JPH0729115Y2 - Mast support plate for forklift trucks - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a mast support plate for a forklift truck, and in particular, the positioning to a jig is easy and reliable during processing, and the processing operation is performed efficiently. The present invention relates to a mast support plate for a forklift truck that is capable of achieving high machining accuracy.

[Conventional technology]

The forklift truck has a mast for supporting a fork for loading and unloading and carrying a load,
Generally, the mast is pivotally supported about the front axle of the forklift truck. At this time, the lower part of the mast is
It is pivotally supported around the front axle of the forklift truck via a mast support device.

In FIG. 2, the lower portion of the mast 19 arranged on the front side of the vehicle body 18 of the forklift truck is pivotally supported around the front axle 17 via the mast support device 11, and the mast 19 is also supported. The middle part of the is pivotally supported at the tip of the telescopic rod 20 which is telescopically driven by the telescopic cylinder supported on the vehicle body 18, and the mast 19 moves around the front axle 17 along with the telescopic movement of the telescopic rod 20. It can be swung back and forth.

The mast support device 11 has one side edge fixed to the mast 19, and another side edge directed downward and rearward has a semi-cylindrical hole in the plate thickness direction, and the semi-cylindrical hole forms the semi-cylindrical bearing 13. Mast support plate 12 that fits through the front axle 17 of the front wheel 16 via
And a cap 14 fixed to the mast support plate 12 side with a bolt 15 with a front axle shaft 17 interposed between the mast support plate 12 and the semi-cylindrical hole.

FIG. 3 shows a conventional process for forming a semi-cylindrical hole n in the plate thickness direction on the mast support plate h used as the mast support plate 12 described above.

Positioning pins i, j, k are erected on the surface of the jig plate 1, and are pressed against these positioning pins i, j, k with the mast support plate h oriented in a predetermined direction. By positioning and lowering the cutter m while rotating, a semi-cylindrical hole n in the plate thickness direction for fitting with the front axle 17 is formed in the side edge portion of the mast support plate h.

[Problems to be solved by the device]

By the way, in the above-described conventional step of forming the semi-cylindrical hole in the mast support plate, since the positioning pins i and j are in contact with the side edge portions of the mast support plate h on the outside of their contours, two masts are formed. It is not possible to simultaneously form semi-cylindrical holes in the two mast support plates by aligning the side edges of the support plates with each other and forming a cylindrical hole in the joint.

Therefore, conventionally, each mast support plate h is pressed one by one against the positioning pins i, j, k for positioning, and a semi-cylindrical hole n is formed in each mast support plate h by a cutter m. . For this reason, not only the machining work for the mast support plate is inefficient, but also high machining accuracy for the semi-cylindrical hole cannot be expected.

In view of the above-mentioned circumstances, a main object of the present invention is to provide a mast support plate for a forklift truck capable of efficiently performing processing and obtaining high processing accuracy.

[Means for Solving the Problems]

According to the mast support plate for a forklift truck of the present invention, a mast support used in a mast support device for swingably pivoting a lower portion of the mast around a front axle of the forklift truck. The plate has a semi-cylindrical hole in the plate thickness direction that fits to the front axle at the outer peripheral edge portion, and the positioning pins on the jig during processing do not protrude from the contour of the outer peripheral edge portion. A mast support plate for a forklift truck, characterized in that it has at least one recess for engaging the positioning pin.

[Action]

In the mast support plate for a forklift truck of the present invention, a cutout recess that engages with the positioning pin is formed in advance before the semicylindrical hole that fits into the front axle is formed.

When the mast support plate is pressed against the positioning pin in forming the semi-cylindrical hole that fits in the front axle, at least one positioning pin engages in the notch recess of the mast support plate, and It does not project outward from the peripheral contour.

Therefore, by forming a notch recess in the preselected side edge of the mast support plate,
It is possible to align the side edges of the two mast support plates with each other. Then, by forming a cylindrical hole in the plate thickness direction having a center on the abutting portion of the two mast support plates, it is possible to simultaneously form semi-cylindrical holes at the side edge portions of each mast support plate. it can.

〔Example〕

Hereinafter, a mast support plate for a forklift truck according to an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, on the side edge portion side where the semi-cylindrical holes 1a, 2a of each mast support plate 1, 2 are to be bored, when the respective side edge portions are cut out in advance by gas cutting processing, the positioning pins are engaged respectively. Notch recesses 1b and 2b are formed for mating.

On the other hand, on the upper surface of the jig plate 9, the positioning pins 3, 4,
5,6,7,8 are erected, and a central hole 9a is formed at a position directly below the cutter 10. Each positioning pin
The 3, 7 and 9 and the positioning pins 6, 4 and 5 have an axially symmetrical arrangement relationship with respect to the center line of the cutter 10 and the center hole 9a.

The mast support plates 1 and 2 are oriented so as to be axially symmetrical with respect to the center line of the cutter 10 and the center hole 9a of the jig 9, and then the corresponding positioning pins 3, 7, 5 and 6, 4, When pressed against 8, the cutout recess 1b of the mast support plate 1 engages with the positioning pin 7, and the cutout recess 2b of the mast support plate 2 engages with the positioning pin 4.

Each notch recess 1b, 2b is a cutout so that when the corresponding positioning pin 7, 4 is engaged, each positioning pin 7, 4 does not project outward from the contour of the outer peripheral edge of each mast support plate 1, 2. Has a notch depth. Therefore, the mast support plates 1 and 2 are positioned in a state where the side edges where the semi-cylindrical holes 1a and 2a are to be formed are in close contact with each other.

When the pair of mast support plates 1 and 2 are positioned in contact with each other and then the cutter 10 is processed while being rotated, between the pair of mast support plates 1 and 2,
Cylindrical holes in the plate thickness direction having a center are formed on the side edges that are in contact with each other, and as a result, the semi-cylindrical holes 1a in the plate thickness direction are formed on the side edges of the mast support plates 1 and 2, respectively. 2a
Are formed at the same time. At this time, each of the semi-cylindrical holes 1a and 2a is processed in the manner of boring a cylinder, and thus is processed with high accuracy.

[Effect of device]

As described above, according to the mast support plate for a forklift truck of the present invention, the following effects and advantages can be obtained.

(1) Since at least one notch recess is provided in the outer peripheral edge, positioning can be performed easily and reliably by engaging the notch recess with the pin on the jig during processing.

(2) Since the notch recess has a notch depth that engages with the positioning pin so that the positioning pin does not protrude from the contour of the outer peripheral edge of the mast support plate during processing, By forming a notch recess in the side edge selected in advance, a cylindrical hole is bored with the side edges of the pair of mast support plates abutting each other, and at the same time with respect to the pair of mast support plates. By forming the semi-cylindrical hole for fitting to the axle, the working operation can be efficiently performed, and the semi-cylindrical hole can be processed with high accuracy.

[Brief description of drawings]

FIG. 1 is a perspective view showing a processed state of a mast support plate for a forklift truck according to an embodiment of the present invention, FIG. 2 is a side view of a part of a conventional forklift truck in a perspective view, and FIG. 3 is a conventional forklift truck. It is a perspective view which shows the processing state of the mast support plate for trucks. 1,2 …… Mast support plate, 1a, 2a …… Semi-cylindrical hole,
1b, 2b …… Notch recess, 3,4,5,6,7,8 …… Positioning pin,
9: jig plate, 9a: center hole, 10: cutter, 11
…… Mast support device, 12 …… Mast support plate, 13 …… Semi-cylindrical bearing, 14 …… Cap, 15 …… Bolt, 16 …… Front wheel, 17 …… Front axle, 18 …… Body, 19 …… Mast , 20 ... Telescopic rod, h ... Mast support plate, i, j, k ... Positioning pin, l ... Jig plate, m
…… Cutter, n …… Semi-cylindrical hole.

Claims (1)

[Scope of utility model registration request] 1. A mast support plate used in a mast support device for pivotally supporting a lower portion of a mast around a front axle of a forklift truck, the outer peripheral edge portion of which is fitted to the front axle. It has a semi-cylindrical hole in the plate thickness direction to match, and at least one notch that engages with the positioning pin so that the positioning pin on the jig does not protrude from the outline of the outer peripheral edge during machining. Mast support plate for forklift trucks, which has a recess.