ROTARY CUTTER HEAD ASSEMBLY FOR LAWN MOWERS

• US 3,621,642 A
• Filed: 10/09/1970
• Issued: 11/23/1971
• Est. Priority Date: 10/09/1970
• Status: Expired due to Term

• Current Assignee: N/A
• Original Assignee: N/A
• Time in Patent Office: 410 Days
• US Class Current: 56/295
• CPC Class Codes: A01D 34/736 Flail type

Abstract

A ROTARY CUTTER HEAD ASSEMBLY FOR LAWN MOWERS IN WHICH A GENERALLY FLAT DISK IS PROVIDED WITH AN INTEGRAL DOWNWARDLY SLOPING ANNULAR RING. A PAIR OF CROSSED BARS ARE ARRANGED PERPENDICULARLY TO EACH OTHER AND EXTEND RADIALLY OUTWARDLY TO THE OUTER EDGE OF THE DISK. THE BARS HAVE DOWNWARDLY SLOPING OUTER END PORTIONS CONTACTING THE DOWNWARDLY SLOPING ANNULAR RING ON THE DISK. A DOWNWARDLY SLOPING ANNULAR RING HAVING A DIAMETER THE SAME AS THE DOWNWARDLY SLOPING ANNULAR RING FORMED ON THE DISK IS ARRANGED IN SPACED PARALLEL RELATION THERETO CONTACTING THE UPPER FACES OF THE BARS. THE TWO ANNULAR DISKS ARE SECURED TOGETHER WITH RIVETS PASSING THROUGH THE ENDS OF THE BARS. UPSTANDING AIR IMPELLER MEMBERS ARE SECURED TO THE UPPER SURFACE OF THE ANNULAR DISK. A PLURALITY OF CUTTER BLADES ARE PIVOTALLY MOUNTED BETWEEN THE ANNJLAR RINGS FOR MOVEMENT TO A POSITION BETWEEN THE ANNULAR RINGS WHEN STRIKING AN UNYIELDING OBJECT. CENTRIFUGAL FORCE NORMALLY HOLDS THE CUTTER BLADES IN EXTENDED POSITION AGAINST A STOP PROVIDED A LIMIT THE MOVEMENT OF THE CUTTER BLADES OUTWARDLY WHILE THE BARS ARE POSITIONED TO SERVE AS A STOP TO LIMIT THE MOVEMENT OF THE BLADES INWARDLY.

Claims