A vegetation pruning device includes a cutting element; a guide bar for supporting the cutting element, the guide bar having a guide bar plane, the guide bar being pivotable in the guide bar plane about a fixed axis; a motor having a motor shaft for rotatably driving the cutting element; a motor hou
A vegetation pruning device includes a cutting element; a guide bar for supporting the cutting element, the guide bar having a guide bar plane, the guide bar being pivotable in the guide bar plane about a fixed axis; a motor having a motor shaft for rotatably driving the cutting element; a motor housing for receiving the motor; a guiding mechanism connected to the motor housing, the guiding mechanism having a longitudinal axis; a handle assembly operable to move linearly along the longitudinal axis; and a transmission device for connecting the handle assembly to the guide bar through, the transmission device converting a linearly movement of the handle assembly to a pivoting movement of the guide bar, the cutting element thereby approaching or withdrawing from a workpiece to be sawn.
대표청구항▼
1. A vegetation pruning device, comprising: a cutting element;a guide bar for supporting the cutting element, the guide bar having a guide bar plane, the guide bar being pivotable in the guide bar plane about a fixed axis;a motor having a motor shaft for rotatably driving the cutting element;a motor
1. A vegetation pruning device, comprising: a cutting element;a guide bar for supporting the cutting element, the guide bar having a guide bar plane, the guide bar being pivotable in the guide bar plane about a fixed axis;a motor having a motor shaft for rotatably driving the cutting element;a motor housing for receiving the motor;a guiding mechanism connected to the motor housing, the guiding mechanism having a longitudinal axis;a handle assembly operable to move linearly along the longitudinal axis; anda transmission device for connecting the handle assembly to the guide bar, the transmission device converting a linear movement of the handle assembly to a pivoting movement of the guide bar, the cutting element thereby approaching or withdrawing from a work piece to be sawn. 2. A vegetation pruning device according to claim 1, wherein the transmission device is configured as a crank mechanism. 3. A vegetation pruning device according to claim 2, wherein the crank mechanism comprises a driving part, a connecting part and a driven part, wherein the driving part is operable by the handle assembly, wherein the driven part is fixedly attached to the guide bar, wherein the connecting part is interposed between the driving part and the driven part, and wherein the connecting part is hinged to the driving part and to the driven part, respectively. 4. A vegetation pruning device according to claim 3, wherein the driven part is configured as V-shaped, wherein one side portion of the V-shaped driven part is hinged to the connecting part, wherein another side portion of the V-shaped driven part is fixedly secured to the guide bar, and wherein a bottom portion of the V-shaped driven part is pivotable about the fixed axis. 5. A vegetation pruning device according to claim 1, wherein the fixed axis is configured as the motor shaft axis. 6. A vegetation pruning device according to claim 1, comprising a driving device, the driving device is positioned between the motor shaft and the cutting element, wherein the driving device includes a sprocket having a sprocket rotation axis, wherein the sprocket is in meshing engagement with the cutting element so that the cutting element is running around the guide bar and the sprocket, and wherein the fixed axis is the sprocket rotation axis. 7. A vegetation pruning device according to claim 1, wherein the handle assembly comprises an extended front portion and a gripping portion. 8. A vegetation pruning device according to claim 7, wherein the front portion is configured as a longitudinal extension rod. 9. A vegetation pruning device according to claim 7, wherein the gripping portion is configured as D-shaped. 10. A vegetation pruning device according to claim 8, wherein the guiding mechanism is configured as a longitudinal extension tube having a longitudinal axis, wherein the extension rod is movably received in the longitudinal extension tube, so that the rod can move linearly along the longitudinal axis of the longitudinal extension tube. 11. A vegetation pruning device according to claim 10, wherein a locking device is associated with the longitudinal extension tube and the front portion. 12. A vegetation pruning device according to claim 9, wherein a control switch is built into the D-shaped gripping portion. 13. A vegetation pruning device according to claim 9, wherein a safety switch is symmetrically attached to both outer ends of the D-shaped gripping portion. 14. A vegetation pruning device according to claim 1, wherein the vegetation pruning device comprises a U-shaped guard. 15. A vegetation pruning device according to claim 14, wherein the guard comprises a first receiving room and a second receiving room, and wherein the cutting element is completely insertable into the first receiving room. 16. A vegetation pruning device according to claim 15, wherein the cutting element is at least partially insertable into the second receiving room. 17. A vegetation pruning device according to claim 14, wherein the U-shaped guard comprises a first supporting edge and a second supporting edge, which are connected to each other by a third supporting edge, and wherein the first, second and third supporting edges define together a U-shaped supporting edge. 18. A vegetation pruning device according to claim 14, wherein the U-shaped guard comprises a first end surface and a second end surface, wherein the first end surface and the second end surface have a common plane, wherein a supposed plane is perpendicular to the longitudinal axis, wherein the fixed axis is positioned in the supposed plane, wherein the longest distance between the points of the outermost portion of the cutting element and the supposed plane is less than or equal to the distance between the common plane of the first end surface and the second end surface and the supposed plane. 19. A vegetation pruning device according claim 1, wherein the transmission device is configured as a rack and pinion mechanism, the rack and pinion mechanism comprising a gear fixedly secured to the guide bar, and comprising a rack fixedly secured to the handle assembly, wherein the gear is in meshing engagement with the rack so that a linear movement of the rack can be changed to a pivotable movement of the gear. 20. A vegetation pruning device according to claim 1, wherein the transmission device is configured as a pulley mechanism, wherein the pulley mechanism includes a pulley and a rope, wherein the rope is mounted on the pulley, one end of the rope being fixed to the handle assembly, the other end of the rope being fixed to the motor housing, and wherein the pulley is fixedly coupled to the guide bar, so that a linear movement of the handle assembly can be changed to a pivotable movement of the guide bar. 21. A vegetation pruning device according to claim 1, wherein the transmission device is associated with the motor and operable to drive the motor and the guide bar to move together. 22. A vegetation pruning device according to claim 21, wherein the transmission device is configured as a synchronous belt drive mechanism. 23. A vegetation pruning device according to claim 22, wherein the handle assembly comprises a gear rack, and the synchronous belt drive mechanism comprises a drive gear which meshes with the gear rack. 24. A vegetation pruning device according to claim 22, wherein the synchronous belt drive mechanism comprises a follower bracket, and the guide bar is fixedly secured to the follower bracket. 25. A vegetation pruning device according to claim 24, wherein the follower bracket is fixedly secured to the motor, thereby the motor rotates together with the follower bracket when the follower bracket rotates. 26. A vegetation pruning device according to claim 21, further comprising a limiting mechanism for preventing the guide bar rotating to excess. 27. A vegetation pruning device according to claim 26, wherein the limiting mechanism comprise a limited bracket with three waist-shaped grooves formed along the circumference at equal intervals, and the motor comprises three projected columns formed at one end along the circumference at equal intervals, the three projected columns extending along the motor shaft and passing through the three waist-shaped grooves respectively. 28. A vegetation pruning device according to claim 21, further comprising a resilience mechanism. 29. A vegetation pruning device according to claim 28, further comprising a main housing, the transmission device being configured as a synchronous belt drive mechanism, the synchronous belt drive mechanism comprising a follower bracket, the resilience mechanism comprising a pin and a spiral spring, one end of the spiral spring being connected with the follower bracket pivotally, the other end of the spiral spring being provided with a chute, the main housing comprising a projected column accommodated in the chute, the spiral spring being mounted on the pin, one end of the spiral spring supported against the projected columns, the other end of the spiral spring being pressed against the end of the pin so as to be pressed against the follower bracket. 30. A vegetation pruning device according to claim 21, wherein the transmission device is configured as a plane multi-rod mechanism.
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이 특허에 인용된 특허 (12)
Causey Warren L. (2468 Lorna Dr. Melbourne FL 32935) Yeager Harvey P. (620 Cheyenne Ave. Melbourne FL 32935) Burchell Clarence (125 Squire Dr. Melbourne FL 32935), Adjustable utility extension handle for electrically powered handtool.
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