US PATENT SUBCLASS 5 / 164.1
.~.~ Counterbalance spring

Current as of: June, 1999
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5 /   HD   BEDS

131  DF  BEDSTEADS {6}
133  DF  .~ Upending {18}
164.1.~.~ Counterbalance spring {1}
165  DF  .~.~.~> Tension bottom

DEFINITION

Classification: 5/164.1

Counterbalance spring:

(under subclass 133) Device comprising spring biasing means associated with an upendable section which counteracts a portion of the section's weight and assists or cushions the upending operation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

56, for assisting springs for sofa beds.