JPH0447129Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a running fork type load transfer device installed above the elevating and lowering carriage of a traveling crane for loading and unloading in an automated warehouse. The present invention relates to a load supporting surface structure of a primary fork for supporting loads.

(Prior art and its problems) This type of running fork type load transfer device is
The fork includes a secondary fork that is supported so as to be movable in and out of the fixed fork, and a primary fork for supporting a load that is supported so as to be movable in and out of the secondary fork.
Since the loaded pallets being handled are often deformed in such a way that the center part is lowered due to the relationship between being supported by a pair of left and right receiving bars on the shelf side, it is necessary to stably support the pallets. for,
For example, as disclosed in Microfilm of Japanese Utility Model Application No. 57-84651, it is preferable that the widthwise central portion of the load-supporting primary fork be recessed over its entire length.

However, in the conventional device as disclosed in the above-mentioned known example, a pair of left and right guide rails attached to the secondary fork are attached to the bottom of the recessed flat groove formed in the center of the load supporting primary fork. Since a side frame is attached to pivotally support a roller that fits into the recessed flat groove, the primary fork load supporting surface, which is raised one step higher on both the left and right sides of the recessed flat groove, is at least as high as the recessed fork. The height increases by the depth of the flat groove.

In other words, the overall height of the running fork type load transfer device becomes high, and the center of gravity becomes high when a loading pallet is mounted, causing problems in stability. Furthermore, when moving into the shelf for loading and unloading, a portion of the secondary fork also enters the shelf, so the height of the fork entry space that must be secured on the shelf side must be increased. This also leads to a decrease in shelf storage efficiency.

(Means for Solving the Problems) The present invention proposes a running fork type load transfer device capable of solving the conventional problems as described above, in which a load supporting surface of the primary fork is configured. A recessed flat groove of an appropriate width is formed on the flat plate at the center in the left and right width direction by bending the flat plate over the entire length in the direction of movement. It is characterized in that bearing side frames are attached to the left and right bottom surfaces of the flat plate, respectively, and rollers that fit into a pair of left and right guide rails attached to the secondary oak are pivotally supported on these side frames.

(Embodiment) An embodiment of the present invention will be described below based on the attached illustrative drawings. 1 is a fixed fork, 2 is a secondary fork, and 3 is a load-supporting primary fork. The fixed fork 1 has a pair of left and right side frames 5 fixed to both sides of the base plate 4, and the secondary fork 2 has a pair of left and right side frames 5 fixed to the sides of the fixed fork 1. A pair of left and right guide rails 6 located parallel to each other are connected and integrated by a band-shaped plate 7. Also, primary fork 3
A load supporting flat plate 9 having the same width as the fixed fork 1 is fixed on a pair of parallel left and right side frames 8 located inside the pair of left and right guide rails 6 of the secondary fork 2.

Inside the both side frames 5 of the fixed fork 1, there are grooves located at both longitudinal ends and the center so as to fit into the outer grooved rail portions 6a of the guide rails 6 of the secondary fork 2. Three pairs of main rollers 10 to 12, two pairs of sub rollers 13 and 14 located on both front and rear sides of the main roller 12 in the center, and four pairs of sub rollers 13 and 14 that are in contact with the side surfaces of the outer groove-shaped rail section 6a.
A pair of vertical shaft rollers 15 for steady rest are pivotally supported.

The load supporting primary fork 3 has a support roller 16 pivotally supported by both side frames 8 so as to fit into the inner grooved rail portions 6b of the pair of left and right guide rails 6 in the secondary fork 2, and a steady rest. It is supported by the secondary oak 2 by vertical shaft rollers 17 so as to be movable in and out of the secondary oak 2. The arrangement of the supporting roller 16 and the steady rest vertical shaft roller 17 is the same as the arrangement of the rollers 10 to 14 that support the secondary oak 2 and the steady rest vertical shaft roller 15.

The means for driving the secondary fork 2 and the primary fork 3 into and out is conventionally known.
That is, a drive gear wheel 19 that is pivotally supported by the fixed fork 1 and interlockingly connected to the drive motor 18, and guide gear wheels 20a to 2 that are pivotally supported by the fixed fork 1.
0d, and a secondary oak driving chain 21 which is hung from these gear wheels 19 to 20d as shown in FIG.
Then, one end 22a, 23a is locked in a position near both ends of the fixed fork 1, and the other end 22b, 23b is locked in a position near both ends in the length direction of the primary fork 3, and near both ends in the length direction of the secondary fork 2. Guide gear wheels 24, 2 pivotally supported in position
It is composed of two primary fork drive chains 22 and 23 which are hung from the main fork.

Therefore, when the drive gear 19 is rotated clockwise in FIG. 4, the secondary fork drive chain 21 is rotated so that one end 21a is pulled and the other end 21b is sent out, so that the fixed fork 1 On the other hand, the secondary oak 2 is pulled by one end 21a of the chain 21 and advances to the right as shown in the figure. As the secondary oak 2 advances to the right, the primary fork driving chain 22 pulls out the primary fork 3 to the right relative to the secondary oak 2, so the primary fork 3 advances to the right relative to the secondary oak 2. do. Figure 1, Figure 2,
FIG. 4 shows a state in which the secondary fork 2 and the primary fork 3 have advanced to the right exit limit position. Further, by reversing the drive gear 19, the secondary fork 2 and the primary fork 3 can be advanced to the leftward extension position.

In the running fork type load transfer device as described above, the flat plate 9 constituting the load supporting surface of the primary fork 3 for load support is provided with a flat plate 9 at the center in the left and right width direction and at the left and right sides of the bottom surface as shown in the third figure. Between the pair of side frames 8 attached on both sides, a recessed flat groove 26 of an appropriate width is formed by bending the flat plate 9 over the entire length in the direction of movement.

Further, in this embodiment, a flat protruding portion 27 having the same width is formed on the band-shaped plate 7 constituting the secondary oak 2 by bending the plate 7 so as to face the recessed flat groove portion 26 of the flat plate 9. The guide gear wheels 24 and 25 are pivotally supported on the flat protrusion 27, and the guide gear wheels 20a to 20d are fixed so as to be located below the flat protrusion 27. It is pivoted on fork 1.

(Operations and Effects of the Invention) The present invention can be carried out as described above, and a flat plate constituting the load supporting surface of a load supporting fork that can move in and out is provided with a central part in the width direction. Since a recessed flat groove portion of an appropriate width is formed by bending the flat plate over the entire length in the direction of moving in and out, when the barlet is deformed so that the center of the bottom protrudes as explained above, However, the protruding bottom surface of the pallet fits into the recessed flat groove, increasing the stability of the pallet on the fork, making it possible to safely handle the load without causing the load to collapse as in the past. Not only is it possible to
The recessed flat grooves also function as reinforcing ribs, making the flat plate thinner than conventional ones, making it possible to reduce the weight and cost of the entire device, but the greatest effect of this invention is The following points apply.

That is, bearing side frames are respectively attached to the left and right bottom surfaces of the flat plate so as to sandwich the recessed flat groove portion therebetween;
This side frame pivotally supported rollers that fit into the pair of left and right guide rails attached to the secondary fork, so a recessed flat groove was formed to obtain the above effect, so that it could be used to support loads from the fixed fork. The height of the entire device up to the load supporting surface of the primary fork does not increase, improving stability when moving with loaded pallets.
In addition, the part of the device that enters the cargo storage compartment on the shelf side can be configured to have a low volume, thereby increasing the storage efficiency on the shelf side.

[Brief explanation of the drawing]

1 is a plan view, FIG. 2 is a side view, FIG. 3 is an enlarged longitudinal sectional front view, and FIG. 4 is a schematic side view of the fork egress/retraction drive means. 1...Fixed fork, 2...Secondary fork, 3...Primary fork for load support, 5
... Fixed fork side frame, 6 ... Guide rail, 6
a... Outer groove-shaped rail part, 7... Band-shaped plate,
8...Primary fork side frame, 9...Flat plate for configuring the load supporting surface, 10-12...Main roller, 13,
14... Subroller, 15, 17... Vertical axis roller for steady rest, 16... Primary fork support roller, 20a to 20d, 25, 26... Guide gear ring, 21 to 23... Chain, 26... Concave Inlet flat groove part, 27... Protruding flat part.

Claims (1)

[Scope of utility model registration request] In a running fork type load transfer device comprising a secondary fork that is supported so as to be movable in and out of a fixed fork, and a primary fork for load support that is supported so as to be movable in and out of the secondary fork. , a flat plate constituting the load supporting surface of the primary fork is formed with a recessed flat groove portion of an appropriate width at the center of the plate in the horizontal width direction, extending over the entire length in the direction of movement in and out of the primary fork by bending the plate; Bearing side frames are attached to the left and right bottom surfaces of the flat plate with this recessed flat groove in between, and rollers that fit into the pair of left and right guide rails attached to the secondary oak are mounted on these side frames. A running fork type load transfer device that is supported by a shaft.