JPH0524977Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an industrial vehicle such as a shovel loader to which an attachment can be attached, and particularly relates to an attachment pedal for operating the attachment.

[Prior Art] As shown in Fig. 5, an industrial vehicle such as a shovel loader 1 can be equipped with an attachment such as an earth hoger 2, and is operated by an attachment pedal. There is something like that. There are various attachment pedals according to the prior art, and a typical configuration thereof is shown in FIG. 6.

That is, the attachment pedal shown in FIG. 6 includes a pedal body 12 pivotally supported by a support bracket 11 on a machine frame 10, and a lever 13 extending downward from the pedal body 12 is connected to a spool 15 of a control valve 14. is connected via a connecting rod 16. Therefore, when the pedal body 12 is stepped on and tilted back and forth, the spool 15 of the control valve 14 moves, and as a result, the flow of hydraulic oil in the hydraulic circuit related to the attachment is appropriately controlled. Furthermore, in the case of an attachment such as an earth hoger, since the operation may be maintained constant during work, the control valve 14 for the attachment is generally provided with a detent (not shown). When the pedal body 12 is tilted most forward, a detent is engaged and the spool 15 is locked, making it possible to maintain a constant flow of hydraulic oil.

[Problems to be solved by the invention] In the conventional configuration as described above, even in normal work where the operation of the attachment is variably controlled, detents easily occur if the pedal body is depressed too much. The driver had to operate the pedals while being careful not to detent, which resulted in a problem of reduced work efficiency.

The purpose of this invention is to solve these problems.

[Means for solving the problem] The attachment pedal for a work vehicle according to this invention prevents the pedal body from tilting forward just before the detent is engaged, and at the same time prevents the pedal body from tilting further forward when a predetermined pedal force is applied. It is characterized in that a pedal stopper made of an elastic material is attached to the machine frame opposite to the lower surface of the front end of the pedal body so that it can be tilted.

[Function] In the attachment pedal of this invention having the above-described structure, if the pedal body is simply tilted forward, its movement will be inhibited by the pedal stopper, making it difficult to detent.

[Embodiments] Hereinafter, preferred embodiments of the attachment pedal for industrial vehicles according to this invention will be described in detail with reference to the drawings.

Note that the same or equivalent parts as in the conventional configuration will be described using the same reference numerals.

1 and 3 show an attachment pedal installed in an industrial vehicle to which an attachment can be attached. The pedal body 12 of the attachment pedal is attached to a bolt 17 on the machine frame 10.
It is pivotally supported by a support pin 18 between a pair of support brackets fixed at. Pedal body 1
2 is provided with a lever 13 extending downward from its central portion, and this lever 13 is connected to the connecting rod 20.
The control valve 14 is connected to the spool 15 of the control valve 14 in the hydraulic circuit related to the attachment. The connecting rod 20 includes a front rod 21, a rear rod 22, and these rods 2.
1 and 22, and by turning the turnbuckle 23, the overall length can be adjusted. The control valve 14 is provided with a detent so as to be locked when the pedal body 12 is tilted most forward.
This detent has a conventionally known configuration, not shown, but includes, for example, a detent ball built into the housing of the control valve 14 together with a compression spring, and a spool 15 that is cut so that the detent ball engages in the detent position. and an engaging groove on the surface of the holder.

A bracket 26 is fixed to the machine frame 25 in front of the pedal body 12, and a pedal stopper 27 made of an elastic material such as rubber is provided on the upper surface of the bracket 26 at a position facing the lower surface of the front end of the pedal body 12. is screwed on. The pedal body 12 comes into contact with the upper end of the pedal stopper 27 just before the detent is engaged, and in order to engage the detent, the pedal body 12 must be depressed enough to deflect the pedal stopper 27 (FIG. 2).

Also, after bending the pedal stopper 27 and placing the detent, when you release your foot from the pedal body 12,
Although the pedal body 12 tends to tilt backward due to the elastic return force of the pedal stopper 27, the pedal body 12
In order to prevent the connecting rod 20 from being pulled and the detent released when the pedal body 1 is tilted,
Preferably, the second lever 13 and the connecting rod 20 are connected with play. That is, the lever 13
The connecting rod 20 is connected by a joint pin 28, and a hole 29 at the tip of the connecting rod through which the joint pin 28 passes is an elongated hole.

The pedal force required to deflect the pedal stopper 27 is determined by the material of the pedal stopper 27, and the amount of depression of the pedal body from when it comes into contact with the pedal stopper 27 until it is detented is:
Adjustment can be made using the turnbuckle 23.

In this configuration, the operation of the attachment pedal according to the present invention will now be described.

When performing normal work that variably controls the operation of attachments, the pedal body 12
Step on it to tilt it back and forth, and move the spool 15 of the control valve 14 back and forth via the connecting rod 20. Thereby, the hydraulic pressure of the hydraulic circuit related to the attachment is appropriately controlled. During this operation, the pedal body 12 is tilted forward, and the pedal body 12
When the front end of the pedal comes into contact with the pedal stopper 27 (Fig. 1), the driver can touch the pedal stopper 27 by touch.
Since the pedal body 12 will not tilt any further forward unless a force sufficient to overcome the elastic force of the pedal stopper 27 is applied, there is no need to worry about detent.

Next, as shown in FIG. 2, when the pedal body 12 is pressed forward so strongly that the pedal stopper 27 bends, the pedal body 12 tilts further forward, and the spool 15 is pushed to the rear of the machine together with the connecting rod 20. Detent is applied. When the foot is removed from the pedal body 12, the pedal body 12 tilts backward due to the elastic return force of the pedal stopper 27, but since there is play between the connecting rod 20 and the lever 13, as shown in FIG. As such, the connecting rod 20 and the spool 15 remain locked, and the operation of the attachment remains constant. In order to release this locked state, it is sufficient to step on the pedal body 12 and tilt it backward.

It is preferable that the center of gravity of the pedal body 12 is placed on the rear side of the machine frame, since the pedal body 12 will quickly tilt rearward in conjunction with the return force of the pedal stopper 27.
Further, as shown in FIG. 4, the pedal body 12
A tension spring 31 may be interposed between the front end of the machine and the machine frame 30 above it.

[Effects of the invention] As described above, according to this invention, since the elastic pedal stopper is arranged at the bottom of the front end of the pedal body, the detent is difficult to enter, and there is no need to pay attention to the detent during normal work. ,
This has the effect of improving work efficiency and safety.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the attachment pedal of an industrial vehicle according to this invention, and is a schematic explanatory view showing just before entering the detent, Fig. 2 is an enlarged partial view showing the pedal stopper in a bent state, and Fig. 3 The figure is similar to Figure 1, showing the state in which the pedal body is tilted backwards after entering the detent, Figure 4 is a partial schematic explanatory diagram showing another embodiment of this invention, and Figure 5 is the Earth Hoger installed. Side view of the shovel loader, No. 6
The figure is a schematic explanatory diagram showing a conventional attachment pedal. In the figure, 1... Shovel loader, 2... Earth hoger, 10, 25... Machine frame, 11... Support bracket, 12... Pedal body, 14... Control valve, 15... Spool, 16, 20
...Connection rod, 18...Support pin, 27...Pedal stopper, 28...Joint pin, 29...Hole.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of a pedal body that is pivotally supported on a support bracket on the machine frame and connected via a connecting rod to a spool of a control valve with a detent related to the attachment; In the attachment pedal, the detent is engaged when the detent is tilted forward, and the pedal body is prevented from tilting forward just before the detent is engaged, and the pedal body is prevented from tilting forward when a predetermined pedal force is applied. 1. An attachment pedal for an industrial vehicle, characterized in that a pedal stopper made of an elastic material is attached to the machine frame so as to face the lower surface of the front end of the pedal body so that the pedal can be tilted further forward. (2) Registration of a utility model characterized in that the connecting rod and the pedal body are connected with play so that only the pedal body can be tilted backwards without moving the control valve spool when the pedal is detented. An attachment pedal for an industrial vehicle according to claim 1.