JPH0527199U - Connection structure of drive shaft and screw - Google Patents

Abstract

(57) [Summary] [Purpose] The drive shaft and screw can be connected in a short time, and they do not come off during rotation. [Structure] A pin hole 12 is provided in a fitting hole 10 of the drive shaft 5,
A pin hole 15 is provided in the fitting shaft portion 13 of the screw 8, and a pin 16 fitted into the pin holes 12 and 13 is provided with a spring member 19 that snaps into the outer peripheral surface of the drive shaft 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for connecting a drive shaft and a screw in a tubular body propulsion device in which a small-diameter tubular body is propulsively embedded in the ground.

[0002]

[Prior Art]

 It is equipped with a propulsion device equipped with a drive shaft, a leading conduit, an auger head, and a screw that transmits rotational torque to the auger head.The propulsion device applies thrust to the leading conduit through the tubular body to drive the driving shaft and screw. An auger-type tubular propulsion device is known in which the tubular body is propelled and buried in the ground by connecting and transmitting rotational torque to the auger head to convey earth and sand. In such a tubular propulsion device, when the propulsion device propels the tubular body for a predetermined stroke, the propulsion device is retracted and a new tubular body and screw are installed and propelled again. It is connected.

[0003]

[Problems to be solved by the device]

 However, if the drive shaft and screw are connected with bolts and nuts, the time to tighten the bolt is very wasteful, it takes time to use a tool such as a wrench or ratchet, and there is no space around the drive shaft. The work of tightening the bolts is very troublesome, and it takes time to connect the drive shaft and the screw. Also, the bolt may loosen and come off during rotation of the screw by the drive shaft.

Therefore, an object of the present invention is to provide a connecting structure for a drive shaft and a screw of a tubular propulsion device, which is capable of solving the above-mentioned problems.

[Means for Solving the Problems]

 The drive shaft and the screw are provided with a fitting hole and a fitting shaft portion, a pin is inserted through the fitting hole and the fitting shaft portion, and a spring material is provided on the pin for snap-fitting the drive shaft.

[Operation] The drive shaft and screw can be connected and separated by inserting and withdrawing the pin, and the spring can prevent the pin from slipping out.

[0005]

【Example】

 As shown in FIG. 1, the propulsion device 1 is provided with a drive shaft 5 on a main body 4 that moves forward and backward along a rail 2 with a cylinder 3, and the drive shaft 5 is driven by a motor 6. A screw 8 is arranged in the screw 7, and the tubular body 7 is propelled by the propulsion device 1, and at the same time, the screw 8 is connected to the drive shaft 5 to transmit the rotational torque. As shown in FIG. 2, the drive shaft 5 is formed with a fitting hole 10, a notch recess 11 and a pin hole 12, and an end of the screw 8 has a fitting shaft part 13, a notch recess 14 and a pin hole 15. When it is formed and the fitting hole 10 and the fitting shaft portion 13 are fitted to each other, the notch recesses 11 and 14 are engaged with each other so that the pin holes 12 and 15 are aligned with each other. As shown in FIGS. 3 and 4, a nut 17 is screwed into the upper portion of the pin 16 fitted into the pin holes 12 and 15, and an axial slit 18 is formed. The slit 18 has a substantially semicircular shape. The spring material 19 of the shape is inserted and supported by the nut 17. When the nut 17 is held by hand and the pin 16 is inserted into the pin holes 12 and 15 as shown in FIG. 5, the spring material 19 is attached to the outer peripheral surface of the drive shaft 5. When they come into contact with each other and are further pushed down, the spring member 19 expands and deforms as shown in FIG. The spring force of the spring member 19 is such that the pin 16 can be easily pulled out by hand and does not come off during the rotation of the screen 8, so that the pin 16 can be easily inserted into or pulled out from the pin holes 12 and 15. It does not come off while the screw is rotating. It is also possible to use a snap ring as the spring material 19, and the spring material 19 may be welded or integrally manufactured with the pin, and the pin 16 can be easily held by hand. Therefore, a handle or the like may be provided.

[0006]

[Effect of the device]

 The drive shaft 5 and the screw 8 can be connected in a short time simply by inserting and withdrawing the pin 16 into and from the pin holes 12 and 15, and the spring member 19 prevents the pin 16 from slipping out and is prevented from coming off during screw rotation. It can be prevented.

[Brief description of drawings]

FIG. 1 is a plan view of a propulsion device.

FIG. 2 is an exploded perspective view of a connecting portion between a drive shaft and a screw.

FIG. 3 is a front view of a pin and a spring member.

FIG. 4 is a side view of a pin and a spring member.

FIG. 5 is a sectional view showing a state in which a pin is inserted.

FIG. 6 is a cross-sectional view of a connected state.

[Explanation of symbols]

5 drive shaft, 8 screw, 10 fitting hole, 12 pin hole, 13 fitting shaft part, 15 pin hole, 16 pin, 1
9 Spring material.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Saito 3-1-1 Ueno, Makikata-shi, Osaka Komatsu Ltd. Osaka factory

Claims (1)

[Scope of utility model registration request] 1. A driving shaft 5 and a screw 8 are provided with a fitting hole 10 and a fitting shaft portion 13 which are fitted to each other, and the pin hole 12 of the fitting hole 10 and the pin hole 15 of the fitting shaft portion 13 are provided in the fitting hole 10. A connecting structure of a drive shaft and a screw, characterized in that a spring member 19 which is fitted to the outer peripheral surface of the drive shaft 5 in a snap manner is provided on the pin 16 to be inserted.