JP2013075606A - Platform of movable carriage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems with a configuration to lift a platform by extending an extensible cylinder and widening a cross link using an electric motor, wherein the cross link and the extensible cylinder are substantially parallel to each other in a lowered position of the lift, and the output in the extending direction of the extensible cylinder when the lift is raised acts along the length direction of the cross link, thereby preventing the lift from moving upward.SOLUTION: On a chassis 1, a movable lift 4 is supported via cross links 2, 3 having a rotation support part A formed at a base end and a slide support part B formed at a distal end. Between the distal end side of the cross link 2 and the chassis 1 formed below, an extensible cylinder 6 is disposed, which is extended and contracted by the electric motor 5 to expand and contract the cross links 2, 3. Between the lift 4 on the distal end side of the cross links 2, 3 and the chassis 1, a damper cylinder 7 is disposed which is substantially parallel to the extensible cylinder 6 at the lowered position of the lift 4.

Description

  The present invention relates to a lifting platform for a moving carriage, which expands and contracts a lifting link by extending and retracting a cross link via an expansion / contraction cylinder that is expanded and contracted by an electric motor, and smoothly lifts and lowers the lifting platform in a stable posture. It is.

  There are known a technique (for example, see Patent Document 1) for raising and lowering a lifting platform of a movable carriage via a cross link mechanism, a technique for providing a damper cylinder in the cross link mechanism (for example, see Patent Document 2), and the like.

JP 2010-274704 A JP 2005-170572 A

  In the form in which the telescopic cylinder is extended by the electric motor to open the cross link and raise the lifting platform, the cross link and the telescopic cylinder at the lowered position of the lifting platform are arranged in a state of being almost parallel. Therefore, the output in the extending direction of the telescopic cylinder at the time of starting up the lifting platform acts along the length direction of the cross link, and it is difficult to lift the lifting platform.

  According to the first aspect of the present invention, a lifting platform 4 that can be moved up and down is supported on a chassis 1 through cross links 2 and 3 having a rotation support portion A at a base end portion and a slide support portion B at a distal end portion. A telescopic cylinder 6 is provided between the front end portion of the cross link 2 and the chassis 1 below the cross link 2 to expand and contract the cross links 2 and 3 by an electric motor 5, and the front ends of the cross links 2 and 3 are provided. An elevator platform for a movable carriage, characterized in that a damper cylinder 7 is provided between the elevator platform 4 on the side and the chassis 1 part, and a damper cylinder 7 that is substantially parallel to the telescopic cylinder 6 is provided at the lowered position of the elevator platform 4. The configuration is as follows.

  The expansion cylinder 6 is expanded and contracted by the drive of the electric motor 5, the cross links 2 and 3 are expanded and contracted, and the lifting platform 4 is moved up and down. When the telescopic cylinder 6 is reduced and the cross links 2 and 3 are closed and the lifting platform 4 is placed at the lowest position, the cross links 2 and 3 are positioned between the chassis 1 and the lifting platform 4. As a state parallel to these, the height of the lifting platform 4 can be maintained at a low position. When the elevating platform 4 in the lowered position is raised by the extension of the telescopic cylinder 6, the cross links 2 and 3 are rotated around the rotation support portion A by the extension output of the telescopic cylinder 6. The elastic force of the damper cylinder 7 is working, and the rotation of the cross links 2 and 3 is aided to rotate the link smoothly. When the cross-links 2 and 3 are closed and the lift 4 is in the lowered position, the telescopic cylinder 6 is in the form of parallel polymerization along the direction of the cross-links 2 and 3. Even if the extension force of the telescopic cylinder 6 works, it is difficult for the cross links 2 and 3 to stand up and rotate. Since the generating force is working, the upright rotation of the cross links 2 and 3 is performed quickly and smoothly.

  According to a second aspect of the present invention, the damper cylinder 7 is connected to the tip end portion of the lifting / lowering table 4 via a damper arm 8 that can be bent and revolved. Thus, the front end of the lifting platform 4 is supported, and when it is lowered, the damper cylinder 7 is overlapped and accommodated in a substantially parallel manner with the expansion cylinder 6 while the damper arm 8 is refracted and rotated.

  As described above, the cross links 2 and 3 are expanded and contracted by the expansion and contraction of the telescopic cylinder 6 by the electric motor 5, and the lifting platform 4 is moved up and down. The tip end side of the lifting platform 4 is connected and supported by a damper arm 8 provided at the tip end portion 9 of the damper cylinder 7. The damper support area due to the expansion and contraction of the damper cylinder 7 is limited to a relatively short area. However, when the lifting platform 4 is raised to a high position beyond the damper support area, the damper arm 8 at the tip end portion 9 of the damper cylinder 7 is used. However, it opens in the extending direction of this damper cylinder 7 from a refraction rotation state, and the front-end | tip part of the raising / lowering stand 4 connected to a front-end | tip is supported by a damper.

  The invention described in claim 3 is characterized in that a guide plate 10 for slidingly guiding the tip 9 of the damper cylinder 7 that connects the damper arm 8 is provided on the tip of the cross link 2.

  As described above, the lifting platform 4 that is lifted and lowered via the cross links 2 and 3 that are expanded and contracted by the expansion and contraction of the expansion / contraction cylinder 6 is connected and supported by the damper arm 8 of the distal end portion 9 of the damper cylinder 7. In the damper effective area of the cylinder 7, the guide plate 10 of the cross link 2 is guided and supported by the tip end portion 9 of the damper cylinder 7, and the lifting platform 4 is supported via the cross link 2. The tip of the lift 4 is supported via a damper arm 8 between the tip 9 of the lift 7 and the tip of the lift 4. When the elevating platform 4 is further raised to a higher position by extension of the telescopic cylinder 6, the tip 9 of the damper cylinder 7 is moved away from the sliding area of the guide plate 10 of the cross link 2, and the damper arm 8 is moved. The upper end of the lifting platform 4 is supported by a damper by widening upward. When the elevator 4 is lowered from the raised position, the opening of the damper arm 8 with respect to the damper cylinder 7 is closed, and the tip 9 of the damper cylinder 7 is slidably supported on the guide plate 10 of the cross link 2. The lifting platform 4 can be lowered by contraction of the telescopic cylinder 6 while sliding the tip portion 9 on the guide plate 10.

  According to the first aspect of the present invention, the elevator 4 raised and lowered by the cross links 2 and 3 is raised and lowered by the telescopic cylinder 6 that is expanded and contracted by the electric motor 5 and the damper that supports the tip of the elevator 4 is supported. Since the cylinder 7 is provided substantially in parallel with the telescopic cylinder 6 in the lowered position of the lift 4, the lift 4 is in the lowered position, and the cross links 2, 3 are parallel to the lift 4. Even when the telescopic cylinder 6 starts to extend even in the face down state, the initial elastic force of the damper cylinder 7 acts in the same direction at the same time, so that the raising and lowering of the lifting platform 4 is smoothly and lightly performed. Can be made. Moreover, although the front ends of the cross links 2 and 3 serve as a slide support B, the front end of the elevating platform 4 is directly connected and supported by the damper cylinder 7 so that it can be laterally swung or vertically swung. Reduce and maintain a stable posture. Moreover, the ascending start drive of the lifting platform 4 is based on a parallel arrangement form of the damper cylinder 7 with respect to the telescopic cylinder 6, the configuration can be simplified, the output of the electric motor 5 is reduced, and it is lightweight and inexpensive. Can be.

  According to the second aspect of the present invention, the damper arm 8 is refractably connected to the tip portion 9 of the damper cylinder 7 and the tip portion of the lifting platform 4 is connected and supported. Thus, the lifting / lowering stroke can be increased, and the damper action can be effectively applied in all steps of the lifting / lowering table 4. The configuration in which the damper arm 8 is connected to the tip 9 of the damper cylinder 7 is simple. Further, the damper arm 8 is refracted to the tip end portion 9 of the damper cylinder 7 so as to bend and rotate so as to follow the damper cylinder 7, so that when the elevator 4 is lowered, these damper cylinders 7 In addition, the damper arm 8 is superposed in parallel with the telescopic cylinder 6 so that the lower limit position of the lowered elevator 4 can be set low, and the length and configuration of the damper cylinder 7 can be simplified in a small size.

  According to the third aspect of the present invention, the damper arm 8 is provided at the tip 9 of the damper cylinder 7 as described above, and the tip of the elevator 4 is stably supported by the damper. In the ascending / descending height region, by directly sliding and supporting the tip end portion 9 of the damper cylinder 7 on the guide plate 10 provided on the tip end side of the cross link 2, the lifting platform 4 is provided via the cross link 2. It is possible to perform a stable and smooth expansion / contraction operation of the cross link 2 by supporting the tip of the damper. Further, in the posture in which the lifting platform 4 is raised above the predetermined height, the refraction angle of the damper arm 8 at the distal end portion 9 of the damper cylinder 7 is opened, and the supporting force at the distal end portion of the lifting platform 4 can be increased. The tip 9 of the damper cylinder 7 is moved away from the guide plate 10 of the cross link 2, and the tip of the elevator 4 is directly supported by the damper via the damper cylinder 7 and the damper arm 8. As a result, the damper operating range of the damper cylinder 7 can be shortened, and a simple and inexpensive structure can be achieved.

The side view of a moving trolley | bogie. The side view which shows the lifting platform operating state. The side view which shows the lifting platform operating state. The side view which shows the lifting platform operating state. The side view at the time of changing the handle back and forth. The top view which shows the cross-link part of a mobile trolley | bogie. The side view which shows the lifting platform operating state.

  Based on the drawings, the movable carriage has a rear wheel 11 on both left and right sides driven by a motor M, caster wheels 12 on the left and right sides on the front side, and left and right sides on the upper end of the handle 13 at the rear end. And operating the motor M and the wheels 11 via the load cell 15 and the controller 38 in the handle cover 16 by holding the operation grip 14 and pushing and pulling it in the front-rear direction. Can do. The chassis 1 is in the form of a rectangular girder that is long in the front and rear, and the rear wheel 11 and caster wheels 12 are disposed on the left and right sides at the lower side of the chassis 1, and the handle 13 is attached to the rear end via an attachment bracket 17. Installed. Further, as shown in FIG. 5, the handle 13 can be replaced with a mounting bracket 18 at the front end of the chassis 1. A battery 19 is mounted on the central side of the chassis 1 and serves as a power source for the electric motor 5 for the telescopic cylinder 6, the motor M for driving the rear wheels 11, the controller 38 for operation control, and the like.

  The lifting platform 4 arranged on the chassis 1 is supported at the center in the vehicle width direction via the cross links 2 and 3 and is lifted in a state where the horizontal posture is maintained by the expansion and contraction of the cross links 2 and 3. Is done. Each of the cross links 2 and 3 is a pair of left and right parallel links, with the center portion in the longitudinal direction intersecting in an X shape, and rotated around the cross pin 20 in the lateral direction along the intersecting portion to expand and contract. it can. The base ends of the cross links 2 and 3 are used as the rotation support portion A, and the base (rear) end of the cross link 2 is pivotally supported by the link shaft 21 on the rear end of the chassis 1. The rear end is pivotally supported on the rear end of the lifting platform 4 by a link shaft 22, and the base ends of the cross links 2 and 3 are rotatably supported around the link shafts 21 and 22. Further, guide rolls 23 and 24 are provided at the front (front) end portions of the cross links 2 and 3 via link shafts 39 and 40 that connect the front end portions of the left and right cross links 2 and 3, respectively. The guide roll 23 of the link 2 is slidably supported by being fitted to a guide rail 25 provided along the lower side of the elevator 4, and the guide roll 24 of the cross link 3 is provided as a guide rail provided along the chassis 1. The slide support portion B is configured by the guide rails 25 and 26 and the guide rolls 23 and 24 in a form of being slidably supported by being fitted to the guide 26. The guide rails 25 and 26 are arranged in parallel on both the left and right sides so as to face the guide rolls 23 and 24 of the cross links 2 and 3, and support the lifting platform 4 horizontally.

  The telescopic cylinder 6 for raising and lowering the hoisting table 4 is connected between a cylinder pin 27 at a position near the tip of the cross link 2 and a cylinder pin 29 of a bracket 28 at the front end of the chassis 1. The cross links 2 and 3 can be expanded and contracted by expanding and contracting the six pistons 30 with oil pressure. The electric motor 5 and the cylindrical oil tank 31 are integrally formed on the cylinder pin 27 side of the telescopic cylinder 6, and are arranged along the lower side of the telescopic cylinder 6 in parallel. The oil in the oil tank 31 is supplied to the hydraulic circuit of the telescopic cylinder 6 to cause the piston 30 to expand and contract.

  A damper cylinder 7 is disposed along the upper side of the telescopic cylinder 6, and a front end portion of the damper cylinder 7 is pivotally supported on the bracket 28 by a cylinder pin 32. The damper cylinder 7 is in the form of an air (gas) damper, and the spindle 33 is expanded and contracted under a certain air (gas) pressure resistance to have a damper function. A damper arm 8 is connected to the tip 9 of the spindle 33 of the damper cylinder 7 by a link pin 35, and the tip of the damper arm 8 is connected to the front end of the lifting platform 4 by an arm pin 34. A rotatable roll 36 is provided around a link pin 35 between the spindle 33 and the damper arm 8 to constitute the tip end portion 9 of the damper cylinder 7. A guide plate 10 having an appropriate length is formed at an intermediate portion between the cylinder pin 27 and the guide roll 23 of the cross link 2, and the lower surface of the guide plate 10 is received by the roll 36 of the tip end portion 9, The guide plate 10 that relatively moves back and forth and the roll 36 are slidably supported.

  The bracket 28 protrudes below the front end of the chassis 1 and is provided close to the front side of the caster wheel 12, and has a guard function for the caster wheel 12. The telescopic cylinder 6 and the damper cylinder 7 pivotally supported by the cylinder pins 29 and 32 with respect to the bracket 28 become substantially parallel when the elevating platform 4 is at the lowest lowered position as shown in FIG. It is configured to approach to In this state, the damper arm 8 of the damper cylinder 7 is also folded around the link pin 35 of the distal end portion 9 and is in a state along the upper side of the damper cylinder 7. Thus, by setting the cylinder pins 29 and 32 at the front lower ends of the telescopic cylinder 6 and the damper cylinder 7 as low as possible by the bracket 28, the lower limit position of the lifting platform 4 can be set at the low position. In addition, the tilting angle in the extending / contracting direction of the telescopic cylinder 6 and the damper cylinder 7 is set to make it easy to perform the ascending output for raising the lifting platform 4.

  As shown in FIG. 6, the damper cylinder 7 is arranged in a pair of left and right in parallel to prevent twisting and twisting of the damper cylinder 7, the spindle 33, the damper arm 8, etc. The action can be performed. A damper cylinder 7 is arranged in parallel between a pair of left and right damper arms 8 which are configured to be narrower than the width interval of the cross links 2, 3, and the tip of the spindle 33 of the damper cylinder 7 is placed on the link pin 35. The rolls 36 are rotatably provided in the center of the link pins 35.

  Here, on the chassis 1, an elevating platform 4 that can be moved up and down is supported via cross links 2 and 3 having a rotation support portion A at the base end portion and a slide support portion B at the front end portion. A telescopic cylinder 6 is provided between the front end side and the lower chassis 1 to expand and contract the cross links 2 and 3 by an electric motor 5, and the lifting platform 4 on the front end side of the cross links 2 and 3. A damper cylinder 7 that is substantially parallel to the telescopic cylinder 6 at the lowered position of the elevator 4 is provided between the upper part and the chassis 1 part.

  The expansion cylinder 6 is expanded and contracted by the drive of the electric motor 5, the cross links 2 and 3 are expanded and contracted, and the lifting platform 4 is moved up and down. When the telescopic cylinder 6 is reduced and the cross links 2 and 3 are closed and the lifting platform 4 is placed at the lowest position, the cross links 2 and 3 are positioned between the chassis 1 and the lifting platform 4. As a state parallel to these, the height of the lifting platform 4 can be maintained at a low position. When the elevating platform 4 in the lowered position is raised by the extension of the telescopic cylinder 6, the cross links 2 and 3 are rotated around the rotation support portion A by the extension output of the telescopic cylinder 6. The elastic force of the damper cylinder 7 is working, and the rotation of the cross links 2 and 3 is aided to rotate the link smoothly. When the cross-links 2 and 3 are closed and the lift 4 is in the lowered position, the telescopic cylinder 6 is in the form of parallel polymerization along the direction of the cross-links 2 and 3. Even if the extension force of the telescopic cylinder 6 works, it is difficult for the cross links 2 and 3 to stand up and rotate. Since the generating force is working, the upright rotation of the cross links 2 and 3 is performed quickly and smoothly.

  The damper cylinder 7 is connected to the tip of the elevator 4 via a damper arm 8 that can be bent and bent, and is expanded when the cross links 2 and 3 are expanded to support the tip of the elevator 4. Then, when it is lowered, the damper cylinder 7 is closed and retracted, and the damper cylinder 7 is accommodated in a substantially parallel manner with the expansion cylinder 6 while the damper arm 8 is bent and rotated.

  As described above, the cross links 2 and 3 are expanded and contracted by the expansion and contraction of the telescopic cylinder 6 by the electric motor 5, and the lifting platform 4 is moved up and down. The tip end side of the lifting platform 4 is connected and supported by a damper arm 8 provided at the tip end portion 9 of the damper cylinder 7. The damper support area due to the expansion and contraction of the damper cylinder 7 is limited to a relatively short area. However, when the lifting platform 4 is raised to a high position beyond the damper support area, the damper arm 8 at the tip end portion 9 of the damper cylinder 7 is used. However, it opens in the extending direction of this damper cylinder 7 from a refraction rotation state, and the front-end | tip part of the raising / lowering stand 4 connected to a front-end | tip is supported by a damper.

  A guide plate 10 that slides and guides a tip 9 of a damper cylinder 7 that connects the damper arm 8 is provided on the tip of the cross link 2.

  As described above, the lifting platform 4 that is lifted and lowered via the cross links 2 and 3 that are expanded and contracted by the expansion and contraction of the expansion / contraction cylinder 6 is connected and supported by the damper arm 8 of the distal end portion 9 of the damper cylinder 7. In the damper effective area of the cylinder 7, the guide plate 10 of the cross link 2 is guided and supported by the tip end portion 9 of the damper cylinder 7, and the lifting platform 4 is supported via the cross link 2. The tip of the lift 4 is supported via a damper arm 8 between the tip 9 of the lift 7 and the tip of the lift 4. When the elevating platform 4 is further raised to a higher position by extension of the telescopic cylinder 6, the tip 9 of the damper cylinder 7 is moved away from the sliding area of the guide plate 10 of the cross link 2, and the damper arm 8 is moved. The upper end of the lifting platform 4 is supported by a damper by widening upward. When the elevator 4 is lowered from the raised position, the opening of the damper arm 8 with respect to the damper cylinder 7 is closed, and the tip 9 of the damper cylinder 7 is slidably supported on the guide plate 10 of the cross link 2. The lifting platform 4 can be lowered by contraction of the telescopic cylinder 6 while sliding the tip portion 9 on the guide plate 10.

  The elevating platform 4 is moved up and down from the lowermost position P1 (FIG. 2) to the uppermost position P3 (FIG. 4) through the middle position P2 (FIG. 3) by the expansion and contraction of the telescopic cylinder 6. The relative positions of the telescopic cylinder 6, the damper cylinder 7, the damper arm 8, the guide plate 10 and the like at this time are shown in FIG. When the telescopic cylinder 6 is located from the lowest position P1 to the middle position P2, the roll 36 at the tip 9 of the damper cylinder 7 is in sliding contact with the lower surface of the guide plate 10 of the cross link 2 to support the cross link 2. You can do it. And the roll 36 of the front-end | tip part 9 of the damper cylinder 7 in this intermediate | middle position P2 exists in the separation point R position, is located in the front-end edge part of the guide plate 10, and the raising / lowering stand 4 is from this intermediate | middle position P2. When the roller 36 is further raised, the roll 36 is separated from the front end portion of the guide plate 10 to the front side, the support of the cross link 2 by the damper cylinder 7 is released, and the lifting platform 4 of the elevator platform 4 is released via the damper arm 8 of the damper cylinder 7. The tip is supported. Further, in the step in which the elevator 4 is lowered from the uppermost position P3 to the step position P2, the roll 36 that has been separated from the front of the guide plate 10 is folded on the tip portion 9 of the damper cylinder 7. The movement returns to the lower side of the descending guide plate 10 to slidably support the guide plate 10.

1 chassis 2 cross link 3 cross link 4 lifting platform 5 electric motor 6 telescopic cylinder 7 damper cylinder 8 damper arm 9 tip portion 10 guide plate A rotation support portion B slide support portion

Claims (3)

  On the chassis (1), a lifting platform (4) which can be lifted and lowered by disengaging the cross links (2) and (3) having the rotation support portion (A) at the proximal end and the slide support portion (B) at the distal end. ) And expands and contracts the cross links (2) and (3) between the front end side of the cross link (2) and the lower chassis (1) by an electric motor (5). A telescopic cylinder (6) is provided, and the lowering position of the lifting platform (4) is disposed between the lifting platform (4) and the chassis (1) on the distal end side of the cross links (2) and (3). An elevator platform for a moving carriage, comprising a damper cylinder (7) that is substantially parallel to the telescopic cylinder (6).   The damper cylinder (7) is connected to the tip of the lifting platform (4) via a refraction-rotatable damper arm (8), and is expanded when it is raised by the expansion and contraction of the cross links (2) and (3). Then, it supports the tip of the lift (4) and closes when lowered, and the damper cylinder (7) is superposed in parallel with the telescopic cylinder (6) while bending the damper arm (8). The lifting / lowering platform for a movable carriage according to claim 1, wherein the carriage is accommodated.   A guide plate (10) for slidingly guiding the tip (9) of the damper cylinder (7) connecting the damper arm (8) is provided on the tip of the cross link (2). A lifting platform for a moving carriage according to claim 2.

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