US3701369A - Circular saw - Google Patents

Circular saw Download PDF

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Publication number
US3701369A
US3701369A US3701369DA US3701369A US 3701369 A US3701369 A US 3701369A US 3701369D A US3701369D A US 3701369DA US 3701369 A US3701369 A US 3701369A
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US
United States
Prior art keywords
blade guard
kerf
blade
shaft
circular
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
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English (en)
Inventor
Ronald E Gronke
William H Schultz
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
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Filing date
Publication date
Application filed by Skil Corp filed Critical Skil Corp
Application granted granted Critical
Publication of US3701369A publication Critical patent/US3701369A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2074—Including means to divert one portion of product from another
    • Y10T83/2077—By kerf entering guide

Definitions

  • the circular saw includes a movable blade guard mounted for rotation about an axis offset from the axis of rotation of the circular blade, such guard enclosing a kerf guide and the teeth on the lower portion of the blade.
  • the movable blade guard is retracted by a manually operable lever mounted on the side of the fixed blade guard adjacent the motor housing.
  • the kerf guide is adjustably mounted so as to be rocked in its own plane thereby to cooperate with circular blades of difi'erent diameters.
  • a primary object of the present invention is the provision of a new and improved circular saw having a number of features contributing to safe operation of such saw.
  • Another object of the present invention is the provision of a new and improved circular saw having a movable blade guard adapted to enclose both a kerf guide and the teeth on the lower portion of a circular blade.
  • Another object of the present invention is the provision of a new and improved circular saw having a movable blade guard and a retracting mechanism therefor, such mechanism being operated by a lever mounted from the side of the fixed blade guard adjacent the motor housing.
  • Still another object of the present invention is the provision of a new and improved circular saw having a fixed blade guard and a movable blade guard, which movable blade guard, in the closed position thereof, cooperates with the fixed blade guard to enclose substantially the entire periphery of a circular blade.
  • Another object of the present invention is the provision of a new and improved circular saw having an adjustably mounted kerf guide, the means mounting said kerf guide causing rocking movement of the latter in its own plane so as to cooperate with circular blades of different diameters.
  • FIG. 1 is a perspective view of a circular saw embodying the present invention
  • FIG. 2 is an enlarged section taken generally along the line 22 of FIG. 1 and showing a circular blade mounted on the motor driven shaft;
  • FIG. 3 is an enlarged section taken generally along the line 3-3 of FIG. 2, with the circular blade being removed and with a portion of the fixed blade guard being shown in side elevation for illustrating the means adjustably mounting the kerf guide;
  • FIG. 4 is an enlarged isometric view of a portion of the tool with a part of the fixed blade guard being broken away and with the circular blade being removed.
  • a circular saw embodying the present invention includes a motor housing mounting a handle 11, which handle may support an auxiliary handle in the form of a knob 12.
  • the saw includes the usual base plate 13, which base plate is mounted for vertical adjustment by a knob 14 and for angular adjustment by another knob 14a.
  • the housing 10 mounts an electric motor 15 by means of bearing assemblies 16 and I7 engaged with respective opposite ends of the armature shaft 18.
  • Such shaft is splined, as at 180, and is in driving engagement with a gear 20 mounted on a shaft 21, the latter being journaled in a roller bearing assembly 22 and in a ball bearing assembly 23.
  • the drive shaft 21 includes a threaded blind bore (not shown) for receiving a screw 24, the latter supporting a washer 25 and serving to mount a circular blade 26 on the drive shaft 21.
  • the housing 10 mounts a fixed blade guard having an inner wall portion 28, an outer wall portion 29 and a connecting wall portion 30.
  • the fixed blade guard is of general semicircular configuration and encloses the teeth on the upper one-half portion of the circular saw.
  • the housing 10 includes a formation 32 encircling the shaft 21; this formation defines an annular bearing surface 324 having a central axis 33 (FIG. 3)parallel with and in spaced relation to the central axis 34 of the shaft 21.
  • This bearing surface rotatably mounts a ring formation 35, the latter being integral with an inner wall portion 36 of a movable blade guard.
  • This movable guard also includes a connecting wall portion 38.
  • the movable blade guard is retained on the bearing surface 324 by a split ring 39 received in an annular groove in such bearing surface. It will be understood that by reason of the aforedescribed construction, the movable blade guard is mounted for rotation about the axis 33 which is offset from or eccentric to the axis 34 which defines the axis of rotation of the circular blade 26.
  • a flexible member 40 is wrapped around a portion of the ring 35 and has one end thereof connected to a flange 350 as by means of a stud 41; the flange is mounted on the ring 35 for movement therewith.
  • the other end of the member 40 is pivotally connected to an arm 42, the latter being mounted on a pin 43.
  • This pin is journaled in an aperture 28a formed in the fixed guide wall portion 28.
  • An operating handle or lever 44 is mounted on the pin 43 so as to impart rotation to the latter. It will be understood that rotation of the handle 44 serves to rotate or retract the movable blade guard.
  • the movable blade guard is urged toward the closed position thereof as shown in the drawings by means of a coil spring 47, one end of the latter being connected to the ring flange 35a and the other end thereof being secured to the wall portion 28 ofthe fixed blade guard.
  • a stop (not shown) is engaged by the edge 36b of the movable blade guard to limit counterclockwise rotation of the latter. As is known to those skilled in the art, this stop is preferably mounted for movement with the base plate 13 so that as the latter is adjusted vertically, the movable blade will be automatically rotated to maintain the proper relationship between the same and the base plate.
  • the wall portion 29 of the fixed blade guard mounts a block 50, the latter having a pair of threaded openings (not shown) threadingly receiving a pair of fasteners 51, 52.
  • a bracket has a wall portion 53 con taining a pair of slots 54, 55, which slots receive the shanks of respective fasteners 51, 52.
  • This bracket has another wall portion 57 in parallel relation with the wall portion 53 and integral therewith by means of a connecting wall portion 58.
  • the wall portion 51 mounts a kerf guide 60, the latter having a distal end portion 600 and an arcuate leading edge 6% adjacent the distal end. It will be understood that the kerf guide 60 is coplanar with the blade 26 and adapted to enter the kerf formed by the latter.
  • the slots 54, 55 although generally perpendicular to radii of the blade, are not in parallel relation with each other, but rather diverge in a generally upward direction such that the upper ends of the slots are spaced a greater distance from each other than the lower ends of such slots.
  • the lterf guide is shown mounted in the desired position when the saw has a blade 26, the periphery of which is shown in phantom lines in this figure.
  • the edge 60b is spaced five-sixtyfourths inch from the blade and the distal end 600 is one-eighth inch above the lowermost portion of the blade.
  • the kerf guide 60 may be adjusted so as to cooperate with the blade represented by the phantom line 26'.
  • the fasteners 51, 52 are loosened and the bracket is slid upwardly to the phantom line position shown in FIG. 3.
  • the bracket is rocked shown in phantom lines, this movement imparting corresponding rocking movement to the kerf guide 60 such that the same occupies the position shown as 60'.
  • This rocking action of the kerf guide in its own plane permits the same to be adjusted to establish optimum spacing between the smaller diameter blade 26' and the leading edge 60!) of the kerf guide adjacent its distal end 600.
  • this camming feature of the slots 54, 55 permits a predetermined spacing to be maintained between the distal end of the kerf guide and circular blades of different diameters.
  • the lterf guide may be adjusted with respect to the blade 26' to maintain the 5/64 and A dimensions mentioned above.
  • FIG. 3 which shows the base plate 13 in the uppermost position thereof
  • the movable blade guard when the movable blade guard is in its closed position, substantially the entire periphery of the circular blade is enclosed. in this closed position of the movable blade guard, the only portion of the blade which is exposed is an approximate sector as defined by the leading end 62 of the movable blade guard and the adjacent forward end portion 63 of the fixed blade guard. This sector is of course increased as the base plate 13 is adjusted to a lower position. However, the close relationship between the underside of the base plate and the leading end 62 of the movable blade guard as shown in FIG. 3 is maintained irrespective of the position of the base plate.
  • a roller 64 is mounted on the latter, such roller being arranged to engage the work to facilitate opening of the lower blade guard. of course, the movable blade guard may be retracted before engagement with the work by manual operation of the handle 44.
  • the present invention provides a new and improved circular saw having significant safety features.
  • the operator may retract the movable blade guard without bringing his hand into proximity with the movable blade guard or any exposed portion of the blade.
  • safe operation results from the fact that a maximum portion of the periphery of the circular blade is enclosed when the movable guard is in its closed position thereby minimizing the chances of the operators fingers coming into contact with the teeth on the saw blade.
  • the eccentrically mounted movable blade guard encloses the kerf guide as well as a substantial number of the teeth on the lower portion of the circular blade. This feature obviates slotting of the movable blade guard to accommodate the lterf guide.
  • the kerf guide is adjustably mounted by improved means thereby permitting the kerf guide to maintain the desired spacing relationships with blades having different diameters.
  • a portable, power operated circular saw of the type having a motor driven, blade mounting shaft and a fixed blade guard adapted to enclose the teeth on the upper portion of a circular blade mounted on said shaft, the improvement comprising:
  • a kerf guide and means mounting the same adjacent said fixed blade guard and positioned so as to enter the kerf formed by a circular blade mounted on said shaft;
  • a movable blade guard and other means mounting the same for swinging movement between open and closed positions about an axis parallel with said shaft and offset from the axis of rotation of the latter in a direction toward said kerf guide;
  • said movable blade guard being shaped such that in the closed position thereof it encloses both said kerf guide and a substantial number of the teeth on the lower portion of a circular blade mounted on said shaft.
  • said movable blade guard has a forward end which is engaged by the work being cut, said movable blade guard, when in the closed position thereof, cooperating with the fixed blade guard to enclose the entire periphery of a circular blade mounted on said shaft except for an approximate l0 sector defined by said forward end and the adjacent portion of the fixed blade guard.
  • said saw having a motor housing adjacent one side of said fixed blade guard;
  • connecting means extending between said member and said movable blade guard thereby to swing the latter about said axis upon pivoting movement of the former.
  • adjustment means supporting said kerf guide from said fixed blade guard, which adjustment means serves to permit mounting of the kerf guide in a plurality of positions in its own plane.
  • said adjustment means comprises:
  • one of said elements being mounted from said fixed blade guard adjacent the rearwardmost portion thereof, the other of said elements being connected to said kerf guide and mounting the same for movement in its own plane and also for rocking the same in said plane during such movement thereby permitting a predetermined spacing to be maintained between the distal end of the kerf guide and circular blades of different diameters.
  • one of said cam means and cam follower means consists of a pair of slots and the other of said cam means and cam follower means consists of a pair of fasteners slidably received in respective slots, the interengagement between said slots and said fasteners serving to impart said movements to said kerf guide.
  • slots are contained in a plane parallel to the plane of the blade and extend generally perpendicular to a radius of a circular blade of said shaft, which slots diverge in a generally upward direction.
  • a portable, power operated circular saw of the type having a motor driven, blade mounting shaft and a fixed blade guard adapted to enclose the teeth on the upper portion of a circular blade mounted on said shaft, and a movable blade guard adapted, in the closed position thereof, to enclose the teeth on the lower portion of such blade, the improvement comprising:
  • a kerf guide having a distal end and a leading edge surface adjacent thereto;
  • one of said elements being mounted adjacent the rearwardmost portion of said fixed blade guard, the other of said elements being connected to said kerf guide at the end thereof remote from said distal end and mounting the kerf guide so as to enter the kerf formed by a circular blade mounted on said shaft and with a predetermined spacing between said leading edge surface and the periphery of the blade and also with a predetermined distance of said distal end above the lowermost portion of said blade, said cam means and said cam follower means cooperating to permit movement of the kerf guide in its own plane, the interengagement between said cam means and said cam follower means causing said kerf guide to be rocked in its own plane, in response to such movement of the kerf guide, along a prescribed path thereby to maintain said predetermined spacing and said predetermined distance between the kerf guide and circular blades of different diameters.
  • one of said cam means and cam follower means consists of a pair of slots
  • the other of said cam means and cam follower means consists of a pair of fasteners slidably received in respective slots, said slots being in non-parallel relationship with each other.
  • a portable, power operated circular saw of the type having a motor driven, blade mounting shaft and a fixed blade guard adapted to enclose the teeth on the upper portion of a circular blade mounted on said shaft, and a movable blade guard adapted, in the closed position thereof, to enclose the teeth on the lower portion of iuch blade, the ⁇ m rovement comprising:
  • one of said elements being mounted from said fixed blade guard adjacent the rearwardmost portion thereof, the other of said elements being connected to said kerf guide and mounting the same so as to enter the kerf formed by a circular blade mounted on said shaft, said cam means and said cam follower means cooperating to permit movement of the kerf guide in its own plane and to rock the same in said plane during such movement thereby permitting a predetermined spacing to be maintained between the distal end of the kerf guide and circular blades of different diameters; and
  • said blade guard in the closed position thereof, enclosing said kerf guide and a substantial number of the teeth on the lower portion of a blade on said shaft.
  • said movable blade guard includes a forward end adapted to be engaged by the work being cut, said fixed blade guard and said movable blade guard, in the closed position of the latter, serving to enclose the entire periphery of a circular blade on said shaft except for an approximate 10 sector defined by said forward end and the adjacent portion of the fixed blade guard.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
US3701369D 1970-07-27 1970-07-27 Circular saw Expired - Lifetime US3701369A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US5853070A 1970-07-27 1970-07-27

Publications (1)

Publication Number Publication Date
US3701369A true US3701369A (en) 1972-10-31

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Application Number Title Priority Date Filing Date
US3701369D Expired - Lifetime US3701369A (en) 1970-07-27 1970-07-27 Circular saw

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US (1) US3701369A (de)
AU (1) AU454598B2 (de)
CH (1) CH538340A (de)
DE (1) DE2134990C3 (de)
FR (1) FR2103711A5 (de)
NL (1) NL156081B (de)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906266A (en) * 1974-02-22 1975-09-16 Black & Decker Mfg Co High inertia insulating cooling fan for electric motor device
US4693008A (en) * 1985-05-07 1987-09-15 Mallard Products, Incorporated Releasable separate member latching device for a portable hand tool
US5361501A (en) * 1993-08-23 1994-11-08 Aleksander Fajnsztajn Improved guard for power circular saw
US5396706A (en) * 1993-08-23 1995-03-14 Fajnsztajn; Aleksander Guard for portable circular saws
US5832614A (en) * 1997-05-20 1998-11-10 S-B Power Tool Company Remote lower guard lift lever mechanism for circular saws
US20020157265A1 (en) * 2001-04-26 2002-10-31 Makita Corporation Circular saw with an improved lower blade guard
US20040035005A1 (en) * 2002-08-26 2004-02-26 Hai-Ing Huang Electrical pruning shears
US20040244203A1 (en) * 2003-06-09 2004-12-09 Takaaki Otake Glass-cutting apparatus
US20080078090A1 (en) * 2006-05-19 2008-04-03 Johnson Charles E Iii Manual Saw Guard Retracting Device
US20080168667A1 (en) * 2005-11-02 2008-07-17 David Spinato Portable cutting device with guiding guard
US20090036043A1 (en) * 2007-07-30 2009-02-05 Hilti Aktiengesellschaft Cover device for a power tool
EP2098321A2 (de) * 2008-03-05 2009-09-09 BLACK & DECKER INC. Unterer Sägeblattschutz
CN101829809A (zh) * 2009-03-05 2010-09-15 美克司株式会社 携带用切断机
US20100236370A1 (en) * 2009-03-20 2010-09-23 Hassenboehler Jr Charles B Cutting aid for a motorized saw
US20160121513A1 (en) * 2014-10-30 2016-05-05 Robert Bosch Tool Corporation Lower Blade Guard for a Circular Saw
CN105970592A (zh) * 2016-07-19 2016-09-28 江苏工程职业技术学院 一种可自动保护的圆刀裁剪机
WO2017089192A1 (de) 2015-11-25 2017-06-01 Hilti Aktiengesellschaft Tragbare, handgeführte trennschleifmaschine
WO2017089169A1 (de) 2015-11-25 2017-06-01 Hilti Aktiengesellschaft Tragbare, handgeführte trennschleifmaschine
US11364652B2 (en) * 2019-09-03 2022-06-21 Makita Corporation Portable cutting machine
US11685017B2 (en) 2020-02-07 2023-06-27 West Bufkin Industries, Llc Storage shield for angle grinding disc

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3505041A1 (de) * 1985-02-14 1986-08-14 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Handkreissaege oder dergleichen elektrowerkzeug mit einem zweischalig ausgebildeten motor- und getriebegehaeuse
DE3912307A1 (de) * 1989-04-14 1990-10-25 Metabowerke Kg Kreissaege mit spaltkeil
US5007193A (en) * 1990-01-17 1991-04-16 E. I. Du Pont De Nemours And Company Fishing lure with improved elastomeric skirt
US20210354219A1 (en) * 2020-05-12 2021-11-18 Nanjing Chervon Industry Co., Ltd. Electric circular saw

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US816326A (en) * 1905-11-17 1906-03-27 Jacob Geo Hill Saw-guard.
US2346961A (en) * 1941-10-13 1944-04-18 Knapp Monarch Co Electric handsaw
US2801654A (en) * 1954-04-08 1957-08-06 Utz Friedrich Guard for motor-driven hand circular saw
US3221783A (en) * 1961-08-08 1965-12-07 Reich Maschf Gmbh Karl Circular saw with annular saw blade

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US816326A (en) * 1905-11-17 1906-03-27 Jacob Geo Hill Saw-guard.
US2346961A (en) * 1941-10-13 1944-04-18 Knapp Monarch Co Electric handsaw
US2801654A (en) * 1954-04-08 1957-08-06 Utz Friedrich Guard for motor-driven hand circular saw
US3221783A (en) * 1961-08-08 1965-12-07 Reich Maschf Gmbh Karl Circular saw with annular saw blade

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906266A (en) * 1974-02-22 1975-09-16 Black & Decker Mfg Co High inertia insulating cooling fan for electric motor device
US4693008A (en) * 1985-05-07 1987-09-15 Mallard Products, Incorporated Releasable separate member latching device for a portable hand tool
US5361501A (en) * 1993-08-23 1994-11-08 Aleksander Fajnsztajn Improved guard for power circular saw
US5396706A (en) * 1993-08-23 1995-03-14 Fajnsztajn; Aleksander Guard for portable circular saws
US5832614A (en) * 1997-05-20 1998-11-10 S-B Power Tool Company Remote lower guard lift lever mechanism for circular saws
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
US20040035005A1 (en) * 2002-08-26 2004-02-26 Hai-Ing Huang Electrical pruning shears
US20040244203A1 (en) * 2003-06-09 2004-12-09 Takaaki Otake Glass-cutting apparatus
US7207115B2 (en) * 2003-06-09 2007-04-24 Fuji Jukogyo Kabushiki Kaisha Glass-cutting apparatus
US20080168667A1 (en) * 2005-11-02 2008-07-17 David Spinato Portable cutting device with guiding guard
US20080078090A1 (en) * 2006-05-19 2008-04-03 Johnson Charles E Iii Manual Saw Guard Retracting Device
US7980924B2 (en) * 2007-07-30 2011-07-19 Hilti Aktiengesellschaft Cover device for a power tool
US20090036043A1 (en) * 2007-07-30 2009-02-05 Hilti Aktiengesellschaft Cover device for a power tool
EP2098321A2 (de) * 2008-03-05 2009-09-09 BLACK & DECKER INC. Unterer Sägeblattschutz
EP2098321A3 (de) * 2008-03-05 2014-01-01 Black & Decker Inc. Unterer Sägeblattschutz
CN101829809A (zh) * 2009-03-05 2010-09-15 美克司株式会社 携带用切断机
JP2010201599A (ja) * 2009-03-05 2010-09-16 Max Co Ltd 携帯用切断機
US8726526B2 (en) 2009-03-05 2014-05-20 Max Co., Ltd. Portable cutting machine
US20100236370A1 (en) * 2009-03-20 2010-09-23 Hassenboehler Jr Charles B Cutting aid for a motorized saw
US20160121513A1 (en) * 2014-10-30 2016-05-05 Robert Bosch Tool Corporation Lower Blade Guard for a Circular Saw
WO2017089192A1 (de) 2015-11-25 2017-06-01 Hilti Aktiengesellschaft Tragbare, handgeführte trennschleifmaschine
WO2017089169A1 (de) 2015-11-25 2017-06-01 Hilti Aktiengesellschaft Tragbare, handgeführte trennschleifmaschine
EP3380272B1 (de) * 2015-11-25 2023-07-05 Hilti Aktiengesellschaft Tragbare, handgeführte trennschleifmaschine
CN105970592A (zh) * 2016-07-19 2016-09-28 江苏工程职业技术学院 一种可自动保护的圆刀裁剪机
CN105970592B (zh) * 2016-07-19 2018-04-10 江苏工程职业技术学院 一种可自动保护的圆刀裁剪机
US11364652B2 (en) * 2019-09-03 2022-06-21 Makita Corporation Portable cutting machine
US11685017B2 (en) 2020-02-07 2023-06-27 West Bufkin Industries, Llc Storage shield for angle grinding disc

Also Published As

Publication number Publication date
DE2134990A1 (de) 1972-02-03
AU3168971A (en) 1973-02-01
CH538340A (de) 1973-06-30
DE2134990C3 (de) 1980-06-26
NL7110260A (de) 1972-01-31
NL156081B (nl) 1978-03-15
DE2134990B2 (de) 1979-10-11
FR2103711A5 (de) 1972-04-14
AU454598B2 (en) 1974-10-31

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