GB1456014A - Chain saw - Google Patents

Chain saw

Info

Publication number
GB1456014A
GB1456014A GB2691475A GB2691475A GB1456014A GB 1456014 A GB1456014 A GB 1456014A GB 2691475 A GB2691475 A GB 2691475A GB 2691475 A GB2691475 A GB 2691475A GB 1456014 A GB1456014 A GB 1456014A
Authority
GB
United Kingdom
Prior art keywords
brake
chain
movement
inertial
operating means
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
Application number
GB2691475A
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.)
Textron Inc
Original Assignee
Textron Inc
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 Textron Inc filed Critical Textron Inc
Publication of GB1456014A publication Critical patent/GB1456014A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/08—Drives or gearings; Devices for swivelling or tilting the chain saw
    • B27B17/083—Devices for arresting movement of the saw chain
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D49/00—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like
    • F16D49/02—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like shaped as a helical band or coil with more than one turn, with or without intensification of the braking force by the tension of the band or contracting member
    • F16D49/04—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like shaped as a helical band or coil with more than one turn, with or without intensification of the braking force by the tension of the band or contracting member mechanically actuated

Abstract

1456014 Chain saws TEXTRON Inc 25 June 1975 [25 June 1974] 26914/75 Heading B5L A chain saw comprises a rotatable drum 4 a chain driving sprocket 3 fixed to the drum and a chain brake for stopping the cutting chain quickly in the event of "kickback", the brake comprising a flexible brake band 5 engageable with the drum, means 6 anchoring one end 5d of the brake band, the brake band extending around the drum from the anchoring means in the direction of rotation of the drum, operating means 8 acting on the other end 5c, 10 of the brake band and movable between a brake releasing condition as shown in Fig. 1 and a brake applying condition as shown in Fig. 3, inertial means 12, 15 operatively associated with and controlling the operating means and responsive to sudden movement of the chain saw of predetermined acceleration, direction and duration to cause movement of the operating means from brake releasing condition to brake applying condition and spring means 18 acting between the inertial means 12 and the operating means 8: (a) to retain the inertial means and operating means in brake releasing condition, (b) to restore the inertial means and operating means to brake releasing condition in the event of movement of the chain saw less than said predetermined sudden movement and (c) to retain the inertial means and operating means in brake-applying condition when moved thereto, means 15 being provided for manually resetting the brake, an initial portion of the resetting movement being against the bias of the spring 18 and the final portion assisted thereby. The inertial means comprises a tubular hand guard 15 mounted on a pivotal member 12 the eccentricity of the weight of the guard 15 relative to the pivot 14 providing for relative pivotal movement in the event of a "kickback" to actuate the brake applying means. Furthermore the guard 15 is so disposed relative to the handle H (shown dotted) of the saw that in the event of "kickback" the guard 15 may be contacted by the wrist of the chain operator to assist in causing pivotal movement of the guard relative to the saw.
GB2691475A 1974-06-25 1975-06-25 Chain saw Expired GB1456014A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US483034A US3923126A (en) 1974-06-25 1974-06-25 Band type brake for a chain saw

Publications (1)

Publication Number Publication Date
GB1456014A true GB1456014A (en) 1976-11-17

Family

ID=23918379

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2691475A Expired GB1456014A (en) 1974-06-25 1975-06-25 Chain saw

Country Status (8)

Country Link
US (1) US3923126A (en)
JP (1) JPS5239199B2 (en)
BR (1) BR7503806A (en)
CA (1) CA1027882A (en)
DE (1) DE2527812C2 (en)
GB (1) GB1456014A (en)
NO (1) NO143090C (en)
SE (1) SE426454B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103821839A (en) * 2012-11-19 2014-05-28 通用汽车环球科技运作有限责任公司 Transmission with band clutch

Families Citing this family (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026392A (en) * 1974-10-15 1977-05-31 Mcculloch Corporation Snap-acting over-center chain saw safety brake and method of operation thereof
US3964333A (en) * 1974-10-15 1976-06-22 Mcculloch Corporation Safety braking mechanism for a portable chain saw
US3974566A (en) * 1975-09-08 1976-08-17 Mcculloch Corporation Method and apparatus for arresting movement of a chain saw cutter chain
DE2602247C2 (en) * 1976-01-22 1992-04-23 Fa. Andreas Stihl, 7050 Waiblingen Braking device on a motor-driven hand saw, in particular a motor chain saw
JPS52100964A (en) * 1976-02-20 1977-08-24 Hitachi Ltd 1-bit encoder
JPS52135899U (en) * 1976-04-09 1977-10-15
JPS5319891U (en) * 1976-07-30 1978-02-20
JPS5319892U (en) * 1976-07-30 1978-02-20
JPS5325998A (en) * 1976-08-23 1978-03-10 Kyoritsu Kk Safety device of chain saw
JPS5850981Y2 (en) * 1980-05-12 1983-11-21 株式会社 共立 Chain saw safety braking device
JPS5916921B2 (en) * 1981-04-13 1984-04-18 株式会社共立 Chain saw emergency braking device
SE8202949L (en) * 1982-05-11 1983-11-12 Electrolux Motor Ab BROMSUTLOSNINGSMEKANISM
DE3244772A1 (en) * 1982-12-03 1984-06-07 Fa. Andreas Stihl, 7050 Waiblingen CHAINSAW
SE457626B (en) * 1983-07-08 1989-01-16 Stihl Maschf Andreas KEDJEBROMANORDNING
DE3419152A1 (en) * 1984-05-23 1985-11-28 Fa. Andreas Stihl, 7050 Waiblingen Chain-braking device
JPS6032601A (en) * 1983-08-01 1985-02-19 株式会社共立 Safety brake gear for chain saw
DE3608523A1 (en) * 1986-03-14 1987-09-17 Bosch Gmbh Robert QUICK STOP DEVICE FOR STOPPING A SAW CHAIN OF A PORTABLE MOTOR CHAIN SAW
US5125160A (en) * 1991-05-15 1992-06-30 Textron Inc. Power tool inertia brake
JP3263284B2 (en) * 1995-09-04 2002-03-04 株式会社マキタ Electric chainsaw
SE511397C2 (en) * 1996-10-25 1999-09-20 Electrolux Ab Brake device in a chainsaw
JP3601934B2 (en) * 1997-05-16 2004-12-15 株式会社共立 Braking device for power work equipment
US6108916A (en) 1998-08-14 2000-08-29 Milwaukee Electric Tool Corporation Movable handle for a power tool
DE10261743A1 (en) * 2002-12-30 2004-07-22 Robert Bosch Gmbh Manual circular saw B27B
US20040181951A1 (en) * 2003-03-17 2004-09-23 Wittke Edward R. Chain saw safety system
CA2423282A1 (en) * 2003-03-19 2004-09-19 Universite De Sherbrooke Anti-vibration handle for punching or reciprocating motion tools
CA493745A (en) * 2006-10-04 1953-06-16 E. Glassburn William Bridge-connected relay
US8176643B2 (en) * 2006-10-19 2012-05-15 Husqvarna Zenoah Co Ltd. Brake system of chain saw and chain saw
WO2008061198A2 (en) 2006-11-15 2008-05-22 Milwaukee Electric Tool Corporation Power tool
FR2935496B1 (en) * 2008-08-29 2014-05-16 Pellenc Sa METHOD FOR STOPPING PORTABLE TOOLS DURING UNEXPECTED BRUSH MOVEMENTS, AND PORTABLE TOOLS BY APPLYING
US8752301B2 (en) 2009-04-08 2014-06-17 Rex George Chainsaw incorporating a safety device system
JP5448569B2 (en) * 2009-05-21 2014-03-19 株式会社やまびこ Brush cutter with safety device
JP5448568B2 (en) * 2009-05-21 2014-03-19 株式会社やまびこ Work machine with safety device
CN103068537A (en) * 2010-08-11 2013-04-24 布楼恩特公司 Kickback detection method and apparatus
CN110944799B (en) 2017-07-24 2021-11-26 费斯托工具有限责任公司 Power tool and method
KR102613417B1 (en) 2017-07-24 2023-12-14 페스툴 게엠베하 Electric tool and method for identifying an event and/or state of an electric tool
EP3621777B1 (en) 2017-07-24 2022-07-13 Festool GmbH Electric tool and method for identifying a kickback event of an electric tool
US11529725B2 (en) 2017-10-20 2022-12-20 Milwaukee Electric Tool Corporation Power tool including electromagnetic clutch
CN213616506U (en) 2017-10-26 2021-07-06 米沃奇电动工具公司 Electric tool
US11641102B2 (en) 2020-03-10 2023-05-02 Smart Wires Inc. Modular FACTS devices with external fault current protection within the same impedance injection module

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2299765A (en) * 1930-10-29 1942-10-27 Carl F Rauen Means for preventing retrograde movement of motor vehicles and the like
US3405791A (en) * 1966-08-25 1968-10-15 Kaplan Joseph Variable-torque slip device
US3485327A (en) * 1967-10-20 1969-12-23 Mcculloch Corp Inertia actuated safety brake
SE390131B (en) * 1971-04-13 1976-12-06 Partner Ab BRAKE DEVICE FOR MOTORSAWS
US3739475A (en) * 1971-10-19 1973-06-19 Mc Culloch Corp Chain saw safety method and apparatus
US3785465A (en) * 1972-02-22 1974-01-15 R Johansson Centrifugal clutches in series with brake
US3793727A (en) * 1972-10-04 1974-02-26 Mcculloch Corp Chain saw safety method and apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103821839A (en) * 2012-11-19 2014-05-28 通用汽车环球科技运作有限责任公司 Transmission with band clutch

Also Published As

Publication number Publication date
CA1027882A (en) 1978-03-14
NO143090C (en) 1980-12-17
BR7503806A (en) 1976-07-06
JPS5239199B2 (en) 1977-10-04
SE7506970L (en) 1975-12-29
DE2527812A1 (en) 1976-01-15
NO143090B (en) 1980-09-08
SE426454B (en) 1983-01-24
NO752209L (en) 1975-12-30
DE2527812C2 (en) 1986-02-20
US3923126A (en) 1975-12-02
JPS5117097A (en) 1976-02-10

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940625