Lawn mower blade mounting
First Claim
1. A lawn mower comprising a blade housing, a member adapted for rotation within said blade housing and having a peripheral edge, a blade movably secured to said member for movement between a retracted position wherein said blade is positioned inwardly of said peripheral edge, and an extended position wherein said blade extends outwardly beyond said peripheral edge, and means for biasing said blade to said retracted position in the absence of rotation of said member above a predetermined speed.
2 Assignments
0 Petitions
Accused Products
Abstract
Disclosed herein is a lawn mower comprising a blade housing, a member adapted for rotation within the blade housing and having a peripheral edge, a blade movably secured to the member for movement between a retracted position wherein the blade is positioned inwardly of the peripheral edge, and an extended position wherein the blade extends outwardly beyond the peripheral edge, and a spring for biasing the blade to the retracted position in the absence of rotation of the member above a predetermined speed.
32 Citations
24 Claims
- 1. A lawn mower comprising a blade housing, a member adapted for rotation within said blade housing and having a peripheral edge, a blade movably secured to said member for movement between a retracted position wherein said blade is positioned inwardly of said peripheral edge, and an extended position wherein said blade extends outwardly beyond said peripheral edge, and means for biasing said blade to said retracted position in the absence of rotation of said member above a predetermined speed.
- 11. A lawn mower comprising a blade housing, a generally disc-shaped member adapted for rotation within said blade housing, said member having a peripheral edge and also having a pair of interior channels each having an oppositely directed opening extending transversely through said peripheral edge, a pair of blades each having an end portion including a cutter edge, said blades being respectively movably secured within said interior channels for movement between a retracted position wherein said blades are positioned inwardly of said peripheral edge, and an extended position wherein said cutting edges of said blades extend outwardly through said channel openings beyond said peripheral edge, and means for biasing said blades so as to resist centrifugal force exerted on said blades, said bias means biasing said blades to said retracted position in the absence of rotation of said member above a predetermined speed, said bias means affording movement of said blades to said extended position when said member rotates above the predetermined speed.
- 15. A blade mounting adapted for use with a lawn mower having a blade housing, said mounting comprising a member adapted for rotation within the blade housing and having a peripheral edge, a blade movably secured to said member for movement between a retracted position wherein said blade is positioned inwardly of said peripheral edge, and an extended position wherein said blade extends outwardly beyond said peripheral edge, and means for biasing said blade to said retracted position in the absence of rotation of said member above a predetermined speed.
- 22. A blade mounting adapted for use with a lawn mower having a blade housing, said mounting comprising a generally disc-shaped member adapted for rotation within the blade housing, said member having a peripheral edge, and also having a pair of interior channels each having an oppositely directed opening extending transversely through said peripheral edge, a pair of blades each having an end portion including a cutting edge, said blades being respectively movably secured within said interior channels for movement between a retracted position wherein said blades are positioned inwardly of said peripheral edge, and an extended position wherein said cutting edges of said blades extend outwardly through said channel openings beyond said peripheral edge, and means for biasing said blades so as to resist centrifugal force exerted on said blades, said bias means biasing said blades to said retracted position in the absence of rotation of said member above a predetermined speed, said bias means affording movement of said blades to said extended position when said member rotates above the predetermined speed.
Specification