Cutlery – Cutting tools – Saw
Reexamination Certificate
2001-08-22
2002-08-20
Payer, Hwei-Siu (Department: 3724)
Cutlery
Cutting tools
Saw
C030S514000, C030S151000
Reexamination Certificate
active
06434838
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to a protective sheath for saw teeth of a handsaw. The protective sheath has a better attractively fixing effect. The protective sheath is applicable to different kinds of handsaws with various patterns of handles. In addition, the protective sheath also serves as a ruler.
FIG. 1
shows a conventional hand saw
10
including a saw blade
11
and a handle
12
. The bottom edge of the saw blade
11
is formed with a row of saw teeth
111
. In working, a wooden work piece
91
is first marked with a line
95
by a ruler (not shown) and then sawed by the hand saw
10
.
The saw teeth
111
are very sharp and are likely to injure people. In order to avoid unexpected injury of people prior to use (during transferring or exhibition) or after use (in storage), two conventional measures are available as follows:
1. As shown in
FIG. 2
, a paper sheath
92
having an interior space
921
is used to receive the saw blade
11
of the hand saw
10
.
2. As shown in
FIG. 3
, a plastic clip envelope
93
has a bottom wall
932
and a pair of clipping walls
931
integrally upward extending from the bottom wall
932
. The saw blade
11
can be fitted between the clipping walls
931
and clamped thereby. Accordingly, the saw teeth
111
are enclosed in the clip envelope
93
without exposed to outer side.
In actual use, the sheath
92
of
FIG. 1
is paper-made and is subject to thrust of the saw teeth
111
or softening and damage due to oil or water. Once the sheath
92
is broken, it cannot provide any protective function and a user's hand or body is very possible to be cut by the saw teeth
111
.
With respect to the second measure, the clip envelope is able to resiliently clamp and fix the saw blade
11
. However, it is difficult to fit the saw blade into the clip envelope and the clipping force thereof is often insufficient. The gap between the top edges of the clipping walls
931
must be smaller than the thickness of the saw blade
11
for achieving a better clipping force. However, when fitting the saw blade
11
into the clip envelope, the top edges of the clipping walls
931
will scrape the saw blade
11
. Furthermore, after a period of use, the clipping force will be declined and the saw blade is easy to detach from the clip envelope.
In addition, when marking the wooden work piece
91
, it is necessary to additionally prepare a ruler. In the case that no ruler is available (or the user forgot to bring it), it will be hard to precisely mark the work piece with a line
95
. This makes it difficult to accurately saw the work piece.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a protective sheath for saw teeth of a handsaw. The protective sheath includes multiple magnetic members for achieving better attractively fixing effect.
It is a further object of the present invention to provide the above protective sheath in which the rear end of the base section is formed with a recess to which different patterns of handles are adaptable.
It is a further object of the present invention to provide the above protective sheath which also serves as a ruler.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 757740 (1904-04-01), Happe
patent: 1803463 (1931-05-01), Danielson
patent: 2439568 (1948-04-01), Hall
patent: 2792163 (1957-05-01), Kidwell
patent: 2853106 (1958-09-01), Kanthack
patent: 4942663 (1990-07-01), Ray, Sr.
patent: 5011102 (1991-04-01), Kiefer
patent: D383961 (1997-09-01), Scales, III
patent: 6076261 (2000-06-01), Eriksson et al.
Payer Hwei-Siu
Rosenberg , Klein & Lee
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