SE467454B - Protective device pertaining to saw bars - Google Patents

Protective device pertaining to saw bars

Info

Publication number
SE467454B
SE467454B SE9102157A SE9102157A SE467454B SE 467454 B SE467454 B SE 467454B SE 9102157 A SE9102157 A SE 9102157A SE 9102157 A SE9102157 A SE 9102157A SE 467454 B SE467454 B SE 467454B
Authority
SE
Sweden
Prior art keywords
saw
protective device
pin
recess
oil chamber
Prior art date
Application number
SE9102157A
Other languages
Swedish (sv)
Other versions
SE9102157D0 (en
SE9102157L (en
Inventor
S Lindberg
Original Assignee
Sandvik 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 Sandvik Ab filed Critical Sandvik Ab
Priority to SE9102157A priority Critical patent/SE9102157L/en
Publication of SE9102157D0 publication Critical patent/SE9102157D0/en
Publication of SE467454B publication Critical patent/SE467454B/en
Publication of SE9102157L publication Critical patent/SE9102157L/en

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
    • B27B17/02—Chain saws equipped with guide bar
    • 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
    • B27B17/14—Arrangements for stretching the chain saw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/003—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for chain saws

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)

Abstract

Protective device pertaining to such saw bars for chain saws which are slidably movable under the influence of a hydraulic piston 15 in relation to a mounting plate 11 joined to the motor unit, comprising a pin 18 which juts from an oil chamber 23, which is pressurized whenever the chain saw is in operation, into a recess 19 in the saw bar or an intermediate piece joined to the saw bar. <IMAGE>

Description

O\ -a lO 15 20 '25 30 35 2 motorenhetens drivhjul koncentriskt hål (14). I ett urtag i fästplattan (11) är glidbart anordnat ett mellanstycke (12), vid vilket sågsvärdet är permanent eller lösbart fästat. O \ -a lO 15 20 '25 30 35 2 motor unit drive wheel concentric hole (14). A spacer (12) is slidably arranged in a recess in the mounting plate (11), to which the saw blade is permanently or releasably attached.

Under drift är mellanstycket (12) framátskjutet under påverkan av en eller flera hydrauliska kolvar (15) vars tryck alstras av en i fästplattan innesluten fjäder (13), som kan vara en gasfjäder eller en mekanisk fjäder.During operation, the intermediate piece (12) is pushed forward under the action of one or more hydraulic pistons (15) whose pressure is generated by a spring (13) enclosed in the mounting plate, which may be a gas spring or a mechanical spring.

Vid byte av sàgkedja eller sàgsvärd manövreras fästet med en ventil (16) som med ett handtag (17) kan ställas i tre olika lägen: ett öppet då olja kan strömma i bägge riktningarna mellan hydraulkolvens oljerum (22) och fjädern (13), ett envägs läge då olja kan strömma från fjädern (13) till oljerummet (22) men inte i motsatt riktning, och ett stängt läge då olja varken strömmar till eller från fjädern (13).When changing the saw chain or saw blade, the bracket is operated with a valve (16) which with a handle (17) can be set in three different positions: an open one where oil can flow in both directions between the oil piston oil chamber (22) and the spring (13), a a one-way position where oil can flow from the spring (13) to the oil chamber (22) but not in the opposite direction, and a closed position when oil does not flow to or from the spring (13).

Enligt uppfinningen finns i mellanstyckets (12) styryta ett avlångt urtag (19), som inåt avslutas med en brant vägg (21) och utåt med en sluttande ramp (20). I fästplattan finns ett oljerum (23) med ett ur fästplattan utskjutande stift (18).According to the invention, there is an elongate recess (19) in the guide surface of the intermediate piece (12), which ends inwards with a steep wall (21) and outwards with a sloping ramp (20). In the mounting plate there is an oil chamber (23) with a pin (18) projecting from the mounting plate.

Stiftets oljerum (23) är genom inre kanaler förbundet med hydraulkolvens oljerum (22).The oil chamber (23) of the pin is connected by internal channels to the oil chamber (22) of the hydraulic piston.

Under drift står ventilen (16) i envägsläget och såväl stiftets oljerum (23) som hydraulkolvens oljerum (22) står under tryck. Om sàgkedjan skulle brista under drift skjuter hydraulkolven (15) mellanstycket (12) utåt endast så långt att stiftet (18) slår emot urtagets (19) branta vägg (21).During operation, the valve (16) is in the one-way position and both the oil chamber (23) of the pin and the oil chamber (22) of the hydraulic piston are under pressure. Should the saw chain break during operation, the hydraulic piston (15) pushes the intermediate piece (12) outwards only so far that the pin (18) strikes the steep wall (21) of the recess (19).

Som förberedelse till byte av sàgkedja stannar man drivmotorn, ställer ventilen (16) i öppet läge och pressar med en hävstâng mellanstycket (12) inåt. Både hydraulkolvens och stiftets oljerum (22,23) står då fortfarande under tryck, men olja strömmar över till fjädern (13). När mellanstycket (12) närmar sig full intryckning lyfts stiftet (18) av rampen (20) vid urtaget. Ventilen (16) skall därefter ställas om till stängt läge, varvid trycket bortfaller i de två oljerummen (22,23). Sågkedjan kan nu 10 15 20 25 467 454 3 tas loss, och om så önskas kan mellanstycket (12) avlägsnas från fästplattan (11) utan att hindras av stiftet (18).In preparation for changing the saw chain, stop the drive motor, place the valve (16) in the open position and press the lever (12) inwards with a lever. Both the oil chamber of the hydraulic piston and the pin (22,23) are then still under pressure, but oil flows over to the spring (13). When the intermediate piece (12) approaches full indentation, the pin (18) is lifted off the ramp (20) at the recess. The valve (16) must then be switched to the closed position, whereby the pressure drops in the two oil chambers (22,23). The saw chain can now be detached, and if desired, the spacer (12) can be removed from the mounting plate (11) without being obstructed by the pin (18).

Skulle man glömma att ställa om ventilen (16) kan inte mellanstycket (12) avlägsnas, eftersom stiftet (18) då åter skjuter ut mot urtaget (19) så snart mellanstycket (12) rört sig ett stycke motsvarande rampens (20) längd.Should you forget to adjust the valve (16), the adapter (12) cannot be removed, as the pin (18) then protrudes again towards the recess (19) as soon as the adapter (12) moves a distance corresponding to the length of the ramp (20).

Mellanstycket (12) sättes tillbaka och ny sàgkedja monteras med ventilen (16) i stängt läge. Därefter ställs ventilen (16) i envägs läge varvid de två oljerummen (22,23) åter sätte under tryck. Mellanstycket (12) skjuter då ut tills kedjan är sträckt, och kedjesàgen är klar för drift: Uppfinningen skyddar inte bara mot kedjebrott och felmanövrer, utan även mot alltför starkt slitage av ságkedjan. Vid en starkt sliten sàgkedja ökar delningen genom glapp mellan nitar och länkar och sàgkedjan förlänges.The adapter (12) is replaced and a new saw chain is mounted with the valve (16) in the closed position. Then the valve (16) is set to the one-way position, the two oil chambers (22, 23) being pressurized again. The adapter (12) then protrudes until the chain is stretched, and the chain saw is ready for operation: The invention protects not only against chain breakage and incorrect maneuvers, but also against excessive wear of the saw chain. With a severely worn saw chain, the division increases through play between rivets and links and the saw chain is extended.

Om den blir så starkt sliten att mellanstycket när det läge då stiftet (18) berör den branta väggen (21) i urtaget (19) minskar kedjespänningen, och risken för skador pá drivhjul och noshjul genom den felaktiga delningen elimineras.If it becomes so badly worn that the adapter reaches the position when the pin (18) touches the steep wall (21) in the recess (19), the chain tension decreases, and the risk of damage to the drive wheels and nose wheels due to the incorrect pitch is eliminated.

Uppfinningen kan även appliceras på sådana fästen för ságsvärd, där en hydraulkolv påverkar sågsvärdet direkt utan att detta är monterat på ett mellanstycke. I sådana fall skall urtaget (19) göras i ságsvärdet, och om sàgsvärdet är vändbart fordras tvâ symmetriskt belägna urtag.The invention can also be applied to such brackets for saw blades, where a hydraulic piston affects the saw blade directly without this being mounted on an intermediate piece. In such cases the recess (19) must be made in the saw blade, and if the saw blade is reversible, two symmetrically located recesses are required.

Claims (4)

467 10 15 KRAV467 10 15 REQUIREMENTS 1. Skyddsanordning vid sådana sàgsvärd för kedjesâgar som är glidbart rörliga i förhållande till en med kedjesågens motorenhet förenad fästplatta (11) under påverkan av en hydraulkolv (15), innefattande ett stift (18) som frán fästplattan kan skjuta in i ett tillsammans med sàgsvärdet rörligt urtag (19), k ä n n e t e c k n a d av att stiftet skjuter ut från ett oljerum (23) som står under tryck när kedjeságen är i drift.Protective device for saws for chainsaws which are slidably movable in relation to a mounting plate (11) connected to the chain saw motor unit under the action of a hydraulic piston (15), comprising a pin (18) which from the mounting plate can slide into a joint with the saw value movable recess (19), characterized in that the pin projects from an oil chamber (23) which is under pressure when the chain saw is in operation. 2. Skyddsanordning enligt krav 1, k ä n n e t e c k n a d av att stiftet skjuter ut fràn ett oljerum (23) som står i direkt förbindelse med hydraulkolvens oljerum (22).Protective device according to Claim 1, characterized in that the pin projects from an oil chamber (23) which is in direct connection with the oil chamber (22) of the hydraulic piston. 3. Skyddsanordning enligt krav 1, k ä n n e t e c k n a d av att urtaget (19) utåt avslutas med en sluttande ramp (20) som lyfter stiftet (18) när sågsvärdet pressas inåt mot 'fästplattan (ll).Protective device according to claim 1, characterized in that the recess (19) is terminated outwards with a sloping ramp (20) which lifts the pin (18) when the saw blade is pressed inwards against the mounting plate (11). 4. Skyddsanordning enligt krav 1,2 eller 3, k ä n n e t e c k n a d av att urtaget (19) är beläget i ett med sågsvärdet förenat glidbart mellanstycke (12). .. -w t:Protective device according to Claim 1, 2 or 3, characterized in that the recess (19) is located in a slidable intermediate piece (12) connected to the saw blade. .. -w t:
SE9102157A 1991-07-10 1991-07-10 SAFETY PROTECTION DEVICE SE9102157L (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9102157A SE9102157L (en) 1991-07-10 1991-07-10 SAFETY PROTECTION DEVICE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9102157A SE9102157L (en) 1991-07-10 1991-07-10 SAFETY PROTECTION DEVICE

Publications (3)

Publication Number Publication Date
SE9102157D0 SE9102157D0 (en) 1991-07-10
SE467454B true SE467454B (en) 1992-07-20
SE9102157L SE9102157L (en) 1992-07-20

Family

ID=20383316

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9102157A SE9102157L (en) 1991-07-10 1991-07-10 SAFETY PROTECTION DEVICE

Country Status (1)

Country Link
SE (1) SE9102157L (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998034768A1 (en) * 1997-02-06 1998-08-13 Sisu Logging Ab Valve arrangement
EP4400281A1 (en) * 2023-01-11 2024-07-17 Prinz Gmbh Sawing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998034768A1 (en) * 1997-02-06 1998-08-13 Sisu Logging Ab Valve arrangement
US6311599B1 (en) 1997-02-06 2001-11-06 Partek Forest Ab Valve arrangement
EP4400281A1 (en) * 2023-01-11 2024-07-17 Prinz Gmbh Sawing device

Also Published As

Publication number Publication date
SE9102157D0 (en) 1991-07-10
SE9102157L (en) 1992-07-20

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