|Publication number||US2963056 A|
|Publication date||Dec 6, 1960|
|Filing date||Jun 5, 1958|
|Priority date||Jun 5, 1958|
|Publication number||US 2963056 A, US 2963056A, US-A-2963056, US2963056 A, US2963056A|
|Inventors||Rickford Vernon W|
|Original Assignee||Rickford Vernon W|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (3), Referenced by (17), Classifications (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Dec. 6, 1960 v. w. RICKFORD 2,963,056
ELECTRIC SAW SAFETY GUARD RETRACTOR Filed June 5, 1958 fa w FILE: .2
INVENTOR. VERA/04! M R/CKFwED ww ww 4 fromvEys United States PatentO 2,963,056 v ELECTRIC SAW SAFETY GUARD, RETRACTOR Vernon W. Rickford, 1905 th Ave. S.,
' Minneapolis, Minn.
Filed June s, 1958, Ser. No. 740,149
2 Claims. or. 143-159 The invention herein has relation to a new and improved construction and arrangement for retracting a.
Fig. 1 is a side elevational view, partially broken away and partially in section, of an electric saw including retracting mechanism made according to the invention;
Fig. 2 is an'end elevational view of the disclosure of ;Fig. l as it would appear from the right; anda Fig. 3 is a fragmentary view, partially in elevation'a'nd partially in section, detailing features and characteristics of the new and improved retracting mechanism of the invention.
Referring to the drawing and the numerals of reference thereon, 10 denotes the base of an electric saw and 11 represents a circular blade thereof suitably and conveniently rotatably mounted, as at 12, on a frame upon said base. The circular blade includes cutting teeth 13 and is to be rotated in the direction of the arrow in Fig. 1. Said circular blade is substantially in perpendicular relation to the base of the electric saw at a side thereof and a portion of the circular blade extends to position below said base, as disclosed in said Fig. 1 and in Fig. 2.
A curvilinear upper guard 14, part-circular in cross section, for the circular blade 11, suitably and conveniently supported on the frame of the electric saw, is in spaced covering and protecting relation to the cutting teeth 13 on an upper peripheral portion of said circular blade.
A manipulating handle 15 of the circular saw, situated upwardly of the upper guard 14 at a side thereof and in a vertical plane including the base 10, includes rearward and forward ends integral, as at 16, with a rearward and an intermediate portion of the frame. A body of the manipulating handle is in spaced relation to said frame.
Spaced, parallel rigid strips 17, in perpendicular relation to the base 10, are secured to opposite side surfaces of a forward portion of the manipulating handle and extend forwardly thereof. A finger control switch on said manipulating handle is designated 38.
A lower guard 18 for the circular blade 11, normally in spaced covering and protecting relation to cutting teeth 13 on a lower peripheral portion of said circular blade, includes an elongated circumferential portion, partcircular in cross-section, and an inwardly extending flange 19 rotatably mounted, as at 20, on and about the axis for said circular blade. The inwardly extending flange 19 of the lower guard 18 is integral with an inner side edge of the elongated circumferential portion of said lower guard, and the lower guard is of less width than is the upper guard 14 to lie between the opposite side portions of said upper guard in clearing relation thereto. Said lower guard is substantially in perpendicular relation to the base 10 and the peripheral portion of the upper guard is spaced at greater distance from the axis for the Patented Dec. 6, 1960 inwardly extending flange of the lower guard than is the peripheral surface of said lower guard.
A coil spring 21, having one of its ends attached, as at 22, to the frame of the electric saw and its other end attached, as at 23, to the lower guard, normally resiliently retains said lower guard in spaced covering and protecting relation to cutting teeth on the lower peripheral portion of the circular blade, as in Fig. 1 of the drawing. A stop element 24, engageable by a forward edge of the inwardly extending flange 19 of the lower guard, limits the extent to which said lower guard can swing forwardly, in counterclockwise direction as shown.
Means, denoted generally at 25, is included for adjusting the angular relationship of the base 10 and the circular blade 11. The means 25 forms no part of the present invention.
An electric saw of construction as hereinbefore def scribed is well known to the art. In practice, the lower guard, such as 18, of the electric saw normally is rotated. aginSt force of a resilient means, such as the coil spring 21, thereof from a position where in spaced covering and protecting relation to cutting teeth on the lower peripheral portion of a circular blade, such as 11, as in full lines in Fig. 1, to a position where said lower peripheral portion isexposed, as in dotted lines in said Fig. 1 merely by advancement of thelower forward end of said lower guard into the work. The coil spring 21 operates to return the lower guard to its normal position upon release of said lower guard from the work.
It is essential, in some instances of practical operation of a circular saw, that the lower guard, such as 18, thereof be manually rotated from position where in spaced covering and protecting relation to the lower or cutting portion of the circular blade, such as 11, to position where clear of said lower or cutting portion. The novel and improved construction and arrangement of the invention is for manually rotating the lower guard 18 from its operative position, as in full lines in Fig. 1 of the drawing, to its inoperative position, as in dotted lines in said Fig. 1, against force of the coil spring 21, or other resilient means.
The midportion of a shaft 26, substantially parallel to the base 10, is rotatably mounted, as at 27, in the spaced, parallel strips 17, and opposite end portions, denoted 28 and 29, respectively, of said shaft extend to position beyond said strips, respectively. Such shaft is disposed generally between the saw arbor and the handle. A crank arm 30 is in perpendicular relation to and rigid with the end portion 28 of the shaft 26, and a lever arm 31 is in perpendicular relation to said shaft and integral with its end portion 29. The lever arm 31 extends forwardly from the exterior end of the end portion 29 of the shaft 26, and the crank arm 30 extends upwardly from the exterior end of the end portion 28 of said shaft.
A link 32, movable in a vertical elongated slot 33 in the upper guard, is supported, as at 34, for movement of rotation on an outer end portion of the lever arm 31 to extend downwardly of the shaft 26. A lower end of the link 32 is pivotally attached, as at 35, to the upper end of a hook member 36, and the lower end of said hook member is pivotally attached, as at 37, to a part of the flange 19 of the lower guard 18 at a location in spaced relation to the axis of or for said lower guard. The lever arm 31 and the link 32 are to be retained in fixed angular relation to each other in direction longitudinally of said lever arm.
It will be evident that the lower guard 18 will be swung from the full line position to the dotted line position in which disclosed in Fig. 1 of the drawing in response to manual rearward swinging movement of the crank arm 30, through the instrumentality of the lever arm 31, the link 32 and the hook member 36, and the coil spring 21 will return said lower guard to its normal position upon release of said crank arm. The crank arm is accessible at a location adjacent to the manipulating handle 15 to be manually actuable by the fingers of the hand that retains said manipulating handle, leaving the other hand free for other usual and necessary manual operations.
What is claimed is:
1. A manual saw guard retracting actuator for a handheld portable power circular saw frame having a saw arbor rotating about an axis extending transversely of a pistol grip handle and a saw blade guard mounted on the frame for circumferential swinging movement concentric with the saw arbor axis upward toward the handle in retracting from a position covering the cutting segment of the saw blade, which saw guard retracting actuator comprises a shaft rotatable about its axis, extending substantially parallel to the saw arbor, and disposed at the same side of the saw arbor as the handle, a first arm in fixed angular relation to said shaft, extending generally toward the saw arbor and swingable generally in a plane transversely of the arbor by rotation of said shaft, means connecting the swinging end of said first arm and the saw guard for effecting retracting movement of the guard by swinging of said arm, and a second arm projecting transversely from said shaft to a position alongside the handle for voluntary manual swinging to rotate said shaft in guard-retracting direction.
2. A manual saw guard retracting actuator for a handheld portable power circular saw frame having a saw arbor rotating about an axis extending transversely of a pistol grip handle and a saw blade guard mounted on the frame for circumferential swinging movement concentric with the saw arbor axis upward toward the handle in retracting from a position covering the cutting segment of the saw blade, which saw guard retracting actuator comprises a shaft rotatable about its axis, extending substantially parallel to the saw arbor, and disposed generally between the saw arbor and the handle, a first arm in fixed angular relation to said shaft at one end thereof, extending generally toward the saw arbor and swingable generally in a plane transversely of the arbor by rotation of said shaft, means connecting the swinging end of said first arm and the saw guard for eifecting retracting movement of the guard by swinging of said arm, a second arm projecting transversely of said shaft from the other end portion thereof and extending generally toward the handle and away from the arbor, and a thumb-engageable projection extending from said second arm transversely thereof to a position alongside the handle for voluntary manual swinging to rotate said shaft in guard-retracting direction.
References Cited in the file of this patent UNITED STATES PATENTS 1,102,018 Dodds June 30, 1914 2,342,052 Jimerson et al. Feb. 15, 1944 2,737,985 Utz Mar. 13, 1956
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US1102018 *||Jun 6, 1912||Jun 30, 1914||Power-driven handsaw.|
|US2342052 *||Feb 21, 1942||Feb 15, 1944||Ingersoll Rand Co||Portable cutting tool|
|US2737985 *||Apr 22, 1952||Mar 13, 1956||Friedrich Utz||Guards for motor hand saws|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3262472 *||May 8, 1964||Jul 26, 1966||Black & Decker Mfg Co||Depth and bevel adjustment means for portable power-driven saw|
|US3262473 *||May 11, 1964||Jul 26, 1966||Black & Decker Mfg Co||Positioning linkage for rotatably mounted upper guard of portable power-driven saw|
|US3382578 *||May 11, 1966||May 14, 1968||Gunther Heinrich Wilhelm Dobbertin||Portable cutting tools|
|US3706332 *||Jan 13, 1971||Dec 19, 1972||Black & Decker Mfg Co||Circular saw guard and linkage|
|US3730239 *||Dec 10, 1971||May 1, 1973||Skil Corp||Circular saw with improved movable guard construction|
|US5075976 *||Feb 5, 1991||Dec 31, 1991||Young Peter W||Power tool guard retainer|
|US5481806 *||Jun 27, 1994||Jan 9, 1996||Pratt; Edgar L.||Tongue attachment for circular saw|
|US5699705 *||Dec 4, 1995||Dec 23, 1997||Sibbet; Donald Dale||Powered circular saw retention apparatus for retractable saw blade guard|
|US5832614 *||May 20, 1997||Nov 10, 1998||S-B Power Tool Company||Remote lower guard lift lever mechanism for circular saws|
|US5873169 *||Jun 25, 1997||Feb 23, 1999||Milwaukee Electric Tool Corporation||Blade guard stop for a circular saw|
|US7426787 *||Jun 15, 2006||Sep 23, 2008||Sj2 Industries, Llc||Retractor for circular saw lower safety-guard|
|US7832072||Jul 21, 2008||Nov 16, 2010||Sj2 Industries, Llc||Method of retrofitting a circular saw|
|US20050252012 *||May 11, 2004||Nov 17, 2005||Johnson Charles E Iii||Manual saw guard retracting apparatus|
|US20070022852 *||Jun 15, 2006||Feb 1, 2007||Tracy Jack R||Retractor for circular saw lower safety-guard|
|US20080271310 *||Jul 21, 2008||Nov 6, 2008||Tracy Jack R||Method of retrofitting a circular saw|
|EP1928636A2 *||Sep 8, 2006||Jun 11, 2008||SJ2 Industries, LLC||Retractor for circular saw lower safety-guard|
|EP1928636A4 *||Sep 8, 2006||Dec 3, 2008||Sj2 Ind Llc||Retractor for circular saw lower safety-guard|
|U.S. Classification||83/391, 30/391|
|International Classification||B27G19/00, B27G19/04|