JPH0653290U - Treads for loading and unloading vehicles from vehicle carriers - Google Patents

Abstract

(57) [Summary] [Purpose] A tread plate for loading and unloading vehicles, which is continuously installed at the rear of the platform,
To improve the operability of switching the posture between the use posture and the posture of switching the posture of the tread in a configuration in which the posture is switched between the folded posture and the posture in which the cargo platform is folded and folded up. [Structure] A first frame 4 is rotatably provided at a rear portion of a luggage carrier 1, a second frame 8 is foldably connected to the first frame 4, and a tread member 10 is provided on each of the frames 4 and 8.
And the first link 11 whose contraction is regulated to a predetermined length is provided in the vicinity of the pivot portion of the first frame 4 and the second frame 8.
And a movable member 15 slidable along a guide rod 14 at the rear of the loading platform and a first frame 4 by a second link 18 so that the first frame 4 rises up. First and second locking means 19 and 20 are provided for fixing the moving member 15 to the bed side and the second frame 8 to the first frame 4 side in the switching state to.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improved technique for a vehicle loading and unloading tread mounted on a rear portion of a loading platform of a vehicle carrier.

[0002]

[Prior art]

 When connecting the loading and unloading treads to the rear part of the loading platform of a vehicle carrier, the minimum ground clearance of the vehicle to be loaded and unloaded on the cargo bed (maximum height from the ground of the lower surface of the chassis between the front and rear tires and other incidental equipment) ) Is targeted at a low vehicle such as a sports car, the shorter the tread is, the larger the angle formed with the bed is.For example, when the front wheel crosses the tread, the angle between the tread and the bed is increased. There is a risk of rubbing the underside of the chassis, etc., so, for example, slightly lower the ground height at the rear of the platform by slightly bending the platform at the middle part in the longitudinal direction, and further lengthening the tread. This tread plate is connected to the rear part of the platform so as to be connected. If the tread length is simply increased, the ground height on the free end side of the tread increases when the tread is switched to the upright posture.Therefore, the tread is bent at the middle portion in the longitudinal direction and the ground is bent. Care is taken to keep the height low.

That is, a first frame is provided in the rear part of the loading platform so as to be rotatable around an axis along the trailing edge of the loading platform, and the free end side of the first frame is parallel to the axis of rotation of the first frame. The second frame is connected to the second frame so as to be rotatable about an axis, and a tread member is provided in each frame, and the first drive means for switching the first frame to a standing posture and the second frame By providing a second drive means for folding to the one frame side, the first frame is switched to a standing posture when traveling, and the second frame is folded to the first frame side, and when the vehicle is loaded and unloaded, the first and second By rotating the two frames, the tread members are arranged along the inclined bed surface at the rear of the bed.

[0004]

As described above, conventionally, the driving means for individually rotating the first and second frames is provided to switch the step plate of the refraction structure between the use posture and the folding posture. However, it is extremely difficult to switch between the two postures by matching the operations of the two sets of driving means, or the operation procedure is mistaken and the first frame in the standing posture is completely switched to the use posture. If the second frame is subsequently switched to the use posture, there is a problem in that the second frame is stuck on the ground and damages the pivotal attachment portions and the driving means of the first and second frames. In addition, there is a problem in that the cost is high because two sets of driving means are equipped.

The present invention has been made in view of the above circumstances, and provides a vehicle loading and unloading footboard which has achieved operability and cost reduction by rational improvement. The purpose is to do.

[0006]

[Means for Solving the Problems]

 The vehicle loading and unloading tread mounted on the rear portion of the loading platform of the vehicle carrier according to the present invention, which has achieved the above object, has a first frame which is rotated around an axis along the rear edge of the loading platform by the driving means. The second frame is provided at the rear part of the loading platform, and the second frame is rotatably connected to the free end side of the first frame about an axis parallel to the axis of rotation of the first frame, and each frame has a tread plate member. And a first flexible link whose contraction is restricted to a predetermined length is pivotally connected to the second frame in the vicinity of the rotation axis of the first frame, and both sides of the rear cargo bed. A guide rod is provided along the traveling direction of the carrier to pivotally connect the second link between the movable member slidable along the guide and the upper side of the first frame. Launching And a second locking means for releasably fixing the second frame to the first frame side when the moving member is releasably fixed to the bed side in the switching state to There is.

[0007]

According to the above characteristic configuration, the second frame is switched to the folding posture by its own weight in accordance with the switching of the first frame to the standing posture by the driving means, and the standing posture of the first frame. The folding postures of the first and second frames are fixed by the first and second locking means, respectively. On the other hand, when the first frame is turned down to switch to the use posture with the first and second locking means in the unlocked state, contraction of the first link is restricted during the switching, and the first frame and the first link are locked. The second frame is used to match the switching of the first frame to the use posture by the action of the holding member that pivotally holds the first frame, the first and second frames, and the action of the four-link mechanism by the four members of the first link. The posture is switched.

During the switching to the use posture, the free end of the second frame contacts the ground before the first frame is completely switched to the use posture. At this time, the free end of the second frame moves to the ground. By setting the contact point on the rear side of the loading platform with respect to the pivotal axes of the first and second frames, the first link extends after the first frame is turned over and the second frame extends. Rotates freely, and is finally switched to a use posture in which the tread plate members of the first and second frames are flattened.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a vehicle carrier, in which the platform 1 is slightly bent in the longitudinal middle portion to lower the ground level at the rear of the platform 1 and a vehicle loading / unloading tread 2 is provided at the rear of the platform 1. There is.

The vehicle loading / unloading tread 2 is configured as follows. That is, as shown in FIGS. 2 and 3, a pair of left and right holding members 3 are provided at the rear portion of the loading platform 1, and a long first frame 4 extending over the entire width of the loading platform 1 is attached via a shaft 5. The holding member 3 is pivotally attached to the holding member 3 and a pair of levers 6 are provided on the lower end side of the first frame 4, and a hydraulic cylinder (an example of driving means) 7 is connected to each of the levers 6. . Then, the second frame 8 having the same width as the first frame 4 is rotatably attached to the free end side of the first frame 4 via a hinge 9 having an axis parallel to the axis of the rotating shaft 5. The tread plate member 10 made of expansion metal or striped steel plate is provided on the first and second frames 4 and 8 so as to be connected to each other.

Then, the expandable and contractable first link 11 whose contraction is restricted to a predetermined length is provided with the support shafts 12 and 13 each having an axis parallel to the rotation axis of the rotation axis 5 via the support shafts 12 and 13. The first link 11 and the first and second frames 4 and 4 are pivotally connected to each other through the holding member 3 near the rotation axis of the first frame 4 and the longitudinal middle portion of the second frame 8. A quadruple link mechanism A is constituted by 8 and the holding member 3.

Further, guide rods 14 are provided on both sides of the rear loading platform 1 along the traveling direction of the carrier, and a tubular moving member 15 is provided so as to be slidable along the guide rods 14, and the guide members 14 are rotated respectively. The second link 18 is pivotally connected to the moving member 15 and the upper side of the first frame 4 via supporting shafts 16 and 17 having axes parallel to the rotation axis of the moving shaft 5. In the state where the hydraulic cylinder 7 switches the first frame 4 to the rising posture, the first locking means 19 for releasably fixing the moving member 15 to the bed 1 side, and the second frame 8 as the first frame. The second locking means 20 is provided on the fourth side and is fixed in the released state.

The first link 11 is composed of a tubular member 11a connected to the second frame 8 and a shaft member 11b fitted into the tubular member 11a and connected to the holding member 3. The contraction regulating member 11c with which the end of the tubular member 11a abuts is provided on the shaft member 11b, and when the first frame 4 is switched to the standing posture, the first link 11 The dimension between the pivots is set so that the arm is slightly stretched.

On the other hand, both the first and second locking means 19 and 20 have the same structure, and the second locking means 20 is used as an example, as shown in FIG. It consists of a moving lever b and a hook c for engaging and disengaging the swing link a, and the pivot point of the swing link a is the locking point of the swing link a with respect to the hook c and the rotation of the turning lever b. By crossing the line connecting the axis of motion and the upper and lower sides, it is possible to switch between the locked state and the unlocked state.

In the first lock means 19, a rotating lever b having a swinging link a is provided on the side of the loading platform 1 and a hook c for engaging and disengaging the swinging link a is provided on the moving member 15. ing. In the second locking means 20, the turning lever b having the swing link a and the hook c are both provided in the first frame 4, and the opening d for inserting and removing the hook c is provided in the second frame. 8, the second frame 8 is locked to the first frame 4 by locking the swinging link a with the hook c inserted through the opening d.

Although not shown in the drawings, a torsion spring for urging the second frame 8 rearward is provided at a hinge 9 portion for pivotally connecting the second frame 8 to the first frame 4. Then, the second frame 8 is fixed to the first frame 4 by the second locking means 20 while the second frame 8 is pressed against the biasing force of the spring.

The vehicle loading / unloading tread 2 according to the present invention has the above-mentioned structure, and when the hydraulic cylinder 7 switches the first frame 4 to the upright posture, the second frame 8 is folded under its own weight. Is switched to. In this state, the rising posture of the 1 frame 4 is fixed by the first locking means 19 via the second link 18, and the folding posture of the second frame 8 is fixed by the second locking means 20. However, in the fixation by the first locking means 19, the first frame 4 and the second link 18 form a three-point fixed triangle with respect to the loading platform 1 and the holding member 3 connected to the loading platform 1. It will be firmly fixed to the rear part of the loading platform 1 in the state of being presented.

In order to switch the tread 2 to the use posture for loading and unloading the vehicle, first, the fixation of the first and second frames 4 and 8 by the first and second locking means 19 and 20 is released, and the hydraulic cylinder 7 is used. The first frame 4 is turned down and the first frame 4 is switched to the use state. However, the contraction of the first link 11 is restricted during the switching, so that the quadruple link mechanism is used for the first time. The posture of A is determined, and by the action of the quadruple link mechanism A, the second frame is switched to the use posture in conformity with the switching of the first frame to the use posture. Grows (see Figures 2 and 5).

During the switching to the use posture, the free end of the second frame 8 comes into contact with the ground before the first frame 4 is completely switched to the use posture. At this time, the contact point P of the second frame 8 with respect to the ground is positioned so that it is located on the rear side of the loading platform 1 with respect to the pivot axes of the first and second frames 4 and 8, Since the dimensions are set, after this, the second frame 8 freely rotates while the first link 11 extends while the first frame 4 is turned over, and finally the first frame and the first frame are rotated. The tread plate member 10 of the two frames 4 and 8 becomes flat, and the switching of the vehicle loading / unloading tread 2 to the use posture is completed by the above process.

It should be noted that when the vehicle is loaded and unloaded with the footboard 2 switched to the use posture, the hinge 9 that pivotally connects the first and second frames 4 and 8 is prevented from being subjected to an unreasonable force of the vehicle weight. In order to do so, as shown in FIG. 6, a supporting member 21 that comes into contact with the ground when the tread 2 is switched to the use posture is provided near the hinge 9 of the second frame 8, and the tread 2 is folded. The withdrawal opening 22 of the support member 21 when the posture is switched is formed in the tread plate member 10 on the first frame 4 side.

[0021]

[Effect of device]

 As described above, according to the vehicle loading / unloading tread of the vehicle carrier according to the present invention, it is possible to match the switching between the use posture and the start posture by the driving rotation of only the first frame by the set of driving means. Then, the second frame can be switched between the use posture and the folding posture, and the cost reduction can be achieved by having one set of drive means, and the simple operation for the one set of drive means can be achieved. The first and second frames are matched to each other to switch between the use posture and the standing posture, so that the operability is improved without any erroneous operation such that the second frame is stuck on the ground. You can

[Brief description of drawings]

FIG. 1 is a side view of a vehicle carrier equipped with vehicle treads.

FIG. 2 is a perspective view of a vehicle loading / unloading tread.

FIG. 3 is an operation explanatory view of switching a vehicle loading / unloading tread into a folded state and a used state.

FIG. 4 is a perspective view of locking means.

FIG. 5 is an operation explanatory view of a vehicle loading / unloading tread plate.

FIG. 6 is a perspective view of the vicinity of the pivotal attachment portions of the first and second frames.

[Explanation of symbols]

1 ... Loading platform, 4 ... 1st frame, 7 ... Driving means, 8 ... 2nd
Frame, 10 ... Tread member, 11 ... First link, 14 ...
Guide rod, 15 ... Moving member, 18 ... Second link, 1
9 ... 1st locking means, 20 ... 2nd locking means.

Claims (1)

[Scope of utility model registration request] 1. A tread plate for loading and unloading a vehicle, which is mounted on a rear part of a carrier of a vehicle carrier, wherein a first frame which is rotated around an axis along a rear edge of the carrier by driving means is provided on the rear part of the carrier. , The second frame is rotatably connected to the free end side of the first frame about an axis parallel to the axis of rotation of the first frame, and each frame is provided with a tread plate member and has a predetermined length. The expandable first link whose contraction is restricted is pivotally connected to the vicinity of the rotation axis of the first frame and the second frame, and is provided on both sides of the rear cargo bed in the traveling direction of the carrier. A guide rod is provided along which the second link is pivotally connected to the movable member slidable along the guide and the upper side of the first frame, and further, in the state where the first frame is switched to the standing posture. , A vehicle carrier, comprising: first locking means for releasably fixing the moving member to the bed side; and second locking means for releasably fixing the second frame to the first frame side. Vehicle treads for loading and unloading.