Stopper plate operation device of stopper part in platform of lift for automobile

Abstract

To provide a stopper plate operation device of a stopper part in a platform of a lift for an automobile.SOLUTION: A lift for an automobile in which a vehicle side and a platform side are connected to each other by a parallel link composed of an upper arm and a lower arm has an upper pivot receiving hole for fitting and supporting a pivot fit to and supported on a tip shaft of the upper arm or a connection hole of a tilt link connected to the tip shaft, on its upper part, and horizontally has holding links having lower supporting shaft receiving holes for fitting and supporting the tip shaft of the lower arm, on its lower part, wherein the platform falls and operates a stopper plate of a stopper part, in vertical longitudinal storage rise rotation from a horizontally moored state to a load carrying platform around the pivoting shaft, has a shaft part for operation provided at a position having a moving difference to the holding links of a platform base end, in opposite vertical longitudinal storage rise rotation or opposite rotation, and operates a transmission mechanism connected to the shaft part for operation and raises and operates the stopper plate of the stopper part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a stopper plate operating device for a stopper part on a platform of an automobile lift, which automatically operates the stopper plate of the stopper part arranged on the platform to lie down or stand up using a link that is linked to the platform's upright storage operation or horizontal deployment operation. [Background technology]

[0002] Patent Document 1 proposes a caster stopper that is approximately L-shaped with a gentle slope A that slopes downward toward the tip of the gate plate and a steep slope B that slopes downward in the opposite direction, and is equipped with a stopper member 11 that is pivotally attached via a hinge to a notch 10 in the gate plate 4 at the lower end of the gentle slope, a support member that is fixed to the gate plate 4 and supports the stopper member 11 when pressed down, and a spring that urges the stopper member 11 in a direction that causes it to protrude from the gate plate surface, and the stopper member 11 normally protrudes from the gate plate surface and is approximately flush with the gate plate surface when pressed down.

[0003] Patent document 2 proposes a caster stopper device in which a recess 4 is formed in the loading platform floor surface 6, a stopper member 10 is pivotally attached to a position of the recess 4 near the loading platform edge, the stopper member 10 having a gentle slope A that descends toward the loading platform edge and a stopper surface B that forms an acute angle with the gentle slope A, the stopper member 10 is urged by a spring in a direction that causes it to protrude from the loading platform floor surface, and a linkage mechanism is provided that rotates the stopper member 10 to a retracted state when the lifting platform 39 of a loading work machine 30 equipped with the lifting platform 39 rises to approximately the same height as the loading floor surface 6.

[0004] Patent Document 3 proposes a retractable stopper device for the loading surface of a platform of a vehicle lifting device, comprising: a loading surface portion whose base end corresponds to an inclined boarding surface portion 5 formed at the tip of the platform 3 and which constitutes part of the loading surface of the platform when stored; a stopper 6 whose engaged portion is integral with the base end; a lock lever 12 which corresponds to the stopper 6 from the front side, is biased by a spring and has its base end journaled so that its tip rises and engages with the engaged portion, and which is configured to be rotatable so as to have an engaged portion at its base end that maintains it in a position not engaging with the engaged portion of the stopper 6, and has an unlocking foot bar 15 protruding from its tip end; and a mode switching slide shaft 17 which engages with the engaged portion at the base end of the lock lever 12 to maintain the lock lever 12 in a position not engaging with the engaged portion of the stopper 6. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Jikko No. 55-5392 [Patent Document 2] Japanese Utility Model Application Publication No. 7-8066 [Patent Document 3] Japanese Patent Application Laid-Open No. 2011-116297 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0006] In Patent Document 1, the stopper member 11 is biased upward by a spring around the hinge, protruding from the gate plate 4 and engaging with the caster. The stopper member 11 is stored by stepping on it with a foot or the like to push it down, so when the gate plate 4 is erected and stored, the stopper member 11 cannot be automatically stored in the recessed storage section.

[0007] The caster stopper device proposed in Patent Document 2 has a recess 4 formed in the platform floor 6, and a stopper member 10 having a stopper surface B that is perpendicular or forms an acute angle with a gentle slope A pivotally attached to a position in the recess 4 near the edge of the platform, the stopper member 10 being urged by a spring in a direction that causes it to protrude from the platform floor, and is equipped with a linkage mechanism that rotates the stopper member 10 into a retracted state when the lifting platform 39 rises to approximately the same height as the loading surface 6.Therefore, when the lifting platform 39 connects to the platform surface, it is automatically retracted and rotated into the recess 4 on the platform surface, but the stopper member 10 on the lifting platform 39 is not automatically retracted and rotated into the recess 4 when the lifting platform 39 is raised and stored.

[0008] The retractable stopper device proposed in Patent Document 3 is equipped with a loading surface portion whose base end corresponds to the rear edge of the inclined boarding surface portion 5 formed at the tip of the platform 3 and which forms part of the platform's loading surface when stored, and a stopper 6 whose collision portion with the wheel when erected is formed at the tip end, and which is urged in the erecting direction by a spring and pivotally supported; however, operation in the erecting direction is achieved by manually releasing the lock lever 12, and therefore, without manual operation, the platform 3 will be retracted with the stopper 6 in the erected position, which has the disadvantage of posing a danger to personnel in the vehicle compartment.

[0009] The present invention aims to provide a stopper plate operating device for a platform stopper section that uses a link linked to the platform's erection storage operation or horizontal deployment operation to automatically lower the stopper plate that stands on the platform when the platform is erected and stored, thereby eliminating the danger caused by the stopper plate being erected. [Means for solving the problem]

[0010] In an automobile lift in which the vehicle side and the platform side are connected by a parallel link made of upper arms and lower arms arranged on the left and right, retaining links are arranged on the left and right, each having an upper pivot bearing hole at its upper part for inserting and supporting a pivot shaft that is inserted and supported in the upper pivot bearing hole of the tip shaft of the upper arm or the upper pivot bearing hole of the tilt link connected thereto, and a lower support bearing hole at its lower part for inserting and supporting the tip shaft of the lower arm, and a retaining link on one side is provided at a position intermediate between the upper pivot bearing hole on the upper part and the lower support bearing hole on the lower part, and directly connecting the upper pivot bearing hole and the lower support bearing hole. The stopper plate operating device for the stopper part of the platform for a car lift has an operating shaft part extending across the platform at a position spaced from the line toward the tip of the platform, and one end of a transmission mechanism that raises and lowers the stopper plate of the stopper part is connected to the operating shaft part, so that when the platform rotates around the pivot from a horizontal state placed sideways on the loading platform to a vertically stored upright state or conversely to a horizontal state, the difference in movement of the base end of the platform relative to the left and right holding links activates the transmission mechanism connected to the operating shaft part to raise and lower the stopper plate of the stopper part.

[0011] The transmission mechanism that raises and lowers the stopper plate of the stopper portion may be a stopper plate operating device of the stopper portion on the platform of an automobile lift, which comprises at least a first operating rod whose one end is pivotally connected to an operating pivot portion provided on the retaining link, and which is connected to this first operating rod by a first L-shaped link, a stopper cylinder, an adjustment connecting rod, a second L-shaped link, and a second connecting rod.

[0012] The tip of the second connecting rod of the transmission mechanism that raises and lowers the stopper plate of the stopper part on the platform pulls or pushes the rise-and-fall connecting plate by guiding the base end shaft of the connecting rise-and-fall connecting plate through a guide hole provided on a bottom support plate provided below the loading surface of the platform, and the stopper plate to which the tip shaft provided at the tip of the rise-and-fall connecting plate is connected is operated to lie down when the platform is rotated to raise and store, around the pivot of the support base plate provided on the bottom support plate, and to raise up when the platform is rotated to raise and store, in the opposite direction, so as to be a stopper plate operating device for the stopper part on the platform of a car lift.

[0013] An entrance for the stopper plate of the stopper section is provided at the tip of the platform, leaving the left and right side ends, and a bottom support plate is provided below the inside of the entrance, and support plate sections consisting of a pair of pivot support base plates spaced apart from each other are provided at the center, left side, and right side of the bottom support plate, and pivot support plate sections consisting of a left pivot support plate and a right pivot support plate corresponding to each pivot support base plate section are provided on the back surface of the stopper plate so as to be rotatable by each pivot, and the base end of the stopper plate is accommodated under the loading surface of the platform. The stopper plate may be arranged so as to be able to stand upright around the pivot with the tip end of the stopper plate as the collision part and protrude above the loading surface of the platform, or so as to be able to lay down around the pivot with the required width of the tip end edge of the stopper plate overlapping from the edge of the entrance to the loading surface of the platform, and so that the base end of the stopper plate is aligned with the edge of the entrance to hold the entrance in a closed state.

[0014] The stopper plate operating device for the stopper portion of the platform of an automobile lift may be configured such that a central pivot support base plate portion arranged on the back surface of the central portion of the stopper plate has a tip bearing hole for the treadmill link plate at a position midway between the base end and the tip end of the stopper plate, the tip shaft of the treadmill link plate is supported in this tip bearing hole and connected to the pivot support base plate portion, a base end shaft of the treadmill link plate is provided at the base end of the treadmill link plate, and the tip end of the second connecting rod is journaled and connected to this base end shaft of the treadmill link plate, and guide plates having guide holes that fit the base end shaft of the treadmill link plate and slide back and forth are arranged on the bottom support plate of the platform corresponding to both sides of the treadmill link plate. [Effects of the Invention]

[0015] The stopper plate operating device of the stopper part of the platform of the automobile lift of the present invention has the configuration of claim 1, so that the stopper part operates in response to the raising or lowering operation of the platform, and therefore the timing can be synchronized.

[0016] The stopper plate operating device of the stopper part in the platform of the automobile lift of the present invention has the configuration of claim 2, so that it can reliably transmit the operating force generated around the pivot supporting the base end of the platform to operate the stopper plate of the stopper part at the tip of the stopper platform.

[0017] The transmission mechanism for raising and lowering the stopper part of the stopper plate operating device of the stopper part in the platform of the automobile lift of the present invention is configured as in claim 3, so that the operating force generated around the pivot supporting the base end of the platform can be transmitted reliably and smoothly to operate the stopper plate of the stopper part at the tip end of the platform.

[0018] The stopper plate of the stopper section arranged at the tip of the platform is configured as described in claim 4, so that the pivot support plate section arranged on the back surface is pivotally supported by a pivot to the pivot support base plate section arranged on the bottom support plate, thereby ensuring reliable raising and lowering operation.

[0019] The stopper plate of the stopper section provided at the tip of the platform is configured as in claim 5, so that the pulling operation and the returning operation are received by the stopper plate, and the raising and lowering operation can be performed smoothly. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a schematic right side view of an automobile lift equipped with a stopper plate operating device for a stopper portion on a platform of the automobile lift of the present invention. FIG. [Figure 2] FIG. 10 is a left side view showing the stopper plate operating device of the stopper portion of the platform of the automobile lift of the present invention in operation when the platform is stored, when the loading platform is connected, and when the platform is lowered to the road surface, etc. [Figure 3] 1 is a left side view showing the stopper plate operating device of the stopper portion of the platform of the automobile lift of the present invention in relation to the operating state of the upper arm. FIG. [Figure 4] FIG. 10 is an enlarged partial left side view of the tilt link portion that tilts the platform. [Figure 5] FIG. 10 is a left side view showing the stopper plate operating device of the stopper portion of the platform of the automobile lift of the present invention in a tilt operating state after the platform has been lowered to the road surface. [Figure 6] 1 is a right side view showing the operating state of the hoisting cylinder when the platform of the car lift of the present invention is stored, when the loading platform is connected, and when the road surface is lowered. [Figure 7] This is a rear view of an automobile lift equipped with a stopper plate operating device for the stopper portion on the platform of the automobile lift of the present invention, showing the connected state of the upper arm, lower arm, and lifting cylinder when the platform is raised and the stopper plate operating device for the stopper portion is stored. [Figure 8] FIG. 1 is a top view of the platform showing the configuration of the stopper plate operating device of the stopper portion on the platform of the automobile lift of the present invention, with the loading surface of the platform cut away in a horizontal state when connected to the loading platform. [Figure 9] FIG. 9 is a left side cross-sectional view showing the configuration as seen from line II in FIG. 8. [Figure 10] FIG. 9 is a left side cross-sectional view showing the configuration as seen from line II-II in FIG. 8. [Figure 11] 10 is an enlarged top view of the central slope portion showing the second connecting rod and the connecting structure when the stopper plate of the stopper portion is in an upright position. FIG. [Figure 12] FIG. 12 is an enlarged left sectional view taken along line III-III in FIG. [Figure 13] 10 is an enlarged top view of the central slope portion showing the second connecting rod and the connecting structure when the stopper plate of the stopper portion is in a lying down position. FIG. [Figure 14] 14 is an enlarged left sectional view taken along line IV-IV in FIG. 13. [Figure 15] 10 is an enlarged left top view of the slope portion showing the bearing structure at the left end of the stopper plate of the stopper portion when the stopper plate is in an upright position. FIG. [Figure 16] 10 is an enlarged left top view of the slope portion showing the bearing structure at the left end of the stopper plate of the stopper portion when the stopper plate is in a laid-down state. FIG. [Figure 17] FIG. 12 is an enlarged side view of the right pivot support base plate shown in FIG. [Figure 18] 12 is an enlarged side view of the right guide plate alone shown in FIG. 11. [Figure 19] 1 is a front view showing the configuration of the stopper plate operating device of the stopper portion on the platform of the automobile lift of the present invention when the platform is in an upright stored state, with the loading surface of the platform cut away. FIG. [Figure 20] FIG. 20 is a cross-sectional left side view taken along line VV in FIG. 19. [Figure 21] FIG. 20 is a cross-sectional left side view taken along line VI-VI in FIG. 19. [Figure 22] This is a plan view showing the configuration of the stopper plate storage device for the stopper section of the platform of the present invention, with the platform's loading surface cut away when the platform has been lowered to the road surface and the stopper section has been stored. [Figure 23] 23 is a cross-sectional left side view showing the operating state of the configuration as seen from line VII-VII in FIG. 22. [Figure 24] 23 is a cross-sectional left side view showing the operating state of the configuration as seen from line VIII-VIII in FIG. 22. DETAILED DESCRIPTION OF THE INVENTION

[0021] In the car lift 3, the vehicle 2 side and the platform 4 side are connected by a parallel link of a left upper arm 8a and a right upper arm 8b, and a left lower arm 10a and a right lower arm 10b, which are arranged on the left and right sides, and the left tilt link 15a has a left tilt link upper pivot bearing hole 15a1 of which a tip shaft 16a1 is inserted and supported in the tip end 8a2 of the left upper arm 8a to connect the left upper arm 8a, and a left pivot shaft 14a1 inserted and supported in the left upper pivot bearing hole 13a1 arranged next to the left tilt link upper pivot bearing hole 15a1 at the top, and the tip shaft 14a2 of the left lower arm 10a is inserted and supported in the bottom. The left holding link 13a having the left lower support bearing hole 13a2, the right tilt link 15b having a right tilt link upper pivot bearing hole (not shown) that connects the tip end shaft of the right upper arm 8b by fitting it in and supporting it, and the right holding link 13b having a right pivot shaft 14b1 at its upper part that is fitted in and supported in an upper right pivot bearing hole (not shown) that is arranged next to the right tilt link 15b, and a right lower support bearing hole (not shown) at its lower part that fits in and supports the tip end shaft 14b2 of the right lower arm 10b. b1, and an operating shaft 19 is disposed across either the left holding link 13a or the right holding link 13b at a midpoint between the upper left pivot bearing hole 13a1 or the upper right pivot bearing hole (not shown) at the top and the lower left support bearing hole 13a2 or the lower right support bearing hole (not shown) at the bottom, and at a position spaced apart in the direction of the tip end 4b of the platform 4 from a straight line connecting the upper left pivot bearing hole 13a1 and the lower left support bearing hole 13a2 or the upper right pivot bearing hole (not shown) and the lower right support bearing hole (not shown). A stopper plate operating device for a stopper part on a platform of a car lift, in which one end of a transmission mechanism 21 that raises and lowers the stopper plate 6 of the topper part 5 is connected, and when the base end part 4a of the platform 4 rotates or rotates in the opposite direction around the left pivot 14a1 and the right pivot 14b1 from a horizontal state placed sideways on the loading platform 40 to a vertically stored and upright state, the transmission mechanism 21 connected to the operating shaft part 19 is moved by the movement difference of the base end part 4a of the platform 4 relative to the left holding link 13a and the right holding link 13b, thereby raising and lowering the stopper plate 6 of the stopper part 5.

[0022] The transmission mechanism 21 that raises and lowers the stopper plate 6 of the stopper portion 5 comprises a first operating rod 22 whose base end 22a is axially connected to the operating shaft portion 19 provided on the left holding link 13a, and is composed of a first L-shaped link 23 connected to the tip end 22b at the other end of this first operating rod 22, a stopper cylinder 24, an adjustment connecting rod 25, a second L-shaped link 26, and a second connecting rod 27.

[0023] The first operating rod 22 is disposed below the loading surface 4c of the platform 4, and its tip portion 22b is connected to one end 23a of a first L-shaped link 23 disposed below the loading surface 4c of the platform 4, and a base end 24a of a stopper cylinder 24 is axially connected to the other end 23b of the first L-shaped link 23, and a rod portion 24c accommodated in the base end 24a of the stopper cylinder 24 protrudes from the tip portion 24b of the stopper cylinder 24, and the rod portion 24c is The tip 24c1 of 4c is connected via an adjustable connecting rod 25 to one end 26a of a second L-shaped link 26 arranged under the loading surface 4c at a midpoint between the front and rear and left and right of the platform 4, and the second L-shaped link 26 converts the transmission direction from left and right to front and back and transmits it to the other end 26b, to which the base end 27a of a second connecting rod 27 is axially connected, and the tip 27b of the second connecting rod 27 is connected to the stopper plate 6 of the stopper portion 5.

[0024] The first actuating rod 22 pulls or pushes the first L-shaped link 23 connected to its tip end 22b by the amount of movement, causing it to rotate around the support shaft 23c, and this rotational movement is transmitted to the second linking rod 27 via the stopper cylinder 24, the adjustment linking rod 25, and the second L-shaped link 26. The base end shaft 36 of the elevation-raising linking plate connected to the tip end 27b of the second linking rod 27 is guided by the left guide hole 37a and the right guide hole 37b provided on the bottom support plate 30, and moves in the left elevation-raising direction. The connecting plate 35a and the right elevation / depression connecting plate 35b are pulled or pushed, and the stopper plate 6 to which the elevation / depression connecting plate tip shaft 34 is connected, which connects the tip end 35a2 of the left elevation / depression connecting plate 35a and the tip end 35b2 of the right elevation / depression connecting plate 35b, is caused to lie flat when the platform 4 is raised, stored, or rotated, centered on the central pivot 31c of the central pivot support base plate 33c, the left pivot 31a of the left pivot support base plate 33a, and the right pivot (not shown) of the right pivot support base plate (not shown).

[0025] The stopper portion 5 has an entrance 29 for passing a stopper plate 6 at the tip 4b of the platform 4, leaving a left end 4b1 and a right end 4b2 thereof, a bottom support plate 30 disposed below the inside of the entrance 29, and a central support plate portion 33c, a left end 33a and a right end (not shown) consisting of a pair of left and right support plates spaced apart from each other at a central portion 30c, a left end 30a and a right end 30b of the bottom support plate 30, respectively, and a central support plate portion 32c, a left end 32a and a right end (not shown) consisting of a left support plate and a right support plate are disposed on the back surface of the stopper plate 6 in correspondence with the central support plate portion 33c, left end 33a and right end (not shown) The stopper plates 6 are respectively rotatably disposed about a central pivot 31c, a left pivot 31a, and a right pivot (not shown), and the base end edge 6d of the stopper plate 6 is housed under the loading surface of the platform 4, and the stopper plates 6 are disposed in one of two states: upright about the central pivot 31c, the left pivot 31a, and the right pivot (not shown) and protruding above the loading surface 4c of the platform 4 with the tip end side of the stopper plate 6 as a collision part; and lying down about the central pivot 31c, the left pivot 31a, and the right pivot (not shown), with a required width of the tip end edge 6e of the stopper plate 6 overlapping from the edge of the entrance / exit 29 to the loading surface 4c of the platform 4, and the base end edge 6d of the stopper plate 6 coinciding with the edge of the entrance / exit 29, so that the entrance / exit 29 can be held in a closed state.

[0026] A left undulating connecting plate 35a having a left tip bearing hole and a right undulating connecting plate 35b having a right tip bearing hole are provided at the center shaft support plate portion 32c on the back surface of the center portion 6c of the stopper plate 6, at the intermediate position between the base end edge 6d and the tip edge 6e of the stopper plate 6. The undulating connecting plate tip shaft 34 is supported and connected to the left tip bearing hole and the right tip bearing hole. A undulating connecting plate is provided at the base end portion 35a1 of the left undulating connecting plate 35a and the base end portion 35b1 of the right undulating connecting plate 35b. A plate base end shaft 36 is provided across the platform, and the tip end 27b of the second connecting rod 27 is pivotally supported and connected to this base end shaft 36 of the hoisting connecting plate. A left guide plate 38a having a left guide hole 37a that fits over the base end shaft 36 of the hoisting connecting plate to slide it back and forth, and a right guide plate 38b having a right guide hole 37b are arranged on the bottom support plate 30 of the platform 4 corresponding to the inside of the left hoisting connecting plate 35a and right hoisting connecting plate 35b. [Example]

[0027] Hereinafter, a stopper plate operating device for a stopper portion on a platform of an automobile lift according to the present invention will be described based on a stopper plate operating device 1 for a stopper portion on a platform of an automobile lift as an embodiment shown in Figs.

[0028] In the figure, 2 is a vehicle, 3 is a car lift, 4 is a platform, 5 is a stopper part, and 6 is a stopper plate. Here, in this specification, the left side of platform 4 refers to the left side from the base end of platform 4 toward its tip, and the opposite right side of platform 4 refers to the right side when looking from the base end of platform 4 toward its tip. Furthermore, the opposite side when looking from the base end of platform 4 toward the tip is called the front, and conversely, the opposite side when looking from the tip to the base end is called the back. Furthermore, the same applies to stopper plate 6 and other components provided on stopper part 5 of platform 4. In addition, with respect to the front and rear of vehicle 2, the left side when viewed from the front to the rear is referred to as the left side, and similarly, the right side when viewed from the front to the rear is referred to as the right side. Furthermore, the opposite side when viewed from the front to the rear of vehicle 2 is referred to as the front, and conversely, the opposite side when viewed from the rear to the front is referred to as the rear.

[0029] A mounting frame 7 is provided on the underside of a rear frame 2a of the vehicle 2, and a left bearing portion 7a1 is provided on the left side surface 7a of the mounting frame 7, and a right bearing portion 7b1 is provided on the opposite right side surface 7b.

[0030] The left bearing portion 7a1 is provided in the following manner: an upper-left inner base end bearing portion 7a11 that supports the base end portion 8a1 of the left upper arm 8a by a base end shaft 9a1 is provided on the upper left side surface; a middle-left outer base end bearing portion 7a12 that supports the base end portion 10a1 of the left lower arm 10a by a base end shaft 9a2 is provided on the central raised portion of the left side surface; and a lower-left lower inner base end bearing portion 7a13 that supports the base end portion 11a11 of the left cylinder portion 11a1 of the left lift-down cylinder 11a by a base end shaft 9a3 is provided on the lower left side surface, corresponding to the upper-left inner base end bearing portion 7a11 in the vertical direction.

[0031] The right bearing portion 7b1 is provided in the following manner: an upper right inner base end bearing portion 7b11 that supports the base end portion 8b1 of the right upper arm 8b by a base end shaft 9b1 is provided on the upper right side surface; a middle right outer base end bearing portion 7b12 that supports the base end portion 10b1 of the right lower arm 10b by a base end shaft 9b2 is provided on the central raised portion of the right side surface; and a lower right lower inner base end bearing portion 7b13 that supports the base end portion 11b1 of the right cylinder portion 11b1 of the right lift-down cylinder 11b by a base end shaft 9b3 is provided on the lower right side surface, corresponding to the upper right inner base end bearing portion 7b11 in the vertical direction.

[0032] In the embodiment of the stopper plate operating device of the stopper part of the platform of the automobile lift of the present invention, the left lifting cylinder 11a and the right lifting cylinder 11b use double-acting cylinders, but if a tilt link is not installed on the platform, a single-acting cylinder with a return spring may also be used.

[0033] The platform 4 has a left side bearing portion 4a1 and a right side bearing portion 4a2 at its base end portion 4a, which correspond to the left bearing portion 7a1 on the left side surface 7a of the mounting frame 7 and the right bearing portion 7b1 on the right side surface 7b.

[0034] When the platform 4 is in a horizontal position, the left side bearing portion 4a1 has a first left bracket 12a1, a second left bracket 12a2 and a third left bracket 12a3 projecting inward from the outer left surface at a predetermined interval.

[0035] Similar to the left side bearing portion 4a1, the right side bearing portion 4a2 has a right first bracket 12b1, a right second bracket 12b2 and a right third bracket 12b3 protruding inward at a predetermined interval from the right outer surface when the platform 4 is in a horizontal position.

[0036] A single left pivot shaft 14a1 is disposed between the first left bracket 12a1 and the second left bracket 12a2 and between the second left bracket 12a2 and the third left bracket 12a3, and a left retaining link 13a is disposed between the first left bracket 12a1 and the second left bracket 12a2, with the left pivot shaft 14a1 inserted into an upper left pivot bearing hole 13a1 provided at the top, and the left retaining link 13a is connected to both side surfaces of the tip end 10a2 of the left lower arm 10a, and a left lower arm tip shaft 14a2 is inserted into a lower left support bearing hole 13a2 provided at the bottom, connecting the left retaining link 13a and the left lower arm 10a.

[0037] A single right pivot shaft 14b1 is disposed so as to span between the right first bracket 12b1 and the right second bracket 12b2 and between the right second bracket 12b2 and the right third bracket 12b3, and a right retaining link 13b is disposed between the right first bracket 12b1 and the right second bracket 12b2, with the right pivot shaft 14b1 inserted into an upper right pivot bearing hole (not shown) provided in the upper section of the right retaining link 13b, and the right retaining link 13b is connected to both side surfaces of the tip end 10b2 of the right lower arm 10b, and a right lower arm tip shaft 14b2 is inserted into a right lower support bearing hole (not shown) provided in the lower section of the right retaining link 13b, thereby connecting the right retaining link 13b and the right lower arm 10b.

[0038] Between the left second bracket 12a2 and the left third bracket 12a3, left tilt link 15a is connected to both side surfaces of tip portion 8a2 of left upper arm 8a, and the left pivot shaft 14a1 is inserted into left tilt link upper pivot bearing hole 15a1 provided at the upper part of left tilt link 15a to be pivotally mounted. Left upper arm tip bearing hole 15a2 of tip portion 8a2 of left upper arm 8a, into which tip shaft 16a1 is inserted, is provided at the upper part of left tilt link 15a adjacent to left tilt link upper pivot bearing hole 15a1, and left rod tip bearing hole 15a3 is provided at the lower part, into which left rod tip shaft 16a2 of tip portion 11a21 of left rod portion 11a2 is inserted and connected.

[0039] A left engagement groove 15a41 is provided in the base end edge 15a4 of the left tilt link 15a, which connects to the tip end 8a2 of the left upper arm 8a. A left tilt lock 17a facing the left engagement groove 15a41 is pivotally supported by a left support shaft 17a3 on one side of the left upper arm 8a so as to be lockable.

[0040] A left biasing spring 17a1 is provided between the left tilt link 15a and the left tilt lock 17a, and biases the left tilt lock 17a so as to engage with the left engagement groove 15a41.

[0041] A left release roller 17a2 is mounted on the side of the tip end 10a2 of the left lower arm 10a that corresponds to the left tilt lock 17a, and when the platform 4 descends to the road surface 39, the relative movement of the left upper arm 8a and the left lower arm 10a moves the left release roller 17a2, causing the left tilt lock 17a to rotate around the left support shaft 17a3 by pulling the left biasing spring 17a1 in the direction opposite to the biasing direction, thereby disengaging the tip end of the left tilt lock 17a from the left engagement groove 15a41 and automatically releasing the lock between the left upper arm 8a and the left tilt link 15a.

[0042] Between the right second bracket 12b2 and the right third bracket 12b3, a right tilt link 15b having a right engagement groove with a structure similar to that of the left tilt link 15a is provided.

[0043] The right tilt lock for the right tilt link 15b is provided with a right biasing spring having the same structure as the left tilt lock 17a, and biases the right tilt lock so as to engage with the right engagement groove.

[0044] A right release roller (not shown) is mounted on the side of the tip end 10b2 of the right lower arm 10b corresponding to the right tilt lock 17b in the same structure as the left tilt link 15a, and when the platform 4 descends to the road surface 39, the relative movement of the right upper arm 8b and the right lower arm 10b moves the right release roller (not shown), causing the right tilt lock (not shown) to rotate around the support shaft by pulling the right biasing spring (not shown) in the direction opposite to the biasing direction, thereby disengaging the tip end of the right tilt lock (not shown) from the right engagement groove (not shown), and automatically releasing the lock between the right upper arm 8b and the right tilt link 15b. Note that 11b2 is a right rod portion, and 11b21 is a tip end.

[0045] In this embodiment, as shown in FIG. 6, a single-acting push cylinder type elevation cylinder 18 with a return spring is provided between the right holding link 13b and the platform 4, and can move the platform 4 to a horizontal state where it is connected to the loading platform 40 and to a vertical storage state from that state.

[0046] In the automobile lift 1 used in the embodiment, when the platform 4 is lowered to the road surface 39 by rotating the platform 4 from a horizontal plane to an inclined plane to facilitate loading and unloading of a cart onto the loading surface 4c, as described above, the left tilt lock 17a for the left tilt link 15a and the right tilt lock (not shown) for the right tilt link 15b are each released, so that the left lifting cylinder 11a and the right lifting cylinder 11b can be retracted and rotated from the position shown in Figure 3 to the position shown in Figure 5.

[0047] In conventional car lifts, the top surface of the platform is equipped with a stopper that collides with the casters of the cart and prevents it from falling off the platform. Therefore, when conventional platforms are stored in the trunk, the stopper plate of the stopper is left protruding, and the stopper plate of the stopper protrudes into the trunk, which can come into contact with workers inside the trunk and cause injury.

[0048] The present invention has devised a stopper plate operating device for the stopper part on the platform of a car lift, which uses a link linked to the raising and storing operation or horizontal deployment operation of the platform 4 to lower or raise the stopper plate 6 of the stopper part 5 during the raising and storing operation or horizontal deployment operation, and in particular, which folds down the stopper plate 6 of the stopper part 5 on the platform 4 during the raising and storing operation.

[0049] In the left holding link 13a when the platform 4 is connected to the loading platform 40 of the vehicle 2 in a horizontal state, an operating bearing hole 20 for bearing an operating shaft portion 19, which serves as a power source, is provided at a position intermediate between the left upper pivot bearing hole 13a1, into which the left pivot shaft 14a1 is inserted, and the left lower support bearing hole 13a2, which bears the left lower arm tip shaft 14a2, and at a position spaced from this toward the tip of the platform 4.

[0050] The actuation shaft 19 on the left holding link 13 a and the stopper plate 6 of the stopper portion 5 are connected by a transmission mechanism 21 .

[0051] The transmission mechanism 21 is made up of a first operating rod 22, a first L-shaped link 23, a single-acting push cylinder type stopper cylinder 24 with a return spring, an adjustment connecting rod 25, a second L-shaped link 26, and a second connecting rod 27.

[0052] The first operating rod 22 is entirely positioned below the loading surface 4c inside the left edge 4d1 of the platform 4, and its tip 22b is connected to one end 23a of the first L-shaped link 23, which is also positioned below the loading surface 4c on the same side of the platform 4. The base end 24a of the stopper cylinder 24 is axially connected to the other end 23b of the first L-shaped link 23, and a rod portion 24c equipped with a piston (not shown) at the base end that is inserted into the stopper cylinder 24 protrudes from the tip end 24b of the stopper cylinder 24, the tip end of the rod portion 24c is connected to the adjustment connecting rod 25 and connected to one end 26a of a second L-shaped link 26 arranged on the loading surface 4c at a position midway between the front and rear and the left and right of the platform 4, the transmission direction is changed from the left and right to the front and back direction and transmitted to the other end 26b, and the base end 27a of a second connecting rod 27 is axially connected to the other end 26b, and the tip end 27b of the second connecting rod 27 is connected to the stopper plate 6 of the stopper portion 5.

[0053] At the tip 4b of the platform 4, the entrance 29 of the stopper plate 6 of the stopper portion 5 is opened, leaving the required widths of the left end 4b1 and the right end 4b2 on the loading surface 4c of the platform 4.

[0054] A bottom support plate 30 is arranged below the inside of the entrance / exit 29, and a central support plate portion 32c provided on the back surface of the central portion 6c of the stopper plate 6, a left support plate portion 32a provided on the left end portion 6a of the stopper plate 6, and a right support plate portion (not shown) provided on the right end portion (not shown) of the stopper plate 6 are respectively provided on the bottom support plate 30 with corresponding central support base plate portions 33c, left support base plate portions 33a, and right support base plate portions (not shown).

[0055] The central support plate portion 32c has a left support plate 32c2 and a right support plate 32c3 that connect to the upper edge of a top plate portion 32c1, which is connected and fixed to the back surface of the central portion 6c of the stopper plate 6 of the stopper portion 5, at a distance to the left and right, and these left support plate 32c2 and right support plate 32c3 have a left pivot bearing hole (not shown) and a right pivot bearing hole (not shown) that are provided on the same axis corresponding to the base end of the stopper plate 6.

[0056] Similar to the central support plate portion 32c, the left side support plate portion 32a has a left support plate 32a2 and a right support plate 32a3 that connect to the upper edge of a top plate portion 32a1, which is connected to the underside of the left end portion 6a of the stopper plate 6 of the stopper portion 5, at a distance to the left and right, and these left support plate 32a2 and right support plate 32a3 have a left pivot bearing hole (not shown) and a right pivot bearing hole (not shown) that are provided on the same axis in correspondence with the base end of the stopper plate 6.

[0057] The right side pivot support plate portion (not shown) is provided in the same manner as the left side pivot support plate portion 32a.

[0058] The central support base plate portion 33c is provided with a left support base plate 33c1 connected to the left support plate 32c2 of the central support plate portion 32c from the inside, and a right support base plate 33c2 connected to the right support plate 32c3 of the central support portion 32c from the inside. A left pivot bearing hole (not shown) and a right pivot bearing hole (not shown) are provided in correspondence with the base end of the stopper plate 6.

[0059] The left side support plate portion 33a is provided with a left support plate 33a1 connected to the left support plate 32a2 of the left side support plate portion 32a from the inside, and a right side bearing plate 33a2 connected to the right support plate 32a3 of the left side support plate portion 32a from the inside. A left pivot bearing hole (not shown) and a right pivot bearing hole (not shown) are provided in correspondence with the base end of the stopper plate 6.

[0060] Although not shown, the right side pivot support base plate is provided in the same manner as the left side pivot support plate 33a.

[0061] The central support plate portion 33c, the left support plate portion 33a and the right support plate portion on the bottom support plate 30, which pivotally support the central support plate portion 32c, the left support plate portion 32a and the right support plate portion (not shown) of the stopper plate 6, are pivotally supported by a central pivot 31c, a left pivot 31a and a right pivot (not shown) on the same axis.

[0062] The central support plate portion 32c provided in the central portion 6c of the stopper plate 6 has a left support plate 32c2 and a right support plate 32c3, with a relief connecting plate tip shaft 34 extending between the base end and the tip end, and the relief connecting plate tip shaft 34 bearing-connects the tip end 35a2 of the left relief connecting plate 35a and the tip end 35b2 of the right relief connecting plate 35b.

[0063] A hoisting link plate base end shaft 36 is installed to span between the base end 35a1 of the left hoisting link plate 35a and the base end 35b1 of the right hoisting link plate 35b, and the tip end 27b of the second link rod 27 is journaled and connected to the hoisting link plate base end shaft 36. A left guide plate 38a having a left guide hole 37a that fits onto the hoisting link plate base end shaft 36 and a right guide plate 38b having a right guide hole 37b that slides back and forth are provided at the tip end 4b of the platform 4 corresponding to the inside of the left hoisting link plate 35a and right hoisting link plate 35b, respectively.

[0064] The stopper plate 6 of the stopper section 5 arranged at the tip 4b of the platform 4 is arranged in an operational state in which the tip side of the stopper plate 6 protrudes above the loading surface 4c of the platform 4 as a collision part, or in an operational state in which the stopper plate 6 is laid down around the central pivot 31c, left pivot 31a and right pivot (not shown) of the central pivot base plate section 33c, left side pivot base plate section 33a and right side support section (not shown), and the tip edge 6e is overlapped from the edge of the entrance / exit 29 onto the loading surface 4c of the platform 4, so that the entrance / exit 29 can be stored in a closed state.

[0065] The embodiment of the stopper section stopper plate operating device 1 according to the present invention, which operates in conjunction with the opening and closing operation of the platform 4, is configured as described above, so that when the loading surface 4c of the platform 4 is aligned with the loading surface of the loading platform 40, the transmission mechanism 21, which is composed of the first operating rod 22, the first L-shaped link 23, the stopper cylinder 24, which is a single-acting push cylinder (with return spring), the adjustment connecting rod 25, the second L-shaped link 26 and the second connecting rod 27, is operated, and the stopper plate 6 of the stopper section 5 is in an upright state.

[0066] Next, when the platform 4 is raised vertically and stored with the stopper plate 6 of the stopper portion 5 raised in this manner, that is, when the platform 4 is rotated 90 degrees about the left pivot 14a1 and right pivot 14b1 of its base end 4a and raised, the left holding link 13a and the right holding link 13b are stationary because the left lift cylinder 11a and the right lift cylinder 11b are not operating, and therefore the operating shaft 19 of the left holding link 13a also maintains its position. Therefore, the first operating rod 22 pulls the first L-shaped link 23, to which the tip end portion 22b is connected, and rotates it about the support shaft 23c by the amount that the platform 4 has moved upward by a rotation angle of 90 degrees. This rotational movement of the stopper cylinder 24, the second L-shaped link 26, and the tip 27b of the second connecting rod 27 causes the connecting hoisting link plate base end shaft 36 to be guided by the left guide hole 37a and the right guide hole 37b, pulling and moving the left hoisting link plate 35a and the right hoisting link plate 35b, and causes the stopper plate 6 to which the hoisting link plate tip shaft 34 is connected, to lie down about the central pivot 31c, left pivot 31a, and right pivot (not shown) of the central pivot support base plate 33c, the left pivot support base plate 33a, and the right support base (not shown), and the front end edge overlaps with the edge of the entrance 29 and the loading surface 4c of the platform 4, thereby storing the entrance 29 in a closed state. Therefore, when the platform 4 is stored upright, the stopper plate 6 of the stopper portion 5 follows and lies down.

[0067] Next, when the platform 4 is deployed horizontally from the upright stored state, the first operating rod 22 performs a pushing operation in the opposite direction to the above operation, rotating the stopper plate 6 in the direction of standing up the stopper plate 6 of the stopper part 5 around the central pivot 31c, left pivot 31a and right pivot (not shown) on the same axis of the central pivot support base plate part 33c, left pivot support base plate part 33a and right support base part (not shown).As a result, the stopper plate 6 of the stopper part 5 stands up.

[0068] Next, when it is desired to lower the stopper plate 6 of the stopper section 5 of the platform 4 to the road surface 39 with the stopper plate 6 of the stopper section 5 raised, as shown in Fig. 18, since the stopper cylinder 24 is a single-acting push cylinder with a return spring, the valve is opened to release the hydraulic pressure, and the piston moves toward the base end, which is the inside of the stopper cylinder 24, and the movement of the rod section 24c is transmitted from the adjustment connecting rod 25 to the second L-shaped link 26 and the second connecting rod 27, and pulled, resulting in an operation similar to that in which the stopper section 5 is lowered and rotated when the platform 4 is raised and stored. Therefore, the stopper section 5 is lowered, eliminating the obstruction to the casters, and passengers can get on and off the platform 4.

[0069] Next, when it is desired to raise the stopper part 5 with or without luggage on the platform 4, hydraulic pressure is applied to the rod of the stopper cylinder 24 in the opposite direction to the tilting direction, moving the second connecting rod 27 toward the tip part 27b, transmitting the force to the second L-shaped link 26 and the second connecting rod 27, and pushing out the stopper part 5, raising the stopper part 5. As the stopper part 5 rises, it becomes an obstacle to the casters and prevents the platform 4 from falling off.

[0070] With the platform 4 maintained horizontally, the left lifting cylinder 11a and the right lifting cylinder 11b are operated to lift the platform 4 from its lowered state in contact with the road surface 39 to its upper limit position, where it stops, and luggage can be loaded from the platform 4 into the loading platform 40 of the vehicle 2, or conversely, luggage on the loading platform 40 of the vehicle 2 can be loaded onto the platform 4.

[0071] The stopper plate operating device of the stopper part on the platform of the automobile lift of the present invention is configured as described above, so that the stopper part is automatically folded down and stored in conjunction with the storage and raising operation of the platform, thereby ensuring the safety of the luggage compartment and personnel in the vehicle cabin.

[0072] The stopper plate operating device of the stopper part on the platform of the automobile lift of the present invention is used not only for luggage but also for welfare lifts, which also leads to improved safety for people requiring assistance and their attendants inside the welfare vehicle. [Industrial Applicability]

[0073] The stopper plate operating device of the stopper portion on the platform of the automobile lift according to the present invention contributes to improving the safety of logistics workers. [Explanation of symbols]

[0074] 1. Stopper plate operating device for the stopper part on the platform of a car lift 2 vehicles 2a frame 3. Car lifts 4 Platform 4a Proximal end 4a1 Left side bearing part 4a2 Right side bearing part 4b Tip 4b1 Left end 4b2 Right side end 4c Loading surface 4d1 left edge 5 Stopper 6 Stopper plate 6a Left end 6c central part 6d Proximal edge 6e Tip edge 7 Mounting frame 7a Left side 7a1 Left bearing part 7a11 Upper left inner proximal bearing part 7a12 Left middle row outer base end bearing part 7a13 Lower left inner proximal bearing part 7b Right side 7b1 Right bearing part 7b11 Upper right inner base end bearing 7b12 Right middle outer base end bearing 7b13 Lower right inner base end bearing part 8a Left upper arm 8a1 Proximal end 8a2 Tip 8b Right upper arm 8b1 Proximal end 9a1 Proximal axis 9a2 Proximal axis 9a3 Proximal axis 9b1 Proximal axis 9b2 Proximal axis 9b3 Proximal axis 10a Left lower arm 10a1 Proximal end 10a2 Tip 10b Right lower arm 10b1 Proximal end 10b2 Tip 11a Left lift cylinder 11a1 Left cylinder part 11a11 Proximal end 11a2 Left rod part 11a21 Tip 11b Right lift cylinder 11b1 Right cylinder part 11b11 Proximal end 11b2 Right rod part 11b21 Tip 12a1 Left 1st bracket 12a2 Left second bracket 12a3 Left third bracket 12b1 Right 1st Bracket 12b2 Right 2nd Bracket 12b3 Right Third Bracket 13a Left retaining link 13a1 Upper left pivot bearing hole 13a2 Lower left support bearing hole 13b Right retaining link 14a1 Left Axis 14a2 Left lower arm tip shaft 14b1 Right Axis 14b2 Right lower arm tip shaft 15a Left tilt link 15a1 Left tilt link upper pivot bearing hole 15a2 Left upper arm tip bearing hole 15a3 Left rod tip bearing hole 15a4 Left tilt link base edge 15a41 Left engagement groove 15b Right tilt link 16a1 Left upper arm tip shaft 16a2 Left rod end shaft 16b1 Right upper arm tip axis 16b2 Right rod end shaft 17a Left tilt lock 17a1 Left bias spring 17a2 Left release roller 17a3 Left support shaft 18. Drilling cylinder 19 Actuation shaft 20 Operating bearing hole 21 Transmission Mechanism 22 First operating rod 22a Proximal end 22b Tip 23 First L-shaped link 23a One end 23b Other end 23c spindle 24 Stopper cylinder 24a Proximal end 24b Tip 24c rod section 24c1 Tip 25 Adjustable connecting rod 26 Second L-shaped link 26a One end 26b Other end 27 Second connecting rod 27a Proximal end 27b Tip 29 Entrance / Exit 30 Bottom support plate 30a Left end 30c central part 31a Left Pivot 31c Central Axis 32a Left side shaft support plate 32a1 Top plate 32a2 Left pivot support plate 32a3 Right shaft support plate 32c Central shaft support plate 32c1 Top plate 32c2 Left pivot support plate 32c3 Right shaft support plate 33a Left side shaft support plate 33a1 Left support plate 33a2 Right axis support plate 33c Central shaft support plate part 33c1 Left support plate 33c2 Right axis support plate 34 End shaft of undulation connecting plate 35a Left undulating connection plate 35a1 Proximal end 35a2 Tip 35b Right undulation connection plate 35b1 Proximal end 35b2 Tip 36 Base axis of undulation connecting plate 37a Left guide hole 37b Right guide hole 38a Left guide plate 38b Right guide plate 39 Road surface 40 Cargo bed

Claims

1. In an automobile lift in which the vehicle side and the platform side are connected by a parallel link made of upper arms and lower arms arranged on the left and right, retaining links are arranged on the left and right, each having an upper pivot bearing hole at its upper part for inserting and supporting a pivot shaft that is inserted and supported in the upper pivot bearing hole of the tip shaft of the upper arm or the upper pivot bearing hole of the tilt link connected thereto, and a lower support bearing hole at its lower part for inserting and supporting the tip shaft of the lower arm, and a retaining link on one side is provided at a position intermediate between the upper upper pivot bearing hole on the upper side and the lower lower support bearing hole on the lower side, and connecting the upper pivot bearing hole and the lower support bearing hole. A stopper plate operating device for a stopper part on a platform of a car lift, in which an operating shaft is disposed across the platform at a position spaced from a straight line toward the tip of the platform, and one end of a transmission mechanism that raises and lowers the stopper plate of the stopper part is connected to the operating shaft, so that when the platform rotates around the pivot from a horizontal state placed sideways on the loading platform to a vertically stored upright state or conversely to a horizontal state, the difference in movement of the left and right holding links at the base end of the platform activates the transmission mechanism connected to the operating shaft to raise and lower the stopper plate of the stopper part.

2. The transmission mechanism for raising and lowering the stopper plate of the stopper portion comprises at least a first operating rod, one end of which is pivotally connected to an operating pivot point provided on the retaining link, and a first L-shaped link, a stopper cylinder, an adjustment connecting rod, a second L-shaped link, and a second connecting rod connected to the first operating rod.

3. 2. A stopper plate operating device for a stopper part on a platform for a car lift according to claim 1 or 2, wherein the tip of the second connecting rod of the transmission mechanism that operates to raise and lower the stopper plate of the stopper part on the platform operates to pull or push the rise and lower link plate by guiding the base end shaft of the connecting rise and lower link plate through a guide hole provided on a bottom support plate provided below the loading surface of the platform, and the stopper plate to which the tip shaft provided on the tip of the rise and lower link plate is connected operates to lower the stopper plate about the pivot axis of each support base plate part provided on the bottom support plate when the platform is rotated to raise and store, and operates to raise the stopper plate when the platform is rotated to raise and store, and in the opposite direction, to raise the stopper plate when it is rotated to horizontally deploy.

4. An entrance for the stopper plate of the stopper section is provided at the tip of the platform, leaving the left and right side ends, and a bottom support plate is provided below the inside of the entrance, and support plate sections consisting of a pair of pivot support base plates spaced apart from each other are provided at the center, left side, and right side of the bottom support plate, and pivot support plate sections consisting of a left pivot support plate and a right pivot support plate corresponding to each pivot support base plate section are provided on the back surface of the stopper plate so as to be rotatable by each pivot, and the base end of the stopper plate is accommodated under the loading surface of the platform.

3. The stopper plate operating device for the stopper portion on the platform of a car lift according to claim 1 or 2, wherein the stopper plate is arranged so as to be able to hold the stopper plate in one of two states: upright about the pivot with the tip end of the stopper plate as the collision portion and protruding above the loading surface of the platform; and lying down about the pivot with the required width of the tip edge of the stopper plate overlapping from the edge of the entrance to the loading surface of the platform, and the base end of the stopper plate coinciding with the edge of the entrance to close the entrance.

5. 3. The stopper plate operating device for the stopper portion of the platform of an automobile lift according to claim 1 or 2, wherein a central pivot support base plate portion arranged on the back surface of the central portion of the stopper plate is provided with a tip bearing hole for the treadmill link plate at a position midway between the base end and the tip end of the stopper plate, and the tip shaft of the treadmill link plate is supported in this tip bearing hole and connected to the pivot support base plate portion, and a base end shaft of the treadmill link plate is provided at the base end of the treadmill link plate, and the tip end of the second connecting rod is journaled and connected to this base end shaft of the treadmill link plate, and guide plates having guide holes that fit the base end shaft of the treadmill link plate and slide back and forth are arranged on the bottom support plate of the platform corresponding to both sides of the treadmill link plate.

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