Chucks or sockets – Socket type – Side detent
Reexamination Certificate
1999-11-10
2001-12-25
Bishop, Steven C. (Department: 3722)
Chucks or sockets
Socket type
Side detent
C279S091000, C279S103000, C403S342000, C403S374300
Reexamination Certificate
active
06332619
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
Chucks for use with power tools to interchangeably accept and hold tools, such as wood or other cutting tools, especially router bits, of simple, lightweight design, improving manufacturing and assembly techniques, but providing significant tool holding torque, are disclosed.
2. Discussion of the Related Art
Power tools to drive cutting, boring, and other tool elements are well known.
U.S. Pat. No. 5,096,212 to Joseph P. Walsh (the entire disclosure of which is herein incorporated by reference in its entirety) provided a significant advance in chucks suitable for use in coupling a power driven shaft to such tools, especially router bits. Such a chuck (illustrated in
FIG. 1
(PRIOR ART)) comprised a chuck body
11
, provided with an aperture
114
into which a collet
115
can be inserted.
The other end of aperture
114
was provided with means, such as internal threads
120
(
FIG. 2
(PRIOR ART)) for attachment to an electrically, pneumatically, hydraulically or other driven shaft. A collet
115
is insertable into aperture
114
and the shank
100
of cutting element
101
were secured in aperture
114
through the provision of a clamping mechanism extending through a bore
116
extending through aperture
114
. The clamping mechanism comprised two clamping elements
108
,
109
pulled together by means of a screw
110
. At least clamping element
108
was threaded
90
to accept the threads
94
of screw
110
such that upon tightening the threads, screw head
96
clamped elements
108
,
109
about collet
115
(or alternatively directly on the shaft
100
of cutting element
101
) to securely couple the cutting element
101
and the power driven shaft of the power tool.
Although a great advance over the prior art chucks, the Walsh invention had several drawbacks.
The provision of bore
116
to accommodate two clamping elements extending through aperture
114
made the size of the chuck body relatively large and bulky to accommodate the clamping elements. Still further, clamp elements
108
,
109
had to have alignment elements, such as keys and keyways
108
′,
109
′ to retain them in a desired orientation with regard to collet
115
, or shank
100
, of cutting element
101
.
The large size of the chuck exacerbated balancing as such chucks were used in routers known to revolve at speeds above 20,000 rpm (revolutions per minute).
Runout of the cutting element
101
became a problem as it was impossible to use threads
120
to simultaneously couple the chuck body
112
to the power driven shaft (not shown) while attempting to also align the respective centerline of the shank
100
and power driven shaft (not shown).
Another attempt at providing a chuck for a cutting tool is found in U.S. Pat. No. 5,348,319. In the device of that patent, a cam was provided which was pivotably mounted and activated by a set screw. However, the lever end of the cam, in conjunction with the set screw, could not generate sufficiently high holding power to withstand the forces tending to dislodge a cutting tool, especially a cutting tool rotating at high speed, such as in a router. To increase the length of the lever end of the cam would require enlarging the size of the chuck to accommodate the increased length, further tending to create a large and bulky mass, which, when subjected to high rotational speeds, would introduce additional problems which negates the proposed utility of the device as a chuck.
None of the attempts known to the inventor have been able to improve the requirements of a chuck for holding cutting, boring or other tools, and, especially, no one skilled in the art has provided an easy to use router chuck having acceptable torque for holding a cutting element without slippage while permitting ease of construction of the chuck.
SUMMARY OF THE INVENTION
It is an object of the present invention to improve the Walsh chuck to reduce the large and bulky nature of the chuck body while retaining the excellent collet (or shank) holding properties thereof.
It is a further object of the invention to provide a new manner in which the chuck body of the invention can be secured to a driven shaft of a power tool in which alignment of the centerlines of the drive shaft and cutting element remain in alignment while simultaneously providing secure retention of the chuck body to the drive shaft.
It is a still further object of the invention to provide a collet or shank clamping element positioned at or nearly tangentially to a collet or shank receiving bore in the chuck body which does not require keys (or keyways) to align the clamping element relative to the collet or shaft to be clamped.
It is another object of the invention to provide a chuck of such weight, size and bulk as not to exacerbate balancing even when rotating at speeds in excess of 20,000 rpm.
It is a still further object to provide a method of aligning and coupling two elements, e.g., shafts, a chuck and a shaft, and other similar elements by the use of an novel centering and retaining element.
REFERENCES:
patent: 1440207 (1922-12-01), Burns
patent: 3091474 (1963-05-01), Boutros et al.
patent: 5096212 (1992-03-01), Walsh
patent: 5348319 (1994-09-01), Stolzer
Bishop Steven C.
J. P. Walsh/J. P. Marmo Enterprises Inc.
Stevens Davis Miller & Mosher L.L.P.
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