US3730239A - Circular saw with improved movable guard construction - Google Patents

Circular saw with improved movable guard construction Download PDF

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Publication number
US3730239A
US3730239A US00206639A US3730239DA US3730239A US 3730239 A US3730239 A US 3730239A US 00206639 A US00206639 A US 00206639A US 3730239D A US3730239D A US 3730239DA US 3730239 A US3730239 A US 3730239A
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US
United States
Prior art keywords
blade guard
lower blade
base plate
abutment formation
adjacent
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
Application number
US00206639A
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English (en)
Inventor
F Kaman
H Mcconnaughay
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Skil Corp
Original Assignee
Skil Corp
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 Skil Corp filed Critical Skil Corp
Application granted granted Critical
Publication of US3730239A publication Critical patent/US3730239A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B9/00—Portable power-driven circular saws for manual operation
    • B27B9/02—Arrangements for adjusting the cutting depth or the amount of tilting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
    • B27G19/04—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws for manually-operated power-driven circular saws

Definitions

  • the adjustably mounted base plate carries a first abutment formation adjacent the trailing end of the slot which is formed therein to receive the circular saw blade.
  • the lower blade guard has a second abutment formation thereon adjacent its work-engaging forward end. The second abutment formation is brought into abutting engagement with the first abutment formation upon movement of the lower blade guard toward its open position whereby the lower blade guard exposes only the blade teeth which extend through the slot in the base. plate irrespective of the angular disposition of the latter.
  • a manually operated retracting mechanism for the lower blade guard includes linkage operated by a handle mounted on the side of the fixed blade guard which is adjacent the tool motor.
  • the field of the invention relates to portable, power operated circular saws. More particularly, the invention relates to new and improved mechanism for the retractable lower blade guard of such a saw.
  • a circular saw with an adjustable base plate.
  • Such base plate is pivotally connected at its forward end to the saw housing for swinging movement about an axis parallel with the axis of rotation of the blade mounting shaft.
  • the base plate may be adjustably mounted in any desired position between a so-called normal position and a position inclined with respect thereto.
  • a circular saw of this type has a lower or movable blade guard which, in the closedposition thereof, cooperates with an upper or fixed blade guard to enclose substantially all of the teeth on the circular blade.
  • Circular saws of this type have been provided with manually operated retracting mechanisms for the lower blade guard. Many of such retracting mechanisms can be operated only by placing of the users fingers in the approximate vicinity of the saw blade, thereby presenting a hazardous situation.
  • a primary object of the present invention is the provision of a portable, power operated circular saw of the type described, which saw embodies new and improved safety features.
  • Another object of the present invention is the provision of a circular saw of the type described having cooperating abutment means on the base plate and lower blade guard so that irrespective of the position of the base plate the only teeth on the circular blade which are exposed are those extending through and beneath the slot in the base plate.
  • Still another object of the present invention is the provision of a circular saw of the type described having a retracting mechanism for the lower blade guard which embodies safety features, one such feature residing in the location of the operating lever of the retracting mechanism in an area quite remote from the exposed portion of the saw blade.
  • FIG. 1 is a perspective view of a circular saw embodying the present invention
  • FIG. 2 is an enlarged side elevational view of the saw of FIG. 1, with certain parts being broken away for better illustration of the invention
  • FIG. 3 is an enlarged, fragmentary view of the adjustment arm mounted on the base plate, which arm inturn mounts one of the abutment formations;
  • FIG. 4 is a section taken along the line 4-4 of FIG. 2, all parts being shown in broken lines except for the lower blade guard retracting mechanism;
  • FIG. 5 is a side elevational view of the circular saw as seen from the side opposite the side shown in FIG. 2;
  • FIG. 6 is an enlarged, fragmentary perspective view of the forward end of the lower blade guard showing the other abutment formation.
  • a portable, power operated circular saw generally designated10, which embodies the present invention, includes a frame or housing 11 having a fixed upper blade guard defined by a generally semicircular plate 12, an integral arcuate web 13 and an integral generally semiannular flange 15. This plate, web and flange cooperate to enclose the teeth on the upper portion of a circular saw blade 16.
  • the frame supports the usual handle 18.
  • the housing also defines a space 19 receiving; an electric motor 20 of suitable construction, such motor including a shaft 21 having teeth at the outer end thereof in engagement with the teeth on a gear 22.
  • This gear is mounted on a ship with the blade mounting shaft 23 therebymount ing the base plate for swinging movement back and forth between a normal position, shown in solid linesin FIG. 2, and an inclined position shown in broken lines in that figure of the drawings.
  • the base plate 25 includes an elongated slot 28 for I receiving a portion of the circular blade l6 therethrough.
  • the base plate also includes an upstanding bracket 29 adjacent the trailing end of the slot 28, which bracket is pivotally engaged, as by means of a pin 30, to an adjustment arm 31.
  • the adjustment arm includes an arcuate slot 32slidablyreceiving the stem .of an adjustment fastener 34, such fastener including an operating lever 35.
  • the lever 35 is operated to control frictional engagement between the fastener 34 and the arm 31 thereby releasably to secure the base plate in either the normal or inclined positions shown or in any selected position therebetween to achieve the desired depth ,of cut;
  • the base plate is also mounted by adjustment means (not shown) for pivoting movement about its longitudinal axis to perform bevel sawmg. V
  • a lower blade guard generally designated 37, includes a plate 38 having a circular opening receiving a bearing ring 39, the latter being concentric with the blade mounting shaft 23 and mounting the lower blade guard 37 for rotation about such shaft.
  • the lower blade guard includes an arcuate web 40 integral with the plate 38 and an arcuately extending flange 41 which in turn is integral with the web 40.
  • the lower blade guard 37 is illustrated in the closed position thereof in FIG. 2 with the rearward portion thereof being nested within the rearward portion of the t upper blade guard. in such closed position, the lower blade guard cooperates with the upper blade guard to enclose substantially all of the teeth on the circular blade 16 only a few teeth between the base plate 25 (when the same is in its normal position) and the work engaging or forward end 42 of the lower blade guard are exposed.
  • An abutment formation 44 is welded or otherwise secured to the adjustment arm 31 as best illustrated in FIG. 3.
  • Another abutment formation 45 is integrally formed on the plate 38 of the lower blade guard adjacent the forward end 42 of the latter. These abutment formations are arranged such that the formation 45 will be brought into abutting engagement with the formation 44 during movement (clockwise as seen in FIG. 2) of the lower blade guard 37 from its closed position toward its open or retracted position. This engagement between the abutment formations prevents furthe; movement of the lower blade guard toward its open position.
  • a manually operated retracting mechanism for the lower blade guard includes an operating lever 47 pivotally mounted to the plate 12 of the upper blade guard, as by means of a pin 48. It is noted that this operating lever is mounted on the side of the upper blade guard which is adjacent the housing 11 enclosing the motor 20. The distal end of this lever includes a finger engaging portion 49.
  • a first link 50 has one end thereof secured to the pin 48 for movement in unison with the operating lever 47.
  • the link 50 which is disposed within the upper blade guard, has the other end thereof pivotally connected, as by means of a pin 52, to one end of another link 53.
  • the link 53 has the other end thereof pivotally engaged with the lower blade guard 37, as by means of a pin 54.
  • a spring 55 has one end thereof engaged with the plate 38 of the lower blade guard and the other end thereof connected to the plate 12 of the upper blade guard; the spring 55 acts to urge the lower blade guard 37 in a counterclockwise direction (FIG. 2) to the closed position illustrated in that figure.
  • a stop 56 is mounted on the plate 12 of the upper blade guard to limit movement of the operating lever 47 and thereby prevent possible bending or jamming of the links 50, 53 during return movement of the operating lever 47. Since the operating lever is positioned in remote relationship from the portion of the circular blade which is exposed to contact the work, there is little or no danger of the operators hand coming into engagement with the saw teeth when operating the retracting mechanism. As is conventional in the art, a pin 57 is provided on the lower blade guard as an alternate means for retracting the same.
  • a portable, power operated circular saw of the type having a powered blade mounting shaft and a frame including a fixed blade guard adapted to enclose the teeth on the upper portion of a circular blade mounted on said shaft, a base plate having an elongated slot for receiving a portion of the circular blade therethrough, pivot means securing said base plate to said frame adjacent the leading end of the former for pivoting movement about an axis parallel with the axis of rotation of said shaft back and forth between a normal position and an inclined position, and adjustment means for securing said base plate in said positions and in any location therebetween, the improvement comprising:
  • a lower blade guard mounted on said frame for swinging movement back and forth between a closed position and an open position, which lower blade guard in the closed position thereof cooperates with said upper blade guard to enclose substantially all of the teeth on the blade;
  • said lower blade guard having a work engaging forward end and a second abutment formation thereon which is adjacent said forward end, said second abutment formation being brought into abutting engagement with said first abutment formation upon movement of said lower blade guard from the closed position thereof toward the open position thereof whereby the lower blade guard exposes only the blade teeth which extend through said slot and beneath said base plate irrespective of the location of the base plate between said positions thereof.
  • said adjustment means including an adjustment arm mounted on said base plate adjacent the trailing end of said slot, said first abutment formation being integral with said arm;
  • biasing means engaged with said frame and said lower blade guard for urging the latter toward said closed position thereof.
  • said connecting means includes a pair of links, one link being secured at one end thereof to said lever for movement in unison with the latter, the other link having one of its ends pivotally connected with the other end of said one link and having its other end pivotally con- 0

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Knives (AREA)
  • Sawing (AREA)
US00206639A 1971-12-10 1971-12-10 Circular saw with improved movable guard construction Expired - Lifetime US3730239A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20663971A 1971-12-10 1971-12-10

Publications (1)

Publication Number Publication Date
US3730239A true US3730239A (en) 1973-05-01

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ID=22767291

Family Applications (1)

Application Number Title Priority Date Filing Date
US00206639A Expired - Lifetime US3730239A (en) 1971-12-10 1971-12-10 Circular saw with improved movable guard construction

Country Status (8)

Country Link
US (1) US3730239A (de)
JP (1) JPS5544687B2 (de)
AU (1) AU460017B2 (de)
CA (1) CA957595A (de)
CH (1) CH553041A (de)
DE (1) DE2248512A1 (de)
FR (1) FR2164144A5 (de)
NL (1) NL7213446A (de)

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787973A (en) * 1972-12-15 1974-01-29 Skil Corp Safety retracting mechanism for the lower guard of a portable saw
US4490909A (en) * 1982-11-26 1985-01-01 The E. H. Wachs Company Travelling pipe cutter
US4856394A (en) * 1988-04-14 1989-08-15 Porter-Cable Corporation Portable circular saw
EP0459121A2 (de) * 1990-05-30 1991-12-04 Robert Bosch Gmbh Führungsschlitten für eine handgeführte Werkzeugmaschine
US5075976A (en) * 1991-02-05 1991-12-31 Young Peter W Power tool guard retainer
DE4124234A1 (de) * 1991-07-22 1993-01-28 Bosch Gmbh Robert Handkreissaege und saegeverfahren
US5370025A (en) * 1992-08-13 1994-12-06 Milwaukee Electric Tool Corporation Motorized saw with movable blade guard actuating linkage
US5832614A (en) * 1997-05-20 1998-11-10 S-B Power Tool Company Remote lower guard lift lever mechanism for circular saws
US6161293A (en) * 1998-08-14 2000-12-19 One World Technologies, Inc. Battery powered circular saw
US6304058B2 (en) 1998-08-13 2001-10-16 Black & Decker Inc. Cordless power tool system
US6329788B1 (en) 1998-08-13 2001-12-11 Black & Decker Inc. Cordless power tool system
US20020157265A1 (en) * 2001-04-26 2002-10-31 Makita Corporation Circular saw with an improved lower blade guard
USD487385S1 (en) 2002-06-07 2004-03-09 Black & Decker Inc. Circular saw handle
US6735875B1 (en) * 2002-05-22 2004-05-18 At&T Corp. Tool for removing duct surrounding a fiber optic cable
US20040157541A1 (en) * 2001-06-29 2004-08-12 Dieter Wendt Protective device for a hand machine tool
US6898854B2 (en) 2002-06-07 2005-05-31 Black & Decker Inc. Modular power tool
US7020970B1 (en) * 2001-10-23 2006-04-04 James Welch Saw guard system
US20070022852A1 (en) * 2005-09-09 2007-02-01 Tracy Jack R Retractor for circular saw lower safety-guard
US7310879B1 (en) 2006-07-27 2007-12-25 Robert Bosch Gmbh Cutting attachment having an adjustable foot for rotary hand tools
US20080022537A1 (en) * 2006-07-27 2008-01-31 Credo Technology Corporation Cutting attachment with a removable cover for rotary hand tools
US20080078090A1 (en) * 2006-05-19 2008-04-03 Johnson Charles E Iii Manual Saw Guard Retracting Device
US20080305387A1 (en) * 2007-06-11 2008-12-11 Black & Decker Inc. Cordless power tool system
US20110099819A1 (en) * 2009-11-04 2011-05-05 John Michael Orlowski Safety Guard for Power Saw
US20130185947A1 (en) * 2011-09-01 2013-07-25 Robert Bosch Gmbh Brushless dc motor-driven power device
CN104029181A (zh) * 2013-03-04 2014-09-10 罗伯特·博世有限公司 手工工具机
US9009982B1 (en) * 2012-03-29 2015-04-21 Simon J. Sedgwick Dustless drywall cutting tool
US10875109B1 (en) 2018-04-30 2020-12-29 Kreg Enterprises, Inc. Adaptive cutting system
CN112368097A (zh) * 2018-07-02 2021-02-12 胡斯华纳有限公司 用于动力工具的保护布置结构
US11364652B2 (en) * 2019-09-03 2022-06-21 Makita Corporation Portable cutting machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0634897Y2 (ja) * 1987-01-12 1994-09-14 リョービ株式会社 テーブルソーのロアーガード装置
DE3912307A1 (de) * 1989-04-14 1990-10-25 Metabowerke Kg Kreissaege mit spaltkeil

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2963056A (en) * 1958-06-05 1960-12-06 Vernon W Rickford Electric saw safety guard retractor
US3441067A (en) * 1965-10-22 1969-04-29 Fred A Forcier Mechanical guard lifter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2963056A (en) * 1958-06-05 1960-12-06 Vernon W Rickford Electric saw safety guard retractor
US3441067A (en) * 1965-10-22 1969-04-29 Fred A Forcier Mechanical guard lifter

Cited By (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787973A (en) * 1972-12-15 1974-01-29 Skil Corp Safety retracting mechanism for the lower guard of a portable saw
US4490909A (en) * 1982-11-26 1985-01-01 The E. H. Wachs Company Travelling pipe cutter
US4856394A (en) * 1988-04-14 1989-08-15 Porter-Cable Corporation Portable circular saw
EP0459121A2 (de) * 1990-05-30 1991-12-04 Robert Bosch Gmbh Führungsschlitten für eine handgeführte Werkzeugmaschine
EP0459121A3 (en) * 1990-05-30 1992-05-20 Robert Bosch Gmbh Sliding guide for handheld machine tool
US5075976A (en) * 1991-02-05 1991-12-31 Young Peter W Power tool guard retainer
DE4124234A1 (de) * 1991-07-22 1993-01-28 Bosch Gmbh Robert Handkreissaege und saegeverfahren
US5370025A (en) * 1992-08-13 1994-12-06 Milwaukee Electric Tool Corporation Motorized saw with movable blade guard actuating linkage
US5832614A (en) * 1997-05-20 1998-11-10 S-B Power Tool Company Remote lower guard lift lever mechanism for circular saws
US6304058B2 (en) 1998-08-13 2001-10-16 Black & Decker Inc. Cordless power tool system
US7005831B2 (en) 1998-08-13 2006-02-28 Black & Decker Inc. Cordless power tool system utilizing battery pack connection system with guide rails and guide slots
US6329788B1 (en) 1998-08-13 2001-12-11 Black & Decker Inc. Cordless power tool system
US7598705B2 (en) 1998-08-13 2009-10-06 Black & Decker Inc. Cordless power tool system having cordless power tool and battery pack that employ cooperating rails and grooves for connection of battery pack to cordless power tool
US6653815B2 (en) 1998-08-13 2003-11-25 Black & Decker Inc. Cordless power tool system
US20080284373A1 (en) * 1998-08-13 2008-11-20 Watson James B Cordless power tool system having slidably-engaging power source connection
US7423407B2 (en) 1998-08-13 2008-09-09 Black & Decker Inc. Cordless power tool system having slidably-engaging power source connection
US7343683B2 (en) 1998-08-13 2008-03-18 Black & Decker Inc. Battery powered circular saw
US20040196002A1 (en) * 1998-08-13 2004-10-07 Watson James B. Cordless power tool system
US20060108981A1 (en) * 1998-08-13 2006-05-25 Watson James B Cordless power tool system
US20060107536A1 (en) * 1998-08-13 2006-05-25 Buck John E Battery powered circular saw
US6996909B1 (en) 1998-08-13 2006-02-14 Black & Decker Inc. Battery powered circular saw
US6161293A (en) * 1998-08-14 2000-12-19 One World Technologies, Inc. Battery powered circular saw
US7089671B2 (en) * 2001-04-26 2006-08-15 Makita Corporation Circular saw with an improved lower blade guard
US20020157265A1 (en) * 2001-04-26 2002-10-31 Makita Corporation Circular saw with an improved lower blade guard
US6953394B2 (en) * 2001-06-29 2005-10-11 Robert Bosch Gmbh Protective device for a hand machine tool
US20040157541A1 (en) * 2001-06-29 2004-08-12 Dieter Wendt Protective device for a hand machine tool
US7020970B1 (en) * 2001-10-23 2006-04-04 James Welch Saw guard system
US6735875B1 (en) * 2002-05-22 2004-05-18 At&T Corp. Tool for removing duct surrounding a fiber optic cable
US20050198831A1 (en) * 2002-06-07 2005-09-15 Black & Decker Inc. Modular power tool
US6898854B2 (en) 2002-06-07 2005-05-31 Black & Decker Inc. Modular power tool
US7814663B2 (en) 2002-06-07 2010-10-19 Black & Decker Inc. Modular power tool
US7805841B2 (en) 2002-06-07 2010-10-05 Black & Decker Inc. Modular power tool
USD487385S1 (en) 2002-06-07 2004-03-09 Black & Decker Inc. Circular saw handle
US20080189955A1 (en) * 2002-06-07 2008-08-14 Black & Decker Inc. Modular power tool
EP1928636A4 (de) * 2005-09-09 2008-12-03 Sj2 Ind Llc Rückziehvorrichtung für den unteren sicherheitsschutz bei kreissägen
US7426787B2 (en) 2005-09-09 2008-09-23 Sj2 Industries, Llc Retractor for circular saw lower safety-guard
US20080271310A1 (en) * 2005-09-09 2008-11-06 Tracy Jack R Method of retrofitting a circular saw
EP1928636A2 (de) * 2005-09-09 2008-06-11 SJ2 Industries, LLC Rückziehvorrichtung für den unteren sicherheitsschutz bei kreissägen
US7832072B2 (en) 2005-09-09 2010-11-16 Sj2 Industries, Llc Method of retrofitting a circular saw
US20070022852A1 (en) * 2005-09-09 2007-02-01 Tracy Jack R Retractor for circular saw lower safety-guard
US20080078090A1 (en) * 2006-05-19 2008-04-03 Johnson Charles E Iii Manual Saw Guard Retracting Device
US20080022537A1 (en) * 2006-07-27 2008-01-31 Credo Technology Corporation Cutting attachment with a removable cover for rotary hand tools
US7596872B2 (en) 2006-07-27 2009-10-06 Robert Bosch Gmbh Cutting attachment with a removable cover for rotary hand tools
US7310879B1 (en) 2006-07-27 2007-12-25 Robert Bosch Gmbh Cutting attachment having an adjustable foot for rotary hand tools
US20080305387A1 (en) * 2007-06-11 2008-12-11 Black & Decker Inc. Cordless power tool system
US20110099819A1 (en) * 2009-11-04 2011-05-05 John Michael Orlowski Safety Guard for Power Saw
US8413340B2 (en) * 2009-11-04 2013-04-09 John Michael Orlowski Safety guard for power saw
US20130185947A1 (en) * 2011-09-01 2013-07-25 Robert Bosch Gmbh Brushless dc motor-driven power device
US9009982B1 (en) * 2012-03-29 2015-04-21 Simon J. Sedgwick Dustless drywall cutting tool
CN104029181A (zh) * 2013-03-04 2014-09-10 罗伯特·博世有限公司 手工工具机
CN104029181B (zh) * 2013-03-04 2017-10-13 罗伯特·博世有限公司 手工工具机
US10875109B1 (en) 2018-04-30 2020-12-29 Kreg Enterprises, Inc. Adaptive cutting system
CN112368097A (zh) * 2018-07-02 2021-02-12 胡斯华纳有限公司 用于动力工具的保护布置结构
CN112368097B (zh) * 2018-07-02 2023-09-12 胡斯华纳有限公司 手持式动力切割机
US11364652B2 (en) * 2019-09-03 2022-06-21 Makita Corporation Portable cutting machine

Also Published As

Publication number Publication date
JPS4866298A (de) 1973-09-11
NL7213446A (de) 1973-06-13
FR2164144A5 (de) 1973-07-27
CH553041A (fr) 1974-08-30
CA957595A (en) 1974-11-12
AU460017B2 (en) 1975-04-10
DE2248512A1 (de) 1973-06-14
AU4569572A (en) 1974-02-21
JPS5544687B2 (de) 1980-11-13

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