Clutch mechanism

Details Clutch mechanism Clutch mechanism

1999-04-19

2002-08-27

Shoap, Allan N. (Department: 3724)

Cutting

Means to drive or to guide tool

With transmission yieldable on overload

C083S666000, C030S388000

Reexamination Certificate

active

06439091

ABSTRACT:

FIELD OF THE INVENTION
This invention relates generally to clutch mechanisms for tools.
BACKGROUND OF THE INVENTION
Referring to
FIG. 1
, a circular saw blade
10
is normally driven by a rotating arbor
20
operatively connected to a motor (not shown) of a power tool. In many applications, the blade
10
has a circular hole
11
through the center for acceptance of the arbor
20
. The arbor
20
may often have a smaller diameter mounting portion
21
which extends from a larger primary portion of the drive arbor to form a shoulder
22
. The blade
10
is typically placed over the smaller diameter mounting portion
21
until it is stopped against the shoulder
22
formed by the main drive portion of the arbor
20
. The blade
10
is then locked on to the arbor by clamping it between the shoulder
22
and either a threaded locking nut
23
which is threaded onto the end of the small diameter mounting portion
21
(see, e.g., U.S. Pat. Nos. 5,477,845 and 5,303,688) or a bolt threaded into a threaded hole in the end of the arbor (see, e.g., U.S. Pat. No. 5,303,688). Sometimes, a blade clamp
24
may be disposed between the blade
10
and the shoulder
22
. Similarly, a second blade clamp
25
and/or a washer
46
may be disposed between blade
10
and nut
23
. The blade
10
then rotates with the arbor
20
because of the clamping force.
Sometimes because of the clamping force, the blade
10
may stop rotational movement of arbor
20
when blade
10
gets caught by a workpiece. Such lack of movement may damage the motor or gears connecting the motor to arbor
20
.
SUMMARY OF THE INVENTION
In accordance with the present invention, an improved power tool is employed. A power tool includes a motor, an arbor driven by the motor, a rotatable cutting tool disposed on the arbor and having a rotational axis, the cutting tool further having a hole, first and second clamps connected to the arbor and clamping the blade, wherein one of the cutting tool and at least one of the first and second clamps and arbor have a first drive surface for contacting a second drive surface on the other of the cutting tool and the at least one of the first and second clamps and arbor, the second drive surface being movable between a first position contacting the first drive surface and a second position bypassing the first drive surface. The second drive surface is resiliently connected to the other of the cutting tool and the at least one of the first and second clamps and arbor. At least one metal strip connects the second drive surface to the other of the blade and the at least one of the first and second clamps and arbor.
Additional features and benefits of the present invention are described, and will be apparent from, the accompanying drawings and the detailed description below.


REFERENCES:
patent: 1518634 (1924-12-01), Cason, Jr.
patent: 1548427 (1925-08-01), Aldeen
patent: 1865559 (1932-07-01), De Montgrand
patent: 2028441 (1936-01-01), Decker
patent: 2256496 (1941-09-01), Robinson
patent: 2491976 (1949-12-01), Hauser
patent: 2519848 (1950-08-01), Osterdahl
patent: 2572042 (1951-10-01), Martin
patent: 2637987 (1953-05-01), Hill et al.
patent: 2729038 (1956-01-01), Hutchins
patent: 2803103 (1957-08-01), Kollman
patent: 2978858 (1961-04-01), Moody
patent: 3561543 (1971-02-01), Ulbing
patent: 3596446 (1971-08-01), Bryan
patent: 3774379 (1973-11-01), Mizobata et al.
patent: 4053980 (1977-10-01), Poehlman
patent: 4205572 (1980-06-01), Weiner
patent: 4343214 (1982-08-01), Schadlich
patent: 4480736 (1984-11-01), Loizeau
patent: 4766641 (1988-08-01), Daglow
patent: 4941790 (1990-07-01), Kirn
patent: 4991473 (1991-02-01), Gotman
patent: 5000721 (1991-03-01), Williams
patent: 5060772 (1991-10-01), Anders et al.
patent: 5099970 (1992-03-01), Harris
patent: 5293798 (1994-03-01), Otani et al.
patent: 5566458 (1996-10-01), Bednar
patent: 5667347 (1997-09-01), Matthews
patent: 5707275 (1998-01-01), Preis et al.
patent: 5810533 (1998-09-01), Nakamura
patent: 5871322 (1999-02-01), Nakamura

Affiliated with

Also associated with

Rating

Clutch mechanism does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Clutch mechanism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clutch mechanism will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2900454