Abrading – Frame or mount – Portable abrader
Reexamination Certificate
1999-03-12
2001-01-30
Rachuba, M. (Department: 3724)
Abrading
Frame or mount
Portable abrader
C451S514000, C451S515000, C451S508000
Reexamination Certificate
active
06179697
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a grindstone adapter which enables to remove and attach of a grindstone one-touch for use in electric tools and air tools such as a hand polisher, a disc grinder, and a disc sander etc. equipped with a grindstone having a small diameter (smaller than 125 mm, for example) and operated at low speed (a revolution speed smaller than 4,000 rpm, or a peripheral speed smaller than 1,000 m/min, for example).
A one-touch removable device which enables engaging/disengaging between a drive-side coupling (input boss) connected to a motor (reducer) output shaft for a hand polisher and a grindstone holder (grindstone pad etc.), has so far been proposed in various types (Japanese Unexamined Utility Model Publication No. 58-55845, No. 58-8562 & No. 62-8063). However, these devices are tools for holding their engaging states by utilizing a friction of engaging portions between a drive-side coupling and a grindstone holder or a friction of an elastic ring installed between the two, so that these devices offer a small holding force and are apt to be disengaged. Also, these devices are ready to be worn out due to vibration which will occur when transferring a torque, and still more apt to be disengaged due to looseness. Since a centering function for maintaining the grindstone holder at its center is weak, the device is more easily affected by the vibration from this aspect too and readily suffered from an abnormal wear of the grindstone and run-out of its center. Further, there has been such a trouble that the holder is disengaged when a torque is applied to it in a reverse direction.
BRIEF SUMMARY OF THE INVENTION
An object of this invention is to enhance the holding ability of the inserting portion of the drive-side coupling with the grindstone holder, to prevent disengagement between the two even when a torque is applied to them in either normal or reversed direction, to prevent wear and noise generated by torsional vibration etc. to keep a centering function stably for a long period, and to enable to remove and attach of the grindstone one-touch.
A first invention as set forth in claim
1
is a grindstone adapter, in which a drive force transmitted portion and plural stop portions are formed on a central boss of a disc-like pad secured to a grindstone disc or a grindstone, a drive portion fitting in the drive force transmitted portion and stop concave portions engaging with the stop projections are formed on a drive- side coupling fitting in the boss, and a depression cylinder which is urged by a spring toward a side for maintaining an engaging state between the stop projections and the stop concave portion is formed on the drive-side coupling.
A second invention as set forth in claim
2
is a grindstone adapter, in which the drive force transmitted portion and the plural stop portions are formed on an approximately same circle.
A third invention as set forth in claim
3
is a grindstone adapter, in which the grindstone disc is molded solidly with the disc-like pad.
A fourth invention as set forth in claim
4
is a grindstone adapter, in which the grindstone disc is provided with cooling water passages located at positions apart from its center.
REFERENCES:
patent: 524572 (1894-08-01), Beckert
patent: 927164 (1909-07-01), Puffer
patent: 1600054 (1926-09-01), MacLaughlin et al.
patent: 2290215 (1942-07-01), Stenberg
patent: 2671994 (1954-03-01), Hickman
patent: 2697878 (1954-12-01), Oberley
patent: 2840960 (1958-07-01), Booth
patent: 3376675 (1968-04-01), Hutchins
patent: 3436875 (1969-04-01), Cheney
patent: 3783729 (1974-01-01), Parr
patent: 3912411 (1975-10-01), Moffat
patent: 4809465 (1989-03-01), Mushardt et al.
patent: 4980994 (1991-01-01), Helm et al.
patent: 5688163 (1997-11-01), Siden
patent: 62-8063 (1962-01-01), None
patent: 58-8562 (1983-01-01), None
patent: 58-55845 (1983-04-01), None
Evenson, McKeown, Edwards & Lenahan P.L.L.C.
Rachuba M.
Sanwa Kenma Kogyo Co., Ltd.
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