US5123236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary mower blade with rake springs
Assignee: Individual
•
Filing: 1990-03-09
•
Granted: 1992-06-23
•
Expires: 2010-03-09
Abstract
Abstract A rotary lawn mower blade is provided with opposite end dependingly supported rake springs. Each of the springs comprises a closed coil spring body whose upper end is removably supported from the underside of the corresponding rotary mower blade end and the lower convolution of each coil spring body includes a downwardly directed vertical spring tine or finger. The mower blade incorporates a pair of elongated opposite end blade end sections including remote and adjacent ends with the adjacent ends thereof disposed in end overlapped engagement with each other and the adjacent ends include meshed projections and recesses spaced longitudinally therealong. The adjacent ends are longitudinally slotted and a threaded shank type fastener is passed upwardly through the slots and may be threaded in a blind bore formed in the lower end of the vertical engine shaft of a rotary mower.
Inventors
- 👤 Leo Bablitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:18
CPC Classifications
A; A01; A01D; A01D42/00; A01D42/02; A01D2101/00; Y; Y10; Y10S; Y10S56/00; Y10S56/09; Y10S56/17; Y10S56/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
143 words
In combination, an elongated rotary blade for mounting in horizontal position from the lower end of a powered vertical output shaft with said shaft disposed centrally intermediate the opposite ends of said blade, a pair of rake springs mounted from said blade ends, said rake springs including closed convolution coil spring bodies each having upper and lower ends, said upper ends including upwardly projecting, headed mounting shanks, said opposite ends including brackets mounted therebeneath defining elongated guideways extending longitudinally of said blade and including open and closed adjacent and remote ends, respectively, said heads being snugly and slidably received in said guideways, the lower convolution of each spring body including a substantially vertical downturned integral lower end portion extending downwardly from the periphery of the corresponding coil spring body and thus laterally offset relative to the center axis of said coil spring body.
Claim 2
Dependent Claim
143 words
In combination, an elongated rotary blade for mounting in horizontal position from the lower end of a powered vertical output shaft with said shaft disposed centrally intermediate the opposite ends of said blade, a pair of rake springs mounted from said blade ends, said rake springs including closed convolution coil spring bodies each having upper and lower ends, said upper ends including upwardly projecting, headed mounting shanks, said opposite ends including brackets mounted therebeneath defining elongated guideways extending longitudinally of said blade and including open and closed adjacent and remote ends, respectively, said heads being snugly and slidably received in said guideways, the lower convolution of each spring body including a substantially vertical downturned integral lower end portion extending downwardly from the periphery of the corresponding coil spring body and thus laterally offset relative to the center axis of said coil spring body.
Claim 3
Dependent Claim
17 words
The combination of claim 1 wherein said coil spring bodies each include at least four complete convolutions.
Claim 4
Dependent Claim
15 words
The combination of claim 2 wherein said coil spring bodies each include five complete convolutions.
Claim 5
Dependent Claim
83 words
The combination of claim 1 wherein said elongated blade member includes a pair of elongated opposite end blade sections including remote and adjacent ends, said adjacent ends being end overlapped with each other and including meshed projections and recesses spaced therealong, said adjacent ends being centrally longitudinally slotted, and threaded fastening means slidably and rotably received through the overlapped slotted adjacent ends of said end portions and adapted to be threadedly engaged within a threaded blind bore formed in said rotary output shaft.
Claim 6
Dependent Claim
52 words
The combination of claim 4 including a centrally apertured channel member in which said end overlapped adjacent ends are received and a centrally apertured plate overlying the uppermost overlapped adjacent end and received within said channel member, said threaded fastening means passing through the apertures formed in said channel member and plate.
Claim 7
Dependent Claim
42 words
The combination of claim 4 including a pair of relatively inverted and centrally apertured channel members embracingly engaged about said overlapped adjacent ends from above and below the latter, said threaded fastening means extending through the apertures formed in said channel members.
Claim 8
Dependent Claim
43 words
The combination of claim 4 including a pair of mirror image angle members embraced about said overlapped adjacent ends from above and below the latter, said angle members including registered apertures formed therethrough, said threaded fastening means also passing through said registered apertures.
Claim 9
Dependent Claim
147 words
An elongated rotary blade for mounting in horizontal position from the lower end of a powered vertical output shaft with said shaft disposed centrally intermediate the opposite ends of said blade, said blade including opposite end blade sections including remote and adjacent ends with said adjacent ends overlapped engaged with each other, said adjacent ends being centrally longitudinally slotted and equipped with meshed rack gear teeth spaced longitudinally along said blade, threaded fastening means passing through the slots of said overlapped adjacent ends and adapted to be threadedly engaged in a blind bore formed in said lower end of said vertical output shaft, said meshed rack gear teeth equipped and centrally slotted adjacent ends and said threaded fastening means passing through said slots coacting to enable said adjacent ends to be secured relative to each other in adjustably overlapped relation for varying the length of said blade.
Claim 10
Dependent Claim
147 words
An elongated rotary blade for mounting in horizontal position from the lower end of a powered vertical output shaft with said shaft disposed centrally intermediate the opposite ends of said blade, said blade including opposite end blade sections including remote and adjacent ends with said adjacent ends overlapped engaged with each other, said adjacent ends being centrally longitudinally slotted and equipped with meshed rack gear teeth spaced longitudinally along said blade, threaded fastening means passing through the slots of said overlapped adjacent ends and adapted to be threadedly engaged in a blind bore formed in said lower end of said vertical output shaft, said meshed rack gear teeth equipped and centrally slotted adjacent ends and said threaded fastening means passing through said slots coacting to enable said adjacent ends to be secured relative to each other in adjustably overlapped relation for varying the length of said blade.
Claim 11
Dependent Claim
52 words
The combination of claim 8 including a centrally apertured channel member in which said end overlapped adjacent ends are received and a centrally apertured plate overlying the uppermost overlapped adjacent end and received within said channel member, said threaded fastening means passing through the apertures formed in said channel member and plate.
Claim 12
Dependent Claim
139 words
An elongated rotary blade for mounting in horizontal position from the lower end of a powered vertical output shaft with said shaft disposed centrally intermediate the opposite ends of said blade, said blade including opposite end blade sections including remote and adjacent ends with said adjacent ends overlapped engaged with each other, said adjacent ends being centrally longitudinally slotted and provided with meshed projections and recesses spaced longitudinally along said blade, threaded fastening means passing through the slots of said overlapped adjacent ends and adapted to be threadedly engaged in a blind bore formed in said lower end of said vertical output shaft, a pair of relatively inverted and centrally apertured channel members embracingly engaged about said overlapped adjacent ends from above and below the latter, said threaded fastening means extending through the apertures formed in said channel members.
Claim 13
Dependent Claim
139 words
An elongated rotary blade for mounting in horizontal position from the lower end of a powered vertical output shaft with said shaft disposed centrally intermediate the opposite ends of said blade, said blade including opposite end blade sections including remote and adjacent ends with said adjacent ends overlapped engaged with each other, said adjacent ends being centrally longitudinally slotted and provided with meshed projections and recesses spaced longitudinally along said blade, threaded fastening means passing through the slots of said overlapped adjacent ends and adapted to be threadedly engaged in a blind bore formed in said lower end of said vertical output shaft, a pair of relatively inverted and centrally apertured channel members embracingly engaged about said overlapped adjacent ends from above and below the latter, said threaded fastening means extending through the apertures formed in said channel members.
Claim 14
Dependent Claim
140 words
An elongated rotary blade for mounting in horizontal position from the lower end of a powered vertical output shaft with said shaft disposed centrally intermediate the opposite ends of said blade, said blade including opposite end blade sections including remote and adjacent ends with said adjacent ends overlapped engaged with each other, said adjacent ends being centrally longitudinally slotted and provided with meshed projections and recesses spaced longitudinally along said blade, threaded fastening means passing through the slots of said overlapped adjacent ends and adapted to be threadedly engaged in a blind bore formed in said lower end of said vertical output shaft, a pair of mirror image angle members embraced about said overlapped adjacent ends from above and below the latter, said angle members including registered apertures formed therethrough, said threaded fastening means also passing through said registered apertures.
Claim 15
Dependent Claim
140 words
An elongated rotary blade for mounting in horizontal position from the lower end of a powered vertical output shaft with said shaft disposed centrally intermediate the opposite ends of said blade, said blade including opposite end blade sections including remote and adjacent ends with said adjacent ends overlapped engaged with each other, said adjacent ends being centrally longitudinally slotted and provided with meshed projections and recesses spaced longitudinally along said blade, threaded fastening means passing through the slots of said overlapped adjacent ends and adapted to be threadedly engaged in a blind bore formed in said lower end of said vertical output shaft, a pair of mirror image angle members embraced about said overlapped adjacent ends from above and below the latter, said angle members including registered apertures formed therethrough, said threaded fastening means also passing through said registered apertures.
References Cited (Backward Citations)
US2795916A
Cited
US3109274A
Cited
US3511036A
Cited
US3753338A
Cited
US3753341A
Cited
US3857226A
Cited
US3964243A
Cited
US4374465A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-23 | 1995-12-23 | 1996-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-23 | 1999-12-23 | 2000-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-23 | 2003-12-23 | 2004-06-23 | $7700.00 | Window Closed / Lapsed |