US PATENT SUBCLASS 213 / 22
.~ Combined spring and friction

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

7  DF  CUSHIONED {9}
22.~ Combined spring and friction {8}
23  DF  .~.~> Preliminary spring {1}
25  DF  .~.~> Springs only on draft
26  DF  .~.~> Differential spring compression {1}
28  DF  .~.~> Rotating friction elements
29  DF  .~.~> Interengaging friction springs {1}
31  DF  .~.~> Friction casings {1}
35  DF  .~.~> Central friction post {1}
37  DF  .~.~> Transversely movable friction element {1}

DEFINITION

Classification: 213/22

(under subclass 7) Devices using the combined action of springs and friction as means for cushioning movement of the draft devices.

SEE OR SEARCH CLASS

267, Spring Devices,

196+, for spring and friction retarder devices specifically disclosed as having utility other than as a railway draft appliance and in which no claim sets forth a spring device limited to use as railway draft appliance.