JPH06126525A - Broach shank gripping device - Google Patents

Abstract

PURPOSE:To provide a broach shank gripping device, capable of gripping a broach shank having a different diameter. CONSTITUTION:This device is to grip a broach shank 11. A shank insertion hole 13, into which the broach shank 11 is inserted, and a gripping member 14, having at least two stages, are provided on a main body 12; and when the gripping member 14 is protruded in the shank insertion hole 13, the constriction part 11' of the broach shank 11 and the vicinity of the constriction part 11' are gripped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broach shank gripping device capable of gripping broach shanks having different diameters.

[0002]

2. Description of the Related Art A conventional broach shank gripping device (hereinafter referred to as a conventional example) generally has a structure shown in FIG. 1 and cannot grip broach shanks having different diameters.

A detailed description will be given below.

In the conventional example shown in FIG. 1, a shank insertion hole 2 is provided in a main body 1 of a gripping device, a sleeve 3 is slidably fitted in the main body 1, and the main body 1 is also fitted with a sleeve 3. Has a structure in which four claw members 4 are radially arranged with respect to the axis of the main body 1 so as to project into the shank insertion hole 2, the broach shank 5 is inserted into the shank insertion hole 2, and the sleeve 3 is inserted. When it is slid to the tip side of the main body 1, the claw member 4 projects into the shank insertion hole 2 by the sliding of the sleeve 3, the claw member 4 grips the constricted portion 5 ′ of the broach shank 5, and the broach shank 5 is It is gripped by the shank insertion hole 2 and the claw member 4.

[0005]

Therefore, in the conventional example, when a broach shank 5 having a diameter smaller than the diameter of the shank insertion hole 2 is inserted into the shank insertion hole 2, a long one is held at one place by the claw member 4. Since the broach shank 5 is wobbled in the shank insertion hole 2 because it is gripped, the broach shank 5 cannot be reliably gripped. Further, the projection amount of the claw member 4 is also predetermined, and from this point as well, the conventional example cannot hold the broach shank 5 having a diameter smaller than the diameter of the shank insertion hole 2.

Therefore, in the conventional example, the shank insertion hole 2 or the main body 1 must be adapted to the diameter of the broach shank 5 after all.

It is a technical object of the present invention to solve the above problems and provide a broach shank gripping device capable of gripping broach shanks having different diameters.

[0008]

The gist of the present invention will be described with reference to the accompanying drawings.

For grasping the broach shank 11, a shank insertion hole 13 into which the broach shank 11 is inserted is provided in the main body 12, and a grasping member 14 is provided in at least two stages in the main body 1 to project the grasping member 14. The present invention relates to a broach shank gripping device, characterized in that it is configured to grip the constricted portion 11 ′ of the broach shank 11 and the vicinity of the constricted portion 11 ′ when it is crimped.

[0010]

The broach shank 11 is securely gripped because it is gripped at the constricted portion 11 'and at least two places near the constricted portion 11'.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 2, 3 and 4 show an embodiment of the present invention, which will be described below.

This embodiment can be applied to, for example, an upper gripping device and a lower gripping device of a work moving type broaching machine as shown in FIG.

Reference numeral 16 is an elevating table on which the work W is placed.

Next, this embodiment will be described in detail with reference to FIGS.

The main body 12 is composed of two stages of an upper cylinder portion 12a and a lower cylinder portion 12b, and the upper cylinder portion 12a and the lower cylinder portion 12b are rotatably arranged, respectively. In FIG. 3, a shank insertion hole 13 is formed vertically.

Two gripping members 14 are arranged in the upper cylinder portion 12a so as to face each other, and two gripping members 14 are also arranged in the lower cylinder portion 12b so as to face each other. The tip of each of the gripping members 14 is set to a gripping portion having a curved concave surface 14 ′, and the lower gripping member 14 attaches the constricted portion 11 ′ of the broach shank 11,
Further, the upper gripping member 14 is configured to be capable of gripping the shank nominal diameter portion on the upper side of the constricted portion 11 'in a state of abutting at four points.

A cylindrical contact portion is provided at the base end of each gripping member 14.
17 is formed and is brought into contact with a cam surface 15 formed on the inner peripheral surfaces of the upper tubular portion 12a and the lower tubular portion 12b (the abutting portion 17 and the cam surface 15 are in vertical line contact).

Reference numeral 18 is a spring for biasing each gripping member 14 elastically to maintain the maximum open state, and reference numeral 19 is a stopper pin of the broach shank 11.

The upper cylinder portion 12a and the lower cylinder portion 12b are rotated by appropriate means.

Since this embodiment has the above-mentioned structure, the following operational effects are exhibited.

When the broach shank 11 having an arbitrary diameter is inserted into the shank insertion hole 13 and the upper cylinder portion 12a and the lower cylinder portion 12b are rotated by an appropriate means, each gripping member 14 is shank-inserted by the cam surface 15. Brooch shank protruding into hole 13
The constricted portion 11 'of 11 and the upper side of the constricted portion 11' are the gripping members.
The broach shank 11 is securely gripped and fixed by the four-point support and the two-stage gripping.

When removing the brooch shank 11,
When the upper tubular portion 12a and the lower tubular portion 12b are rotated, the respective holding members 14 are retracted, and the holding of the broach shank 11 is released. The present embodiment makes it possible to reliably grip a plurality of types of broach shanks 11 having different diameters due to the above-described configurations, operations, and effects.

[0023]

As described above, according to the present invention, since the constricted portion of the broach shank and at least two places in the vicinity of the constricted portion are gripped in the shank insertion hole, even if the diameter of the broach shank is smaller than that of the shank insertion hole. The broach shank is reliably gripped, and therefore, it is possible to provide a broach shank gripping device that can securely grip broach shanks having different diameters.

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view of a conventional example.

FIG. 2 is an explanatory diagram of a usage state of the present embodiment.

FIG. 3 is a sectional view of the present embodiment.

FIG. 4 is an explanatory plan view of an upper cylinder portion or a lower cylinder portion of this embodiment.

FIG. 5 is a perspective view of a main part of a usage state of the present embodiment.

[Explanation of symbols]

 11 Brooch Shank 11 'Constriction 12 Body 13 Shank insertion hole 14 Grip member

Claims (1)

[Claims] 1. A device for gripping a broach shank, the main body having a shank insertion hole into which the broach shank is inserted, the main body being provided with at least two gripping members, and the gripping member protruding into the shank insertion hole. A broach shank gripping device, which is configured to grip a constricted part of a broach shank and the vicinity of the constricted part when it is squeezed.