US3776331A - Brake-device for power saws - Google Patents

Brake-device for power saws Download PDF

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Publication number
US3776331A
US3776331A US00242978A US3776331DA US3776331A US 3776331 A US3776331 A US 3776331A US 00242978 A US00242978 A US 00242978A US 3776331D A US3776331D A US 3776331DA US 3776331 A US3776331 A US 3776331A
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US
United States
Prior art keywords
brake
pawl
saw
drum
driving mechanism
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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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US00242978A
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English (en)
Inventor
L Gustafsson
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Partner AB
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Partner AB
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Publication date
Application filed by Partner AB filed Critical Partner AB
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Publication of US3776331A publication Critical patent/US3776331A/en
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    • 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
    • F16D49/08—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like shaped as an encircling band extending over approximately 360 degrees
    • F16D49/10—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like shaped as an encircling band extending over approximately 360 degrees mechanically actuated
    • 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

Definitions

  • a brake device for power saws having a supporting ABSTRACT handle and a driving mechanism drum with a trigger means operable by an operators hand moving from said handle and striking a pivotal yoke adjacent said handle when the saw is inadvertently flung to one side during use, which yoke releases a pawl means normally retaining braking means around the drum in a non-braking position to allow resilient means to move the braking means to a drum braking position.
  • the present invention relates to a brake device for power saws especially power chain saws comprising a friction brake for the driving mechanism of thesaw chain arranged to be actuated by means of a feeler organ provided to react when an accident is threatening, for example by means of a trigger organ on one of the handles of the saw, against which trigger organ the hand of the operator of the saw is striking at a flinging movement of the saw.
  • protection means intended to bring the chain to stop at a sudden fling of the saw.
  • Such a protection means is by way of example known from the Swedish patent specification N9. 313 172 and comprises a feeler organ against which the hand of the saw operator will strike, in case it looses its grip of the bow handle. At the strike the feeler organ being displaced brings the internal combustion enginefor the chain saw drive to a stop by actuation of an ignition switch. Further there is an embodiment of a saw known, in which this protection means is combined with a friction brake acting upon the chain driving mechanism and actuated by the feeler organ. Said brake device has been made in order to reduce the time elapsed between the strike of the hand against the feeler organ and the standstill of the chain. The power to produce the brake action is taken from the strike of the hand against the feeler organ. Other solutions are known from the US. Pat.
  • the objects of the invention are obtained by providing the brake to be kept in non-active position by means of a blocking mechanism and in said position subjected to the force of a spring which force is adjusted according to a predetermined braking time, and by that the feeler organ being arranged to bring the blocking mechanism to release the brake so that the spring actuates the same.
  • FIG. 1 is a perspective view of a chain saw, power driven by an internal combustion engine and
  • FIG. 2 is a side elevational view of a cover supporting the brake device, seen from the inside.
  • the body 1 of the saw encloses an internal combustion engine. Said body is during the work held in a rear handle 2, provided with a throttle finger control and in a front handle shaped as a bow handle 3. From the body 1 of the saw, a bar 4 projects, around which a saw chain 5 runs in the direction of the arrow in theillustration. As is shown by means of broken lines a drum 7 is located inside a cover 6. On the drum a sprocket wheel is mounted for the drive of the chain 5 which is stretching around the wheel.
  • the drum 7 is free-wheeling on the propulsion shaft of the motor, but is provided to be driven by said shaft by means of a centrifugal clutch including friction blocks in the drum 7 which are flung outwards against the inner wall of the drum, when the crankshaft has reached a certain speed.
  • the cover 6 is arranged to retain the bar 4 by means of a plate 9 arranged for this purpose and pressed against the sword 4 by means of two nuts 8 threaded on stud bolts. (FIG. 2).
  • the design described above is well known from all common power saws, and it should therefore not be necessary to make a more detailed description than the one above.
  • the cover 6 supports a feeler organ in the shape of a tubular yoke 10.
  • the outer portion of the tubular yoke 10 is located in front of the portion of the bow handle 3, which constitutes a grip for the hand, when the saw is used for pruning and similar operations.
  • the tubular yoke 10 and the bow handle 3 here extend parallel to each other at a distance permitting the introduction of a hand gripping around thebow handle 3.
  • the yoke 10 is designed in such a manner that its uppermost portion is located above the bow handle 3.
  • the yoke 10 is pivotably mounted in a bearing 11 in the cover 6 by means of a pivot 12 which is resiliently held in the position mentioned above and illustrated in the drawings.
  • the pivot 12 is arranged for radial as well as axial journalling and supports two projecting pins 13 and 14.
  • the location of the outer periphery of the coupling drum 7 when the cover 6is mounted on the saw, is also evident from FIG 2.
  • a brake band 16 provided with a brake lining 15.
  • One of the ends of the band is fastened to a projection 17 of the cover 6 and the other part is fastened to a lever arm 18 which is pivotably mounted in a bearing 19 of the cover 6.
  • the brake band 16 occupies the position mentioned at a distance from the periphery of the drum 7 and is thereby supported by two shoulders 20, 21 and the plate 9 of the cover 6.
  • a tension spring 23 is hooked to the same end of the lever arm 18 to which the brake band 16 is attached, the other end of said spring being hooked to a projection 22 of the cover 6.
  • the tension spring 23 is extended, thus tending to pivot the lever arm clockwise (as seen in FIG. 2) around its bearing 19.
  • a pawl 24 which tends to pivot counterclockwise around a bearing 25 biased by a torsion spring 26, whereby its nose is kept against a ratcher surface 27 of an angular recess in the lever arm 18.
  • the pin 13 In the normal position of the tubular yoke 10 the pin 13 is immediately above the pawl 24.
  • the purpose to create the possibility of effectuating a brake operation to standstill within a predetermined time limit is obtained by the brake being actuated by discharge of a spring force, produced by a spring device which is adjustable.
  • the purpose of producing the least possible strain on the driving mechanism in spite of the rapid braking action is according to the embodiment obtained by designing the brake as a friction brake, designed for a lowering of the necessary force for the ac tuating by means of a moderately friction driving.
  • the same result can be obtained by employing other types of friction brakes, by way of example shoe brakes.
  • the feeler organ for the triggering of the brake i.e., the tubular yoke 10 can also be of other designs than the shown, by way of example a design in which a mass by means of its inertia produces the necessary movement for the triggering of the brake when the saw is sub jected to a fling.
  • Brake device for power saws especially power chain saws comprising a friction brake for the driving mechanism of the saw, spring means tending to bring said brake to braking position, trigger means positioned on the saw at one of the handles of the saw, pawl means connected to said brake, further spring means connected to and tending to bring said pawl means into a position in which it holds said brake in a non-braking position, said trigger means being capable of moving said pawl means out of engagement with said brake and leave it free to move to the braking position under the force of said first spring means when said trigger means is moved from the normal position to the second position which it would reach when struck by the hand of the saw operator at an occasional flinging movement of the saw tool.
  • said brake is a brake band acting upon a cylindrical part of the driving mechanism of the saw, one end of said band as seen in the intended direction of rotation of said part of the driving mechanism having a fixed point of attachment relative to the bearing of the cylindrical part, a pivotally mounted lever connected to said first spring and the other end of said brake band and cooperating with said pawl means.
  • Brake device for power saws especially power chain saws comprising a friction brake for the driving mechanism of the saw, spring means tending to bring said brake to braking position, trigger means positioned at one of the handles of the saw and movable between a normal position in which said brake is leaving the driving mechanism free to run and a second position in which said brake is activated, pawl means connected to said brake, further spring means connected to and capable of bringing said pawl means in a position in which it holds said brake in a non-braking position, said trigger means being capable of moving said pawl means out of engagement with said brake when said trigger means is moved from a normal position to a second position, said means comprising an arm pivotally mounted adjacent to said pawl means, an element carried by said arm outside of the pivoting axis of said arm and capable of acting upon said pawl to bring the same out its brakeholding position when said arm is pivoted by the moving of the trigger means to the second position.
  • Brake device for power saws which have a front handle, cover and a driving mechanism which includes a friction drive clutch provided with a cylindrical drum, and comprising a friction brake for the driving mechanism, spring means connected to and tending to bring said brake to braking position, trigger means at one of the handles of the saw movable between a normal'posihaving a portion extending near to the handle and being mounted in a bearing on the cover enclosing the drum and said brake being a band brake provided to act upon the clutch drum and said band brake being enclosed and carried in the cover.
  • a drum brake device comprising a yoke pivotally mounted on said cover and extending adjacent the supporting handle, a lever pivotally mounted in said cover and having a ratchet surface, a brake band encircling the drum and connected at one end to the cover and at its other end to said lever, resilient means tending to move said brake band to a drum braking position, a pawl pivotally mounted on the cover and normally engaging said ratchet surface holding said lever in a position retaining said brake band in a non-braking position against the pull of said resilient means, second resilient means tending to hold said pawl in its ratchet surface engaging position, and said yoke having projections, one projection positioned for moving said pawl out of its ratchet surface engaging position when said yoke is pivoted from the handle and the second projection positioned for moving said lever to its nonbraking position when said yoke is moved towards the handle.
US00242978A 1971-04-13 1972-04-11 Brake-device for power saws Expired - Lifetime US3776331A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7104771A SE390131B (sv) 1971-04-13 1971-04-13 Bromsanordning vid motorsagar

Publications (1)

Publication Number Publication Date
US3776331A true US3776331A (en) 1973-12-04

Family

ID=20264933

Family Applications (1)

Application Number Title Priority Date Filing Date
US00242978A Expired - Lifetime US3776331A (en) 1971-04-13 1972-04-11 Brake-device for power saws

Country Status (6)

Country Link
US (1) US3776331A (sv)
JP (1) JPS5316157B1 (sv)
CA (1) CA976847A (sv)
DE (1) DE2217707C3 (sv)
GB (1) GB1385216A (sv)
SE (1) SE390131B (sv)

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839795A (en) * 1973-04-26 1974-10-08 Mc Culloch Corp Chain saw safety method and apparatus
US3923126A (en) * 1974-06-25 1975-12-02 Textron Inc Band type brake for a chain saw
US3934345A (en) * 1974-10-15 1976-01-27 Mcculloch Corporation Snap-acting over-center chain saw safety brake and method of operation thereof
US3937306A (en) * 1973-08-29 1976-02-10 Husqvarna Ab Automatic brake actuator for a chain saw
US3961433A (en) * 1974-06-21 1976-06-08 The Raymond Lee Organization Inc. Picture poster viewer
FR2291697A1 (fr) * 1974-11-22 1976-06-18 Kaaz Machinery Co Ltd Faucheuse-debroussailleuse portative
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
US3991864A (en) * 1973-10-25 1976-11-16 Andreas Stihl Maschinenfabrik Motor saw, especially motor chain saw
US3991469A (en) * 1974-10-15 1976-11-16 Mcculloch Corporation Safety braking mechanism for a portable chain saw
US3992779A (en) * 1973-12-21 1976-11-23 Textron, Inc. Chain brake for chain saw
US4026392A (en) * 1974-10-15 1977-05-31 Mcculloch Corporation Snap-acting over-center chain saw safety brake and method of operation thereof
US4057900A (en) * 1975-06-04 1977-11-15 Ab Partner Power saw
US4059895A (en) * 1974-10-15 1977-11-29 Mcculloch Corporation Full position safety brake for portable chain saw
US4091896A (en) * 1976-01-22 1978-05-30 Firma Andreas Stihl Chain saw braking mechanism
US4121339A (en) * 1977-08-10 1978-10-24 Milovan Nikolich Safety brake mechanism for chain saws
US4156477A (en) * 1977-09-14 1979-05-29 Kioritz Corporation Braking system of chain saw
US4197640A (en) * 1978-09-18 1980-04-15 Beaird-Poulan Division, Emerson Electric Co. Safety braking apparatus for portable chain saw
US4246701A (en) * 1978-05-18 1981-01-27 Jonsereds Ab Safety braking device for a portable power saw
US4310972A (en) * 1979-12-28 1982-01-19 Trail Manufacturing Limited Brake control assembly
US4334357A (en) * 1980-08-08 1982-06-15 Black & Decker Inc. Safety braking apparatus for a portable chain saw
US4474269A (en) * 1981-06-04 1984-10-02 Andreas Stihl Braking device for a power chain saw
DE3324628A1 (de) * 1983-07-08 1985-01-17 Fa. Andreas Stihl, 7050 Waiblingen Kettenbrems-vorrichtung
US4586588A (en) * 1983-08-01 1986-05-06 Kioritz Corporation Chain saw safety-brake system
US4630372A (en) * 1983-09-07 1986-12-23 Kioritz Corporation Front handle support means of portable chain saw
US4651423A (en) * 1986-04-23 1987-03-24 Grogan Victor A Chain saw cutting chain safety stop
US4721193A (en) * 1984-10-18 1988-01-26 Kioritz Corporation Emergency braking system of chain saw
AU576035B2 (en) * 1985-01-29 1988-08-11 Kenneth Wallmark Braking device for chain saw
US4793064A (en) * 1986-05-02 1988-12-27 Kioritz Corporation Chain saw safety braking device
US6094822A (en) * 1998-02-26 2000-08-01 Andreas Stihl Ag & Co. Hedge clippers
US6814192B2 (en) * 2001-02-07 2004-11-09 Dolmar Gmbh Device for braking a motor shaft
US20060060439A1 (en) * 2004-09-22 2006-03-23 Norio Shirokoshi Brake-equipped retracting mechanism for retractable member
US20060102437A1 (en) * 2004-11-17 2006-05-18 Masato Nara Brake system of working machine
US20070011888A1 (en) * 2005-07-12 2007-01-18 Myers Kent J Chainsaw throttle and brake mechanisms
US20070295298A1 (en) * 2004-11-15 2007-12-27 Dolmar Gmbh Starting Brake for a Hedge Clipper
US20080283650A1 (en) * 2005-06-29 2008-11-20 Norio Shirokoshi Brake-Equipped Retracting Device for Retractable Member
US20150260241A1 (en) * 2012-10-03 2015-09-17 Hilti Aktiengesellschaft Hand-Operated Tool Device With A Brake Mechanism For Braking A Machining Tool
US20150258703A1 (en) * 2012-10-03 2015-09-17 Hilti Aktiengesellschaft Hand-Held Tool Apparatus with a Braking Device for Braking of a Machining Tool
US20150258658A1 (en) * 2012-10-03 2015-09-17 Hilti Aktiengesellschaft Hand-Held Tool Apparatus with a Braking Device for Braking a Machining Tool
CN112352651A (zh) * 2020-11-20 2021-02-12 永康市南征工贸股份有限公司 一种可调节式防意外伤人的电动链锯

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1028227A (en) * 1974-10-15 1978-03-21 Robert E. Frederickson Safety braking mechanism for a portable chain saw
JPS57159258U (sv) * 1981-03-30 1982-10-06
FR2517586A1 (fr) * 1981-12-09 1983-06-10 Trail Manufacturing Ltd Ensemble de commande de frein pour tronconneuse
SE8300200L (sv) * 1982-01-18 1983-07-19 Sachs Dolmar Gmbh Bromsanordning for bromsning av sagkedjan vid en berbar motorsagskedja
DE3608523A1 (de) * 1986-03-14 1987-09-17 Bosch Gmbh Robert Schnellstoppeinrichtung zum stillsetzen einer saegekette einer tragbaren motorkettensaege
EP0440827B1 (de) * 1990-01-31 1994-07-06 Dolmar GmbH Bremseinrichtung an einer motorgetriebenen Handsäge, insbesondere einer Motorkettensäge
US20190030746A1 (en) * 2016-01-30 2019-01-31 Koki Holdings Co., Ltd. Chainsaw

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1976406A (en) * 1932-02-15 1934-10-09 Clyde Iron Works Safety brake
US2480343A (en) * 1943-01-21 1949-08-30 American Car & Foundry Co Safety band brake for high-speed tools
US3228177A (en) * 1964-07-29 1966-01-11 Coates Leroy Safety device for power equipment
US3292742A (en) * 1964-11-03 1966-12-20 Clark Equipment Co Brake
US3485326A (en) * 1967-10-20 1969-12-23 Mcculloch Corp Magnetic stopping device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1976406A (en) * 1932-02-15 1934-10-09 Clyde Iron Works Safety brake
US2480343A (en) * 1943-01-21 1949-08-30 American Car & Foundry Co Safety band brake for high-speed tools
US3228177A (en) * 1964-07-29 1966-01-11 Coates Leroy Safety device for power equipment
US3292742A (en) * 1964-11-03 1966-12-20 Clark Equipment Co Brake
US3485326A (en) * 1967-10-20 1969-12-23 Mcculloch Corp Magnetic stopping device

Cited By (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839795A (en) * 1973-04-26 1974-10-08 Mc Culloch Corp Chain saw safety method and apparatus
US3937306A (en) * 1973-08-29 1976-02-10 Husqvarna Ab Automatic brake actuator for a chain saw
US3991864A (en) * 1973-10-25 1976-11-16 Andreas Stihl Maschinenfabrik Motor saw, especially motor chain saw
US3992779A (en) * 1973-12-21 1976-11-23 Textron, Inc. Chain brake for chain saw
US3961433A (en) * 1974-06-21 1976-06-08 The Raymond Lee Organization Inc. Picture poster viewer
US3923126A (en) * 1974-06-25 1975-12-02 Textron Inc Band type brake for a chain saw
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
US3991469A (en) * 1974-10-15 1976-11-16 Mcculloch Corporation Safety braking mechanism for a portable chain saw
US3934345A (en) * 1974-10-15 1976-01-27 Mcculloch Corporation Snap-acting over-center chain saw safety brake and method of operation thereof
US4059895A (en) * 1974-10-15 1977-11-29 Mcculloch Corporation Full position safety brake for portable chain saw
FR2291697A1 (fr) * 1974-11-22 1976-06-18 Kaaz Machinery Co Ltd Faucheuse-debroussailleuse portative
US4006528A (en) * 1974-11-22 1977-02-08 Kaaz Machinery Co. Ltd. Portable grass and brush cutter with brake and clutch
US4057900A (en) * 1975-06-04 1977-11-15 Ab Partner Power saw
US3974566A (en) * 1975-09-08 1976-08-17 Mcculloch Corporation Method and apparatus for arresting movement of a chain saw cutter chain
US4091896A (en) * 1976-01-22 1978-05-30 Firma Andreas Stihl Chain saw braking mechanism
US4121339A (en) * 1977-08-10 1978-10-24 Milovan Nikolich Safety brake mechanism for chain saws
US4156477A (en) * 1977-09-14 1979-05-29 Kioritz Corporation Braking system of chain saw
US4246701A (en) * 1978-05-18 1981-01-27 Jonsereds Ab Safety braking device for a portable power saw
US4197640A (en) * 1978-09-18 1980-04-15 Beaird-Poulan Division, Emerson Electric Co. Safety braking apparatus for portable chain saw
EP0020457A1 (en) * 1978-09-18 1981-01-07 Beaird-Poulan Division, Emerson Electric Company Safety braking apparatus for portable chain saw
EP0020457A4 (en) * 1978-09-18 1981-02-04 Beaird Poulan Div SAFETY BRAKE DEVICE FOR PORTABLE CHAINSAW.
US4310972A (en) * 1979-12-28 1982-01-19 Trail Manufacturing Limited Brake control assembly
US4334357A (en) * 1980-08-08 1982-06-15 Black & Decker Inc. Safety braking apparatus for a portable chain saw
US4474269A (en) * 1981-06-04 1984-10-02 Andreas Stihl Braking device for a power chain saw
DE3324628A1 (de) * 1983-07-08 1985-01-17 Fa. Andreas Stihl, 7050 Waiblingen Kettenbrems-vorrichtung
US4586588A (en) * 1983-08-01 1986-05-06 Kioritz Corporation Chain saw safety-brake system
US4630372A (en) * 1983-09-07 1986-12-23 Kioritz Corporation Front handle support means of portable chain saw
US4721193A (en) * 1984-10-18 1988-01-26 Kioritz Corporation Emergency braking system of chain saw
AU576035B2 (en) * 1985-01-29 1988-08-11 Kenneth Wallmark Braking device for chain saw
US4651423A (en) * 1986-04-23 1987-03-24 Grogan Victor A Chain saw cutting chain safety stop
US4793064A (en) * 1986-05-02 1988-12-27 Kioritz Corporation Chain saw safety braking device
US6094822A (en) * 1998-02-26 2000-08-01 Andreas Stihl Ag & Co. Hedge clippers
US6814192B2 (en) * 2001-02-07 2004-11-09 Dolmar Gmbh Device for braking a motor shaft
US20060060439A1 (en) * 2004-09-22 2006-03-23 Norio Shirokoshi Brake-equipped retracting mechanism for retractable member
US7293632B2 (en) * 2004-09-22 2007-11-13 Harmonic Ad, Inc. Brake-equipped retracting mechanism for retractable member
US7617809B2 (en) * 2004-11-15 2009-11-17 Dolmar Gmbh Starting brake for a hedge clipper
US20070295298A1 (en) * 2004-11-15 2007-12-27 Dolmar Gmbh Starting Brake for a Hedge Clipper
US20060102437A1 (en) * 2004-11-17 2006-05-18 Masato Nara Brake system of working machine
US20080283650A1 (en) * 2005-06-29 2008-11-20 Norio Shirokoshi Brake-Equipped Retracting Device for Retractable Member
US7686141B2 (en) * 2005-06-29 2010-03-30 Harmonic Ad, Inc. Brake-equipped retracting device for retractable member
US7200941B2 (en) * 2005-07-12 2007-04-10 Myers Kent J Chainsaw throttle and brake mechanisms
US20070011888A1 (en) * 2005-07-12 2007-01-18 Myers Kent J Chainsaw throttle and brake mechanisms
US20150260241A1 (en) * 2012-10-03 2015-09-17 Hilti Aktiengesellschaft Hand-Operated Tool Device With A Brake Mechanism For Braking A Machining Tool
US20150258703A1 (en) * 2012-10-03 2015-09-17 Hilti Aktiengesellschaft Hand-Held Tool Apparatus with a Braking Device for Braking of a Machining Tool
US20150258658A1 (en) * 2012-10-03 2015-09-17 Hilti Aktiengesellschaft Hand-Held Tool Apparatus with a Braking Device for Braking a Machining Tool
CN112352651A (zh) * 2020-11-20 2021-02-12 永康市南征工贸股份有限公司 一种可调节式防意外伤人的电动链锯
CN112352651B (zh) * 2020-11-20 2022-01-07 永康市南征工贸股份有限公司 一种可调节式防意外伤人的电动链锯

Also Published As

Publication number Publication date
DE2217707B2 (de) 1978-08-17
JPS5316157B1 (sv) 1978-05-30
GB1385216A (en) 1975-02-26
DE2217707C3 (de) 1980-08-28
DE2217707A1 (de) 1972-10-19
CA976847A (en) 1975-10-28
SE390131B (sv) 1976-12-06

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