Injection molded knife guards

Details Injection molded knife guards Injection molded knife guards

1991-03-13

1993-05-11

Bui, Thuy M.

Harvesters

Cutting

Cutter members

56307, A01D 5500

Patent

active

052090531

ABSTRACT:
Conventionally, knife guards for reciprocating cutter knives used on cutter-bar type implements are made from cast iron, forged steel, carbon steel, spring steel, malleable iron or steel or high grade alloy steel. Knife guards made of metal are not impact resistant, are not resilient and have a high level of friction between the guard and the cutter bar knives reciprocating therein which not only causes heavy wear to occur but also needs additional power to operate. The present device is injection molded from plastic and in particular, a polyimide resin such as glass filled, super tough nylon or a polyacetal based plastic resin with petroleum based lubricant bonded therewithin and can be formed in one, two or three prong configurations with or without ledger plates.

REFERENCES:
patent: 2730858 (1956-01-01), Steiner
patent: 3525203 (1970-08-01), Claas et al.
patent: 3553948 (1971-01-01), White
patent: 3844095 (1974-10-01), Steuerwald
patent: 4553380 (1985-11-01), O'Halloran
patent: 4660361 (1987-04-01), Remillard et al.

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