JPS62255004A - Clamped tool - Google Patents

Abstract

PURPOSE:To firmly secure a chip to a chip seat surface and a stepped part, by engaging a projection at the front end of a retainer in a through-hole at the center of the chip, by holding the rear end of the retainer against a holder so that it may not be rotatable, and by inclining a clamp bolt at an obtuse angle with respect to the chip seat surface. CONSTITUTION:A projection 6 at the front end part 3a of a retainer 3 covers over and engages in a through-hole 11 formed in a chip 1, and the rear end part of the retainer 3 is extended to an inclined part 10 in the rear part of a tool holder 2 and is made into contact with the same, being held thereto unrotatably. Further, a clamp bolt 5 is inclined at an obtuse angle with respect to the chip seat surface, and the retainer 3 not only presses the chip from above a sheet plate 4 but pulls the same toward a stepped wall in the tool holder 2 so that the chip is pressed and secured against the stepped wall. Accordingly, it is possible to restrain the clamp bolt and the retainer 3 from being worn, thereby the chip may be stably secured.

Description

[Detailed Description of the Invention] Industrial Application Field 2 The present invention is a clamp tool in which a knob is mechanically fixed to a holder using a screw, wedge, presser foot, etc., in which each corner of a polygonal tip is sequentially used. This is about slow-moving bites.

Prior art: As a conventional clamp bit of this type, one disclosed in Japanese Patent Publication No. 58244/1983 is known. That is, as shown in the attached FIGS. 5 and 6, the head of a tightening bolt 5 whose lower part is tapered is attached to the holder 6 for fixing the chip 1 to the holder 2. Press the convergent conical surface formed on the inner circumferential surface of the presser foot's entire through hole to eccentrically move the presser foot together with the tip toward the rear of the tool holder, and press the tip against the holding surface of the holder and at the same time press it against the tip seat. The means for fixing it is described.

Problems to be solved by the invention: Conventionally, this type of use was used to pull the presser foot backwards and press it, which placed a large load on a portion of both tapers, which caused a lot of wear and tear on the bolt, and also caused the presser foot to become damaged. There was a problem in that if cutting chips or dirt got into a part of the gold taper, this mechanism would not work as effectively as expected.

Means for Solving the Problems: The present invention satisfies the requirements for this type of clamp bit and aims to eliminate the above problems.

A step wall is provided at the tip of the tool holder to form a chip seat.
Fix the security deposit here and attach the chip on top of it. A presser foot is installed in the shape of a bridge from the top of the tip to the rear tool holder, and this is tightened and fixed to the tool holder using a clamp bolt. The protrusion is engaged with the protrusion, and the rear end is supported so as not to rotate relative to the tool holder. For example, it may be formed into a hollow cylindrical leg with a non-circular cross section such as an ellipse and fitted into the recess 14 on the upper surface of the holder, or if it has a circular cross section, a keyway may be formed to prevent rotation. The axis of this hollow cylindrical leg forms a part of the clamp bolt through hole, and the axis of the crank bolt is not perpendicular to the bottom surface of the chip seat as in the conventional case, but forms an obtuse angle with respect to the end of the presser. A through hole is formed to pass through the tool holder, and it is convenient that the crank bolt has a reverse thread configuration so that it is screwed into the presser foot with a left-hand thread, and screwed into the tool holder with a right-hand thread. In the case of normal bolts, a known washer is used. When the rear end of the presser foot is formed into a hollow leg as described above, the hollow leg also coaxially forms a part of the through hole. The through hole may be configured to penetrate through the upper and lower surfaces of the holder.

Example: To explain the example in detail with reference to FIGS. 1 and 2, a step wall 7.8 is provided at the tip of the tool holder 2, and the tip seat 12 is
is formed parallel to one side of the tool holder. The deposit 4 is fixed here with screws 13, and the chip 1 is inserted. A through hole 11 is formed in the center of the tip 1, and a protrusion 6 is provided on the lower surface of the tip 1 to cover and engage with the front end portion of the presser foot 3. The rear end of the presser foot 3 is formed into a hollow cylindrical leg 16. The rear end of the presser foot 3 is preferably formed into a ring shape so as not to damage the chip. 5 has an inclination of 90° + 15f1, and forms a through hole 15 that is coaxially screwed into the rear end of the presser foot 30 and the tool holder 2.The screw hole of the hollow leg is a right-handed screw connection. A hexagonal hole for an L-shaped wrench is provided on each end face.

Effects and effects: To fix the tip 1 to the tool holder 2, screw the clamp bolt 5 into the screw hole of the tool holder 2 once or twice, and when the crank bolt is stabilized, place the presser foot 3 on the top surface of the clamp bolt 5. When the button is rotated clockwise using the L-shaped presser punch, the tool holder 2 and the presser foot 3 will approach each other because they have a reverse screw configuration. When the tip 1 is brought close to the predetermined distance in this way, insert the tip 1 between the presser foot 3 and the tip seat 12, and further rotate the clamp bolt 5 clockwise, the presser foot 3 will be lowered and the entire bottom surface of the presser foot will be The protrusion 6 of the chip 1 is engaged with the through hole 11 of the chip 1. Since the axis of the anti-reclining bolt 5 is inclined at an obtuse angle to the chip seating surface, the chip 1 can be pulled in so as to be pressed against the chip seating wall surface, that is, the surfaces of the stepped walls 7 and 8, and simultaneously clamped from above. Chip 1 that can
When removing the chip from the chip seat 12, tighten the crank bolt 5.
Just rotate it counterclockwise. If there is a hexagonal wrench hole on both sides, the rotation of the clan debo/l/) can be done using the tool holder 2.
It can also be done from the back side.

In the embodiment shown in FIG. 4, the front end 8a of the presser foot 3 squeezes and engages the tip through hole 11, and the rear end 3b extends to the inclined part 10 at the rear of the pipe holder, comes into contact with it, and is supported unrotatably. Ru. In this case, the clamp bolt (tk) 5 may be a normal button head button instead of a Doug μ screw.

By configuring the clamp port axis of the present invention to be inclined at an obtuse angle with respect to the chip seating surface, it is possible not only to clamp the chip from above, but also to reliably press and fix the chip to the first wall of the tool holder. Clampbo/I/
) has been solved. Since the entire front end portion covers and engages the tip through hole, there is no drawback of dirt or chips getting inside.

Also, with the 1 cm 7 jl lever lock holder, the drawback that the cutting edge of the tip would lift up and become chipped was also resolved.

[Brief explanation of drawings]

Fig. 1 is a plan view of the main part of the clamp bit of the present invention, Fig. 2 is a vertical sectional view thereof, Fig. 3 is a sectional view of the main part of another embodiment, and Fig. 4 is a plan view thereof. It is. Fifth. FIG. 6 is a sectional view and an exploded perspective view of essential parts of a conventional clamp bit.

Claims (3)

[Claims] (1) In a throw-away type clamp tool, in which a step wall is provided at the tip of the tool holder to form a chip seat, and the mounted chip is tightened and fixed to the tool holder with a clamp bolt from above via a presser foot, the presser foot The front end of the metal covers and engages the through hole in the center of the tip, and the rear end supports the tool holder so as not to rotate, and the clamp bolt has a through hole that should support it. A clamp bit, characterized in that a through hole is formed through the presser foot and the bit holder so that the axis of the hole forms an obtuse angle with the tip seating surface. (2) The rear end of the presser foot is non-rotatably supported in a recess on the upper surface of the tool holder as a hollow leg with a non-circular cross section coaxial with the clamp tool. clamp bite. (2) The clamp bit according to claim 1 or 2, wherein the clamp bolt has threaded portions at both ends having opposite threads. (3) The clamp tool according to claim 1 or 3, wherein the rear end of the presser foot is unrotatably supported by an inclined surface of the tool holder.