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US 4,687,229 AGranted
Spring actuated clamp
AssigneeR. E. P. Industries Inc.
InventorRichard E. Penniman
Life of this patent
Estimating the term…
Abstract
A clamp for a posting board having a clamp arm and hinge which provides the desired clamping force to retain papers on the board, as desired, and also providing a continuous opening force when rotated beyond a fulcrum position defined by a pivoting extension tab of the hinge and a cantilevered leaf spring.
Claims10
An apparatus comprising:
- a posting board;
- means defining a hinge provided along an edge of said board, said hinge means having a first knuckle means fixedly attached to said posting board and a second knuckle means including a lifter arm and an extension tab, said first and second knuckle means alternately engaging and rotationally pivoting about a hinge pin;
- a flexible member cantilevered from the edge of said board;
- a clamp arm attached to said lifter arm rotatable to a closed position in contact with said posting board, said extension tab contacting said member such that said clamp arm is biased toward said board when in said closed position, and said clamp arm being rotatable to an open position, said extension tab contacting said member to continually bias said clamp arm away from said board in said open position.
1 more element
A clamp comprising:
- hinge means having a hinge pin and first and second sets of alternately engaging knuckles pivoting about said hinge pin;
- a leaf spring cantilevered from a fixed reference surface having a lateral edge;
- a tab attached to said first set of knuckles, said tab slideably contacting said leaf spring;
- a clamp arm attached to and rotating with said first set of knuckles, said clamp arm being baised towards said fixed reference surface when said tab contacts said spring on one side of a fulcrum and said clamp being biased away from said fixed reference surface when said tab contacts said spring on the opposite side of said fulcrum.
1 more element
A clamp comprising:
- hinge means having a hinge pin and first and second sets of alternately engaging knuckles pivoting about said hinge pin;
- a body comprising a fixed reference surface having a lateral edge;
- a leaf spring cantilevered from said lateral edge;
- a tab attached to said first set of knuckles, and in contact with said leaf spring and said second set of knuckles being secured to said reference surface;
- and
- a clamp attached to and rotating with said first set of knuckles, and which upon rotation thereof causes sliding contact between said tab and leaf spring so as to produce a reaction force which upon closure of the clamp towards the reference surface acts on movement of said tab past said fulcrum point to maintain the clamp in a closed position and which upon opening of the clamp acts to maintain the clamp in the open position upon movement of said tab past said fulcrum point.
3 more elements
Dependencies are inferred from the claim text.