JPS628963Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clamp tool, and is concerned with improving a tightening mechanism for mechanically tightening and securely press-fitting a holed throw-away tip of a clamp tool to a shank. In other words, Japanese Utility Model Publication No. 49-26169, which is known as a prior art, uses a pressing member to create a bending force in the direction of bending the head of the fixing pin located in the chip hole, and a pressing force from the top surface of the chip. A configuration for fixing the chip is described. This configuration requires strict mechanical precision of the chip, making it unsuitable for use as a throw-away chip.Also, since the fulcrum of the force pressing toward the fixed pin and the force pressing from the top of the chip are the same, the cutting direction cannot be changed. There were problems such as instability in different cases.

This proposal is a proposal to solve these problems, and involves making a notch in one end of the presser member, separating the gap and forming two opposing upper and lower pieces, with a tip at the tip of each piece. The holding member is brought into contact with the upper and rear surfaces of the holding member, respectively, and the other end is connected to form a two-pronged integral body, giving the holding member springiness as a whole.

To explain in detail with reference to the embodiments in the drawings, in Figs. 1 and 2, reference numeral 1 is a throwaway type chip, which forms an equilateral triangle, uses each corner as a cutting edge, and has a through hole 5 in the center. , are located in the chip seat 3 in communication with the through holes of the security deposit 2, and the fixing pin 4 is screwed and implanted from the chip seat 3 to the tool holder 6 through these through holes. The cutting tool holder 6 is provided with a stepped portion 10 higher than the tip seat to accommodate a presser member 11. The rear end of the step forms a step wall 13 that slopes at a high obtuse angle rearward and reaches a shank. The holding member is cut deeply from one end to form the gap 19.
The upper and lower pieces 16 and 18 that form the
is supported at the lower corner of the stepped wall 13. The tips of the upper and lower pieces 16 and 18 are in contact with the upper and rear surfaces of the chip, respectively, and the through holes 8 and 9 of these upper and lower pieces are communicated with the gap 19, so that the holding member 11 can be held at the stepped portion by the mounting bolt 14. When screwed and fixed to 10, the upper piece 1
The claw portion 15 at the tip of the lower piece 18 presses against the top surface 7 of the chip 1, and the front surface portion 17 at the tip of the lower piece 18 presses against the rear side of the chip 1 and presses the fixing pin 4 through the central through hole 5.
Tighten the tip 1 toward the step wall 13 so that the outer end
press against.

With the above structure, the presser member 11 in which the upper and lower bifurcated pieces 16 and 18 are integrally joined at the rear part 22 is provided with cushioning properties in the vertical direction, and is housed with a gap between it and the stepped portion 10. Therefore, the cushioning property is further ensured, and the upper piece 16 acts as a cantilever beam with the root 20 of the notch gap 19 as a fulcrum against the upper surface of the chip 1, and the claw part 15 exerts a pressing action, while the lower piece The front face 17 of the front end of the chip 18 presses uniformly against the rear surface of the chip 1 toward the fixing pin 4 through the through hole 5 at the center of the chip, and the rear end is supported by the lower end of the stepped wall 13. Thus, by communicating the through holes 8, 9 of the presser member and the gap 19 of both members 16, 18 and tightening the tightening bolt 14 against the stepped portion 10, the upper piece 16 presses the chip 1 in the vertical direction. A single holding member exerts a uniform pressing action on the chip 1 due to the pressing action of the lower piece 18 in the front and back direction, thereby making it possible to press and fix the chip firmly and uniformly. Therefore, there is no need to worry about the chip breaking due to tightening, and there is an advantage that the accuracy of the chip is not strictly required. The embodiment shown in FIGS. 3 and 4 is another embodiment in which the obtuse angle inclination of the step wall 13 is used to form the rear end surface 25 of the presser member into an inclined surface having the same slope as the obtuse angle inclination of the step wall 13. This is intended to make the pressing force of the lower piece 18 stronger and more uniform. In addition, lower piece 1
8 and the upper surface of the stepped portion 10 is a leaf spring ring 26.
Or, if a compression coil spring is used, the tightening bolt 1
When 4 is loosened, the holding member 11 floats up, making it easy to replace the chip.

[Brief explanation of the drawing]

Figure 1 is a plan view of the main part of the proposed clamp bit.
FIG. 2 is a vertical cross-sectional view taken along the - line, FIG. 3 is a plan view of a main part of another embodiment, and FIG. 4 is a vertical cross-sectional view taken along the - line. 1...Tip, 3...Chip seat, 4...Fixing pin, 6...Bite holder, 7...Tip top surface,
10...Step part, 11...Press member, 13...Step wall, 14...Tightening bolt, 15...Claw part, 16...
...Top piece, 17...Front piece, 18...Bottom piece, 1
9... Gap part.

Claims (1)

[Scope of utility model registration request] A chip seat 3 that supports the chip 1, and the chip 1
A stepped portion 10 that accommodates a presser member 11 that presses against and holds the tool holder 6 is successively stepped from the tip of the tool holder 6 to the step wall 13 inclined at an obtuse angle toward the rear, and penetrates the tip 1. In the clamp tool in which the fixing pin 4 is installed in the tip seat 3, the holding member 11 is provided with an upper piece 16 that presses the upper surface 7 of the tip 1 with a claw portion 5 at the tip when in use, and a lower piece 18 is provided with The front part 17 comes into contact with the rear side of the chip so as to press it toward the center of the chip 1, and the upper part separates the gap part 19 from the chip 1 so that it can be opened and closed at a small angle in the vertical direction in the form of a fork at the rear part 22. A structure of a clamp bit, which is housed in the stepped part 10 with a gap in between, and in which both pieces 16, 18 and the gap 19 are communicated with each other, and a mounting bolt 14 is screwed into the stepped part 10.