US1551900A - Safety device - Google Patents

Safety device Download PDF

Info

Publication number
US1551900A
US1551900A US754050A US75405024A US1551900A US 1551900 A US1551900 A US 1551900A US 754050 A US754050 A US 754050A US 75405024 A US75405024 A US 75405024A US 1551900 A US1551900 A US 1551900A
Authority
US
United States
Prior art keywords
saw
high frequency
high
means
potential
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
US754050A
Inventor
Robert L Morrow
Original Assignee
Robert L Morrow
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 Robert L Morrow filed Critical Robert L Morrow
Priority to US754050A priority Critical patent/US1551900A/en
Application granted granted Critical
Publication of US1551900A publication Critical patent/US1551900A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0078Safety devices protecting the operator, e.g. against accident or noise
    • B23Q11/0082Safety devices protecting the operator, e.g. against accident or noise by determining whether the operator is in a dangerous position
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16PSAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00Safety 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
    • F16P3/12Safety 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
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S83/00Cutting
    • Y10S83/01Safety devices
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/768Rotatable disc tool pair or tool and carrier
    • Y10T83/7684With means to support work relative to tool[s]
    • Y10T83/773Work-support includes passageway for tool [e.g., slotted table]
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/768Rotatable disc tool pair or tool and carrier
    • Y10T83/7734With guard for tool
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/95Machine frame
    • Y10T83/96Guard

Description

Sept. 1; 1925. 1,551,900

R. L. MORROW SAFETY DEVICE Filed Dec'. 5. 1924 INVENTOR or sleeve 9 is of conducting material, and

the accumulated charge. As soon as the circuit is broken, the core of the coil 11 be comes demagnetized, and the armature 12 closes the primary circuit again. This opening and closing of the circuit takes place repeatedly in rapid succession, producing an oscillating current in the primary coil 13, which is transformed in the secondary winding 16 into a very-high voltage oscillating current, the voltage depending on the number of turns of wire in the secondary l6 in relationto the number of turns in the'primary 13 and the voltageapplied to the primary. The secondary 16 would normally have thousands of turns. The terminal 17 of the secondary is connected, as directly as possible, to a conductor disposed adjacent the danger point, or preferably to the source of danger itself,- as illustrated, the saw. Terminal 19 is suitably grounded. i

The potential is suflicient so that a spark will jump from the saw or other charged part of the mechanism a distance of about 2 inches, in practice, more or-less, asthe potential is varied, so that'when the hand or other part of the body of the worker approaches the saw to within a couple of inches thereof, the saw immediately gives out a spark and causes a shock and burn causing him instantly and involuntarily to withdraw his'han-d away from the saw.

The high frequency, high potential used is substantially that used by doctors in the treatment of various maladies, andwhen applied to the human body, the small amount of current which flows at the high frequency high potential has a beneficial effect rather than otherwise upon the body.

The potential being so: high, the conductor leading it to the danger point must be carefully insulated, and it is desirable that it be short. Asshown, I prefer to make the'shaft 3 and flanges 2 holding the saw 1 thereon of non-conducting material. The shaft 3 may be provided with a shoulder against which one flange 2 abuts and the other may be held on and thesaw'clamped by means'of a flanged threaded cap or sleeve 9, screw-threaded upon the end of the shaft, and between the shaft and the flanges .2 forming a seat for the latter. This cap is in contact with the saw 1, and may have formed thereon an exposed contactpoint 32 which projects outwardly and makes contact witha suitable fixed contact member 18 connected with the terminal 17 of the coil.

In order to provide a definite andeffec tive ground, thetable is'preferably covered by a metal plate 25, which extends to withinabout 2 inches of the saw,.and is connected with a metal plate 26 on the floor surrounding the tableon which the operator stands. Tl1e plates;25, '26 are connected electrically, as by Wire to the negative side 19 of the high frequency coil.

While I have described my invention as applied to a wood-cutting saw, it is to be fully understood that it is applicable to any form of dangerous tool where a high frequency high potential can be maintained at or near the danger point and insulated from the ground.

The operation of the device is as follows:

WVhen the saw or other tool is started up for use, the current is also caused to flow worker in any way. The operator stands upon plate 26 and in feeding thebwork to the sawhis hand generally touches plate 25, both 'of these being connected to the negative of the high frequency coil; thus the operator is grounded. If, and when, hisQhand or other part of his body approaches within a predetermined distance, say two inches, more or less, ofthe saw, due to the high frequency, high potential of the saw, a spark jumps from the saw to the hand or nearestv part ofthe body-of the worker, giving him a shock or burning sensation which causes his muscles to involuntarily contract, and causes him to withdraw from danger on receipt of'this warning and before he is hurt.

'Having. now described my invention, I claim and desire to secure by Letters Patent:

1. The method of guarding a dangerous tool which consists in insulating said tool from the ground, and applying a high frequency, high electrical potential thereto.

2. The combination comprising a tool, means for applying a high frequency, high electrical potential to said tool, and means for insulating said tool from the ground.

3. The combination comprising a cutting vor other: dangerous. tool, and means for maintaining a high frequency, high electrical potential adjacent the danger point,

4. The combination comprising a cutting or other dangerous tool, a source of electric current, means for increasing the frequency and stepping up said current to a high frequency, high electrical potential, a terminal insulated from the ground disposed adjacent'the danger point, and a connection be tween. said means and said terminal.

5. The combination comprising a circular sa a ta le and: frame o whi h sai saw is insulated and revolubly mounted, and means for applying a high frequency, high electrical potential to said saw.

6. The combination comprising a circular saw, a table and frame at least partly of insulating material on Which said saw is revolubly mounted, and means for providing a high frequency, high electrical potential adjacent the cutting edge of said saW.

7. The combination comprising a circular saw, a table and frame upon which said saw is mounted and insulated from the ground, means for applying a high frequency, high electrical potential to said saw, a conducting plate for the operator to be in contact with, and a ground connection from the said means for applying the high frequency, high electrical potential leading to said plate.

8. The combination comprising a circular saw, a table and frame upon which said saW is revolubly mounted and insulated from the ground, a conducting plate upon the surface of said table approaching to Within a few inches of said saw, and means grounded upon said plate for applying a high frequency, high electrical potential to said saw.

9. The combination comprising a circular saw, atable and frame upon which said saw is revolubly mounted and insulated from the ground, a conducting plate upon the surface of said table approaching to Within a feW inches of said saw, a further plate surrounding said table for the operator to stand upon, and means grounded upon said plates for applying a high frequency, high electrical potential to said saw.

In testimony whereof I have signed my name to this specification.

ROBERT L. MORROW.

US754050A 1924-12-05 1924-12-05 Safety device Expired - Lifetime US1551900A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US754050A US1551900A (en) 1924-12-05 1924-12-05 Safety device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US754050A US1551900A (en) 1924-12-05 1924-12-05 Safety device

Publications (1)

Publication Number Publication Date
US1551900A true US1551900A (en) 1925-09-01

Family

ID=25033280

Family Applications (1)

Application Number Title Priority Date Filing Date
US754050A Expired - Lifetime US1551900A (en) 1924-12-05 1924-12-05 Safety device

Country Status (1)

Country Link
US (1) US1551900A (en)

Cited By (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785230A (en) * 1972-11-08 1974-01-15 Lokey Tool Inc Automatic safety brake for rotary blade equipment
US20020017176A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Detection system for power equipment
US20020017175A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Translation stop for use in power equipment
US20020017336A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Apparatus and method for detecting dangerous conditions in power equipment
US20020020265A1 (en) * 2000-08-14 2002-02-21 Gass Stephen F. Translation stop for use in power equipment
US20020059854A1 (en) * 2000-09-29 2002-05-23 Gass Stephen F. Miter saw with improved safety system
US20020069734A1 (en) * 2000-09-29 2002-06-13 Gass Stephen F. Contact detection system for power equipment
US20020190581A1 (en) * 2001-06-13 2002-12-19 Gass Stephen F. Apparatus and method for detecting dangerous conditions in power equipment
US20030002942A1 (en) * 2001-07-02 2003-01-02 Gass Stephen F. Discrete proximity detection system
US20030020336A1 (en) * 2001-07-25 2003-01-30 Gass Stephen F. Actuators for use in fast-acting safety systems
US20030058121A1 (en) * 2001-09-24 2003-03-27 Gass Stephen F. Logic control with test mode for fast-acting safety system
US20030056853A1 (en) * 2001-09-21 2003-03-27 Gass Stephen F. Router with improved safety system
US20030090224A1 (en) * 2001-11-13 2003-05-15 Gass Stephen F. Detection system for power equipment
US20030115804A1 (en) * 2000-03-15 2003-06-26 Goran Sundolm Fire door and a fire protection system
US20030131703A1 (en) * 2002-01-16 2003-07-17 Gass Stephen F. Apparatus and method for detecting dangerous conditions in power equipment
US20030140749A1 (en) * 2002-01-25 2003-07-31 Gass Stephen F. Brake Pawls for power equipment
US20040040426A1 (en) * 2002-08-27 2004-03-04 Gass Stephen F. Miter saw with improved safety system
US20040163514A1 (en) * 2001-08-13 2004-08-26 Gass Stephen F. Safety systems for power equipment
US6813983B2 (en) 2000-09-29 2004-11-09 Sd3, Llc Power saw with improved safety system
US6857345B2 (en) 2000-08-14 2005-02-22 Sd3, Llc Brake positioning system
US20050039586A1 (en) * 2003-08-20 2005-02-24 Gass Stephen F. Brake cartridges for power equipment
US20050041359A1 (en) * 2003-08-20 2005-02-24 Gass Stephen F. Motion detecting system for use in a safety system for power equipment
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
US20050139459A1 (en) * 2003-12-31 2005-06-30 Gass Stephen F. Switch box for power tools with safety systems
US20050139058A1 (en) * 2003-12-31 2005-06-30 Gass Stephen F. Brake cartridges and mounting systems for brake cartridges
US20050139057A1 (en) * 2003-12-31 2005-06-30 Gass Stephen F. Table saws with safety systems
US20050155473A1 (en) * 2003-12-31 2005-07-21 Gass Stephen F. Dectection systems for power equipment
US6920814B2 (en) 2000-08-14 2005-07-26 Sd3, Llc Cutting tool safety system
US20050178259A1 (en) * 2001-08-13 2005-08-18 Gass Stephen F. Miter saw with improved safety system
US6945148B2 (en) 2000-09-29 2005-09-20 Sd3, Llc Miter saw with improved safety system
US20050204885A1 (en) * 2002-01-14 2005-09-22 Gass Stephen F Miter saw with improved safety system
US20050252187A1 (en) * 2000-09-29 2005-11-17 Gass Stephen F Cutting tool safety system
US20060000337A1 (en) * 1999-10-01 2006-01-05 Gass Stephen F Band saw with safety system
US6994004B2 (en) 2000-09-29 2006-02-07 Sd3, Llc Table saw with improved safety system
US20060032352A1 (en) * 2000-09-18 2006-02-16 Gass Stephen F Translation stop for use in 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
US7100483B2 (en) 2000-08-14 2006-09-05 Sd3, Llc Firing subsystem for use in a fast-acting safety system
US20060247795A1 (en) * 2005-04-15 2006-11-02 Gass Stephen F Detection systems for power equipment
US7225712B2 (en) 2000-08-14 2007-06-05 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US7308843B2 (en) 2000-08-14 2007-12-18 Sd3, Llc Spring-biased brake mechanism for power equipment
US20080041204A1 (en) * 2000-08-14 2008-02-21 Gass Stephen F Apparatus and method for detecting dangerous conditions in power equipment
US7347851B1 (en) 2004-03-09 2008-03-25 Leo B Kriksunov Needleless hypodermic jet injector apparatus and method
US7350444B2 (en) 2000-08-14 2008-04-01 Sd3, Llc Table saw with improved safety system
US7472634B2 (en) 2003-08-20 2009-01-06 Sd3, Llc Woodworking machines with overmolded arbors
US7600455B2 (en) 2000-08-14 2009-10-13 Sd3, Llc Logic control for fast-acting safety system
US7610836B2 (en) 2000-08-14 2009-11-03 Sd3, Llc Replaceable brake mechanism for power equipment
US7712403B2 (en) 2001-07-03 2010-05-11 Sd3, Llc Actuators for use in fast-acting safety systems
US7827890B2 (en) 2004-01-29 2010-11-09 Sd3, Llc Table saws with safety systems and systems to mount and index attachments
US7836804B2 (en) 2003-08-20 2010-11-23 Sd3, Llc Woodworking machines with overmolded arbors
US8082825B2 (en) 2009-06-09 2011-12-27 Butler David J Health and safety system for a table saw
US8100039B2 (en) 2000-08-14 2012-01-24 Sd3, Llc Miter saw with safety system
US9476170B2 (en) * 2015-01-22 2016-10-25 Mac & Mac Hydrodemolition Inc. Shielding system for hydrodemolition apparatus
US9724840B2 (en) 1999-10-01 2017-08-08 Sd3, Llc Safety systems for power equipment
US10065332B2 (en) * 2010-01-08 2018-09-04 Fecken-Kirfel Gmbh & Co. Kg Device for splitting foam bodies

Cited By (140)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785230A (en) * 1972-11-08 1974-01-15 Lokey Tool Inc Automatic safety brake for rotary blade equipment
US8408106B2 (en) 1999-10-01 2013-04-02 Sd3, Llc Method of operating power equipment with detection and reaction systems
US7895927B2 (en) 1999-10-01 2011-03-01 Sd3, Llc Power equipment with detection and reaction systems
US20110061768A1 (en) * 1999-10-01 2011-03-17 Gass Stephen F Brake mechanism for power equipment
US7788999B2 (en) 1999-10-01 2010-09-07 Sd3, Llc Brake mechanism for power equipment
US7347131B2 (en) 1999-10-01 2008-03-25 Sd3, Llc Miter saw with improved safety system
US7621205B2 (en) 1999-10-01 2009-11-24 Sd3, Llc Band saw with safety system
US9969014B2 (en) 1999-10-01 2018-05-15 Sawstop Holding Llc Power equipment with detection and reaction systems
US9925683B2 (en) 1999-10-01 2018-03-27 Sawstop Holding Llc Table saws
US9724840B2 (en) 1999-10-01 2017-08-08 Sd3, Llc Safety systems for power equipment
US9522476B2 (en) 1999-10-01 2016-12-20 Sd3, Llc Power equipment with detection and reaction systems
US20100213018A1 (en) * 1999-10-01 2010-08-26 Gass Stephen F Brake mechanism for power equipment
US20060000337A1 (en) * 1999-10-01 2006-01-05 Gass Stephen F Band saw with safety system
US8402869B2 (en) 1999-10-01 2013-03-26 Sd3, Llc Brake mechanism for power equipment
US7055417B1 (en) 1999-10-01 2006-06-06 Sd3, Llc Safety system for power equipment
US10335972B2 (en) 1999-10-01 2019-07-02 Sawstop Holding Llc Table Saws
US8196499B2 (en) 1999-10-01 2012-06-12 Sd3, Llc Power equipment with detection and reaction systems
US20070186737A1 (en) * 1999-10-01 2007-08-16 Gass Stephen F Brake mechanism for power equipment
US7661343B2 (en) 1999-10-01 2010-02-16 Sd3, Llc Brake mechanism for power equipment
US7525055B2 (en) 1999-10-01 2009-04-28 Sd3, Llc Switch box for power tools with safety systems
US20030115804A1 (en) * 2000-03-15 2003-06-26 Goran Sundolm Fire door and a fire protection system
US8151675B2 (en) 2000-08-14 2012-04-10 Sd3, Llc Logic control for fast-acting safety system
US7640835B2 (en) 2000-08-14 2010-01-05 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7640837B2 (en) 2000-08-14 2010-01-05 Sd3, Llc Table saw with improved safety system
US7681479B2 (en) 2000-08-14 2010-03-23 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US20050139051A1 (en) * 2000-08-14 2005-06-30 Gass Stephen F. Brake positioning system
US8413559B2 (en) * 2000-08-14 2013-04-09 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US8191450B2 (en) 2000-08-14 2012-06-05 Sd3, Llc Power equipment with detection and reaction systems
US8438958B2 (en) 2000-08-14 2013-05-14 Sd3, Llc Detection system for power equipment
US8490527B2 (en) 2000-08-14 2013-07-23 Sd3, Llc Power equipment with systems to mitigate or prevent injury
US6920814B2 (en) 2000-08-14 2005-07-26 Sd3, Llc Cutting tool safety system
US20120067182A1 (en) * 2000-08-14 2012-03-22 Gass Stephen F Apparatus and method for detecting dangerous conditions in power equipment
US8100039B2 (en) 2000-08-14 2012-01-24 Sd3, Llc Miter saw with safety system
US7359174B2 (en) 2000-08-14 2008-04-15 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US8079292B2 (en) 2000-08-14 2011-12-20 Sd3, Llc Detection system for power equipment
US6957601B2 (en) * 2000-08-14 2005-10-25 Sd3, Llc Translation stop for use in power equipment
US20100180739A1 (en) * 2000-08-14 2010-07-22 Gass Stephen F Apparatus and method for detecting dangerous conditions in power equipment
US7350444B2 (en) 2000-08-14 2008-04-01 Sd3, Llc Table saw with improved safety system
US8522655B2 (en) 2000-08-14 2013-09-03 Sd3, Llc Logic control for fast-acting safety system
US9038515B2 (en) 2000-08-14 2015-05-26 Sd3, Llc Logic control for fast-acting safety system
US7137326B2 (en) 2000-08-14 2006-11-21 Sd3, Llc Translation stop for use in power equipment
US7600455B2 (en) 2000-08-14 2009-10-13 Sd3, Llc Logic control for fast-acting safety system
US20080041204A1 (en) * 2000-08-14 2008-02-21 Gass Stephen F Apparatus and method for detecting dangerous conditions in power equipment
US7024975B2 (en) 2000-08-14 2006-04-11 Sd3, Llc Brake mechanism for power equipment
US20070199622A1 (en) * 2000-08-14 2007-08-30 Gass Stephen F Detection system for power equipment
US8011279B2 (en) 2000-08-14 2011-09-06 Sd3, Llc Power equipment with systems to mitigate or prevent injury
US7308843B2 (en) 2000-08-14 2007-12-18 Sd3, Llc Spring-biased brake mechanism for power equipment
US8006595B2 (en) 2000-08-14 2011-08-30 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7100483B2 (en) 2000-08-14 2006-09-05 Sd3, Llc Firing subsystem for use in a fast-acting safety system
US7921754B2 (en) 2000-08-14 2011-04-12 Sd3, Llc Logic control for fast-acting safety system
US20020020265A1 (en) * 2000-08-14 2002-02-21 Gass Stephen F. Translation stop for use in power equipment
US20020017336A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Apparatus and method for detecting dangerous conditions in power equipment
US20020017175A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Translation stop for use in power equipment
US7210383B2 (en) 2000-08-14 2007-05-01 Sd3, Llc Detection system for power equipment
US7225712B2 (en) 2000-08-14 2007-06-05 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US7228772B2 (en) 2000-08-14 2007-06-12 Sd3, Llc Brake positioning system
US7832314B2 (en) 2000-08-14 2010-11-16 Sd3, Llc Brake positioning system
US20020017176A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Detection system for power equipment
US7284467B2 (en) 2000-08-14 2007-10-23 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US6857345B2 (en) 2000-08-14 2005-02-22 Sd3, Llc Brake positioning system
US7610836B2 (en) 2000-08-14 2009-11-03 Sd3, Llc Replaceable brake mechanism for power equipment
US20060032352A1 (en) * 2000-09-18 2006-02-16 Gass Stephen F Translation stop for use in power equipment
US8065943B2 (en) 2000-09-18 2011-11-29 Sd3, Llc Translation stop for use in power equipment
US8061245B2 (en) 2000-09-29 2011-11-22 Sd3, Llc Safety methods for use in power equipment
US7784507B2 (en) 2000-09-29 2010-08-31 Sd3, Llc Router with improved safety system
US6994004B2 (en) 2000-09-29 2006-02-07 Sd3, Llc Table saw with improved safety system
US20050274432A1 (en) * 2000-09-29 2005-12-15 Gass Stephen F Router with improved safety system
US20050252187A1 (en) * 2000-09-29 2005-11-17 Gass Stephen F Cutting tool safety system
US7357056B2 (en) 2000-09-29 2008-04-15 Sd3, Llc Cutting tool safety system
US6945148B2 (en) 2000-09-29 2005-09-20 Sd3, Llc Miter saw with improved safety system
US20060123964A1 (en) * 2000-09-29 2006-06-15 Gass Stephen F Table saw with improved safety system
US6880440B2 (en) 2000-09-29 2005-04-19 Sd3, Llc Miter saw with improved safety system
US20080295660A1 (en) * 2000-09-29 2008-12-04 Gass Stephen F Contact detection system for power equipment
US6877410B2 (en) 2000-09-29 2005-04-12 Sd3, Llc Miter saw with improved safety system
US7617752B2 (en) 2000-09-29 2009-11-17 Sd3, Llc Contact detection system for power equipment
US6826988B2 (en) 2000-09-29 2004-12-07 Sd3, Llc Miter saw with improved safety system
US6813983B2 (en) 2000-09-29 2004-11-09 Sd3, Llc Power saw with improved safety system
US20020069734A1 (en) * 2000-09-29 2002-06-13 Gass Stephen F. Contact detection system for power equipment
US20020059854A1 (en) * 2000-09-29 2002-05-23 Gass Stephen F. Miter saw with improved safety system
US8186255B2 (en) 2000-09-29 2012-05-29 Sd3, Llc Contact detection system for power equipment
US7377199B2 (en) 2000-09-29 2008-05-27 Sd3, Llc Contact detection system for power equipment
US9927796B2 (en) 2001-05-17 2018-03-27 Sawstop Holding Llc Band saw with improved safety system
US20020190581A1 (en) * 2001-06-13 2002-12-19 Gass Stephen F. Apparatus and method for detecting dangerous conditions in power equipment
US7231856B2 (en) 2001-06-13 2007-06-19 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7171879B2 (en) 2001-07-02 2007-02-06 Sd3, Llc Discrete proximity detection system
US20100083804A1 (en) * 2001-07-02 2010-04-08 Gass Stephen F Discrete proximity detection system
US7591210B2 (en) * 2001-07-02 2009-09-22 Sd3, Llc Discrete proximity detection system
US20030002942A1 (en) * 2001-07-02 2003-01-02 Gass Stephen F. Discrete proximity detection system
US7712403B2 (en) 2001-07-03 2010-05-11 Sd3, Llc Actuators for use in fast-acting safety systems
US20030020336A1 (en) * 2001-07-25 2003-01-30 Gass Stephen F. Actuators for use in fast-acting safety systems
US6945149B2 (en) 2001-07-25 2005-09-20 Sd3, Llc Actuators for use in fast-acting safety systems
US7000514B2 (en) 2001-07-27 2006-02-21 Sd3, Llc Safety systems for band saws
US7353737B2 (en) 2001-08-13 2008-04-08 Sd3, Llc Miter saw with improved safety system
US20040163514A1 (en) * 2001-08-13 2004-08-26 Gass Stephen F. Safety systems for power equipment
US6997090B2 (en) 2001-08-13 2006-02-14 Sd3, Llc Safety systems for power equipment
US20050178259A1 (en) * 2001-08-13 2005-08-18 Gass Stephen F. Miter saw with improved safety system
US20060123960A1 (en) * 2001-08-13 2006-06-15 Gass Stephen F Safety systems for power equipment
US20030056853A1 (en) * 2001-09-21 2003-03-27 Gass Stephen F. Router with improved safety system
US7197969B2 (en) 2001-09-24 2007-04-03 Sd3, Llc Logic control with test mode for fast-acting safety system
US20030058121A1 (en) * 2001-09-24 2003-03-27 Gass Stephen F. Logic control with test mode for fast-acting safety system
US7421315B2 (en) 2001-11-13 2008-09-02 Sd3, Llc Detection system for power equipment
US7900541B2 (en) 2001-11-13 2011-03-08 Sd3, Llc Detection system for power equipment
US20030090224A1 (en) * 2001-11-13 2003-05-15 Gass Stephen F. Detection system for power equipment
US7077039B2 (en) 2001-11-13 2006-07-18 Sd3, Llc Detection system for power equipment
US7290472B2 (en) 2002-01-14 2007-11-06 Sd3, Llc Miter saw with improved safety system
US20050204885A1 (en) * 2002-01-14 2005-09-22 Gass Stephen F Miter saw with improved safety system
US20030131703A1 (en) * 2002-01-16 2003-07-17 Gass Stephen F. Apparatus and method for detecting dangerous conditions in power equipment
US20100180741A1 (en) * 2002-01-16 2010-07-22 Gass Stephen F Apparatus and method for detecting dangerous conditions in power equipment
US7644645B2 (en) 2002-01-16 2010-01-12 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US20030140749A1 (en) * 2002-01-25 2003-07-31 Gass Stephen F. Brake Pawls for power equipment
US20040040426A1 (en) * 2002-08-27 2004-03-04 Gass Stephen F. Miter saw with improved safety system
US7350445B2 (en) 2003-08-20 2008-04-01 Sd3, Llc Brake cartridge for power equipment
US20090178524A1 (en) * 2003-08-20 2009-07-16 Gass Stephen F Woodworking machines with overmolded arbors
US7836804B2 (en) 2003-08-20 2010-11-23 Sd3, Llc Woodworking machines with overmolded arbors
US7472634B2 (en) 2003-08-20 2009-01-06 Sd3, Llc Woodworking machines with overmolded arbors
US20050039586A1 (en) * 2003-08-20 2005-02-24 Gass Stephen F. Brake cartridges for power equipment
US20050041359A1 (en) * 2003-08-20 2005-02-24 Gass Stephen F. Motion detecting system for use in a safety system for power equipment
US7827893B2 (en) 2003-12-31 2010-11-09 Sd3, Llc Elevation mechanism for table saws
US20050139459A1 (en) * 2003-12-31 2005-06-30 Gass Stephen F. Switch box for power tools with safety systems
US20050139057A1 (en) * 2003-12-31 2005-06-30 Gass Stephen F. Table saws with safety systems
US20050155473A1 (en) * 2003-12-31 2005-07-21 Gass Stephen F. Dectection systems for power equipment
US8122807B2 (en) 2003-12-31 2012-02-28 Sd3, Llc Table saws with safety systems
US8087438B2 (en) 2003-12-31 2012-01-03 Sd3, Llc Detection systems for power equipment
US8459157B2 (en) 2003-12-31 2013-06-11 Sd3, Llc Brake cartridges and mounting systems for brake cartridges
US7536238B2 (en) 2003-12-31 2009-05-19 Sd3, Llc Detection systems for power equipment
US9623498B2 (en) 2003-12-31 2017-04-18 Sd3, Llc Table saws
US8498732B2 (en) 2003-12-31 2013-07-30 Sd3, Llc Detection systems for power equipment
US7991503B2 (en) 2003-12-31 2011-08-02 Sd3, Llc Detection systems for power equipment
US20050139058A1 (en) * 2003-12-31 2005-06-30 Gass Stephen F. Brake cartridges and mounting systems for brake cartridges
US7866239B2 (en) 2003-12-31 2011-01-11 Sd3, Llc Elevation mechanism for table saws
US8489223B2 (en) 2003-12-31 2013-07-16 Sd3, Llc Detection systems for power equipment
US7707920B2 (en) 2003-12-31 2010-05-04 Sd3, Llc Table saws with safety systems
US8505424B2 (en) 2004-01-29 2013-08-13 Sd3, Llc Table saws with safety systems and systems to mount and index attachments
US7827890B2 (en) 2004-01-29 2010-11-09 Sd3, Llc Table saws with safety systems and systems to mount and index attachments
US10052786B2 (en) 2004-01-29 2018-08-21 Sawstop Holding Llc Table saws with safety systems and systems to mount and index attachments
US7347851B1 (en) 2004-03-09 2008-03-25 Leo B Kriksunov Needleless hypodermic jet injector apparatus and method
US20060247795A1 (en) * 2005-04-15 2006-11-02 Gass Stephen F Detection systems for power equipment
US8082825B2 (en) 2009-06-09 2011-12-27 Butler David J Health and safety system for a table saw
US10065332B2 (en) * 2010-01-08 2018-09-04 Fecken-Kirfel Gmbh & Co. Kg Device for splitting foam bodies
US9476170B2 (en) * 2015-01-22 2016-10-25 Mac & Mac Hydrodemolition Inc. Shielding system for hydrodemolition apparatus

Similar Documents

Publication Publication Date Title
US2427588A (en) Apparatus for burning holes in metal
US1340270A (en) Safety electric welding-torch
FR2413083A1 (en) Apparatus acupuncture
US2561122A (en) Livestock prod
ES498939A0 (en) Device for incorporating in the circuit power supply of an electrical apparatus
US2881554A (en) Fly swatter
GB1106957A (en) Instrument for crushing concretions in the urinary bladder
US2056951A (en) Electric soldering iron
GB1351008A (en) Power supply devices for electric apparatus
US1869448A (en) Electrical soldering apparatus
US2510337A (en) Calf weaner
US2327222A (en) Aiding device for blind persons
GB420587A (en) Improvements in and relating to the prevention of sparking in the control of electric circuits
CA1057822A (en) Spark plug tester ignition system
GB1075321A (en) Improvements in and relating to ignition devices for use with gas or oil burners
US3167809A (en) Electrical stunning device
GB697701A (en) Method and means for depositing varnishes upon surfaces
GB984176A (en) Improvements in or relating to electromagnetic devices
US2516264A (en) Insect electrocution trap
US3156863A (en) Apparatus for locating a fault in electric cables having semi-conducting coverings
US870927A (en) Electrotherapeutic instrument.
GB1076576A (en) Improvements in or relating to electrical inductors
US685766A (en) Magnetic fuse cut-out.
US2118137A (en) Testing apparatus
US2163069A (en) High voltage nonarcing selector switch