US3664390A - Safety means for power-driven chain saws - Google Patents
Safety means for power-driven chain saws Download PDFInfo
- Publication number
- US3664390A US3664390A US82342A US3664390DA US3664390A US 3664390 A US3664390 A US 3664390A US 82342 A US82342 A US 82342A US 3664390D A US3664390D A US 3664390DA US 3664390 A US3664390 A US 3664390A
- Authority
- US
- United States
- Prior art keywords
- lever arm
- engine
- safety means
- saw
- handle
- 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
Links
Images
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
Definitions
- a safety means comprising switch and brake means adapted to break the ignition current of the engine and stop the saw chain, and actuating means which is situated in a position in front of the handle of the saw and arranged to be operated by the hand of the operator in case of an accident to bring said switch and brake means into operation to stop the engine and the saw chain.
- the object of the present invention is to provide safety means to prevent such accidents.
- the safety means according to the invention comprises a lever arm which is arranged to be swung about a pivot axis and part of which is situated in front of the side of the handle facing the blade and is spaced from the handle, a brake means connected to the lever arm and adapted, when the lever arm is swung about the pivot axis, to be urged against a member driven by the engine, such as a member partaking in the rotation of the drive wheel, to brake said member and thus the saw chain, and actuating means arranged on the lever arm and adapted, when the lever arm is swung towards the blade, to actuate a switch for breaking the ignition current of the engine.
- the power-driven chain saw illustrated in the drawing is a conventional chain saw which can be modified by simple measures for easy incorporation of the safety means therein.
- the chain saw comprises a housing 1 for an internal combustion engine (not shown).
- a drive wheel 4 for a saw chain 5 guided on the blade 6 is coupled to the outgoing shaft 2 of the engine by a clutch 3.
- a U-shaped handle 7 is mounted on the housing 1 and extends across the top of the housing.
- a lever arm 8 is mounted on the housing for pivotment about journals 9 so placed on the engine housing that the pivot axis of the lever arm 8 will be situated rearwardly of the handle 7.
- the lever arm 8 includes a part 17 which is obliquely forwardly directed from the pivot axis 9 and extends forwardly past the handle 7, and a part 18 which is bent at an angle obliquely upwardly away from said part 17 and is substantially parallel to the corresponding lateral limb of the handle 7.
- the outer end of the obliquely upwardly bent part 18 is thus situated on the front side of the handle 7, Le, forwardly of the side of the handle facing the blade 6.
- a rod is pivoted to the lever arm 8 and slidably guided in a guide in the engine housing, for example a bore formed in said engine housing and opening into an annular space between the engine housing and the periphery of the clutch housing 3.
- a brake shoe 11 which is connected to the rod 10 and provided with a brake lining on the side facing the circumferential surface of the clutch housing 3.
- the lever arm 8 is normally kept in a position of rest with the brake shoe 11 at some distance from the periphery of the clutch housing 3 by a return spring 12 which is a coil spring wound about the rod 10 and interposed between the engine housing 1 and the lever arm 8.
- the lever arm 8 has a projection 13, for example at the angular bend between its two straight portions, to cooperate with a switch 14 located on the engine housing.
- the switch 14 is arranged and disposed in such a manner that by actuation of the switch the pro ection 13 breaks the ignitlon current of the engine when the lever arm 8 is swung forwardly and before the brake shoe 11 comes into braking engagement with the periphery of the clutch housing 3.
- the lever arm 8 carries a rod 15 which extends across the engine housing and is spaced such a distance from the handle 7 that should the saw operator's hand slip or move forward in any other unintentional manner towards the lever arm 8 and the rod 15 or should the saw as a result of a throw turn counterclockwise about the handle 7, the rod 15 actuated by the operators hand will be swung towards the blade, whereby the above described safety means comprising the switch 14 and the brake means 10, 11 is made operative so that the ignition current of the engine is broken and in immediate conjunction therewith the brake is applied for braking the living force of the engine, transmission and chain so that the chain is rapidly stopped.
- the lever arm 8 may be in the form of a Ushaped member which surrounds the upper part of the engine housing as does the U-shaped handle.
- the lever arm is composed of two parts which are detachably connected together at 16.
- the brake rod 10 having the brake shoe 11 is secured to one part 17 of the lever arm as is the actuating means 13 for the switch 14.
- the other part 18 of the lever arm carries the transverse rod 15.
- the upper part 18 of the lever arm can be swung at the hinge connection 16 towards the handle 7 so that the saw operator can move his hand freely.
- safety means comprising a lever arm which is arranged to be swung about a pivot axis and part of which is situated in front of the side of the handle facing the blade and is spaced from said handle, a brake means connected to the lever arm and adapted, when the lever arm is swung about the pivot axis, to be urged against a member driven by the engine, and actuating means arranged on the lever arm and adapted, when the lever arm is swung towards the sword, to actuate a switch for breaking the ignition current of the engine.
- Safety means as defined in claim 1, wherein the pivot axis of the lever arm is disposed on the engine housing rearwardly of the handle.
- lever arm is composed of two parts so as to include a first part carrying said brake means and said actuating means for the switch, and a second part which is hinged to the first part and has a rod extending across the engine housing, and said second part can be swung about the hinge connection to a position in which the rod is not in the way of the saw operators hand.
- Safety means as defined in claims 1 and 2, wherein the brake shoe is connected to a rod which is slidable in a guide connected to the engine housing and pivoted to the lever arm.
- Safety means as defined in claims 1, 3 and 5, wherein a return spring is interposed between the lever arm and the engine housing to return the lever arm and the brake means to inoperative position.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE14771/69A SE348964B (fi) | 1969-10-29 | 1969-10-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3664390A true US3664390A (en) | 1972-05-23 |
Family
ID=20299633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US82342A Expired - Lifetime US3664390A (en) | 1969-10-29 | 1970-10-20 | Safety means for power-driven chain saws |
Country Status (11)
Country | Link |
---|---|
US (1) | US3664390A (fi) |
AT (1) | AT305599B (fi) |
CA (1) | CA925001A (fi) |
CH (1) | CH518783A (fi) |
DE (1) | DE2051664A1 (fi) |
ES (1) | ES384879A1 (fi) |
FI (1) | FI54070C (fi) |
FR (1) | FR2066575A5 (fi) |
GB (1) | GB1280805A (fi) |
NO (1) | NO133964C (fi) |
SE (1) | SE348964B (fi) |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3739475A (en) * | 1971-10-19 | 1973-06-19 | Mc Culloch Corp | Chain saw safety method and apparatus |
US3793727A (en) * | 1972-10-04 | 1974-02-26 | Mcculloch Corp | Chain saw safety method and apparatus |
US3839795A (en) * | 1973-04-26 | 1974-10-08 | Mc Culloch Corp | Chain saw safety method and apparatus |
DE2440483A1 (de) * | 1973-08-29 | 1975-03-13 | Husqvarna Ab | Motorsaege |
JPS5140699A (en) * | 1974-10-03 | 1976-04-05 | Kyoritsu Kk | Chensoono hanpatsuanzensoochi |
US3974566A (en) * | 1975-09-08 | 1976-08-17 | Mcculloch Corporation | Method and apparatus for arresting movement of a chain saw cutter chain |
US4152833A (en) * | 1977-06-22 | 1979-05-08 | Crow, Lytle, Gilwee, Donoghue, Adler And Weineger | Chain saw braking mechanism |
WO1982000437A1 (en) * | 1980-08-08 | 1982-02-18 | Overy C | Switch-brake interlock for chain saw |
US4335514A (en) * | 1980-08-08 | 1982-06-22 | Black & Decker Inc. | Switch-brake interlock for chain saw |
US4385442A (en) * | 1980-02-08 | 1983-05-31 | Andreas Stihl | Portable power chain saw |
US4419857A (en) * | 1981-08-07 | 1983-12-13 | Outboard Marine Corporation | Lawn mower with combined engine brake and ignition control |
US4432139A (en) * | 1980-10-28 | 1984-02-21 | Andreas Stihl | Safety device on a power saw |
WO1984003650A1 (en) * | 1983-03-14 | 1984-09-27 | Victor A Grogan | A chain saw safety switch |
US4573556A (en) * | 1983-05-20 | 1986-03-04 | Aktiebolaget Electrolux | Actuator for the release of an automatic emergency brake of a hand-operated powered tool |
US4651423A (en) * | 1986-04-23 | 1987-03-24 | Grogan Victor A | Chain saw cutting chain safety stop |
AU576035B2 (en) * | 1985-01-29 | 1988-08-11 | Kenneth Wallmark | Braking device for chain saw |
US5101567A (en) * | 1991-06-27 | 1992-04-07 | Cool James E | Chain saw electric all-stop safety switch |
US5150523A (en) * | 1991-07-11 | 1992-09-29 | Ryobi Motor Products Corporation | Deadman switch arrangement for a hedge trimmer |
US5305528A (en) * | 1992-04-17 | 1994-04-26 | Textron Inc. | Power tool braking system |
US5791057A (en) * | 1995-09-04 | 1998-08-11 | Makita Corporation | Electromotive chain saw |
US20100147544A1 (en) * | 2008-11-20 | 2010-06-17 | Yamabiko Corporation | Work Apparatus With Internal Combustion Engine |
US8601919B1 (en) | 2000-11-06 | 2013-12-10 | William C. King | Method of braking a chain saw |
EP2813702A3 (de) * | 2013-06-13 | 2014-12-24 | Andreas Stihl AG & Co. KG | Arbeitsgerät mit einem Verbrennungsmotor |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3608523A1 (de) * | 1986-03-14 | 1987-09-17 | Bosch Gmbh Robert | Schnellstoppeinrichtung zum stillsetzen einer saegekette einer tragbaren motorkettensaege |
DE3640162A1 (de) * | 1986-11-25 | 1988-05-26 | Franz Rebhan | Gehaeuse fuer eine motorkettensaege |
DE3821874A1 (de) * | 1988-06-29 | 1990-01-18 | Black & Decker Inc | Kettensaege |
DE3932137C2 (de) * | 1989-09-27 | 1998-07-02 | Stihl Maschf Andreas | Vorrichtung zur Betätigung einer Bremsvorrichtung zum Stillsetzen eines motorgetriebenen Arbeitswerkzeuges eines Arbeitsgerätes |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1189603A (en) * | 1915-04-21 | 1916-07-04 | Charles E Michener | Saw. |
US1617565A (en) * | 1921-04-23 | 1927-02-15 | Chain Saw Corp | Tree-sawing apparatus |
US3292673A (en) * | 1963-08-27 | 1966-12-20 | Rockwell Mfg Co | Power operated portable hand saw |
-
1969
- 1969-10-29 SE SE14771/69A patent/SE348964B/xx unknown
-
1970
- 1970-10-20 US US82342A patent/US3664390A/en not_active Expired - Lifetime
- 1970-10-21 DE DE19702051664 patent/DE2051664A1/de active Granted
- 1970-10-22 AT AT953170A patent/AT305599B/de not_active IP Right Cessation
- 1970-10-24 ES ES384879A patent/ES384879A1/es not_active Expired
- 1970-10-27 FR FR7038667A patent/FR2066575A5/fr not_active Expired
- 1970-10-28 CA CA096834A patent/CA925001A/en not_active Expired
- 1970-10-28 NO NO4089/70A patent/NO133964C/no unknown
- 1970-10-28 GB GB51320/70A patent/GB1280805A/en not_active Expired
- 1970-10-28 FI FI2902/70A patent/FI54070C/fi active
- 1970-10-28 CH CH1590870A patent/CH518783A/de not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1189603A (en) * | 1915-04-21 | 1916-07-04 | Charles E Michener | Saw. |
US1617565A (en) * | 1921-04-23 | 1927-02-15 | Chain Saw Corp | Tree-sawing apparatus |
US3292673A (en) * | 1963-08-27 | 1966-12-20 | Rockwell Mfg Co | Power operated portable hand saw |
Cited By (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3739475A (en) * | 1971-10-19 | 1973-06-19 | Mc Culloch Corp | Chain saw safety method and apparatus |
US3793727A (en) * | 1972-10-04 | 1974-02-26 | Mcculloch Corp | Chain saw safety method and apparatus |
US3839795A (en) * | 1973-04-26 | 1974-10-08 | Mc Culloch Corp | Chain saw safety method and apparatus |
DE2440483A1 (de) * | 1973-08-29 | 1975-03-13 | Husqvarna Ab | Motorsaege |
JPS5140699A (en) * | 1974-10-03 | 1976-04-05 | Kyoritsu Kk | Chensoono hanpatsuanzensoochi |
US3974566A (en) * | 1975-09-08 | 1976-08-17 | Mcculloch Corporation | Method and apparatus for arresting movement of a chain saw cutter chain |
US4152833A (en) * | 1977-06-22 | 1979-05-08 | Crow, Lytle, Gilwee, Donoghue, Adler And Weineger | Chain saw braking mechanism |
US4385442A (en) * | 1980-02-08 | 1983-05-31 | Andreas Stihl | Portable power chain saw |
WO1982000437A1 (en) * | 1980-08-08 | 1982-02-18 | Overy C | Switch-brake interlock for chain saw |
US4335514A (en) * | 1980-08-08 | 1982-06-22 | Black & Decker Inc. | Switch-brake interlock for chain saw |
US4432139A (en) * | 1980-10-28 | 1984-02-21 | Andreas Stihl | Safety device on a power saw |
US4419857A (en) * | 1981-08-07 | 1983-12-13 | Outboard Marine Corporation | Lawn mower with combined engine brake and ignition control |
WO1984003650A1 (en) * | 1983-03-14 | 1984-09-27 | Victor A Grogan | A chain saw safety switch |
US4573556A (en) * | 1983-05-20 | 1986-03-04 | Aktiebolaget Electrolux | Actuator for the release of an automatic emergency brake of a hand-operated powered tool |
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 |
US5101567A (en) * | 1991-06-27 | 1992-04-07 | Cool James E | Chain saw electric all-stop safety switch |
US5150523A (en) * | 1991-07-11 | 1992-09-29 | Ryobi Motor Products Corporation | Deadman switch arrangement for a hedge trimmer |
US5305528A (en) * | 1992-04-17 | 1994-04-26 | Textron Inc. | Power tool braking system |
US5791057A (en) * | 1995-09-04 | 1998-08-11 | Makita Corporation | Electromotive chain saw |
USRE37832E1 (en) | 1995-09-04 | 2002-09-10 | Makita Corporation | Electromotive chain saw |
US8601919B1 (en) | 2000-11-06 | 2013-12-10 | William C. King | Method of braking a chain saw |
US20100147544A1 (en) * | 2008-11-20 | 2010-06-17 | Yamabiko Corporation | Work Apparatus With Internal Combustion Engine |
US8469001B2 (en) * | 2008-11-20 | 2013-06-25 | Yamabiko Corporation | Work apparatus with internal combustion engine |
EP2813702A3 (de) * | 2013-06-13 | 2014-12-24 | Andreas Stihl AG & Co. KG | Arbeitsgerät mit einem Verbrennungsmotor |
CN104227791A (zh) * | 2013-06-13 | 2014-12-24 | 安德烈·斯蒂尔股份两合公司 | 带有内燃机的工作器械 |
US9353721B2 (en) | 2013-06-13 | 2016-05-31 | Andreas Stihl Ag & Co. Kg | Work implement with an internal combustion engine |
RU2655823C2 (ru) * | 2013-06-13 | 2018-05-29 | Андреас Штиль АГ унд Ко. КГ | Рабочий инструмент с двигателем внутреннего сгорания |
Also Published As
Publication number | Publication date |
---|---|
NO133964B (fi) | 1976-04-20 |
AT305599B (de) | 1973-03-12 |
CA925001A (en) | 1973-04-24 |
DE2051664A1 (de) | 1971-05-06 |
ES384879A1 (es) | 1973-03-16 |
SE348964B (fi) | 1972-09-18 |
FR2066575A5 (fi) | 1971-08-06 |
FI54070C (fi) | 1978-10-10 |
NO133964C (fi) | 1976-08-04 |
GB1280805A (en) | 1972-07-05 |
CH518783A (de) | 1972-02-15 |
FI54070B (fi) | 1978-06-30 |
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