JPH0255594B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a plurality of rods used for drilling work such as underground pile holes and anchor pile holes in civil engineering construction work, and rods for other uses where high torsion acts. This relates to the connection structure of rods when connecting them in stages to make them long.

[Conventional technology]

Conventionally, this type of rod-to-rod connection has been made by cutting screws and screwing them together.

[Problem that the invention seeks to solve]

Such a conventional rod connection structure has the problem that it cannot be screwed together without using a large-sized tightening torque machine, and the workability is poor and it cannot be done safely and quickly by hand.

[Means for solving problems]

The present invention aims to solve such problems and provide a rod connection structure that allows rods to be connected and separated easily and quickly by hand. A spline 10 is provided on the inner surface, a spline 20 is provided at the tip of the outer periphery of the second rod 2 connected to the first rod 1, and a spline 20 is provided on the outer periphery of the second rod 2 at a predetermined distance from the spline in the axial direction. A running guide ridge 21 is provided protrudingly, and a stopper ring 22 is fitted in the middle of the guide ridge, and the guide ridge 21 above the stopper ring is fitted.
A sliding tube 24 with a screw 23 carved on the outer periphery is fitted into the part, and a plurality of tapered key pieces 25 are protruded from the tip periphery of the sliding tube to slide along the side surface of the guide ridge 21.
A rotary operation tube 26 is attached which is screwed to the outer periphery of the sliding tube 24, and the width of the guide ridge 21 and the key piece 25 are
The rod connection structure has a sum of the widths equal to the length of the groove width of the spline 10. Note that 27 is the inclined end surface of the spline 20.

[Effect]

In this invention, the second rod 2 is inserted into the hollow end of the first rod 1 to connect the spline 1 of the rod 1.
A part of the tip of 0 is the guide ridge 2 of the second rod 2
Insert until it engages with 1. At this stage, the key piece 25 is not completely inserted and only the tapered part is inserted, so the first rod 1 has some play to rotate. Next, in this state, if the rotary operation tube 26 is rotated, the sliding tube 24 screwed therewith will move in the direction of the first rod 1 along the guide ridge 21.
Due to this movement of the sliding tube 24, the key piece 25 slides along the side surface of the guide ridge 21. and key piece 2
5 deeply enters the groove between the splines 10 of the first rod 1, the key piece 25 presses against the side wall of the spline 10, causing the rod 1 to rotate slightly. The sum of the widths of the guide ridge 21 and the key piece 25 is the spline 10
Since the width is equal to the inner groove width, if the key piece 25 enters deeply, the first rod 1 will be locked without wobbling. The rotation of the first rod 1 causes the spline 1 to
The rear end surface of the second rod 1 is engaged with the inclined end surface 27 of the spline 20 of the second rod, so that the first rod 1 cannot be pulled out while being inserted. The high torsion acting on rods 1 and 2 is spline 10.
The axial force of the rod is transmitted via the guide ridge 21 and the key piece 25, and the axial force of the rod acts on the inclined end surface 27 of the spline 20 and the stopper ring 22, so that the axial force can be applied in either the tensile or compressive direction. can.

Next, when separating the first rod 1 and the second rod 2, the rotary operation cylinder 26 is rotated in the opposite direction to move the sliding cylinder 24 inward of the second rod 2.
By pulling out the key piece 25 from the groove between the splines 10, the first rod 1 and the second rod 2 are unlocked, and then the first rod 1 is slightly rotated to remove the spline 10 from between the splines 20. By pulling it out, rod 1 and rod 2 can be separated.

〔Effect of the invention〕

As described above, according to the present invention, two rods can be connected and separated easily and quickly by manually rotating the rotary operation cylinder 26 from the outside, and can sufficiently withstand high torsion and axial force. It has the effect of being able to do whatever you want.

[Brief explanation of drawings]

Fig. 1 is an exploded assembly view showing the connecting structure of the rod of the present invention, Fig. 2 is a partially cutaway front view showing the connected state of the rod, Fig. 3 is a sectional view taken along the line - Fig. 1, and Fig. 4 is a FIG. 1 is a sectional view taken along the line 1-- and FIG. 5 is an explanatory view showing the unfolded arrangement of the spline, the guide ridge 21, and the key piece. 1, 2: Rod, 10, 20: Spline, 2
1: Guide ridge, 22: Stopper ring, 23: Screw, 24: Sliding tube, 25: Key piece, 26: Rotating operation tube.

Claims (1)

[Claims] 1 A spline 10 is provided on the inner surface of the hollow end of the first rod 1, a spline 20 is provided on the outer peripheral tip of the second rod 2 connected to the first rod 1, and a second rod 20 is provided at a predetermined distance from the spline. A guide ridge 21 extending in the axial direction is provided on the outer periphery of the rod 2, and a stopper ring 22 is fitted in the middle of the guide ridge.
A sliding tube 24 with a screw 23 carved on the outer periphery is fitted into the part, and a plurality of tapered key pieces 25 are protruded from the tip periphery of the sliding tube to slide along the side surface of the guide ridge 21.
A rotary operation tube 26 is attached which is screwed to the outer periphery of the sliding tube 24, and the width of the guide ridge 21 and the key piece 25 are
A rod connection structure in which the sum of the widths of is equal to the length of the groove width of the spline 10.