CA1295836C - Saw sharpening apparatus - Google Patents
Saw sharpening apparatusInfo
- Publication number
- CA1295836C CA1295836C CA000534775A CA534775A CA1295836C CA 1295836 C CA1295836 C CA 1295836C CA 000534775 A CA000534775 A CA 000534775A CA 534775 A CA534775 A CA 534775A CA 1295836 C CA1295836 C CA 1295836C
- Authority
- CA
- Canada
- Prior art keywords
- saw blade
- saw
- sharpened
- grinding drum
- 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.)
- Expired - Lifetime
Links
Landscapes
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
ABSTRACT
A hand-held, motor driven apparatus for sharpening saw blades wherein a small grinding drum having its axis transverse to the saw blade provides a hollow ground sharpening action and the body of the apparatus extends over each side of the grinding drum to shield each side of the grinding site to thereby provide optimum safety for the operator.
A hand-held, motor driven apparatus for sharpening saw blades wherein a small grinding drum having its axis transverse to the saw blade provides a hollow ground sharpening action and the body of the apparatus extends over each side of the grinding drum to shield each side of the grinding site to thereby provide optimum safety for the operator.
Description
1~5836 BACKGROUND_OF THE INVENTION
i This invention relates to 8 hand-held, motor driven apparatus for shaepening saw blades, particularly large circular saw bladeo having replaceable teeth as used in commercial lu~ber cutting operations.
While similar saw blade sharpeners can be found in the prior art, there have been no significant advances therein in 40 years. United States Patent Numbers 2,249,743; 2,439,279; 2,651,219 and 3,880,019 each i relate to hand-held, motor driven saw blade sharpeners. Of these sharpeners, the one disclosed in U.S. Patent Number 2,249,743 is the only one which is readlly available and commonly used in the industry today. While this saw blade sharpener will perform the ~ob intended, there are several disadvantages with this apparatus as well as the : ~ : : : .
others disclosed in the prior art. ~or example, all these sharpeners utilize solid grin~ing wheels,~ which require frequent dressing and are costly to replace. It is also known that solid grinding wheels will frscture in use on some occasions creatlng a significant hazard due to the flylng~ grinding whee1 pleces. In addition, it can be seen from the discl~osures ln the above cited patents that none are provided ~ith any means for shielding the~operator from the sparks ~nd particles e~itted 1 Pawlosky ~: .
~' .. . .
:
1;2~5~3~
from manual grinding operations, let alone from fractured grinding wheel fragments.
It can further be seen that most of the sharpeners disclosed in ~he above-cited patents utilize flat grinding sur~aces that grind the saw blade tooth in a direction transverse to the cutting direction of the saw tooth. On the other hand, the sharpening apparatus as described below provides a much preferred hollow ground sharpening action as described in U.S. Patent No. 2,651,219. It is well known that a ho:Llow ground sharpening actionl which provides a concave grind perpendicularly awsy from the saw tooth cutting edge, is far superior.
This is so not only because the sharpened tooth need not be dressed to remove burrs and wire edges, but also because the so sharpened saw blade itself is superior not only in providing a better cut, but less energy is required to make a comparable cut. In addition, the hollow ground sharpening action can be effected at a higher RPM having less tendency to burn the saw tooth metal.
In addition to the above there are other disadvantages in the prior art sharpeners as will become apparent when contrasted to the saw blade sharpe=er of this invention as described below.
SU~RY OF TH~ INVENTION
This invention relates to a new and improved hand-held, motor driven apparatus for sharpening saw blades which overcomes the ha~ards and disadvantages of prior art sharpeners. Accordingly, an object of this 2 Pawlosky invention is to provide a saw-blade sharpening apparatus which is not only safer to operate, but is also si~pler to operate. In ~ddition the sharpener of this invention provides a desirable hollow ground sharpening action, utilizes an inexpensi~e grinding ~leeve which never needs dressing, is of simple design and low cost fabrication, and is readily adjustable to be utilized on saw blades of differing size and design.
, BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a cross-sectional end view of a saw sharpening apparatus according to this invention properly positioned on a circular saw blade.
Fig. 2 is a fragmentary cross-sectional illustration of the preferred method of securing grinding sleeve to the ~otor arbor.
Fig. 3 is a fragmentary, cross-sectional end view of the apparatus shown in Fig. 1 illustrating a locating guide which serves to properly position and center the apparatus over the saw blade for proper sharpening.
Fig~.~4 is a side~view~of the apparatus shown in Pig. 1 properly positioned over a circular saw~blade.
i This invention relates to 8 hand-held, motor driven apparatus for shaepening saw blades, particularly large circular saw bladeo having replaceable teeth as used in commercial lu~ber cutting operations.
While similar saw blade sharpeners can be found in the prior art, there have been no significant advances therein in 40 years. United States Patent Numbers 2,249,743; 2,439,279; 2,651,219 and 3,880,019 each i relate to hand-held, motor driven saw blade sharpeners. Of these sharpeners, the one disclosed in U.S. Patent Number 2,249,743 is the only one which is readlly available and commonly used in the industry today. While this saw blade sharpener will perform the ~ob intended, there are several disadvantages with this apparatus as well as the : ~ : : : .
others disclosed in the prior art. ~or example, all these sharpeners utilize solid grin~ing wheels,~ which require frequent dressing and are costly to replace. It is also known that solid grinding wheels will frscture in use on some occasions creatlng a significant hazard due to the flylng~ grinding whee1 pleces. In addition, it can be seen from the discl~osures ln the above cited patents that none are provided ~ith any means for shielding the~operator from the sparks ~nd particles e~itted 1 Pawlosky ~: .
~' .. . .
:
1;2~5~3~
from manual grinding operations, let alone from fractured grinding wheel fragments.
It can further be seen that most of the sharpeners disclosed in ~he above-cited patents utilize flat grinding sur~aces that grind the saw blade tooth in a direction transverse to the cutting direction of the saw tooth. On the other hand, the sharpening apparatus as described below provides a much preferred hollow ground sharpening action as described in U.S. Patent No. 2,651,219. It is well known that a ho:Llow ground sharpening actionl which provides a concave grind perpendicularly awsy from the saw tooth cutting edge, is far superior.
This is so not only because the sharpened tooth need not be dressed to remove burrs and wire edges, but also because the so sharpened saw blade itself is superior not only in providing a better cut, but less energy is required to make a comparable cut. In addition, the hollow ground sharpening action can be effected at a higher RPM having less tendency to burn the saw tooth metal.
In addition to the above there are other disadvantages in the prior art sharpeners as will become apparent when contrasted to the saw blade sharpe=er of this invention as described below.
SU~RY OF TH~ INVENTION
This invention relates to a new and improved hand-held, motor driven apparatus for sharpening saw blades which overcomes the ha~ards and disadvantages of prior art sharpeners. Accordingly, an object of this 2 Pawlosky invention is to provide a saw-blade sharpening apparatus which is not only safer to operate, but is also si~pler to operate. In ~ddition the sharpener of this invention provides a desirable hollow ground sharpening action, utilizes an inexpensi~e grinding ~leeve which never needs dressing, is of simple design and low cost fabrication, and is readily adjustable to be utilized on saw blades of differing size and design.
, BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a cross-sectional end view of a saw sharpening apparatus according to this invention properly positioned on a circular saw blade.
Fig. 2 is a fragmentary cross-sectional illustration of the preferred method of securing grinding sleeve to the ~otor arbor.
Fig. 3 is a fragmentary, cross-sectional end view of the apparatus shown in Fig. 1 illustrating a locating guide which serves to properly position and center the apparatus over the saw blade for proper sharpening.
Fig~.~4 is a side~view~of the apparatus shown in Pig. 1 properly positioned over a circular saw~blade.
3 Pawlosky , .
',,: ' ' ' . ' ~2~336 DESCRIPTION OF T~E I~VENTION
In essence, the broadest aspect of this invsntion comprises a body member having a slotted opening partially therethrough uch that the body member will straddle a saw blade in a saddle back manner, and h ving a motor att~ched thereto which rotates a grinding drum located entirely within the sl~tted opening with its axis transverse to tho opening. Referring to the drawings, the preferred embodimant of this invention as illustrated comprises two simllar side plat~s 5 and 6 ad~ustably secured to a centar plate 7 by bolts 17, such that plates 5 and 6 extend beyond one edge of plate 7 and such ~hat the ~lotted opening is formed betwsen Qnd plates 5 and 6. The holes in'center plate 7 through which bolts 17 pass are vertically elongated 80 that ',~
center plate 7 can be adjusted upwart or d,ownward vith respect to end plates 5 and 6. Side plate 6~has a small motor 21 attached thereto , .
such that the motor shaft 22 extends transver~ely through side plate 6 and into the space provit,ed between plate~ 5 and 6. A cylindrical grindin~ trum is axially secured over the motor shaft 22 and is contained entirely within the open~ng between plates 5 and 6 such that said plates S ant~6 provlde ~ shi21d on each side of the grind1ng~drum.
A preferred e~bodiment of the grinding drum is i11ustrated in ~i~. 2 and cDnsists of an expandable rubber d~um 8 which is snugly fitted over arbor 26. Arbor 26~is~aLially keyed to the motor shaft 22~ and an abraslve sleeve:9 Lnugly fitted over~rubber drum 8. The ~nd of the arbor 26 iL threaded to receive n~t 10 which can be tiBhtened s~inst washer 23 and rubber drum 8 causing rubber drum 8 to expsnd radially against, and thus~tightly secure,~abrading sleeve 9.
',,: ' ' ' . ' ~2~336 DESCRIPTION OF T~E I~VENTION
In essence, the broadest aspect of this invsntion comprises a body member having a slotted opening partially therethrough uch that the body member will straddle a saw blade in a saddle back manner, and h ving a motor att~ched thereto which rotates a grinding drum located entirely within the sl~tted opening with its axis transverse to tho opening. Referring to the drawings, the preferred embodimant of this invention as illustrated comprises two simllar side plat~s 5 and 6 ad~ustably secured to a centar plate 7 by bolts 17, such that plates 5 and 6 extend beyond one edge of plate 7 and such ~hat the ~lotted opening is formed betwsen Qnd plates 5 and 6. The holes in'center plate 7 through which bolts 17 pass are vertically elongated 80 that ',~
center plate 7 can be adjusted upwart or d,ownward vith respect to end plates 5 and 6. Side plate 6~has a small motor 21 attached thereto , .
such that the motor shaft 22 extends transver~ely through side plate 6 and into the space provit,ed between plate~ 5 and 6. A cylindrical grindin~ trum is axially secured over the motor shaft 22 and is contained entirely within the open~ng between plates 5 and 6 such that said plates S ant~6 provlde ~ shi21d on each side of the grind1ng~drum.
A preferred e~bodiment of the grinding drum is i11ustrated in ~i~. 2 and cDnsists of an expandable rubber d~um 8 which is snugly fitted over arbor 26. Arbor 26~is~aLially keyed to the motor shaft 22~ and an abraslve sleeve:9 Lnugly fitted over~rubber drum 8. The ~nd of the arbor 26 iL threaded to receive n~t 10 which can be tiBhtened s~inst washer 23 and rubber drum 8 causing rubber drum 8 to expsnd radially against, and thus~tightly secure,~abrading sleeve 9.
4 Pawlosky ,__ _, , , __ _, ,,~, ,___,____, ~ ,.. ___ .. ._ ~_~;_~r__.~~-- ~ ~ _ --' ' ~~ ' ~' '''~'-- ' ' ~ ' '' '~
:3LZ~36 The upper edge of center plate 7 is provided with a handle lS to facilitate handling of the sharpener while the }ower edge thereofj which is covered by plates 5 and 6, is provided with extended portions on each side of the grindlng drum which functicn as locating guides 12 ~hich will rest on the saw blade to limit the extent to which the apparatus can be $owered over the saw blade so that the grinding drum will be properly positioned with respect to the s~w tooth to be sharpened. By loosening bolts 17, the position of center plate 7 can be moved with respect to end plates 5 and 6 and thus the grinding drum to thereby properly adjust locating guides 12 to saw blades of differing sizes and configurations. The locating guides 12 are sach provided with a V groove 14 in the lower surface so that the sharpener can be centered over the saw blade as illustrated in Fig. 3.
A drum guard 16 is secured between side plates 5 and 6 which partially encircling the ~rinding drum on the lower ~nd forward side thereof.
The functions of the drum guard 16 is two-fold; first it protects the grinding drum from contacting any surface of the saw blade other than the tooth to be sharpened where sharpening is necessary, thereby eliminating any damage to the saw blade 13; and second, to permit the operator to advance the~sharpener from one tooth to the next without needing to turn off the sharpener motor 21.
Esch~of eide plates 5 snd 6 have two centering studs 20 that can be ~, ~
! ~ adjusted inwardly to the saw blade 13. If all four studs 20 are ;; adjusted equally against a~saw blade they will center the sharpener squarely over saw blade 13 for proper alignment.
Pawlosky 5~
As shown in Fig. 4 a stop set adjustment assembly is adjustably attached to side plate 6. This assembly consists merely of a cylindrical pin 18 attached to a pivotally and slidably adjustable bar 19 such thst pin 18 partially transverses the space between the side plates 5 and 6, and which can be adjusted to engage the first saw tooth behind the saw tooth being sharpened. This enables the operator to ~niformly control the amount of sharpening on each tooth, thus assuring greater accuracy and uniformity during the sharpening process.
The lower portions of side plates S und 6 extend sufficiently below the 8rindin8 drum to function as side shields covering the Brinding site to protect the operator from sparks and flying particles ~mitted by the 8rindin~ action. In order to facilitate adjustment, a hole or opening 24 is provided through the side of side plate 5 exposing that area where the grinding drum contacts the saw tooth. Then during operation a plastic cover 25 can be secured over or snapped into the opening to protect the operator. Ideally, cover 25 should be made of a transparent plastic so that it need not be removed to view the grounding area.
With the sharpening apparatus as tescribed above properly adjusted, its use is such a simple procedure that there is no need for the operator .
to be skilled. The operator ~ust merely low~r the sharpener over the saw blade 13 as shown in the drawings until the locating guides rest on the saw blade. The weight of the sharpener will automatically cause the upper part of the saw blade to be ceDtered in the v-grooves 14 in the end of the locating guides 12, while studs 20 will center the saw 6 Pawlosky blade therebelow so that the sharpener is centered and squared on the saw blade 13. With the power turned on and the grinding dru~
positioned in front of the saw tooth 11 to be sharpened as shown, the operator merely need to pull the sharpener to the rear so the grinding drum engages to the saw tooth effecting a good hollow ground sharpening action. ~hen pin 18 comes into contact with the saw tooth therebehind, the sharpener cannot be pulled to the rear any further and the tooth 11 is properly sharpened. To sharpen the next saw tooth, the operator should then push the sharpener fosward until the erinding drum drops in front of the next tooth. Drum guard 16 will permit this to be done wi~hout permittin~ the grinding drum to contact and damage any portion of the saw blade. The procedure must then be repeated. During the entire operation the operstor is of course protected by side plates 5 and 6.
It is well known that continua} use of a solid grinding wheel in the prior art shsrpeners will cause the wheel's grinding surface to be worn lesving a grooved or irregular surface. As a result, such grinding wheels must frequently be properly rejoined or dressed to restore the necessary grinding surface flatness. After numerous dressings it is of : ~ :
~course necessar~ to replace an e~cessively worn grinding wheel with a new one. Most prior art sharpeners will have to be readjusted each : : : :
~ -time the grinding wheel is removed ior dressing or replacement. The :
abraslve sleeve 16 as disclosed above provides a significant advantage in that it ~aintains its cylindrical configuration and indeed cannot be dressed. The grinding sleev~ 16j I~have utili~ed consists of a small, heavy-paper tube having an abrasive grit bonded to its outer surfsce.
:3LZ~36 The upper edge of center plate 7 is provided with a handle lS to facilitate handling of the sharpener while the }ower edge thereofj which is covered by plates 5 and 6, is provided with extended portions on each side of the grindlng drum which functicn as locating guides 12 ~hich will rest on the saw blade to limit the extent to which the apparatus can be $owered over the saw blade so that the grinding drum will be properly positioned with respect to the s~w tooth to be sharpened. By loosening bolts 17, the position of center plate 7 can be moved with respect to end plates 5 and 6 and thus the grinding drum to thereby properly adjust locating guides 12 to saw blades of differing sizes and configurations. The locating guides 12 are sach provided with a V groove 14 in the lower surface so that the sharpener can be centered over the saw blade as illustrated in Fig. 3.
A drum guard 16 is secured between side plates 5 and 6 which partially encircling the ~rinding drum on the lower ~nd forward side thereof.
The functions of the drum guard 16 is two-fold; first it protects the grinding drum from contacting any surface of the saw blade other than the tooth to be sharpened where sharpening is necessary, thereby eliminating any damage to the saw blade 13; and second, to permit the operator to advance the~sharpener from one tooth to the next without needing to turn off the sharpener motor 21.
Esch~of eide plates 5 snd 6 have two centering studs 20 that can be ~, ~
! ~ adjusted inwardly to the saw blade 13. If all four studs 20 are ;; adjusted equally against a~saw blade they will center the sharpener squarely over saw blade 13 for proper alignment.
Pawlosky 5~
As shown in Fig. 4 a stop set adjustment assembly is adjustably attached to side plate 6. This assembly consists merely of a cylindrical pin 18 attached to a pivotally and slidably adjustable bar 19 such thst pin 18 partially transverses the space between the side plates 5 and 6, and which can be adjusted to engage the first saw tooth behind the saw tooth being sharpened. This enables the operator to ~niformly control the amount of sharpening on each tooth, thus assuring greater accuracy and uniformity during the sharpening process.
The lower portions of side plates S und 6 extend sufficiently below the 8rindin8 drum to function as side shields covering the Brinding site to protect the operator from sparks and flying particles ~mitted by the 8rindin~ action. In order to facilitate adjustment, a hole or opening 24 is provided through the side of side plate 5 exposing that area where the grinding drum contacts the saw tooth. Then during operation a plastic cover 25 can be secured over or snapped into the opening to protect the operator. Ideally, cover 25 should be made of a transparent plastic so that it need not be removed to view the grounding area.
With the sharpening apparatus as tescribed above properly adjusted, its use is such a simple procedure that there is no need for the operator .
to be skilled. The operator ~ust merely low~r the sharpener over the saw blade 13 as shown in the drawings until the locating guides rest on the saw blade. The weight of the sharpener will automatically cause the upper part of the saw blade to be ceDtered in the v-grooves 14 in the end of the locating guides 12, while studs 20 will center the saw 6 Pawlosky blade therebelow so that the sharpener is centered and squared on the saw blade 13. With the power turned on and the grinding dru~
positioned in front of the saw tooth 11 to be sharpened as shown, the operator merely need to pull the sharpener to the rear so the grinding drum engages to the saw tooth effecting a good hollow ground sharpening action. ~hen pin 18 comes into contact with the saw tooth therebehind, the sharpener cannot be pulled to the rear any further and the tooth 11 is properly sharpened. To sharpen the next saw tooth, the operator should then push the sharpener fosward until the erinding drum drops in front of the next tooth. Drum guard 16 will permit this to be done wi~hout permittin~ the grinding drum to contact and damage any portion of the saw blade. The procedure must then be repeated. During the entire operation the operstor is of course protected by side plates 5 and 6.
It is well known that continua} use of a solid grinding wheel in the prior art shsrpeners will cause the wheel's grinding surface to be worn lesving a grooved or irregular surface. As a result, such grinding wheels must frequently be properly rejoined or dressed to restore the necessary grinding surface flatness. After numerous dressings it is of : ~ :
~course necessar~ to replace an e~cessively worn grinding wheel with a new one. Most prior art sharpeners will have to be readjusted each : : : :
~ -time the grinding wheel is removed ior dressing or replacement. The :
abraslve sleeve 16 as disclosed above provides a significant advantage in that it ~aintains its cylindrical configuration and indeed cannot be dressed. The grinding sleev~ 16j I~have utili~ed consists of a small, heavy-paper tube having an abrasive grit bonded to its outer surfsce.
7 Pawlosky 5~3~
As such, the abrasive sleeve 16 is very inexpensive. Accordingly, it is quicker and less costly to merely replace a ~o~n sleeve 16 with a new one than it is to dress a solid grinding wheel. In addition to being less costlyg the grinding sleeve 16 of this invention has a double life. As can be seen by reference to Fig. 4, the grinding sleeve 16 engages the saw tooth closer to its outer edge. When the outer edge is so worn that replacement is necessary, the operator can merely turn grinding sleeve 16 around on rubber drum 8 so the unworn inner surface beco~es outer surface, thereby doubling the life of each abrasive sleeve 16. In addition to the above advantages, the motor and grinding sleeve of thls inventive sharpening apparatus can easily and quickly be removed and replaced wlthout interfering with any of the sharpener's adjustments. This can be done quickly merely by detaching motor 21 from side plate 6 which does not affect any adjustments on the sharpener.
~, :
:
~ 8 Pawlosky .
~S~
As such, the abrasive sleeve 16 is very inexpensive. Accordingly, it is quicker and less costly to merely replace a ~o~n sleeve 16 with a new one than it is to dress a solid grinding wheel. In addition to being less costlyg the grinding sleeve 16 of this invention has a double life. As can be seen by reference to Fig. 4, the grinding sleeve 16 engages the saw tooth closer to its outer edge. When the outer edge is so worn that replacement is necessary, the operator can merely turn grinding sleeve 16 around on rubber drum 8 so the unworn inner surface beco~es outer surface, thereby doubling the life of each abrasive sleeve 16. In addition to the above advantages, the motor and grinding sleeve of thls inventive sharpening apparatus can easily and quickly be removed and replaced wlthout interfering with any of the sharpener's adjustments. This can be done quickly merely by detaching motor 21 from side plate 6 which does not affect any adjustments on the sharpener.
~, :
:
~ 8 Pawlosky .
~S~
Claims (9)
1. A hand-held, motor driven apparatus for sharpening saw blades consisting of a body member having a slotted opening partially therethrough such that said body member will straddle a saw blade to be sharpened in a saddle back manner to provide a side shield on each side of said saw blade adjacent to the tooth on said saw blade being sharpened, a motor attached to said body member such that the shaft on the motor extends transversely into the slotted opening, and a cylindrical grinding drum secured over the motor shaft as will provide a hollow ground sharpening action on the teeth of the saw blade being sharpened.
2. An apparatus according to claims 1 wherein said body member consists of two side plates adjustably bolted to a center plate such that the side plates extend beyond one edge of said center plate to form the slotted opening and side shields.
3. An apparatus according to claims 1 in which said cylindrical grinding drum consists of an expandable rubber drum axially secured over the motor shaft and a tight fitting cylindrical abrasive sleeve fitted over the rubber drum.
4. An apparatus according to claim 1 in which a locating guide is provided on each side of the cylindrical grinding drum which serves to adjustably limit the extent to which the body member can be lowered in saddle back manner over a saw blade.
5. An apparatus according to claim 4 in which each locating guide has a v-groove which contacts the saw blade to center the saw blade edge within the slotted opening.
6. An apparatus according to claims 1 having a grinding drum guard secured within said slotted opening consisting of a partial sleeve partially encircling said grinding drum on the forward and lower side such that the apparatus can be advanced over the saw blade being sharpened from one tooth to the next without the grinding drum coming into contact with any portion of the saw blade.
7. An apparatus according to claim 1 having a pin adjustably secured transversely within said slotted opening such that it can be adjusted to engage a saw tooth next to the saw tooth being sharpened to thereby limit the extent to which the grinding drum can grind the saw tooth being sharpened.
8. An apparatus according to claim 2 in which the edge of said center plate covered by the side plates extends downward on each side of the grinding drum to form locating guides which will rest against the saw blade to be sharpened thereby limiting the extent to which the apparatus can be lowered in saddle back over the saw blade.
9. An apparatus according to claim 8 in which the edges of said locating guides which rest against the saw blade are each provided with a v-groove which serve to center the saw blade between the two side plates.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US85572186A | 1986-04-25 | 1986-04-25 | |
| US06/855,721 | 1986-04-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1295836C true CA1295836C (en) | 1992-02-18 |
Family
ID=25321922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000534775A Expired - Lifetime CA1295836C (en) | 1986-04-25 | 1987-04-15 | Saw sharpening apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1295836C (en) |
-
1987
- 1987-04-15 CA CA000534775A patent/CA1295836C/en not_active Expired - Lifetime
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| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |