JPH0410144Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a simple trolley for lifting and transporting cases containing parts, products, etc., or pallets on which the cases are placed.

(Prior Art) As an example of the prior art, there was a structure described in Utility Model Application No. 141495/1985, previously filed by the applicant of the present application.

This will be explained with reference to FIGS. 4 to 7.

In FIGS. 4 and 5, 1 is a frame formed in a U-shape in plan view, and this frame 1
, a pair of side frames 2, 2 bent into a U-shaped cross section are spaced apart from each other and arranged to extend parallel to each other in the front-rear direction (left-right direction in FIG. 1), and the rear end (left end in FIG. 1) are connected by a cross frame 3 bent in an inverted U-shape in cross section.

Wheels 4a, 4b are attached to the front ends of the side frames 2, 2 and both ends of the cross frame 3. Furthermore, handles 5 bent in a U-shape are detachably fixed upright at both ends of the cross frame 3.

An elevating table 6 formed in an inverted groove shape and a U-shape in plan view is fitted and mounted on the entire upper part of the frame 1 so as to be movable up and down.

This lifting platform 6 has a lower shelf 8 extending inwardly and horizontally from the entire lower edge of the standing wall 7 along the opposing inner walls of the side frames 2, 2 and the front wall of the cross frame 3. has. Note that 9 is an upper shelf that covers the entire upper surface of the side frames 2, 2 and cross frame 3.

Reference numeral 11 denotes a link mechanism for vertically moving the lifting table 6, and a link mechanism having the same configuration is provided between each side frame 2, 2 and the lifting table 6, of which the one on the right side is representative. This will be explained with reference to FIGS. 5 and 6.

Link arms 12 and 13 of equal length are arranged at the front and rear of the side frame 2 so as to be tilted upward toward the front, and the pin P1 is such that the rear ends of each link arm 12 and 13 are spanned across the groove of the side frame 2. P1, and the front ends of each link arm 12, 13 are rotatably connected to pins P2, P2, which are spanned between the upright wall 7 and the outer wall 10 at the front of the lifting platform 6. .

Then, at the rear end of the link arm 13 on the rear side,
It is made by fixing an actuating body 14 which is tilted upward toward the rear. The actuating body 14 is bent into a U-shape when viewed from above, and its both ends are fixed to the rear ends of each of the link arms 13, 13 on the rear side.

Reference numeral 15 denotes a lock mechanism for regulating the return of the link mechanism, which will be explained with reference to FIG.
The rear part of a rod-shaped engaging body 16 is rotatably connected to the front end of the rear link arm 13.
The rear end of an elastic body 17 made of a coil spring is rotatably locked to the front end of the link arm 13, and the front end of the elastic body 17 is fixed upright to the bottom wall of the side frame 2 in front of the link arm 13. It is rotatably tension-locked to the tool 18. Note that 19 is a roller attached to the front end of the engaging body 16.

In addition, the engaging body 1 due to the rotation of the link arm 13
A stopper 20 is disposed at the front end 16a of the roller 6, and therefore in the middle of the movement trajectory of the roller 19, and the side frame 2
Fixed to.

As shown in FIG. 7, this stopper 20 has an engagement recess 20a that is open at the rear and has an inverted C shape in side view. It is made to protrude slightly backward (to the left) from the middle of the movement trajectory of 16a.

Next, the above-mentioned conventional operation mode will be explained.

When the link mechanism 11 is actuated, the lifting platform 6 and thus the lower shelf 8 and the upper shelf 9 are both moved to the side frame 2,
It will move up and down parallel to 2.

In this case, first, when the link mechanism 11 is brought to the initial state shown in FIG. 7A, the lifting platform 6 descends from the frame 1, and as a result, as shown in FIG. The lower shelf 8 of the frame 1 corresponds to the lower surface of the conveyed object 25, and the upper shelf 9 of the frame 1 corresponds to the conveyed object 26 with long legs. It can be fitted onto the lower surface of the object 26.

In this state, when the link arm 13 is rotated to the left, that is, operated normally, the engaging body 16 moves upward, and the roller 19 at the front of the engaging body 16 collides with the lower surface of the lower part 20b of the stopper 20 in the middle of the movement trajectory, causing the elastic body 17 to move upward. After the upward movement is restricted against the reaction force and it moves backward horizontally, it separates from the lower part 20b and moves upward due to the reaction force of the elastic body 17, colliding with the lower surface of the upper part 20c of the stopper 20.

In this state, if the link arm 13 is rotated clockwise, that is, reversely operated, the roller 19 will fit into and lock in the engagement recess 20a of the stopper 20, as shown in FIG. 7A.

As a result, the lifting platform 6 is locked in a state raised by a predetermined amount from the frame 1, and the objects 25, 2 to be transported are locked.
6 will be lifted and held from the ground.

Next, if the link arm 13 is operated normally to the upper limit in the above state, the roller 1 will move as shown in FIG.
9 disengages from the engagement recess 20a and moves above the upper part 20c of the stopper 20 by the reaction force of the elastic body 17. When the link arm 13 is reversely operated in this state, the roller 19 rolls on the upper surface of the upper part 20c of the stopper 20. The platform 6 moves forward (to the right) while moving, and then detaches from the stopper 20 and returns to the initial state shown in FIG. 7A due to the reaction force of the elastic body 17. Objects to be transported 25, 26
will fall to the ground again.

(Problems to be Solved by the Invention) In the conventional device described above, only the return operation of the link mechanism 11 is restricted by the stopper 20. Therefore, in order to lock the lock mechanism 15, the link mechanism 11 is operated. When the link mechanism 11 rotates excessively, the front end of the engaging body 16 (roller 1
9) passed through the stopper 20, making it impossible to operate the lock mechanism 15.

Therefore, there was a drawback that the operation of the link mechanism 11 had to be repeated over and over again.

The object of the present invention is to obtain a new and simple lifting platform locking device for a trolley that eliminates the above-mentioned drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention is constructed as follows.

That is, a lifting platform is placed on a frame having wheels at the bottom so as to be movable up and down, a link arm whose rear end is rotatably connected to the frame and a front end to the elevator platform, and the link arm is connected to the rear end of the link arm. In a simple trolley equipped with an actuating body that rotates the front end in the vertical direction around A tensioning elastic body is provided at a midway position of the movement trajectory of the front end of the engagement body as the link arm rotates, and projects slightly rearward with respect to the middle of the movement trajectory, and the front end of the engagement body is fitted from behind. The stopper and the regulating body are provided behind the stopper and into which the front end of the engaging body can be fitted from the front, and the stopper and the regulating body are fixed to the frame.

(Function) Since the present invention has the above configuration, when the engaging body is moved rearward via the link arm,
When the actuation amount reaches a predetermined value, the front end of the engaging body fits into the regulating body, and further backward and upward movement is prevented.

Furthermore, when the engaging body is moved forward from this state via the link arm, the front end of the engaging body detaches from the regulating body and then fits into the stopper, preventing further forward and upward movement. will be done.

Then, when the engaging body is moved rearward again via the link arm, the front end of the engaging body disengages from the stopper, and then by moving the engaging body forward, the engaging body returns to its initial position. It turns out.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In the drawings, Fig. 1 is a sectional side view of the main part corresponding to Fig. 5 showing an embodiment of the present invention, Fig. 2 is a sectional plan view of the main part of the link mechanism, and Fig. 3 is an operation of the lifting platform locking device. It is an explanatory diagram showing a process.

In FIGS. 1 to 3, parts having the same reference numerals as those in FIGS. 4 to 7 have substantially the same structure as those in FIGS. 4 to 7.

In FIGS. 1 to 3, reference numeral 21 represents a regulating body that is a feature of the present invention.

As shown in FIG. 3, the regulating body 21 has its upper end 21a curved in the direction of the stopper 20 and is fixed upright on the bottom surface of the side frame 2 disposed behind (to the left of) the stopper 20.

The upper end portion 21a is connected to the lower portion 20 of the stopper 20.
The amount of gap toward the rear with respect to b is made slightly larger than the diameter of the roller 19, and is positioned slightly above the lower part 20b.

Further, the upper end portion 21a of the regulating body 21 has a downward clearance amount slightly larger than the diameter of the roller 19 with respect to the lower surface of the engagement recess 20a of the stopper 20, and the front end of the upper end portion 21a is connected to the upper portion of the stopper 20.
Position it directly below the rear end of 0c.

According to the above embodiment, when the link arm 13 is rotated to the left via the operating body 14 from the initial state shown in FIG. 21 and is fitted and locked to the upper end 21a, thereby preventing further left rotation.

Next, when the link arm 13 is rotated to the right, the roller 19 moves forward and is moved upward by the reaction force of the elastic body 21, and when it has rotated to the point F in Fig. 3, it is fitted and locked with the stopper 20. It turns out. As a result, the elevating table 6 is locked in a raised state from the frame 1.

Next, when the link arm 13 is rotated to the left to the maximum, the roller 19 moves rearward and disengages from the engagement recess 20a of the stopper 20, and is moved upward by the reaction force of the elastic body 21, as shown in FIG. As shown in Fig. 1, the stopper 20 is located above the upper part 20c and is removed from the stopper.If the downward pressure on the actuating body 14 is released in this state,
As in the past, the link mechanism 11 returns to the initial position as shown in FIG.
It will descend from

(Effect of the invention) As is clear from the above explanation, the present invention prevents the engaging body from moving excessively backward when the link arm rotates upward, by means of the regulating body placed behind the stopper. Therefore, it is possible to obtain a simple platform locking device for a trolley that has a simple structure and reliable operation.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional side view of the main part showing an embodiment of the present invention, Fig. 2 is a cross-sectional plan view of the main part of the link mechanism,
FIG. 3 is an explanatory diagram showing the operating process of the lifting platform locking device, FIG. 4 is a perspective view of a simple trolley to which the present invention is applied, and FIG. 5 is a sectional side view of main parts showing a conventional example thereof.
FIG. 6 is an enlarged sectional view taken along the line - in FIG. 5, and FIG. 7 is an explanatory diagram showing the operating process of the conventional lifting platform locking device. 1...Frame, 2...Side frame, 3...
Cross frame, 6... Lifting platform, 11... Link mechanism, 12, 13... Link arm, 14... Operating body, 15... Lock mechanism, 16... Engaging body, 1
6a... Front end, 16b... Rear end, 17... Elastic body, 18... Locking tool, 19... Roller, 20...
...stopper, 20a...engaging recess, 20b...lower part, 20c...upper part, 21...regulating body, 21a...
...Top end.

Claims (1)

[Scope of utility model registration request] A lifting platform is mounted on a frame having wheels at the bottom so as to be movable up and down, and a link arm whose rear end is rotatably connected to the frame and a front end to the elevator platform, and the link arm is centered around the rear end. In a simple trolley equipped with an actuating body that rotates the front end of the link arm in the vertical direction, an engaging body is swingably connected to the front end of the link arm, and the front part of the engaging body is tensioned forward and downward. An elastic body is provided at a position in the middle of the movement trajectory of the front end of the engagement body as the link arm rotates, the elastic body projects slightly rearward with respect to the middle of the movement trajectory, and the front end of the engagement body can be fitted from behind. A lifting platform for a simple type cart, characterized in that a stopper and a regulating body are provided behind the stopper into which the front end of an engaging body can be fitted from the front, and the stopper and the regulating body are fixed to a frame. Stop device.