JPS5848006Y2 - drill chuck - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a drill chuck.

Conventionally, the first drill chuck for portable electric drills, etc.
There is something like the one shown in the figure.

That is, the rotating shaft 2 protrudes from the tip of the electric drill body 1.
Then, the chuck body 3 is fixed with a screw or taper, etc., a water hole 4 is formed in the chuck body 3, a claw 5 is provided in the water hole 4 so as to be able to move forward and backward, and a ring 6 is provided around the outer periphery of the chuck body 3. A female threaded ring 6a, which is rotatably provided and fixed to the ring 6, is screwed into a male threaded portion 5a formed on the claw 5, and the claw 5 is moved forward and backward through the female threaded ring 6a by rotating the ring 6 forward and backward. There is.

However, in this case, since the chuck body 3 is fixed to the rotating shaft 2 protruding from the electric drill body 1, the length of the protrusion from the distal end surface of the electric drill body 1 to the tip of the claw 5 is relatively long.

Further, the rear end of the water hole 4 is formed in the main body 3 and the ring 6 so that the rear end reaches the position where the claw 5 retreats, and the diameter of the rear part of the water hole 4 is made the same as the maximum diameter of the claw 5. Therefore, the overall length of the chuck body 3 becomes relatively long and the outer diameter R also becomes large.

Therefore, when used in a portable electric drill, there is a drawback that operation in a narrow space is inconvenient or impossible.

The present invention solves the above-mentioned drawbacks by focusing on the fact that the male threaded portion 5a of the claw 5 is cut by an amount d from the outer diameter 5b of the tip of the claw, as shown in FIG. The purpose is to

Next, an embodiment of the present invention shown in FIGS. 2 to 5 will be described.

7 is a chuck body, and a bearing 7a is integrally provided on the rear surface of the chuck body.

Further, inside the body of the chuck body 7, three water holes 8 having a circular cross section are formed at equal intervals in the circumferential direction and widening at the rear with respect to the axial direction.

A hole 5 similar to that described above is housed in each water hole 8 so as to be movable forward and backward.

A cover ring 9 is rotatably fitted around the outer periphery of the chuck body 7, and a gear 9a for rotating the cover ring is carved on the front surface of the cover ring.

A female threaded ring 10 is fixed to the inner periphery of the cover ring, and a female thread formed on the inner surface of the female threaded ring 10 is screwed into the male threaded portion 5a of the pawl 5.

As shown in FIG. 5, the male threaded portion 5a of the claw 5 is formed into an arc that matches the arc of the female thread of the female threaded ring 10 at a position where an amount d is removed from the outer diameter 5b of the sliding portion of the claw. .

11 is a bearing ring fitted on the outer peripheral surface of the chuck body 7, and the inner diameter of this bearing ring 11 (outer diameter of the chuck body 7)
is set to have a small diameter so as to be as close to the axis of the chuck body I as possible without interfering with the retraction of the male threaded portion 5a of the claw 5.

That is, the male threaded portion 5a of the claw 5 is d smaller than the outer diameter of the tip of the claw 5.
Since the bearing ring 11, through which only the male threaded portion 5a passes, does not require the space of the maximum diameter of the claw 5, the rear part of the water hole 8 Even if the outer periphery of the chuck body 7 is formed to have a small diameter by cutting off the upper surface, the operation of the claws 5 will not be hindered in any way.

The rear inner surface of the bearing ring 11 has a tapered surface 11 that widens at the rear so that the male threaded portion 5a of the pawl 5 can pass through.
a is formed.

As described above, in use, the shaft portion 7a and the bearing ring 11 are fitted and fixed in the tip portion of the electric drill body 12 by appropriate means as shown in FIG.

Then, fit the well-known rotating handle into the hole 13 and gear 9.
By rotating the cover ring 9 forward and backward through a,
The ring 10 is rotated in forward and reverse directions, and the claws 5 move forward and backward by the engagement of the female thread and the male thread 5a.

Therefore, the claws 5 are opened by retreating and closed by moving forward, so that a tool can be attached and removed between the claws.

Furthermore, even when the pawl 5 is retracted, its rear part is attached to the bearing ring 11.
There is nothing wrong with its operation since it never hits the object.

As described above, in the present invention, the outer diameter of the rear part of the chuck body 7 is formed as small as possible to a position that does not interfere with the retraction of the male threaded portion 5a of the claw 5, and the outer diameter of the outer circumference of the chuck body In addition to fitting the bearing ring 11, a tapered surface 11a that widens at the rear is formed at the rear part of the inner circumference, so that the bearing ring 11 has a small diameter, reduces the circumferential speed during rotation, and reduces the tip of the drill body 12. Reduce the outer diameter.

Moreover, since the bearing 7a is integrally provided on the rear surface of the chuck body 7 and is fitted and fixed into the tip of the electric drill body, etc., the protrusion from the tip surface of the electric drill body 7 to the tip of the claw 5 The length t is shorter than that of conventional products.

Since the outside diameter r and the protrusion length t are small in this way, if this drill chuck is used in a portable electric drill, it can be easily worked in a narrow place.

[Brief explanation of the drawing]

Fig. 1 is a side view cut away from the top half showing a conventional drill chuck, Fig. 2 is a side view cut away from the top half showing an actual case of the present invention, Fig. 3 is a rear view, and Fig. 4 is a front view. Figure 5 A, B
are side and rear views of the nail. 5... Claw, 5a... Male thread portion, 7... Chuck body, 7a... Bearing, 8... Water hole, 11... Bearing ring, 11a... Tapered surface.

Claims (1)

[Scope of utility model registration request] A plurality of water holes are formed in the chuck body 7 so as to be inclined so that the rear side is farther away from the axis, and a pawl 5 is provided in the water hole so as to be movable forward and backward, and the pawl 5 is driven forward and backward. The external threaded portion 5a of the claw 5 is carved closer to the axis of the claw than the outer diameter of the sliding portion of the claw, so that the rear outer peripheral diameter of the chuck body 7 does not interfere with the retraction of the male threaded portion 5a of the claw 5. In addition, a bearing ring 11 is fitted onto the outer circumferential portion of the chuck body 7, and the inner circumferential rear portion of the bearing ring 11 is formed into a tapered surface 11a that widens at the rear. A drill chuck further characterized in that a bearing 7a is integrally protruded from the rear axis of the chuck body 7.