JPH04368281A - Cart having ascending/descending cargo receiving unit - Google Patents

Abstract

PURPOSE:To enable multistage loading of cargoes and transport to be carried out stably by arranging a support member on a base stand having wheels, arranging a carriage having a table capable of ascending/descending freely, arranging a rising/lowering device to keep the upper parts of cargoes to be loaded at a constant height between the carriage and the support member, and arranging a cover on the table opening surface. CONSTITUTION:Under a condition that the upper side of a table 40 whose upper surface is projecting upward from the upper edge of a cover body 25 is empty, a cart is forced to travel to a supply section. When a case 62 is loaded on the table 40, load is transmitted to a carriage 30 through a connecting member 37 and so on, and the carriage 30 is lowered against elastic force of respective springs. The table 40 and cargoes to be loaded 61 are lowered inside of the cover body 25 by means of a rising/lowering device 50 operated by the load of a case 62 group. In this case, all springs are operated, so that the largest load cargo to be loaded can be handled. In both hand push travel and hand pull travel through a hand hold 21, operation can be carried out without bumping feet against the base stand 1 side as well as collage of stack of the cargoes can be prevented by means of the cover body 25.

Description

[Detailed description of the invention]

0001

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

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. For example, when articles are placed in a stacked manner on a loading table in the article supply section, the tension applied to the chain causes the hanger plate to rise against the contracting force of the spring group, causing the loading table to move in response to the load. It will go down.

[0005] The work cart carrying a predetermined number of tiers of articles in this manner is driven to, for example, an article processing section, and is unloaded one by one starting from the top tier. At this time, the mounting table rises as the load decreases, thereby making it possible to keep the level of the top stage approximately constant.

[0006]

[Problems to be Solved by the Invention] According to the above-mentioned conventional type, since both sides of the mounting table are open, when small articles are stacked in multiple stages and placed on the mounting table in the article supply section, Part or all of the article may fall off the open side during travel to the article processing station. Furthermore, during unloading work in the article processing section, there is also a risk that the articles will collapse in a similar manner.

An object of the present invention is to provide a trolley having an elevating and lowering load receiving section that can stably stack and transport articles in multiple stages.

[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, and between the support member and the carriage,
A lifting device is provided that lifts and lowers the table according to the load to maintain the upper part of the placed object at a constant height, and a cover body is disposed on at least one of the open surfaces of the lifting path of the table. There is.

[0009]

According to the structure of the present invention, when no object is placed on the table, the table is positioned above the support member by the elevating device. When an object is placed on the table in this state, the table is lowered in accordance with the load by the lifting device that operates in accordance with the load.

[0010] By sequentially placing the objects on the table, the table and the objects move downward on the inner side of the cover body, and therefore, the objects on the table may collapse during transportation or unloading. It is caught by the cover body and will not fall off.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 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, and has a recessed portion 1C at the front and rear of this transition frame 1B. , 1D. A front wheel 3 is attached to the front lower surface of the both-side frame 1A via a swing bracket 2, and a rear wheel 5 is attached to the rear lower surface via a pivot bracket 4. A reinforcing member 6 is installed inside the frame 1A on both sides, and corner members 7 made of resin are attached to the front and rear ends of the frame 1A on both sides.
can be installed.

[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.

A carriage 30 is provided within the support member 10 and is movable up and down. 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. It is composed of a lower guide roller 36 attached to the outer surface of the lower part of the frame 31 via a roller pin 35 or the like, and connecting members 37 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 passes through the slit 17 to support the support member 1.
It protrudes outward from the front of the 0 and can be raised and lowered freely 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.

An elevating device 50 is provided between the support member 10 and the carriage 30 for elevating and lowering the table 40 according to the load to maintain the upper part of the object at a constant height. 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 is secured to the carriage 30 by bolts and nuts.
It is connected to the lower frame 32 of. Further, an upper bracket 56 is attached to the upper end of the switching spring 52. A locking portion 57 in the form of a through hole is formed at the upper center of the upper bracket 56 . Then, the locked portion 5
A plurality of locking devices 58 are provided on the pillar member 10, each of which can be freely engaged and detached from each of the locking devices 7.

That is, an operating pin 59 in the longitudinal direction is rotatably attached to the upper beam 12, and one end of the operating pin 59 is exposed outside the support member 10. The locking tool 58 has a hook shape, and by fitting its base onto the operating pin 59 and fixing it, the locking tool 58 can swing freely around the pin axis. Become free.

A stopper 60 is provided on the lower surface of the tip of the table 40, which can come into contact with the upper surface of the side frame 1A when the table 40 reaches its lowering limit. Reference numeral 61 denotes an object to be handled, which is formed, for example, by stacking cases 62 containing a large number of objects in multiple stages.

Cover bodies 25 are disposed at positions corresponding to both sides of the open surface of the lifting path of the table 40. This cover body 25 is formed into a rectangular shape from a flat plate or perforated plate made of resin, rubber, or metal, or a mesh plate or net, and has its lower edge fixed to the side frame 1A, and
One side edge is fixed to the post 11. Here cover body 2
5 is set so that it does not protrude from the top surface of the table 40 when the empty table 40 is at its upper limit.

However, the cover body 25 may have a protruding height depending on the purpose of use, or may be provided only on one side, only on the front, or even on all three sides including the front. may be provided. The cover body 25 may be configured to be detachable from the side frame 1A or the post 11 without being fixed to the side frame 1A or the post 11 as described above. Further, the upper end of the cover body 25 is formed to be rounded.

Next, the state of use of the above embodiment will be explained. The figure shows a state in which all the locking devices 58 are in the active position. At this time, the table 40 is empty, and this table 40
is located at the upper limit as shown by the solid line in FIG. 2, and its table top surface projects upward from the upper edge of the cover body 25. In this state, the cart is driven to the supply section. Then, by placing the case 62 on the table 40 in the supply section, 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. .

By sequentially placing the cases 62 in this manner, the table 40 and the objects 61 are moved inwardly toward the side of the cover body 25 according to the load by the lifting device 50 that operates according to the load of the case 62 group. go down.

At this time, since all the springs 51 and 52 act, the object 61 with the maximum load can be handled. When the load exceeds the maximum load, table 4
The stopper 60 attached to the lower surface of the tip of the side frame 1
A (see the imaginary line in FIG. 2) contacts the upper surface of A, and the load is dispersed and supported via the stopper 60 and the connecting member 37.

The trolley supporting the object 61 as described above moves forward by being pushed by the operator using the handle 21. This can be done while positioning the toes near the recessed part 1D. Also, the operator should hold the handle 21 in a posture facing the direction of travel.
The vehicle moves backward by pulling through the recessed portion 1D.

[0028] Therefore, both hand-push running and pulling running,
This can be done without the foot colliding with the base 1 side. Moreover, when the loaded object 61 is about to collapse during such traveling transportation, the cover body 25 receives the case 62 that is about to collapse, thereby preventing the load from collapsing.

After the object 60 is transported to a predetermined location, such as a processing section, via the cart, the object 60 is transferred to the case 6, for example.
Items are taken out one by one from inside 2 and processed, or assembled into other items. At that time, the load due to the placed object 60 will gradually decrease, and the spring 5 will be
The carriage 30 gradually rises due to the elastic force of the 1st and 52nd groups. As a result, the upper surface of the placed object 60 (the surface on which the object is taken out) is kept constant or almost constant.

Then, the empty case 62 is removed or placed between the frames 1A on both sides using the lower part of the elevated table 40. When removing the case 62 or taking out the above-mentioned article, when the loaded object 61 is about to collapse due to catching or friction, the case 62 is similarly received by the cover body 25. When the object 60 on the table 40 becomes empty in this way, the table 40 is raised to the upper limit via the carriage 30.

When the load of the object 60 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 object 60 is empty. That is, the operating pin 59 corresponding to the spring 52 to be switched to non-use is rotated by setting a tool in the operating portion thereof. As a result, the locking tool 58 is removed from the locked portion 57, so that the locking tool 58 becomes horizontal. In this way, the number of springs 52 acting can be changed depending on the maximum load of the object 60 to be handled.

[0032] In the above embodiment, the lifting device 50 uses a spring, but it may also be driven by a motor and a battery.

[0033]

[Effects of the Invention] According to the present invention having the above structure, when no object is placed on the table, the table can be positioned above the support member by the lifting device, and the object cannot be placed on the table. Then, the table can be lowered according to the load by means of a lifting device that operates according to the load.

When the objects are placed one after another in this way, the table and the objects can be lowered on the inside of the cover body, so that if the objects are about to collapse during traveling or unloading, the cover will collapse. You can catch it with your body and prevent it from falling off. This makes it possible to stably stack and transport articles in multiple stages.

[Brief explanation of drawings]

FIG. 1 shows one embodiment of the present invention, and is a perspective view of the entire truck.

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

FIG. 3 is a cross-sectional plan view of the same.

FIG. 4 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 17 Slit 25 Cover body 30 Carriage 37 Connecting member 40 Table 41 Connector 50 Lifting device 51 Fixed spring (elastic body) 52 Switching spring (elastic body) 61 Placed objects 62 case

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 support member and the carriage according to the load. The table is characterized by being provided with a lifting device that lifts and lowers the table to maintain the upper part of the object placed at a constant height at all times, and a cover body is disposed on at least one of the open surfaces of the lifting path of the table. A trolley with a lifting/lowering load receiving section.