Chuck device

Details Chuck device Chuck device

2001-04-16

2002-11-05

Passaniti, Sebastiano (Department: 3711)

Chucks or sockets

Socket type

Obliquely guided reciprocating jaws

C279S902000

Reexamination Certificate

active

06474657

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a chuck device wherein a nut has threads for engagement with teeth of clamp members, and a groove for receiving balls therein so that the nut is rotated smoothly.
BACKGROUND OF THE INVENTION
A conventional chuck device for clamping a tool such as a bit is shown in FIG.
5
and generally includes a tube
10
with inclined holes defined therethrough and the holes communicate with a central passage of the tube
10
. Each of the holes has a clamping member
11
movably received therein and each clamping member
11
has teeth
12
defined in a periphery thereof. A nut
13
is mounted to the tube
10
and has threads defined in an inner periphery thereof, the threads of the nut
13
are engaged with the teeth
12
of each of the clamping members
11
. A bearing
14
is located between the nut
13
and a flange of the tube
10
, so that the nut
13
can be rotated smoothly. A sleeve
15
is mounted to the nut
13
and the tube
10
, the sleeve
15
is co-rotatably connected to the nut
13
so that when rotating the sleeve
15
, the nut
13
is rotated to move the clamping members
11
. However, because the nut
13
is cooperated with the bearing
14
, the manufacturers have to prepare bearings
14
besides the nuts
13
, the tubes
10
, the clamping members
11
and the sleeves
15
. The bearings
14
make the cost of manufacture of the chuck on a high level. Besides, the assembly for the bearing
14
and the nut
13
requires skilled persons and takes a lot of time. A tolerance between the bearing
14
and the nut
13
will affect the friction between these two parts and could generate noise.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a chuck device and comprises a tube having a central passage and a plurality of inclined holes which communicate with the central passage. A plurality of recesses are defined in an outer surface of the tube and communicate with the inclined holes. A plurality of clamping members are respectively inserted in the inclined holes and each clamping member has teeth defined in an outside thereof. The teeth are accessed in the recesses. A nut is mounted to the tube and has threads defined in an inner periphery thereof. The threads are engaged with the teeth of the clamping If members. A groove is defined in the inner periphery of the nut so as to receive balls therein which are positioned by a pressing ring. An engaging groove is defined in the inner periphery of the nut and a C-shaped clamp is engaged with the engaging groove so as to position the pressing ring.
The primary object of the present invention is to provide a chuck device wherein the bearing is make with the nut as a one-piece member.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, two preferred embodiments in accordance with the present invention.


REFERENCES:
patent: 897335 (1908-09-01), Almond
patent: 1417981 (1922-05-01), Englund
patent: 1476903 (1923-12-01), McConnell
patent: 2292470 (1942-08-01), Ostberg
patent: 3807745 (1974-04-01), Bent
patent: 5348318 (1994-09-01), Steadings
patent: 5531139 (1996-07-01), Fanchang
patent: 6010135 (2000-01-01), Miles
patent: 6398226 (2002-06-01), Huggins

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