US3861016A - Electric safety control mechanism - Google Patents

Electric safety control mechanism Download PDF

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Publication number
US3861016A
US3861016A US417417A US41741773A US3861016A US 3861016 A US3861016 A US 3861016A US 417417 A US417417 A US 417417A US 41741773 A US41741773 A US 41741773A US 3861016 A US3861016 A US 3861016A
Authority
US
United States
Prior art keywords
guard
machine
switch
safety
head
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
US417417A
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English (en)
Inventor
Herbert Johnson
Frederick S Sillars
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.)
Newfrey LLC
USM Corp
Original Assignee
USM 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 USM Corp filed Critical USM Corp
Priority to US417417A priority Critical patent/US3861016A/en
Priority to CA209,621A priority patent/CA1011852A/en
Priority to FR7436696A priority patent/FR2251772B3/fr
Priority to NL7414385A priority patent/NL7414385A/xx
Priority to SE7414259A priority patent/SE7414259L/xx
Priority to IT29470/74A priority patent/IT1025728B/it
Priority to JP49132638A priority patent/JPS5083868A/ja
Priority to NO744132A priority patent/NO744132L/no
Priority to DE19742454783 priority patent/DE2454783A1/de
Application granted granted Critical
Publication of US3861016A publication Critical patent/US3861016A/en
Assigned to EMHART INDUSTRIES, INC. reassignment EMHART INDUSTRIES, INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: EMHART ENTERPRISES CORP., A NJ CORP.
Assigned to DYNAPERT INC., THE reassignment DYNAPERT INC., THE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EMHART INDUSTRIES, INC.
Assigned to EMHART INC. reassignment EMHART INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DYNAPERT INC., A CORP. OF DE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/02—Screens or other safety members moving in synchronism with members which move to and fro
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • 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
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53026—Means to assemble or disassemble with randomly actuated stopping or disabling means
    • Y10T29/53035—Responsive to operative [e.g., safety device, etc.]
    • 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
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/53174—Means to fasten electrical component to wiring board, base, or substrate
    • 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
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/872—With guard means

Definitions

  • a guard is movably mounted in a machine adjacent to shiftable operating mechanism potentially capable of injuring an attendant as by clamping his hand when it is inadvertently interposed between the operating mechanism and some other portion of the machine.
  • a safety circuit associated with the guard includes a switch means responsive to guard contact with an 0bstruction, and/or to manual displacement of the guard in any of several directions whereby the operating mechanism is at once deactivated and injury avoided.
  • One advantageous embodiment of the invention for instance, is in an automatic component inserting ma chine wherein the head and/or the work support is programmed for relative traverse.
  • the present invention resides in a novel combination, in an apparatus having elements with relative movement of approach, of a displaceable guard member and associated safety control circuitry connected to means driving the elements, the circuitry including a switch responsive to movement of the member in any one of several directions for immediately deenergizing the drive means and terminating motion of the elements.
  • the guard member is mounted as a fence about operating instrumentalities or about a single, otherwise exposed tool and has freedom to yield laterally, heightwise, fore and aft and pivotally about an axis.
  • a switch is responsively actuated to deenergize the drive of the apparatus.
  • the guard member may be at least partly transparent so that ones view of the operation is not impaired.
  • the member may be automatically returned to its neutral position as by spring means whereby machine operation is restored as soon as the interferring item is cleared from. the operating zone.
  • a second or additional fencelike guard of the type herein disclosed may be utilized and have operative connection with a common safety control circuit.
  • FIG. 1 is a perspective view of a portion of a machine provided with our electric safety control mechanism, the machine in this instance-being designed to install electronic components in printed wiring boards;
  • FIG. 2 is a view in front elevation of a portion of the control mechanism shown in FIG. 1 including a guard and an associated switch mechanism;
  • FIG. 3' is a plan view of the mechanism shown in FIG.
  • FIG. 4 is an enlarged plan view of the switch shown in FIGS. 2 and 3;
  • FIG. 5 is a view similar to that of FIG. 4 but with a switch actuating arm shown tilted by displacement of the guard;
  • FIG. 6 is an end view of the mechanism shown in FIG. 5;
  • FIG. 7 is a perspective view showing the guard and switch mounting
  • FIG. 8 is a diagram of a safety control circuit responsive to displacement of the guard.
  • an electronic component inserting apparatus 10 comprises an insertion head generally designated 12, work supporting means such as a pallet 14 movable in X-Y coordinates for carrying a printed circuit board (not shown) in its own horizontal plane, and lead clinching mechanism 16 operable beneath the printed circuit board for clinching the protruding ends of the leads which may have been cut, formed and then thrust endwise by the head 12 through preformed holes of the board held on the pallet by spaced clips 18,18 (only one shown).
  • the pallet 14 may be manually shifted horizontally as required or automatically programmed by means not herein shown; alternatively the head 12 may be programmed for X-Y movement relatively to the board, or both the pallet and the head may be respectively shifted in horizontal planes.
  • a motor driving means associated with the head and/or the pallet is schematically shown at M.
  • the head 12 comprises vertical guides 20,20 between which operating mechanism collectively and generally designated 22 (including perhaps such instrumentalities as cyclically operable lead cutters, guides, formers and driver bars) move reciprocably toward and from the board (and sometimes horizontally as well) to mount the successive components thereon in cooperation with the vertically reciprocable mechanism 16, the board intermittently being shifted horizontally with the pallet by appropriate drive means (not shown) to receive the component leads.
  • operating mechanism collectively and generally designated 22 including perhaps such instrumentalities as cyclically operable lead cutters, guides, formers and driver bars
  • the lead guides 23 for a so-called DIP Component are shown in FIG. 1.
  • the lead clinching mechanism 16 (FIG.
  • the safety mechanism 24 comprises a fence or guard 26 (FIGS. l-3 and 7) mounted on the head 12 as will be described and associated circuitry controlled by the guard as will later be explained.
  • the guard 26 is in this instance serving as a fence for the head 12 and hence extends in front of the head and about the zone of operation of the operating instrumentalities 22.
  • the shape of the guard 26 may appropriately be different, it is here rectangular and box-like, preferably having its front side provided with a transparent material 28 affording a window on the operating elements.
  • the guard 26 is pivotally supported for relative lateral movement on coaxial horizontal trunion pins 30 (FIGS. 2 and 7) and 32 (FIGS. 1 and 2) by means of upwardly extending angular arms 34,36 respectively projecting from rearward side extensions 35,35 (FIGS. 1, 3) of the guard 26.
  • the pin 32 is carried by the lower end of a bracket 38 fixedly secured to the right side of the head 12 as shown in FIGS. 1-3, and the pin 30 projects from the left side of the head to have its outboard end received in the lower end of a bracket 40 affixed to the head.
  • the guard 26 is yieldably urged against gravity into horizontal position by a spring plunger 42 (FIGS.
  • the guard 26 is movable with the head 12 in any direction and also relatively displaceable laterally of the head in opposite directions as well as heightwise and fore and aft thereof from a horizontal or neutral position.
  • this freedom of relative movement of the guard upon displacement is advantageously used to effect immediate deenergization of drive means M upon signal from a control or computer C (not herein shown except schematically) connected to the head 12, the mechanism 16, and/or the pallet 14 through a safety control circuit shown in FIG. 8, the drive means beingactuated and deactivated through operation of a switch assembly generally designated 50 (FIGS. 1-7) of the safety circuit and responsive to the positioning of the guard with respect to the head and its operating instrumentalities.
  • the switch assembly 50 is adjustably secured on the bracket 40 by screws 52,52 (FIGS. 4 and 5) extending through transverse slots 54,54 respectively formed in the switch.
  • the assembly 50 comprises a left hand normally closed, held open switch 56 having a contact 58, an actuating arm 60, and a roller 62 carried by an end of the arm 60, and a right hand normally open switch 64 similarly having a contact 66, an actuating arm 68 and a roller 70 carried by an end of the arm 58.
  • an L-shaped actuator 72 For operating the switches 56,64 (which are electrically connected in parallel as shown in FIG. 8) by means of displacement of the safety guard 26 from its normal neutral" position, an L-shaped actuator 72 (FIGS.
  • the safety circuit shown in FIG. 8 as corresponding to normal operating condition of the apparatus 10 thus is adapted to deenergize drive means M of the apparatus 10 when either one of the switches 56 or 64 is effectively closed by a relative displacement of the guard 26, or when a push button 80 (FIG. 8) is manually closed.
  • Deenergization of the drive M is at once effective, for example, through signal from the computer C.
  • the assembly' 50 as indicated in FIG. 4 accordingly has its switches 56 and 64 in positions of normal apparatus drive since neither of the rollers 62 or 70 has then been depressed by the actuator 72 to close either of the contacts 58 or 66.
  • the normally open switch 56 remains open while the switch 64 is closed. thereby again insuring immediate cessation of machine drive and avoidance of damage or injury.
  • a safety means comprising a guard mounted for movement with said one of the elements and displaceable in two or more directions relative to said one element, and a circuit for controlling actuation of the drive means, the circuit including a switch means responsive to displacement of the guard in any one of said directions for immediately deenergiz ing the power drive means.
  • guard is mounted for yielding displacement on said one element from a neutral or inoperative position on the guard, and spring means is adapted to urge return of the guard to said neutral position to restore operation of the machine.
  • guard is formed as a box-like fence adjacent to operating instrumentalities and is at least partly transparent to permit visual operation of the instrumentalities of the machine.
  • a machine as in claim 1 wherein the safety guard is mounted for pivotal movement about an axis, and is yieldable in either of opposite directions parallel to said axis.
  • switch means is mounted on said one element and includes a pair of independently operable, spaced switches, and switch actuating means associated with the guard and adapted to partake of its relative displacement is operable to actuate either of the switches to deenergize the machine drive means.
  • Safety mechanism for a machine having elements movable with relative approach to each other in a manner such that there is risk of an operator or article being caught or being endangered therebetween comprising a guard pivotally mounted on one of the movable elements for movement about a horizontal axis, means permitting the guard lateral yieldable movement in either of two directions along the axis from a neutral inoperative position, power means for driving said one or more of the elements, a safety control circuit connected to the power means and including switch means actuatable for deenergizing said power means, and mechanism responsive to deflection of the guard about said axis or along that axis for causing the switch means to deenergize said circuit and thereby render the power means inoperative.
  • Safety mechanism as in claim 6 wherein spring means is yieldingly operable to urge the deenergizing mechanism to resume an angular position wherein the control circuit remains energized.
  • Safety mechanism as in claim 8 wherein said switch actuator is an extension of the guard having a recessed portion for accommodating the actuating arm of one of the pair of switches when the machine is in normal operating condition.
  • an electronic component mounting machine comprising a frame, means movably mounted on the frame for supporting a wiring board which is to receive leads of the components in different predetermined positions, a component processing head movably mounted on one side of the board supporting means, lead clinching mechanism operable on the other side of the board supporting means, and power means for driving at least two of said head, clinching mechanism, and board supporting means with relative movement of approach toward one another, of a safety mechanism including a guard yieldingly associated with at least one of the head, clinching mechanism and board supporting means, and a control circuit responsive to displacement of the guard from an inoperative position to stop said relative movement of approach by deenergizing the power means, the control circuit including switch means actuatable by relative heightwise, lateral, or pivotal movement of the guard with respect to the head, clinching mechanism, or board supporting mechanism with which the guard is associated.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Supply And Installment Of Electrical Components (AREA)
US417417A 1973-11-19 1973-11-19 Electric safety control mechanism Expired - Lifetime US3861016A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US417417A US3861016A (en) 1973-11-19 1973-11-19 Electric safety control mechanism
CA209,621A CA1011852A (en) 1973-11-19 1974-09-19 Electric safety control mechanism
FR7436696A FR2251772B3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-11-19 1974-11-05
NL7414385A NL7414385A (nl) 1973-11-19 1974-11-05 Elektrisch werkende beveiligingsinrichting.
SE7414259A SE7414259L (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-11-19 1974-11-13
IT29470/74A IT1025728B (it) 1973-11-19 1974-11-15 Meccanismo di sicurezza per macchina a comando elettrico di arresto del funzionamento
JP49132638A JPS5083868A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-11-19 1974-11-18
NO744132A NO744132L (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-11-19 1974-11-18
DE19742454783 DE2454783A1 (de) 1973-11-19 1974-11-19 Sicherheitsvorrichtung fuer eine maschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US417417A US3861016A (en) 1973-11-19 1973-11-19 Electric safety control mechanism

Publications (1)

Publication Number Publication Date
US3861016A true US3861016A (en) 1975-01-21

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Application Number Title Priority Date Filing Date
US417417A Expired - Lifetime US3861016A (en) 1973-11-19 1973-11-19 Electric safety control mechanism

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US (1) US3861016A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS5083868A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA1011852A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2454783A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2251772B3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT1025728B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL7414385A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NO (1) NO744132L (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE7414259L (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

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FR2583137A1 (fr) * 1985-06-06 1986-12-12 Yoshida Kogyo Kk Dispositif de securite pour un couvercle pouvant etre ouvert et ferme automatiquement
EP0458098A3 (en) * 1990-05-21 1993-05-05 Erwin Jenkner Safety and cut-out device
EP0995941A3 (en) * 1998-09-25 2001-11-21 Matsushita Electric Industrial Co., Ltd. Component mounting machine and safety device thereof
US20040000491A1 (en) * 2002-06-28 2004-01-01 Applied Materials, Inc. Electroplating cell with copper acid correction module for substrate interconnect formation
US6745645B2 (en) 2002-02-27 2004-06-08 Smith International, Inc. Enhanced gage protection for milled tooth rock bits
US6813983B2 (en) 2000-09-29 2004-11-09 Sd3, Llc Power saw with improved safety system
US6827074B2 (en) 2002-05-24 2004-12-07 Datigen.Com, Inc. Method and apparatus for removing trip hazards in concrete sidewalks
US6826988B2 (en) 2000-09-29 2004-12-07 Sd3, Llc Miter saw with improved safety system
US6857345B2 (en) 2000-08-14 2005-02-22 Sd3, Llc Brake positioning system
US6877410B2 (en) 2000-09-29 2005-04-12 Sd3, Llc Miter saw with improved safety system
US6880440B2 (en) 2000-09-29 2005-04-19 Sd3, Llc Miter saw with improved safety system
US6920814B2 (en) 2000-08-14 2005-07-26 Sd3, Llc Cutting tool safety system
US6945149B2 (en) 2001-07-25 2005-09-20 Sd3, Llc Actuators for use in fast-acting safety systems
US6945148B2 (en) 2000-09-29 2005-09-20 Sd3, Llc Miter saw with improved safety system
US6957601B2 (en) * 2000-08-14 2005-10-25 Sd3, Llc Translation stop for use in power equipment
US6994004B2 (en) 2000-09-29 2006-02-07 Sd3, Llc Table saw with improved safety system
US6997090B2 (en) 2001-08-13 2006-02-14 Sd3, Llc Safety systems for power equipment
US7000514B2 (en) 2001-07-27 2006-02-21 Sd3, Llc Safety systems for band saws
US7024975B2 (en) 2000-08-14 2006-04-11 Sd3, Llc Brake mechanism for power equipment
US7055417B1 (en) 1999-10-01 2006-06-06 Sd3, Llc Safety system for power equipment
US7077039B2 (en) 2001-11-13 2006-07-18 Sd3, Llc Detection system for power equipment
US7100483B2 (en) 2000-08-14 2006-09-05 Sd3, Llc Firing subsystem for use in a fast-acting safety system
US20060230896A1 (en) * 1999-10-01 2006-10-19 Gass Stephen F Miter saw with improved safety system
US7137326B2 (en) 2000-08-14 2006-11-21 Sd3, Llc Translation stop for use in power equipment
US20060272463A1 (en) * 2000-08-14 2006-12-07 Gass Stephen F Motion detecting system for use in a safety system for power equipment
US7171879B2 (en) 2001-07-02 2007-02-06 Sd3, Llc Discrete proximity detection system
US7197969B2 (en) 2001-09-24 2007-04-03 Sd3, Llc Logic control with test mode for fast-acting safety system
US20070101842A1 (en) * 2003-08-20 2007-05-10 Gass Stephen F Woodworking machines with overmolded arbors
US7225712B2 (en) 2000-08-14 2007-06-05 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US20070175306A1 (en) * 2003-12-31 2007-08-02 Gass Stephen F Elevation mechanism for table saws
US7284467B2 (en) 2000-08-14 2007-10-23 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7290472B2 (en) 2002-01-14 2007-11-06 Sd3, Llc Miter saw with improved safety system
US7308843B2 (en) 2000-08-14 2007-12-18 Sd3, Llc Spring-biased brake mechanism for power equipment
US7347851B1 (en) 2004-03-09 2008-03-25 Leo B Kriksunov Needleless hypodermic jet injector apparatus and method
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US7350445B2 (en) 2003-08-20 2008-04-01 Sd3, Llc Brake cartridge for power equipment
US7353737B2 (en) 2001-08-13 2008-04-08 Sd3, Llc Miter saw with improved safety system
US7357056B2 (en) 2000-09-29 2008-04-15 Sd3, Llc Cutting tool safety system
US7377199B2 (en) 2000-09-29 2008-05-27 Sd3, Llc Contact detection system for power equipment
US7472634B2 (en) 2003-08-20 2009-01-06 Sd3, Llc Woodworking machines with overmolded arbors
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US8459157B2 (en) 2003-12-31 2013-06-11 Sd3, Llc Brake cartridges and mounting systems for brake cartridges
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US3690206A (en) * 1969-10-22 1972-09-12 Usm Corp Cutting press controls
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Cited By (110)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2583137A1 (fr) * 1985-06-06 1986-12-12 Yoshida Kogyo Kk Dispositif de securite pour un couvercle pouvant etre ouvert et ferme automatiquement
EP0458098A3 (en) * 1990-05-21 1993-05-05 Erwin Jenkner Safety and cut-out device
EP0995941A3 (en) * 1998-09-25 2001-11-21 Matsushita Electric Industrial Co., Ltd. Component mounting machine and safety device thereof
US6338192B1 (en) * 1998-09-25 2002-01-15 Matsushita Electric Industrial Co., Ltd. Component mounting machine and safety device thereof
US6490781B2 (en) 1998-09-25 2002-12-10 Matsushita Electric Industrial Co., Ltd. Component mounting machine and safety device thereof
US8196499B2 (en) 1999-10-01 2012-06-12 Sd3, Llc Power equipment with detection and reaction systems
US20100236663A1 (en) * 1999-10-01 2010-09-23 Gass Stephen F Power equipment with detection and reaction systems
US9925683B2 (en) 1999-10-01 2018-03-27 Sawstop Holding Llc Table saws
US9522476B2 (en) 1999-10-01 2016-12-20 Sd3, Llc Power equipment with detection and reaction systems
US8408106B2 (en) 1999-10-01 2013-04-02 Sd3, Llc Method of operating power equipment with detection and reaction systems
US20060180451A1 (en) * 1999-10-01 2006-08-17 Gass Stephen F Switch box for power tools with safety systems
US10335972B2 (en) 1999-10-01 2019-07-02 Sawstop Holding Llc Table Saws
US7895927B2 (en) 1999-10-01 2011-03-01 Sd3, Llc Power equipment with detection and reaction systems
US20110023673A1 (en) * 1999-10-01 2011-02-03 Gass Stephen F Power equipment with detection and reaction systems
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NO744132L (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1975-06-16
FR2251772B3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1977-08-05
FR2251772A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1975-06-13
IT1025728B (it) 1978-08-30
DE2454783A1 (de) 1975-05-22
NL7414385A (nl) 1975-05-21
JPS5083868A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1975-07-07
SE7414259L (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1975-05-20
CA1011852A (en) 1977-06-07

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