Abrading – Frame or mount – Portable abrader
Reexamination Certificate
2002-03-12
2003-05-13
Nguyen, George (Department: 3723)
Abrading
Frame or mount
Portable abrader
C451S451000, C451S456000, C451S359000, C403S362000
Reexamination Certificate
active
06561887
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a protective cover detachably installed on a cutting machine/engraving machine combination, and more particularly to a protective cover which can be quickly, safely and conveniently installed and taken off from the main body according to the using state of the combination.
FIG. 6
shows a conventional cutting machine having a main body
8
in which a pneumatic motor (not shown) is installed. A rotary shaft
82
of the motor is coupled with a sand disk
83
for cutting off a work piece. The front end of the main body
8
is disposed with a thread section
84
. A nut
85
is screwed on the thread section
84
to tighten a protective cover
86
which partially covers the sand disk
83
. When cutting a work piece, the sand disk
83
may be broken and sparks will be produced so that the protective cover serves to protective a user from being hurt by the broken sand disk and prevent the sparks from affecting the sight of the user or burning the user. Therefore, it must be ensured that the protective cover is truly fixed without loosening. Otherwise, the safety in use of the cutting machine can be hardly ensured. When the sand disk
83
is replaced by a grinding stone
91
and relevant components, the cutting machine is changed into an engraving machine (as shown in FIG.
7
). However, when using the engraving machine, the protective cover
86
is unnecessary and is changed into a flat cover
92
so that the protective cover must be detached and removed. At this time, a user must untighten the nut
85
with a large wrench. Such operation is quite inconvenient for the user. Moreover, when untightening or tightening the nut
85
, due to the obstruction of the protective cover
86
(the protective cover
86
has small openings on two sides), each time the wrench can untighten or tighten the nut by a small angle so that such procedure is quite troublesome and time-consuming.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a protective cover detachably installed on a cutting machine/engraving machine combination. The protective cover is disposed with a fixing ring which can be directly tightened on an outer thread section of the main body. The gap of the split of the fixing ring can be changed by means of a tightening member so as to tightly engage the inner thread section of the fixing ring with the outer thread section of the main body without loosening. Therefore, the protective cover can be quickly and conveniently installed and taken off from the main body.
According to the above object, the combination includes:
a tubular main body, a motor being disposed in the main body, a switch being disposed on an outer side of the main body to control the rotation of the motor, the motor having a rotary shaft axially forward protruding out of the main body, a front end of the rotary shaft being fixed with a sand disk or a grinding stone, an outer thread section being disposed at the front end of the main body, the outer thread section can be alternatively fixed with a flat cover or a protective cover; and
a protective cover disposed at the front end of the main body to cover one half of the sand disk, a rear end of the protective cover having a fixing ring disposed on the outer thread section of the main body, the inner wall of the fixing ring is formed with an inner thread section cooperating with the outer thread section of the main body, the fixing ring being formed with a split, the fixing ring being disposed with a tightening member on two sides of the split. By means of tightening or untightening the tightening member, the gap of the split can be changed so as to tighten the fixing ring on the outer thread section of the main body.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 2429356 (1947-10-01), Hicks
patent: 3126021 (1964-03-01), May
patent: 3969856 (1976-07-01), Zerrer
patent: 4440045 (1984-04-01), Aksamit
patent: 4891915 (1990-01-01), Yasuda
patent: 5005321 (1991-04-01), Barth et al.
patent: 5031325 (1991-07-01), Walter et al.
patent: 5163252 (1992-11-01), Garner et al.
patent: 5411433 (1995-05-01), Keller
patent: 6210261 (2001-04-01), Johnson
patent: 36 38 337 (1988-05-01), None
patent: 39 40 584 (1991-06-01), None
Cho Chung Tsun
Lai Bao Shyan
Baxley Charles E.
Nguyen George
LandOfFree
Protective cover detachably installed on a cutting... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Protective cover detachably installed on a cutting..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Protective cover detachably installed on a cutting... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3044461