JPS6213131Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dump control lever device for controlling the elevation and descent of a dump vessel of a dump truck.

In a dump truck, a dump control lever can be fixed at a raised position and a lowered position in order to prevent the dump vehicle from being inadvertently raised or lowered due to erroneous operation or the like. As means for fixing the dump control lever in this way, the lever is guided and held in a stepped guide groove, or the dump control lever is fixed in a predetermined position using a lock plate, a lock lever, etc. be.

However, when the guide groove of the dump control lever is formed in a stepped manner as in the former case, it is necessary to operate the lever in the engagement/disengagement direction and then in the up/down direction even during normal control, so the lever operation is difficult. At the same time, there was an inconvenience that it was not possible to prevent erroneous operation of the lever.

Further, when the lock plate or the lock lever is provided independently as in the latter case, there is an advantage that the control lever can be operated easily when releasing the lock, and the reliability of fixation at a predetermined position is increased.
However, conventional lock plates or lock levers are installed so that they can reciprocate only in one specific direction, such as simply turning to engage and disengage, or sliding to engage and disengage. There was a risk that the lock plate and lock lever located in the lock mechanism would move relatively easily to the release position, which caused problems with the safety of the lock mechanism.

This invention was made in view of the above, and
One end of the guide groove that guides the lock lever that engages and disengages the dump control lever is bent downward at a substantially right angle to form a lock groove, so that the lock lever that engages and disengages the dump control lever is dropped into the lock groove and rotated. By engaging and holding this at a fixed position, the stability of the lock lever against running vibrations and external forces is improved, and the reliability of the locking mechanism of the dump control lever is improved. The object of the present invention is to reliably prevent the vessel from rising during driving, to have a simple structure with a small number of parts, to be implemented at low cost, and to enable easy visual confirmation of whether the vehicle is locked or not.

The present invention will be described in detail below based on an illustrated embodiment.

A bracket 3 is tightened and fixed with bolts and nuts 4 to the lower surface of a cross member 2 that supports an instrument panel 1 located in front of a driver's seat (not shown), and a lower end of a dump control lever 5 that controls the elevation of a dump vessel (not shown) is attached. is pivotally connected to the bracket 3 so as to be swingable back and forth.

Further, the base end of an arm 8 is welded and fixed to the base end boss portion 7 of the dump control lever 5 which is pivotally supported on a swing shaft 6 fixed to the bracket 3.
By connecting the clevis 10, which is pivoted to the tip of the lever with a pin 9, and a dump control valve (not shown) via a control cable 11, a link, etc., the control lever 5 can be moved forward from the neutral position shown by the solid line in FIG. If you tilt it back and swing it to the position shown by the dashed-dotted line, the dump control valve will switch to the down position, and conversely, if you tilt it backwards and swing it to the position shown by the two-dot chain line, the dump control valve will shift to the up position. The Dump Bethel can now be lifted. In addition, at least when lifting the dump vessel, use the PTO switch or PTO switch (not shown).
There is no need to explain in detail that it is necessary to operate the control lever to drive the hydraulic pump.

The left side surface of the bracket 3 is provided with the pivot shaft 6.
A guide plate 14 is formed by stamping a guide groove 12 parallel to the bolt and a lock groove 13 extending downward from the right end of the guide groove 12 at a substantially right angle.
A lock lever 16 parallel to the pivot shaft 6 is inserted and held in the bracket 3 so as to be slidable and rotatable, and an operating portion 17 of the lever 16 protrudes forward from the guide groove 12, so that the lock lever 16 can be slidably operated using the guide groove 12 as a guide, and can be rotated using the lock groove 13 as a guide.

On the other hand, a lock hole 18 is formed in the vicinity of the base of the arm 8 so as to coincide with the center of the lock lever 16 when the control lever 5 is operated to the raised position. Further, the length of the guide groove 12 is formed to such a length that when the lock lever 16 is pulled out, its tip can be moved to a position where it does not interfere with the arm 8, and the front end surface of the arm 8 and the lock hole 18 are connected to each other. The spacing is set to a size such that when the arm 8 is swung to the lowered position, the lock lever 16 comes into contact with the front end surface of the arm 8, thereby engaging and fixing the arm 8 in that position. The size of the lock hole 18 is formed to fit the lock lever 16.
When the lock lever 16 is inserted into the dump control lever 5, the dump control lever 5 is fixed in the raised position via the arm 8. 19 is lock lever 1
6 is a bush for slidably and rotatably attached to the bracket 3; 20 is a spacer for maintaining the distance between the left and right brackets 3; and the knob 2 attached to the tip of the dump control lever 5.
1 indicates the operating direction of the lever 5.

In the above configuration, during normal driving, the dump control lever 5 is operated to the lowered position, the lock lever 16 is slid to the right end in the figure, and the dump control lever 5 is engaged and fixed in the lowered position via the arm 8. At the same time, the lock lever 16 is lowered into the lock groove 13 extending downward and engaged, thereby locking the lock lever 16 in the fixed position.

That is, if the lock lever 16 is simply slid (extended and retracted), there is a risk that the lock lever 16 will move from the fixed position to the released position due to running vibration or a slight external force. When the lock lever 16 is inserted into the lock groove 13 and engaged, the lock lever 16 is stably locked in the fixed position even when vibrations and external forces are applied. Therefore, there is no risk that the dump control lever 5 will be unlocked while driving.
Accidents due to incorrect operation are prevented.

When lifting and rotating the dump vessel, the lock lever 16 that has fallen into the lock groove 13 is lifted and then moved within the guide groove 12 to the release position. Then, the tip of the lock lever 16 is pulled out to a position where it does not interfere with the arm 8, so that the dump control lever 5 is released from being fixed.

When lifting and rotating the dump vessel for various maintenance inspections, keep the dump control lever 5 in the raised position and slide the lock lever 16 to the right in the figure to lock the lock hole 18 in the arm 8. Insert the lock lever 16 into the Then, the dump control lever 5 is fixed in the raised position via the arm 8. In this case as well, safety can be improved by lowering the lock lever 16 into the lock groove 13 and engaging it.

That is, since the lock groove 13 is formed downward, it will not come off due to vibrations, etc., and a spring or the like is not required. In addition, in the embodiment, one end of the guide groove 12,
That is, although the locking groove 13 is formed in connection with only the fixed end, a locking groove is also formed in connection with the releasing end so that the lock lever 16 can be locked in either the fixed or released position. Also good. Moreover, the arm 8 not only functions as a locking mechanism, but also
It also has a function of connecting the dump control lever 5 and the control cable 11 for controlling the elevation of the dump vessel, and the control lever 5, guide plate 14, lock lever 16, etc. are mounted on the bracket 3 in one place.
Since positional deviation can be prevented only by machining the lock groove 13, the number of parts can be reduced as much as possible and implementation can be carried out at low cost, and the presence or absence of locking by the lock lever 16 can be easily confirmed visually.

As explained above, according to the present invention, the lock lever that releasably fixes the dump control lever can be engaged by falling in a direction perpendicular to the direction of engagement, thereby locking the lever itself in the fixed position. Therefore, the lock lever in the fixed position does not easily move to the release position due to running vibrations and external forces, improving the reliability of the locking mechanism of the dump control lever, and preventing accidents such as the vehicle falling due to incorrect operation. can.
In addition, since the dump control lever is attached to the instrument panel, the driver's cab has more legroom than one that is attached to the floor, improving comfort and improving the operability of the dump control lever and lock lever. will improve. In addition, the number of parts can be kept to a minimum so that it can be implemented at low cost, and the presence or absence of the dump control lever lock can be easily confirmed visually.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
The figure is a front view of the instrument panel, Figure 2 is a front view of the dump control lever installation part, Figure 3 is a front view of the main parts, Figure 4 is a side view of Figure 3, and Figure 5 is the guide. It is a perspective view of a plate. DESCRIPTION OF SYMBOLS 1... Instrument panel, 2... Cross member, 3... Bracket, 5... Dump control lever, 6... Rocking shaft, 7... Boss part, 8
... Arm, 12 ... Guide groove, 13 ... Lock groove, 14 ... Guide plate, 16 ... Lock lever, 17 ... Operation section, 18 ... Lock hole, 19
...Butsuyu, 21...Nobu.

Claims (1)

[Scope of utility model registration request] A dump control lever is pivotally attached to a bracket fixed to the instrument panel in front of the driver's seat so as to be able to swing back and forth, and the dump control lever is fixed to the base end of the dump control lever to control the elevation and descent of the dump vessel. An arm to which a control cable for control operation is connected is attached to the bracket so as to be slidable substantially parallel to the swing axis of the dump control lever and to be rotatable around the axis, and is configured to control the raising and lowering positions of the control lever. a lock lever that releasably fixes the arm at each position, a guide groove that is substantially parallel to the swing axis of the dump control lever, and a lock groove that bends downward at a substantially right angle from one end of the guide groove. and a guide plate fixed to the bracket, and the lock lever is slidably guided and held in the guide groove, so that the lock lever at the fixed position of the dump control lever is dropped into the lock groove and engaged. A dump control lever device for a dump truck, characterized by: