GB2360735A

GB2360735A - Hacksaw frame with arcuate support rod

Info

Publication number: GB2360735A
Application number: GB0103064A
Authority: GB
Inventors: Kun-Meng Lin
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-02-15
Filing date: 2001-02-07
Publication date: 2001-10-03
Anticipated expiration: 2021-02-07
Also published as: GB0103064D0; CN2461731Y; JP3079584U; FR2804896A3; GB2360735B; FR2804896B3

Abstract

A hacksaw comprises a frame 20, a handle 21, an end piece 23, and a blade 1. An arcuate support rod 22 is located between the handle and the end piece, such that either end of the arcuate support rod has fixing surfaces that interengage with fixing surfaces on the handle and the end piece. This arrangement may enable the arcuate support rod to be locked in any one of a plurality of rotational positions. The fixing surfaces may comprise an arrangement of interlocking protrusions and recesses, which may shaped so as to prevent rotation.

Description

2360735 FRAME OF HACKSAW

FIELD OF THE INVENTION

The present invention relates generally to a hacksaw, and more particularly to a frame of the hacksaw.

BACKGROUND OF THE INVENTION

As shown in FIGS. 1, a hacksaw 10 of the prior art comprises a handle 11, a frame 12, and a blade 1. The frame 12 is of an inverted U-shaped construction and is provided with two parallel arms 13 and 14 between which the blade 1 is held.

The prior art hacksaw 10 is defective in design in that it can not be easily maneuvered or even used in a limited space because of the shape of the frame 12.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a hacksaw which is free from the deficiency of the prior art hacksaw described above.

In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by a hacksaw comprising a handle, a curved support rod, an end piece, and a blade. The curved support rod is fastened at one end thereof with the handle and at other end thereof with the end piece. The blade is held between the handle and the end piece.

The foregoing objective, features and functions of the present 1 invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the embodiments of the present invention with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a schematic plan view of a hacksaw of the prior art.

FIG. 2 shows a perspective view of a hacksaw of the first preferred embodiment of the present invention.

FIG. 3 shows an exploded view of the hacksaw of the first preferred embodiment of the present invention.

FIG. 4 shows a perspective view of the hacksaw of the first preferred embodiment of the present invention.

FIG. 5 shows a schematic view of the hacksaw of the first preferred embodiment of the present invention in use.

FIG. 6 shows a perspective view of a hacksaw of the second preferred embodiment of the present invention.

FIG. 7 shows a schematic view of the hacksaw of the second preferred embodiment of the present invention in use.

FIG. 8 shows a top view of the hacksaw of the second preferred embodiment of the present invention in use.

FIG. 9 shows an exploded view of a hacksaw of the third preferred embodiment of the present invention.

FIG. 10 shows a sectional view of a hacksaw of the fourth preferred embodiment of the present invention.

FIG. 11 shows a sectional view of a hacksaw of the fifth 2 preferred embodiment of the present invention.

FIG. 12 shows an exploded view of a hacksaw of the sixth preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

As shown in FIGS. 2-5, a hacksaw embodied in the present invention comprises a frame 20, a handle 21, and a blade 1.

The frame 20 has an arcuate support rod 22, which is provided at one end thereof with a protrusion 221 and a plurality of recesses 223, and at other end thereof with a protrusion 222 and a plurality of recesses 224.

The handle 21 has a top cross rod 211 which is provided with a receiving slot 212 and a plurality of projections 213. The arcuate support rod 22 is fastened at one end thereof with the top cross rod 211 of the handle 21 such that the protrusion 221 of the arcuate support rod 22 is received in the receiving slot 212 of the handle 21, and that the recesses 223 of the arcuate support rod 22 receive the projections 213 of the handle 21. The handle 21 is provided with a fastening member 30 which is opposite in location to the top cross rod 211 and is used to fasten one end of the blade 1.

An end piece 23 is fastened with other end of the arcuate support rod 22 and is provided with a slot 231 which receives the protrusion 222 of the arcuate support rod 22, and with a plurality of projections 232 which are received in the recesses 224 of the arcuate support rod 22. The end piece 23 is provided with a locating member 40 for locating other end of the blade 1.

3 As shown in FIGS - 68, the arcuate support rod 22 of the present i nvention has a 90-degree curvature to result in a substantial decrease in height of the front end of the hacksaw of the present invention, so as to facilitate the operating of the hacksaw in a place where there is 6nly a little room for maneuvering the hacksaw.

As shown in FIGS. 9 and 10, the arcuate support rod 22 is provided with two protrusions 50 and 51, which are retained respectively in the recesses 60 and 61 of the handle 21 and the end piece 23. The protrusions 50, 51 and the recesses 60 and 61 may have a polygonal cross section, as shown in FIG. 11.

As shown in FIG. 12, the fastening ends of the arcuate support rod 22, the top cross rod 211 of the handle 21, and the end piece 23 are provided with a threaded surface 70.

The embodiments of the present invention described above are to be regarded in all respects as being merely illustrative and not restrictive. Accordingly, the present invention may be embodied in other specific forms without deviating from the spirit thereof. The present invention is therefore to be limited only by the scopes of the following appended claims.

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Claims

1. A hacksaw comprising:

a frame having an arcuate support rod which is provided at one end thereof with a protrusion and a plurality of recesses, and at the other end thereof with a protrusion and a plurality of recesses; a handle having a top cross rod which is provided with a receiving opening and a projection and is fastened at one end thereof with said arcuate support rod such that said receiving opening of said top cross rod receives said protrusion of said arcuate support rod, and that said projection of said handle is received in one of said recesses of said arcuate support rod, said handle provided with a fastening member opposite in location to said top cross rod for fastening one end of a blade; and an end piece fastened with the other end of said arcuate support rod and is provided with an opening for receiving said protrusion of said arcuate support rod, said end piece further provided with a projection whereby said projection is received in one of the said recesses of said arcuate support rod, said end piece further being provided with a locating member for locating the other end of said blade.

2. A hacksaw as claimed in claim 1, wherein said arcuate support rod has a 90-degree curvature.

3. A hacksaw as claimed in claim 1 or 2, wherein said arcuate support rod is provided with two protrusions whereby said two protrusions are respectively received in recesses of said handle and said end piece.

4. A hacksaw as claimed in any one of the preceding claims, wherein said protrusions and said recesses have a polygonal cross section.

5. A hacksaw as claimed in any one of the preceding claims, wherein the fastening ends of said arcuate support rod, said top cross rod of said handle, and said end piece are provided with a threaded surface.

6. A hacksaw as claimed in any one of the preceding claims, in which the top cross rod and the end piece are each provided with a plurality of projections, which engage in respective openings formed in the arcuate support rod.

7. A hacksaw as claimed in any one of the preceding claims, in which there are at least twice as many recesses in each end of the arcuate support rod as there are projections on either the top cross rod or the end piece.

8. A hacksaw comprising a handle, and an end piece, the handle and end piece being spaced apart by an arcuate support rod and supporting between them a blade, a first end of the arcuate support rod comprising a first fixing surface, a second end of the arcuate support rod comprising a second fixing surface, the portion of the handle which abuts the arcuate support rod comprising at third fixing surface and the portion of the end piece which abuts the arcuate support rod comprising a fourth fixing surface, the first fixing surface and the third fixing surface and the second fixing surface and the fourth fixing surface being provided is with interengaging elements which are adapted to lock the arcuate support rod in any one of a plurality of rotational positions relative to the handle and the end piece.

9. A hacksaw as claimed in claim 8, in which the interengaging elements comprise a protrusion on one of the said fixing surfaces and an opening in the abutting fixing surface, the protrusion being received in the opening.

10. A hacksaw as claimed in claim 9, in which the protrusion and opening are shaped to prevent rotation of the protrusion relative to the opening when the protrusion is received in the opening.

11. A hacksaw as claimed in claim 9 or 10, in which the interengaging elements further comprise a projection on one of the said fixing surfaces and a plurality of recesses formed in the abutting fixing surface, the projection and recesses being positioned away from the centre of the respective fixing surfaces on which they are located.

12. A hacksaw substantially as described herein, with reference to and as shown in the accompanying drawings.

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