JP2532969Y2 - Drive shaft and screw connection structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which a screw is connected to a drive shaft in a tube propulsion machine in which a small-diameter tube is propelled and buried underground.

[0002]

2. Description of the Related Art A propulsion device having a drive shaft, a leading conduit,
An auger head and a screw that transmits rotational torque to the auger head are provided.Thrust is applied to the leading conduit through the pipe by the propulsion device, and the drive shaft and the screw are connected to transmit the rotational torque to the auger head and sediment. There is known an auger-type tube propulsion device in which a tube is propelled and buried underground by transporting the tube. In such a tube propulsion device, when the tube is propelled by a predetermined stroke with the propulsion device, the propulsion device is retracted and the tube and the screw are newly provided and propelled again.
The screw and the screw and the screw and the drive shaft are connected with bolts and nuts.

[0003]

However, if the drive shaft and the screw are connected by a bolt and nut, the time for tightening the bolt is very wasteful, and it takes time and effort to use a tool such as a wrench or a ratchet. Since there is no space around the shaft, the work of tightening bolts is very troublesome, and it takes time to connect the drive shaft and the screw. Further, the bolt may be loosened and removed during rotation of the screw by the drive shaft.

Accordingly, an object of the present invention is to provide a connecting structure of a drive shaft and a screw of a tubular body propulsion device which can solve the above-mentioned problem.

A drive shaft and a 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 the pin is snap-fitted to the drive shaft. A spring material that matches.

[Operation] The drive shaft and the screw can be connected and separated by inserting and removing the pin, and the pin can be prevented from coming off with the spring material.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a propulsion device 1 is provided with a drive shaft 5 on a main body 4 which moves forward and backward by a cylinder 3 along a rail 2, and the drive shaft 5 is driven by a motor 6. In addition, a screw 8 is provided in the pipe 7, the pipe 7 is propelled by the propulsion device 1, and the screw 8 is connected to the drive shaft 5 to transmit a rotational torque. As shown in FIG. 2, a fitting hole 10, a cutout recess 11, and a pin hole 12 are formed on the drive shaft 5, and a fitting shaft portion 13, a cutout recess 14, and a pin hole 15 are formed at an end of the screw 8. Then, when the fitting hole 10 and the fitting shaft portion 13 are fitted, the notch concave portions 11 and 14
And the pin holes 12 and 15 are aligned. As shown in FIGS. 3 and 4, a nut 17 is screwed into an upper portion of the pin 16 fitted in the pin holes 12 and 15, and an axial slit 18 is formed.
A substantially semicircular spring member 19 is inserted into the slit 18 and is supported by a nut 17, and as shown in FIG.
When the spring member 19 is inserted, the spring member 19 comes into contact with the outer peripheral surface of the drive shaft 5, and when the spring member 19 is further depressed, the spring member 19 expands and deforms as shown in FIG. I do. The spring force of the spring member 19 can be easily adjusted by hand.
The pin 16 can be easily inserted into or removed from the pin holes 12 and 15 while the screw 16 is rotating, and the pin 16 does not come off during the screw rotation. It is also possible to use a snap ring to which the spring material 19 is applied.
The attachment of 9 may be made by welding or manufacturing integrally with the pin.
Further, a handle or the like may be provided to facilitate holding the pin 16 by hand.

[0006]

The drive shaft 5 and the screw 8 can be connected in a short time only by inserting and removing the pin 16 into and out of the pin holes 12 and 15, and the spring material 19 prevents the pin 16 from coming out and prevents the screw 16 from rotating during rotation. Detachment can be prevented.

[Brief description of the 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 material.

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

FIG. 5 is a sectional view showing a state where a pin is inserted.

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

[Explanation of symbols]

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

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroshi Saito, 3-1-1 Ueno, Makikata-shi, Osaka Komatsu Ltd. Inside the Osaka Plant (56) References Fully open Showa 64-10591 (JP, U) Fully open Hei 2-120595 (JP, U) Actually open 1983-29688 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] A fitting hole (10) and a fitting shaft (13) are provided for fitting the drive shaft (5) and the screw (8) with each other, and a pin hole (12) of the fitting hole (10) and a pin hole (15) of the fitting shaft (13) are provided. A coupling structure between a drive shaft and a screw, wherein a spring member 19 is provided on a pin 16 to be inserted so as to snap into an outer peripheral surface of the drive shaft 5.