Banister derricking operation device in platform of lift for automobile

Abstract

To provide a banister derricking operation device of 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, wherein the platform is pivoted to freely derrick by an upper arm for bearing a derrick shaft on a front surface of its base end to a tip end bearing hole of an upper arm or a connection hole of a tilt link connected to the tip bearing hole, and a bearing link which inserts the derrick shaft to the upper bearing hole and supports a supporting shaft of a tip of a lower arm on a lower bearing hole, in the one bearing link, a derrick difference operation shaft is arranged at a position which is an intermediate position between one pivot receiving hole on the upper side and one supporting shaft receiving hole on the lower side, and is separated in a tip direction of the platform rather than a straight line connecting the one pivot receiving hole and the one supporting shaft receiving hole, one end of a transmission connection mechanism for derricking a handrail is connected to the derrick difference operation shaft, the transmission connection mechanism connected to the derrick difference operation shaft is operated, and the handrail arranged on a cargo deck surface of the platform is derricked and operated.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a platform handrail operating device that rises and falls in conjunction with the opening and closing operation of the platform of a car lift. [Background technology]

[0002] Patent Document 1 aims to provide a lift that allows handrails to be used whenever necessary, but that does not get in the way when not in use. The lift is equipped with a moving mechanism that moves the platform 5 from the opening of the vehicle to the outside of the vehicle while maintaining the platform 5 in a horizontal position, and is equipped with side plates 10 that stand perpendicular to the platform on both sides of the platform in the width direction, and handrails 12 consisting of grips 12a and legs 12b, with the lower parts of the handrail legs 12b attached to the platform surface inside the side plates via a rotation mechanism 15, and is equipped with fixing mechanisms 21 and 22 that fix the legs 12b to the side plates 10 when the handrail legs 12b stand perpendicular to the platform 5, and is sized so that the entire handrail fits between the two side plates when the handrail is folded down onto the platform.

[0003] Patent Document 2 proposes an invention in which the handrail 70 is intended to be automatically put into use or stored state in conjunction with the folding operation of the platform, and the handrail is composed of a handrail arm 71 attached to the middle part of the side frame 30 at its base end so that it can rotate up and down, and a handrail support 72 attached to the side end of the platform 20 at its base end so that it can rotate up and down, and whose tip is rotatably connected to the tip of the handrail arm 71.

[0004] In Patent Document 3, the timing at which a handrail 40 provided on a lifting platform 10 that can be raised and lowered is folded into a lowered state is set earlier than the timing at which the lifting platform 10 closes, thereby eliminating the inconvenience of the handrail 40 coming into contact with cargo inside the vehicle cabin. The device is provided with a handrail 40 that can be raised and lowered relative to the lifting platform 10 pivotally attached to a lifting link 5, and a handrail raising and lowering mechanism 50. The handrail raising and lowering mechanism 50 has a small arm 51 that rotates integrally with the handrail 40, and a small arm 52 that is attached to the lifting link 5 at one end. A lifting device with a handrail raising and lowering mechanism has been proposed, which has a first link 61 to which a portion is pivotally attached, a lever 55, a second link 62 having one end connected to the other end of the first link 61 and the other end connected to one end of the lever 55, and a third link 63 connecting the other end of the lever 55 to the tip of the minor arm 51, and when the platform 10 closes, the first link 61 maintains a constant posture relative to the lifting link 5 until the handrail 40 is laid down relative to the platform 10 by the spring 53. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-104055 [Patent Document 2] Japanese Utility Model Application Publication No. 07-331 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-184555 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0006] In Patent Document 1, the handrail can be easily set up when needed and stored in a place where it won't get in the way when not in use, but it has the drawback that the user must assemble and store it themselves.

[0007] In Patent Document 2, when the platform is deployed horizontally in its usable state, the handrail is automatically deployed, which is very convenient, but when it is stored, the handrail arm 71 and handrail support 72 are folded in parallel, and when stored, the handrail rises high, so much so that if the front-to-back length is suitable for the platform, it will reach the ceiling of the vehicle compartment, which is a drawback.

[0008] The structure of Patent Document 3 is as described above, and therefore has the drawback that the traction force of the spring 53 acts to keep the lifting platform 10 horizontal with respect to the lifting link 5 at all times.

[0009] 16, in the handrail raising and lowering device for a lifting platform of Patent Document 3, when the angle between the road surface of the car body 1 and the road surface of the platform 10 differs, the angles at which the car body 1 and the lifting platform 10 are supported differ, and a gap occurs between the back surface of the support link 5 on the car body 1 side and the front surface of the base end of the lifting platform 10. The first link 61 pulls the small arm 51 by the length that creates this gap, causing the handrail 40 to fall down. 17, if there is a difference in level between the sidewalk and the road surface, the tip of the lifting platform 40 touches the sidewalk surface and the base end of the platform 10 touches the road surface, causing the tip of the platform 10 to tilt upward, tilting the front of the base end of the lifting platform 10 and creating a gap between it and the back of the support link 5. The first link 61 pulls the small arm 51 by the length that creates this gap, causing the handrail 40 to fall down.

[0010] The handrail raising and lowering operating device for the platform of an automobile lift of the present invention is designed to maintain the handrail in an upright deployed state even in the above-mentioned situation once the handrail is deployed, regardless of the inclination of the platform or the inclination of the vehicle's support link.

[0011] If the handrail is opened at the same time as the platform stored in the vehicle cabin begins to deploy horizontally, it will open inside the vehicle cabin, which could hit someone inside and cause injury. Therefore, the handrail must be deployed when the platform is outside the vehicle cabin.

[0012] Furthermore, even when the platform is rotated from a horizontal position to a storage position, the handrail is not lowered at the same time as the platform rotates to a storage position, but the platform is raised to the required storage position and then the handrail 33 is rotated downward, with the aim of reducing the danger to the surrounding area when the platform is initially raised and stored. [Means for solving the problem]

[0013] In an automobile lift, the vehicle side and the platform side are connected by parallel links of left and right upper arms and left and right lower arms, and the platform is provided with a left pivot shaft and a right pivot shaft, which serve as the platform's up and down shaft, respectively, on the upper left and right ends of the front of the base end in a horizontal position. The left pivot shaft is inserted into the left tip bearing hole of the left upper arm or the left pivot bearing hole of the left tilt link connected thereto and is supported by the left upper arm, and the right pivot shaft is The left pivot shaft has a left support link fitted into a left upper pivot bearing hole provided at the top thereof and supported thereon, and a left tip support shaft disposed across a left lower tip support bearing hole provided at the bottom thereof, with the left tip of the left lower arm being supported by the left support link. The right pivot shaft has a right support link fitted into a right upper pivot bearing hole provided at the top thereof and supported thereon, and a right tip support shaft disposed across a left lower tip support bearing hole provided at the bottom thereof, with the left tip of the left lower arm being supported by the left support link. a right lower arm having a right end support shaft disposed across a right lower support hole provided in the left support link and a right lower arm having a right end support shaft disposed across the right lower support hole; and a relief differential operating shaft disposed across the left support link or the right support link at a midpoint between the upper left pivot bearing hole or the upper right pivot bearing hole on the upper side thereof and the lower left end support bearing hole or the lower right end support bearing hole on the lower side thereof, and at a position separated toward the end of the platform from a straight line connecting the upper left pivot bearing hole or the upper right pivot bearing hole and the lower left end support bearing hole or the lower right end support bearing hole; This handrail raising and lowering operating device for a car lift platform has one end of a transmission linkage mechanism that raises and lowers the handrails, connected to the differential operating shaft, so that when the platform rotates around the left or right pivot shaft from a horizontal position laid sideways on the loading platform surface to a vertical stored and erected position, or conversely, rotates from a stored and erected position to a horizontal position, the difference in movement of the base end of the platform relative to the left or right support link activates the transmission linkage mechanism connected to the differential operating shaft, thereby raising and lowering the handrails arranged on the loading platform surface of the platform.

[0014] A base end connecting shaft is provided at the base end of the handrail arranged on the loading surface of the platform, and a connecting rod is inserted between the output shaft of a linkage switching mechanism arranged under the plate surface of the loading surface and the base end connecting shaft of the handrail, and the input shaft arranged in the linkage switching mechanism is connected to the elevation difference operating shaft of the left support link via a transmission linkage mechanism.

[0015] The linkage switch detent mechanism may comprise a base shaft whose rear end and front end are supported by the rear end bearing wall portion and front end bearing wall portion of the frame portion, and a rear end crank plate portion and an intermediate crank plate portion are respectively provided on the left rear end side of the base shaft with a first collar sandwiched therebetween, the base shaft having base end bearing holes formed in their base ends and fitted and fixed thereto, and an input shaft arc-shaped bearing hole having the same front-to-rear rotation width and centered at the intersection of a vertical reference line passing through the base shaft and a first arc line of a required major radius starting from the base shaft at the top of the rear end crank plate portion and the upper part of the intermediate crank plate portion, and into which the input shaft is fitted and connected.

[0016] The linkage switch detent mechanism may be configured so that a front crank plate is disposed at a distance forward from the intermediate crank plate with a second collar sandwiched therebetween, a base end bearing hole is formed at the base end of the front crank plate coaxially with the base end bearing hole of the rear crank plate and the base end bearing hole of the intermediate crank plate, a base shaft is inserted and fixed into the base end bearing hole at the base end of the front crank plate, and output bearing holes for bearing an output shaft are opened at corresponding intervals in the front and rear at the intersection of an inclined line passing through the base shaft at a required angle clockwise from a vertical reference line at the intermediate crank plate and the front crank plate relative to the base shaft, and a second arc line having a radius longer than the radius of the first arc line.

[0017] The linkage switching detent mechanism may be configured such that a downward extension portion equipped with a lower receiver for a traction coil spring is provided at the intersection of a vertical section line passing from the base end of the front-end crank plate portion through the base axle and a third arc line having a radius longer than the radius of the first arc line of the input shaft arc-shaped bearing hole of the rear-end crank plate portion and the intermediate crank plate portion, and an upper receiver corresponding to this lower receiver is provided on a vertical reference line of the front-end support wall portion of the frame portion, and the rear-end crank plate portion, intermediate crank plate portion and front-end crank plate portion, together with a first collar and a second collar, are supported on the base axle as an integrated switching turning body.

[0018] The input connecting rod may be provided in the front and rear portions and may be configured so that the spacing between the power bearing hole and the input bearing hole can be freely adjusted by means of a screw shaft and a screw hole equipped with a tightening nut. [Effects of the Invention]

[0019] In the handrail raising and lowering operating device 1 on the platform of the automobile lift of the present invention, the raising and lowering difference operating shaft 41 of the left support link 21a and the base end connecting shaft 36 of the handrail 33 are connected via a connection switching moderation mechanism 37, so even if the base end connecting front surface of the platform 6 tilts and a gap occurs between it and the back support surface of the support link, the traction force is not transmitted to the base end connecting shaft 36 of the handrail 33, so even if there is a difference in angle between the road surface on the vehicle side and the platform road surface, the handrail 33 can be raised normally without tilting.

[0020] In the platform handrail raising and lowering operating device 1 of the present invention, the output shaft 38 of the switching rotating body 37a of the connecting switching moderation mechanism 37 is positioned on a radial line larger than the radial line centered on the base axis 49 on which the input shaft 40 is located, so that the rotational stroke of the input shaft 40 of the input connecting rod 47 is enlarged and transmitted to the output shaft 38, and can be appropriately transmitted to the connecting rod 39, allowing the handrail 33 to be raised and lowered smoothly.

[0021] In addition, the input shaft arc-shaped bearing holes 53a and 53b of the switching turning body 37a of the linkage switching detent mechanism 37 are formed as arc-shaped elongated holes with a radius of a circle centered on the base axis relative to the input shaft 40, and when the raising and lowering operation of the platform 6 is used as the power source for the handrail 33, the platform 6 rotates horizontally from the upright state when stored, and even though the input shaft 40 moves in the upright direction, it does not reach one of the horizontal collision surfaces of the arc-shaped elongated hole, so the upright rotation force is not transmitted to the switching turning body 37a, but the input shaft 40 collides with one of the horizontal collision surfaces of the arc-shaped elongated hole, and the upright rotation force is transmitted to the handrail 33, and then the switching turning body 37a rotates in the operating direction, and the force is transmitted from the output shaft 38 through the connecting rod 39 to the base end linkage shaft 36, allowing the handrail 33 to be tilted down around the front support shaft 34a and rear support shaft 34b. Therefore, the handrail 33 does not immediately rise from the platform 6 in the stored state when the train is started, and the risk of workers being struck by the handrail 33 can be eliminated if there are workers inside the train.

[0022] Conversely, even when the platform 6 rotates in the upright direction from a horizontal state and the input shaft 40 moves in the stowing direction, the upright rotation force is not transmitted to the switching turning body 37a because one of the arc-shaped elongated holes has not reached the upright collision surface, and the platform 6 is rotated in the upright direction by the required angle with the handrail 33 in the upright state, and the input shaft 40 collides with one of the arc-shaped elongated holes against the downward collision surface, transmitting the downward rotation force to the handrail 33. Therefore, the platform 6 is raised to the required upright storage angle on the loading surface 15 of the platform 6 outside the car compartment 4 while the handrail 33 is in the upright state, and then the handrail 33 is rotated downward, so that no danger is posed to the surroundings during the initial stage of the platform 6 upright storage.

[0023] When the upper half of the switching body 37a of the linkage switching moderation mechanism 37 is rotated to the right and locked, the upper side of the switching body 37a is supported by collision support against the inner surface of the right wall surface portion 48d of the frame portion 48, and even if a tipping force is applied to the handrail 33, the switching body 37a is stopped and cannot rotate in the direction of the force, so the handrail 33 can be maintained in an upright position.

[0024] The input connecting rod 47 is provided with a front half 47a and a rear half 47b, and both are provided in a connecting structure in which a screw shaft and a screw hole are threadedly engaged, and the distance between the power bearing hole 47a1 and the input bearing hole 47b1 can be adjusted by loosening a nut 56 threaded onto the screw shaft and rotating the front half 47a in the extension direction relative to the rear half 47b to extend it, or rotating it in the opposite direction to contract it. The adjusted length can be locked by tightening the nut 56 onto the front half 47a or rear half 47b of the screw hole.

[0025] Because the linkage switching detent mechanism 37 is installed as described above, when the platform 6 is upright and stored in the car compartment 4, the switching turning body 37a operates with its upper portion tilted to the left of the platform 6 with respect to the perpendicular line M1-M2 passing through the base axis 49. Since the lower receiver 55b of the downward extension portion 51d of the front end crank plate portion 51c is located to the right of the upper receiver 55a with respect to the base axis 49, a rotational force acts counterclockwise around the base axis 49 on the entire switching turning body 37a, causing the handrail 33 to lie down onto the platform 6 via the connecting rod 39 and maintaining the state in which this rotational force is in effect. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a schematic right side view of a vehicle equipped with a handrail raising and lowering actuator for a platform of a car lift according to the present invention; FIG. [Figure 2] FIG. 1 is a left side view showing the state in which the handrail, which rises and falls in conjunction with the unfolding operation of the platform in the car lift of the present invention, rises and falls, and the platform rises and falls. [Figure 3] This is a cutaway left side view of the platform in the car lift of the present invention, showing the operating rod that connects the platform to a link supported by the upper arm and lower arm so that the platform is in a horizontal position when lifting and lowering cargo and in a vertical position when stored, and the operating status of the handrail. [Figure 4] FIG. 1 is a right side view showing the lifting cylinder and the linkage structure that lifts and lowers the platform of the automobile lift of the present invention to a horizontal state for lifting and lowering cargo and a vertical state for storage. [Figure 5]1 is a cutaway partial front view showing the internal structure of the main part of the handrail raising and lowering operating device on the platform of the automobile lift of the present invention, when the platform is in a vertically upright stored state. FIG. [Figure 6] FIG. 6 is an enlarged partial cross-sectional view taken along line AA in FIG. 5. [Figure 7] FIG. 6 is an enlarged partial cross-sectional view taken along line BB in FIG. 5. [Figure 8] FIG. 8 is a partial front view taken along line CC in FIG. 7. [Figure 9] FIG. 4 is a side view showing a switching and turning main body of the linkage switching detent mechanism. [Figure 10] FIG. 2 is an exploded view showing the components constituting the main switching and turning device. [Figure 11] FIG. 10 is an inner view of the front end bearing wall of the frame, showing the location of an upper support for mounting the upper end of the traction coil spring. [Figure 12] 1 is a cutaway partial plan view showing the internal structure of the main parts of the handrail raising and lowering operating device on the platform of the automobile lift of the present invention, when the platform is deployed horizontally. [Figure 13] FIG. 13 is an enlarged partial cross-sectional view taken along line DD in FIG. [Figure 14] FIG. 13 is an enlarged partial cross-sectional view taken along line EE in FIG. [Figure 15] FIG. 13 is an enlarged partial cross-sectional view taken along line FF in FIG. 12. [Figure 16] This is the first explanatory side view illustrating an example of abnormal operation of the handrail in a conventional example when the vehicle is positioned on an inclined road surface and the platform is used in a state where it is approaching or separating from the horizontal road surface, (a) is a schematic explanatory diagram of the operation from the left side, and (b) is an explanatory diagram of the tilting state of the handrail in the direction of line JJ in (a). [Figure 17] This is a second explanatory side view illustrating an example of abnormal operation of the handrail when used in a conventional example in a state where the platform approaches and moves away from a sidewalk that is uneven in level with the roadway, (a) is a schematic explanatory diagram of operation from the left side, and (b) is an explanatory diagram of the tilting state of the handrail in the direction of line KK in (a). DETAILED DESCRIPTION OF THE INVENTION

[0027] In the car lift 2, the vehicle 3 side and the platform 6 side are connected by a parallel link using a left upper arm 17a and a right upper arm 17b and a left lower arm 18a and a right lower arm 18b, which are arranged on the left and right sides, and the platform 6 is provided with a left pivot shaft 19a and a right pivot shaft, which serve as the axis of elevation of the platform 6, on the upper left and right ends of the front of the base end in a horizontal state, respectively, and the left pivot shaft 19a is fitted into a left tip end bearing hole of the left upper arm 17a or a left pivot bearing of the left tilt link 22a connected thereto. The right pivot shaft 19b is fitted into and supported by a hole 23a on the left upper arm 17a, and the right pivot shaft 19b is fitted into and supported by a bearing hole at the tip of the right upper arm 17b or a right tilt link 22 connected thereto, and is supported by the right upper arm 17b by being fitted into this right pivot bearing hole. A left support link 21a is supported on the left pivot shaft 19a by the left pivot shaft 19a being fitted into an upper left pivot bearing hole 21a1 provided at the top of the left support link 21a, and the left tip support shaft 20a is fitted into and supported by a lower left tip support bearing hole 21a2 provided at the bottom of the left support link 21a.The platform 6 is provided with a left pivot shaft 19a fitted and supported in the left pivot bearing hole 23a of the tip shaft of the left upper arm 17a or the right upper arm 17b or the left tilt link 22a connected thereto, and a right pivot shaft fitted and supported in the right pivot bearing hole of the right tilt link 22b, respectively. The upper part of the platform 6 is journaled on the right pivot shaft 19b, and the left tip support shaft 20a of the left lower arm 18a is fitted and supported in the lower part. The left support link 21a has a left lower tip support bearing hole 21a2 for supporting the tip shaft of the right lower arm 18b, and the right support link 21b has a right lower tip support bearing hole for fitting and supporting the tip shaft of the right lower arm 18b. The left support link 21a or the right support link 21b of the platform 6 is provided with a pivot bearing hole 21a1 or a pivot bearing hole 21a2 on the upper side and a pivot bearing hole 21a2 on the lower side. a handrail raising and lowering operating shaft (41) extending across the platform (6) from the left upper pivot bearing hole (21a1) or the right upper pivot bearing hole (21a2) to the left lower tip support bearing hole (21a2) or the right lower tip support bearing hole (21a3); one end of a transmission linkage mechanism (42) that raises and lowers the handrail (33) is connected to the tension differential operating shaft (41); when the platform (6) rotates about the left pivot shaft (19a) or the right pivot shaft from a horizontal position laid sideways on the loading platform surface (15) to a vertically stored and raised position, or conversely, from a stored and raised position to a horizontal position, the difference in movement of the base end (6a) of the platform (6) relative to the left support link (21a) or the right support link activates the transmission linkage mechanism (42) that is connected to the tension differential operating shaft (40), thereby raising or lowering the handrail (33) arranged on the loading platform surface (15) of the platform (6).

[0028] A base end connecting shaft 36 is provided at the base end of the handrail 33 arranged on the loading surface 15 of the platform 6, and a connecting rod 39 is inserted between the output shaft 38 of a linkage switching detent mechanism 37 arranged under the plate surface of the loading surface 15 and the base end connecting shaft 36 of the handrail 33, and an input shaft 40 arranged in the linkage switching detent mechanism 37 is connected to the elevation difference operating shaft 41 of the left support link 21a via a transmission linkage mechanism 42.

[0029] The linkage switching detent mechanism 37 includes a base shaft 49 whose front and rear ends are supported by a front end bearing wall portion 48a and a rear end bearing wall portion 48b of a frame portion 48, and a first collar 50a is inserted and fixed to the base shaft 49 from the rear end side into a base end bearing hole 52a of a base end portion 51a1 of a rear end crank plate portion 51a and a base end bearing hole 52b of a base end portion 51b1 of an intermediate crank plate portion 51b, and a first reference line G1-G2 passing through the base shaft 49 and a first arc line R1 of a required radius originating from the base shaft 49 at an upper portion 51a2 of the rear end crank plate portion 51a and an upper portion 51b2 of the intermediate crank plate portion 51b. The input shaft 40 is fitted and connected to the input shaft arc-shaped bearing hole 53a and the input shaft arc-shaped bearing hole 53b, which have the same front-to-rear rotation width, about the first intersection X1. The front-end crank plate portion 51c is spaced forward from the intermediate crank plate portion 51b and sandwiches the second collar 50b. The base-end bearing hole 52a in the base end portion 51c1 of the front-end crank plate portion 51c is opened coaxially with the base-end bearing hole 52a in the rear-end crank plate portion 51a and the base-end bearing hole 52b in the intermediate crank plate portion 51b. The base shaft 49 is fitted into the base-end bearing hole 52a in the base end portion 51c1 of the front-end crank plate portion 51c. and an output bearing hole 54a and an output bearing hole 54b for bearing the output shaft 38 are opened in a corresponding manner in the front and rear at second intersection points X2, which are the intersection points of an inclined line H1-H2 passing through the base axis 49 at a required angle S° clockwise from a vertical reference line G1-G2 in the intermediate crank plate portion 51b and the front-end crank plate portion 51c relative to the base axis 49 and a second arc line R2 having a radius longer than the radius of the first arc line R1. A lower extension portion 51d having a lower support 55b of the traction coil spring 55 is provided at a third intersection X3, which is the intersection point of the plate portion 51b with a third arc line R3 having a radius longer than the radius of the first arc line R1 of the input shaft arc-shaped bearing hole 53b, and an upper support 55a corresponding to this lower support 55b is provided at a fourth intersection X4, which is the intersection point of a vertical reference line M1-M2 passing through the base axis 49 and a fourth arc line R4 having a required radius above the base axis 49, in the front end support wall portion 48a of the frame portion 48. The rear end side crank plate portion 51a, the intermediate crank plate portion 51b, and the front end side crank plate portion 51c are connected to the first collar 50a,The second collar 50b is incorporated into the switching body 37a, which is supported on the base shaft 49 as an integrated switching body 37a.

[0030] The input connecting rod 47 is provided with a front half 47a and a rear half 47b, and is configured so that the spacing between the power bearing hole 47a and the input bearing hole 47b can be freely adjusted by threadedly tightening and connecting the screw shaft equipped with a tightening nut 56 and the screw hole. [Example]

[0031] Hereinafter, a handrail raising and lowering actuator device for a platform of an automobile lift according to the present invention will be described with reference to a handrail raising and lowering actuator device 1 for a platform of an automobile lift according to an embodiment shown in FIGS.

[0032] The automobile lift 2 according to the present invention comprises a platform 6 arranged corresponding to an entrance / exit 5 of a compartment 4 of a vehicle 3, and a lifting mechanism 7 for raising and lowering the platform 6.

[0033] In this specification, the left side of the platform 6 refers to the side surface on the left side from the base end 6a of the platform 6 toward its tip end 6b, and the opposite right side of the platform 6 refers to the side surface on the right side when looking in the direction of the base end 6a and tip end 6b of the platform 6. Furthermore, the opposite side when looking from the base end 6a of the platform 6 toward the tip end 6b is referred to as the front, and conversely, the opposite side when looking from the tip end 6b toward the base end 6a is referred to as the back. Furthermore, the same applies to the stopper plate 9 and other members provided on the stopper portion 8 of the platform 6.

[0034] Furthermore, with respect to the front 3a and rear 3b of the vehicle 3, the left side when looking from the front 3a to the rear 3b is referred to as the left side, and similarly, the right side when looking from the front 3a to the rear 3b is referred to as the right side. Furthermore, the opposite side when looking from the front 3a of the vehicle 3 toward the rear 3b is referred to as the front, and conversely, the opposite side when looking from the rear 3b toward the front 3a is referred to as the back.

[0035] The lifting mechanism 7 has a mounting frame 11 arranged on the underside of a body frame 10 at the rear 3b of the vehicle 3, with a left bearing portion 12a provided on the left side surface 11a of the mounting frame 11 and a right bearing portion 12b provided on the opposite right side surface 11b.

[0036] The platform 6 is supported in a horizontal position and moves between the road surface 13 and the floor surface 14 of the vehicle compartment 4, raising and lowering the loading surface 15 of the platform 6. When it descends to the road surface 13, cargo is loaded onto a cart or the like and transferred from the road surface 13 to the loading surface 15 of the platform 6, or from the loading surface 15 of the platform 6 to the road surface 13.

[0037] In addition, when the base end 6a of the platform 6 is connected to the floor surface 14 of the vehicle compartment 4, the cargo is transferred from the loading surface 15 of the platform 6 to the floor surface 14 of the vehicle 3 or from the floor surface 14 of the vehicle 3 to the loading surface 15 of the platform 6.

[0038] The platform 6 is arranged so as to be able to rise and fall, and when raised, closes the entrance / exit 5 of the vehicle compartment 4, and when laid down, is in a horizontal state to form a loading platform surface 15.

[0039] The platform 6 has a left first bracket 16a1, a left second bracket 16a2 and a left third bracket 16a3 arranged at required intervals from the outside to the inside on the left end 6a1 of the base end 6a.

[0040] Similarly, a right first bracket, a right second bracket, and a right third bracket are provided on the right end 6a2 of the base end 6a of the platform 6.

[0041] A left connecting shaft 24a1 is inserted into a bearing hole (not shown) of the left tip end 17a1 of the left upper arm 17a arranged on the left side of the lifting mechanism 7 and the left connecting bearing hole 24a of the left tilt link 22a to connect them, and a left pivot shaft 19a journaled on the left second bracket 16a2 and the left third bracket 16a3 is inserted into the left pivot bearing hole 23a of the left tilt link 22a to pivotally support the left end 6a1 of the base end 6a of the platform 6.

[0042] A left extension 19a1 of the left pivot shaft 19a is inserted between the first left bracket 16a1 and the second left bracket 16a2 at the left end 6a1 of the base end 6a of the platform 6, and is pivotally supported by being inserted into an upper left pivot bearing hole 21a1 at the top of the left support link 21a that is parallel to the left extension 19a1, and is journalled to the left tip 18a1 of the left lower arm 18a that is arranged on the left side of the lifting mechanism 7 by a left tip support shaft 20a that is journalled in a lower left tip support bearing hole 21a2 of the parallel left support link 21a.

[0043] A left lower front support plate 16c is provided between the left first bracket 16a1 and the left second bracket 16a2 at the left end 6a1 of the base end 6a of the platform 6.

[0044] A left lower rear support plate 21a3 is provided on the lower rear surface of the left support link 21a. When the platform 6 is supported horizontally, the left lower front support plate 16c is connected to and supported by the left lower rear support plate 21a3.

[0045] Similarly, although not shown in detail, a right first bracket, a right second bracket and a right third bracket are provided on the right end 6a2 of the base end 6a of the platform 6.

[0046] Although not shown in detail, a right connecting shaft is inserted into the bearing hole at the tip of the right upper arm 17b arranged on the right side of the lifting mechanism 7 and the right connecting bearing hole of the right tilt link 22b to connect them, and a right pivot shaft supported by the right second bracket and the right third bracket is inserted into the right pivot bearing hole of the right tilt link 22b to pivotally support the right end of the base end 6a of the platform 6.

[0047] Similarly, although not shown in detail, the right extension of the right pivot shaft is inserted between the first right bracket and the second right bracket at the right end of the base end 6a of the platform 6, and is pivotally supported by being inserted into the right pivot bearing hole at the top of the right support link that is parallel to the right extension, and the tip of the right lower arm 18b arranged on the right side of the lifting mechanism 7 is pivotally supported by the right tip support shaft that is borne in the right lower tip support bearing hole of the parallel right support link.

[0048] Similarly, although not shown in detail, a right lower front support plate is provided between the right first bracket and the right second bracket at the right end 6b1 of the base end 6a of the platform 6.

[0049] Similarly, although not shown in detail, a left lower rear support plate is provided below the rear surface of the right support link. When the platform 6 is supported horizontally, the right lower front support plate is connected to and supported by the right lower rear support plate.

[0050] From the above-mentioned configuration, the platform 6 of the lifting mechanism 7 is supported by left and right quadrilateral links respectively connected by the left upper arm 17a and left lower arm 18a via the left tilt link 22a, and the right upper arm 17b and right lower arm 18b via the right tilt link 22b.

[0051] The left tilt link 22a has a left engagement groove 25a recessed in the left base end edge 22a1, and a left tilt lock 26a having a tip end 26a1 facing the left engagement groove 25a is rotatably supported on a support shaft 26a2 protruding from one side surface of the left upper arm 17a and is arranged to be freely lockable.

[0052] A left biasing spring 27a is disposed between the left tilt link 22a and the left tilt lock 26a, and biases the tip end 26a1 of the left tilt lock 26a so as to engage with the engagement groove 25a.

[0053] A left release roller 28a is mounted on the left tip 18a1 of the left lower arm 18a on a side surface corresponding to the left tilt lock 26a.

[0054] The left tilt link 22a is provided with a left rod tip bearing hole 29a, into which a left tip shaft 31a of a left rod portion 30a1 of a left lifting hydraulic cylinder 30a is fitted and connected, thereby connecting the left tilt link 22a and the left lifting hydraulic cylinder 30a.

[0055] The right tilt link 22b has a configuration similar to that of the left tilt link 22a and is connected to and supported by the right support link 21b.

[0056] The lifting mechanism 7 may not be provided with the left tilt link 22a and the right tilt link 22b. In that case, the platform 6 will of course not be able to tilt, but the left tip of the left upper arm 17a may be pivotally supported on the left pivot shaft 19a inserted into the upper left pivot bearing hole 21a1 of the left support link 21a, and the right tip of the right upper arm 17b may be pivotally supported on the right pivot shaft 19b inserted into the upper right pivot bearing hole of the right support link 21b.

[0057] When the platform 6 descends to the road surface 13, the left upper arm 17a and the left lower arm 18a move relative to each other, causing the left release roller 28a to move, which pulls the left biasing spring 27a around the support shaft 26a2 in the direction opposite to the biasing direction, rotating the left tilt lock 26a and disengaging the tip end 26a1 of the left tilt lock 26a from the left engagement groove 25a, thereby automatically releasing the lock between the left upper arm 17a and the left tilt link 22a.

[0058] When the platform 6 descends to the road surface 13, the right upper arm 17b and the right lower arm 18b are configured to move relative to each other in the same manner as the left upper arm 17a and the left lower arm 18a, thereby disengaging the right tip of the right tilt lock from the right engagement groove and automatically releasing the lock between the right upper arm 17b and the right tilt link 22b.

[0059] In this embodiment, as shown in FIG. 4, a raising and lowering cylinder 32 is installed between the right support link 21b and the platform 6, and the platform 6 can be raised and lowered around the left pivot shaft 19a and the right pivot shaft 19b when the platform 6 is raised and lowered in a horizontal state to connect to the floor 14 of the vehicle 3, and when the platform 6 is rotated from that state to a vertical state for storage.

[0060] The loading surface 15 of the platform 6 is provided at the front and rear of one side edge with a front end support base 35a that supports the base end of the front end support portion 33a of the handrail 33 by a front support shaft 34a, and a rear end support base 35b that supports the base end of the rear end support portion 33b by a rear support shaft 34b.

[0061] At the base end of the front end support portion 33a near the base end 6a of the platform 6, the front support shaft 34a is spaced from the lying side of the handrail 33, and a base end connecting shaft 36 is provided above the front support shaft 34a.

[0062] A linkage switching detent mechanism 37 is provided under the surface of the front end support pillar base 35a near the base end 6a of the platform 6 and the nearby loading platform surface 15, and a linkage rod 39 is inserted between the output shaft 38 provided on the linkage switching detent mechanism 37 and the base end linkage shaft 36 of the handrail 33 to connect them.

[0063] The linkage switching detent mechanism 37 is provided with an input shaft 40. The input shaft 40 is linked to an elevation difference operating shaft 41 of the left support link 21a via a transmission linkage mechanism 42.

[0064] The transmission linkage mechanism 42 is provided by a first transmission rod 43, a first link 44, a second transmission rod 45 and a second link 46, and is disposed under the plate surface near the left side of the platform 6.

[0065] The first transmission rod 43 has its front end connected to the elevation difference operating shaft 41 so as to be freely reciprocable, and its rear end connected to the first link 44 by a support shaft 44b so as to be freely rotatable.

[0066] The first link 44 has its V-shaped base rotatably supported by a central support shaft 44a, and the rear end of the first transmission rod 43 is rotatably connected to the outer diameter side of one end of the first link 44 by a support shaft 44b, and the rear end of the second transmission rod 45 is rotatably connected to the inner side of the outer diameter side support shaft 44b by a support shaft 44c.

[0067] The front end of the second transmission rod 45 is rotatably connected to one end of the second link 46 by a support shaft 46b.

[0068] The second link 46 has its approximately V-shaped base rotatably supported by a central support shaft 46a, and its other end is rotatably connected to the power bearing hole 47a1 of the input connecting rod 47 of the connecting switch moderation mechanism 37 by a support shaft 46c.

[0069] The linkage switching detent mechanism 37 includes a base shaft 49 whose rear and front ends are supported by the rear end bearing wall portion 48b and front end bearing wall portion 48a of the frame portion 48, and a rear end crank plate portion 51a and an intermediate crank plate portion 51b, which are disposed on the left rear end side of the base shaft 49 with a first collar 50a in between, with base end bearing holes 52a and 52b in the base end portions 51a1 and 51b1, respectively, and the base shaft 49 is inserted and fixed to support the base shaft 49.

[0070] As shown in FIG. 10(a), an upper portion 51a2 of the rear-end crank plate portion 51a and an upper portion 51b2 of the intermediate crank plate portion 51b are provided with input shaft arc-shaped bearing holes 53a and 53b having the same longitudinal rotation width, for fitting and connecting the input shaft 40 therethrough, with the first arc-shaped bearing holes 53a and 53b being bored at a first intersection X1, which is the intersection of a vertical reference line G1-G2 passing through the base shaft 49 and a first arc-shaped line R1 having a required radius from the center of the base shaft 49.

[0071] The front end crank plate portion 51c is spaced forward from the intermediate crank plate portion 51b and has a base shaft 49 inserted and fixed in a base end bearing hole 52c of a base end portion 51c1 across the second collar 50b.

[0072] As shown in Figures 10(b) and 10(c), output bearing holes 54a and 54b for bearing the output shaft 38 are opened in a spaced-apart relationship in the front and rear directions at second intersection points X2, which are the intersection points of an inclined line H1-H2 that passes through the base axis 49 at a required angle S° clockwise from a vertical reference line G1-G2 at the intermediate crank plate portion 51b and the front-end crank plate portion 51c with respect to the base axis 49, and a second arc line R2 of a required radius.

[0073] A downward extension portion 51d equipped with a lower support 55b for a traction coil spring 56 is provided at a third point X3, which is the intersection of a vertical reference line G1-G2 passing through the base end portion 51c1 of the front end crank plate portion 51c and the base axis 49 and a third arc line R3 of a required radius.

[0074] As shown in Figure 11, the upper support 55a corresponding to the lower support 55b is provided on the front end support wall portion 48a of the frame portion 48 at a fourth intersection X4, which is the intersection of a vertical reference line G3-G4 corresponding to the vertical reference line G1-G2 and a fourth arc line R4 of a required length upward from the base axis 49 in the opposite direction to the third intersection X3.

[0075] The rear end crank plate portion 51a, the intermediate crank plate portion 51b, and the front end crank plate portion 51c are assembled with the first collar 50a and the second collar 50b to form an integrated switching turning body 37a, which is supported on the base shaft 49.

[0076] In the frame portion 48, a central support shaft 46a for supporting the second link 46 is provided between an upper support plate 48e and a lower support plate 48f that are spaced apart from each other and face each other, and the central support shaft 46a protrudes upward from the upper support plate 48e and is rotatably provided.

[0077] When the platform 6 is operated to raise or lower, it is connected to the elevation difference operating shaft 41 provided on the left support link 21a and the second link 46 of the transmission linkage mechanism 42, and a support shaft 46c provided on the other end of the second link 46 is inserted and connected to a power bearing hole 47a1 at one end of the input connecting rod 47, and the input shaft 40 is inserted into an input bearing hole 47b1 provided at the other end of the input connecting rod 47 and is inserted and connected to an input shaft arc-shaped bearing hole 53a in the rear end crank plate portion 51a and an input shaft arc-shaped bearing hole 53b in the intermediate crank plate portion 51b.

[0078] The input connecting rod 47 has a front half 47a and a rear half 47b, and these are provided in a connecting structure in which a screw shaft and a screw hole are threadedly engaged. The distance between the power bearing hole 47a1 and the input bearing hole 47b1 can be adjusted by loosening a nut 56 threaded onto the screw shaft and rotating the front half 47a in the extension direction relative to the rear half 47b to extend it, or rotating it in the opposite direction to contract it. The adjusted length can be locked by tightening the nut 56 onto the front half 47a or rear half 47b of the screw hole.

[0079] Because the linkage switching detent mechanism 37 is installed as described above, when the platform 6 is upright and stored in the vehicle compartment 4, as shown in Fig. 7, the switching roll body 37a operates with its upper portion tilted toward the left wall surface 48c of the frame portion 48 with respect to the perpendicular line M1-M2 passing through the base axis 49. When the platform 6 is rotated horizontally with the handrail 33 upright with respect to this base axis 49, the lower support 55b of the downward extension portion 51d of the front-end crank plate portion 51c rotates the upper half of the switching roll body 37a of the linkage switching detent mechanism 37 to the right with respect to the perpendicular line M1-M2 around the base axis 49, as shown in Fig. 14, and the upper side surface of the switching roll body 37a is collision-supported against the inner surface of the right wall surface 48d of the frame portion 48. During this collision rotation, the output shaft 38, which is inserted into the output bearing hole 38a of the connecting rod 39 and the output shaft bearing holes 54a, 54b of the switching turning body 37a, is located close to the perpendicular line M1-M2, so even if a tipping force is applied to the handrail 33, the switching turning body 37a is stopped and cannot rotate in the direction of the force, so the handrail 33 can be maintained in an upright position.

[0080] In addition, the output shaft 38 of the switching rotating body 37a of the link switching moderation mechanism 37 is located on a radial line larger than the radial line centered on the base axis 49 on which the input shaft 40 is located, so in the embodiment, the operation of the second link 46 is transmitted to the input shaft 40 through the input link rod 47, and the rotational stroke by the input shaft 40 is expanded and transmitted to the output shaft 38, and can be appropriately transmitted to the link rod 39, allowing the handrail 33 to be raised and lowered smoothly.

[0081] Furthermore, the input shaft arc-shaped bearing hole 53a and the input shaft arc-shaped bearing hole 53b of the switching turning body 37a of the linkage switching detent mechanism 37 are formed as arc-shaped long holes on a radial line centered on the base axis relative to the input shaft 40, and when the raising and lowering operation of the platform 6 is used as the power source for the handrail 33, for example, even if the platform 6 rotates horizontally from the upright state when stored and the input shaft 40 moves in the upright direction, the raising rotation force is not transmitted to the switching turning body 37a because it does not reach one of the horizontal collision surfaces of the arc-shaped long holes, and the platform 6 rotates in the upright direction with the handrail 33 in the upright state. When the input shaft 40 collides with one of the collapse collision surfaces of the arc-shaped elongated hole, an erection rotation force is transmitted to the handrail 33, and then the switching turning body 37a rotates in the operating direction, transmitting the force from the output shaft 38 to the base end connecting shaft 36 via the connecting rod 39, causing the handrail 33 to collapse around the front support shaft 34a and rear support shaft 34b. As a result, the handrail 33 does not rise up from the platform 6 that is upright in the stowed state, eliminating the risk of workers being struck by it if they are inside the vehicle.

[0082] Conversely, even if the platform 6 rotates in the upright direction from the horizontal state and the input shaft 40 moves in the retracted direction, the upright rotation force is not transmitted to the switching turning body 37a because it has not reached one of the upright collision surfaces of the arc-shaped elongated hole, and the platform 6 rotates in the upright direction with the handrail 33 in an upright state. Then, the input shaft 40 collides with one of the collapse collision surfaces of the arc-shaped elongated hole, transmitting the collapse rotation force to the handrail 33, and then the switching turning body 37a rotates in the operating direction, transmitting the force from the output shaft 38 through the connecting rod 39 to the base end connecting shaft 36, causing the handrail 33 to collapse about the support shafts 34a and 34b. Therefore, the platform 6 is raised to the required storage and erection angle while the handrail 33 is left in an upright position on the loading surface 15 of the platform 6 outside the vehicle compartment 4, and then the handrail 33 is rotated downward to prevent any danger to the surrounding area when the platform 6 is initially being stored and erected.

[0083] A support shaft 57 may be provided on the first link 44 of the transmission linkage mechanism 42, and a stopper plate raising and lowering mechanism 58 that raises and lowers the stopper plate 9 of the stopper portion 8 may be connected to this support shaft 57, so that the handrail 33 and the stopper plate 9 can be connected and operated. [Industrial Applicability]

[0084] Since the platform 6 is provided with handrails 33, the platform 6 can be used to safely load and unload goods onto and from vehicles.

[0085] The handrail 33 automatically rises and falls in conjunction with the deployment and storage operations of the platform 6, and when the platform 6 is stored, it is stored in the vehicle compartment after being lowered, and when it is deployed, it moves outside the vehicle compartment while remaining lowered, ensuring the safety of workers in the vehicle compartment.

[0086] The handrail 33 erected on the platform 6 is locked in the erected state and is equipped with an absorption section to absorb the moving force caused by the difference in the contact surfaces of the platform 6 and the vehicle supporting the lifting mechanism, so the handrail 33 is not subjected to traction force and remains upright, contributing to ensuring reliability. [Explanation of symbols]

[0087] 1. Handrail raising and lowering actuator for car lift platform 2. Car lifts 3 vehicles 3a front 3b rear 4 Cabin 5 Entrance / exit 6 Platform 6a Proximal end 6a1 Left end 6a2 Right side end 6b Tip 7 Lifting mechanism 8 Stopper 9 Stopper plate 10 Body frame 11 Mounting frame 11a Left side 11b Right side 12a Left bearing part 12b Right bearing part 13 Road surface 14 Floor 15 Cargo surface 16a1 Left 1st bracket 16a2 Left 2nd bracket 16a3 Left third bracket 16b Intermediate bracket 16c Lower left front support plate 17a Left upper arm 17a1 Left tip 17a2 Bearing hole 17b Right upper arm 18a Left lower arm 18a1 Left tip 18b Right lower arm 18b1 Right tip 19a Left pivot shaft 19a1 Left side extension 19b Right pivot shaft 20a Left end support shaft 21a Left bearing link 21a1 Upper left pivot bearing hole 21a2 Lower left end support bearing hole 21a3 Lower left rear support plate 21b Right bearing link 22a Left tilt link 22a1 Left proximal edge 22b Right tilt link 23a Left pivot bearing hole 24a Left connecting bearing hole 24a1 Left connecting axis 25a Left engagement groove 26a Left tilt lock 26a1 Left tip 26a2 spindle 27a Left bias spring 28a Left release roller 29a Left rod end bearing hole 30a Left lift hydraulic cylinder 30a1 Left rod part 31a Left tip shaft 32 Elevating cylinder 33 Handrail 33a Front end support section 33b Rear end support section 34a Front support shaft 34b Rear support shaft 35a Front end support base 35b Rear support base 36 Base end connecting shaft 37 Linked switching moderation mechanism 37a Switching body 38 Output shaft 39 continuation 40 Input shaft 41 Elevation difference operating axis 42 Transmission linkage mechanism 43 First transmission rod 44 First Link 44a Center support shaft 44b Support shaft 44c spindle 45 Second transmission rod 46 Second Link 46a Center support shaft 46b Support shaft 46c spindle 47 Input connection rod 47a first half 47a1 Power bearing hole 47b second half 47b1 Input bearing hole 48 Frame section 48a Front end bearing wall 48b Rear end bearing wall 48c Left side wall section 48d Right side wall section 48e Upper support plate 48f Lower support plate part 49 Principles 50a 1st color 50b 2nd color 51a Rear end crank plate 51a1 Proximal end 51a2 upper part 51b Intermediate crank plate section 51b1 Proximal end 51b2 Upper part 51c Front crank plate 51c1 Proximal end 51d Lower extension 52a Proximal bearing hole 52b Proximal bearing hole 52c Proximal bearing hole 53a Input shaft arc-shaped bearing hole 53b Input shaft arc-shaped bearing hole 54a Output shaft bearing hole 54b Output shaft bearing hole 55 Traction coil spring 55a Upper catch 55b Lower support 56 Nut 57 Spindle 58 Stopper plate lifting mechanism G1-G2 Vertical reference line H1-H2 slope line M1-M2 Vertical reference line R1 First arc line R2 Second arc line R3 Third arc line R4 4th circular arc X1 1st intersection X2 2nd intersection X3 3rd intersection X4, 4th intersection point

Claims

1. In an automobile lift, the vehicle side and the platform side are connected by parallel links of left and right upper arms and left and right lower arms, and the platform is provided with a left pivot shaft and a right pivot shaft, which serve as the platform's up and down shaft, respectively, on the upper left and right ends of the front of the base end in a horizontal position. The left pivot shaft is inserted into the left tip bearing hole of the left upper arm or the left pivot bearing hole of the left tilt link connected thereto and is supported by the left upper arm, and the right pivot shaft is The left pivot shaft has a left support link fitted into a left upper pivot bearing hole provided at the top thereof and supported thereon, and a left tip support shaft provided at a left lower end support hole provided at the bottom thereof, the left support link being fitted into a left upper pivot bearing hole provided at the top thereof and supported thereon, and the tip of the left lower arm is supported by the left tip support shaft provided at a left lower end support hole provided at the bottom thereof, and the right pivot shaft has a right support link fitted into a right upper pivot bearing hole provided at the top thereof and supported thereon, and the right tip support shaft has a right support link fitted into a right upper pivot bearing hole provided at the top thereof and supported thereon, and the right tip support shaft is provided at a left lower end support hole provided at the bottom thereof. The tip of the right lower arm is supported on a right tip support shaft that is disposed across a right lower tip support bearing hole provided in the left support link or the right support link, and an elevation difference operating shaft is disposed across one of the left support link or the right support link at a midpoint between the upper left pivot bearing hole or the upper right pivot bearing hole on the upper side thereof and the lower left tip support bearing hole or the lower right support bearing hole on the lower side thereof, and at a position separated toward the tip of the platform from a straight line connecting the upper left pivot bearing hole or the upper right pivot bearing hole and the lower left tip support bearing hole or the lower right tip support bearing hole, A handrail raising and lowering operating device for a platform of a car lift, in which one end of a transmission linkage mechanism that raises and lowers the handrail is connected to the elevation difference operating shaft, and when the platform rotates around the left pivot shaft and the right pivot shaft from a horizontal position laid sideways on the loading platform surface to a vertical stored and erected position, or conversely, rotates from a stored and erected position to a horizontal position, the transmission linkage mechanism connected to the elevation difference operating shaft is activated by the movement difference of the base end of the platform relative to the left support link or the right support link, thereby raising and lowering the handrail arranged on the loading platform surface of the platform.

2. A handrail raising and lowering operating device for a platform of an automobile lift as claimed in claim 1, wherein a base end connecting shaft is provided at the base end of the handrail arranged on the loading surface of the platform, a connecting rod is inserted between the output shaft of a linkage switching detent mechanism arranged under the plate surface of the loading surface and the base end connecting shaft of the handrail, and an input shaft arranged in the linkage switching detent mechanism is connected to the lifting difference operating shaft of the left support link via a transmission linkage mechanism.

3. 3. The handrail raising and lowering operating device for a car lift platform according to claim 1 or 2, wherein the linkage switching detent mechanism comprises a base shaft, the front and rear ends of which are supported on the front and rear bearing wall portions of the frame portion, and which is fitted and fixed from its rear end side into a base end bearing hole at the base end of the rear end crank plate portion and a base end bearing hole at the base end of the intermediate crank plate portion, with a first collar sandwiched between them, and at the top of the rear end crank plate portion and the top of the intermediate crank plate portion, there are respectively opened input shaft arc-shaped bearing holes and input shaft arc-shaped bearing holes having the same front and rear turning widths, into which the input shafts are fitted and connected, with the first intersection being the intersection point between a vertical reference line passing through the base shaft and a first arc line of a required radius starting from the base shaft.

4. 3. The platform handrail raising and lowering operating device for a car lift according to claim 1 or 2, wherein the linkage switching detent mechanism is spaced forward from the intermediate crank plate portion, the front crank plate portion sandwiching the second collar, the base end bearing hole at the base end of the front crank plate portion being opened coaxially with the base end bearing hole of the rear crank plate portion and the base end bearing hole of the intermediate crank plate portion, the base shaft being inserted and fixed into the base end bearing hole at the base end of the front crank plate portion, and output bearing holes for bearing the output shaft are opened correspondingly in the front and rear at respective second intersections which are the intersections of an inclined line passing through the base axis at a required angle S° clockwise from a vertical reference line at the intermediate crank plate portion and the front crank plate portion with respect to the base shaft, and a second arc line having a radius longer than the radius of the first arc line.

5. 3. The handrail raising and lowering operating device for a car lift platform according to claim 1 or 2, wherein the linkage switching detent mechanism has a downward extension portion provided with a lower support for a traction coil spring at a third intersection point where a vertical reference line passing from the base end of the front crank plate portion through the base shaft intersects with a third arc line having a longer radius than the first arc lines of the arc-shaped input shaft bearing hole of the rear crank plate portion and the arc-shaped input shaft bearing hole of the intermediate crank plate portion, and an upper support corresponding to this lower support is provided at a fourth intersection point on the front support wall portion of the frame portion where the vertical reference line passing through the base shaft intersects with a fourth arc line having a required radius above the base shaft, and the rear crank plate portion, intermediate crank plate portion and front crank plate portion, together with a first collar and a second collar, are supported on the base shaft as an integrated switching turning body.

6. A handrail raising and lowering operating device for an automobile lift platform as claimed in claim 1 or claim 2, wherein the input connecting rod is provided in the front and rear portions and is configured so that the spacing between the power bearing hole and the input bearing hole can be freely adjusted by threadedly tightening and connecting it using a screw shaft equipped with a tightening nut and a screw hole.

Images