Lawnmower blade

• US 5,233,820 A
• Filed: 12/18/1992
• Issued: 08/10/1993
• Est. Priority Date: 12/18/1992
• Status: Expired due to Fees

• Current Assignee: Carolyn J. Rhoades
• Original Assignee: Carolyn J. Rhoades
• Inventors: Willsie, Raymond W.
• Primary Examiner(s): NOVOSAD, STEPHEN
• Application Number:
  US07/992,549
• Time in Patent Office: 235 Days
• Field of Search: 56/295, 56/255, 56/13.4, 56/12.7, 56/DIG. 9, 56/DIG. 17, 56/DIG. 20
• US Class Current: 56/255
• CPC Class Codes: A01D 34/73 Cutting apparatus
• CPC Class Codes: Y10S 56/17 Cutter details
• CPC Class Codes: Y10S 56/20 Blades, reels and guards

Abstract

A lawnmower blade which is characterized by an elongated, flat blade bar having a slight twist and fitted with a blower element at each end, along with pivotally or rotatably-mounted cutter discs. Each blower element includes a base plate secured to the blade bar and terminating in an extending blower top plate having top plate serrations on the end thereof. In a first preferred embodiment a perforated cutter disc is secured to each end of the blade bar beneath the blower element by means of a shoulder bolt which extends through one of six perforations to facilitate pivotally and eccentrically mounting the perforated cutter discs to the blade bar. In a second preferred embodiment a two-piece cutter disc is rotatably mounted on each end of the blade bar through an enlarged center opening. The perforated cutter discs and the two-piece cutter discs are provided with double-edged blade teeth to facilitate reversible mounting of the perforated cutter discs and the two-piece cutter discs on the ends of the blade bar.

Claims

1. A lawnmower blade for mounting on a powered rotary lawnmower, comprising:

(a) an elongated blade bar mounted for rotary operation on the lawnmower;

(b) a circular cutter blade pivotally and rotatably secured to each end of said blade bar and a plurality of teeth provided on the periphery of said cutter blade for cutting grass and weeds; and

(c) a generally U-shaped grass blower secured to each end of said blade bar and shaped to extend above and at least partially over said cutter blade, respectively, for removing cut grass and weeds.

2. The lawnmower blade of claim 1 wherein said blade bar is twisted or warped.

3. The lawnmower blade of claim 1 wherein said grass blower further comprises a base plate secured to said blade bar and a top plate curving from said base plate into a position spaced from said base plate.

4. The lawnmower blade of claim 1 wherein:

(a) said blade bar is twisted or warped; and

(b) said grass blower further comprises a base plate secured to said blade bar and a top plate curving from said base plate into a position spaced from said base plate.

5. The lawnmower blade of claim 1 wherein said cutter blade is pivotally secured in off-center, eccentric relationship to said blade bar.

6. The lawnmower blade of claim 1 wherein:

(a) said blade bar is twisted or warped along the longitudinal axis thereof;

(b) said grass blower further comprises a base plate secured to said blade bar, a top plate curving from said base plate into a position spaced from said base plate and top plate serrations provided on said top plate for cutting the grass and weeds; and

(c) said cutter blade is pivotally secured in off-center, eccentric relationship to said blade bar.

7. The lawnmower blade of claim 1 wherein said cutter blade is rotatably secured substantially at the center thereof to said blade bar.

8. The lawnmower blade of claim 1 wherein:

(a) said blade bar is twisted or warped along the longitudinal axis thereof;

(b) said grass blower further comprises a base plate secured to said blade bar, a top plate curving from said base plate into a position spaced from said base plate and top plate serrations provided on said top plate for cutting the grass and weeds; and

(c) said cutter blade is rotatably secured substantially at the center thereof to said blade bar.

9. The lawnmower blade of claim 1 further comprising fastening means extending through said blade bar and said cutter blade for securing said cutter blade to said blade bar.

10. The lawnmower blade of claim 9 wherein:

(a) said blade bar warped along the longitudinal axis thereof; and

(b) said grass blower further comprises a base plate secured to said blade bar and a top plate curving from said base plate into a position spaced from said base plate.

11. The lawnmower blade of claim 10 wherein said cutter blade is pivotally secured in off-center, eccentric relationship to said blade bar.

12. The lawnmower blade of claim 10 wherein said cutter blade is rotatably secured substantially at the center thereof to said blade bar.

13. A lawnmower blade for mounting on the motor shaft of a powered lawnmower, comprising:

(a) an elongated, flat, warped blade bar secured to the motor shaft for rotary operation and a bar mount opening provided in each end of said blade bar;

(b) a pair of circular perforated cutter discs and a plurality of perforations arranged in circular fashion on said perforated cutter discs, with one of said perforations aligned with said bar mount opening on each end of said blade bar;

(c) a generally U-shaped grass blower provided on each end of said blade bar and a blower mount opening provided in said grass blower, said blower mount opening aligned with said one of said perforations in said perforated cutter discs and said bar mount opening in each end of said blade bar; and

(d) fastening means projecting through said bar mount opening, said one of said perforations and said blower mount opening for fixedly attaching said grass blower to said each end of said blade bar and attaching said perforated cutter discs to said each end of said blade bar in off-center, eccentrically pivotal relationship.

14. The lawnmower blade of claim 13 wherein said grass blower further comprises a base plate secured to said blade bar and a top plate curving from said base plate into a position spaced from said base plate.

15. The lawnmower blade of claim 13 wherein said fastening means comprises a shoulder bolt, a washer and a nut threaded on said shoulder bolt.

16. The lawnmower blade of claim 13 wherein:

(a) said grass blower further comprises a base plate secured to said blade bar and a top plate curving from said base plate into a position spaced from said base plate; and

(b) said fastening means comprises a shoulder bolt, a washer and a nut threaded on said shoulder bolt.

17. A lawnmower blade for mounting on the motor shaft of a powered lawnmower, comprising:

(a) an elongated, flat, warped blade bar secured to the motor shaft for rotary operation and a bar mount opening provided in each end of said blade bar;

(b) a pair of circular two-piece cutter discs and a mount disc opening provided in the center of said two-piece cutter discs, and said mount disc opening aligned with said bar mount opening on each end of said blade bar;

(c) a generally U-shaped grass blower provided on each end of said blade bar and a blower mount opening provided in said grass blower, said blower opening aligned with said mount disc opening in said two-piece cutter discs and said bar mount opening in each end of said blade bar; and

(d) fastening means projecting through said bar mount opening, said blower mount opening and said bar mount opening for fixedly attaching said grass blower to said each end of said blade bar and attaching said two-piece cutter disc to said each end of said blade bar in rotatable relationship.

18. The lawnmower blade of claim 17 wherein said grass blower further comprises a base plate secured to said blade bar and a top plate curving from said base plate into a position spaced from said base plate.

19. The lawnmower blade of claim 17 wherein said fastening means comprises a shoulder bolt, a washer and a nut threaded on said shoulder bolt.

20. The lawnmower blade of claim 17 wherein:

(a) said grass blower further comprises a base plate secured to said blade bar and a top plate curving from said base plate into a position spaced from said base plate; and

(b) said fastening means comprises a shoulder bolt, a washer and a nut threaded on said shoulder bolt.