JPH0221518Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lumber fork for a log loader.

A log loader is a loader that is used for loading and unloading logs and other wood by attaching a fork instead of the bucket normally attached to a wheel loader.The types of fork include log fork, dumping fork, dumping fork,
There are lumber forks, etc., but the tine spacing of lumber forks can be adjusted to suit the material being handled.

The lumber fork of the present invention is referred to as a sliding fork, and the conventional one has an upper frame 14 and a lower frame 12 arranged vertically on the left and right inside of the guide frame 15 of the carriage 1, respectively, as shown in FIGS. 1 and 2. The tines 2~ are brought into contact with the plates 13, 11 on the front surfaces of the upper and lower frames 14, 12, and the upper hooks 22 of the tines 2~ are engaged with the plate 13, and the lower hooks 21 are engaged with the plate 11. , the plates 13 and 11 serve as rails, and the pair of tines 2~ can slide in the lateral direction to adjust the distance between them. Tines 2~ are connected to the upper hook 2 from the notches 13a and 11a.
2. After inserting the lower hook 21, slide it laterally as described above. Grooves 13b are bored at predetermined intervals on the upper side of the plate 13, into which pins 23 for fixing the lateral movement of the tines 2~ are fitted.
The pin 23 passes through the upper hook 22 of the groove 1.
3b. A pair of hinge plates 19 are fixed vertically between the upper frame 14 and the lower frame 12, and are removably connected by a pin at the tip of a lift arm (not shown) of the loader.

In the conventional sliding fork having the above structure, a load is normally applied in the ^A3 direction and transmitted in the ^A1 to ^A2 directions. The load of A ¹ and A ² is transferred to the upper hook 2.
2. Since it is supported by one piece, the upper hook 22 often wears out and breaks early.

In addition, the load in the ^A1 direction is supported by the area of the width of the upper hook 22 (tine width) x the thickness of the plate 13, and the contact pressure on the contact surface tends to increase. The area becomes smaller and the surface pressure becomes even higher. In order to reduce this surface pressure and suppress wear, there are methods of increasing the thickness of the plate 13 or increasing the width (tine width) of the upper hook 22, but both of these methods increase weight and are not practical for reasons such as increased costs. It's difficult.

In addition, the plates 11 and 13 serve as rails for the sliding of the tines 2~, and the lower hook 21 and the upper hook 22 on the tine 2~ side take charge of the lateral movement while remaining engaged. , as shown in Fig. 4, there is a large difference between the hook width W ² and the vertical distance W ¹ of the rail, so depending on the amount of gap l in the engaging part and the position where force F is applied, a chucking phenomenon can occur as shown in Fig. 4. Easy to do. Furthermore, this phenomenon also occurs due to vibrations during cargo handling, which accelerates wear and deformation of the engaging portion, and is a major cause of deterioration of durability.

In addition, a guide frame (protector) is provided on the fork in order to protect the product by preventing load collapse and spillage, and to prevent danger to the operator due to load spillage from the fork raised position. The guide frame 15 is as shown in FIG.
It is reinforced with plates 16, 17, pipes 18, etc., but important attachments that receive loads from materials, tines, etc. during cargo handling operations are the upper frame 14 (including plate 13) and the lower frame 12 (including plate 11). ) is restricted only to guide frames 15 (one on each side) that are fixed at both ends. In addition, the reason why it is not possible to generate a corresponding rigid force even though multiple members such as the plates 16, 17 and the pipe 18 are used is that the plate 13 on the front surface of the upper frame 14 can be freely slid from above using the upper engaging portion 22 of the tines 2~. This is to allow the tines 2 to be slid across the entire width of the upper frame 14, and this is unavoidable for a fork with this structure.

This idea was made in view of the above-mentioned circumstances.The upper frame is formed into a square shape, the upper ends of the tines are engaged from below, and a central triangular stopper is provided in the middle of the tines to abut against the upper surface of the lower frame. The present invention aims to provide a slide-type fork that solves the problems of the conventional fork by having the lower frame and the lower hook basically configured in the same manner as the conventional fork.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 5 is a perspective view of a sliding fork showing an embodiment of the present invention, and FIG. 6 is a view showing the tine attachment part of the same sliding fork. Upper engaging portion 22 of ~
is fitted into the U-shaped groove 14b of the upper frame 14, and the lower surface of the middle triangular stopper 24 protruding between the tines 2 and 2 is in contact with the upper surface of the lower frame 12, and the lower frame 12 and the lower hook 21 have a conventional fork and basic shape. The lower hook 21 grips the plate 11 from below. The pair of tines 2~ connect the lower surface of the middle triangular stopper 24 to the lower frame 12.
After inserting the upper engaging part 22 and the lower hook 21 through the notches 13a and 11a while making contact with the upper surface, insert the upper engaging part 22 and the lower hook 21 into the upper frame 14 and the lower frame 12 while keeping the upper engaging part 22 and the lower hook 21 fitted together. to move laterally. At the position where the distance between the pair of tines 2 is the specified width, insert the pin 23 into the upper frame 1.
4 through the pin hole 14a of the tine 2 to the head protrusion piece 2.
The tines 2~ are fixed by fitting into the pin holes 25a of No.5. A pair of hinge plates 19 are fixed vertically between the upper frame 14 and the lower frame 12,
It is removably connected to the lift arm (not shown) of the loader by a pin at the tip.

Therefore, with the above-described configuration, the load applied to the tips of the tines 2 to 2 in the A ³ direction is transferred by the middle triangular stopper 24 to the A ¹ direction, and by the upper engagement portion 22 to the A ² direction.
Since the parts are dispersed in each direction, the durability of each part is improved, and the vertical distance (W ¹ in Fig. 4 in the conventional example) of the fitting part that serves as a guide when moving the tines 2~ in the lateral direction can be reduced.
Since the W ² is small, smooth sliding adjustment of the tines can be expected, and the upper engaging part 2 of the tines 2 ~
The upper frame 14, which supports the load in the ^A2 direction by engaging with the upper frame 14, is not only fixed to the guide frame 15 at both ends, but also connected to the guide frame 15 by the plate 17, so that the upper frame 14 has high rigidity. Become.

As explained in detail above, the sliding fork of this invention improves the durability and rigidity of each part of the fork, and provides effects such as smooth sliding adjustment of the tines.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional sliding fork.
Fig. 2 is a diagram showing the tine attachment part of the sliding fork, Figs. 3 and 4 are explanatory diagrams showing the engaged state of the tines in the conventional sliding fork, and Fig. 5 is an embodiment of the present invention. FIG. 6 is a perspective view of a sliding fork showing the tine mounting portion of the sliding fork. 1~...Carriage, 11, 13, 17...Plate, 11a, 13a...Notch, 12...Lower frame, 14...Upper frame, 14a, 25
a...Pin hole, 14b...U-shaped groove, 15...Guide frame, 18...Pipe, 19...Hinge plate, 2~...Tine, 21...Lower hook, 2
2...Upper engaging portion, 23...Pin, 24...Middle triangular stopper, 25...Protrusion piece.

Claims (1)

[Scope of utility model registration request] In a lumber fork, the upper engaging part and lower hook of a pair of tines are inserted through notches provided in each plate of the upper and lower frames, the tines are slid and set at a predetermined interval, and fixed with pins, The upper frame has its upper surface connected and fixed to the guide frame by a plurality of plates, and has a plurality of pin holes penetrating vertically in the longitudinal direction, and a U on the lower side.
A groove is provided, and the upper engaging portion of each tine is connected to the U-shaped groove.
the middle triangular stopper of the pair of tines comes into contact with the upper surface of the lower frame, the lower hook grips the plate of the lower frame from below, and the pin hole of the upper frame is penetrated. A sliding fork characterized in that a pin is inserted from above into a pin hole provided in a projecting piece of an upper engaging portion of each tine.