JPH0524979Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a clevis, and more particularly to a clevis suitable for use as a slider of a toggle-type handboo rake in an industrial vehicle such as a forklift.

(Prior art) Generally, the handle of a toggle type handboo rake used in a forklift is formed into a cylindrical shape.
A clevis called a slider is inserted into this handle. This clevis is provided to adjust play that occurs in the brake operating system due to elongation of the brake wire, wear of connecting parts of components, etc. That is, as shown in FIG. 9, the clevis 21 is housed in a cylindrical handle 22, and its U-shaped open end is connected to a link plate 23 connected to a brake wire via a link pin 24. A nut 25 provided at the bent portion, which is the closed end of the U-shape, is connected to an adjusting screw shaft 26 inserted into the handle 22. When play occurs in the brake operating system, the adjusting screw shaft 26 is rotated and screwed into the nut 25 to raise the clevis 21 and adjust the play, thereby obtaining a regular braking force. . Incidentally, such a clevis is disclosed in, for example, Japanese Utility Model Application Publication No. 62-32862.

(Problem to be solved by the invention) By the way, the clevis 21 is generally formed by bending a plate into a U-shape, but in this case, it is necessary to prevent interference with the adjusting screw shaft 26 screwed into the nut 25. In order to avoid this, it is necessary to sufficiently widen the distance between the two opposing plate pieces. In other words, the inner dimension of the U-shape is made wider than the diameter of the adjustment screw shaft 26 for relief, and the distance between the open end portion, which is the connecting portion with the link plate 23, is narrowed. There is. However, in such a configuration, when the contact pressure with the link pin 24 is high, even if an attempt is made to increase the thickness of the clevis 21 in order to reduce the contact pressure, the thickness is limited by the inner dimensions of the handle 22. There is a problem that it cannot be made thicker.

In view of the above problems, the present invention aims to provide a clevis whose thickness can be increased without changing the outer dimensions.

(Means for Solving the Problems) The present invention for solving the above problems consists of extending both plate-shaped pieces of the clevis bent in a U-shape in parallel over the entire length, and , A screw hole for mounting an adjustment screw is formed in the bent portion of both plate-like pieces, and a female threaded part or a recessed part continuous with the screw hole is formed on the inside of both plate-like pieces, and the screw hole is connected to the screw hole. The gist is that a relief part is provided for the relief of the adjustment screw that is screwed in.

(Function) As mentioned above, the clevis of the present invention has a threaded portion or a recessed portion on the inner surface of both plate-like pieces for releasing the tip of the screw shaft when screwing the adjusting screw shaft, so that the clevis of the present invention The plate thickness can be set to the maximum between the outer dimension regulated by the handle and the inner dimension regulated by the thickness of the link plate, which increases the contact area with the link pin and increases its thickness. The surface pressure is reduced.

(Example 1) Hereinafter, Example 1 of the present invention will be specifically described based on FIGS. 1 to 5. First, the toggle type handbrake to which the clevis is used will be explained based on FIG. The toggle type handbrake is mounted on a support bracket 2 fixed to the front frame 1 of the vehicle body.
A hook 6 slides along a straight guide groove 3 formed in the support bracket 2, and a wire head 5 at the end of the brake wire 4 is hung thereon, and a pin 7 is attached to a point on the extension line of the guide groove 3 in the support bracket 2. The main body of the handle 8 is comprised of a handle 8 that is swingably mounted through the handle 8 and a link plate 9 that connects the middle part of the handle 8 to the hook 6. By tilting the brake from the release position (the forward tilted position shown by the two-dot chain line) to the brake application position (the standing position shown by the solid line) on the opposite side, which is slightly beyond the dead center,
The hook 6 is pulled toward the handle 8 and the brake wire 4 is pulled to apply the parking brake.

The adjusting means for absorbing the play generated in the brake operation system is an adjusting screw shaft 1 inserted into the handle 8 and installed so as to be rotatable in a fixed position.
0, and a U-shaped clevis 11 that is housed in the handle 8 and connects the adjustment screw shaft 10 and the link plate 9. Specifically, this clevis 11 is a folding part that is the closed end. The bent part is connected to the adjustment screw shaft 10, and the open end is connected to the link plate 9.
The play of the brake operation system is adjusted by rotating the adjusting screw shaft 10 and moving the clevis 11 in the vertical direction. In addition,
The link pin 12 is inserted into the vertical groove 1 formed in the handle 8.
3, allowing the clevis 11 to move relative to the handle 8 during play adjustment. In addition, 14 in the figure is a plate washer, 15
is a cotter pin to prevent it from coming out.

Next, details of the clevis 11 will be explained based on FIGS. 1 to 3.

As shown in the figure, the U-shaped clevis 11 is provided with a screw hole 16 for screwing in the screw at the bent portion, which is the closed end, and a pin hole 17 for connecting the link plate at the open end. It is equipped with The opposing plate pieces 11a, 11b of the clevis 11 extend in parallel over the entire length, and the outer dimensions of the plate pieces 11a, 11b are set within the inner width of the inner space of the handle 8. The inner dimensions are set to be equal to or slightly larger than the thickness of the link plate 9. That is, the thickness of both plate-like pieces 11a and 11b is maximized between the outer dimension, which is regulated by the inner wall spacing of the handle 8, and the inner dimension, which is regulated by the thickness of the link plate 9. It is set. Further, on the inner surfaces of both plate-shaped pieces 11a and 11b, a female threaded portion 18 that is continuous with the threaded hole 16 is provided.
is formed over a predetermined length, thereby forming a recess for dispensing the tip of the adjusting screw shaft 10.

The clevis 11 configured as described above prevents the adjustment screw shaft 10 from being screwed into the screw hole 16 when adjusting the play of the brake operation system.
This can be allowed by the female screw portions 18 of a and 11b, and as a result, the plate thickness of the clevis 11 can be made sufficiently thick, so the contact area of the plate pieces 11a and 11b with the link pin 12 is increased. This results in a reduction in surface pressure. Moreover, since the female threaded portion 18 provided on the inner surface of the plate-like pieces 11a and 11b also functions as a guide for the adjusting screw shaft 10, it is more effective in suppressing rattling than when using a conventional nut.

(Example 2) Next, Example 2 of the present invention will be described based on FIGS. 6 to 8. In this embodiment, a substantially boat-shaped recess 19 is formed by press molding on the inner surfaces of the opposing plate-like pieces 11a and 11b, and this recess 19 is formed continuously with the female thread 18. Note that the other configurations are the same as in the first embodiment, and therefore, in this embodiment, the thickness of the plate pieces 11a and 11b is increased and the link pin 12 and surface pressure can be reduced. In this embodiment, the recess 19 is formed continuously with the female thread 18, but it is also possible to eliminate the female thread 18 and form the recess 19 immediately after the screw hole 16. be.

(Effects of the invention) As detailed above, the clevis of the present invention has a relief part formed by a female thread or a recess on the inner surface of the opposing plate-like pieces, so that the wall thickness of the plate-like pieces can be controlled by the handle. This can be set sufficiently large between the outer dimension regulated by the link plate and the inner dimension regulated by the link plate, thereby increasing the contact area with the link pin at the connection part with the link plate and increasing the pressure can be reduced. Therefore, sufficient strength against abrasion is achieved, which is useful for extending its life.

[Brief explanation of the drawing]

1 to 8 show embodiments of the present invention.
The figure is a front view showing the clevis of Example 1, Figure 2 is a side view, Figure 3 is a plan view, Figure 4 is a sectional view of the clevis assembled to the handbrake, and Figure 5 is a toggle type hand. A vertical sectional view showing the entire brake; FIG. 6 is a front view showing the clevis of Example 2;
FIG. 7 is a side view, and FIG. 8 is a plan view. Further, FIG. 9 is a sectional view showing a conventional clevis assembled to a handbrake. 8...Handle, 9...Link plate, 10
... Adjustment screw shaft, 11 ... Clevis, 11a, 11
b... Plate piece, 12... Link pin, 16... Screw hole, 17... Pin hole, 18... Female threaded part, 19
...Concavity.

Claims (1)

[Scope of utility model registration request] Both plate-like pieces of the clevis bent into a U-shape extend in parallel over the entire length, and a screw hole for an adjustment screw shaft is formed in the bent part of the plate-like piece, Further, the clevis is provided with a female threaded part or a concave part continuous with the screw hole on the inside of both plate-like pieces, and a relief part for the adjustment screw shaft to be screwed into the screw hole.