Patent ID: 11882788
Assignee: AGCO INTERNATIONAL GMBH
Field: Other special machines (Mechanical engineering)
Classification: CPC A  F | IPC A  F

Claim 0:
1. A mowing sickle drive system comprising:
a knife bar supported by a frame;
a drive apparatus operable to drive the knife bar in a reciprocating linear motion at a variable drive frequency;
at least one gas spring coupled to the knife bar and configured to apply a restoring force to the knife bar toward a neutral position when the knife bar is in motion, wherein the at least one gas spring comprises a gas chamber; and
a flow control valve in communication with the gas chamber, wherein the flow control valve is configured to control a flow of air in to, and out of, the gas chamber to control a modulus of elasticity of the at least one gas spring such the modulus of elasticity is dependent upon the drive frequency.