JPS641172Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a locking device for a tail-type steering wheel in an industrial vehicle such as a forklift or a shovel loader.

[Conventional technology]

7 and 8 show conventional locking devices. This locking device is provided in a shaft hole 32a of a support member 32 fixed to the upper part of the rear surface of the front protector 6, and in a guide plate 37 fixed to the steering post 2 via a clamp member 20. A stepped bolt 3 is inserted into one of the plurality of continuously formed locking holes 37b.
9 is inserted through the bolt 39, and the knob 40 attached to one end of the bolt 39 is pulled to the outside of the support member 32 against the biasing force of the spring 41, and the large diameter portion 39a of the stepped bolt 39 is inserted into the locking hole 37b. After the small diameter portion 39b is moved to that position, the steering column 2, which is supported by the lower end of the front protector 6 so as to be tiltable back and forth, is moved in the front and back direction to pass through the groove 37a and open another locking hole 37b. is designated as the small diameter portion 39b, and then the knob 40
By releasing the large-diameter portion 39a and locking the large diameter portion 39a in the locking hole 37b, the steering post 2 locks both locking holes 3 formed in the guide plate 37.
The inclination angle can be adjusted depending on the drilling position of 7b.

[The problem that the idea aims to solve]

Therefore, it is necessary to set the position of the locking hole 37b of the guide plate 37 so that its center is located on an arcuate line concentric with the tilting center of the steering post 2. Machining errors in the guide plate 37 and support member 32 and assembly errors in the tilting center position of the steering post 2 will impede smooth tilt angle adjustment, so these machining and assembly require considerable precision. There was a problem that it was requested.

Also, after tilting the steering post 2, the knob 4
Even if 0 is released, the large diameter portion 39a of the stepped bolt 39
and the locking hole 37b do not necessarily match exactly, and it is troublesome to align the two while slightly moving the steering post 2 back and forth each time.

The technical problem to be solved by the present invention is to make it possible to adjust the inclination of the handle post very quickly and reliably, and to simplify processing and assembly.

[Means to solve the problem]

In order to solve the above-mentioned problem, the device of the present invention has a box frame-shaped holding frame whose rear end is pivotably supported on a steering post so as to be able to rotate downwardly and at least the front side is open, and the holding frame has an eccentric arc surface portion. a cam member rotatably supported at the lower portions of both side walls of the front protector; The control plate is provided with a regulation plate having a plurality of arcuate grooves arranged in parallel to fit together, and the regulation plate is configured to be pressed against the holding frame through rotational displacement of a cam member.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to FIGS. 1 to 6. In the figure, 2 is a steering post, and 3 is a gear box. The gear box 3 is rotatably connected to a lower bracket 7 fixed to the lower back of the front protector 6 by means of a pin 8, so that the steering post 2 can be tilted forward and backward. is supported by A column support 4 is arranged on the upper front side of the steering post 2, and the column support is attached to the steering post 2 by being fastened with a bolt 5 to a column clamp 9 fitted from the rear side of the steering post 2. ing. A connecting piece 4A is protruded from the front surface of the column support 4.
includes a connecting piece 10 protruding from a holding frame 10 which will be described later.
A is pivotably supported by a connecting pin 14 parallel to the pin 8, which is the center of tilting of the steering post 2, so that it can be depressed and rotated.

The box frame-shaped holding frame 10 is open on the front and bottom sides, the connecting piece 10A is provided protruding from the rear wall, and a bearing hole 1 is provided approximately at the center of the lower part of the opposite side walls.
0B is drilled. In the figure, reference numeral 11 denotes a semicylindrical cam member, which has a semicircular arc surface portion 11A, and its axial length is set so that it can be stored between both side walls of the holding frame 10. Then, the cam member 11 as a lever is inserted between both side walls of the holding frame 10, and the square shaft 13, to which the handle 12 is fixed at one end, is inserted into the square hole 11C of the cam member 11, and both ends of the shaft are inserted into the bearing hole 10B.
By supporting the cam member 11 with the holding frame 1
It is rotatably attached to the holding frame 10 with a required space between it and the inner surface of the upper wall of the holding frame 10. The cam member 11 is a so-called eccentric cam whose center of rotation is shifted downward in FIG. 4 from the center of curvature of the arcuate surface portion 11A, and the flat portion 11B provided opposite the arcuate portion 11A is omitted. It is also possible to use an eccentric cam with a simple circular cross section, but the flat part 11B
This formation is convenient for smoothing the relative movement with the regulation plate 16, which will be described later.

On the other hand, a shaft hole 15A parallel to the connecting pin 14 is bored in the upper bracket 15 fixed to the upper rear surface of the front protector 6.
The regulating plate 16 is pivotally supported by a connecting pin 17 inserted through A so that it can be tilted and rotated. The regulation plate 16 has a width that allows it to be inserted between both side walls of the holding frame 10, and a length equivalent to the holding frame 10, and a bottom surface of the regulation plate 16 is provided to maintain the tilted position of the steering post 2. A plurality of arcuate grooves 16A are arranged in parallel with the connecting pin 17, and the radius of curvature of the arcuate grooves 16A is set to be somewhat larger than that of the arcuate surface portion 11A formed on the cam member 11. . As shown in FIG. 4, the height of the regulation plate 16 is determined by the rotation of the cam member 11 fitted in the arcuate groove 16A, when the regulation plate 16, which serves as a driven joint, is displaced and floated to the almost maximum level. The upper surface is adjusted to be pressed against the inner surface of the upper wall of the holding frame 10. Connecting pin 1 like this
A regulating plate 16, one end of which is pivotally supported by the upper bracket 15 via a shaft 7, extends into the holding frame 10 and is supported by the cam member 11 (see FIGS. 3 and 4). .

Since the locking device of this embodiment is constructed as described above, the attachment bracket 1 is
5 and column support 4 or holding frame 1
Even if some dimensional error occurs in the front-rear direction or vertical direction between the column clamp 9 and the regulating plate 16, this error can be corrected by moving the mounting position of the column clamp 9 up and down to connect the holding member 10 and the regulating plate 16 together. This can be absorbed by rotating the pins 14 and 17 in the vertical direction as fulcrums, or by moving the mated members 10 and 16 relative to each other in the front-back direction to change the mating depth. It is possible. Therefore, the assembly work can be carried out without difficulty regardless of the presence or absence of dimensional errors.

In addition, in order to adjust the tilting of the steering post 2, first rotate the cam member 11 using the handle 12, and align the arc surface portion 11A with the groove of the regulation plate 16.
6A and supports the bottom surface of the regulation plate 16 by the flat part 11B, the regulation plate 1
6 is displaced downward using the connecting pin 17 as a fulcrum, and a gap α is created between its upper surface and the inner surface of the upper wall of the holding frame 10 (the state shown in FIGS. 5 and 6). Therefore, the pressure bond between the regulating plate 16 and the holding frame 10 is released, allowing free relative movement of both members 10 and 16.

When the steering post 2 is tilted in a desired direction around the connecting pin 8, which is the tilting fulcrum, from this state, the cam member 11, which moves together with the holding frame 10, places the bottom surface of the regulation plate 16 on its flat surface 11B. When the handle 12 is operated again to rotate the cam member 11 at the adjustment position where the cam member 11 is substantially aligned with the other arcuate groove 16a, the arc surface portion 11A is newly fitted. Arc groove 16A
The regulation plate 16 is floated again through the holder frame 10, and the regulation plate 16 is once again crimped onto the holding frame 10, thereby completing the locking of both members 10 and 16, that is, the tilt adjustment of the steering post 2 (the third , condition shown in Figure 4).

Note that when the holding frame 10 and the regulation plate 16 are pressed together by the cam member 11, the arcuate part 11A of the cam member 11 is fitted between the arcuate part 11A and the arcuate groove 16A, so that the arcuate part 11A is attached to the front and back of the regulation plate 16. It also serves as a stopper for directional movement.
Relative slippage between the two members 10 and 16 can be effectively prevented, and a reliable locking effect can be obtained.

[Effect of idea]

In this way, the locking device of the present invention has the holding frame 10.
Since both the and regulation plate 16 are vertically rotatable to absorb dimensional errors, it is possible to align the arcuate center of the elongated hole of the guide plate 37 with the tilting center 8 of the steering post, as in the conventional device. Restrictions on accuracy due to machining and assembly are eliminated, and as a result, machining and assembly can be simplified. Moreover, locking and releasing operations between the holding frame 10 and the regulation plate 16 during tilt adjustment can be easily performed by only rotating the cam member 11, and quick and smooth tilt adjustment can be expected.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway sectional view showing an embodiment of the present invention, Fig. 2 is an exploded perspective view of the locking device portion of Fig.
4 is a sectional view taken along line A-A in FIG. 3, and FIG. 5 is a sectional view taken along line C-C in FIG. 1 when the steering post 2 is tilted. , FIG. 6 is a sectional view taken along line B-B in FIG. 5, and FIG.
The figure is a partially cutaway side view of a conventional locking device, and FIG. 8 is a sectional view taken along the line D--D in FIG. 7. 2... Steering post, 4... Column support, 9... Column clamp, 10... Holding frame,
11... Cam member, 11A... Arc surface portion, 11B...
... Flat part, 12 ... Handle, 15 ... Atsushi bracket, 16 ... Regulation plate, 16A ... Arc-shaped groove, 8, 14, 17 ... Connection pin.

Claims (1)

[Scope of utility model registration request] A box-shaped holding frame whose rear end is pivotally supported to the steering post so that it can be depressed and rotated downwardly, and at least the front side is open; A supported cam member, a front end of which is pivotally supported on the back surface of the front protector so as to be tiltable and rotatable, extends into the holding frame, and has a plurality of arcuate grooves arranged in parallel on the bottom surface to fit with the cam member. 1. A locking device for a tail-type steering handle for an industrial vehicle, characterized in that the regulating plate is configured to be pressed against the holding frame through rotational displacement of a cam member.