JP3266234B2 - Crawler type rotary percussion drill misoperation prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a selector lever having two positions of running and working, and a pair of pump operating levers having three positions of neutral, forward and backward and two positions of neutral and operating. Crawler type rotary percussion drill.

[0002]

2. Description of the Related Art In a crawler type rotary percussion drill PD shown in FIG. 6, a selector lever 1A shown in FIG. 7 is pivotally mounted on a bracket 3A and can be switched between a working position W and a traveling position D, and locks each position. It is locked by the pin 4A. Therefore, the lock pin 4A can be removed arbitrarily.

The pump operation levers 10a, 10a shown in FIG.
Reference numeral b (hereinafter, generally denoted by reference numeral 10) indicates an embodiment of the present invention. Of these, known parts will be described for better understanding of the present invention. The lever 10 is pivotally attached to a support bracket 12 and can be switched between a neutral position N, a forward position (also serving as a working position w) F, and a retreat position R.
It can be fixed to the bracket 12 by the wing nut 11.

When drilling with this drill, the selector lever 1A is switched to the working position W and locked with the lock pin 4, and the pump operating lever 10 is switched to the forward position F and fixed with the wing nut 11 for work. When the drill is moved after the drilling is completed, the pump operation lever 10 is switched to the neutral position N, and the selector lever 1A is switched from the working position N to the traveling position D. However, when the selector lever 1A is switched from the working position W to the traveling position D while the pump operating lever 10 is tilted to the forward position F, the drill immediately advances. At this time, the pump operation lever 10 is
Since it is fixed to the forward position F at 1, the forward movement cannot be stopped, which is dangerous.

The present invention has been made to solve the above-mentioned problem, and has as its object to provide a crawler type rotary percussion drill erroneous operation prevention device for preventing erroneous operation at the time of traveling switching.

[0006]

According to the present invention, there is provided a selector lever having two positions of travel and work, and a pair of pumps having three positions of neutral, forward and backward and two positions of neutral and work. A crawler-type rotary percussion drill having a lever, a pair of neutral position detecting microswitches for detecting a neutral position of each of the pump operating levers, and a solenoid for projecting a lock rod for preventing switching of the selector lever when not energized. And a traveling position detecting microswitch for detecting a traveling position, and the microswitch and the solenoid constitute an electric circuit in which the solenoid is excited when both neutral detecting microswitches are closed.

[0007]

In the crawler-type percussion drill configured as described above, when the selector lever is in the working position and the pump operating lever is not in the neutral position, the lock rod of the solenoid projects and the working position of the selector lever is reduced. From the switch to the running position.

Therefore, even if the selector lever is erroneously switched from the working position to the traveling position while the pump operating lever is moved to the working position after the drilling operation is completed, the selector rod cannot prevent the switching operation.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a bracket 12 has a pair of pump operation levers 10a and 10b, which detect a neutral position N and close the neutral position detecting microswitches 13a and 13b.
b are provided respectively.

In FIG. 2 and FIG.
Is pivotally attached to the support bracket 2 and can be switched between a working position W and a traveling position D. A yoke-shaped bracket 3 is provided above the support bracket 2. A lock pin 4 for preventing switching of the selector lever 1 is provided on the bracket 3 so as to be movable in an arrow direction. The bracket 3 is provided with a stopper 5 for locking the lock pin 4 in a blocked state. I have.

A solenoid 6 is provided on the bracket 3 in parallel with the lock pin 4, and an operating end of the solenoid 6, that is, a lock rod 7, prevents switching of the selector lever 1 in a protruding state. . The bracket 3 is provided with a travel position detection microswitch 8 that detects and closes the travel position of the selector lever 1.

FIG. 5 shows each of the switches 8, 13a and 13b.
And an electric circuit diagram of the solenoid coil 6a. Solenoid 6 operated by this solenoid coil 6a
The lock rod 7 protrudes as shown in FIG. 4 when not excited, and retracts as shown in FIG. 3 when excited. When the switches 13a, 13b or the microswitch 8 are closed, the solenoid coil 6a is excited by the battery B. (The solenoid coil 6a is incorporated in the solenoid 6, but is separately shown in FIG. 5 for explanation.) Next, the operation will be described.

When starting the engine of the drill PD,
If the selector lever 1 is not set to the working position W, it does not start as in the prior art. Then, when the engine is started, the power is turned on to the solenoid coil 6a, and when the pump operation levers 10a and 10b are in the neutral position N, the micro switches 13a and 13b are closed and the solenoid coil 6a is closed.
Is excited, and the lock rod 7 is retracted (FIG. 3). Therefore, the selector lever 1 can be switched from the working position W to the traveling position D. When the selector lever 1 is switched to the traveling position D, the micro switch 8 is closed, and the lock rod 7 remains at the retracted position even if the pump operation levers 10a and 10b are switched to the forward position F or the backward position R.

When drilling, the selector lever 1 is switched to the working position W, the pump operating levers 10a, 10b are switched to the forward position F, and fixed with the wing nuts 11, 11.

When drilling is completed and the drill PD is to be moved, the wing nuts 11 of the pump operation levers 10a and 10b,
11 is switched to the neutral position N, and the selector lever 1 is switched from the working position W to the traveling position D. At that time, by mistake, the wing nuts 11 of the pump operation levers 10a, 10b,
Even if the selector lever 1 is switched from the working position W to the traveling position D while the lever 11 is not loosened and is fixed at the forward position F, the switching cannot be performed because the lock rod 7 of the solenoid 6 projects. Here, when the wing nuts 11, 11 of the pump operation levers 10a, 10b are loosened and switched to the neutral position N, the lock rod 7 of the solenoid 6 is moved.
, The switching of the select lever 1 from the working position W to the traveling position D becomes possible.

[0017]

According to the present invention, as described above, the erroneous operation at the time of traveling switching can be reliably prevented and safety can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a pump operation lever which is a part of an embodiment of the present invention.

FIG. 2 is a side view showing a selector lever which is a part of one embodiment of the present invention.

FIG. 3 is a top view of FIG. 2;

FIG. 4 is a drawing corresponding to FIG. 3, showing a lock rod projecting state.

FIG. 5 is an electric circuit diagram.

FIG. 6 is a perspective view showing a crawler type percussion drill in which the present invention is implemented.

FIG. 7 is a perspective view showing the selector lever of FIG. 6;

[Explanation of symbols]

 D: running position F: forward position N: neutral position R: retreat position W, w: working position 1, 1A: selector lever 2: support bracket 3, 3A ..Bracket 4, 4A Lock pin 5 Stopper 6 Solenoid 6a Solenoid coil 7 Lock rod 8 Running position detection microswitch 10a, 10b Pump operation Lever 11: Wing nut 12: Bracket 13a, 13b: Neutral position detection switch

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02F 9/24 E02F 9/20 E21B 6/02

Claims (1)

(57) [Claims] 1. A crawler-type rotary percussion drill comprising a selector lever having two positions of travel and work, and a pair of pump operation levers having three positions of neutral, forward and backward and two positions of neutral and work. A pair of neutral position detecting microswitches for detecting the neutral position of each of the pump operating levers, a solenoid for projecting a lock rod for preventing switching of the selector lever when not energized, and a running position detecting micro for detecting a running position. A crawler-type rotary percussion drill erroneous operation prevention device comprising: a switch; and an electric circuit configured to excite the solenoid when the neutral switches are closed by the respective microswitches and solenoids.