Guard for circular saw

• US 4,026,174 A
• Filed: 12/08/1975
• Issued: 05/31/1977
• Est. Priority Date: 12/18/1974
• Status: Expired due to Term

• Current Assignee: Justo Vidaller Fierro
• Original Assignee: Justo Vidaller Fierro
• Inventors: Fierro, Justo Vidaller
• Primary Examiner(s): Yost, Frank T.
• Application Number:
  US05/638,671
• Time in Patent Office: 540 Days
• Field of Search: 83/438, 83/478, 83/DIG. 1, 83/544, 83/397
• US Class Current: 83/438
• CPC Class Codes: B27G 19/02 for circular saws
• CPC Class Codes: Y10S 83/01 Safety devices
• CPC Class Codes: Y10T 83/727 With means to guide moving work
• CPC Class Codes: Y10T 83/7734 With guard for tool

Abstract

A guard for a circular saw having a pair of cranked supports pivotally mounted to the work table at either side of the saw blade, an arm pivotally mounted to the supports extending in line with the saw blade and above it, and a guard member pivotally mounted to the arm having parallel limbs spaced apart and disposed at respective sides of the upper periphery of the saw blade to guard it. There is a plate which joins these arms and which extends transversely of the saw blade to prevent articles cut out from the work piece from being violently ejected from the vicinity of the saw blade. The supports also pivotally carry a plate which is in line with the saw blade and movable between an operative position in which an edge of the plate lies closely adjacent the rear edge of the saw blade, and an inoperative position in which the blade is raised above the table. A further guard member for the front edge of the saw blade extends down from the arm in front of the blade. This guard member is a rotatable wheel displaceable relative to the arms. Workpieces to be cut are fed under the wheel to the saw blade. An adjustable fence for guiding the cutting of workpieces is also provided.

Claims

1. In a guard for the blade of a circular saw, the blade having an exposed arcuate portion, said portion having a front edge against which workpieces to be sawed are fed an opposite rear edge and an upper edge, the upper edge extending between and being higher than said front and rear edges, the guard comprising support means, an arm extending from said support means, at least one position retaining means for said arm, a front guard member, and means on said arm connecting said front guard member to said arm such that said front guard member is displaceable relative to said arm, to permit passage of workpieces to be cut, said guard being constructed and adapted to be mounted with the arm located by the position retaining means above the blade, and with the front guard member protecting the front edge of the blade, the improvement comprising an upper edge guard member carried by the arm, said upper edge guard member comprising two limbs in spaced relation, to lie at respective sides of, and thereby guard said upper edge of the blade, said arm being a double arm, comprising two arm members and means constraining said members in spaced relation, and wherein the guard further comprises means mounting said upper edge guard member to said arm, between said two arm members thereof.

2. A guard according to claim 1 wherein said limbs are planar and are parallel to each other and wherein said upper edge guard member further comprises a transverse member, said transverse member extending transversely between said two limbs of said upper edge guard member and being fast with them, whereby said transverse member constrains said limbs into their said spaced relation, and whereby said transverse member is disposed above and transversely of said blade.

3. A guard according to claim 2 wherein said transverse member is a plate, and is positioned to prevent particles torn off from a workpiece during sawing from being violently ejected from the saw blade.

4. A guard according to claim 2 wherein the guard further comprises means pivotally mounting said upper edge guard member to said arm, and stop means limiting pivotal movement of said upper edge guard member thereby maintaining said upper edge guard member with its said transverse member above said blade.

5. A guard according to claim 1 wherein said arm is pivotally mounted, and rests on said position retaining means, thereby being located above said blade.

6. A guard according to claim 1 further comprising a rear guard plate said rear guard plate having a front edge plate being mountable to lie in line with said blade with said front edge of said plate adjacent said rear edge of said blade, thereby to guard said rear edge.

7. In a guard for the blade of a circular saw, the blade having an exposed arcuate portion, said portion having a front edge against which workpieces to be sawed are fed, an opposite rear edge and an upper edge, the upper edge extending between and being higher than said front and rear edges, the guard comprising support means, an arm extending from said support means, at least one position retaining means for said arm, a front guard member, and means on said arm connecting said front guard member to said arm such that said front guard member is displaceable relative to said arm, to permit passage of workpieces to be cut, said guard being constructed and adapted to be mounted with the arm located by the position retaining means above the blade, and with the front guard member protecting the front edge of the blade, the improvement comprising an upper edge guard member carried by the arm, said upper edge guard member comprising two limbs in spaced relation, to lie at respective sides of, and thereby guard said upper edge of the blade, said front guard member comprising a freely rotatable wheel, said wheel being carried by a bifurcated member, said bifurcated member being pivotally mounted to said arm.

8. In a guard for the blade of a circular saw, the blade having an exposed arcuate portion, said portion having a front edge against which workpieces to be sawed are fed, an opposite rear edge and an upper edge, the upper edge extending between and being higher than said front and rear edges, the guard comprising support means, an arm extending from said support means, at least one position retaining means for said arm, a front guard member, and means on said arm connecting said front guard member to said arm such that said front guard member is displaceable relative to said arm, to permit passage of workpieces to be cut, said guard being constructed and adapted to be mounted with the arm located by the position retaining means above the blade, and with the front guard member protecting the front edge of the blade, the improvement comprising an upper edge guard member carried by the arm, said upper edge guard member comprising two limbs in spaced relation, to lie at respective sides of, and thereby guard said upper edge of the blade, a rear guard plate having a front edge and being situated in line with said blade with said front edge of said plate being adjacent said rear edge of said blade, thereby to guard said rear edge, said rear guard plate being pivotally mounted to said support means so as to be rotatable between a normal position and an inoperative position, in said normal position said front edge plate lying adjacent said rear edge of said blade, and in said inoperative position said plate being further from said blade to give access thereto, the guard further comprising respective retractable locking members to retain said plate in the respective positions thereof, said plate defining respective apertures to receive each said locking member.

9. A circular saw comprising a work table, a saw blade and a guard, the work table having a working surface, and said blade having an arcuate exposed portion projecting through said table, said exposed portion having a front edge against which workpieces to be sawed are fed, an opposite rear edge and an upper edge, said upper edge extending between and being higher than said front and rear edges, the guard comprising support means mounted to said work table, an arm extending from said support means above the blade, and a front guard member carried by said arm but displaceable relative thereto, said front guard member protecting said front edge of said blade and an upper edge guard member carried by said arm, said upper edge guard member comprising two limbs in spaced relation and lying at respective sides of, and thereby guarding, said upper edge of said blade, a fence supporting plate pivotally mounted to an edge of said work table at one side of said blade, a fence, and slide means slidingly supporting said fence on said fence supporting plate to be adjustable towards and away from said blade and clamping means operable on said slide means for clamping said fence after adjustment thereof.

10. Circular saw according to claim 9 further comprising projections on said fence supporting plate engageable with corresponding holes in said working surface of said table engagement of said projections with said holes stabilising said fence supporting plate on said working surface.

11. A circular saw comprising a work table, a saw blade and a guard, the work table having a working surface, and said blade having an arcuate exposed portion projecting through said table, said exposed portion having a front edge against which workpieces to be sawed are fed, an opposite rear edge and an upper edge, said upper edge extending between and being higher than said front and rear edges, the guard comprising support means mounted to said work table, an arm extending from said support means above the blade, and a front guard member carried by said arm but displaceable relative thereto, said front guard member protecting said front edge of said blade and an upper edge guard member carried by said arm, said upper edge guard member comprising two limbs in space relation and lying at respective sides of, and thereby guarding, said upper edge of said blade, a rear guard plate, said rear guard plate having a front edge, said rear guard plate being disposed in line with said blade wherein said support means comprises a pair of supports pivotally mounted to said work table at respective sides of said blade, said supports terminating in shafts, said rear guard plate having further shafts projecting therefrom at either side thereof said shafts and said further shafts being on a common axis, a said shaft and a said further shaft at each side of said plate having a coaxial sleeve, said sleeves rotatably connecting said shafts and further shafts, and wherein said rear guard plate is rotatable relative to said support means between a normal position and an inoperative position, in said normal portion said front edge of said rear guard plate being disposed adjacent said rear edge of said blade, and in said inoperative position said rear guard plate being raised above said work table thereby giving greater access to said rear edge of said blade.

12. A saw according to claim 11 wherein said blade has peripheral cutting teeth, the cutting teeth, when sharp, having an outward pitch, whereby said teeth effect a cut in a workpiece of predetermined width, said rear guard plate having a thickness less than said predetermined width, whereby said rear guard plate does not impede passage of a workpiece being cut, provided said cutting teeth of said blade are sharp.

13. A circular saw according to claim 11 wherein said arm is a double arm, comprising two arm members and means constraining said arm members in spaced relation, said arm members having ends proximate said rear guard plate and ends remote therefrom, said ends proximate said rear guard plate being pivotally mounted to respective ones of said further shafts projecting from said plate.

14. A circular saw according to claim 11 further comprising respective locking pins engageable in respective holes in said plate to retain said plate respectively in said normal and said inoperative positions, the pin retaining said plate in its inoperative position further comprising a stop, said rear guard plate further comprising a projecting abutment,

in said normal position of said plate, said arm bearing on said abutment and being supported thereby above said saw blade,

and in said inoperative position of said plate, said arm bearing on said stop and being supported thereby over said blade.