Chucks or sockets – Expanding – Collet type
Reexamination Certificate
2001-11-05
2003-01-07
Wellington, A. L. (Department: 3722)
Chucks or sockets
Expanding
Collet type
C279S156000, C409S141000, C082S153000, C082S165000
Reexamination Certificate
active
06502834
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a holding chuck for a tire-wheel which is equipped with a chatter-suppressing device.
2. Description of the Related Art
When an automobile tire-wheel is machined, the tire-wheel is clamped by a holding chuck, at the center thereof, and mounted on a metal-cutting machine tool. A tire-wheel generally has a relatively large diameter and is fabricated using relatively thin metal plates. Further, when the outer circumference of the tire-wheel is machined, the tire-wheel is gripped at the center thereof by a holding chuck and rotated around its center axis. In this condition, an undesirable chattering (vibration) occurs at the outer circumference of the tire-wheel (i.e., at a rim of the tire-wheel) during machining.
In order to suppress this undesirable chattering, usually, a suppressing device which supports the rim of the tire-wheel during the machining is used.
FIGS. 8 and 9
show a holding chuck for a tire-wheel equipped with a conventional suppressing device.
In
FIGS. 8 and 9
, reference numeral
51
designates a chuck body of a holding chuck for a tire-wheel. The chuck body
51
is provided with a clamp
53
and stopper face
52
. When a tire-wheel W is mounted on the chuck body
51
, the stopper face
52
abuts the center disk portion of the tire-wheel W, as shown in
FIG. 8
, and positions the tire-wheel in the direction parallel to the center axis of the chuck body. When the tire-wheel W is placed on the stopper face
52
, the clamp
53
is inserted into a center hole H of the tire-wheel w and grips the same so that the tire-wheel W is aligned to the center axis of the chuck body.
Numeral
54
in
FIGS. 8 and 9
designates a chatter-suppressing damper. As shown in the drawings, a plurality of dampers
54
are fitted to a rim of a holding ring
55
at regular intervals. The holding ring
55
is detachably attached to the chuck body
51
by bolts
56
. Each of the chatter-suppressing dampers includes a damping rod
58
which is urged by a spring
54
toward the tire-wheel and abuts the rim of a tire-wheel in order to prevent the chattering of the rim of the tire-wheel.
However, in the conventional holding chuck, it is necessary to replace the holding ring
55
with one having a different diameter when the size of the tire-wheel to be mounted on the chuck is changed. In other words, different sets of the holding ring
55
and the dampers
54
, each matching the tire-wheel of different size, must be prepared and stored. Since the height of the holding ring is relatively large as can be seen from FIG.
8
and the shape thereof is not flat, it is difficult to stack the holding rings in the storage. Thus, the number of the holding rings to be stored and the shapes thereof make the handling of the holding rings inconvenient.
Further, the width of the rim of the tire-wheel changes in accordance with the size (the diameter) of the tire-wheel. In the conventional holding chuck, since the damping rod
58
of the chatter-suppressing damper
54
is urged to the rim of the tire-wheel by the spring
57
, the urging force of the spring
57
changes as the width of the rim of the tire-wheel (i.e., the stroke of the damping rod
58
) changes. Thus, when the width of the rim is small, the damping rods
58
are pressed against the rim end E (
FIG. 8
) with insufficient force. In some cases this results in insufficient chatter-suppressing.
SUMMARY OF THE INVENTION
In view of the problems in the related art as set forth above, the objects of the present invention are to provide a holding chuck for a tire-wheel equipped with a chatter-suppressing device which is capable of suppressing the chattering of the tire-wheels of different size without requiring replacement of the holding ring or dampers.
The object as set forth above is achieved by a holding chuck for a tire-wheel with a chatter-suppressing device, according to the present invention, comprising a clamping device inserted into a center hole of a tire-wheel for clamping and holding the wheel in the position aligning a center axis of a holding chuck, a plurality of chatter-suppressing dampers disposed on a plurality of circles concentric with the center axis of the holding chuck, each of the chatter-suppressing dampers being provided with a damping rod extending in the direction parallel to the center axis of the chuck and abutting a rim of the wheel and a damper cover disposed between the rim of the wheel and the chatter-suppressing dampers and fastened to the holding chuck, the damper cover being provided with holes disposed on a circle concentric with the center axis of the chuck and allowing the damping rods of the dampers disposed on only one of the concentric circles matching the concentric circle of the damper cover to extend therethrough and abut the rim of the wheel.
According to the present invention, chatter-suppressing dampers are disposed on the circles concentric with the center axis of the holding chuck. The diameters of the respective circles correspond to the diameters of the tire-wheels of different sizes. Further, although damping rods of all chatter-suppressing dampers are urged towards the rim of the tire-wheel mounted on the holding chuck, the damper cover allows the damping rods of the chatter-suppressing dampers disposed on only one of the concentric circles to pass through the holes of the damper cover and abut the rim of the tire-wheel, i.e., only the damping rod of the chatter-suppressing damper disposed on the circle, the diameter of which matches the size of the tire-wheel mounted on the chuck, are allowed to extend and abut the rim of the tire-wheel. Other damping rods are blocked by the damper cover and do not extend.
Therefore, when the size of the tire-wheel is changed, only the damper cover is required to be replaced with one having a circle of holes matching the size of the tire-wheel. In other words, it is not required to replace the holding ring and chatter-suppressing dampers when the size of the tire-wheel is changed.
The chatter-suppressing damper may be provided with a pneumatic cylinder to extend the damping rod. By urging the damping rod toward the rim of the tire-wheel by air pressure, a uniform force for pressing the damping rod against the rim end of the tire-wheel can be obtained regardless of the size of the tire-wheel and the width of the rim thereof. Thus, a sufficient chatter-suppressing can be obtained regardless of the size of the tire-wheel.
REFERENCES:
patent: 1691657 (1928-11-01), Kempton et al.
patent: 3044791 (1962-07-01), Nicosia et al.
patent: 3131946 (1964-05-01), Newhouser
patent: 3323808 (1967-06-01), Newhouser
patent: 3420538 (1969-01-01), Benjamin et al.
patent: 5464233 (1995-11-01), Hanai
patent: 5562007 (1996-10-01), Seymour
patent: 6126174 (2000-10-01), Reece et al.
patent: 6-262409 (1994-09-01), None
patent: 10-309611 (1998-11-01), None
patent: 2001-198713 (2001-07-01), None
Fukui Katsumi
Imai Akihiko
Tuzuki Hiromasa
Ueda Hirokazu
Bleasdell Don J
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Howa Machinery Ltd.
Wellington A. L.
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