JPS6235754Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an auger shaft coupling device that can reliably connect the auger shaft of an earth auger to a driving shaft.

Generally, in earth augers, an auger shaft with an auger attached at the lower end is detachably connected to a driving shaft suspended from a boom, so if the connection device is incomplete, it may cause serious damage during work. There is a risk that the heavy auger shaft may come off the drive shaft and cause an accident.

Therefore, the applicant previously proposed an auger shaft coupling device as shown in Japanese Utility Model Publication No. 1205/1983, but in this coupling device, the aforementioned coupling part is buried in the soil and rotates when digging a hole. Therefore, if a force is applied by earth and sand in the direction of releasing the connection and securing with the auger shaft, the stopper may come off and the auger may be inadvertently extended or shortened.

Moreover, if you forget to operate the stopper, you will no longer be able to maintain the connected state and the connecting pin will fall off.

In view of the above, the object of the present invention is to provide a coupling device that can reliably connect an auger shaft to a driving shaft and that can be easily attached and detached.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a telescoping boom 1 is pivotally connected to a rotating base (not shown) so as to be able to rise and fall freely, and an earth auger 2 is supported at the tip of the telescoping boom 1. .
The earth auger 2 is composed of a driving shaft 3 suspended from the tip of the telescopic boom 1, and an auger shaft 4 connected to the driving shaft 3 via a coupling device c, which will be described later. is connected to a prime mover 5 supported by the telescopic boom 1, and is rotationally driven by the prime mover 5. The driving shaft 3 has an angular cross section, and a plurality of pin holes 6 are arranged in a row at intervals in the lower part thereof. The auger shaft 4 is provided with a screw-shaped auger 7 at its lower part, the upper end of which is formed hollow, and is inserted into and inserted into the driving shaft 3 in a freely removable manner.

Next, the coupling device c for removably coupling the auger shaft 4 to the driving shaft 3 will be explained below. The perforated locking cylinder 10 is set upright.
A connecting pin 11 passes through the locking cylinder 10, and the inner end of the connecting pin 11 can be selectively fitted into one of the pin holes 6. A compression spring 12 is compressed between the step of the connecting pin 11 and the inner wall of the locking tube 10 in the locking tube 10, and the end of the compression spring 12 is fixed to the connecting pin 11 and the locking tube 10. The compression spring 12 serving as the lever urges the connecting pin 11 while giving it a constant rotational force while springing it inward. Further, an operating handle 13 is fixed to the upper part of the connecting pin 11, and an L-shaped engagement member 14 is fixed to the lower surface of the operating handle 13. on the other hand,
The compression spring 1 is provided between the auger shaft 4 and the locking cylinder 10.
The above-mentioned engaging member 14 is biased with rotational force by 2.
An engaged member 15 that is always engaged with is fixed.

Next, to explain the operation of the present invention, in order to connect the auger shaft 4 to the driving shaft 3, the connecting pin 11 is rotated clockwise through the operating handle 13 against the elastic force of the compression spring 12. At the same time, after pulling upward and separating the engaging member 14 from the engaged member 15, align one of the pin holes 6 arranged in the driving shaft 3 with the through hole 9 of the locking cylinder 10, After that, when the connecting pin 11 is rotated clockwise again and pushed into the pin hole 6 direction, the connecting pin 11 is inserted into the engaging member 14.
Due to the engagement of the engaged member 15 with the compression spring 12
It is fitted into the pin hole 6 of the driving shaft 3 with the elastic force of , and at the same time, a rotational force is applied in the direction to constantly engage the engaged member 15 .

Incidentally, when the auger shaft 4 is to be removed from the driving shaft 3, it is sufficient to perform the operation in the opposite manner to that described above.

As described above, according to the present invention, the auger shaft and the driving shaft can be connected detachably, and at this time, since the connecting pin is given a constant compressive force and rotational force, the auger shaft can be connected to the driving shaft. It is securely connected to the shaft and will not come off from the driving shaft even if a force is applied in the direction of releasing the connection during drilling work. Moreover, it has a practical advantage of eliminating the need for engaging and disengaging the stopper.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Figure 1 is a partial side view of an earth auger equipped with the device of the present invention, Figure 2 is a partially enlarged view of Figure 1 with the driving shaft removed, and Figure 3 is a partial side view of the earth auger equipped with the device of the present invention. 2 is a plan view of FIG. 2, FIG. 4 is a sectional view of the coupling device, and FIG. 5 is a sectional view taken along the line of FIG. 4. 3... Driving shaft, 4... Auger shaft, 10... Locking tube, 11... Connection pin, 14... Engaging member, 15
...Engaged member.

Claims (1)

[Scope of utility model registration request] A driving shaft, a locking tube installed upright in a through hole drilled in the auger shaft that is inserted into the driving shaft, and a locking tube that passes through the locking tube and is inserted into a pin hole drilled in the driving shaft. An engaging member is fixed to one side and an engaged member to the other between the auger shaft and the connecting pin, and the connecting pin is fixed to the engaging member and the engaged member. An auger shaft coupling device for an earth auger, characterized in that the auger shaft coupling device for an earth auger is biased toward the pin hole while applying a rotational force in the direction of engagement.