초록 ▼

A brake triggering device with a pivotably mounted trigger arm (1) located in connection to a handheld working tool's, mainly a chain saw's (2), rear handle (3), with a throttle control (4) and a handle opening (5) located below the handle (3), so that the trigger arm (1), when the saw changes incli

A brake triggering device with a pivotably mounted trigger arm (1) located in connection to a handheld working tool's, mainly a chain saw's (2), rear handle (3), with a throttle control (4) and a handle opening (5) located below the handle (3), so that the trigger arm (1), when the saw changes inclination in relation to the operator's forearm, e.g. at the event of kickback or fall, is actuated by the operator's hand or arm, whereby the trigger arm (1) via a transfer mechanism actuates a brake (9) so that this stops the movement of the saw chain. The pivot (10) of the trigger arm is located in connection to a front (11) or a bottom (12) side of the handle opening (5).

대표청구항 ▼

1. A handheld chain saw (2) with a pivotably mounted trigger arm (1) located in connection to a rear handle (3) of the chain saw (2), which is also equipped with a front handle (24) with a kick-back guard (23) located in front of the front handle (24), the rear handle (3) being equipped with a throt

1. A handheld chain saw (2) with a pivotably mounted trigger arm (1) located in connection to a rear handle (3) of the chain saw (2), which is also equipped with a front handle (24) with a kick-back guard (23) located in front of the front handle (24), the rear handle (3) being equipped with a throttle control (4) and a handle opening (5) located below the rear handle (3), so that the trigger arm (1), when the chain saw changes inclination in relation to an operator's forearm, is actuated by the operator's hand or arm, whereby the trigger arm (1) via a transfer mechanism (6, 7, 8, 40) actuates a brake (9) so that this stops the movement of a saw chain, wherein a pivot (10) of the trigger arm is located in connection to a front (11) or a bottom (12) side of the handle opening (5).2. A handheld chain saw according to claim 1, wherein the pivot (10) of the trigger arm is located in front of the handle opening (5).3. A handheld chain saw according to claim 1, wherein at least one of the trigger arm and a handle unit (15), which includes the rear handle (3), is so arranged that the trigger arm is laterally guided by at least a part of the trigger arm (1) located between its pivot and its respective outer end (13, 19).4. A handheld chain saw according to claim 3, wherein the lateral guide is arranged at a part of the trigger arm (1) located between its pivot (10) and its protruding outer end (13) above the rear handle.5. A handheld chain saw in according to claim 4, wherein the lateral guide includes a trigger arm protruding part (18), arranged so that it will create a groove (17) between itself and another part of the trigger arm, and a handle protruding part (16) shaped as a hook (16) or an L-profile, which protrudes down into the groove (17) and runs in it.6. A handheld chain saw according to claim 1, wherein an abutment (14) is arranged on the tool so that it cooperates with the trigger arm at a part of the trigger arm located between its pivot (10) and its respective outer end (13, 19), so that when the operator's hand or arm violently actuates the trigger arm this will be pressed against the abutment (14), resulting in reduced load on the transfer mechanism (6, 7, 8).7. A handheld chain saw according to claim 1, wherein the trigger arm is located on one side of the rear handle (3) and a therewith integrated handle unit (15) in front of the handle opening (5).8. A handheld chain saw according to claim 1, wherein the trigger arm is embodied as a double-armed trigger arm, where its protruding outer end (13) is located above the rear handle and its other outer end (19) is connected to a part of the transfer mechanism (6).9. A power tool, having a power driven tool implement that moves, and a rear handle for manual grasping by an operator of the power tool, the rear handle being located at a distal end portion of the power tool from the tool implement and partially bounding a handle opening, the handle opening having a rear side adjacent to an end of the tool, a front side closer to the tool implement than the rear side, and a bottom side adjacent to a bottom of the tool, the tool also having a front handle with a kick-back guard located in front of the front handle and the tool also having a brake mechanism actuatable for stopping movement of the tool implement, and a transfer mechanism for transferring an actuating force to the brake mechanism, the triggering device including:a trigger arm pivotable responsive a condition associated with a desire to stop movement of the tool; means pivotally mounting the trigger arm on the tool at a location adjacent to the rear handle, and means connecting the trigger arm to the transfer mechanism such that pivoting of the trigger arm transfers an actuating force to the brake mechanism; wherein the means pivotally mounts the trigger arm on the tool at a location that is at least one of: (a) forward of the front side of the handle opening and (b) below the bottom side of the handle opening. 10. A power tool as set forth in claim 9, wherein the location that the trigger arm is pivotally mounted on the tool is adjacent to the front side of the handle opening.11. A power tool as set forth in claim 9, wherein the location that the trigger arm is pivotally mounted on the tool is adjacent to the bottom side of the handle opening.12. A power tool as set forth in claim 9, wherein the trigger arm has a portion that cooperates with a portion of the rear handle to guide pivot movement of the trigger arm.13. A power tool as set forth in claim 12, wherein the trigger arm has an outer end located distal from the means pivotally mounting the trigger arm on the tool, the portion of the trigger arm that cooperates to guide pivot movement is located on the trigger arm between the outer end of the trigger arm and the means pivotally mounting the trigger arm on the tool.14. A power tool as set forth in claim 9, wherein the tool has an abutment, the trigger arm having a portion engagable with the abutment during application of a force to the trigger arm to limit an amount of force transmitted to the transfer mechanism.15. A power tool as set forth in claim 9, wherein the trigger arm extends along one lateral side of the rear handle.16. A power tool as set forth in claim 9, wherein the trigger arm has a protruding part that partially bounds a groove on the trigger arm, the rear handle has a hook-shaped part protruding into the groove on the trigger arm, and the trigger arm protruding part and the hook-shaped part cooperate to guide pivot movement of the trigger arm.17. A power tool as set forth in claim 9, wherein the means pivotally mounting the trigger arm on the tool pivotally supports the trigger arm at an intermediate location along the trigger arm, the trigger arm has a first portion, located on a first side of the means pivotally mounting, extending above the rear handle, and a second portion, located on a second side of the means pivotally mounting, interacting with the transfer mechanism.18. A power tool as set forth in claim 9, wherein the trigger arm has two relatively movable parts.19. A power tool as set forth in claim 18, wherein the means pivotally mounting the trigger arm on the tool mounts the trigger arm at a first of the trigger arm parts, and a second of the trigger arm parts is pivotable relative to the first trigger arm part.20. A power tool as set forth in claim 19, wherein the trigger arm includes a bias spring, the second trigger arm part is biased by the spring toward a first pivot position relative to the first trigger arm part, and the second trigger arm part is pivotable toward a second pivot position relative to the first trigger arm part against the bias of the spring.21. A power tool as set forth in claim 20, wherein the first position of the second trigger arm part is located relatively away from the rear handle and the second position of the second trigger arm part is located relatively toward the rear handle.22. A power tool as set forth in claim 19, wherein force applied to the second trigger arm part in one direction causes pivot movement of the trigger arm relative to the tool at the means pivotally mounting the trigger arm on the tool, and force applied to the second trigger arm part in another direction causes pivot movement of the second trigger arm part relative to the first trigger arm part.23. A power tool including:a power driven tool implement that moves; a rear handle for manual grasping by an operator of the power tool, the rear handle being located at a distal end of the power tool from the tool implement and partially bounding a handle opening, the rear handle opening having a rear side adjacent to an end of the tool, a front side closer to the tool implement than the rear side, and bottom side adjacent to a bottom of the tool; a front handle with a kick-back guard located in front of the front handle; a brake mechanism actuatable for stopping movement of the tool, implement; a transfer mechanism for transferring an actuating force to the brake mechanism; and a brake triggering device including: a trigger arm pivotable responsive a condition associated with a desire to stop movement of the tool; means pivotally mounting the trigger arm on the tool at a location adjacent to the rear handle, and means connecting the trigger arm to the transfer mechanism such that pivoting of the trigger arm transfers an actuating force to the brake mechanism, the means pivotally mounts the trigger arm on the tool at a location that is at least one of: (a) forward of the front side of the handle opening and (b) below the bottom side of the handle opening. 24. A power tool as set forth in claim 23, wherein the location that the trigger arm is pivotally mounted on the tool is adjacent to the front side of the handle opening.25. A power tool as set forth in claim 23, wherein the location that the trigger arm is pivotally mounted on the tool is adjacent to the bottom side of the handle opening.26. A power tool as set forth in claim 23, wherein the trigger arm and the rear handle have cooperating portions that guide pivot movement of the trigger arm.27. A power tool as set forth in claim 26, wherein the trigger arm has an outer end located distal from the means pivotally mounting the trigger arm on the tool, the portion of the trigger arm that cooperates to guide pivot movement is located on the trigger arm between the outer end of the trigger arm and the means pivotally mounting the trigger arm on the tool.28. A power tool as set forth in claim 23, wherein the tool has an abutment, the trigger arm having a portion engagable with the abutment during application of a force to the trigger arm to limit an amount of force transmitted to the transfer mechanism.29. A power tool as set forth in claim 23, wherein the trigger arm extends along one lateral side of the rear handle.30. A power tool as set forth in claim 23, wherein the trigger arm has a protruding part that partially bounds a groove on the trigger arm, the rear handle has a hook-shaped part protruding into the groove on the trigger arm, and the trigger arm protruding part and the hook-shaped part cooperate to guide pivot movement of the trigger arm.31. A power tool as set forth in claim 23, wherein the means pivotally mounting the trigger arm on the tool pivotally supports the trigger arm at an intermediate location along the trigger arm, the trigger arm has a first portion, located on a first side of the means pivotally mounting, extending above the rear handle, and a second portion, located on a second side of the means pivotally mounting, interacting with the transfer mechanism.32. A power tool as set forth in claim 23, wherein the trigger arm has two relatively movable parts.33. A power tool as set forth in claim 32, wherein the means pivotally mounting the trigger arm on the tool mounts the trigger arm at a first of the trigger arm parts, and a second of the trigger arm parts is pivotable relative to the first trigger arm part.34. A power tool as set forth in claim 33, wherein the trigger arm includes a bias spring, the second trigger arm part is biased by the spring toward a first pivot position relative to the first trigger arm part, and the second trigger arm part is pivotable toward a second pivot position relative to the first trigger arm part against the bias of the spring.35. A power tool as set forth in claim 34, wherein the first position of the second trigger arm part is located relatively away from the rear handle and the second position of the second trigger arm part is located relatively toward the rear handle.36. A power tool as set forth in claim 33, wherein force applied to the second trigger arm part in one direction causes pivot movement of the trigger arm relative to the tool at the means pivotally mounting the trigger arm on the tool, and force applied to the second trigger arm part in another direction causes pivot movement of the second trigger arm part relative to the first trigger arm part.