EP0067485A2 - Dispositif de sciage - Google Patents

Dispositif de sciage Download PDF

Info

Publication number
EP0067485A2
EP0067485A2 EP82200709A EP82200709A EP0067485A2 EP 0067485 A2 EP0067485 A2 EP 0067485A2 EP 82200709 A EP82200709 A EP 82200709A EP 82200709 A EP82200709 A EP 82200709A EP 0067485 A2 EP0067485 A2 EP 0067485A2
Authority
EP
European Patent Office
Prior art keywords
clutch
housing
motor
pawl
sprocket
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
EP82200709A
Other languages
German (de)
English (en)
Other versions
EP0067485B1 (fr
EP0067485A3 (en
Inventor
Jan Wilhelmus Leemans
Jan Peter Houben
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.)
Skil Nederland BV
Original Assignee
Skil Nederland BV
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 Skil Nederland BV filed Critical Skil Nederland BV
Publication of EP0067485A2 publication Critical patent/EP0067485A2/fr
Publication of EP0067485A3 publication Critical patent/EP0067485A3/en
Application granted granted Critical
Publication of EP0067485B1 publication Critical patent/EP0067485B1/fr
Expired 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
    • B27B17/08—Drives or gearings; Devices for swivelling or tilting the chain saw
    • B27B17/083—Devices for arresting movement of the saw chain

Definitions

  • the invention relates to a sawing device mainly comprising a housing with handles, a motor arranged in said housing and driving through a transmission with a starting clutch a sprocket for a saw chain passed around a guide and a mechanism for putting said drive out of operation.
  • the invention has for its object to provide a device provided with a mechanism such that upon actuation thereof the chain stops substantially without delay without the need for the motor to halt.
  • This device is distinguished in that the mechanism comprise a member controlling a second clutch arranged between the sprocket and the starting clutch in the transmission, said member being retained against a bias force by means of a disengageable safety pawl in a position in which the clutch is in mesh.
  • the control-member can be displaced by the bias force immediately after the pawl is released, said control-member putting the clutch out of operation.
  • the drive between motor and sprocket is interrupted.
  • the pawl is preferably actuated by a mass which is rotatable about an axis transverse of the sawing plane.
  • the mass has a given inertia so that it disengages the pawl when the housing experiences and abrupt movement in the sawing plane, for example, the saw "bites".
  • the mass is preferably formed by a lever which can be manually operated so that in the event of a conscious or unconscious awkward movement the user can release the pawl and cut off the drive.
  • control-member is formed by a plate pivotable about an axis parallel to the driving shaft and provided with a relief rim for the axial movement of the second clutch constructed in the form of a claw clutch.
  • Said plate can furthermore carry a skid which comes into contact with a brake surface connected with the sprocket.
  • a disturbance-free construction is ensured because, in accordance with the invention, the control-member, the pawl and a tensile spring supplying the bias force are accomodated in a closed housing part, which is releasably fastened to the housing part holding the motor and the drive.
  • the safety mechanism remains free of dust and dirt, for example, carried along by the sawdust.
  • the sawing device shown in Fig. 1 mainly comprises a housing 1 with two handles 2, 3, said housing accomodating a motor, for example, an electric motor and a drive for a sawing chain 5 passed around a master blade 4.
  • a motor for example, an electric motor
  • Figs. 2 and 3 show more in detail the drive which comprises a gear wheel transmission 6 rotating a main driving shaft 7.
  • the driving shaft 7 is provided with a claw clutch 8, the outer part 8' of which is non-rotatably, but slidably arranged on said end of the shaft.
  • the inner part 8" is rotatably journalled on the shaft 7 and constitutes the core of a centrifugal clutch 9, which is coaxial with the driving shaft 7.
  • the housing 10 of the centrifugal clutch is connected with a sprocket 11.
  • the centrifugal clutch comprises centrifugal shoes 12, which come into contact upon rotation of the inner part 8" with the housing 10.
  • the part 8' of the claw clutch can be displaced by a control-ember formed by a plate 13 (see Fig. 2), which is pivotable about a shaft 14 and accomodated in a releasable housing part 15.
  • the shaft 14 is parallel to the main driving shaft 7.
  • the plate has a reniform opening 15, which is narrow at the top end and has a relief rim 16 gripping below the collar 17 of the part 8' of the claw clutch.
  • the width of the opening 15 exceeds the diameter of the collar 17 of the part 8' .
  • the plate 13 is movable up and down in the housing part 15 around the spindle 14 by means of a handle 18 against the action of a bias force supplied by a tensile spring 19 stretched between a point 20 of the plate and a point of engagement 21 of the housing part 15.
  • a spindle 22 of square cross-section On the right-hand side (see Fig. 2) below the housing part 15 holds a spindle 22 of square cross-section...
  • the spindle 22 is journalled at 23 in the housing part 24 of the housing 1 comprising the motor and the transmission gear.
  • the spindle 23 is bent over upwards and terminates in a handle 25 located in front of and near the handle 2 of the sawing device.
  • the end of the spindle 23 located in the housing part 15 extends into a sleeve 26, which is rotatably journalled in the housing part 15.
  • the sleeve has a pawl 27, which can be brought into contact with a nose 28 of the control-plate 13.
  • the continuous hole in the sleeve 26 has a star-shaped cross-section such that a turn of the handle 25 in the direction of the arrow P1, that is to say, away from the handle 2 ensures a turn of the sleeve 26 and hence a turn of the pawl 27. In the reverse sense, however, a free stroke is ensured.
  • control-plate 13 On the side facing the centrifugal clutch the control-plate 13 has a skid 29, which in the lowermost position of the plate 13 shown in Fig. 2 by broken lines comes into contact with the housing 10 of the centrifugal clutch which is linked to the sprocket 11.
  • the device operates as follows.
  • the plate 13 is turned upwards around the pin 14 so that the claw clutch parts 8' and 8" engage one another. Then the connnection between the main driving shaft 7 and the central part of the centrifugal clutch is established.
  • the centrifugal clutch will become operative as a result of the rotation and the sprocket will rotate so that the chain 5 is moved along the blade 4 in the direction of the arrow P2.
  • Switching off normally occurs by changing over the main switch near the handle 3 so that the motor stops and the centrifugal clutch gets out of oepration at a given number of revolutions.
  • the skid 29 then comes into contact with the housing 10 of the centrifugal clutch so that the sprocket and hence the chain 5 are immediately halted.
  • the motor can run on in an unaltered manner.
  • the housing may be thrust upwards in the direction of the arrow P3 as the result of an abrupt shock, for example, due to "biting" of the saw at the tip, so that owing to inertia the handle 25 with the lever moves in the direction of the arrow P1 with respect to the housing 1. Then the mode of switching off is the same. As soon as the cause of the emergency stop is repaired, the user can again move the lever 18 upwards so that the claw clutch 8 becomes operative and the saw can again be used.
  • the maintenance of the whole device is facilitated by accomodating the entire safety mechanism comprising the plate 13, the pawl 27, the spring 19 in the separate housing part 15 , which has a separating wall 30 on the inner side.
  • the partition 30 is releasably fastened by bolts 31 in the housing part 15 and constitutes an effective screen between the sprocket 11 drawing in the sawdust and the arrangement in the housing 15.
  • the partition 30 has an opening which is sufficiently large for passing the housing 10 of the centrifugal clutch, and in the engaged state of the claw clutch 8 the width of the reniform opening 15 is such that the housing part 15 with the partition 30 can be removed so that the claw clutch, the centrifugal clutch and the sprocket are freely accessible.
  • the inertia mass formed by a lever may have a different shape and it need not be manually operable.
  • the star-shaped hole in the sleeve 26 may be square or have a different shape.
  • the claw clu-ch may be a dry-plate coupling.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Molding Of Porous Articles (AREA)
EP82200709A 1981-06-11 1982-06-09 Dispositif de sciage Expired EP0067485B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8102814 1981-06-11
NL8102814A NL8102814A (nl) 1981-06-11 1981-06-11 Zaaginrichting.

Publications (3)

Publication Number Publication Date
EP0067485A2 true EP0067485A2 (fr) 1982-12-22
EP0067485A3 EP0067485A3 (en) 1983-08-17
EP0067485B1 EP0067485B1 (fr) 1987-05-06

Family

ID=19837620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82200709A Expired EP0067485B1 (fr) 1981-06-11 1982-06-09 Dispositif de sciage

Country Status (4)

Country Link
EP (1) EP0067485B1 (fr)
DE (1) DE3276228D1 (fr)
NL (1) NL8102814A (fr)
NO (1) NO152537C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5035057A (en) * 1989-03-11 1991-07-30 Heinrich Kesper Chain guide for power chain saws
FR2677914A1 (fr) * 1991-06-21 1992-12-24 Stihl Andreas Scie a chaine equipee d'un dispositif de freinage integre au couvercle de roue a chaine.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991864A (en) * 1973-10-25 1976-11-16 Andreas Stihl Maschinenfabrik Motor saw, especially motor chain saw
FR2343567A2 (fr) * 1976-03-11 1977-10-07 Stihl Andreas Scie a moteur, notamment scie a moteur a chaine
US4053980A (en) * 1976-09-16 1977-10-18 Outboard Marine Corporation Chain saw including an overtorque releasing clutch
US4121339A (en) * 1977-08-10 1978-10-24 Milovan Nikolich Safety brake mechanism for chain saws

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991864A (en) * 1973-10-25 1976-11-16 Andreas Stihl Maschinenfabrik Motor saw, especially motor chain saw
FR2343567A2 (fr) * 1976-03-11 1977-10-07 Stihl Andreas Scie a moteur, notamment scie a moteur a chaine
US4053980A (en) * 1976-09-16 1977-10-18 Outboard Marine Corporation Chain saw including an overtorque releasing clutch
US4121339A (en) * 1977-08-10 1978-10-24 Milovan Nikolich Safety brake mechanism for chain saws

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5035057A (en) * 1989-03-11 1991-07-30 Heinrich Kesper Chain guide for power chain saws
FR2677914A1 (fr) * 1991-06-21 1992-12-24 Stihl Andreas Scie a chaine equipee d'un dispositif de freinage integre au couvercle de roue a chaine.

Also Published As

Publication number Publication date
NO152537C (no) 1985-10-16
EP0067485B1 (fr) 1987-05-06
NO821914L (no) 1982-12-13
NL8102814A (nl) 1983-01-03
EP0067485A3 (en) 1983-08-17
DE3276228D1 (en) 1987-06-11
NO152537B (no) 1985-07-08

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