Cutlery – Cutting tools – Saw
Reexamination Certificate
2000-08-10
2001-11-20
Payer, Hwei-Siu (Department: 3724)
Cutlery
Cutting tools
Saw
C030S374000, C030S392000
Reexamination Certificate
active
06317988
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a saber saw or a reciprocating saw for cutting a workpiece such as woods, steel rods, and pipes etc. for building, remodeling and pulling down houses, equipment and buildings, and more particularly, to a shoe mechanism of the saber saw including a shoe to be pressed against the workpiece by an operator.
Conventionally in a saber saw shown in
FIG. 1
, a linear saw blade
5
is connected to a reciprocating shaft or a plunger (not shown) driven by an electric motor (not shown), so that the saw blade
5
is reciprocally moved for cutting a workpiece
10
. During cutting operation using the saber saw, reaction force is exerted in the reciprocating direction of the saw blade
5
. In order to withstand the reaction force, a shoe
3
is pushed onto a workpiece
10
as shown in
FIG. 1
during cutting operation to hold the entire device at a given position or posture. The shoe
3
is provided to a front end of a shoe support member or a post
2
attached to a main body
1
of the saber saw. The shoe
3
extends in a direction approximately perpendicular to the reciprocating direction. Further, the shoe
3
is pivotally movably supported to the post
2
by a pivot shaft
6
for facilitating a stable posture of the main body
1
relative to a workpiece
10
. The shoe
3
is formed with a vertical slot through which the saw blade
5
extends.
By pushing the shoe
3
onto the workpiece
10
, the positional relationship between the workpiece
10
and the saw blade
5
can be maintained constantly, and the reactive force generated in the reciprocating direction of the saw blade
5
can be received on the shoe
3
in order to enhance workability. Such arrangement is described in U.S. Pat. Nos. 5,007,172, 5,421,091 and 5,724,741.
However, in such conventional arrangement, the shoe
3
impacts or bumps on the workpiece
10
each time the saw blade
5
reciprocates to generate vibration and noise, which lower workability and increase operator's sense of fatigue.
Further, since the shoe
3
is pivotally supported to the post
2
, there may be a posture of the shoe
3
as shown in
FIG. 2
, where a portion of the shoe
3
lower than the pivot shaft
6
is in abutment with the workpiece
10
. In this case, a remaining portion of the shoe
3
higher than the pivot shaft
6
is inclined over the workpiece
10
. Thus, it would be difficult to observe the actual cutting position of the saw blade
5
, since the upper portion of the shoe
3
becomes an obstacle against the operator's view line. Incidentally,
FIG. 3
shows other angular posture of the shoe
3
in which a portion of the shoe
3
higher than the pivot shaft
6
is in abutment with the workpiece
10
. In the latter case, the actual cutting position is visible without any obstruction by the shoe
3
.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a saber saw capable of moderating reciprocating reaction force and providing a clear open space for facilitating observation of actual cutting position of the saw blade.
These and other objects of the present invention will be attained by an improved shoe mechanism of a saber saw, the saber saw including a main body having a front end, and a saw blade extending in a frontward/rearward direction of the main body and projecting from the front end of the main body. The saw blade is reciprocally movable in the frontward/rearward direction. The shoe mechanism includes a shoe support member, a pivot shaft, a shoe, and an urging member. The shoe support member is attached to the main body and extends in the frontward/rearward direction and projects from the front end of the main body. The pivot shaft is provided to the front end of the shoe support member. The shoe is pivotally supported to a front end of the shoe support member by the pivot shaft and has a front end surface abuttable on a workpiece. The shoe has an upper portion above the pivot shaft and a lower portion below the pivot shaft. The urging member is provided in association with the shoe support member and the shoe for urging the upper portion of the shoe toward the main body. Thus the urging member provides a clear open space for allowing the operator to easily observe the actual cutting position, because the upper portion of the shoe is positioned away from the operator's view line. Further, the urging member can serve as a damper for moderating vibration imparted on the shoe. Thus, the operator can easily hold the main body.
REFERENCES:
patent: 2998830 (1961-09-01), Atkinson
patent: 5007172 (1991-04-01), Palm
patent: 5134777 (1992-08-01), Meyer et al.
patent: 5421091 (1995-06-01), Gerritsen et al.
patent: 5724741 (1998-03-01), Bednar
patent: 5855070 (1999-01-01), Grabowski
patent: 6234255 (2001-05-01), Feldmann et al.
patent: 6249979 (2001-06-01), Bednar et al.
Osada Yoshio
Tachibana Toshihiko
Hitachi Koki Co,. Ltd.
Payer Hwei-Siu
Sughrue Mion Zinn Macpeak & Seas, PLLC
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