JPH048088Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a pallet truck that holds workpiece loading pallets carried by a forklift at a required height in various manufacturing or assembly lines.

(Prior art and its problems) When supplying the required amount of workpieces such as various parts required to each workshop of various manufacturing or assembly lines, a pallet loaded with the required amount of the workpieces is transported from the workpiece storage area to a forklift. A commonly used method is to transport the pallet to the worksite using a truck and place it on a pallet rack installed at the worksite.

However, in the past, pallet racks were simply shelf frames for holding workpiece loading pallets at a height position suitable for work in each workplace, so when the workpieces on the pallet were used up and new workpieces were to be supplied. It was necessary to return the empty pallet to the work storage area or empty pallet storage area using a forklift, and then transport the work-loaded pallet to the work area. Therefore, in the past, the efficiency of work supply was poor, and work was sometimes interrupted while empty pallets were being returned.If the number of operating forklifts was increased to avoid this, equipment costs and personnel costs would increase. Therefore, a space is required to install a spare pallet truck, and in any case, a forklift still needs to be moved back and forth just to take out empty pallets.

This invention was made to solve the above-mentioned conventional problems, and provides a pallet truck that allows carrying a workpiece loaded pallet into a work site and taking out an empty pallet in one reciprocating motion of a forklift. It is intended to.

(Means for solving the problem) In other words, the palette truck according to this invention is
In order to achieve the above object, a pair of pallet receiving frames 2 are installed on the upper left and right sides of the box-shaped body frame 1 to support the left and right sides of the lower surface of the pallet 16, respectively, between the inwardly extending position and the upwardly facing position. The pallet receiving frames 2 on both sides are rotatably mounted on the inside of the main body frame 1 and have opposed tip portions 2 in an inwardly extending position.
A lifting platform 5 that is driven up and down between a and 2a is installed,
Swinging arms 9 are pivotally attached to the lower portions of the left and right sides of the main body frame 1 at their intermediate portions so as to be able to swing up and down, and the inner end portions 9a of each swinging arm 9 are connected to the side lower surface 5a of the lifting platform 5.
and the outer end 9b of the swing arm 9.
A connecting rod 11 is pivotally connected at its upper and lower ends between the pallet receiving frame 2 and the outwardly extending portion 2b of the pallet receiving frame 2, and a spring member 14 is provided which biases the connecting rod 11 in the downward direction. When the platform 5 is in the lowered position pushing down the inner end 9a of the swinging arm 9, the connecting rod 11 is pushed up by the outer end 9b of the swinging arm 9, so that the pallet receiving frame 2 is in an inwardly extending position. It is composed of.

(Function) In the lowered position of the lifting platform 5, the inner end 9a of the swinging arm 9 is pushed down by the side lower surface 5a, so the connecting rod 11 is in the raised position and the pallet receiving frame 2 is directed inward. It is held in an extended position, and a pallet 16 can be placed on the receiving frame 2 (see FIG. 3).

Next, when the workpieces 15 on this pallet 16 are used up and the empty pallet 16 is replaced with a pallet 16 on which a new workpiece 15 is placed, the lifting platform 5
When the pallet is raised, the empty pallet 16 is transferred from the pallet receiving frame 2 to the lifting platform 5. Thus, the pallet receiving frame 2 maintains an inwardly extending position due to the weight of the empty pallet 16 while the lifting platform 5 is rising, but when it is released from the weight by the above-mentioned transfer, it begins to oscillate. Since the arm 9 is released from the pushing down of the inner end 9a by the lifting table 5, it is rotated by the accumulated force of the spring member 14 so that the outer end 9b is at the lower side, and the connecting rod 11 is lowered accordingly. As a result, it is rotated to an upward position. This results in
The empty pallet 16 can be lowered between the pallet receiving frames 2, 2 (see FIG. 4).

Therefore, when the lifting table 5 is machined, the empty pallet 16 is stored in the lower part of the main body frame 1, and the inner end 9a of the swing arm 9 is pushed down again by the lifting table 5, so that the pallet receiving frame 2 is pushed up by the connecting rod 11 and returns to the inwardly extending position. Therefore, a pallet 16 carrying a new work 15 carried by a forklift can be placed on this pallet receiving frame 2, and following this placement, an empty pallet 16 waiting at the bottom can be placed on the fork. It can be carried out using a lift.

As described above, in the pallet truck of the present invention, the pallet receiving frame 2 is connected to the swing arm 9 and the connecting rod 11 through the consistent link connection.
In conjunction with the lifting and lowering of the lifting platform, the pallet 16 can be reliably and automatically changed between an inward extending position where the pallet 16 is placed and an upward position where the pallet 16 can be lowered by the lifting table 5, resulting in reliable operation. Excellent in sex.

(Example) This invention will be explained below based on the illustrated example.

In the drawing, reference numeral 1 denotes a box-shaped main body frame, and pillars 1b and 1c made of angle iron are erected at the four corners of a substantially square base frame 1a. A side frame 1d is installed between the upper ends of each support column 1c, and a rear frame 1e is installed between both the rear support columns 1c, 1c. Therefore, the front column 1b is the rear column 1c.
It is set higher, and each side frame 1d is highly inclined toward the front.

2 is the upper part of the left and right sides of the main body frame 1 and the side frame 1d
The pallet receiving frame is a pallet receiving frame attached directly below the pallet receiving frame, in which a band-shaped metal plate is bent so as to form two continuous high and low surfaces in the longitudinal direction with the stepped portion as a boundary, and the pallet receiving frame 2a and the pallet receiving frame forming the inner low surface. It has an outwardly extending portion 2b constituting an outer high surface. Further, on the lower surface side of the outwardly extending portion 2b, a reinforcing member 3a along the longitudinal direction is disposed at an inward position, and the member 3a is provided with a reinforcing member 3a that is attached to the pallet receiving portion 2a.
Reinforcing bars 3b that support the outer extension portion 2b and reinforcing bars 3c that support the outwardly extending portion 2b are fixedly provided at required intervals along the longitudinal direction. However, pallet receiving frame 2
In a, metal mounting plates 2c are attached to the central part of both ends in a hanging shape, and a pivot pin 4a is attached to a bracket 4 fixed to the upper part of the pillars 1b, 1c of the main body frame 1 at the bottom of each mounting plate 2c. It is pivotally connected via the. This rotation range includes an inwardly extending position in which the pallet receiving portion 2a is held horizontally by the side frame 1d;
It is also regulated to be between the upward posture and the upward posture.

Reference numeral 5 designates a lifting platform installed on the base frame 1a inside the main body frame 1, and a pivot 6c is installed between the intersections of supporting legs 6a, 6a, which are provided on both left and right sides of the lower surface and arranged in an X-shape. , is configured to move up and down by the telescopic drive of a hydraulic cylinder 7 disposed between the base frame portion 1a and a support rod 6b installed between the supporting legs 6a, 6a on both sides at a higher level than this pivot axis. There is. Therefore, the position and the width in the left and right direction of the lifting table 5 are set so that it can fit between the tip portions of the pallet receiving parts 2a, 2a with a certain distance between them when the pallet receiving frames 2, 2 on both sides are in the inwardly extending position.

On the other hand, at the bottom of the left and right sides of the main body frame 1, brackets 8 are provided upwardly protruding from the base frame portion 1a at two locations, front and rear, slightly inside of the support columns 1b and 1c, respectively. Opposing 2
A strip-shaped swinging arm 9 is attached to the pivot pin 8 at the tip of the strip.
It is pivoted at its intermediate portion via a to be able to swing up and down. This swinging arm 9 has a roller 10 pivotally attached to its inner end 9a, and its outer end 9b is pivotally attached to a U-shaped mounting member 11a fixed to the lower end of a connecting rod 11 via a connecting pin 12a. ing. Further, the connecting rod 11 is pivotally connected to a mounting piece 2d protruding from the lower surface of the outwardly extending portion 2b of the pallet receiving frame 2 via a U-shaped mounting member 11b fixed to the upper end and a connecting pin 12b. ing. Thus, the inner end 9a of the swing arm 9 is arranged so that the roller 10 comes into contact with the side lower surface 5a of the lifting platform 5 in the lowered position, and the inner end 9a is located close to the base frame 1a.
A coil spring 14 is engaged between the coil spring 14 and an inverted U-shaped locking fitting 13 fixed to the coil spring 14 so as to bias the connecting rod 11 in the downward direction with its accumulated force. Since the pallet receiving frame 2 is arranged at an angle along the side frame 1d, the bracket 8, swing arm 9, and connecting rod 11 are arranged at an angle of 90° with respect to the pallet receiving frame 2. There is.

In the pallet rack having the above configuration, when the lifting platform 5 is in the lowered position, the inner end 9a side of the swinging arm 9 is pushed down against the bias of the coil spring 14 on the lower surface of the side thereof, and the upper The connecting rod 11 raised at the bent outer end 9b pushes up the outwardly extending portion 2b of the pallet receiving frame 2, and the pallet receiving frame 2 is held in an inwardly extending position. Therefore, in this state, as shown in FIGS. 2 and 3, the pallet receiving portions 2 of the pallet receiving frames 2, 2 on both sides
A pallet 16 loaded with works 15 carried by a forklift can be placed and held on a and 2a. The reason why the pallet receiving frame 2 is tilted high forward is because the pallet 16 placed thereon is tilted so that the workpiece 1 can be
5 to the rear side, that is, the operator's side, to take them out.

Next, when all the workpieces 15 are used up and the pallet 16 becomes empty and a new workpiece 15 is to be supplied, the lifting table 5 is raised and the pallet 16 is placed on the lifting table 5 as shown in FIG. lift. As the lifting table 5 rises, the inner end 9a of the swinging arm 9 separates from the lifting table 9, but the weight of the pallet 16 keeps the pallet receiving frame 2 in an inwardly extending position until just before the pallet 16 is lifted. Ru. At the same time as the pallet 16 is lifted, the pallet receiving frame 2 is released from its weight.
As the connecting rod is lowered by the tensile force of the coil spring 14, it is rotated to an upward position as shown in the figure. Then, by lowering the lifting table 5, the empty pallet 16 is lowered to the lower part of the main body frame 1 while remaining on the lifting table 5. When the lifting table 5 reaches the lowered position, the inner end of the upper swing arm 9 is pushed down, and as a result, the pallet receiving frame 2 returns to the inwardly extending position and a new workpiece 15 is loaded. It becomes possible to place the loaded pallets 16.

Therefore, according to the above-configured palette track,
The pallet 16 loaded with the workpieces 15 is placed on the pallet receiving frame 2 using a forklift, and then the empty pallet 16 placed on the lifting platform 5 and located below the main body frame 1 is taken out and placed in a workpiece storage area or in an empty space. The pallet can be returned to the pallet storage area, and workpieces can be supplied and empty pallets can be taken out in one round trip of the forklift.

In the above embodiment, the pallet receiving frame 2 is arranged in an inclined manner, but in this invention, it may be arranged horizontally. Furthermore, as shown in the figure, the pallet 16 has an outer leg portion 16a that rests on the pallet receiving frame 2 and an inner leg portion 16b that rests on the lifting platform 5, but the pallet rack of this invention can be used in various ways, such as an ordinary flat pallet for cargo handling. Applicable to pallets with the shape of

(Effects Unique to the Invention) According to the pallet truck of this invention, the pallets placed on the pair of left and right pallet receiving frames at the top of the box-shaped main body frame can be made to wait at the bottom of the main body frame using the lifting platform. Therefore, the forklift can carry in a pallet loaded with workpieces and take out an empty pallet in one reciprocating motion of the forklift, and there is no need to reciprocate the forklift just to take out an empty pallet as in the past. It has the advantage of extremely high efficiency in supplying workpieces, and avoids interruption of work while returning empty pallets and cost increases due to an increase in the number of operating forklifts.

Moreover, in this pallet rack, the pair of pallet receiving frames are linked to the lifting and lowering of the lifting platform through a very simple link connection consisting of a connecting rod and a swinging arm, so that the pallets can be placed thereon. The pallet can be reliably and automatically changed between the inward extending position and the upward position in which the pallet can be lowered by the lifting platform, and it has extremely high operational reliability, and the overall device configuration is simple and low cost. It has the advantage of being manufacturable.

[Brief explanation of the drawing]

The drawings show an embodiment of the pallet truck according to the invention, in which Fig. 1 is a plan view of the whole, Fig. 2 is a side view of the whole with pallets placed on it, and Fig. 3 is a diagram illustrating Fig. 2. Fig. 4 is a longitudinal sectional view of the pallet lifted up on the lifting platform, Fig. 5 is a side view of the main part of the operating part of the pallet receiving frame, and Fig. 6 is the same as Fig. 1. It is a sectional view taken along the - line. 1... Body frame, 2... Pallet receiving frame, 2a...
Pallet receiving part (tip part), 2b... outwardly extending part,
5... Lifting platform, 9... Swinging arm, 9a... Inner end, 9b... Outer end, 11... Connection rod, 16
...Palette.

Claims (1)

[Scope of utility model registration request] A pair of pallet receiving frames that respectively support the left and right sides of the lower surface of the pallet are pivotally attached to the upper left and right sides of the box-shaped main body frame, allowing them to freely rotate between an inwardly extending position and an upwardly extending position. Inside, a lifting platform is installed that moves up and down between the opposing tips of the pallet receiving frames on both sides when they are in the inwardly extending position, and at the bottom of both left and right sides of the main body frame, swinging arms are installed between them so that they can swing up and down. The inner end of each swinging arm is disposed on the lower side surface of the lifting platform, and the outer end of the swinging arm and the outwardly extending part of the pallet receiving frame are provided. The connecting rod is pivotally connected at its upper and lower ends and is provided with a spring member that biases the connecting rod in the downward direction, and when the lifting platform is in the lowered position pushing down the inner end of the swinging arm, the swinging arm A pallet rack configured such that a connecting rod is pushed up by the outer end of the pallet receiving frame so that the pallet receiving frame is in an inwardly extending position.