US3566848A - Portable power-driven chain saws - Google Patents

Portable power-driven chain saws Download PDF

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Publication number
US3566848A
US3566848A US741189A US3566848DA US3566848A US 3566848 A US3566848 A US 3566848A US 741189 A US741189 A US 741189A US 3566848D A US3566848D A US 3566848DA US 3566848 A US3566848 A US 3566848A
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US
United States
Prior art keywords
cover
fan
front wall
impeller
engine
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
US741189A
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English (en)
Inventor
Gunther H W Dobbertin
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3566848A publication Critical patent/US3566848A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present portable engine-driven chain saw has a casing for the engine with a side air inlet opening facing a fan-impeller attached to the engine drive shaft for cooling the engine, a cover for said casing opening having a front wall with air inlet openings and sidewalls spacing said cover front wall from said fan-impeller providing an area in which is positioned a perforated strainer plate attached to said drive shaft between said front wall and said fan-impeller for catching impurities such as sawdust, wood chips, pieces of bark or snow coming in with the air and throwing such impurities by centrifugal force through openings in said cover sidewalls away from the operators face.
  • the present invention relates to portable power-driven chain saws of the kind wherein the engine housing is provided with a casing which comprises, at one of those'sides which are substantially parallel with the plane of the saw chain guide bar, a cover for a fan attached to the engine shaft, said cover being provided with air supply openings.
  • Previously known chain saws of this type have the drawback that particles which are sucked by the fan intothe space between the fan and the fan, ccvermay accumulate in said fan and the cover will often be filledwith snow.
  • the object of the present invention is to overcome the above-mentioned drawbacks.
  • said cover .connects, at that .edge .thereof which is directed downwardly in-the position of use of the saw, to a portion directed towards the, engine housing, said portion being provided with outlet openings for, impurities entering the space between the cover and the fan.
  • F IG. -l is a partly broken side view of a power-driven chain saw
  • FIG. 2 is a partly broken view to a'larger scale from below of the fan cover'of the saw shown in FIG. 1;
  • FlG. 3' is a cross section taken on the line lll-lll in HQ 1;
  • FIG. 4 is a longitudinal section taken on the line lV-lV in FIG. 1.
  • numeral 1 indicates the engine housing of I the saw together with its casing;
  • the engine housing is provided with a handle 2 and a carrying yoke 3.
  • Numeral 4 indicates the guide bar for the saw chain.
  • the casing of the engine housing 1 includes a cover 5 which is mounted on one end of the engine shaft.
  • the cover 5 is provided with a number of slot-shaped air supply openings 6 and 7.
  • the cover 5 which is elongated in the longitudinal direction of the guide bar has a channel-shaped cross section, the openings 6 and 7 being provided in that portion of the cover which forms the bottom of the channel section, whereas that sidewall of the cover which is directed upthe like may be thrown upby the fan intothe face of the operator. At that edge of the cover.
  • The-cover connects to a portion 9 which is directed towards the engine housing, said portion 9 forming the second sidewall of the channel-shaped cross section.
  • the wall 9 is provided with openings 10 and 11 through which particles entering the space between the cover 5 and the fan may fall out.
  • a transverse wall 12 which extends from the upper wall 8 to the lower wall 9 and which serves for catching particles of dirt and the like and guiding the same'down towards the openings 10 and 11 in the wall 9.
  • the wall 9 wherein the outlet openings 10 and 11 are provided need not constitute an integral part of the cover 5 but .may be made in one piece with the-adjacentportion of the engine housing.
  • the impeller 13 of the fan is attached to the engine shaft 14 and is provided at the intake side with a shallow cup-shaped perforated strainer plate 15 rotating together with the impeller.
  • a starting device 16 of the type which is operated manually by means of a wire.
  • cover 5 avoids the drawback of the previously known power-driven chain saws that dirt particles and said fan-impeller, and including a cover for said casing air inlet opening having a front wall opposite said fan-impeller and sidewalls connected to said casing and attached to said front wall, forming a space between saidfront wall and said fan-impeller, said cover front wall having air inlet openings, a perforated strainer plate attached to said drive shaft between said fan-impeller and said front wall and arranged to catch impurities in the air coming from said cover front wall inlet openings and conduct such impurities laterally of saidstrainer plate by centrifugal force and said cover sidewalls have openings positioned therein for the passage of such discharged impurities away from the face of an operator of said saw.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US741189A 1967-06-30 1968-06-28 Portable power-driven chain saws Expired - Lifetime US3566848A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE09898/67*A SE328393B (it) 1967-06-30 1967-06-30

Publications (1)

Publication Number Publication Date
US3566848A true US3566848A (en) 1971-03-02

Family

ID=20277758

Family Applications (1)

Application Number Title Priority Date Filing Date
US741189A Expired - Lifetime US3566848A (en) 1967-06-30 1968-06-28 Portable power-driven chain saws

Country Status (3)

Country Link
US (1) US3566848A (it)
DE (1) DE1703692A1 (it)
SE (1) SE328393B (it)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3432146A1 (de) * 1983-09-06 1985-03-21 Kioritz Corp., Mitaka, Tokio/Tokyo Kuehlgeblaese fuer brennkraftmaschinen mit zugseilstarter
US4838908A (en) * 1988-07-27 1989-06-13 Kohler Co. Engine air intake screen assembly
US4841920A (en) * 1986-03-14 1989-06-27 Aktiebolaget Electrolux Arrangement in an air-cooled I. C. engine
US4962617A (en) * 1989-05-20 1990-10-16 Andreas Stihl Portable handheld power-driven tool
US20110072671A1 (en) * 2008-05-23 2011-03-31 Hitachi Koki Co., Ltd., Chain saw

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10341462B4 (de) * 2003-09-09 2012-11-29 Andreas Stihl Ag & Co. Kg Starteinrichtung für einen Verbrennungsmotor
DE102004031042B4 (de) * 2004-06-25 2015-08-20 Andreas Stihl Ag & Co. Kg Arbeitsgerät

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747558A (en) * 1952-10-18 1956-05-29 Elmer C Kiekhaefer Air-cooled engine and air intake therefor
US3157211A (en) * 1959-06-26 1964-11-17 Wiig Rasmus Kristian Austraat Internal combustion engine-driven hand saw
US3252449A (en) * 1964-07-31 1966-05-24 Briggs & Stratton Corp Screen unit for air cooled internal combustion engines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747558A (en) * 1952-10-18 1956-05-29 Elmer C Kiekhaefer Air-cooled engine and air intake therefor
US3157211A (en) * 1959-06-26 1964-11-17 Wiig Rasmus Kristian Austraat Internal combustion engine-driven hand saw
US3252449A (en) * 1964-07-31 1966-05-24 Briggs & Stratton Corp Screen unit for air cooled internal combustion engines

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3432146A1 (de) * 1983-09-06 1985-03-21 Kioritz Corp., Mitaka, Tokio/Tokyo Kuehlgeblaese fuer brennkraftmaschinen mit zugseilstarter
US4543915A (en) * 1983-09-06 1985-10-01 Kioritz Corporation Cooling fan for recoil starter type engine
US4841920A (en) * 1986-03-14 1989-06-27 Aktiebolaget Electrolux Arrangement in an air-cooled I. C. engine
US4838908A (en) * 1988-07-27 1989-06-13 Kohler Co. Engine air intake screen assembly
US4962617A (en) * 1989-05-20 1990-10-16 Andreas Stihl Portable handheld power-driven tool
US20110072671A1 (en) * 2008-05-23 2011-03-31 Hitachi Koki Co., Ltd., Chain saw
US8935856B2 (en) * 2008-05-23 2015-01-20 Hitachi Koki Co., Ltd. Chain saw

Also Published As

Publication number Publication date
SE328393B (it) 1970-09-14
DE1703692A1 (de) 1971-12-30

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