US PATENT SUBCLASS 213 / 41
.~.~ Varying resistance

Current as of: June, 1999
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213 /   HD   RAILWAY DRAFT APPLIANCES

7  DF  CUSHIONED {9}
40 R  DF  .~ Springs {6}
41.~.~ Varying resistance

DEFINITION

Classification: 213/41

(under subclass 40) Devices wherein the spring resistance is increased to give greater resistance to movement of the draft device per unit of travel according to the amount of travel of the draft device or to provide a greater resistance to impact shock than to pulling strains.