JPH0311095Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a tail-type steering device for an industrial vehicle such as a forklift or a shovel loader, and more particularly to a locking device for fixing a steering handle in a predetermined position.

Prior Art FIGS. 1 and 2 show a conventional tail-type steering device. As shown in the figure, a steering post 3 that rotatably supports a steering shaft 2 having a steering handle 1 at its upper end has a front protector 4 at its lower part.
It is supported on the lower side via a bracket 5 so as to be tiltable forward and backward, and is provided with a tail box 6 on the upper side. A support rod 7 is protruded from the upper side of the front protector 4 toward the inside of the tail box 6, and the support rod 7 has a split metal 8 with one side thereof attached to the inner surface of one side plate 6a of the tail box 6. They are slidably fitted in an abutting state. Then, in the screw hole formed in one piece 8a of the split metal 8, there is an adjustment bolt 1 with a locking hole 9.
0 is screwed through the elongated hole 11 of the side plate 6a of the tail box 6 and the through hole 12 of the other piece 8b of the split metal 8, and by tightening the split metal 8 with the adjusting bolt 10, the support rod 7 It is now fixed to Reference numeral 13 designates a washer that is fastened to the free end of the support rod 7 via a nut 14 to prevent it from coming off.

That is, the conventional device shown in the figure is a system in which the split metal 8 is tightened to the support rod 7 by the adjuster bolt 10, and the steering post 3 is fixed by pressing it against the inner surface of the tail box 6, so to speak, it utilizes frictional force. Since it is fixed using a fixed method, strong tightening is required, and it is difficult to secure frictional force due to machining errors in the hole diameter of the split metal 8. Moreover, if the split metal 8 is loosened, the split metal 8 will not touch the support rod. 7
Since the steering post 3 is in a free state relative to the steering wheel, there is a drawback that the steering post 3 moves significantly rearward, making it difficult to adjust its angle.

OBJECT OF THE INVENTION An object of the present invention is to provide a locking device for a tail-type steering device for an industrial vehicle that is improved so as to eliminate the drawbacks of the conventional device described above.

Structure of the invention The present invention is a tail-type steering device for an industrial vehicle, which includes a tail box provided on the upper side of a steering post, and a tail box provided on the upper side of the front protector so as to extend rearward into the tail box. A support rod that protrudes and has a plurality of lock grooves at appropriate intervals in the axial direction on its outer periphery; A split metal placed so as to come into contact with the inner surface,
a ring spring that is fitted with an inward biasing force into a ring groove formed on the inner periphery of the split metal and that is removable from a lock groove of a support rod;
a lock adjustment bolt attached to the split metal through the side plate of the tail box;
It is slidably attached to the split metal so that it can come into contact with the outer surface of the ring spring and the inner surface of the tail box, and presses the ring spring toward the support rod when tightening the split metal with an adjustment bolt. The push pin and the locking device constitute a locking device that can reliably fix the steering post at a predetermined adjustment position.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on FIGS. 3 to 6. However, the same reference numerals are given to the same members as in the conventional case, and the explanation thereof will be omitted.
Support rod 7 that slidably supports split metal 8
An appropriate number (four in this embodiment) of lock grooves 15 are formed at appropriate intervals in the axial direction on the outer periphery of the lock groove.

On the other hand, as shown in FIG.
A ring spring 17, which can be freely engaged and detached, is fitted in with an inward biasing force applied thereto. Since the steering post 3 is generally allowed to move to some extent in the left and right direction, the lock groove 15 of the support rod 7 is designed so that its depth (engaging depth) H falls within the allowable range of movement. is set to . The depth of the ring groove 16 of the split metal 8 is set so that the ring spring 17 can escape from the lock groove 15 of the support rod 7.

In addition, as shown in FIGS. 5 and 6, the other piece 8b of the split metal 8 is provided with a small hole 19 extending from one side toward the center of the metal hole.
A push pin 18 is slidably inserted into the interior of the push pin 9 . One end of the push pin 18 can come into contact with the outer periphery of the ring spring 17, and the other end can come into contact with the inner surface of the side plate 6a of the tail box 6.

This embodiment is configured as described above,
The effect will be explained below. In the illustrated locked state, when the adjusting bolt 10 for locking is loosened to release the tightening of the split metal 8 in order to adjust the inclination angle of the steering post 3, both pieces 8a and 8b of the split metal 8 are released. The lower side, ie, the slit S side, is expanded outward by the elastic force. Therefore, the side plate 6a of the tail box 6 is pushed by this expansion operation, and the upper side of the contact surface between the side plate 6a and the other piece 8b of the split metal 8, that is, the vicinity of the push pin 18, as shown in FIG. A gap C is created as shown by the imaginary line. This gap C
As mentioned above, this occurs within the range of movement allowed for the steering post 3, and is the same as or slightly larger than the depth H of the lock groove 15 of the support rod 7.

Therefore, if the steering post 3 is tilted in such a state, the ring spring 17 will be forcibly expanded and pulled out from the lock groove 15 of the support rod 7 when the split metal 8 moves, and the push pin 18 will be pulled out from the lock groove 15 of the support rod 7. to move. In this state, the ring spring 17 is moved along the outer peripheral surface of the support rod 7, and when it comes into contact with the lock groove 15 at the next position, it is fitted into the lock groove 15 by its own elastic force.

Therefore, by performing such operations,
After adjusting the inclination angle of the steering post 3 appropriately, tighten the split metal 8 with the adjuster bolt 10.
When tightened, the side plate 6a of the tail box 6 and the other piece 8b of the split metal 8 come into contact with each other, so the push pin 18 is pushed by the side plate 6a and the ring spring 17 is directed toward the lock groove. Press it. That is, ring spring 1
7 is restricted from expanding, the steering post 3 is reliably fixed at the adjusted position.

In this embodiment, the steering post is supported by the front protector, but it may be supported by the frame.

Effects of the invention As stated above, the present invention is a tail-type steering device that relies not only on the frictional force of the split metal but also on the locking system using a ring spring, thereby improving the system that relies only on the conventional frictional force. Compared to the above, it can be securely fixed to the steering post at the adjusted position without the need for particularly strong frictional force, and the steering post will not tilt significantly backwards when adjusting the tilt angle. The adjustment operation is extremely simple, and it is a practically useful device as a locking device for a steering wheel.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway side view of a conventional device;
The figure is a sectional view taken along the line -- in FIG. 1, FIGS. 3 to 6 show embodiments of the present invention, FIG. 3 is a partially cutaway side view, and FIG. 4 is a partially cutaway front view of the locking device.
5 is a cross-sectional view taken along the line -- in FIG. 3, and FIG. 6 is a cross-sectional view taken along the line -- in FIG. 1... Steering handle, 3... Steering post, 6... Tail box, 7... Support rod, 8... Split metal, 10... Adjustment bolt, 15... Lock groove, 16... Ring groove, 17...Ring spring, 18...Push pin.

Claims (1)

[Scope of utility model registration request] In a tail type steering device in which the lower side of the steering post is supported on a front protector or the frame of the vehicle body so as to be tiltable forward and backward, there is a tail box provided on the upper side of the steering post, and a front side that extends into the tail box. A support rod that protrudes rearward from the upper part of the protector and has a plurality of lock grooves at appropriate intervals in the axial direction on its outer periphery; a split metal disposed such that a side surface abuts one inner surface of the tail box; and a ring groove formed on the inner periphery of the split metal is fitted with an inward biasing force, and A ring spring that can be engaged and detached from the lock groove of the support rod, an adjustment bolt for the lock that is attached to the split metal through the side plate of the tail box, and the outer surface of the ring spring and the inner surface of the tail box come into contact with each other. A tail for an industrial vehicle characterized by comprising: a push pin which is slidably attached to a split metal so as to obtain a push pin and which presses a ring spring toward a support rod when the split metal is tightened by an adjusting bolt. Locking device for type steering system.