JPS6225314Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cutting tool attachment device that facilitates the attachment and detachment of cutting tools such as broaches.

Conventionally, the first
As shown in the figure, a long hole 2 with a round through hole 21 on one side and a stepped bolt mounting seat 5 on the other side is drilled in the cutting part 1 of the cutting tool T in the direction in which the cutting tool T is shifted as described later. , pass the elongated hole through the bolt 4 that has been screwed into the holding base 3 in advance, shift the cutting tool in the direction of arrow A in Figure 2, and then screw the bolt 4 toward the bolt mounting seat 5, and follow the imaginary line in Figure 1 A. The cutter T was fastened to the holding base 3 by pressing the head 41 of the bolt shown by the bolt onto the bolt mounting seat 5. Further, after slightly loosening the bolt 4, the cutting tool was moved in the direction of arrow B in FIG. 2, and the cutting tool was removed from the holding base 3 through the elongated hole 2. Therefore, each time the cutting tool is removed, the cutting tool can be attached and removed without removing each bolt, so that the cutting tool can be replaced extremely quickly and easily.

However, chips generated during cutting enter the through hole 21 and cause a blockage, so even if an attempt is made to loosen the bolt 4 and remove the cutter T from the holder 3, the chips interfere with the cutter and prevent the cutter from moving. Before removal, the chips must be removed first. The work was complicated.

This invention relates to a cutting tool mounting device that solves the above problems by attaching a blocking cover to the elongated hole to prevent chips from entering, and also covering and fixing a blocking cover with holes for bolt tightening near the bolt mounting seat. Now, an embodiment will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a long hole 2 is bored in the cutting tool T in the direction of shifting the cutting tool. The long hole has a third
It has the same shape as the elongated hole 2 as shown in Figure A, and extends from the cutting part 1 of the cutting tool to the bolt mounting seat 5 as shown in Figure 3B.
A guide surface 8 is formed along the curved wall surface 7 of the long hole leading to the hole, and the guide surface of the closing cover 6 covering the head 41 of the bolt 4 is press-fitted along the curved wall surface of the long hole and fixed. A bolt tightening hole 9 is formed in the closing cover 6 near the bolt mounting seat 5, and after attaching the closing cover 6 to the long hole 2, the cutting tool T is moved in the direction of arrow A in FIG. The bolt 4 screwed into the holding base 3 is tightened through the bolt tightening hole 9 using a wrench (not shown). When the head of the bolt comes into contact with the bolt mounting seat 5, the cutting tool T is fixed to the holding base 3. In addition, the height h of the guide surface 8 of the closing cover 6 is made slightly higher than the thickness D of the bolt head 41, so that the bolt head does not interfere with the closing cover, and the two are placed as close as possible. There is.

To remove the cutter T, insert a wrench through the bolt tightening hole 9, loosen the bolt 4 slightly, and then shift the cutter T in the direction of arrow B.

Incidentally, reference numeral 10 is a chamfer made on the end face of the elongated hole 2, which allows for good guidance when inserting the cutting tool T.

In this invention, as described above, the blocking cover 6 is fixed to the long hole 2 of the cutter, and the blocking cover is provided with holes for bolt tightening near the bolt mounting seats, and the bottom of the cover and the bolt head are brought close to each other. Intrusion into the elongated hole is reliably prevented, and no clogging of chips occurs. Moreover, since the bolt can be tightened or loosened from the bolt tightening hole without removing the blocking cover, the cutting tool can be attached and detached extremely easily and quickly. This frees them from the troublesome work of removing chips.

[Brief explanation of drawings]

FIG. 1A is a partial front view of a conventional cutting tool, FIG. 2B is a side view of the same portion, FIG. B is a cross-sectional view taken along the E-line in the same figure.
The figure is a cross-sectional view of this invention. 1... Cutting part, 2... Long hole, 4... Bolt, 5
... Bolt mounting seat, 6... Blocking cover, 7... Curved wall surface of long hole, 8... Guide surface of blocking cover, 9...
...Bolt tightening hole, 41...Bolt head, T...
...cutting tool, D...thickness of the bolt head, h...height of the guide surface of the blocking cover.

Claims (1)

[Scope of utility model registration request] A long hole is formed in the cutting part of the cutting tool in the direction in which the cutting tool is shifted, and a step-shaped bolt mounting seat is provided on one side of the long hole, and a bolt tightening hole is bored near the bolt mounting seat, and a bolt tightening hole is formed in the vicinity of the bolt mounting seat. The guide surface of a closing cover provided with a guide surface along the curved wall surface of the long hole is press-fitted and fixed along the curved wall surface of the long hole, the long hole is covered with the closing cover, and the height of the guide surface is A cutting tool mounting device characterized in that the thickness of the bolt is slightly larger than the thickness of the bolt head.