WO1992005906A1 - Hand-saws - Google Patents

Hand-saws Download PDF

Info

Publication number
WO1992005906A1
WO1992005906A1 PCT/GB1991/001688 GB9101688W WO9205906A1 WO 1992005906 A1 WO1992005906 A1 WO 1992005906A1 GB 9101688 W GB9101688 W GB 9101688W WO 9205906 A1 WO9205906 A1 WO 9205906A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
retainer
handle
slit
hand
Prior art date
Application number
PCT/GB1991/001688
Other languages
French (fr)
Inventor
Raymond Allenby Holmes
Original Assignee
Raymond Allenby Holmes
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Raymond Allenby Holmes filed Critical Raymond Allenby Holmes
Publication of WO1992005906A1 publication Critical patent/WO1992005906A1/en
Priority to GB9305353A priority Critical patent/GB2263251B/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D51/00—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends
    • B23D51/08—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends of devices for mounting straight saw blades or other tools
    • B23D51/10—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends of devices for mounting straight saw blades or other tools for hand-held or hand-operated devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D51/00—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends
    • B23D51/01—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends characterised by the handle

Definitions

  • This invention relates to hand-saws. It is concerned to allow the fitting of different blades to a given handle.
  • Saw blades may get damaged or blunted in use.
  • a carpenter may wish to operate with blades of different tooth-pitch or blades that have been serviced, e.g. by sharpening, or with different blades for cutting different materials.
  • part of the end of a saw blade is received in a slit in a handle and screws penetrate the handle and blade to be tightened into bosses engaging the handle to secure the handle and blades together.
  • the bosses may be on a common plate. No means for positioning the blade are provided apart from the screws or the bosses.
  • a saw blade is received in a recess on one face of a handle and is held there by a butterfly nut. Positioning of the blade in the recess is assisted by projections on the edges of the recess cooperating with notches in the edge of the saw blade.
  • the object of the present invention is to allow the user readily to substitute one blade for another in a saw, such as a carpenter's saw, having a pistol-grip type handle, the blade when in position being held rigidly and securely. Then the handle may be properly shaped and made so as to be comfortable and durable but blades are readily exchangeable e.g. for re-setting.
  • a hand-saw has a blade and a handle assembly, the handle assembly having a front plate and a back plate on opposing sides, the handle further having a slit into which one end of the blade fits, the blade then being held in a unique position by an interaction of positional means within the slit, this position aligning at least one hole in the blade with retainer receiving means of the plates, so that a retainer or retainers such as an Allen screw or screws can be passed from one plate to the other and tightened to secure the blade in place.
  • a retainer or retainers such as an Allen screw or screws
  • the retainer receiving means are at least one hole in one plate and a corresponding screw- threaded aperture or apertures on the other plate.
  • the handle preferably includes a storage receptacle for an Allen key.
  • the positional means are preferably projections adjacent an end-wall of the slit and corresponding notches in an end portion of the blade into which the projections will fit.
  • the projections may be pins passing across the slit.
  • the front and back plates may be detachable from the handle assembly and are preferably metal.
  • Fig. 1 is a side view of a handle and back end of a blade of a first embodiment
  • Fig. 2 is a top view of the handle;
  • Fig. 3a and 3b are respectively face and side views of a back plate;
  • Figs. 4a and 4b are respectively face and side views of a front. plate;
  • Fig. 5 is a side view of a handle and back end of a blade of a second embodiment
  • Fig. 6 is a top view of the handle of the second embodiment
  • Figs. 7a and 7b are respectively face and side views of a back plate of the second embodiment.
  • Figs. 8a and 8b are respectively face and side views of a front plate of the second embodiment. DESCRIPTION OF THE EMBODIMENTS SHOWN IN THE DRAWINGS
  • a saw handle 3 has a slit 12 into which fits one end of a blade 8 of a hand-saw.
  • Pins 6 pass through the handle 3 and project across the slit near its back wall 14 and are arranged so as to act as positional means by interacting with notches 10 in the back end 15 of the blade when it is pushed into the slit.
  • a back plate 2 has holes 13 through which retainers such as Allen screws 1 are to pass, while a front plate 7, which fits on the opposite side of the saw handle to the back plate, has corresponding lugs 11 with a screw-threaded socket to receive the screws. When the back end of the blade is pushed into the slit, the positioning pins can interact with the notches in the blade to thereby hold it in a unique position.
  • the front and back plates spread the load from the tightened screw across the faces of the handle to hold the blade in a strong grip.
  • the blade is kept rigidly in place, this rigidity providing the hand-saw with significant advantage over known arrangements.
  • the blade is prevented from rocking in the handle while the saw is in use by the interaction of the positioning pins with the notches in the blade.
  • a receptacle 4 enables an Allen key 5 to be kept in the top of the saw handle for convenience.
  • the plates equalize and spread the retaining grip exerted by the screws, and the blade is fully supported across its whole depth.
  • FIGS 5 to 8 show a second embodiment, in which only a single screw 1 passes between front and back pla 1 _3 2',7', through a single hole 9' in the blade. Other parts are as already described with reference to the first embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)

Abstract

A hand-saw has a blade (8) and a handle assembly which has a front plate (7) and a back plate (2) on opposing sides of a handle (3). An end portion (15) of the blade (8) fits into a slit (12) in the handle (3) and positional means (6, 10) of the blade (8) and handle (3) then interact to hold the blade (8) in a unique position. This position aligns a hole or holes (9) in the blade (8) with retainer-receiving means (11, 13) of the plates (2, 7) so that a retainer or retainers can be passed from one plate (2) to the other plate (7) and tightened to secure the blade (8) in place.

Description

HAND -SAWS
TECHNICAL FIELD
This invention relates to hand-saws. It is concerned to allow the fitting of different blades to a given handle.
BACKGROUND TO THE INVENTION
Saw blades may get damaged or blunted in use. Sometimes a carpenter may wish to operate with blades of different tooth-pitch or blades that have been serviced, e.g. by sharpening, or with different blades for cutting different materials. It has been known to have detachable and usually disposable blades in such objects as hack-saws, jig-saws and general purpose saws. In GB-A-310530 part of the end of a saw blade is received in a slit in a handle and screws penetrate the handle and blade to be tightened into bosses engaging the handle to secure the handle and blades together. On one face of the handle the bosses may be on a common plate. No means for positioning the blade are provided apart from the screws or the bosses.
In GB-A-966157 a saw blade is received in a recess on one face of a handle and is held there by a butterfly nut. Positioning of the blade in the recess is assisted by projections on the edges of the recess cooperating with notches in the edge of the saw blade. SUMMARY OF THE INVENTION
The object of the present invention is to allow the user readily to substitute one blade for another in a saw, such as a carpenter's saw, having a pistol-grip type handle, the blade when in position being held rigidly and securely. Then the handle may be properly shaped and made so as to be comfortable and durable but blades are readily exchangeable e.g. for re-setting.
According to the invention a hand-saw has a blade and a handle assembly, the handle assembly having a front plate and a back plate on opposing sides, the handle further having a slit into which one end of the blade fits, the blade then being held in a unique position by an interaction of positional means within the slit, this position aligning at least one hole in the blade with retainer receiving means of the plates, so that a retainer or retainers such as an Allen screw or screws can be passed from one plate to the other and tightened to secure the blade in place.
Preferably the retainer receiving means are at least one hole in one plate and a corresponding screw- threaded aperture or apertures on the other plate. When the retainer or retainers are Allen screws, the handle preferably includes a storage receptacle for an Allen key.
The positional means are preferably projections adjacent an end-wall of the slit and corresponding notches in an end portion of the blade into which the projections will fit. The projections may be pins passing across the slit. The front and back plates may be detachable from the handle assembly and are preferably metal. BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings: Fig. 1 is a side view of a handle and back end of a blade of a first embodiment;
Fig. 2 is a top view of the handle; Fig. 3a and 3b are respectively face and side views of a back plate; Figs. 4a and 4b are respectively face and side views of a front. plate;
Fig. 5 is a side view of a handle and back end of a blade of a second embodiment;
Fig. 6 is a top view of the handle of the second embodiment;
Figs. 7a and 7b are respectively face and side views of a back plate of the second embodiment; and
Figs. 8a and 8b are respectively face and side views of a front plate of the second embodiment. DESCRIPTION OF THE EMBODIMENTS SHOWN IN THE DRAWINGS
A saw handle 3 has a slit 12 into which fits one end of a blade 8 of a hand-saw. Pins 6 pass through the handle 3 and project across the slit near its back wall 14 and are arranged so as to act as positional means by interacting with notches 10 in the back end 15 of the blade when it is pushed into the slit. A back plate 2 has holes 13 through which retainers such as Allen screws 1 are to pass, while a front plate 7, which fits on the opposite side of the saw handle to the back plate, has corresponding lugs 11 with a screw-threaded socket to receive the screws. When the back end of the blade is pushed into the slit, the positioning pins can interact with the notches in the blade to thereby hold it in a unique position. Finding the interaction is assisted by the coincident shapes of the end of the blade and of the back wall 14 of the slit. In this position, holes 9 in the blade are aligned with holes in the back plate and in the saw handle and with the lug of the front plate, so screws 1 can be passed through and tightened to secure the blade in place.
The front and back plates spread the load from the tightened screw across the faces of the handle to hold the blade in a strong grip. The blade is kept rigidly in place, this rigidity providing the hand-saw with significant advantage over known arrangements. The use of steel Allen screws, which can be tightened harder than normal screws, further increases the security of the grip on the blade. The blade is prevented from rocking in the handle while the saw is in use by the interaction of the positioning pins with the notches in the blade. A receptacle 4 enables an Allen key 5 to be kept in the top of the saw handle for convenience. In this embodiment, the plates equalize and spread the retaining grip exerted by the screws, and the blade is fully supported across its whole depth.
Figures 5 to 8 show a second embodiment, in which only a single screw 1 passes between front and back pla1 _3 2',7', through a single hole 9' in the blade. Other parts are as already described with reference to the first embodiment.

Claims

CLAIMS :
1. A hand-saw comprising a blade (8) and a handle assembly, the blade having at least one hole (9) and an end portion (15) and the handle assembly having a handle (3) which has a slit (12) for receipt of the end portion (15) of the blade (8), and a plate which has retainer- receiving means (11,13) for receipt of at least one retainer (1) which can be passed through the hole or holes (9) to secure the blade (8) within the slit (12), characterized in that the handle (3) and blade (8) have positional means (6,10) distinct from the retainer-receiving means, for interaction within the slit (12), and the handle assembly has a front plate (7) and a back plate (2) on opposing sides of the handle (3), the retainer-receiving means (11,13) being on the plates (2,7), interaction of the positional means (6,10) within the slit (12) upon fitting of the end portion (15) of the blade (8) holding the blade (8) in a unique position, this position aligning the hole or holes (9) in the blade (8) with the retainer-receiving means (11,13) of the plates (2,7), so that the retainer or retainers (1) can be passed from one plate to the other and tightened to secure the blade (8) in place.
2. A hand-saw according to claim 1 wherein the slit (12) has an end wall (14) and the positional means (6,10) are projections (6) adjacent to the end wall (14) of the slit (12) and corresponding notches ( 10) in the end portion (15) of the blade (8).
3. A hand-saw according to claim 2 wherein the projections (6) are pins passing across the slit (12).
4. A hand-saw according to claim 1 wherein the retainer or retainers (1) is or are Allen screws.
5. A hand-saw according to claim 4 wherein the handle assembly has a storage receptacle (4) for an Allen key (5).
6. A hand-saw according to claim 1 wherein the retainer-receiving means (11,13) of the plates (2,7) comprises at least one hole in one plate corresponding in position with a screw-threaded socket or sockets on the other plate.
7. A blade adapted for use in a hand-saw according to claim 1 and having a hole or a plurality of holes to receive a retainer or retainers passing from one side of the blade to the other, and positional means distinct from the hole or holes.
8. A blade according to claim 7 having positional means which are two notches in the end portion of the blade and having one hole.
PCT/GB1991/001688 1990-10-01 1991-10-01 Hand-saws WO1992005906A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9305353A GB2263251B (en) 1990-10-01 1993-03-16 Hand-saws

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9021268.9 1990-10-01
GB909021268A GB9021268D0 (en) 1990-10-01 1990-10-01 Hand-saws

Publications (1)

Publication Number Publication Date
WO1992005906A1 true WO1992005906A1 (en) 1992-04-16

Family

ID=10683011

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/001688 WO1992005906A1 (en) 1990-10-01 1991-10-01 Hand-saws

Country Status (3)

Country Link
AU (1) AU8657991A (en)
GB (1) GB9021268D0 (en)
WO (1) WO1992005906A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995019863A1 (en) * 1994-01-25 1995-07-27 John Stanley Hand saw
AU698894B2 (en) * 1995-09-11 1998-11-12 Scies-Miniatures S.A. Saw blade holder

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1647396A (en) * 1925-06-25 1927-11-01 Black & Decker Mfg Co Rotary tool with key pocket
GB310530A (en) * 1928-04-28 1930-03-06 Clemson Brothers Inc Saw handles
US2321223A (en) * 1942-05-02 1943-06-08 Loughlin Alphonse Saw handle
WO1984001318A1 (en) * 1982-09-27 1984-04-12 Kohlbrat & Bunz Maschvertrieb Tool-holder
DE8536344U1 (en) * 1985-12-23 1986-05-07 Kaul, Gerd, 5657 Haan Wrench
DE3536101A1 (en) * 1985-10-09 1987-04-09 Horst Hefter Hand jigsaw

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1647396A (en) * 1925-06-25 1927-11-01 Black & Decker Mfg Co Rotary tool with key pocket
GB310530A (en) * 1928-04-28 1930-03-06 Clemson Brothers Inc Saw handles
US2321223A (en) * 1942-05-02 1943-06-08 Loughlin Alphonse Saw handle
WO1984001318A1 (en) * 1982-09-27 1984-04-12 Kohlbrat & Bunz Maschvertrieb Tool-holder
DE3536101A1 (en) * 1985-10-09 1987-04-09 Horst Hefter Hand jigsaw
DE8536344U1 (en) * 1985-12-23 1986-05-07 Kaul, Gerd, 5657 Haan Wrench

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995019863A1 (en) * 1994-01-25 1995-07-27 John Stanley Hand saw
AU698894B2 (en) * 1995-09-11 1998-11-12 Scies-Miniatures S.A. Saw blade holder

Also Published As

Publication number Publication date
AU8657991A (en) 1992-04-28
GB9021268D0 (en) 1990-11-14

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