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Publication numberUS3785230 A
Publication typeGrant
Publication dateJan 15, 1974
Filing dateNov 8, 1972
Priority dateNov 8, 1972
Publication numberUS 3785230 A, US 3785230A, US-A-3785230, US3785230 A, US3785230A
InventorsLokey R
Original AssigneeLokey Tool Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Automatic safety brake for rotary blade equipment
US 3785230 A
Abstract
An automatic safety brake for rotary blade equipment in which a capacitance proximity sensor utilizes the spinning blade as an antenna so that when any portion of the body of the user approaches the blade to closely a cam brake will be instantaneously actuated to stop the rotation of the blade before the body of the user comes in contact with the cutting edge of the blade. In one form of the invention cam members are applied to opposite side faces of the blade to serve as a brake for the instanteous stopping of the rotation of the blade. In another form of the invention a rubber wedge is driven into the cutting edge of the blade so as to instantaneously stop the rotation of the blade. In both forms of the invention the sensitivity of the sensor may be adjusted to suit the capacitance effect of the individual user of the equipment.
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Description  (OCR text may contain errors)

Lokey AUTOMATIC SAFETY BRAKE FOR ROTARY BLADE EQUIPMENT [75] Inventor: Robert C. Lokey, Tamal, Calif. [73] Assignee: Lokey Tool, Inc., San Leandro,

[57 ABSTRACT [22] Filed: 1972 An automatic safety brake for rotary blade equipment 21 APPL 304 72 in which a capacitance proximity sensor utilizes the spinning blade as an antenna so that when any portion of the body of the user approaches the blade to closely [52] U.S. Cl 83/58, 30/390, 192/129 A, Cam brake Will be instantaneously actuated to Stop 192/130" 192/144 3l7/DIG' 2 the rotation of the blade before the body of the user [5 l llll. Cl 827]] 19/02, B27h 19/04 comes in Contact with the cutting edge of the blade In [58] Field of Search 408/710; 82/34 R; one form of the invention Cam members are applied to 30/390 83/72 58; opposite side faces of the blade to serve as a brake for 192/129 R, 129 A, [30, 131, I44; 3l the instanteous stopping of the rotation of the blade. 2 In another form of the invention a rubber wedge is driven into the cutting edge of the blade so as to in- [561 References C'ted stantaneously stop the rotation of the blade. In both NITED TA ES P T N forms of the invention the sensitivity of the sensor may 1,189.602 7/1916 Michener 30/390 be adjusted to Suit the Capacitance effect of the indil,55l,9()0 9/1925 Morrow .v 144/25] R vidual user of the equipment. 2,798,583 7/l957 Jeszka et al [92/130 3.409.842 11/1968 Embling ct =11 t. 317/010. 2 5 Clams 9 Drawmg Figures A? W c ME-4 -1 4/ r' m w L? 20 ANTENNA MPL F/ E BE LL A E I D/JC/Q/M/A A me 1451 Jan. 15, 1974 Primary Examiner-Donald R. Schran rift AUTOMATIC SAFETY BRAKE FOR ROTARY BLADE EQUIPMENT BACKGROUND OF THE INVENTION Field of the Invention Summary of the Invention The brake of the present invention is instanteously actuated by the capacitance effect of a human body approaching the blade in such a way that cutting of the body would otherwise take place. Adjustability of the equipment permits theequipment'to be tuned to the capacitance effect of each individual user.

The primary object of the invention is to provide an automatic brake for the rotary blade of rotary blade equipment actuated by approach of the human body to the blade.

.Other objects and advantages will become apparent in the following specification when considered in the light of the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a perspective view of the invention;

FIG. 2 is an enlarged fragmentary vertical sectional view, taken along the line 2-2 of FIG. 1, looking in the direction of the arrows;

FIG. 3 is a transverse vertical cross section, taken along the line 3-3 of FIG. 2, looking in the direction of the arrows;

FIG. 4 is a transverse horizontal sectional view, taken along the line 4-4 of FIG. 2, looking in the direction of the arrows;

FIG. 5 is a vertical sectional view, taken along the line of 55 of FIG. 2, looking in the direction of the arrows;

FIG. 6 is a semi-diagrammatic view of the electric circuity involved in the invention;

FIG. 7 is a transverse sectional view of a table saw incorporating the invention;

FIG. 8 is a vertical sectional view, taken along the line 8-8 of FIG. 7, looking in the direction of the arrows; and

FIG. 9 is a horizontal sectional view, taken along the line 9--9 of FIG. 7, looking in the direction of the arrows.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings in detail, wherein like reference characters indicate like parts throughout the several figures, the reference numeral 10 indicates generally an automatic safety brake for rotary saws constructed in accordance with the invention.

The brake 10 is illustrated in FIG. 1 attached to an electric hand saw 11 of the type having a blade guide 12 secured thereto and covering the upper portion of the blade 13 mounted onthe shaft 14. The blade l3 is electrically insulated from the shaft 14 by insulating washers W.

An amplifier 15 is connected to an antenna 16 positioned close to the blade 13 so that the blade 13 becomes a part of the electronic circuit. The amplifier is electrically connected to a discriminator 16 pulling an indicator l7 thereon and is in turn electrically connected to an electronic relay 18 having an adjustment knob 19 forming a part thereof. The amplifier 15, discriminator l6 and electronic relay 18 with its adjustment knob 19 together serve as a capacitance proximity sensor for actuating a bell 20 and a brake solenoid 21.

A pair of U-shaped brackets 22 are secured by bolts 23 internally of the blade guide 12 with each having a cam brake member 24 mounted for rotary motion therein on a shaft 25. The shafts 25 are provided respectively with crank arms 26, 27 having a slotted connection to a pivot pin 28. The pivot pin 28 connects the crank arms 26, 27 to the lower end of an armature 29 of a solenoid 21. The solenoid 21 is mounted in a housing 30 connected to the blade guide 12.

In the use an operation of the invention the operator sets the knob 19 to a position such that as his finger first approaches the blade 13 the bell 20 will ring as the indicator 17 reaches the Z and at the brake actuating solenoid will be energized as the indicator reaches X. The threading of the knob 19 should be such that the solenoid 21 will operate just prior to the finger touching the blade 13 so that the cam brake members 24 will be rotated by their shafts 25 when rotated by movement of the armature 29 in the solenoid 21. The movement of the brakes 24 into engagement with the blade 13 is virtually instantaneous and the blade 13 stops prior to even the slightest contact with the body of the user regardless of the speed of movement of the users finger toward a contacting position with respect to the blade 13.

In FIGS. 7 through 10 a modified form of the invention is illustrated wherein an electronic brake for a rotary blade is indicated generally at 110. The brake is used with a table saw indicated generally at 111 having a frame 112 carrying a saw blade 113 mounted on a shaft 114 supported on the frame 112. The blade 113 is driven from an electric motor 115 by a belt 116 controlled by a belt tightener pulley 117. A control shaft 118 normally urges the belt tightener pulley 117 into belt tightening position by means of a connecting link 118 and spring 119. A link 120 is connected to the spring 119 and is carried by a slide shaft 12] mounted in bearings 122 depending from the frame 112. An arm 123 extends upwardly through the frame 112 and is connected to a block 124 slidably mounted on the frame 112 in aligned relation to the saw blade 113. A rubber wedge block 125 is connected to the slide block 124 and arranged for engaging with the saw blade 113 when moved toward the saw 113. A solenoid 126 is mounted on the frame 112 and is connected by an armature 127 to the block 124 so that actuation of the solenoid 126 forces the block 124 toward the blade 113 and engages the rubber brake block 125 with the teeth of the saw 113. Simultaneously the shaft 121 is moved in the direction to compass the spring 119 and pull the belt tightener 117 out of contact with the belt 116 to release the driving connection between the motor 115 and the shaft 114. The solenoid 126 is actuated by an identical amplifier, discriminator, and electronic relay as that used with the preferred form of the invention as illustrated in FIG. 6.

The use and operation of the apparatus illustrated in FIGS. 7, 8 and 9 is identical to that of the preferred form of the invention illustrated in FIGS. 1 through 6. It should be understood that the rubber block 125 is of sufficient strength to prevent the teeth of the blade 113 from cutting therethrough as the blade 113 is brought to a stop.

Having thus described the preferred embodiments of the invention it should be understood that numerous structural modifications and adaptations may be resorted to without departing from the spirit of the invention.

What is claimed is:

1. A power tool comprising a frame, a rotating cutting blade mounted in said frame, a brake mounted in said frame for movement into blade contacting position, a solenoid mounted in said frame and connected to said brake for moving said brake into contact with said blade, a capacitance proximity sensor mounted on said frame for detecting the approach of a portion of a human body to said blade, and means actuated by said sensor for energizing said solenoid to instanteously stop said blade when a portion of the human body closely approaches said blade.

2. A device as claimed in claim 1 including means for adjusting the relative senitivity of said sensor to tune said sensor to the capacitances of the body of the user.

3. A device as claimed in claim 1 wherein an audible signal is actuated by the means for actuating said solenoid prior to the actuation of said solenoid.

4. A device as claimed in claim 1 wherein said brake is mounted for rotation and includes a cam surface for binding engagment with the side face of said saw blade.

5. A device as claimed in claim 1 wherein said brake is mounted for sliding movement with respect to said blade and engages the cutting edge of said blade.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1189603 *Apr 21, 1915Jul 4, 1916Charles E MichenerSaw.
US1551900 *Dec 5, 1924Sep 1, 1925Robert L MorrowSafety device
US2798583 *Sep 18, 1953Jul 9, 1957Smith Corp A OElectric eye barrier guard
US3409842 *Jun 30, 1967Nov 5, 1968Electronic Machine Control SalProtection systems and apparatus
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4026177 *Jul 21, 1976May 31, 1977Lokey Tool, Inc.Rotary insulated saw blade
US4075961 *May 7, 1976Feb 28, 1978Burlington Industries, Inc.Injury protection device for machinery
US4117752 *Apr 15, 1977Oct 3, 1978Kichi YonedaEmergency system for stopping a band blade of a cutting apparatus
US4512224 *Mar 31, 1983Apr 23, 1985Kabushiki Kaisha KindaiSlitter device
US4683381 *Oct 4, 1984Jul 28, 1987Ets. BonnetControlled-access apparatus for the agricultural food industries
US4753012 *May 4, 1987Jun 28, 1988Andreas StihlChain saw having a braking arrangement
US4804945 *Oct 29, 1987Feb 14, 1989Terrance MilletDoor alarm with infrared and capacitive sensors
US4965909 *May 19, 1989Oct 30, 1990Mccullough Timothy JSafety control for power operated equipment
US5038473 *Feb 28, 1990Aug 13, 1991The United States Of America As Represented By The Administrator Of The National Aeronautics And Space AdministrationPower saw
US5198702 *Feb 19, 1991Mar 30, 1993Mccullough Timothy JControl and safety system for electrically operated devices
US5272946 *Mar 20, 1992Dec 28, 1993Food Industry Equipment International, Inc.Safety control system for power operated equipment
US5510685 *Jul 22, 1994Apr 23, 1996Grasselli; GiorgioElectric motor control based on conductive contact of machine component with operator for injury prevention
US5666010 *Aug 30, 1995Sep 9, 1997Stratiotis; GusSafety system for machine tools
US6813983Jan 16, 2002Nov 9, 2004Sd3, LlcPower saw with improved safety system
US6826988Jan 16, 2002Dec 7, 2004Sd3, LlcMiter saw with improved safety system
US6880440Jan 16, 2002Apr 19, 2005Sd3, LlcMiter saw with improved safety system
US6900728 *Jul 29, 2002May 31, 2005Home Depot U.S.A., Inc.System to detect user entry into a defined danger zone
US6945148Jan 14, 2002Sep 20, 2005Sd3, LlcMiter saw with improved safety system
US6957601 *Sep 17, 2001Oct 25, 2005Sd3, LlcTranslation stop for use in power equipment
US6959631Nov 12, 2003Nov 1, 2005Makita CorporationPower tools
US6994004Jan 16, 2002Feb 7, 2006Sd3, LlcTable saw with improved safety system
US7000514Jul 25, 2002Feb 21, 2006Sd3, LlcSafety systems for band saws
US7047854Sep 7, 2005May 23, 2006Makita CorporationPower tools
US7077039Nov 12, 2002Jul 18, 2006Sd3, LlcDetection system for power equipment
US7084779Sep 10, 2004Aug 1, 2006Makita CorporationPower tool
US7197969 *Sep 13, 2002Apr 3, 2007Sd3, LlcLogic control with test mode for fast-acting safety system
US7228772 *Feb 18, 2005Jun 12, 2007Sd3, LlcBrake positioning system
US7231856Jun 13, 2002Jun 19, 2007Sd3, LlcApparatus and method for detecting dangerous conditions in power equipment
US7359174 *Aug 18, 2006Apr 15, 2008Sd3, LlcMotion detecting system for use in a safety system for power equipment
US7373863Jan 8, 2004May 20, 2008Black & Decker Inc.Power tool safety mechanisms
US7377199Jan 16, 2002May 27, 2008Sd3, LlcContact detection system for power equipment
US7617752May 23, 2008Nov 17, 2009Sd3, LlcContact detection system for power equipment
US7622831Jul 12, 2007Nov 24, 2009Aurora Office Equipment Co., Ltd. ShanghaiTouch-sensitive paper shredder control system
US7640835 *Oct 22, 2007Jan 5, 2010Sd3, LlcApparatus and method for detecting dangerous conditions in power equipment
US7640837 *Mar 27, 2008Jan 5, 2010Sd3, LlcTable saw with improved safety system
US7644645Nov 17, 2008Jan 12, 2010Sd3, LlcApparatus and method for detecting dangerous conditions in power equipment
US7661343 *Apr 17, 2007Feb 16, 2010Sd3, LlcBrake mechanism for power equipment
US7661614Jul 11, 2005Feb 16, 2010Fellowes Inc.Shredder throat safety system
US7685912 *Nov 5, 2007Mar 30, 2010Sd3, LlcMiter saw with improved safety system
US7698975 *Nov 24, 2003Apr 20, 2010Techtronic Power Tools Technology LimitedTable saw with cutting tool retraction system
US7698976 *Jul 29, 2008Apr 20, 2010Sd3, LlcMiter saw with improved safety system
US7712403 *Jul 2, 2002May 11, 2010Sd3, LlcActuators for use in fast-acting safety systems
US7788999 *Apr 10, 2006Sep 7, 2010Sd3, LlcBrake mechanism for power equipment
US7789002Nov 17, 2008Sep 7, 2010Sd3, LlcTable saw with improved safety system
US7827889 *Sep 14, 2007Nov 9, 2010Black & Decker, Inc.Power tool safety mechanisms
US7841266 *Jan 22, 2007Nov 30, 2010Robert Bosch GmbhProximity sensor for stationary power tools
US7848799Aug 17, 2005Dec 7, 2010Path Scientific, LlcDrill device and method for forming microconduits
US7900541Aug 29, 2008Mar 8, 2011Sd3, LlcDetection system for power equipment
US7908950 *Jan 4, 2010Mar 22, 2011Sd3Table saw with improved safety system
US7946514Oct 13, 2009May 24, 2011Fellowes, Inc.Shredder with thickness detector
US7946515Dec 3, 2009May 24, 2011Fellowes, Inc.Shredder throat safety system
US7954737Oct 4, 2007Jun 7, 2011Fellowes, Inc.Shredder thickness with anti-jitter feature
US7958806Nov 2, 2009Jun 14, 2011Sd3, LlcReplaceable brake mechanism for power equipment
US7963468Nov 11, 2009Jun 21, 2011Fellowes, Inc.Shredder with thickness detector
US8006595Jan 4, 2010Aug 30, 2011Sd3, LlcApparatus and method for detecting dangerous conditions in power equipment
US8008812Jul 22, 2010Aug 30, 2011Aurora Office Equipment Co., Ltd.Paper shredder control system responsive to touch-sensitive element
US8011279 *Dec 17, 2007Sep 6, 2011Sd3, LlcPower equipment with systems to mitigate or prevent injury
US8018099Oct 9, 2009Sep 13, 2011Aurora Office Equipment Co., Ltd.Touch-sensitive paper shredder control system
US8020796Jun 16, 2010Sep 20, 2011Fellowes, Inc.Shredder thickness with anti-jitter feature
US8051758Feb 13, 2008Nov 8, 2011Robert Bosch GmbhInjury mitigation system for power tools
US8051759Mar 22, 2010Nov 8, 2011Sd3, LlcMotion detecting system for use in a safety system for power equipment
US8061246Mar 26, 2010Nov 22, 2011Sd3, LlcMiter saw with improved safety system
US8079292Apr 30, 2007Dec 20, 2011Sd3, LlcDetection system for power equipment
US8082825 *Jun 9, 2009Dec 27, 2011Butler David JHealth and safety system for a table saw
US8087599Jul 27, 2009Jan 3, 2012Aurora Office Equipment Co., Ltd.Anti-paper jam protection device for shredders
US8091809Mar 24, 2009Jan 10, 2012Fellowes, Inc.Shredder with jam proof system
US8113451Jun 16, 2010Feb 14, 2012Fellowes, Inc.Shredder thickness with anti-jitter feature
US8146845Jul 27, 2009Apr 3, 2012Aurora Office Equipment Co., Ltd. ShanghaiAutomatic shredder without choosing the number of paper to be shredded
US8162244Jul 30, 2008Apr 24, 2012Acco Uk LimitedShredding machine
US8186256Sep 24, 2010May 29, 2012Black & Decker Inc.Power tool safety mechanisms
US8191450 *Aug 20, 2010Jun 5, 2012Sd3, LlcPower equipment with detection and reaction systems
US8201761Jan 5, 2009Jun 19, 2012Fellowes, Inc.Thickness sensor based motor controller
US8201766Jul 27, 2009Jun 19, 2012Aurora Office Equipment Co., Ltd.Pins or staples removable structure of automatic shredders
US8205815May 15, 2009Jun 26, 2012Fellowes, Inc.Paper alignment sensor arrangement
US8241229Oct 29, 2010Aug 14, 2012Path Scientific, LlcDrill device and method for forming microconduits
US8291797Aug 27, 2010Oct 23, 2012Sd3, LlcTable saw with improved safety system
US8316547 *Oct 16, 2007Nov 27, 2012Robert Bosch GmbhProtection device for a hand-held power tool
US8322259Mar 9, 2012Dec 4, 2012Jeff BuchananSafety system and method for cuttinig machine
US8336432 *Sep 24, 2011Dec 25, 2012David J ButlerSafety system for machine tools
US8371196Nov 7, 2011Feb 12, 2013Sd3, LlcMotion detecting system for use in a safety system for power equipment
US8382019May 3, 2010Feb 26, 2013Fellowes, Inc.In-rush current jam proof sensor control
US8402869Aug 27, 2010Mar 26, 2013Sd3, LlcBrake mechanism for power equipment
US8408106 *Apr 9, 2012Apr 2, 2013Sd3, LlcMethod of operating power equipment with detection and reaction systems
US8408107Apr 6, 2012Apr 2, 2013Black & Decker Inc.Power tool safety mechanisms
US8413559Aug 29, 2011Apr 9, 2013Sd3, LlcApparatus and method for detecting dangerous conditions in power equipment
US8424787Jul 19, 2011Apr 23, 2013Fellowes, Inc.Shredder thickness with anti-jitter feature
US8430005Nov 21, 2011Apr 30, 2013Sd3, LlcMiter saw with improved safety system
US8430347Oct 15, 2009Apr 30, 2013Fellowes, Inc.Thickness adjusted motor controller
US8438958Dec 19, 2011May 14, 2013Sd3, LlcDetection system for power equipment
US8464767Jan 27, 2012Jun 18, 2013Fellowes, Inc.Shredder thickness with anti-jitter feature
US8490527Sep 1, 2011Jul 23, 2013Sd3, LlcPower equipment with systems to mitigate or prevent injury
US8500049Jul 19, 2011Aug 6, 2013Fellowes, Inc.Shredder thickness with anti-jitter feature
US8511593May 28, 2010Aug 20, 2013Fellowes, Inc.Differential jam proof sensor for a shredder
US8522655 *Apr 9, 2012Sep 3, 2013Sd3, LlcLogic control for fast-acting safety system
US8528452Jul 27, 2011Sep 10, 2013Jeff BuchananSafety system and method for cutting machine
US8549966Oct 21, 2008Oct 8, 2013Formax, Inc.Output conveyor for a food article slicing machine
US8550387Jun 17, 2010Oct 8, 2013Tai Hoon K. MatlinRestrictive throat mechanism for paper shredders
US8616103 *Oct 21, 2008Dec 31, 2013Formax, IncKnife blade retraction mechanism for a food article slicing machine
US8636748Oct 29, 2010Jan 28, 2014Path Scientific, LlcDrill device and method for forming microconduits
US8670844 *Nov 11, 2008Mar 11, 2014Robert Bosch GmbhDevice, particularly protective sensor system, for a machine tool
US8672247Aug 19, 2011Mar 18, 2014Fellowes, Inc.Shredder with thickness detector
US8678305Jun 18, 2009Mar 25, 2014Fellowes, Inc.Restrictive throat mechanism for paper shredders
US8708260Aug 8, 2011Apr 29, 2014Aurora Office Equipment Co., Ltd.Depowered standby paper shredder and method
US8723468Apr 28, 2011May 13, 2014Aurora Office Equipment Co., Ltd.Cooled motor
US8752301 *Apr 8, 2009Jun 17, 2014Rex GeorgeChainsaw incorporating a safety device system
US8757526Aug 19, 2011Jun 24, 2014Fellowes, Inc.Shredder with thickness detector
US8783592Mar 26, 2010Jul 22, 2014Fellowes, Inc.Shredder with thickness detector
US8850938Oct 21, 2008Oct 7, 2014Formax, Inc.Maintenance and safety system for a food article slicing machine
US8870106Feb 3, 2011Oct 28, 2014Fellowes, Inc.Shredder with thickness detector
US8950305 *Aug 9, 2011Feb 10, 2015Innovative Engineering Solutions, Inc.Saw brake
US8963379Jun 27, 2011Feb 24, 2015Aurora Office Equipment Co., Ltd. ShanghaiPaper shredder control system responsive to touch-sensitive element
US8978529Oct 21, 2008Mar 17, 2015Formax, Inc.Food article feed apparatus for a food article slicing machine
US20100050836 *Aug 27, 2009Mar 4, 2010Juergen SeidelMachine tool protective device
US20100180740 *May 13, 2008Jul 22, 2010Reiner KrapfMachine tool having a safety unit and a calibration unit for calibrating the safety unit
US20100257743 *Apr 8, 2009Oct 14, 2010Rex GeorgeSystems and Methods for a Chainsaw Safety Device
US20110022188 *Nov 11, 2008Jan 27, 2011Reiner KrapfDevice, particularly protective sensor system, for a machine tool
US20110308365 *Sep 2, 2011Dec 22, 2011Yuan Ze UniversitySafety device for machine tool
US20120090439 *Dec 26, 2011Apr 19, 2012Butler David JHealth and safety system for a table saw
US20120260781 *Apr 9, 2012Oct 18, 2012Gass Stephen FLogic control for fast-acting safety system
US20120260782 *Apr 9, 2012Oct 18, 2012Gass Stephen FPower equipment with detection and reaction systems
US20140165801 *Aug 29, 2013Jun 19, 2014Sd3, LlcLogic control for fast-acting safety system
USRE44161Feb 18, 2011Apr 23, 2013Fellowes, Inc.Shredder with thickness detector
CN100389939CNov 12, 2003May 28, 2008株式会社牧田Power tools
EP0138702A1 *Oct 8, 1984Apr 24, 1985Bonnet S.A.Apparatus for the food industry with access controlled by a device creating a variation in electrical impedance
EP1234285A2 *Sep 29, 2000Aug 28, 2002SD3, LlcSafety systems for power equipment
EP1234285A4 *Sep 29, 2000Feb 23, 2011Sd3 LlcSafety systems for power equipment
EP1422022A1 *Nov 11, 2003May 26, 2004Makita CorporationPower tools
WO2001026064A2 *Sep 29, 2000Apr 12, 2001Sd3 LlcSafety systems for power equipment
WO2001026064A3 *Sep 29, 2000Sep 4, 2003Sd3 LlcSafety systems for power equipment
WO2003006213A2 *Jul 11, 2002Jan 23, 2003Black & Decker IncPower tool safety mechanisms
Classifications
U.S. Classification30/388, 192/130, 192/144, 192/129.00A, 30/390, 83/58
International ClassificationB27B5/00, F16P3/00, F16P3/14, B23Q11/08, B27B5/38, B23Q11/00
Cooperative ClassificationB23Q11/08, B27B5/38, F16P3/14, B23Q11/0092
European ClassificationB23Q11/00G8, B23Q11/08, B27B5/38, F16P3/14