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Publication numberUS1132129 A
Publication typeGrant
Publication dateMar 16, 1915
Filing dateJun 15, 1914
Priority dateJun 15, 1914
Publication numberUS 1132129 A, US 1132129A, US-A-1132129, US1132129 A, US1132129A
InventorsFred M Stevens
Original AssigneeFred M Stevens
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Safety-grip for circular saws.
US 1132129 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

F. M. STEVENS. SAFETY GRIP FOR CIRCULAR SAWS.

APPLIOATION FILED JUNE 15, 1914.

1,132,129. Patented Mar. 16, 1915.

-1HE NORRIS PETERS c0. PHOTCVLITHO WASHINGTON. D. c,

llldlTFdD FATFil lT @FFlQE FRED M. STEVENS, 0F CAMBRIDGE, MASSACHUSETTS.

SAFETY-GRIP FOR CIRCULAR SAWS.

Application filed June 15, 191 1.

To aw whom it may concern Be it known that 1, Fnno M. STEVENS, a citizen of the United States, and resident of Cambridge, in the county of Middlesex and State of Massachusetts, have invented new and useful improvements in Safety- Grips for Circular Saws, of which the following is a specification.

1n the operation of circular splitting saws there is constant danger that the piece of wood being sawed will bethrown back toward the operator by the swiftly rotating saw, especially if the piece is not held firmly and steadily while it is being advanced past the saw. when a piece is so thrown back it is projected with tremendous force and with serious and sometimes fatal consequences to the operator.

The object of the present invention is to provide an automatic safety grip for use in connection with circular splitting saws adapted to permit the free forward movement of the stick or piece being sawed but to prevent the possibility of its being thrown backward by the saw.

In the accompanying drawings which illustrate one embodiment of the invention,Figure 1 is a side elevation of the device applied to a circular splitting saw; Fig. 2 is a plan view of the parts shown in Fig. 1; Fig. 3 is a plan view of the safety grip folded and latched back in inoperative position; Fig. i is a rear elevation of said safety grip; Fig. 5 is a rear elevation of the grip folded and latched back in inoperative position; and Fig. 6 is a section on line 66 of Fig. 1.

Referring to the drawings, A represents the circular saw table made with a slot or through which projects the circular splitting saw S; B is the usual gage of cast iron or hard wood mounted on the saw table at the side of the saw to determine the width of the strip to be sawed; and M represents the piece of material, such as a stick of wood, being sawed.

The safety grip as herein illustrated is secured to the end of the gage B and consists of a plate divided into two sections 1 and 2, the plate section 1 having an 0&- set shoulder part 3 which is rigidly fastened by bolts 4: to the gage B so that the face of Patented Mar. 16, 1e15,.

Serial No. 845,990.

the plate section 1 and the face of the gage B lie in the same plane. The other plate section 2 is hinged to the plate section 1 by a pivoted rod 5 which passes through ears or lugs 6, 6, projecting from the rear sides of the plate sections 1 and 2. A coil spring 7 surrounds rod 5 and normally urges the swinging plate section 2 into operative or extended position as shown in Figs. 1, 2 and 4. Pivoted to the shoulder of the off set part 3 of plate section 1 is a latch 8, adapted to engage the catch 10 projecting from the rear side of plate section 2. When the plate section 2 is folded back upon plate section 1 the latch 8, which is normally pressed forward by spring 9, will automatically engage the catch 10, holding the swinging plate section 2 in folded or inoperative position. Thus, the grip may be thrown out of action if it is desired to use the saw without the grip, and without dismounting the fixed section 1 by removing bolt 4. The latch 8 is made with a nose 11 which limits the movement of the latch in its forward or downward direction.

On the front side of plate section 2 is supported the gripping dog 12, normally in the path of the material M, provided with a series of teeth or corrugations to grip the top surface of the material M. The gripping dog 12 is provided with an upwardly extending arm 13, and is carried and actuated by a pair of parallel arms 1% and 15, arranged one above the other, and each pivoted at one end to the swinging plate section 2 and at the other end to the upright arm 13. A spring 16 secured at one end to the upright arm 18 by pin 17 and at the other end of the swinging arm 15 by pin 18, normally tends to urge the gripping dog 12 downward in the direction of the material M. It will be seen that the gripping dog is adapted to operate in conjunction with sticks of various thickness and that in all positions of elevation within the range of its movement the angle of the gripping dog in relation to the surface of the material M will remain unchanged on account of the action of the parallel arms 14 and 15. It will also be observed that the bottom surface of the gripping dog is inclined to the direction of movement of the material M, as is also the bottom surface of the actuating arm. 15, so that as the material M is moved forward its leading end will first engage the bottom side of arm 15 thereby raising said arm and the gripping dog 12, and upon its continued movement the leading end of the material M will slip past the under surface of arm 15 and engage the inclined bottom surface of the dog 12, causing the same to ride up on top of the material, with its gripping edge in engagement with the top surface of the material as shown in Fig. 1. For convenience in elevating the dog 12 manually, should that be desired, the upper arm 14: is provided with a rearwardly projecting handle 19, which may be swung down into notch 20, in plate section 1, in order not to limit the upward movement of the dog.

The operation will be apparent from the foregoing description without further eX- planation. It will be seen that as soon as the forward end of the material being sawed passes underneath the gripping dog,v the latter will hold it against any possibility of flying back in the direction of rotation of the saw, and that the greater the tendency to fly back the greater will be the gripping action exerted by the dog 12. It will also be clear that the form of the dog is such as to permit the free forward movement of the material.

In case the safety grip is to be thrown out of action as above described, it will be observed by reference to Figs. 4: and 5 that the pivotal connection between the swinging plate section 2 and the fixed plate section 1 is upon an inclined axis so that as the swinging section 2 is folded backwardly upon section 1, it will rise clear of the saw table and thus pass over any sawdust or dirt which may accumulate upon the table.

Not only does my safety grip prevent the material from being thrown backward by the saw, but it enables the operator to push the stock through much faster than without the grip, since it is not necessary to finish and remove one piece of material before starting another, but each piece of stock may be pushed through by the piece following, and the gripping dog will hold and aid in guiding the material after it leaves the hand of the operator, and while it isbeing pushed forward by the next succeeding piece.

I claim: 1

1. In combination with a circular saw, a gage at the side of the saw, a gripping dog mounted at the end of the gage normally in the path of the material to be sawed, and pivotal connection between the dog and the gageadapted to permit the dog to be swung on the gage into inoperative position out of the path of the material.

2. In combination with a circular saw, a

gage at the side of the saw, a gripping dog, a support for said dog on which said dog is movably mounted, and hinged connec- 1 tion between said support and the gage adapted to permit the support and dog to be swung on the gage into inoperative position out of the path of the material.

3. In combination with'a circular saw, a

gage at the side of the saw, a gripping dog,

hinged to said gage for horizontal movement, means for engaging the support for urging the same in line with the material to be sawed, a gripping dog movable on the support and means engaging the dog to urge the same against the material when said support'is in line therewith.

5. In combination with a circular saw,

and a gage at one end thereof, of a support hinged to the gage, a dog on the support, a spring connected to the support for urging the same into line with the material to be sawed whereby to engage the dog with saidmaterial, the support being adapted to be swung out of line with the material and means for retaining the support in such'latter position. v v

6. A safety grip for circular saws adapted to be mounted on a circular saw table, comprising a gripping dog having an inclined bottom surface and an upright arm,

a vertical support for said dog, a pair of c arms working in parallelismeach pivoted at one end to the upright arm, and at the other to said support, whereby the relation of thegripping dog to the surface of the material to be sawed remains substantially unchanged in all the positions of the grip ping dog, said parallel arms normally extending downwardly toward the table whereby the end of the incoming piece of material to be sawed may successively engage the inclined surface of the 'lower parallel arm and the inclined surface of the gripping dogto lift the same and thereby admit the material to pass under the dog.

7. A safety grip for circular'saws adapted to be mounted on a circularsaw table, comprising a gripping dog having an inclined bottom surface and an upright arm, a vertical support for said dog,a pair of arms working in parallelism each pivoted at one end to the upright arm, and at the other to said support, whereby the relation .of the gripping dog to the surface of the material fed to the same for gradually raising the dog from the table.

Signed by me at Boston, Massachusetts, this 11th day of June, 1914:.

FRED M. STEVENS.

material to be sawed remains substantially unchanged in all the positions of the gripping dog, said parallel arms normally extending downwardly toward the table whereby the lower edge of the lower arm lies substantially in alinement with the beveled edge of the dog to provide a substantially uninterrupted cam surface for engagement with l/Vitnesses:

ROBERT CUSHMAN, FLORENCE A. COLLINS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents,

Washington, D. G.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3062249 *Apr 3, 1961Nov 6, 1962Gray David RSingle pass log sawing machine
US4615247 *Sep 13, 1985Oct 7, 1986Shopsmith, Inc.Anti-kickback system
US6009785 *Nov 7, 1996Jan 4, 2000Meto International GmbhCutting mechanism for a traveling web
US6857345Aug 13, 2001Feb 22, 2005Sd3, LlcBrake positioning system
US6877410Jan 15, 2002Apr 12, 2005Sd3, LlcMiter saw with improved safety system
US6920814Aug 13, 2001Jul 26, 2005Sd3, LlcCutting tool safety system
US6945149Jul 25, 2002Sep 20, 2005Sd3, LlcActuators for use in fast-acting safety systems
US6997090Feb 23, 2004Feb 14, 2006Sd3, LlcSafety systems for power equipment
US7024975Aug 13, 2001Apr 11, 2006Sd3, LlcBrake mechanism for power equipment
US7055417Sep 29, 2000Jun 6, 2006Sd3, LlcSafety system for power equipment
US7100483Aug 13, 2001Sep 5, 2006Sd3, LlcFiring subsystem for use in a fast-acting safety system
US7137326Aug 13, 2001Nov 21, 2006Sd3, LlcTranslation stop for use in power equipment
US7171879Jul 2, 2002Feb 6, 2007Sd3, LlcDiscrete proximity detection system
US7210383Aug 13, 2001May 1, 2007Sd3, LlcDetection system for power equipment
US7225712Aug 13, 2001Jun 5, 2007Sd3, LlcMotion detecting system for use in a safety system for power equipment
US7228772Feb 18, 2005Jun 12, 2007Sd3, LlcBrake positioning system
US7284467Aug 13, 2001Oct 23, 2007Sd3, LlcApparatus and method for detecting dangerous conditions in power equipment
US7290472Sep 1, 2004Nov 6, 2007Sd3, LlcMiter saw with improved safety system
US7308843Aug 13, 2001Dec 18, 2007Sd3, LlcSpring-biased brake mechanism for power equipment
US7347131Jun 2, 2006Mar 25, 2008Sd3, LlcMiter saw with improved safety system
US7347851Mar 9, 2004Mar 25, 2008Leo B KriksunovNeedleless hypodermic jet injector apparatus and method
US7350444Aug 13, 2001Apr 1, 2008Sd3, LlcTable saw with improved safety system
US7350445Aug 20, 2004Apr 1, 2008Sd3, LlcBrake cartridge for power equipment
US7353737Apr 4, 2005Apr 8, 2008Sd3, LlcMiter saw with improved safety system
US7357056Jul 25, 2005Apr 15, 2008Sd3, LlcCutting tool safety system
US7359174Aug 18, 2006Apr 15, 2008Sd3, LlcMotion detecting system for use in a safety system for power equipment
US7421315Jul 17, 2006Sep 2, 2008Sd3, LlcDetection system for power equipment
US7472634Aug 20, 2004Jan 6, 2009Sd3, LlcWoodworking machines with overmolded arbors
US7481140Apr 15, 2005Jan 27, 2009Sd3, LlcDetection systems for power equipment
US7509899Aug 13, 2001Mar 31, 2009Sd3, LlcRetraction system for use in power equipment
US7525055Apr 11, 2006Apr 28, 2009Sd3, LlcSwitch box for power tools with safety systems
US7536238Dec 31, 2004May 19, 2009Sd3, LlcDetection systems for power equipment
US7591210Feb 5, 2007Sep 22, 2009Sd3, LlcDiscrete proximity detection system
US7600455Oct 13, 2009Sd3, LlcLogic control for fast-acting safety system
US7621205Nov 24, 2009Sd3, LlcBand saw with safety system
US7681479Mar 23, 2010Sd3, LlcMotion detecting system for use in a safety system for power equipment
US7707920Dec 31, 2004May 4, 2010Sd3, LlcTable saws with safety systems
US7712403Jul 2, 2002May 11, 2010Sd3, LlcActuators for use in fast-acting safety systems
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US7788999Apr 10, 2006Sep 7, 2010Sd3, LlcBrake mechanism for power equipment
US7827890Nov 9, 2010Sd3, LlcTable saws with safety systems and systems to mount and index attachments
US7827893Mar 14, 2007Nov 9, 2010Sd3, LlcElevation mechanism for table saws
US7832314Nov 16, 2010Sd3, LlcBrake positioning system
US7836804Dec 29, 2006Nov 23, 2010Sd3, LlcWoodworking machines with overmolded arbors
US7866239Mar 14, 2007Jan 11, 2011Sd3, LlcElevation mechanism for table saws
US7895927May 19, 2010Mar 1, 2011Sd3, LlcPower equipment with detection and reaction systems
US7921754Apr 12, 2011Sd3, LlcLogic control for fast-acting safety system
US7991503May 18, 2009Aug 2, 2011Sd3, LlcDetection systems for power equipment
US8061245Nov 22, 2011Sd3, LlcSafety methods for use in power equipment
US8065943Nov 29, 2011Sd3, LlcTranslation stop for use in power equipment
US8087438Jan 3, 2012Sd3, LlcDetection systems for power equipment
US8100039Apr 19, 2010Jan 24, 2012Sd3, LlcMiter saw with safety system
US8122807May 3, 2010Feb 28, 2012Sd3, LlcTable saws with safety systems
US8151675Mar 31, 2011Apr 10, 2012Sd3, LlcLogic control for fast-acting safety system
US8186255Nov 16, 2009May 29, 2012Sd3, LlcContact detection system for power equipment
US8191450Aug 20, 2010Jun 5, 2012Sd3, LlcPower equipment with detection and reaction systems
US8196499Aug 20, 2010Jun 12, 2012Sd3, LlcPower equipment with detection and reaction systems
US8408106Apr 2, 2013Sd3, LlcMethod of operating power equipment with detection and reaction systems
US8459157Jun 11, 2013Sd3, LlcBrake cartridges and mounting systems for brake cartridges
US8489223Dec 23, 2011Jul 16, 2013Sd3, LlcDetection systems for power equipment
US8498732Dec 19, 2011Jul 30, 2013Sd3, LlcDetection systems for power equipment
US8505424Nov 8, 2010Aug 13, 2013Sd3, LlcTable saws with safety systems and systems to mount and index attachments
US8522655Apr 9, 2012Sep 3, 2013Sd3, LlcLogic control for fast-acting safety system
US9038515Aug 29, 2013May 26, 2015Sd3, LlcLogic control for fast-acting safety system
US20020017175 *Aug 13, 2001Feb 14, 2002Gass Stephen F.Translation stop for use in power equipment
US20020017178 *Aug 13, 2001Feb 14, 2002Gass Stephen F.Motion detecting system for use in a safety system for power equipment
US20020017179 *Aug 13, 2001Feb 14, 2002Gass Stephen F.Miter saw with improved safety system
US20020017180 *Aug 13, 2001Feb 14, 2002Gass Stephen F.Brake mechanism for power equipment
US20020017181 *Aug 13, 2001Feb 14, 2002Gass Stephen F.Retraction system for use in power equipment
US20020017182 *Aug 13, 2001Feb 14, 2002Gass Stephen F.Brake positioning system
US20020017183 *Aug 13, 2001Feb 14, 2002Gass Stephen F.Cutting tool safety system
US20020020262 *Aug 13, 2001Feb 21, 2002Gass Stephen F.Logic control for fast-acting safety system
US20020020263 *Aug 13, 2001Feb 21, 2002Gass Stephen F.Firing subsystem for use in a fast-acting safety system
US20020020271 *Aug 13, 2001Feb 21, 2002Gass Stephen F.Spring-biased brake mechanism for power equipment
US20020056348 *Jan 14, 2002May 16, 2002Gass Stephen F.Miter saw with improved safety system
US20020056349 *Jan 14, 2002May 16, 2002Gass Stephen F.Miter saw with improved safety system
US20020056350 *Jan 16, 2002May 16, 2002Gass Stephen F.Table saw with improved safety system
US20020059853 *Jan 16, 2002May 23, 2002Gass Stephen F.Power saw with improved safety system
US20020059855 *Jan 16, 2002May 23, 2002Gass Stephen F.Miter saw with improved safety system
US20020066346 *Jan 15, 2002Jun 6, 2002Gass Stephen F.Miter saw with improved safety system
US20020170399 *Mar 13, 2002Nov 21, 2002Gass Stephen F.Safety systems for power equipment
US20020170400 *May 15, 2002Nov 21, 2002Gass Stephen F.Band saw with improved safety system
US20030015253 *Jul 18, 2002Jan 23, 2003Gass Stephen F.Router with improved safety system
US20030019341 *Jul 25, 2002Jan 30, 2003Gass Stephen F.Safety systems for band saws
US20030037651 *Aug 9, 2002Feb 27, 2003Gass Stephen F.Safety systems for power equipment
US20030056853 *Sep 20, 2002Mar 27, 2003Gass Stephen F.Router with improved safety system
US20030058121 *Sep 13, 2002Mar 27, 2003Gass Stephen F.Logic control with test mode for fast-acting safety system
US20030090224 *Nov 12, 2002May 15, 2003Gass Stephen F.Detection system for power equipment
US20030131703 *Jan 15, 2003Jul 17, 2003Gass Stephen F.Apparatus and method for detecting dangerous conditions in power equipment
US20030140749 *Jan 13, 2003Jul 31, 2003Gass Stephen F.Brake Pawls for power equipment
US20040040426 *Aug 18, 2003Mar 4, 2004Gass Stephen F.Miter saw with improved safety system
US20040163514 *Feb 23, 2004Aug 26, 2004Gass Stephen F.Safety systems for power equipment
US20040173430 *Mar 4, 2004Sep 9, 2004Gass Stephen F.Retraction system and motor position for use with safety systems for power equipment
US20050039586 *Aug 20, 2004Feb 24, 2005Gass Stephen F.Brake cartridges for power equipment
US20050039822 *Aug 20, 2004Feb 24, 2005Gass Stephen F.Woodworking machines with overmolded arbors
US20050041359 *Aug 20, 2004Feb 24, 2005Gass Stephen F.Motion detecting system for use in a safety system for power equipment
US20050139051 *Feb 18, 2005Jun 30, 2005Gass Stephen F.Brake positioning system
US20050139057 *Dec 31, 2004Jun 30, 2005Gass Stephen F.Table saws with safety systems
US20050139058 *Dec 31, 2004Jun 30, 2005Gass Stephen F.Brake cartridges and mounting systems for brake cartridges
US20050139459 *Dec 31, 2004Jun 30, 2005Gass Stephen F.Switch box for power tools with safety systems
US20050155473 *Dec 31, 2004Jul 21, 2005Gass Stephen F.Dectection systems for power equipment
US20050178259 *Apr 4, 2005Aug 18, 2005Gass Stephen F.Miter saw with improved safety system
US20050204885 *Sep 1, 2004Sep 22, 2005Gass Stephen FMiter saw with improved safety system
US20050252187 *Jul 25, 2005Nov 17, 2005Gass Stephen FCutting tool safety system
US20050274432 *Aug 19, 2005Dec 15, 2005Gass Stephen FRouter with improved safety system
US20060000337 *Sep 2, 2005Jan 5, 2006Gass Stephen FBand saw with safety system
US20060032352 *Oct 24, 2005Feb 16, 2006Gass Stephen FTranslation stop for use in power equipment
US20060123960 *Feb 13, 2006Jun 15, 2006Gass Stephen FSafety systems for power equipment
US20060123964 *Feb 6, 2006Jun 15, 2006Gass Stephen FTable saw with improved safety system
US20060247795 *Apr 15, 2005Nov 2, 2006Gass Stephen FDetection systems for power equipment
US20070240786 *Jun 4, 2007Oct 18, 2007Gass Stephen FMotion detecting system for use in a safety system for power equipment
US20100089212 *Oct 9, 2009Apr 15, 2010Gass Stephen FLogic control for fast-acting safety system
Classifications
U.S. Classification83/440.2, 83/447
Cooperative ClassificationB27G19/02