JPH04254252A - Carriage having height-adjustable load receiving part - Google Patents

Abstract

PURPOSE:To promptly adjust supporting elastic force of an elastic body in accordance with weight of a load placed on a table by operating an exposed stopper tool connected and disconnected so as to easily adjust a number of a plurality of elastic bodies for use of supporting a carriage provided with the table. CONSTITUTION:When a load is placed on a table 40, weight of the load is transmitted to a carriage 30 through a connecting member 37 or the like, and the carriage 30 is lowered down against elastic force of a plurality of elastic bodies 52. On the other hand, when the load is removed from on the table 40, the carriage 30 and the table 40 are lifted by the elastic force of each elastic body 52. Here, a loading plate 65 is brought into contact with a loaded part 63, and a stopped part 62 is lifted a little and moderately stopped to a stopper tool 70. A positioning spring unit 75 is resiliently engaged with the stopper tool 70. When a small number of the elastic bodies 52 is unnecessary with the load in light weight, an operating part 71a corresponding to these bodies is turned to lift the positioning spring unit 75, and the elastic body 52 is held to a non-action condition by dislocating the stopper tool 70 from the stopped part 62.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trolley having an elevating load receiving section that allows articles such as parts to be always held at a constant height and to be loaded and unloaded in a comfortable posture.

0002

2. Description of the Related Art Conventionally, as this type of cart, there has been provided, for example, an automatic vertically movable work cart disclosed in Japanese Utility Model Publication No. 16427/1983. In this conventional type, the vehicle body is formed into a rectangular plate frame shape, wheels are disposed at the four corners of the vehicle body, and struts are erected from the rear of the vehicle body.

A mounting table that moves up and down while being guided by the support is provided, and a chain is disposed via a metering sprocket between the support and the upper part of the support. A movable sprocket is attached to the chain, and a plurality of springs are provided between the hanger plate to which the movable sprocket is attached and the vehicle body, as well as a hydraulic cylinder for fixation.

[0004] According to this conventional type, the mounting table is suspended via a group of springs, so when no article is placed on the mounting table, the restoring force of the spring group causes the support to be suspended above the support. It's being hoisted up. Then, when an article is placed on the mounting table, the tension applied to the chain causes the hanger plate to rise against the contraction force of the spring group, and the mounting table then descends in accordance with the load. Such an operation is performed with the hydraulic cylinder opened, and by appropriately closing the hydraulic cylinder, the mounting table stops at that position regardless of the load.

[0005]

However, according to the above-mentioned conventional type, since the upper and lower ends of the spring group are fixed to the hanger plate and the vehicle body, respectively, it cannot cope with changes in the maximum load.

In other words, when handling a load that always has the same maximum load, it is sufficient to set a spring group corresponding to the maximum load, but for a loading table with a spring group set corresponding to a certain maximum load, When a load with a light maximum load is placed, the platform does not descend sufficiently, and when a load with a heavy maximum load is placed, the platform reaches its lowering limit, and the platform does not lower until a considerable amount of parts are removed. In either case, it is difficult to work. To solve this problem, the number of springs to be applied can be changed depending on the load to be handled, but in this case, the work such as attaching and detaching the cover of the support column becomes troublesome.

It is an object of the present invention to have a lifting/lowering load receiving section that can be easily and easily adjusted in response to changes in the maximum load of the handled load, and that can stably maintain the adjusted posture. The point is to provide trolleys.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a truck having an elevating and lowering load receiving section, in which a support member is provided on a base having wheels, and a carriage which can be raised and lowered is provided on the support member side. , a table is provided on the carriage, a plurality of elastic bodies are provided between the upper part of the support member and the carriage, the lower ends of which are connected to the carriage, and the upper ends of some of the elastic bodies are connected to the support member, A plurality of locking tools, each of which can be freely engaged and detached from the upper end of the remaining elastic body, are swingably attached to the support member, and the swing operation tool is provided exposed on the support member, and the locking tools are A positioning spring body is provided to elastically determine the swing position.

[0009]

[Operation] According to the structure of the present invention, the table is suspended via the group of elastic bodies, so when no load is placed on the table, the restoring force of the group of elastic bodies causes the support member to suspended at the top. When a load is placed on the table in this state, the load is applied to the elastic body group via the carriage, and the table is lowered in accordance with the load against the elastic force of the elastic body group.

[0010] When handling a heavy load with the maximum load, the locking tool is swung against the positioning spring body through the exposed swinging operation tool to lock it to the upper end of the elastic body. Thereafter, the locking position may be fixed by a positioning spring body, thereby increasing the number of acting elastic bodies. Furthermore, when handling a load with a light maximum load, the number of acting elastic bodies may be reduced by the reverse operation to that described above.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 5 to 8, reference numeral 1 denotes a base, which is formed into an H shape by a pair of left and right side frames 1A and a transition frame 1B that connects the intermediate portions near the rear ends of these side frames 1A. Recessed part 1C before and after
, 1D. A front wheel 3 is attached to the front lower surface of the both-side frame 1A via a fixed bracket 2, and a rear wheel 5 is attached to the rear lower surface via a swing bracket 4. A reinforcing member 6 is attached within the both-side frames 1A, and corner members 7 made of resin are attached to the front and rear ends of the both-side frames 1A.

[0012] From the crossing frame 1B to the both side frames 1
A support member 10 is erected from the upper surface extending over A. This support member 10 includes a pair of left and right posts 11 erected from both side frames 1A, a lower beam 12 that connects the lower ends of these posts 11, and an upper beam 13 that connects the upper ends of the posts 11.
, a back panel 14 disposed between the rear surfaces of both posts 11 and both beams 12 and 13 , a front panel 15 disposed between the front surfaces of both beams 12 and 13 , and a section from the top end of both posts 11 to the upper beam 13 . It is composed of an upper resin cover 16 disposed across the upper surface.

[0013]The transition frame 1B and the lower beam 12
are removably connected by a plurality of fixing devices (bolts, etc.) 19, and vertical slits 1 are provided between the side edges of the front panel 15 and the inner surfaces of both posts 11, respectively.
7 is formed.

Both posts 11 are aluminum rails, and guide grooves 18 are formed over the entire length on their opposing inner surfaces. A handle 21 is provided on the rear side of the upper part of the support member 10. This handle 21 is attached to both posts 11
It consists of a pair of left and right brackets 22 fixed to the rear side and extending rearward, and a left-right pipe body 23 attached between the free ends of these brackets 22.

As shown in FIGS. 1 to 7, the support member 1
A carriage 30 that can be raised and lowered is provided inside the vehicle. This carriage 30 includes a pair of left and right side frames 31, a lower frame 32 connecting the lower ends of these side frames 31, an upper guide roller 34 attached to the upper outer surface of the both side frames 31 via roller pins 33, etc. A roller pin 3 is attached to the lower outer surface of the frame 31.
5, etc., and a connecting member 37 that is connected to the front from the lower part of both side frames 31. Both guide rollers 34 and 36 are made of resin and fit into the guide groove 18 of the post 11 to be guided up and down. Further, the connecting member 37 has the slit 1
7 and protrudes outward from the front of the support member 10, and can be moved up and down on the front side.

A table 40 is provided in front of the support member 10.
is provided, and the table 40 is fixed between a pair of left and right connecting members 37 via a connector 41. The table 40 includes a reinforcing member 42 that is U-shaped in plan view, and a resin plate 4 that is rectangular in plan view and is disposed to cover this reinforcing member 42.
3, and is fixed to the connecting member 37 via both free ends of the reinforcing member 42. The resin plate 43 has reinforcing rib portions integrally formed in a lattice shape on its lower surface side, and furthermore, a stopper portion 43a extending upward from the rear end is integrally formed.

Between the support member 10 and the carriage 30, there is provided an upward motion applying device 50 for upwardly biasing the carriage 30.
is provided. That is, within the frame of the carriage 30, a plurality of springs (seven in the embodiment) that are an example of an elastic body and which act in tension in the vertical direction are arranged in the left and right direction. Here, a pair of springs at both ends serve as stationary springs 51, and the remaining five serve as switching springs 52.

The lower ends of the pair of stationary springs 51 are connected to the lower frame 32 of the carriage 30 via a bolt-nut type lower connector 53 whose vertical position can be adjusted. The upper end is connected to the upper beam 13 of the column member 10 via an upper connector 54 formed of a bolt and nut whose vertical position can be adjusted. Here, the upper connector 54
The operating nut of is exposed above the upper beam 13.

A lower bracket 55 is attached to the lower end of the remaining switching spring 52. This lower bracket 55 has a long plate shape, and has a recess 5 on a pair of side surfaces thereof into which the lower part of the switching spring 52 is screwed.
6 is formed. And the bolt 5 that is integrally installed vertically
7 and nuts 58, the lower bracket 55 is connected to the lower frame 32 of the carriage 30.

An upper bracket 60 is attached to the upper end of the switching spring 52. The upper bracket 60 has an umbrella-shaped plate shape, and a recess 61 is formed at the lower part of a pair of side surfaces into which the upper part of the switching spring 52 is screwed. A through-hole-shaped locked part 62 is formed at the upper part of the center, and by bulging from the middle to the upper part of both sides, it is larger than the front and back width of the side frame 31 and has a horizontal shape. A receiving portion 63 is formed. As a result, a placed portion 63 and a locked portion 62 above the placed portion 63 are formed at the upper end of the switching spring 52.

A pair of front and rear mounting plates 65 are attached between the upper ends of both side frames 31 of the carriage 30, and triangular concave mounting plates are provided on the upper surfaces of these mounting plates 65 and at the pitches where the switching springs 52 are arranged. A placement portion 66 is formed. The placed portion 63 can be freely placed between the front and rear placing portions 66.

[0022] A plurality of locking tools 70 are provided on the support member 10, each of which can be freely engaged and detached from the locked portion 62 when the carriage 30 reaches its upper limit. That is, an operating pin 71 in the front-rear direction is rotatably attached to the upper beam 12, and this operating pin 71 is an example of a swing operating tool, and an operating portion 71a serving as one end thereof is connected to the support member 10.
exposed outside. The locking tool 70 has a hook shape, and by fitting its base onto the operating pin 71 and fixing it, the locking tool 70 can swing freely around the pin axis. Become free.

On the outer surface of the base of the locking tool 70, the surface that is the upper side when the locking tool 70 is in the hanging posture and the surface that is the upper surface when the locking tool 70 is in the locked posture in which the locking tool 70 is swung by 90 degrees. Recesses 72 and 73 for locking are formed on the upper surface, respectively.

A positioning spring body 75 is provided on the upper beam 13 to elastically perform positioning in two positions by swinging. These positioning spring bodies 75 are formed by deforming leaf springs, and have an upwardly curved part 75A that can be inserted from below into a rectangular hole 20 formed in the upper beam 12 at one end in the length direction. This curved portion 75A is formed with a barb 75B for preventing slippage. The other end in the length direction is set away from the lower surface of the upper beam 12, and a downward convex portion 75C is formed in the center of the other end, and the concave portion 72 is formed in the center of the other end. , 73 can be freely engaged.

A stopper 78 is provided on the lower surface of the tip of the table 40 and can come into contact with the upper surface of the side frame 1A when the table 40 reaches its lower limit. Reference numeral 79 denotes a load to be handled, which is formed, for example, by stacking cases containing a large number of articles in multiple stages.

Next, the state of use of the above embodiment will be explained. 1 to 8 show a state in which all of the locking devices 70 are in the active position. By placing the load 79 on the table 40 in this state, the load is transmitted to the carriage 30 via the connecting member 37, etc., and the carriage 30 is lowered against the elastic force of each spring 51, 52. At that time, all the springs 51 and 52 act, so the maximum load is 7.
Can handle 9. When the load is the maximum or exceeds the maximum load, a stopper 7 is attached to the bottom surface of the tip of the table 40.
8 comes into contact with the upper surface of the side frame 1A (see the imaginary line in FIG. 6), and the load is dispersed and supported via the stopper 78 and the connecting member 37.

The trolley supporting the load 79 as described above moves forward by being pushed by the operator through the handle 21. This can be done while positioning the toes near the recessed part 1D. Further, the operator moves backward by pulling the robot using the handle 21 while facing the direction of travel, and the operator can perform the pulling operation while positioning the heel near the recess 1D described above. Therefore, both hand-pushing and pulling can be performed without the foot colliding with the base 1 side.

After the load 79 is conveyed to a predetermined location via the cart, the articles are taken out one by one and processed, or assembled into other articles, for example. At this time, the load due to the load 79 will gradually decrease, and the spring 5 will respond accordingly.
The carriage 30 gradually rises due to the elastic force of the 1st and 52nd groups. As a result, the upper surface of the load 79 (the surface on which the article is taken out) is kept constant or almost constant. Then, when the load 79 on the table 40 becomes empty, the table 40 rises to the upper limit via the carriage 30.

As described above, when the carriage 30 is at the upper limit position, the placing portion 66 of the placing plate 65 abuts the placed portion 63 from below, lifts the locked portion 62 slightly, and locks the locking tool 70. It is in a state where it is loosely locked and supported by the mounting section 63. At this time, since the protrusion 75C of the positioning spring body 75 is elastically engaged with the recess 72 of the locking tool 70, the locking tool 70 will not swing unexpectedly.

When the load 79 to be handled is light and it is not necessary to use all the springs 51, 52, the number of springs used is reduced when the load 79 is empty. In other words, the operation pin 71 corresponding to the spring 52 to be switched to non-use is
A tool is set on the operating portion 71a and rotated. As a result, the convex portion 75C of the positioning spring body 75 moves upward against the elastic force, and the locking tool 70 is disengaged from the locked portion 62, so that the locking tool 70 is moved as shown by the imaginary line in FIG. becomes horizontal. At this time, the convex portion 75C of the positioning spring body 75 is elastically engaged with another concave portion 73.
Therefore, the horizontal posture of the locking tool 70 is maintained. Further, the upper end of the spring 52 which has become inactive is held in an orderly manner via the mounting plate 65 as described above.

[0031] In this way, the number of springs 52 acting can be changed depending on the maximum load of the load 79 to be handled. The above-mentioned lifting and lowering of the carriage 30 is carried out by using guide rollers 3 in the guide groove 18.
4,36 are guided along a fixed route. At this time, the upper guide roller 34 is guided by the front guide surface and the lower guide roller 36 is guided by the rear guide surface due to the unbalanced load applied to the table 40. Note that, for example, an empty case is removed or placed between the frames 1A on both sides using the lower part of the raised table 40.

[0032]

[Effects of the Invention] According to the present invention having the above-mentioned structure, the number of elastic bodies to be used can be easily and easily increased or decreased by locking and disengaging the exposed locking device, and the two positions of the locking device can be changed easily. This can be maintained by the elastic force of the positioning spring body, and adjustments can be made quickly in response to changes in the maximum load of the load to be handled.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and is a longitudinal sectional side view of an upward movement imparting device section.

FIG. 2 is a partially cutaway front view of the same.

FIG. 3 is an enlarged view of main parts in FIG. 2;

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a perspective view of the entire truck.

FIG. 6 is a partially cutaway side view of the same.

FIG. 7 is a cross-sectional plan view of the same.

FIG. 8 is a partially cutaway front view of the same.

[Explanation of symbols]

1 Base stand 3 Front wheel 5 Rear wheel 10 Strut member 11 Post 12 Lower beam 13 Upper beam 17 Slit 18 Guide groove 20 Rectangular hole 30 Carriage 37 Connecting member 40 Table 41 Connector 50 Upper motion imparting device 51 Fixed spring (elastic body) 52 Switching spring (elastic body) 55 Lower bracket 60 Upper bracket 61 Recessed part 62 Locked part 63 Placed part 65 Placement plate 66 Placement section 70 Locking tool 71 Operation pin (swing operation tool) 71a Operation section 72 Recessed part 73 Recessed part 75 Positioning spring body 75C Convex part 78 Stopper 79 Load

Claims (1)

[Claims] Claim 1: A support member is provided on a base having wheels, a carriage that can be raised and lowered is provided on the support member side, a table is provided on the carriage, and a table is provided between the upper part of the support member and the carriage. A plurality of elastic bodies are provided whose lower ends are connected to the carriage, and the upper ends of some of the elastic bodies are connected to the column member, and a plurality of locking devices that can be individually engaged and detached from the upper ends of the remaining elastic bodies are provided. It is characterized in that it is swingably attached to a support member, the swing operating tool is exposed to the support member, and a positioning spring body is provided for elastically positioning the swing position of the locking tool. A trolley with a lifting/lowering load receiving section.