US4003436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillatory cultivator
Assignee: Black and Decker Corp
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Filing: 1973-08-15
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Granted: 1977-01-18
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Expires: 1993-08-15
Abstract
Abstract A portable, power operated, hand cultivator comprising a frame having a motor supported thereon which, through a transmission, oscillates two or more generally vertically disposed cultivator tines extending downwardly from the frame. A handle is provided for easy control and manipulation of the device.
Inventors
- 👤 Philip C. Foster
- 👤 Bert E. Forsman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:48
CPC Classifications
A; A01; A01B; A01B33/00; A01B33/06; A01B1/00; A01B1/06; A01B1/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
A portable, power operated cultivator comprising a frame, a motor mounted on said frame substantially centrally of its width, said motor having a vertically disposed, rotatable output shaft, a pair of cultivator tines suspended from said frame for oscillation about generally vertical axes, one on either side of said motor, gear train means interconnecting said motor output shaft and said oscillating tines, said gear train means including a pair of oppositely rotating gear elements, each of said gear elements including a drive means eccentrically disposed relative to the axis of said gear element, a pair of means each including a connecting rod engaged with one of said eccentric drive means and also connected to a respective one of said cultivator tines, said connecting rods being substantially symmetrical with respect to a midplane of said frame and operating substantially in opposite directions to one another, whereby the forces developed by said cultivator are substantially equal and opposite to one another thereby cancelling each other and minimizing vibrational forces arising therein.
Claim 2
Dependent Claim
169 words
A portable, power operated cultivator comprising a frame, a motor mounted on said frame substantially centrally of its width, said motor having a vertically disposed, rotatable output shaft, a pair of cultivator tines suspended from said frame for oscillation about generally vertical axes, one on either side of said motor, gear train means interconnecting said motor output shaft and said oscillating tines, said gear train means including a pair of oppositely rotating gear elements, each of said gear elements including a drive means eccentrically disposed relative to the axis of said gear element, a pair of means each including a connecting rod engaged with one of said eccentric drive means and also connected to a respective one of said cultivator tines, said connecting rods being substantially symmetrical with respect to a midplane of said frame and operating substantially in opposite directions to one another, whereby the forces developed by said cultivator are substantially equal and opposite to one another thereby cancelling each other and minimizing vibrational forces arising therein.
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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |