IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0502756
(2003-01-16)
|
우선권정보 |
SE-0000219 (2002-01-28) |
국제출원번호 |
PCT//SE03/00056
(2004-08-09)
|
§371/§102 date |
20040809
(20040809)
|
국제공개번호 |
WO03//06412
(2003-08-07)
|
발명자
/ 주소 |
- Donnerdal, Ove
- Claesson, Tore
|
출원인 / 주소 |
- Aktiebolaget Electrolux (Publ)
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
4 |
초록
▼
The invention concerns a motor powered saw with a saw chain (2) and a guide bar (1), the rear portion of which is covered by a side cover (3) and during operation clamped with a certain clamping force between the side cover and a counter support on that side of the guide bar which is turned towards
The invention concerns a motor powered saw with a saw chain (2) and a guide bar (1), the rear portion of which is covered by a side cover (3) and during operation clamped with a certain clamping force between the side cover and a counter support on that side of the guide bar which is turned towards the motor, tensioning elements being provided for tensioning the saw chain by displacing the guide bar forwards, when the guide bar has been loosened by easing the clamping force, and elements for securing the guide bar in a new position. The characteristic features of the invention are that a rotation element (4) is mounted or mountable on the exterior of the side cover for easing said clamping force by rotating the rotating element a first angle of rotation; for activating said tensioning elements by continued rotation of the rotation element a further, second angle of rotation, said tensioning elements comprising a guide bar displacer (50, 50′) for displacing the guide bar forwards to anew position for tensioning the chain; and for reclamping the guide bar, but now in the new position, by returning the rotation element to its starting position.
대표청구항
▼
1. Motor powered saw with a saw chain (2) and a guide bar (1), the rear portion of which is covered by a side cover (3) and during operation clamped with a certain clamping force between the side cover and a counter support on that side of the guide bar which is turned towards the motor, tensioning
1. Motor powered saw with a saw chain (2) and a guide bar (1), the rear portion of which is covered by a side cover (3) and during operation clamped with a certain clamping force between the side cover and a counter support on that side of the guide bar which is turned towards the motor, tensioning elements being provided for tensioning the saw chain by displacing the guide bar forwards, when the guide bar has been loosened by easing the clamping force, and elements for securing the guide bar in a new position, characterized in that a rotation element (4) is mounted or mountable on the exterior of the side cover for easing said clamping force by rotating the rotating element a first angle of rotation; for activating said tensioning elements by continued rotation of the rotation element a further, second angle of rotation, said tensioning elements comprising a guide bar displacer (50,50′) for displacing the guide bar forwards to a new position for tensioning the chain; and for reclamping the guide bar, but now in the new position, by returning the rotation element to its starting position.2. Motor powered saw according to claim 1, characterized in that said guide bar displacer is provided with a tensioning pin (54,54′) which extends sidewise into a hole (56) in the guide bar, that a tensioning lever (30,30′) is provided and is rotatable by said rotation element and capable of displacing the guide bar displacer in a direction towards the guide bar nose as the rotation element is rotated said second angle of rotation, and that at least one anti-reverse motion device (68, 81, 83) is provided to prevent the guide bar displacer and thence the guide bar to move, when said rotation element has been rotated back to the starting position.3. Motor powered saw according to claim 2, characterized in that the guide bar displacer is provided with backwards directed teeth (52) and that said anti-reverse motion device consists of a pawl with a point (62), which is in engagement with any of said teeth in a locking position of the guide bar displacer.4. Motor powered saw according to claim 3, characterized in that the guide bar displacer consists of a slide, which is displaceable in the longitudinal direction of the guide bar, and that said teeth (52) form a straight row of teeth on the guide bar displacer, parallel with the longitudinal direction of the guide bar.5. Motor powered saw according to claim 2, characterized in that the guide bar displacer comprises a nut (50′), which is displaceable in the longitudinal direction in a groove (92), and that said anti-reverse motion device comprises a screw (81), which is screwed through the nut and extends in said groove (92).6. Motor powered saw according to claim 5, characterized in that said anti-reverse motion device comprises a rubber body (83), which in the working condition of the saw is fixedly pressed against a screw head (80) of the screw.7. Motor powered saw according to claim 1, characterized in that the guide bar displacer comprises a nut (50′), that a screw (81) which matches the nut extends through the nut in the longitudinal direction of the guide bar, and that a head (80) of the screw is accessible on the exterior of the side cover through a hole (75) in the side cover.8. Motor powered saw according to claim 1, characterized in that the tensioning lever (30, 30′) is rotatable by means of a rotating sleeve (15), which is provided to be rotated by said rotation element (4).9. Motor powered saw according to claim 8, characterized in that the rotating sleeve (15) is provided to be initially rotated a certain angle from that position which the rotating sleeve normally occupies when the guide bar is clamped between the side cover and said support, and that the rotating sleeve does not act on the tensioning lever (30, 30′) during said initial rotation.10. Motor powered saw according to claim 1, characterized in that the rotation element is joined to or can be joined to a nut (18) on the exterior of the side cover, which nut cooperates with a guide bar screw (20) which extends through the guide bar and which is non-rotatably secured to said support for the achievement of said clamping force.11. Motor powered saw according to claim 1, characterized in that said anti-reverse motion device (60) is connected to the tensioning lever (30) by means of a spring (40).12. Motor powered saw according to claim 1, characterized in that said tensioning lever and guide bar displacer are substantially covered by a cover disc (70, 70′) which rests against the guide bar.13. Motor powered saw according to claim 2, characterized in that said tensioning lever and said guide bar displacer are substantially provided in recesses in a clamping plate (7, 7′) which faces the guide bar on the interior of the side cover.14. Motor powered saw according to claim 2, characterized in that said tensioning lever and said guide bar displacer are substantially provided in a unit on the exterior of the side cover.15. Motor powered saw according to claim 2, characterized in that said tensioning lever and said guide bar displacer are substantially provided in recesses in said support (21).16. Motor powered saw according to claim 15, characterized in that said support consists of a guide bar support (21), which is mounted on a crankcase (23) or other part of the drive machinery of the motor powered saw.
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