CA2185305A1 - Curved blades for reciprocating saws - Google Patents
Curved blades for reciprocating sawsInfo
- Publication number
- CA2185305A1 CA2185305A1 CA 2185305 CA2185305A CA2185305A1 CA 2185305 A1 CA2185305 A1 CA 2185305A1 CA 2185305 CA2185305 CA 2185305 CA 2185305 A CA2185305 A CA 2185305A CA 2185305 A1 CA2185305 A1 CA 2185305A1
- Authority
- CA
- Canada
- Prior art keywords
- blade
- edge
- blades
- curve
- tooth
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
Links
Landscapes
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Abstract
The disclosure describes a saw blade having a shank adapted to fit into a reciprocating saw. The blade has one curved, toothed edge wherein the curve is on a 3 to 12-inch radius and the anterior edge of each tooth is sloped toward the shank of the blade at from 60° to 150°. The posterior edge of each tooth falls on or about on the radius of the curve of the toothed edge of the blade.
Description
2~85~05 PATENT APPLI CAT I ON
Field o~ ~he Invention:
This invention relates to saw blades for use in re~ip-rocating hand-manipulated saws.
Ba~kground of the In~e~tion-The use of reciprocating ~aws tha~ are hand manipulated has simplified ~he work o~ bo~h the profes~ional carpenter and the h~ndy ho~eowner. Such ~aws 2re po~ta~le an~ easily manipulated in m~ny work situations. However, most of the ~l~des on the market are not easily manipulated in situa-~ion~ wherein there is need to cut in~o a corner where the planes of two boards meet at a 90 angle. Furthermore, mo~t blades are not appropriate for ~tarting a c~t lying wholly in the pl~ne of the ma~erial. While there have previously been disclosed ~self-s~arting~ blades, most such blades are special purpose blades that a~e too fragile or spe~ialized for gener~l us~. Finally, ~any of the blades on the marke~
are ~de of ma~erial of such hardness ~hat they can not be sharpene~ with ~he files ~sually used by carpenters. For example, some of ~he blades on the marke~ are flame o~
electro har~ene~ ~o a~tain a hard~ess of ~bout ~0 to 6~ on the Rockwell s~ale. Since th~ is about the hardness of files, su~h blades are not readily sharpened during th~
course o~ use.
Thers have been bl~des previously disclosed ~s self-sta~ting having curved or non-parallel ~dges. Uni~ed Sta~es Pa~ent 3,680,610 to ~indgren d~scri~es a blade ~ith two cut~ing edge~ for plun~ng in~o a planar s~rfa~e. The blade ~as oppositely disposed ~ut~ing edges. ~niked States Patent 3,477,479 ~o Do~y describes a blade having a curved end to enable self-starting of the ~ut in a planar sur~c~. ~he non-~ut~ing edge is no~ par~llel ~o the axis of th~ blade.
~he bl~de ~s no~ useful for c~tting into co~ners where two planar surfaces meet a~ a 90~ angle.
U.S. Patent 5,113,70~ to Musgrove des~ribes ~nd ~l~ims a blade havirlg a ~oothed edg~ whe~ein at le~st 3 O~ of the 2 ~ ~5~i~5 too~hed edge is curved. The blades of the invent~on are impro~ed b~ m~nner in whic~ the teeth ar@ made ~hich pro~7ide a smoother ~u~ than ~he blades of the cited pa'cent ~o ~his in~entor.
De~lption of the ~ig~res:
Figure l shows a blade of the ~n~ention h~ving teet~
with the an~erior edge sloped toward the tang and the poste-rior edg~ falling about on the ra~iu3 of the curve o~ the blade.
~igure 2 (a) s~ow~ a blade wherein the teeth are al~er na~ely oppo~ing. Figure 2 (~) shows detail of the bl~de with the alterna~ely oppoæing inclination of the teeth Detailed D~scription o~ the Inven~ion:
It is the purpose of ~his invention ~o provide blades for use in recipro~ting saws that are useful fo~ self-starting auts in planar sur~aces. The blades of the inven-~lon are sufficiently strong for gene~al use in the bui~ding trad~s. Blades ~or us~ on ~ood ~e of ~pprcpriate hardness to allow for ~ha~pening with f~les usually used in the kuilding trade. The blades o~ the inven~ion h~ve a sh~n~
adapted to ~it into a re~ipro~a~ing S2~ ~nd an untoothed edge lying parallel to ~he longi~udinal axis of the bl~de and a taothed e~ge ~hioh is at least partially cur~ed. In a pre~erred e~bodime~t, the entire toothed portion is curYed.
This configuration is preferred because of ease in making of the blade. The bla~e i~ partic~larly useful for re~odeling work wherein i~ is neces~ary to ~ut one piece o~ lumber up to, but not into, a se~ond piece wi~h a surf~e lying per-pendicular ~o the plane of the first piece of lu~ber. The ~eeth tn ~ig. l a~e abou~ 5 to 8 to the inch on a blade for use in general Garpentry~ For use in ma~i~g fin~shin~ cuts or for use on finished surfaces a blade h~ing about 12 teeth to tho inch would be preferred. ~he -~h~nk po~ion has ~n offset or terminal portion and ~n ~pertur~ for mounting into a conventional recipro~ating sa~. The blade fo~ use on wood ln remodeling ls usually a~out .~5 to 2 inches de~p and a s 8 to 12 inohes long, whlle a blade fo~ use on ~netal ~nay be shallower and shorter.
A preferred e~nbodiment of the invention comprises a s~w blade ha~ting a shank ad~pted to fit into a reciprocal:ing saw, said bl~de having orle curve~, toothed ed~e wherein the curve is on a 3 to 12 inch radius a~d th~ anterior ed~e of ea~h too~h is sloped toward the back of the blade at f~om 60 ~ to 150 and the posterlor edge of each tooth falls on or about on the radius o~ the curve of said blade. The bl~des m~y have from 30 teeth per inch to 3 teeth per inch. ~he anterior ~dg~ of the tooth may be sloped several degrees varying from 60~ to 150 with varying sets oE ,o30~l t~
. 250" . ~he posterior edge of the tooth fall~ on or about on the radius of th~ curve of the blade. In a preferred 1~ embodi~ent, the teeth are alternately opposed wherein, when one look~ along th~ length of the blade one tooth bendæ to the ~igh~ of the blade and the next bend~ toward the left of the ~ ade, and ~herein the ~nterior edge o~ ~he blade slopes bac}c at about 150 l on the an'ce~ or ~dge. By shortening or lengthening the blade and c:hanging tooth configura~ion~ and the set, the blades may be particularly adapted for several uses. While the radius on which the curve of the blade ~nay be highly variable, for purposes of general ~arpe~ry and ~etal wo~k, the cunle is usually on a radius of from 3~ to 12". I:he mos~ us~ful blades for general remodeling work have a too~hed ~dge cut on a radius from 6 to 12 ir~ches.
~he blades for general remodeling work will usually }:e fro~n . 75 to 2 inches deep.
Bl~des of the invention are made with the teeth sloped tow~rd th~ tan~ cut only on the back stroke. Blades having a hardnes~ of ~0 to 4Z on ~he Rockwell scale are appropriate for cutting wood and are relatively easy to sharpen, For use in cutt~ng metals, a hardness ~f ~o to 65 on the Rock-well s~ale is preferred. For cutting metal, a cutting blade having 14 to 18 teeth per inch i~ prefe~red.
Referring to the FIG . 1, the blade ( 1; has a toothed edge (2) and an ~Intoothed edge (3). The anterior edge of 3 0 .S
~he tooth ~4) slopes toward the b~ck of the blade (on the ~ang~, whilst th~ posterior edge of the ~ovth (5) f~lls about on the radiu~ of the curve.
Blades of the invention are a thickness of about 0. 05 to o . 0~5 . About 5 . 5 to 22 teeth per inch are appropriate, depending on th~ purpose of ~h~ blade. ~or wood cu~ti~g a ~ ade ~ith less than 12 tee~h per inch is appropriate. ~o~
metal work, up to 22 teeth per inch is appropriate.
The blades are made using a ~ase me~al that ~as already been hardened before cut~ing, setting and grinding. A
pre~erted materi~l for the production o~ ~he blades is Q.l tool steel, To provide hardness o~ mo~ than 50 on ~h~
Rockwell s~le, the steel is quenched in oil at ~bo~t l~O~F, ~hen baked at about 400'F for on~ hour. I~ is understood, however, ~ha~ any mean~ known in the a~t of treating metal can be u~ed to attain appropriate hardne~.
~eferring ~o ~ig~re 2 ~a), the blade has ~ depth ~13 of about 1 inch. There is a shank (lO) with an aperture (14 ~ for purposes of fi~ing the ~lade into a recipro~ting saw. Th~ teet~ are alternately opposed with one tooth leaning forwatd from the plane o~ the blad~ ~12) and one ~eaning ba~kward ~rom the plane (ll) as depicted in t~e figu~e~, said teeth having an ante~ior e~ge slope backw~d (tang) to about 120. Figure 2 (b) gives ~nother ~rie~ which ~ore effectively shows the al~ernating opposing position of the teeth.
Field o~ ~he Invention:
This invention relates to saw blades for use in re~ip-rocating hand-manipulated saws.
Ba~kground of the In~e~tion-The use of reciprocating ~aws tha~ are hand manipulated has simplified ~he work o~ bo~h the profes~ional carpenter and the h~ndy ho~eowner. Such ~aws 2re po~ta~le an~ easily manipulated in m~ny work situations. However, most of the ~l~des on the market are not easily manipulated in situa-~ion~ wherein there is need to cut in~o a corner where the planes of two boards meet at a 90 angle. Furthermore, mo~t blades are not appropriate for ~tarting a c~t lying wholly in the pl~ne of the ma~erial. While there have previously been disclosed ~self-s~arting~ blades, most such blades are special purpose blades that a~e too fragile or spe~ialized for gener~l us~. Finally, ~any of the blades on the marke~
are ~de of ma~erial of such hardness ~hat they can not be sharpene~ with ~he files ~sually used by carpenters. For example, some of ~he blades on the marke~ are flame o~
electro har~ene~ ~o a~tain a hard~ess of ~bout ~0 to 6~ on the Rockwell s~ale. Since th~ is about the hardness of files, su~h blades are not readily sharpened during th~
course o~ use.
Thers have been bl~des previously disclosed ~s self-sta~ting having curved or non-parallel ~dges. Uni~ed Sta~es Pa~ent 3,680,610 to ~indgren d~scri~es a blade ~ith two cut~ing edge~ for plun~ng in~o a planar s~rfa~e. The blade ~as oppositely disposed ~ut~ing edges. ~niked States Patent 3,477,479 ~o Do~y describes a blade having a curved end to enable self-starting of the ~ut in a planar sur~c~. ~he non-~ut~ing edge is no~ par~llel ~o the axis of th~ blade.
~he bl~de ~s no~ useful for c~tting into co~ners where two planar surfaces meet a~ a 90~ angle.
U.S. Patent 5,113,70~ to Musgrove des~ribes ~nd ~l~ims a blade havirlg a ~oothed edg~ whe~ein at le~st 3 O~ of the 2 ~ ~5~i~5 too~hed edge is curved. The blades of the invent~on are impro~ed b~ m~nner in whic~ the teeth ar@ made ~hich pro~7ide a smoother ~u~ than ~he blades of the cited pa'cent ~o ~his in~entor.
De~lption of the ~ig~res:
Figure l shows a blade of the ~n~ention h~ving teet~
with the an~erior edge sloped toward the tang and the poste-rior edg~ falling about on the ra~iu3 of the curve o~ the blade.
~igure 2 (a) s~ow~ a blade wherein the teeth are al~er na~ely oppo~ing. Figure 2 (~) shows detail of the bl~de with the alterna~ely oppoæing inclination of the teeth Detailed D~scription o~ the Inven~ion:
It is the purpose of ~his invention ~o provide blades for use in recipro~ting saws that are useful fo~ self-starting auts in planar sur~aces. The blades of the inven-~lon are sufficiently strong for gene~al use in the bui~ding trad~s. Blades ~or us~ on ~ood ~e of ~pprcpriate hardness to allow for ~ha~pening with f~les usually used in the kuilding trade. The blades o~ the inven~ion h~ve a sh~n~
adapted to ~it into a re~ipro~a~ing S2~ ~nd an untoothed edge lying parallel to ~he longi~udinal axis of the bl~de and a taothed e~ge ~hioh is at least partially cur~ed. In a pre~erred e~bodime~t, the entire toothed portion is curYed.
This configuration is preferred because of ease in making of the blade. The bla~e i~ partic~larly useful for re~odeling work wherein i~ is neces~ary to ~ut one piece o~ lumber up to, but not into, a se~ond piece wi~h a surf~e lying per-pendicular ~o the plane of the first piece of lu~ber. The ~eeth tn ~ig. l a~e abou~ 5 to 8 to the inch on a blade for use in general Garpentry~ For use in ma~i~g fin~shin~ cuts or for use on finished surfaces a blade h~ing about 12 teeth to tho inch would be preferred. ~he -~h~nk po~ion has ~n offset or terminal portion and ~n ~pertur~ for mounting into a conventional recipro~ating sa~. The blade fo~ use on wood ln remodeling ls usually a~out .~5 to 2 inches de~p and a s 8 to 12 inohes long, whlle a blade fo~ use on ~netal ~nay be shallower and shorter.
A preferred e~nbodiment of the invention comprises a s~w blade ha~ting a shank ad~pted to fit into a reciprocal:ing saw, said bl~de having orle curve~, toothed ed~e wherein the curve is on a 3 to 12 inch radius a~d th~ anterior ed~e of ea~h too~h is sloped toward the back of the blade at f~om 60 ~ to 150 and the posterlor edge of each tooth falls on or about on the radius o~ the curve of said blade. The bl~des m~y have from 30 teeth per inch to 3 teeth per inch. ~he anterior ~dg~ of the tooth may be sloped several degrees varying from 60~ to 150 with varying sets oE ,o30~l t~
. 250" . ~he posterior edge of the tooth fall~ on or about on the radius of th~ curve of the blade. In a preferred 1~ embodi~ent, the teeth are alternately opposed wherein, when one look~ along th~ length of the blade one tooth bendæ to the ~igh~ of the blade and the next bend~ toward the left of the ~ ade, and ~herein the ~nterior edge o~ ~he blade slopes bac}c at about 150 l on the an'ce~ or ~dge. By shortening or lengthening the blade and c:hanging tooth configura~ion~ and the set, the blades may be particularly adapted for several uses. While the radius on which the curve of the blade ~nay be highly variable, for purposes of general ~arpe~ry and ~etal wo~k, the cunle is usually on a radius of from 3~ to 12". I:he mos~ us~ful blades for general remodeling work have a too~hed ~dge cut on a radius from 6 to 12 ir~ches.
~he blades for general remodeling work will usually }:e fro~n . 75 to 2 inches deep.
Bl~des of the invention are made with the teeth sloped tow~rd th~ tan~ cut only on the back stroke. Blades having a hardnes~ of ~0 to 4Z on ~he Rockwell scale are appropriate for cutting wood and are relatively easy to sharpen, For use in cutt~ng metals, a hardness ~f ~o to 65 on the Rock-well s~ale is preferred. For cutting metal, a cutting blade having 14 to 18 teeth per inch i~ prefe~red.
Referring to the FIG . 1, the blade ( 1; has a toothed edge (2) and an ~Intoothed edge (3). The anterior edge of 3 0 .S
~he tooth ~4) slopes toward the b~ck of the blade (on the ~ang~, whilst th~ posterior edge of the ~ovth (5) f~lls about on the radiu~ of the curve.
Blades of the invention are a thickness of about 0. 05 to o . 0~5 . About 5 . 5 to 22 teeth per inch are appropriate, depending on th~ purpose of ~h~ blade. ~or wood cu~ti~g a ~ ade ~ith less than 12 tee~h per inch is appropriate. ~o~
metal work, up to 22 teeth per inch is appropriate.
The blades are made using a ~ase me~al that ~as already been hardened before cut~ing, setting and grinding. A
pre~erted materi~l for the production o~ ~he blades is Q.l tool steel, To provide hardness o~ mo~ than 50 on ~h~
Rockwell s~le, the steel is quenched in oil at ~bo~t l~O~F, ~hen baked at about 400'F for on~ hour. I~ is understood, however, ~ha~ any mean~ known in the a~t of treating metal can be u~ed to attain appropriate hardne~.
~eferring ~o ~ig~re 2 ~a), the blade has ~ depth ~13 of about 1 inch. There is a shank (lO) with an aperture (14 ~ for purposes of fi~ing the ~lade into a recipro~ting saw. Th~ teet~ are alternately opposed with one tooth leaning forwatd from the plane o~ the blad~ ~12) and one ~eaning ba~kward ~rom the plane (ll) as depicted in t~e figu~e~, said teeth having an ante~ior e~ge slope backw~d (tang) to about 120. Figure 2 (b) gives ~nother ~rie~ which ~ore effectively shows the al~ernating opposing position of the teeth.
Claims (8)
1. A saw blade having a shank adapted to fit into a recip-rocating saw, said blade having one curved, toothed edge wherein said curve is on a 3 to 12 inch radius wherein the anterior edge of each tooth is sloped to-ward the shank of said blade at from 60° to 150° and the posterior edge of each said tooth falls on or about on the radius of the curve of said toothed edge of said blade.
2. A blade of claim 1 wherein the curve of the blade is on a 6-12 inch radius.
3. A blade of claim 2 wherein the anterior edge of each tooth is sloped toward the back of the blade at from 90° to 150°.
4. A blade of claim 2 wherein the blade is bout 1-2 inches deep.
5. A blade of claim 2 having a hardness of about 40 to 42 on the Rockwell scale.
6. A blade of claim 1 having a hardness of about 60 to 65 on the Rockwell scale.
7. A blade of claim 1 wherein the teeth are alternately opposed.
8. A blade of claim 1 which is 1-2 inches deep.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US354095P | 1995-09-11 | 1995-09-11 | |
| US60/003,540 | 1995-09-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2185305A1 true CA2185305A1 (en) | 1997-03-12 |
Family
ID=21706346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2185305 Abandoned CA2185305A1 (en) | 1995-09-11 | 1996-09-11 | Curved blades for reciprocating saws |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2185305A1 (en) |
-
1996
- 1996-09-11 CA CA 2185305 patent/CA2185305A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |
Effective date: 20000911 |