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US2785710A - Automatic brake for power tools - Google Patents

Automatic brake for power tools Download PDF

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Publication number
US2785710A
US2785710A US42722054A US2785710A US 2785710 A US2785710 A US 2785710A US 42722054 A US42722054 A US 42722054A US 2785710 A US2785710 A US 2785710A
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Prior art keywords
tool
motor
cutting
solenoid
means
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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
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Jr Jesse R Mowery
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DE WALT Inc
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DE WALT Inc
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    • 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
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/2245Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members in which the common actuating member acts on two levers carrying the braking members, e.g. tong-type brakes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27BSAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29Details; Component parts; Accessories
    • B27B5/38Devices for braking the circular saw blade or the saw spindle; Devices for damping vibrations of the circular saw blade, e.g. silencing
    • 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
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D59/00Self-acting brakes, e.g. coming into operation at a predetermined speed
    • F16D59/02Self-acting brakes, e.g. coming into operation at a predetermined speed spring-loaded and adapted to be released by mechanical, fluid, or electromagnetic means
    • 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
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00Type of actuator operation force
    • F16D2121/18Electric or magnetic
    • F16D2121/20Electric or magnetic using electromagnets
    • F16D2121/22Electric or magnetic using electromagnets for releasing a normally applied brake
    • 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
    • Y10T83/081With randomly actuated stopping means
    • Y10T83/099Manually operated
    • 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
    • Y10T83/121With means to accomplish delayed stopping after cessation of cyclic operation

Description

March 19, 1957 J, ow JR 2;785,7l0

AUTOMATIC BRAKE FOR POWER TOOLS Filed may 3. 1954 fawn/vs TOOL ENTOR INV F|G.i JESSE R. MOWERY,JR.

H will.

United States Patent 7 2,785,710 7 AUTOMATIC BRAKE FOR POWER TOOLS Jesse R. Mowery, In, Lancaster, Pa., assignor to De Walt Inc., a corporation of Pennsylvania Application May 3, 1954, Serial No. 427,22i

Claims. (Cl. 143-157) This invention relates to an improved brake for a power saw, particularly a circular power saw.

In many circular power sa-ws, the saw is mounted directly on the motor arbor and operates at a relatively high R. P. M. When the power is turned off, the motor and saw continue to coast, presenting a safety hazard since an operator is apt to be careless when the power is oil". Furthermore, there is a time loss where one must Wait for the blade to stop before making adjustments.

It has accordingly long been recognized that brake means should be provided so that motor and blade may be stopped simultaneously with turning off the power. Accordingly, it is my invention to provide an automatic braking means engaging the circular blade itself.

It is another object of my invention to apply a brake to the blade itself to prevent throw off.

It is a further object of my invention that the brake is always applied when the power is off.

The novel features which I believe to be characteristic of my invention are set forth with particularity in the appended claims. My invention itself, however, both as to its organization and method of operation may be understood by reference to the apparatus embodying my invention and shown in the accompanying drawing in which 1 illustrate a side elevation, partly, in section, of a power driven rotary tool in conjunction with an automatic braking device.

With reference to the drawing, 1 show a motor 1% driving a rotating shaft 12 supporting a woodworking tool such as a saw blade 14 secured thereon. The saw blade guard 16 is secured to the motor by fastening means 18. The guard 16 has the oppositely facing bores 26 formed in its side walls 22. The flange cylinders 24 are secured in bores 20. These cylinders 24 are adapted to hold the spring-loaded pistons 26 which are urged by the compression springs 28 toward the blade or tool 14. A piston shaft 3% protrudes through and slidingly engages a bore 32 formed in the head of each cylinder 24.

There is secured to the bight 4d of guard 16 a doubleacting solenoid or electromagnet 42 having armature plungers 44. When solenoid 42 is activated, the plungers 44 retract longitudinally toward each other into the solenoid. A lever 34 pivotally fulcrumed on lugs 36 secured to guard 16 connects the ends of plungers 44 to the outw wardly extending ends of piston shafts 39.

In operation, the solenoid 42 is connected across the terminals 11 of motor 14 so as to be energized when switch 13, connected in series between power lines and motor 19, is closed so as to cause operating current to pass through the motor windings (Fig. 2). When so energized the armature shaft-s 44 are moved toward each other, rocking the lever 34 to move pistons 26 and brake shoes 27 against the thrust of compression springs 28 and away from the tool 14.

When, on the other hand, the power is turned oif, the solenoid 42 is de-energized and the springs 28 thrust pistons 26 and brake shoes 27 against the sides of tool 14 with braking force. By applying the brake to the blade itself I prevent a possible throw off which might occur where a braking force is applied to the motor 10 or motor shaft 12 itself.

Having described a working embodiment of my invention, I claim:

1. In combination with a power-driven rotary cutting tool having an electric motor and cutting tool mounted on the armature shaft of said motor, a guard mounted on said motor and about a portion of said cutting tool, said guard having a cylinder positioned longitudinally parallel to the armature of said motor, a piston movable to and fro in said cylinder, a brake shoe secured on one end of said piston to engage said rotary cutting tool when said piston is moved to the forward end of said cylinder, resilient means to urge said piston to said forward end of said cylinder and into braking contact with said rotary tool, a solenoid mounted on said guard, a fulcrumed lever connecting said solenoid to said piston, said solenoid and said lever being operatively positioned to move said piston against said resilient member and out of braking position when said solenoid is energized and means connecting said solenoid across the terminals of said electric motor to energize said solenoid when said motor is energized whereby said braking means may be moved by said resilient means into braking position when said motor is de-energized and said braking means may be moved out of braking position when said motor is energized.

2. In a cutting mach ne having a motor and a rotary cutting tool, a bracket mounted about the edge of said cutting tool, a pair of oppositely positioned members mounted on said bracket movable to effect equal frictional engagement simultaneously on opposite sides of said cutting tool, resilient means on each of said members operative to move said members into frictional engagement with said cutting tool, a double acting solenoid positioned on said bracket beyond said tool and intermediate said members, and a pair of fulcrumed levers pivoted to said bracket and each engaged at its one end to one end of said double acting solenoid and at its other end to one of said movable members to move said members against said yielding means and out of frictional engagement with said cutting tool.

3. in a cutting machine having a motor and a rotary cutting tool, a bracket mounted about the edge of said cutting tool, a pair of oppositely positioned members mounted on said bracket movable to effect equal frictional engagement simultaneously on opposite sides of said cutting tool, resilient means on each of said members operative to move said members into frictional engagement with said cutting tool, a double acting solenoid positioned on said bracket beyond said tool and intermediate said members, a pair of fulcrumed levers pivoted to said bracket and each engaged at its one end to one end of said double acting solenoid and at its other end to one of said movable members to move said members against said yielding means and out of frictional engagement with said cutting tool, and an electrical conductor operatively connected to said solenoid and to said motor to energize said solenoid when said motor is in operation.

4. in a cutting machine having an electric motor and a rotary cutting tool, a bracket mounted about the edge or" said cutting tool, a pair of oppositely positioned members mounted on said bracket movable to effect equal frictional engagement simultaneously on opposite sides of said cutting tool, resilient means on each of said members operative to move said members into frictional engagement with said cutting tool, a double acting solenoid positioned on said bracket beyond said tool and intermediate said members, a pair of fulcrumed levers pivoted to said bracket and each engaged at its one end to one 5. The combination with a power driven rotary cutting tool having an electric motor and a source of elec:

tnic power, a guardmounted about a portion of said rotary tool, a brake shoe mounted on said guard on each side .of said tool movable from a tool engaging position to a non-engaging position, means to move said brake shoes into tool engaging position, a single electro-magnetic means to move said brake shoes out of tool engaging position, and single switch means operative when plosed to pant es; said, motor and said eleetrotnagnetic means to said source of power whereby said brake shoes are uniformly moved out of engaging position during the operation of said motor and uniformly released into braking position when said switch means is opened to stop said motor.

References Cited the tile of this patent UNITED STATES PATENTS 1,282,483 Steen Oct. 22, 1918 1,811,066 Tannewitz a y a June 23, 193 1 FQREIGN PATENTS 485,143 Germany Nov. 27, 1929

US2785710A 1954-05-03 1954-05-03 Automatic brake for power tools Expired - Lifetime US2785710A (en)

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Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2801714A (en) * 1956-06-29 1957-08-06 Meadville Res Products Corp Heat insulating friction shoe and piston unit
US2960190A (en) * 1959-02-24 1960-11-15 Molon Motor & Coil Corp Motor brake
US2984268A (en) * 1958-07-07 1961-05-16 George E Vuichard Manually-actuated saw brake
US3103990A (en) * 1960-11-01 1963-09-17 Thomas J Pierson Hydraulic disc brake
US3124219A (en) * 1964-03-10 Disc brake assembly
US3184003A (en) * 1961-05-15 1965-05-18 Lambert & Brake Corp Brake structure
US3322240A (en) * 1965-03-19 1967-05-30 Mallory & Co Inc P R Disc brake for washing machine
US3417843A (en) * 1966-10-26 1968-12-24 Ingersoll Rand Canada Disc brake for mine hoists
US3703654A (en) * 1971-06-30 1972-11-21 Ralph Karubian Hand tool with magnetic brake
US4145940A (en) * 1978-01-26 1979-03-27 Woloveke Eugene L Brake apparatus for a motor driven saw blade
DE2952253A1 (en) * 1979-01-12 1980-07-24 Asahi Seimitsu Kk Pre-adjustable braking device for a character-machine
EP0042918A1 (en) * 1980-06-28 1982-01-06 Robert Bosch Gmbh Hand tool operated by an electric motor
US4335514A (en) * 1980-08-08 1982-06-22 Black & Decker Inc. Switch-brake interlock for chain saw
EP0465831A1 (en) * 1990-07-12 1992-01-15 Inventio Ag Safety disc brake for elevators
DE19750819A1 (en) * 1997-11-17 1999-05-20 Kocks Technik Tube and long stock cutting machine using powered disc tool
US6092448A (en) * 1997-01-17 2000-07-25 Premark Feg L.L.C. Slicer with staged dynamic braking system
US20020017184A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Table saw with improved safety system
US20030005588A1 (en) * 2001-07-03 2003-01-09 Gass Stephen F. Actuators for use in fast-acting safety systems
US6813983B2 (en) 2000-09-29 2004-11-09 Sd3, Llc Power saw with improved safety system
US6826988B2 (en) 2000-09-29 2004-12-07 Sd3, Llc 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
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
US7000514B2 (en) 2001-07-27 2006-02-21 Sd3, Llc Safety systems for band saws
US7077039B2 (en) 2001-11-13 2006-07-18 Sd3, Llc Detection system for power equipment
US20060159539A1 (en) * 2005-01-19 2006-07-20 The Boeing Company (De Corporation) Automatic position-locking tool carrier apparatus and method
US7197969B2 (en) 2001-09-24 2007-04-03 Sd3, Llc Logic control with test mode for fast-acting safety system
US7231856B2 (en) 2001-06-13 2007-06-19 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US20070186737A1 (en) * 1999-10-01 2007-08-16 Gass Stephen F Brake mechanism for power equipment
US20070240786A1 (en) * 2000-08-14 2007-10-18 Gass Stephen F Motion detecting system for use in a safety system for power equipment
US20080092702A1 (en) * 2000-08-14 2008-04-24 Gass Stephen F Spring-biased brake mechanism for power equipment
US7377199B2 (en) 2000-09-29 2008-05-27 Sd3, Llc Contact detection system for power equipment
JP2008281138A (en) * 2007-05-11 2008-11-20 Kayaba Ind Co Ltd Caliper brake device for railway rolling stock
US7481140B2 (en) 2005-04-15 2009-01-27 Sd3, Llc Detection systems for power equipment
US7610836B2 (en) 2000-08-14 2009-11-03 Sd3, Llc Replaceable brake mechanism for power equipment
US7644645B2 (en) 2002-01-16 2010-01-12 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US20100089212A1 (en) * 2000-08-14 2010-04-15 Gass Stephen F Logic control for fast-acting safety system
US7707920B2 (en) 2003-12-31 2010-05-04 Sd3, Llc Table saws with safety systems
US7784507B2 (en) 2000-09-29 2010-08-31 Sd3, Llc Router with improved safety system
US7827890B2 (en) 2004-01-29 2010-11-09 Sd3, Llc Table saws with safety systems and systems to mount and index attachments
US7832314B2 (en) 2000-08-14 2010-11-16 Sd3, Llc Brake positioning system
US7836804B2 (en) 2003-08-20 2010-11-23 Sd3, Llc Woodworking machines with overmolded arbors
US7895927B2 (en) 1999-10-01 2011-03-01 Sd3, Llc Power equipment with detection and reaction systems
US7991503B2 (en) 2003-12-31 2011-08-02 Sd3, Llc Detection systems for power equipment
US8061245B2 (en) 2000-09-29 2011-11-22 Sd3, Llc Safety methods for use in power equipment
US8065943B2 (en) 2000-09-18 2011-11-29 Sd3, Llc Translation stop for use in power equipment
US8100039B2 (en) 2000-08-14 2012-01-24 Sd3, Llc Miter saw with safety system
US8459157B2 (en) 2003-12-31 2013-06-11 Sd3, Llc Brake cartridges and mounting systems for brake cartridges
US9724840B2 (en) 1999-10-01 2017-08-08 Sd3, Llc Safety systems for power equipment
US9927796B2 (en) 2001-05-17 2018-03-27 Sawstop Holding Llc Band saw with improved safety system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1168355A (en) * 1910-02-07 1916-01-18 Alvey Ferguson Co Electric bone-saw.
US1282483A (en) * 1916-10-02 1918-10-22 Allis Chalmers Mfg Co Compound band-brake.
DE485143C (en) * 1929-11-27 Wilhelm Follender Grossfeld Brake pad mounting
US1811066A (en) * 1929-02-23 1931-06-23 Carl E Tannewitz Sawing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE485143C (en) * 1929-11-27 Wilhelm Follender Grossfeld Brake pad mounting
US1168355A (en) * 1910-02-07 1916-01-18 Alvey Ferguson Co Electric bone-saw.
US1282483A (en) * 1916-10-02 1918-10-22 Allis Chalmers Mfg Co Compound band-brake.
US1811066A (en) * 1929-02-23 1931-06-23 Carl E Tannewitz Sawing machine

Cited By (91)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124219A (en) * 1964-03-10 Disc brake assembly
US2801714A (en) * 1956-06-29 1957-08-06 Meadville Res Products Corp Heat insulating friction shoe and piston unit
US2984268A (en) * 1958-07-07 1961-05-16 George E Vuichard Manually-actuated saw brake
US2960190A (en) * 1959-02-24 1960-11-15 Molon Motor & Coil Corp Motor brake
US3103990A (en) * 1960-11-01 1963-09-17 Thomas J Pierson Hydraulic disc brake
US3184003A (en) * 1961-05-15 1965-05-18 Lambert & Brake Corp Brake structure
US3322240A (en) * 1965-03-19 1967-05-30 Mallory & Co Inc P R Disc brake for washing machine
US3417843A (en) * 1966-10-26 1968-12-24 Ingersoll Rand Canada Disc brake for mine hoists
US3703654A (en) * 1971-06-30 1972-11-21 Ralph Karubian Hand tool with magnetic brake
US4145940A (en) * 1978-01-26 1979-03-27 Woloveke Eugene L Brake apparatus for a motor driven saw blade
US4315371A (en) * 1979-01-12 1982-02-16 Asahi Seimitsu Kabushiki Kaisha Preset brake device for line drawing machine, drafting machine or like
DE2952253A1 (en) * 1979-01-12 1980-07-24 Asahi Seimitsu Kk Pre-adjustable braking device for a character-machine
EP0042918A1 (en) * 1980-06-28 1982-01-06 Robert Bosch Gmbh Hand tool operated by an electric motor
US4335514A (en) * 1980-08-08 1982-06-22 Black & Decker Inc. Switch-brake interlock for chain saw
EP0465831A1 (en) * 1990-07-12 1992-01-15 Inventio Ag Safety disc brake for elevators
US5253738A (en) * 1990-07-12 1993-10-19 Inventio Ag Safety disc brake for lifts
US6092448A (en) * 1997-01-17 2000-07-25 Premark Feg L.L.C. Slicer with staged dynamic braking system
DE19750819A1 (en) * 1997-11-17 1999-05-20 Kocks Technik Tube and long stock cutting machine using powered disc tool
US20070186737A1 (en) * 1999-10-01 2007-08-16 Gass Stephen F Brake mechanism for power equipment
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
US7788999B2 (en) 1999-10-01 2010-09-07 Sd3, Llc Brake mechanism for power equipment
US7661343B2 (en) 1999-10-01 2010-02-16 Sd3, Llc Brake mechanism for power equipment
US7895927B2 (en) 1999-10-01 2011-03-01 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
US9925683B2 (en) 1999-10-01 2018-03-27 Sawstop Holding Llc Table saws
US8408106B2 (en) 1999-10-01 2013-04-02 Sd3, Llc Method of operating power equipment with detection and reaction systems
US8196499B2 (en) 1999-10-01 2012-06-12 Sd3, Llc Power equipment with detection and reaction systems
US6957601B2 (en) 2000-08-14 2005-10-25 Sd3, Llc Translation stop for use in power equipment
US8151675B2 (en) 2000-08-14 2012-04-10 Sd3, Llc Logic control for fast-acting safety system
US8100039B2 (en) 2000-08-14 2012-01-24 Sd3, Llc Miter saw with safety system
US8011279B2 (en) 2000-08-14 2011-09-06 Sd3, Llc Power equipment with systems to mitigate or prevent injury
US8191450B2 (en) 2000-08-14 2012-06-05 Sd3, Llc Power equipment with detection and reaction systems
US20070240786A1 (en) * 2000-08-14 2007-10-18 Gass Stephen F Motion detecting system for use in a safety system for power equipment
US20100089212A1 (en) * 2000-08-14 2010-04-15 Gass Stephen F Logic control for fast-acting safety system
US7350444B2 (en) * 2000-08-14 2008-04-01 Sd3, Llc Table saw with improved safety system
US20080092702A1 (en) * 2000-08-14 2008-04-24 Gass Stephen F Spring-biased brake mechanism for power equipment
US7958806B2 (en) 2000-08-14 2011-06-14 Sd3, Llc Replaceable brake mechanism for power equipment
US7921754B2 (en) 2000-08-14 2011-04-12 Sd3, Llc Logic control for fast-acting safety system
US7908950B2 (en) 2000-08-14 2011-03-22 Sd3 Table saw with improved safety system
US7610836B2 (en) 2000-08-14 2009-11-03 Sd3, Llc Replaceable brake mechanism for power equipment
US7640837B2 (en) 2000-08-14 2010-01-05 Sd3, Llc Table saw with improved safety system
US8490527B2 (en) 2000-08-14 2013-07-23 Sd3, Llc Power equipment with systems to mitigate or prevent injury
US8522655B2 (en) 2000-08-14 2013-09-03 Sd3, Llc Logic control for fast-acting safety system
US7681479B2 (en) 2000-08-14 2010-03-23 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US9038515B2 (en) 2000-08-14 2015-05-26 Sd3, Llc Logic control for fast-acting safety system
US20020017184A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Table saw with improved safety system
US20100192741A1 (en) * 2000-08-14 2010-08-05 Gass Stephen F Table saw with improved safety system
US20100132523A1 (en) * 2000-08-14 2010-06-03 Gass Stephen F Replaceable brake mechanism for power equipment
US7832314B2 (en) 2000-08-14 2010-11-16 Sd3, Llc Brake positioning system
US8065943B2 (en) 2000-09-18 2011-11-29 Sd3, Llc Translation stop for use in power equipment
US7784507B2 (en) 2000-09-29 2010-08-31 Sd3, Llc Router with improved safety system
US7377199B2 (en) 2000-09-29 2008-05-27 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
US8186255B2 (en) 2000-09-29 2012-05-29 Sd3, Llc Contact detection system for power equipment
US6994004B2 (en) 2000-09-29 2006-02-07 Sd3, Llc Table saw with improved safety system
US6945148B2 (en) 2000-09-29 2005-09-20 Sd3, Llc Miter saw with improved safety system
US8061245B2 (en) 2000-09-29 2011-11-22 Sd3, Llc Safety methods for use in power equipment
US9927796B2 (en) 2001-05-17 2018-03-27 Sawstop Holding Llc Band saw with improved safety system
US7231856B2 (en) 2001-06-13 2007-06-19 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7712403B2 (en) * 2001-07-03 2010-05-11 Sd3, Llc Actuators for use in fast-acting safety systems
US20030005588A1 (en) * 2001-07-03 2003-01-09 Gass Stephen F. Actuators for use in fast-acting safety systems
US7000514B2 (en) 2001-07-27 2006-02-21 Sd3, Llc Safety systems for band saws
US7197969B2 (en) 2001-09-24 2007-04-03 Sd3, Llc Logic control with test mode for fast-acting safety system
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
US8430005B2 (en) * 2002-01-14 2013-04-30 Sd3, Llc Miter saw with improved safety system
US8061246B2 (en) * 2002-01-14 2011-11-22 Sd3, Llc Miter saw with improved safety system
US20120137848A1 (en) * 2002-01-14 2012-06-07 Gass Stephen F Miter saw with improved safety system
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