JPS6147275B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earth auger in which a leader that supports and guides an auger drive motor is extendable and retractable.

Since it is not necessary to maintain the leader of the earth auger at the working length when entering and exiting the work site or moving in the aisle, the present invention makes the leader telescopic so that it can be made smaller when not working. did. However, the present invention does not simply aim to miniaturize the device, but actively applies the expandable structure to forcibly press the auger into the hard surface layer at the beginning of drilling, and allows the auger to penetrate into the soft soil. The object of the present invention is to provide a material that can be perforated by its own weight.

An embodiment of the present invention will be described below in detail with reference to the drawings.
In FIG. 1, 1 is the cylindrical body of the leader, 2
is the main body 1 from the small diameter cylinder opening 1a at the upper part of the cylindrical main body 1.
This is a telescopic column inserted inside. A disk 2a that slides inside the cylindrical body 1 is located at the lower part of the telescopic column 2, and the lower part is connected to a hydraulic cylinder 3 housed in the lower half of the cylindrical body 1. Reference numeral 4 denotes a head on which a pulley, etc. on which a cable 6 led out from the main winch 5 is hung, is mounted, and a hydraulic drive motor 7 guided up and down by guide rods 8 and 8a can be raised and lowered by the cable 6. It's hanging. 7a is an auger. Reference numeral 9 designates a crotch-shaped lock arm as shown in an enlarged view in FIG. 2, which is moved forward and backward by a cylinder 10 located perpendicularly to the axis of the high cylindrical body 2 under the head and provided between the guide rods 8. During forward movement, the protruding piece 11 provided on the side of the leader of the drive motor 7 enters the crotch, and the motor 7 is fixed to the leader. S is the main switch that controls the raising and lowering of the auger 7a, and LS1 is the main switch that controls the lifting and lowering of the auger 7a.
LS2 is a limit switch that stops the retraction of the cylinder 3 when the retraction is completed, and when the drive motor 7 rises and reaches the bottom of the head 4, the LS2 extends the locking arm 9 and fixes the motor 7 to the leader. It is also a limit switch for extending the telescopic column 2 by the cylinder 3, and
LS3 is a limit switch for stopping the cylinder 3 when the telescopic column 2 completes its extension.
Reference numeral 12 denotes an electro-hydraulic control circuit which operates each hydraulic motor, cylinder, etc. in response to signals from the above switch group. 13 is a boom, and 14 is an auger rest. When drilling a vertical hole in the ground using the earth auger, first set the main switch S in the downward direction from the state shown in FIG. 3a. In this case, the main winch 5 does not operate, the drive motor 7 rotates while being fixed to the leader side by the lock arm 9, the telescopic column 2 is retracted by the cylinder 3, and the auger 7a is press-fitted into the ground surface layer and drilled. Then, the state shown in Figure 3b is reached, and the disk 2
When a presses the limit switch LS1, the retraction of the cylinder 3 is stopped, the lock arm 9 is retired, the drive motor 7 is freed, and the self-weight of the auger 7a performs drilling as shown in Fig. 3c. be exposed. When the auger 7a reaches a predetermined depth, the main switch 8 is switched to the upward direction, and the operation is performed in the reverse order to that shown in FIGS. 3a, b, and c. That is, the main winch 5 operates to pull the cable 6 and the auger 7 enters a predetermined depth.
Increase a. When the drive motor 7 hits the limit switch LS2, the lock arm 9 extends and the drive motor 7 is fixed to the leader side, and the main winch 5
stops, the cylinder 3 starts to extend the telescopic column 2, the auger 7a is pulled out, and the disk 2
When a hits limit switch LS3, cylinder 3
The operation of the telescopic column 2 stops and the extension of the telescopic column 2 stops. If you operate the main switch S during the above operation, the auger 7
It is possible to stop the ascent and descent of a midway and reverse the ascent and descent. In this case, the operation of the drive motor 7 can also be controlled by a separate switch.

In addition, in the state shown in Fig. 1, if another guide rod (not shown) is connected between guide rods 8 and 8a and the locking arm 9 is retired, the auger can be used only by lowering its own weight like a normal auger. I can do it. Also, retract the telescopic column 2, remove the lower half of the leader's cylindrical body 1 from the joint 1b, raise the cylinder 3, disassemble the auger 7a, etc.
When the cylindrical body 1 is brought closer to the boom 13 side by the cylinder 14, it is convenient to carry it into and out of the work site.

The present invention is as described above, and since the leader can be shortened by using the upper half of the leader as a telescopic column, transportation and handling are convenient.Furthermore, the auger can be forcibly inserted and removed when the telescopic column is expanded or contracted, so it can be used in places with hard ground, especially in viscous soil. It can be used as a powerful auger for initial drilling in the surface layer, and when the telescopic column is fully extended, it can also be used as a normal earth auger by supplementing the guide rod. Rather than being weak, it has characteristics that make it as powerful as a large machine.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal side view of an embodiment of the present invention;
Figure 2 is an enlarged side view of the main parts of the same as above, Figure 3a,
bc is a reduced simplified side view showing a drilling operation using the same as above. In the figure, 1... cylindrical body of the leader, 2... telescopic column, 3... hydraulic cylinder, 4... head, 7...
Hydraulic drive motor, 7a...Auger, 8, 8a...
Guide rod, 9...Lock arm, 10...Hydraulic cylinder, 11...Protrusion, S...Main switch, LS
1, LS2, LS3...Limit switch.

Claims (1)

[Claims] 1. The upper half of the leader with the mounting head of the pulley is inserted into the cylindrical body of the lower half of the leader as a telescoping column so that it can be moved in and out to any desired length by hydraulic means, and the head neck with the guide rod of the auger drive motor is installed. The cylindrical body is provided with a hydraulic cylinder that advances and retreats the locking arm perpendicular to the axis of the cylindrical body, so that the locking arm and the locking member on the auger drive motor side can be engaged male-femally when the cylinder is extended. , an earth auger characterized in that a guide rod can be supplemented in the extension section.