US3802075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power driven hedge trimmer
Assignee: Boeing North American Inc
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Filing: 1972-06-23
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Granted: 1974-04-09
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Expires: 1992-06-23
Abstract
Abstract A power driven hedge trimmer having a substantially mirror image pair of cooperating, relatively reciprocable cutter blades and being operatively interchangeable one with the other for use as either the top blade or the bottom blade in a dual cutter blade assembly. The dual cutter blade assembly is supported from a support bar having one end received in a split clam shell housing. The support bar overlies the cutter blade assembly and is supported by the housing by being separably trapped at its one end between the halves of the clam shell housing. Another feature disclosed herein pertains to a pair of axially spaced bearing plates for journalling a motor armature shaft and gear-mounting shafts. The bearing plates are trapped in position between the halves of the split clam shell housing and are constructed in such a manner that forces tending to turn or twist the bearing plates will be about an axis aligning with the rotational axis of the armature shaft.
Inventors
- 👤 R Taylor
- 👤 J Sellers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:53
CPC Classifications
A; A01; A01G; A01G3/00; A01G3/04; A01G3/047; A01G3/053
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
259 words
In a power driven hedge trimmer, a pair of overlapping cooperating, relatively reciprocable cutter blades, a housing receiving corresponding ends of said cutter blades, and drive means for said cutter blades, said drive means being mounted in said housing and including a first gear which is mounted for rotation, means for rotating said first gear about a rotational axis, a crank assembly comprising a pair of raised bosses on opposite side faces of said first gear and a pair of connecting rods having corresponding ends respectively coaxially mounted on said bosses for rotation about the respective centers of said bosses, the opposite ends of said connecting rods being respectively pivotally connected to said corresponding ends of said cutter blades, said bosses being offset relative to each other and arranged eccentrically of said rotational axis to provide for the reciprocation of said blades respectively in opposite directions through the connections provided by said connecting rods, said means for rotating said first gear comprising (a) an electric motor having an armature shaft, (b) a second gear on said armature shaft, (c) and intermediate gear means drive connecting said second gear to said first gear, a pair of parallel spaced apart gear-mounting shafts respectively mounting said first gear and said gear means, and a pair of bearing plates spaced axially apart along the axes of said gearmounting shafts on opposite sides of said crank assembly, one of said bearing plates journalling corresponding ends of said gearmounting shafts, and the other of said bearing plates journalling the opposite ends of said gear-mounting shafts.
Claim 2
Dependent Claim
259 words
In a power driven hedge trimmer, a pair of overlapping cooperating, relatively reciprocable cutter blades, a housing receiving corresponding ends of said cutter blades, and drive means for said cutter blades, said drive means being mounted in said housing and including a first gear which is mounted for rotation, means for rotating said first gear about a rotational axis, a crank assembly comprising a pair of raised bosses on opposite side faces of said first gear and a pair of connecting rods having corresponding ends respectively coaxially mounted on said bosses for rotation about the respective centers of said bosses, the opposite ends of said connecting rods being respectively pivotally connected to said corresponding ends of said cutter blades, said bosses being offset relative to each other and arranged eccentrically of said rotational axis to provide for the reciprocation of said blades respectively in opposite directions through the connections provided by said connecting rods, said means for rotating said first gear comprising (a) an electric motor having an armature shaft, (b) a second gear on said armature shaft, (c) and intermediate gear means drive connecting said second gear to said first gear, a pair of parallel spaced apart gear-mounting shafts respectively mounting said first gear and said gear means, and a pair of bearing plates spaced axially apart along the axes of said gearmounting shafts on opposite sides of said crank assembly, one of said bearing plates journalling corresponding ends of said gearmounting shafts, and the other of said bearing plates journalling the opposite ends of said gear-mounting shafts.
Claim 3
Dependent Claim
176 words
In a power driven hedge trimmer, a pair of overlapping, elongated members having coacting sets of cutting teeth, a housing receiving corresponding ends of said members, drive means mounted in said housing and drive connected to at least one of said corresponding ends for reciprocating at least one of said members relative to the other, said drive means comprising means operatively connected to said at least one corresponding end and being operable to convert rotary motion into reciprocating motion for reciprocating said at least one member, a motor having a rotary output element and first and second gear means drive connecting said output element to said converting means, a pair of parallel spaced apart shafts respectively mounting said first and second gear means, and a pair of bearing plates formed separately of said housing and spaced axially apart along the axes of said shafts on opposite sides of said converting means, one of said bearing plates journalling corresponding ends of said shafts, and the other of said bearing plates journalling the opposite ends of said shafts.
Claim 4
Dependent Claim
176 words
In a power driven hedge trimmer, a pair of overlapping, elongated members having coacting sets of cutting teeth, a housing receiving corresponding ends of said members, drive means mounted in said housing and drive connected to at least one of said corresponding ends for reciprocating at least one of said members relative to the other, said drive means comprising means operatively connected to said at least one corresponding end and being operable to convert rotary motion into reciprocating motion for reciprocating said at least one member, a motor having a rotary output element and first and second gear means drive connecting said output element to said converting means, a pair of parallel spaced apart shafts respectively mounting said first and second gear means, and a pair of bearing plates formed separately of said housing and spaced axially apart along the axes of said shafts on opposite sides of said converting means, one of said bearing plates journalling corresponding ends of said shafts, and the other of said bearing plates journalling the opposite ends of said shafts.
Claim 5
Dependent Claim
59 words
The power driven hedge trimmer defined in claim 2 wherein both of said members are cutter blades, wherein said converting means is operatively connected to both of said corresponding ends to reciprocate said cutter blades respectively in opposite directions, and wherein said corresponding ends are in planes that transversely intersect the axes of said shafts between said bearing plates.
Claim 6
Dependent Claim
37 words
The power driven hedge trimmer defined in claim 3 wherein said housing has a bottom wall beneath said corresponding ends and wherein one of said bearing plates is seated on the interior surface of said bottom wall.
Claim 7
Dependent Claim
67 words
The power driven hedge trimmer defined in claim 2 wherein at least the portion of said housing receiving said drive means is divided into two separately formed, mating shells, and wherein said each of said bearing plates is trapped in position between cavity-defining interior wall surfaces of said shElls and is secured against transverse movement in said housing only by separable seating engagement with said cavity-defining surfaces.
Claim 8
Dependent Claim
30 words
The power driven hedge trimmer defined in claim 2 wherein said bearing plates are formed separately of said members, and wherein portions of said members are between said bearing plates.
References Cited (Backward Citations)
US2623283A
Cited
US3083457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |