GB2197945A - Clearing saw having frame tube - Google Patents

Clearing saw having frame tube Download PDF

Info

Publication number
GB2197945A
GB2197945A GB8721531A GB8721531A GB2197945A GB 2197945 A GB2197945 A GB 2197945A GB 8721531 A GB8721531 A GB 8721531A GB 8721531 A GB8721531 A GB 8721531A GB 2197945 A GB2197945 A GB 2197945A
Authority
GB
United Kingdom
Prior art keywords
frame tube
engine
arrangement according
bearings
tool
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.)
Granted
Application number
GB8721531A
Other versions
GB8721531D0 (en
GB2197945B (en
Inventor
Bjorn Fredrik Lundin
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.)
Electrolux AB
Original Assignee
Electrolux AB
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 Electrolux AB filed Critical Electrolux AB
Publication of GB8721531D0 publication Critical patent/GB8721531D0/en
Publication of GB2197945A publication Critical patent/GB2197945A/en
Application granted granted Critical
Publication of GB2197945B publication Critical patent/GB2197945B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B27B9/00—Portable power-driven circular saws for manual operation
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/835—Mowers; Mowing apparatus of harvesters specially adapted for particular purposes
    • A01D34/90—Mowers; Mowing apparatus of harvesters specially adapted for particular purposes for carrying by the operator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
    • B23D47/12—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts of drives for circular saw blades
    • B23D47/126—Angle drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/001—Gas flow channels or gas chambers being at least partly formed in the structural parts of the engine or machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1861—Construction facilitating manufacture, assembly, or disassembly the assembly using parts formed by casting or moulding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/06—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for hand-held tools or portables devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Exhaust Silencers (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

219795 Arrangement in en engine powered machine, e.g. a claering saw,
provided with a frame tube The present invention relates to an arrangement in an engine powered machine having a so-called frame tube - e.g. a clearing saw - where one end of the frame tube is connected with the combustion engine while the other end has a tool, and where the frame tube includes a drive shaft transmitting the drive power from the engine to the tool.
Such machines are previously known and used, for instance, when clearing away bushes and other vegitation in the wood. The machine is then applied on a harness carried by the operator in such a way that the combustion engine is abreast of the waist whereas the frame tube is extended downwards ahead towards the ground. Furthermore, the machine is equipped with a handle applied to the upper part of the frame tube and is operated by means of that handle. The exhaust fumes from the combustion engine pass through an exhaust pipe on the engine with the result that the fumes are let out close to the breathing organe of the operator which, of course, is very unsatisfactory as far as the working environment is concerned. Moreover, the proximity between the noise source and the ears of the operator means that the ears are exposed to an intensive noise.
The present invention aims at a creating of an improved working environment to the operator which is reached by an arrangement having the characteristics according to claim 1.
An embodiment of the invention will now be described with reference to the accompanying drawings where Fig. 1 constitutes a perspective view of a machine on which the present invention is intended to be applied and Fig. 2 constitutes a longitudinal section through part of the machine according to Fig. 1.
As evident from Fig. 1 the machine consists of a combustion engine 10 being fixed at the upper part of a frame tube 11 which also has a handle 12 by which the arrangement can be operated. The lower part of the frame tube carries a tool 13 which here consists of a saw blade whose connection and disconnection as well as its speed of rotation is controlled by operating devices positioned on the handle but not especially illustrated. The machine is during operation carried by a harness which is not either illustrate,'.
The frame tube contains a drive shaft 14 transmitting the drive power from engine 10 to the tool 13 via an angle gear 15. Then the shaft is journalled in several bearings 16, 17, 18 of the frame tube. The bearings 16 and 18 consists of conventicinall slide bearings which also serve as tightening between the interior of the frame tube and the engine 10, and the angle gear 15 respectively, while more intermediate bearings 17 have a number of vents 19 connecting two or more chambers 20 and 21, formed in the frame tube, with each other.
The upper part of the frame tube has an inlet opening 22 to which an exhaust pipe 23, from the engine is connected by means of a fastening sleeve 24. The lower part of the frame tube has a number of outlet openings 25 connecting the chamber 20 with the atmosphere.
The arrangement operates as follows:
The exhaust fumes from the combustion engine 10 are conducted through the exhaust tube 23 and the opening 22 into the chamber 21 in the upper part of the frame tube. The exhaust fumes then stream downwards in the frame tube and pass via the vents 19 of the bearing 17 into the chamber 20 from which they continue to the atmosphere through the outlet openings 25.
By choosing a suitable size of the outlet openings 25, a suitable number of intermediate bearings 17, a suitable distance between the bearings 17, 18, 19 and a suitable size of the vents 19 of the bearing 17, the clearing saw can be so designed that the best possible noise reduction and the lowest possible back pressure will be obtained.

Claims (6)

C 1 a i m s
1. Arrangement in an engine powered machine with a so-called frame tube e.g. a clearing saw - where one end of the frame tube (11) is connected to the combustion engine (10) while the other end has a tool (13) and where the frame tube (11) includes a drive shaft (14) transmitting the drive power from the engine to the tool, c h a r a c t e r 1 z e d in that the frame tube (11) is provided with one or more inlet and outlet openings, respectively (22 and 25) for the exhaust fumes from the combustion engine.
2. Arrangement according to claim 2, c h a r a c t e r i z e d in that the frame tube has an inlet opening (22) for exhaust fumes and several outlet openings (25).
3. Arrangement according to one of the claims 1 or 2, c h a r a c t e r 1 z e d in that the outlet openings (25) are situated close to that part of the frame tube which carries the tool (13).
4. Arrangement according to one of the previous claims, c h a r a c t e r 1 z e d in that the drive shaft is carried by bearings (16,17,18) in the frame tube where at least one of the bearings has one or more openings (19) through which the exhaust fumes are conducted along the drive shaft.
5. Arrangement according to claim 4, c h a r a c t e r 1 z c d in that the bearings (16,17,18) constitute slide bearings shaped as sleeves.
6. Arrangement according to one of the previous claims, c h a r a c t e r 1 z e d in that the frame tube (11) close to its ends is provided with a bearing group (16,18) which simultaneously constitutes a tightening towards the engine part and the tool part, respectively.
GB8721531A 1986-09-19 1987-09-14 Arrangement of a combustion engine on a device,e.g. a clearing saw, provided with a frame tube Expired - Fee Related GB2197945B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8603955A SE462326B (en) 1986-09-19 1986-09-19 DEVICE FOR A RIGGROER STORED, COMBUSTION ENGINE DRIVING EQUIPMENT EXAMPLE A CUTTING SAW.

Publications (3)

Publication Number Publication Date
GB8721531D0 GB8721531D0 (en) 1987-10-21
GB2197945A true GB2197945A (en) 1988-06-02
GB2197945B GB2197945B (en) 1991-01-16

Family

ID=20365653

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8721531A Expired - Fee Related GB2197945B (en) 1986-09-19 1987-09-14 Arrangement of a combustion engine on a device,e.g. a clearing saw, provided with a frame tube

Country Status (4)

Country Link
DE (1) DE3731326A1 (en)
FI (1) FI82897C (en)
GB (1) GB2197945B (en)
SE (1) SE462326B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2364352A (en) * 2000-07-03 2002-01-23 Draftex Ind Ltd Noise reduction in air conduits; making perforated conduits

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5774993A (en) * 1994-10-29 1998-07-07 Andreas Stihl Hand-held working tool, especially trimmer or edge cutter
DE19528358C2 (en) * 1995-08-02 1999-09-30 Stihl Maschf Andreas Brush cutter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE912031C (en) * 1951-11-24 1954-05-24 Ernst Wieland Motorized mower

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2364352A (en) * 2000-07-03 2002-01-23 Draftex Ind Ltd Noise reduction in air conduits; making perforated conduits

Also Published As

Publication number Publication date
FI82897C (en) 1991-05-10
FI874088A0 (en) 1987-09-18
DE3731326C2 (en) 1989-08-24
FI874088A (en) 1988-03-20
GB8721531D0 (en) 1987-10-21
SE8603955D0 (en) 1986-09-19
SE462326B (en) 1990-06-11
GB2197945B (en) 1991-01-16
SE8603955L (en) 1988-03-20
FI82897B (en) 1991-01-31
DE3731326A1 (en) 1988-03-24

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940914