JPH042851Y2 - - 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 is a structure described in Utility Model Application No. 1986-86147 previously filed by the applicant of the present invention.

That is, a lifting platform, also shaped like a U-shape in plan view, is placed on a frame having a U-shape in plan view and has wheels at the bottom so that it can move up and down, and the lifting platform is operated by an actuator that is stepped on or manually operated on the side of the frame. There was a structure in which a link mechanism was provided to move the frame up and down, and in addition to this link mechanism, a stopper mechanism was provided on the frame side to engage and disengage the lifting platform that was moved up and down by stepping on the frame.

(Problems to be solved by the invention) In the above conventional device, the operation of the link mechanism that moves the lifting platform upward and the operation of the stopper mechanism that locks the lifted platform must be performed separately. , This had the disadvantage that the operation was complicated.

Further, the stopper mechanism must be installed at a location that satisfies both a member portion having high strength and a location that is easy to operate, which has the disadvantage that the structural design of the truck becomes complicated.

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 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 engaged with the frame and the front end of the lifting platform is connected to the rear end of the link arm. In a simple trolley equipped with an actuating body that vertically rotates the front end of the link arm, an engaging body and an elastic body are rotatably connected in series to the front end of the link arm, and the elastic body is rotatably connected to the front end of the link arm. The front end of the engaging body is locked to the frame in front of the link arm, and in the middle of the movement trajectory of the engagement body front end as the link arm rotates, the engagement body protrudes slightly rearward from the middle of the movement trajectory, and the engagement body The frame is provided with a stopper whose front end can be engaged from behind.

(Function) Since the present invention has the above configuration, when the link arm operates in the forward and reverse directions, the lifting platform moves up and down with respect to the frame, and the rear end of the engaging body moves around the front end of the link arm. It moves up and down in an arc.

In addition, the front end of the engaging body is tensioned by the elastic body and moves upward and downward within the angle of the straight line connecting the vertical movement position of the rear end of the engaging body and the front end of the elastic body. It will be biased to move in the rear and front directions.

Therefore, when the engaging body moves upward due to normal operation of the link arm, its front part collides with the lower part of the stopper in the middle of the movement trajectory, and the upward movement is restricted against the reaction force of the elastic body. , move only backwards,
Thereafter, the engagement body is detached from the lower part of the stopper, moves upward by the reaction force of the elastic body, faces the rear of the stopper, and in this state, if the link arm is reversely operated, the engaging body can engage with the stopper.

In addition, if the link arm is operated normally to the upper limit in the above state, the front part of the engaging body will disengage from the stopper and move upward due to the reaction force of the elastic body, and will be located above the stopper, and in this state, the link arm will move. When reversely operated, the front part of the engaging body moves forward while sliding on the upper surface of the stopper, and then separates from the stopper,
It is moved to the initial position by the reaction force of the elastic body.

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

In the drawings, Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a cross-sectional side view of the main part thereof, Fig. 3 is an enlarged sectional view taken along the - line in Fig. 2, and Fig. 4 is a diagram showing the elevator platform. It is an explanatory view of a stopping device.

In FIGS. 1 and 2, A is a truck, and the main parts thereof include a frame 1, a lifting platform 6, a link mechanism 11, and a lifting platform locking device 15.

The frame 1 is constructed as follows.

That is, 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, forming a U-shape in plan view.

At the front ends of the side frames 2, 2 (right end in FIGS. 1 and 2), the upper parts of the wheels 4a, 4a are loosely engaged in the grooves, and the lower parts protrude downward, and pins are provided. It is rotatably supported by P1 and P1.

In addition, at the rear of both ends of the cross frame 3,
A pair of brackets 3a, 3a are fixed to protrude rearward, and wheels 4b, 4b made of casters are attached to the lower surfaces of these brackets, respectively.
A handle 5 bent in a U-shape is attached to the side of a and is detachably fixed upright at its lower part.

Moreover, the above-mentioned lifting platform 6 is constructed as follows.

That is, an upright wall 7 having a U-shape in plan view is provided along the inner wall on the opposing surface side of each side frame 2, 2 and the front wall of the cross frame 3. The upright wall 7 has a vertical dimension larger than the vertical dimensions of the side frames 2, 2 and the cross frame 3.

A lower shelf 8 extending inwardly and horizontally is fixed to the entire lower edge of the standing wall 7,
Further, an upper shelf 9 extending outward and horizontally is fixed to the entire upper edge of the standing wall 7.

The upper shelf 9 has a width that covers the upper front surface of the side frames 2, 2 and the cross frame 3.

Further, among the upper shelves 9, the upper shelves corresponding to the side frames 2, 2 have outer walls 10, 10 extending downward from their outer edges. It surrounds the outside.

Further, the link mechanism 11 described above is provided with the same configuration between each of the side frames 2, 2 and the lifting platform 6, and the link mechanism 11 on the right side will be explained with reference to FIG. do.

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 P2 has the rear end of each link arm 12 and 13 spanned in the groove of the side frame 2. P2, and the front ends of each link arm 12, 13 are rotatably connected to pins P3, P3, 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,
Actuating body 1 arranged upward and tilted toward the rear
The front end of 4 is fixed.

The actuating body 14 is bent into a U-shape in plan view, and both ends thereof are connected to each link arm 1 on the rear side.
It is fixed to the rear end of 3,13.

Here, when the rear part of the operating body 14 moves upward and the inclination angle of each link arm 12, 13 with respect to the ground is small, the lower shelf 8 is approximately 2 mm relative to the ground as shown by the solid line in FIG. Furthermore, when the rear part of the actuating body 14 moves downward and the inclination angle of each link arm 12, 13 increases, the lower shelf 8 is set as shown by the imaginary line in FIG. Set it so that it rises about 50mm from the ground.

In FIGS. 2 and 4, reference numeral 15 denotes a lifting platform locking device which constitutes the gist of the present invention, and is constructed as follows.

That is, the rear part of a rod-shaped engaging body 16 is rotatably connected to the front end of the rear link arm 13, and an elastic body 17 made of a coil spring is attached to the front end of this engaging body 16.
The rear end of the elastic body 17 is rotatably locked, and the elastic body 17
The front end of the link arm 13 is rotatably and tension-locked to a locking tool 18 that is vertically fixed to the bottom wall of the side frame 2 in front of the link arm 13. Note that 19 is a roller attached to the front end of the engaging body 16.

The engaging body 16 accompanying the rotation of the link arm 13
A stopper 20 is placed in the middle of the movement trajectory of the front end portion 16a.
are arranged and fixed to the side frame 2.

As shown in FIG. 4, 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 rearward from the middle of the movement trajectory of 16a.

According to the above embodiment, when the link mechanism 11 is operated, both the lower shelf 8 and the upper shelf 9 move up and down parallel to the side frames 2, 2.

Then, when the elevating and lowering locking device 15 is released, the elevating platform 6 is lowered relative to the frame 1 via the link mechanism 11, and the lower shelf 8 approaches the ground A as shown by the solid line in FIG. It turns out.

As a result, the lower shelf 8 corresponds to the conveyed object A with short legs as shown by the solid line in FIG.
It can be fitted onto the lower surface of the object to be transported. If the rear part of the operating body 14 is moved downward in this state, the link arms 12 and 13 will rotate to the left in FIG. In contrast, it moves upward and lifts the conveyed object A.

In addition, since the upper shelf 9 covers the upper surface of the side frames 2, 2, it is difficult to handle objects with relatively long legs or width, as shown by the imaginary lines in FIG. This corresponds to the upper shelf 9.

By the way, the lifting platform locking device 15 operates as follows by the operation of the link arm 13.

First, when the link arm 13 rotates left and right in FIG.
moves up and down in an arc around the front end (pin P2) of the link arm.

Further, the front end portion 16a of the engaging body 16 is connected to the elastic body 1.
7, the engagement body 16 moves backward and forward while moving upward and downward within the angle of the straight line connecting the upward and downward movement positions of the rear end 16b and the front end of the elastic body 17. It turns out.

In this case, when the engaging body 16 moves upward due to the left rotation of the link arm 13, the front end 16 of the engaging body 16 moves upward.
a collides with the lower part 20b of the stopper 20 in the middle of the movement trajectory, its upward movement is restricted against the reaction force of the elastic body 17, moves only backwards, and then it detaches from the lower part 20b of the stopper 20 and the elastic body 17 It moves upward due to the reaction force, and faces the engagement recess 20a at the rear of the stopper 20.

When the link arm 13 is rotated clockwise in this state, as shown by the dashed line in FIG. The link arm 13 is moved forward and fitted into the engagement recess 20a, thereby preventing further clockwise rotation of the link arm 13, and the lifting platform 6 is kept separated from the ground a. will be done.

Furthermore, when the link arm 13 is rotated to the left from this state to the upper limit, the roller 19 of the engaging body 16 is disengaged from the engaging recess 20a of the stopper 20 rearward, and is moved upward by the reaction force of the elastic body 17, and 4
As shown by the two-dot chain line in the figure, it is located above the stopper 20.

When the link arm 13 is rotated clockwise in this state, the roller 19 of the engaging body 16 moves forward while rolling on the upper surface of the stopper 20, as shown by the broken line in FIG. 4, and then separates from the stopper 20. death,
It is moved to the initial position by the reaction force of the elastic body 17 (the state shown by the solid line in FIG. 4).

(Effects of the invention) As is clear from the above explanation, the present invention is equipped with a lifting platform locking device that engages and disengages from the lifting platform in conjunction with the operation of the link arm that moves the lifting platform up and down. This has the effect of simplifying the process and facilitating the structural design of the truck.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a cross-sectional side view of the main part, and Fig. 3 is a -
FIG. 4, an enlarged cross-sectional view taken along lines, is an explanatory diagram of the lifting platform locking device. 1...Frame, 2...Side frame, 3...
Cross frame, 4a, 4b...wheels, 5...handle, 6...lifting platform, 11...link mechanism, 1
2, 13...link arm, 14...operating body, 1
5... Lifting platform locking device, 16... Engaging body, 16a
...Front end, 16b... Rear end, 17... Elastic body, 18... Locking tool, 19... Roller, 20...
Stopper, 20a... engaging recess, 20b... lower part, 20c... upper part.

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 and an elastic body are rotatably connected in series to the front end of the link arm, and the front end of the elastic body is rotatably connected to the front end of the link arm. is locked to the frame in front of the link arm, and in the middle of the movement trajectory of the front end of the engagement body as the link arm rotates, the front end of the engagement body protrudes slightly rearward from the middle of the movement trajectory, and the front end of the engagement body A lifting platform locking device for a simple trolley, characterized in that the frame is provided with a stopper that can be engaged from the rear.