end, make whole transport mechanism can adapt to the plastic spheroid production line of co-altitude not, collection subassembly 4 is used for directly carrying out the categorised collection management after the plastic spheroid transmission, the increase of the staff intensity of labour that not only has avoided artifical collection to lead to, can avoid the plastic spheroid to pile too much simultaneously and lead to the ball wall damage, removal subassembly 5 makes the staff can more swiftly and conveniently remove whole device.

Example 2

In a preferred embodiment, referring to fig. 3-4, the conveying module 2 includes a mounting plate 21, a pair of rotating shafts 22 are rotatably connected to the mounting plate 211, a pair of chain wheels 221 are fixed to each rotating shaft 22, a pair of chains 222 are rotatably connected to the left and right pairs of chain wheels 221, a plurality of mounting blocks 231 are fixed to opposite side walls of the two chains 222 and are distributed at equal intervals, and the chain plates 23 are fixed to the two corresponding mounting blocks 231 through screws.

In the above scheme, the motor drive pivot through the outside rotates, and sprocket 221, chain 222 and link joint 23 constantly move, simultaneously through the setting of installation piece 231 for link joint 23 can be pulled down from installation piece 231 fast, and the not spheroidal transmission of different specifications plastic of adaptation need not change whole transmission device when changing the production line, has saved the cost to a certain extent.

In a preferred embodiment, the link plate 23 defines a plurality of stabilizing apertures 234. Because in transmission process, link joint 23 can produce vibrations, and at the vibration in-process, the plastic spheroid constantly removes, alright in order to place on stabilizer hole 234 automatically, convenient follow-up collection avoids the plastic spheroid to pile up, and simultaneously, some volume are not enough, the defective products that the diameter is not enough can directly fall from stabilizer hole 234, play the effect of quick screening.

In a preferred embodiment, a endstop 233 is also secured to the link plate 23. When one end of the conveyor assembly 2 is lifted, in order to prevent the plastic spheres from falling to the ground, effective interception can be performed by the interception plate 233.

Example 3

In a preferred embodiment, referring to fig. 5-7, the lifting assembly 3 comprises a pair of legs 31 fixed to the bottom frame 1 at the top left end, a rotating rod 311 is rotatably connected to each leg 31, a pair of supporting blocks 312 are fixed to the rotating rod 311, and the supporting blocks 312 are fixedly connected to the bottom wall of the mounting plate 21.

In the above scheme, through the supporting block 312 and the rotating rod 311, in the process that one end of the conveying assembly 2 away from the supporting block 312 is lifted, the conveying assembly rotates around the rotating rod 311 all the time, and a stable supporting effect is achieved.

In a preferred embodiment, the lifting assembly 3 comprises a mounting bracket 32 fixed to the top of the bottom frame 1 near the middle position, the mounting bracket 32 is in an inverted U shape, a pair of screw rod lifters 33 are mounted on the top wall of the mounting bracket 32, screw rod parts of the screw rod lifters 33 penetrate through the mounting bracket 32, the two screw rod lifters 33 are in transmission connection through a linkage shaft, a driving motor 34 is mounted at one end of the linkage shaft, and an output shaft of the driving motor 34 is fixedly connected with the linkage shaft. Through screw mandrel lift 33, can effectively carry out the lifting to conveying element 2, the installing support 32 that is the shape of falling U makes screw mandrel lift 33 can normal operating, so set up two, can make the lifting process more steady, follow-up also can be more firm when transmitting the plastic spheroid.

In a preferred embodiment, a top plate 331 is fixed on the top of the screw member of the screw rod lifter 33, a wheel frame 332 is rotatably connected to the top plate 331, a roller 3321 is disposed in the wheel frame 332, the lifting assembly 3 further includes a wheel groove 35 opened at the bottom of the mounting plate 21, and the upper half end of the roller 3321 is disposed in the wheel groove 35 and is in rolling connection with the wheel groove 35. In order to ensure that the right end of the conveying component 2 can be accurately lifted, the friction force between the lifting component 3 and the conveying component 2 is reduced through the matching of the roller 3321 and the wheel groove 35, and meanwhile, under the action of the supporting block 312 and the rotating rod 311, the conveying component 2 can rotate on the premise of the circle center of the rotating rod 311, so that the right end of the conveying component 2 is continuously lifted away from the ground.

Example 4

In a preferred embodiment, referring to fig. 8, the collecting assembly 4 includes a fixing plate 41 fixed on the left side wall of the mounting plate 21, the fixing plate 41 is provided with a plurality of fixing holes distributed at equal intervals, the collecting hopper 42 is tightly adhered in the fixing holes, the lower end of the collecting hopper 42 is communicated with the lower ball tube 421, the collecting assembly 4 further includes a collecting box 43 placed on the top of the chassis 1, the collecting box 43 is partitioned into a plurality of rows of placing areas, each placing area is provided with a collecting cylinder 431, and each row of collecting cylinders 431 corresponds to the lower ball tube 421 one by one.

In the above-mentioned scheme, collect 42 and the stabilizer hole 234 one-to-one, break away from the back in stabilizer hole 234 when the plastic spheroid, just can directly fall in the collection of correspondence is fought 42, directly falls in the collector 431 through bulb 421 down afterwards, and whole process automation is accomplished, does not need staff's manual collection, and a plurality of collector 431 mutual noninterferences have simultaneously avoided the plastic spheroid to collect the in-process because pile up the damage and the fish tail that takes place.

In a preferred embodiment, the collecting assembly 4 further comprises a push cylinder 44 mounted on the chassis 1, the end of the piston rod of the push cylinder 44 being fixedly connected to the outer wall of the collecting chamber 43. Since the collecting box 43 can be placed with a plurality of rows of collecting barrels 431, in order to further improve the collecting efficiency and reduce the labor intensity of the workers, the collecting box 43 is pushed by the pushing cylinder 44 to move leftwards continuously, and each collecting barrel 431 can be filled with plastic balls during the moving process.

Example 5

In a preferred embodiment, referring to fig. 9, the moving assembly 5 includes moving wheels 41 fixed to four corners of the bottom wall of the chassis 1 and a pair of mounting blocks 52 fixed to the right side wall of the chassis 1, a rotating link 53 is rotatably connected to the two mounting blocks 52, a pair of telescopic rods 54 is fixed to the outer wall of the rotating link 53, and a push rod 541 is connected to the tops of the two telescopic rods 54.

In the above-mentioned scheme, through telescopic link 54 and push rod 541, can promote whole transmission device fast under the effect of removal wheel 41, be convenient for remove transmission device to predetermined plastic spheroid production line, utilize telescopic link 54 and rotate the rotation connecting rod 53 of connecting simultaneously, can fold removal subassembly 5 and pack up, avoid causing the influence to whole production flow at production plastic spheroid in-process.

In a preferred embodiment, both ends of the rotating link 53 are provided with external threads, the thread directions of the external threads at both ends are opposite, both ends of the rotating link 53 are connected with threaded sleeves 55 in a threaded manner, and the force applying rod 551 is fixed on the outer wall of the threaded sleeves 55. In order to enable the moving assembly 5 to be normally folded and unfolded, the rotating connecting rod 53 can be firmly locked and locked through the threaded sleeve 55, so that the angle between the telescopic rod 54 and the vertical plane can be adjusted at any time, further, the distance between the push rod 541 and the ground can be matched with workers with different heights, and further, the process of pushing the whole transmission mechanism is more quickly guaranteed. Meanwhile, the force application rod 551 can ensure that the threaded sleeve 55 can be assembled and disassembled more conveniently and more laborsavingly.

The working principle of the product transmission mechanism for the plastic sphere production line is as follows: firstly, replacing the corresponding chain plate 23 according to the sphere diameter of a plastic sphere to be produced, only aligning the mounting groove 232 to the mounting block 231 and locking the chain plate 23 and the mounting block 231 by screws, then adjusting the height of the conveying assembly 2 according to different production line heights, only opening the driving motor 34 when lifting is needed, enabling the two lead screw lifters 33 to work simultaneously under the action of a linkage shaft, enabling the lead screw parts of the lead screw lifters 33 to rise, enabling the roller 3321 to have an upward thrust on the bottom wall of the mounting plate 21, enabling the conveying assembly 2 to rotate by taking the rotating rod 311 as a center under the action of the rotating rod 311, enabling the roller 3321 to rise continuously and roll in the wheel groove 35, and closing the driving motor 34 until the height is raised to a preset height;

then, an external motor is turned on to drive the conveying assembly 2 to operate, when the plastic spheres continuously fall on the chain plate 23, the chain plate 23 vibrates, the plastic spheres continuously move and fall on the stabilizing holes 234, if the angle between the conveying assembly 2 and the ground is too large, the plastic spheres are also blocked by the blocking plate 233 and cannot fall on the ground, when the plastic spheres operate to the left end of the conveying assembly 2, the plastic spheres directly fall into the corresponding collecting hoppers 42 from the stabilizing holes 234 and directly fall into the collecting cylinders 431 through the sphere discharging pipes 421, the pushing cylinders 44 are turned on to push the collecting boxes 43 to continuously move leftwards, and each collecting cylinder 431 can be filled with the plastic spheres;

when the whole transmission mechanism needs to be shifted, the threaded sleeve 55 only needs to be loosened, the rotating connecting rod 53 is rotated by a corresponding angle, the telescopic rod 54 is pulled out, then the telescopic rod 54 and the push rod 541 are held, the rotating connecting rod 53 is locked by the threaded sleeve 55, the push rod 541 can be held to be pushed, when the moving assembly 5 is folded, the telescopic rod 54 only needs to be folded, the rotating connecting rod 53 rotates when the threaded sleeve 55 is loosened, the rotating connecting rod 53 is placed on the bottom frame 1, the common transmission mechanism is solved, because the height of one end of the common transmission mechanism cannot be adjusted, when different process steps are aimed at, the production requirement of a plastic sphere cannot be completely met, and meanwhile, when the transmission mechanism needs to be shifted subsequently, the problem of great labor is also solved.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.