EP0067485B1 - Sägevorrichtung - Google Patents

Sägevorrichtung Download PDF

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Publication number
EP0067485B1
EP0067485B1 EP82200709A EP82200709A EP0067485B1 EP 0067485 B1 EP0067485 B1 EP 0067485B1 EP 82200709 A EP82200709 A EP 82200709A EP 82200709 A EP82200709 A EP 82200709A EP 0067485 B1 EP0067485 B1 EP 0067485B1
Authority
EP
European Patent Office
Prior art keywords
clutch
pawl
housing
sawing
motor
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
Application number
EP82200709A
Other languages
English (en)
French (fr)
Other versions
EP0067485A3 (en
EP0067485A2 (de
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/de
Publication of EP0067485A3 publication Critical patent/EP0067485A3/en
Application granted granted Critical
Publication of EP0067485B1 publication Critical patent/EP0067485B1/de
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 accommodated in said housing and driving through a transmission with a starting clutch, a sprocket for a sawing chain passed around a guide and comprising a mechanism for putting said drive out of operation, said mechanism having a member for actuating a second clutch arranged between the motor and said starting clutch of the transmission provided with a cam surface for the axial movement of one part of the second clutch, and being retained against a biasing spring force by means of a releasable safety pawl in a position in which the second clutch is in engagement, said pawl being controlled by a mass of inertia, formed by a manually operable lever rotatably arranged around an axis transverse of the sawing chain blade.
  • a sawing device as set forth in the preamble is known from US-A-3.839.795.
  • the releasable safety pawl in the sawing device is controlled by the handle having its pivot located such that the length of the handle is relatively short.
  • the handle having its pivot located such that the length of the handle is relatively short.
  • the safety clutch will be activated without manual operation. Therefore one needs a certain mass of the handle giving enough moment of inertia to control a safety pawl.
  • a short length asks for a relatively high weight of the mass, contributing to the total weight of the sawing device. This is disadvantage for the maniability of said device.
  • the invention has for its object to overcome above mentioned disadvantage and to provide a device having a mechanism such that upon actuation thereof the chain stops substantially without delay without the need for the motor to held.
  • This device is distinguished in that the lever is rotatable around an axis underneath the sawing chain blade, said lever being coupled to said pawl through a lost-motion member and that the plate member is pivotable about an axis parallel to the driving shaft and is provided with a relief rim for the axial movement of one part of the clutch.
  • 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 device is distinguished in that the control plate member, the pawl and the biasing spring are accommodated in a closed housing part, which is releasably connected with the housing part comprising the motor and the drive.
  • This structure ensured an easily removable sub-housing, so exposing the change sprocket for easily mounting a new chain. Further 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 accommodating 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 and a drive for a sawing chain 5 passed around a master blade 4.
  • 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-member formed by a plate 13 (see Fig. 2), which is pivotable about'a a shaft 14 and accommodated in a releasable housing part 15.
  • the shaft 14 is parallel to the main driving shaft 7.
  • the plate has a reniform opening 32, 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 32 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 devi ⁇ e.
  • 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 bought 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 connection 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 operation 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 accommodating 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 compartment 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 clutch 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)

Claims (2)

1. Sägevorrichtung, die hauptsächlich folgende Teile umfaßt: ein Gehäuse (1) mit Handgriffen (2, 3), einen im Gehäuse angeordneten Motor, der über ein Getriebe mit Hochlaufkupplung (9) ein Kettenrad für eine Sägekette (5) antreibt, die um ein Führungsschwert (4) herumgeführt ist, und einen Mechanismus, der den Antrieb wirkungslos macht und ein Glied (13) aufweist, das eine zweite Kupplung (8) zwischen Motor und der Hochlauf--kupplung (9) des Getriebes betätigt und mit einer Nockenfläche (16) versehen ist, um ein Teil (8, 7) der zweiten Kupplung (8) axial zu verschieben, wobei das Glied (13) gegen die Kraft einer Vorspannfeder (19) durch einen lösbaren Sicherheits-Sperrhebel (27) in einer Stellung gehalten wird, in der die zweite Kupplung eingerückt ist, wobei der Sperrhebel (27) durch eine Trägheitsmasse auslösbar ist, die von einem manuell bedienbaren Hebel (25) gebildet ist, der um eine Achse (22) quer zum Sägekettenführungsschwert (4) drehbar gelagert ist, dadurch gekennzeichnet, daß der Hebel (25) um eine Achse (22) unter dem Sägekettenführungsschwert (4) drehbar ist, daß der Hebel (25) mit dem Sperrhebel (27) über ein Totgangglied (26) gekuppelt ist, und daß das plattenartige Glied (13) um eine Achse (14) parallel zur Antriebswelle (7) verschwenkbar ist und einen vorstehenden Nockenrand (16) zur axialen Verschiebung eines Teils der Kupplung (8) aufweist.
2. Vorrichtung nach Anspruch 1, dadurch gekkenzeichnet, daß das plattenartige Glied (13), der Sperrhebel (27) und die Vorspannfeder (19) in einem geschlossenen Gehäuseteil (15, 30) untergebracht sind, der lösbar mit dem Gehäuseteil (24) verbunden ist, der den Motor und den Antrieb aufnimmt.
EP82200709A 1981-06-11 1982-06-09 Sägevorrichtung Expired EP0067485B1 (de)

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 EP0067485A2 (de) 1982-12-22
EP0067485A3 EP0067485A3 (en) 1983-08-17
EP0067485B1 true EP0067485B1 (de) 1987-05-06

Family

ID=19837620

Family Applications (1)

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

Country Status (4)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK0387562T3 (da) * 1989-03-11 1993-03-29 Heinrich Kesper Sværd til motorkædesave
DE4120875C2 (de) * 1991-06-21 2000-06-08 Stihl Maschf Andreas Motorkettensäge mit im Kettenraddeckel integrierter Bremsvorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2353479A1 (de) * 1973-10-25 1975-04-30 Stihl Maschf Andreas Motorsaege, insbesondere motorkettensaege
DE2610085A1 (de) * 1976-03-11 1977-09-22 Stihl Maschf Andreas Motorsaege, insbesondere motorkettensaege
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

Also Published As

Publication number Publication date
EP0067485A3 (en) 1983-08-17
NO152537C (no) 1985-10-16
NO152537B (no) 1985-07-08
NO821914L (no) 1982-12-13
NL8102814A (nl) 1983-01-03
DE3276228D1 (en) 1987-06-11
EP0067485A2 (de) 1982-12-22

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