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An apparatus for the cutting of tree limbs includes an extensible drive shaft that is detachably-attachable at one end to a portable electric drill and is secured to a housing at an opposite end thereof. The housing converts the rotary motion that is supplied by the drill into reciprocating motion o

An apparatus for the cutting of tree limbs includes an extensible drive shaft that is detachably-attachable at one end to a portable electric drill and is secured to a housing at an opposite end thereof. The housing converts the rotary motion that is supplied by the drill into reciprocating motion of a saw blade and it disposes the saw blade at an angle with respect to the drive shaft that is slightly less than 90 degrees. An extensible two-part cylindrical outer sleeve covers the drive shaft and is detachably-attached at one end thereof to the drill and at an opposite end to the housing. A hook is provided in the housing and is used to grab and urge severed limbs where desired. An optional clamping mechanism is attached to the housing and is used initially to urge the blade and the limb toward each other during cutting and then to retain the limb proximate the housing after it has been cut for controlled placement and safe release of the limb.

대표청구항 ▼

1. A reciprocating pruning saw, comprising: (a) a drive shaft;(b) means for converting rotary motion into reciprocal motion, said means for converting attached to a first end of said drive shaft;(c) means for attaching a motor to said drive shaft at a second end of said drive shaft that is distally

1. A reciprocating pruning saw, comprising: (a) a drive shaft;(b) means for converting rotary motion into reciprocal motion, said means for converting attached to a first end of said drive shaft;(c) means for attaching a motor to said drive shaft at a second end of said drive shaft that is distally disposed with respect to said first end, wherein said means for attaching a motor to said drive shaft includes an outer sleeve that is disposed over said drive shaft, and wherein said outer sleeve includes an upper outer sleeve and a lower outer sleeve, and wherein a lower end of said upper outer sleeve is disposed in an upper end of said lower outer sleeve, and wherein said upper outer sleeve is adapted to retract into said lower outer sleeve and to extend therefrom a predetermined distance, and including means for securing said upper outer sleeve relative to said lower outer sleeve at a desired position, and including means for coupling a lower end of said lower outer sleeve to said motor, and wherein said motor includes an electric drill, and wherein a drill chuck of said electric drill is adapted to engage with a lower end of said drive shaft, and wherein said means for coupling a lower end of said lower outer sleeve to said motor includes an adapter plate that is able to cooperatively engage with a nose portion of said electric drill and wherein said adapter plate is attachable to said lower outer sleeve; and(d) means for attaching a saw blade to said means for converting, wherein said saw blade is able to experience said reciprocal motion when said saw blade is attached to said means for converting and when said motor is energized. 2. The reciprocating pruning saw of claim 1 wherein said means for converting rotary motion into reciprocal motion includes a housing, and wherein said housing includes a drive gear that is coupled to a driven shaft, and wherein said drive gear is cooperatively engaged with a main gear, and wherein said main gear includes an eccentric, and including means for mechanically connecting said eccentric to said saw blade. 3. The reciprocating pruning saw of claim 2 wherein said means for mechanically connecting said eccentric to said saw blade includes an oscillating member that is pivotally connected to said eccentric, and wherein said oscillating member is cooperatively engaged with a piston, and wherein said piston is disposed in a longitudinal channel and wherein said piston is adapted to be urged longitudinally in said channel by said oscillating member, and wherein an end of said saw blade is attached to said piston. 4. The reciprocating pruning saw of claim 3 including a first coil spring disposed in said longitudinal channel and a second coil spring disposed in said longitudinal channel and including means for compressing said first coil spring in response to motion by said piston in a first direction and including means for compressing said second coil spring in response to motion by said piston in an opposite second direction. 5. The reciprocating pruning saw of claim 2 wherein said housing includes a channel therein proximate an end of said saw blade, and wherein said channel includes a first opening at said end of said saw blade and a second opening that is disposed in said housing proximate said first opening, and wherein said second opening is adapted to discharge saw dust away from said housing. 6. The reciprocating pruning saw of claim 2 wherein said housing includes a hook-shaped end, and wherein said hook-shaped end is attached to said housing at an opposite end of said housing where said saw blade is attached thereto, and wherein said hook-shaped end is adapted to snag a severed limb and urge it in a predetermined direction. 7. The reciprocating pruning saw of claim 2 wherein said saw blade includes a longitudinal axis and wherein said drive shaft includes a longitudinal axis and wherein an angle between said longitudinal axis of said saw blade and said longitudinal axis of said drive shaft is greater than 45 degrees and is less than 90 degrees. 8. The reciprocating pruning saw of claim 1 wherein said means for coupling includes a shroud that includes a bell-shaped first end, an opposite second end that includes outside threads, and a barrel there-between, and wherein said barrel includes a cylindrical opening that has an inside diameter that is greater than an outside diameter of said lower outer sleeve, and wherein said shroud is disposed over said lower outer sleeve, and wherein said bell-shaped first end includes at least one recess, and wherein said adapter plate includes a protrusion that is adapted to enter into said at least one recess sufficient to prevent rotary motion by said adapter plate relative to said shroud, and including a rubber ring disposed over said lower outer sleeve adjacent to said outside threads, and including a lower collet that includes inside threads that are adapted to cooperate with said outside threads, and wherein said lower collet is disposed on said lower outer sleeve adjacent to a side of said rubber ring that is away from said shroud, and wherein when said lower collet is threaded to said shroud and sufficiently tightened thereto, said lower collet urges said rubber ring toward said shroud and also onto said lower outer sleeve sufficient to secure said shroud to said lower outer sleeve. 9. The reciprocating pruning saw of claim 8 including a rubber cone that is disposed between said adapter plate and said nose portion of said drill. 10. The reciprocating pruning saw of claim 8 wherein said adapter plate includes a split ring, and wherein said split ring is adapted to encircle a portion of said drill, and including means for securing said split ring to said drill. 11. The reciprocating pruning saw of claim 1 including means for maintaining said drive shaft and a driven shaft concentrically within said outer sleeve and wherein said drive shaft and said driven shaft are adapted to rotate about a center longitudinal axis thereof. 12. The reciprocating pruning saw of claim 11 including an extensible bushing disposed in said lower outer sleeve, and wherein said extensible bushing is adapted to move longitudinally in said lower outer sleeve in response to the degree of retraction or the degree of extension of said drive shaft with respect to said driven shaft. 13. The reciprocating pruning saw of claim 1 wherein said saw blade includes saw teeth disposed along at least a portion of a bottom edge thereof and including top saw teeth that are disposed along at least a portion of a top edge thereof, said top edge being disposed on an edge of said saw blade that is opposite with respect to said bottom edge. 14. The reciprocating pruning saw of claim 1 wherein said means for converting rotary motion into reciprocal motion is disposed in a housing, and wherein said housing includes a clamping mechanism that is pivotally attached to said housing, and wherein said clamping mechanism includes an upper jaw and a lower jaw that are adapted to pivot with respect to each other and wherein said upper jaw and said lower jaw are parallel with a plane of said saw blade and are disposed adjacent thereto. 15. The reciprocating pruning saw of claim 1 wherein said means for converting rotary motion into reciprocal motion is disposed in a housing, and wherein said housing includes an abutment, said abutment able to retain said housing relative to a limb to be cut during a cutting of said limb by said reciprocating pruning saw. 16. The reciprocating pruning saw of claim 15 wherein said abutment includes a generally V-shape thereto and wherein said abutment is adapted to pivot about an axis with respect to said housing. 17. A reciprocating pruning saw, comprising: (a) a drive shaft;(b) means for converting rotary motion into reciprocal motion, said means for converting attached to a first end of said drive shaft;(c) means for attaching a motor to said drive shaft at a second end of said drive shaft that is distally disposed with respect to said first end, wherein said means for attaching a motor to said drive shaft includes an outer sleeve that is disposed over said drive shaft, and wherein said outer sleeve includes an upper outer sleeve and a lower outer sleeve, and wherein a lower end of said upper outer sleeve is disposed in an upper end of said lower outer sleeve, and wherein said upper outer sleeve is adapted to retract into said lower cuter sleeve and to extend therefrom a predetermined distance, and including means for securing said upper outer sleeve relative to said lower outer sleeve at a desired position, and including means for maintaining said drive shaft and a driven shaft concentrically within said outer sleeve, and wherein said drive shaft and said driven shaft are adapted to rotate about a center longitudinal axis thereof, and an extensible bushing disposed in said lower outer sleeve, and wherein said extensible bushing is adapted to move longitudinally in said lower outer sleeve in response to the degree of retraction or the degree of extension of said drive shaft with respect to said driven shaft; and(d) means for attaching a saw blade to said means for converting, wherein said saw blade is able to experience said reciprocal motion when said saw blade is attached to said means for converting and when said motor is energized.