Patent US3774302A successfully refreshed from Google Patents.
US3774302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power driven grass shear
Assignee: Stanley Works
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Filing: 1972-01-04
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Granted: 1973-11-27
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Expires: 1992-01-04
Abstract
Abstract A shear for grass and the like includes a tooth plate on which is pivotally mounted a plurality of shearing members, each including a narrow and resiliently deformable blade element. The blade elements extend outwardly along the upper surface of the tooth plate, and each oscillates across one of the cutting recesses that are defined between adjacent teeth at one end of the plate. The outer ends of the blade elements are biased toward the tooth plate causing substantially point contact to exist between the cutting edges of the blade element and the side edges of the teeth as the blade elements wipe thereover. Preferably, the shear is power driven, and most desirably energy is supplied by a battery housed within the body thereof.
Inventors
- 👤 P Ketchpel
- 👤 C Stoutenberg
- 👤 E Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:54
CPC Classifications
A; A01; A01G; A01G3/00; A01G3/06; A01G3/067
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
286 words
In a shear, the combination comprising: a. a generally planar tooth plate having at one end thereof a multiplicity of tooth formations defining generally U-shaped cutting recesses therebetween; b. a plurality of shearing members each having a relatively narrow and resiliently deformable blade element extending outwardly along the upper surface of said one end of said tooth plate and having cutting edges extending along both side margins of the outer end portion thereof, each of said shearing members being individually pivotally mounted on said tooth plate inwardly from said one end thereof for movement across one of said cutting recesses, said shearing members extending in spaced relationship from the surface of said tooth plate over substantially the entire length thereof inwardly of the point of pivotal mounting thereof, said outer end portion of said blade element thereof being resiliently biased against said surface of said tooth plate and being oscillatable across the aligned cutting recess with said cutting edges thereof wiping the side edges of the tooth formations defining said recess; and c. drive means for oscillating said shearing members upon said tooth plate, said shearing members being attached adjacent their inner ends to said drive means at a point spaced above said upper surface of said tooth plate, said drive means tending to elevate said shearing members above said upper surface to minimize the area of contact therebetween and to enhance the shearing effect of said cutting edges of said blade elements, the bias of said shearing members tending to urge said outer end portions of said blade elements thereof through said cutting recesses and causing substantially point contact between said cutting edges and said side edges as said blade elements wipe said tooth formations.
Claim 2
Dependent Claim
286 words
In a shear, the combination comprising: a. a generally planar tooth plate having at one end thereof a multiplicity of tooth formations defining generally U-shaped cutting recesses therebetween; b. a plurality of shearing members each having a relatively narrow and resiliently deformable blade element extending outwardly along the upper surface of said one end of said tooth plate and having cutting edges extending along both side margins of the outer end portion thereof, each of said shearing members being individually pivotally mounted on said tooth plate inwardly from said one end thereof for movement across one of said cutting recesses, said shearing members extending in spaced relationship from the surface of said tooth plate over substantially the entire length thereof inwardly of the point of pivotal mounting thereof, said outer end portion of said blade element thereof being resiliently biased against said surface of said tooth plate and being oscillatable across the aligned cutting recess with said cutting edges thereof wiping the side edges of the tooth formations defining said recess; and c. drive means for oscillating said shearing members upon said tooth plate, said shearing members being attached adjacent their inner ends to said drive means at a point spaced above said upper surface of said tooth plate, said drive means tending to elevate said shearing members above said upper surface to minimize the area of contact therebetween and to enhance the shearing effect of said cutting edges of said blade elements, the bias of said shearing members tending to urge said outer end portions of said blade elements thereof through said cutting recesses and causing substantially point contact between said cutting edges and said side edges as said blade elements wipe said tooth formations.
Claim 3
Dependent Claim
19 words
The shear of claim 1 wherein said drive means includes an electric motor to render said shear power driven.
Claim 4
Dependent Claim
15 words
The shear of claim 2 additionally including a battery to provide energy for said motor.
Claim 5
Dependent Claim
120 words
The shear of claim 2 wherein said drive means includes a gear in driven engagement with said motor and having an axially projecting cam element eccentrically disposed on one side thereof, and a cam follower member having a cam surface extending parallel to said cam element for contact therewith and configured to impart oscillatory movement to said follower member upon rotation of said gear with said cam element contacting said cam surface, said shearing members being pivotally connected to said cam follower member and said cam element contacting said cam surface to translate rotary motion of said gear to oscillatory movement of said follower member in a substantially parallel plane, which in turn imparts said oscillation to said shearing members.
Claim 6
Dependent Claim
39 words
The shear of claim 4 wherein said follower member has an elongated opening therein providing said cam surface, said opening having its longitudinal axis substantially parallel to the direction of extension of said tooth formations of said tooth plate.
Claim 7
Dependent Claim
49 words
The shear of claim 5 wherein said cam element has a generally circular transverse cross sectional configuration, and wherein said opening has substantially rectilinear side margIns extending parallel to said longitudinal axis of said opening and spaced therefrom a distance substantially equal to the radius of said cam element.
Claim 8
Dependent Claim
56 words
The shear of claim 4 wherein said shearing members are substantially rectilinear and are attached to said cam follower member with a spacing therebetween substantially equal to the distance between said axes of pivotal mounting thereof in said shear, thereby disposing said shearing members in a substantially parallel relationship and constraining them to parallelism during oscillation.
Claim 9
Dependent Claim
90 words
The shear of claim 4 wherein said drive means is positioned adjacent the other end of said tooth plate, said cam follower member being positioned adjacent said upper surface of said tooth plate with said shearing members attached thereto adjacent their inner ends and with said gear being positioned above said follower member with said cam element thereof extending downwardly thereto, said motor being positioned with its drive shaft extending downwardly along an axis parallel to that of said gear and having affixed thereon a pinion in meshing engagement therewith.
Claim 10
Dependent Claim
51 words
The shear of claim 3 additionally including a housing enclosing said motor and battery, said tooth plate extending outwardly from one end of said housing and said housing having a handle portion extending from the other end thereof in a direction generally opposite to that in which said tooth plate extends.
Claim 11
Dependent Claim
218 words
In a shear, the combination comprising: a. a generally planar tooth plate having at one end thereof a multiplicity of tooth formations defining generally U-shaped cutting recesses therebetween; b. a plurality of shearing members each comprised of a blade carrier individually pivotally mounted on said tooth plate inwardly from said one end thereof and a relatively narrow and resiliently deformable independent blade element extending outwardly along the upper surface of said one end of said tooth plate and having cutting edges extending along both side margins of the outer end portion thereof, said blade carrier having means thereon adjacent the outer end disengageably mounting said independent blade element with the outer end portion of said blade element being resiliently biased against said surface of said tooth plate, said shearing members being oscillatable about the pivotal mounting of said blade carriers to oscillate said blade elements across the aligned cutting recesses with said cutting edges thereof wiping the side edges of the tooth formations defining said recess; and c. drive means for oscillating said shearing member upon said tooth plate, the bias of said blade elements tending to urge said outer end portions thereof through said cutting recesses and causing substantially point contact between said cutting edges and said side edges as said blade elements wipe said tooth formations.
Claim 12
Dependent Claim
218 words
In a shear, the combination comprising: a. a generally planar tooth plate having at one end thereof a multiplicity of tooth formations defining generally U-shaped cutting recesses therebetween; b. a plurality of shearing members each comprised of a blade carrier individually pivotally mounted on said tooth plate inwardly from said one end thereof and a relatively narrow and resiliently deformable independent blade element extending outwardly along the upper surface of said one end of said tooth plate and having cutting edges extending along both side margins of the outer end portion thereof, said blade carrier having means thereon adjacent the outer end disengageably mounting said independent blade element with the outer end portion of said blade element being resiliently biased against said surface of said tooth plate, said shearing members being oscillatable about the pivotal mounting of said blade carriers to oscillate said blade elements across the aligned cutting recesses with said cutting edges thereof wiping the side edges of the tooth formations defining said recess; and c. drive means for oscillating said shearing member upon said tooth plate, the bias of said blade elements tending to urge said outer end portions thereof through said cutting recesses and causing substantially point contact between said cutting edges and said side edges as said blade elements wipe said tooth formations.
Claim 13
Dependent Claim
54 words
The shear of claim 10 wherein said shearing members are mounted on said tooth plate to oscillate in a substantially parallel relationship to one another, and wherein the point of pivotal mounting for each of said shearing members is in substantial alignment with the axis of said one cutting recess across which it moves.
Claim 14
Dependent Claim
67 words
The shear of claim 10 wherein said blade carrier is elongated, and wherein both said carrier and said blade element are substantially rectilinear, said carrier being mounted upon said tooth plate with the axis thereof substantially parallel to said upper surface of said plate, said mounting means supporting said blade element at an angle to said carrier disposing said blade element downwardly therefrom toward said tooth plate.
Claim 15
Dependent Claim
45 words
The shear of claim 12 wherein said one end of said carrier has a slot extending therethrough, a tang portion adajcent one end of said independent blade element being inserted upwardly through said slot and retained therein to so engage and dispose said blade element.
Claim 16
Dependent Claim
81 words
The shear of claim 14 wherein said blade element is retained by a pin affixed on one of said carrier and said tang of sAid blade element, the other of said carrier and tang having said pin securely received in an aperture thereof dimensioned and configured therefor, said pin being disposed with its axis substantially perpendicular to the axis of said blade element and said bias of said shear member urging said pin into said aperture to prevent inadvertent disassembly thereof.
Claim 17
Dependent Claim
256 words
In a shear, the combination comprising: a. a generally planar tooth plate having at one end thereof a multiplicity of tooth formations defining generally U-shaped cutting recesses therebetween; b. a plurality of shearing members each having a relatively narrow and resiliently deformable blade element extending outwardly along the upper surface of said one end of said tooth plate and having cutting edges extending along both side margins of the outer end portion thereof, each of said shearing members being pivotally mounted in said shear inwardly from said one end of said tooth plate for movement across one of said cutting recesses, said outer end portion of said blade element thereof being resiliently biased against said surface of said tooth plate and being oscillatable across the aligned cutting recess with said cutting edges thereof wiping the side edges of the tooth formations defining said recess; c. a sole plate element extending the lower surface of said tooth plate substantially across said tooth plate adjacent the inner ends of said tooth formations thereof to space said tooth formations upwardly from surfaces over which the shear is operated and thereby prevent excessive wear and damage to said tooth formations due to contact therewith; and d. drive means for oscillating said shearing member upon said tooth plate, the bias of said shearing members tending to urge said outer end portions of said blade elements thereof through said cutting recesses and causing substantially point contact between said cutting edges and said side edges as said blade elements wipe said tooth formations.
Claim 18
Dependent Claim
256 words
In a shear, the combination comprising: a. a generally planar tooth plate having at one end thereof a multiplicity of tooth formations defining generally U-shaped cutting recesses therebetween; b. a plurality of shearing members each having a relatively narrow and resiliently deformable blade element extending outwardly along the upper surface of said one end of said tooth plate and having cutting edges extending along both side margins of the outer end portion thereof, each of said shearing members being pivotally mounted in said shear inwardly from said one end of said tooth plate for movement across one of said cutting recesses, said outer end portion of said blade element thereof being resiliently biased against said surface of said tooth plate and being oscillatable across the aligned cutting recess with said cutting edges thereof wiping the side edges of the tooth formations defining said recess; c. a sole plate element extending the lower surface of said tooth plate substantially across said tooth plate adjacent the inner ends of said tooth formations thereof to space said tooth formations upwardly from surfaces over which the shear is operated and thereby prevent excessive wear and damage to said tooth formations due to contact therewith; and d. drive means for oscillating said shearing member upon said tooth plate, the bias of said shearing members tending to urge said outer end portions of said blade elements thereof through said cutting recesses and causing substantially point contact between said cutting edges and said side edges as said blade elements wipe said tooth formations.
Claim 19
Dependent Claim
12 words
The shear of claim 15 wherein said shearing members are individually mounted.
Claim 20
Dependent Claim
52 words
The shear of claim 15 wherein said sole plate element underlies the inner end portions of the recesses between said tooth formations and provides web portions having edge surfaces extending transversely between said tooth formations, said web portions reducing the effective depth of said tooth formations and blade elements exposed for cutting
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |