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US 5,961,109 AGranted
Amplified hold-down clamp
AssigneeDelaware Capital Formation, Inc.
InventorsHenry Dykstra, Douglas D. Colby
Life of this patent
Estimating the term…
Abstract
The clamp is a locked over-center toggle clamp having a toggle lever that actuates a clamp arm between clamped and released positions. An amplification lever is secured to a cam pivot for rotation of the cam pivot inside a base. One end of the clamp arm is pivoted to the cam pivot to act as a follower so that rotation of the cam pivot cams the clamp arm to amplify the hold-down force of the toggle clamp.
Claims28
An amplified hold-down toggle clamp comprising:
- a toggle means for actuating a clamp arm between clamped and released positions, said clamp arm including one end pivoted to a base;
- a toggle lever having one end pivoted to said base;
- a link member pivotally connecting said clamp arm to said toggle lever for locked-over-center cooperation in said clamped position;
- a cam pivot rotatable held in said base and providing the pivotal connection of said clamp arm to said base, said cam pivot including a cam portion having a cam surface on which the end of said clamp arm pivots and acts as a follower of the cam surface;
- and
- a rotating means to rotate said cam pivot in said base.
3 more elements
An amplified hold-down toggle clamp comprising:
- a base;
- a toggle lever pivotally connected to said base establishing a first pivotal axis;
- a clamp arm actuated by said toggle lever between clamped and released positions, one end of said clamp arm having an orifice;
- a link member pivotally connected to said toggle lever establishing a second pivotal axis with the opposite end of said link member pivotally connected to said clamp arm establishing a third pivotal axis;
- a hold-down means pivotally connected to the end of said clamp arm opposite said orifice;
- a cam pivot rotatably held in said base, said cam pivot having a cam portion to receive said clamp arm at the orifice;
- and
- said cam portion has a portion extending laterally to receive an amplification lever for rotating said cam pivot.
5 more elements
An amplified hold-down toggle clamp comprising:
- a base;
- a toggle lever pivotally connected to said base establishing a first pivotal axis;
- a clamp arm actuated by said toggle lever between clamped and released positions, one end of said clamp arm having an orifice;
- a link member pivotally connected to said toggle lever establishing a second pivotal axis with the opposite end of said link member pivotally connected to said clamp arm establishing a third pivotal axis;
- a hold-down means pivotally connected to the end of said clamp arm opposite said orifice;
- and
- a cam pivot rotatably held in said base, said cam pivot has two cylindrical portions extending laterally from one another, one a pivot portion rotatably held in said toggle means and the second a cam portion to receive said clamp arm at the orifice, the two portions are nonconcentric having a section of exterior surfaces congruent with the cam portion having a smaller diameter of the two portions.
4 more elements
An amplified hold-down toggle clamp apparatus comprising:
- toggle linkage members which actuate a clamp arm from an open position to an initially closed position having an initial clamping force, said toggle linkage members having first, second, and third pivotal axes associated therewith,
- a cam pivot member rotatably held in a base, said cam pivot member having a cam portion with said clamp arm having one portion thereof in contact with said cap portion to act as a follower for significantly increasing the clamping force of said toggle means in its clamped position over and above said initial clamping force, and
- a rotation means to rotate said cam pivot in said base to provide the camming action on said clamp arm by said cam portion.
An amplified hold-down toggle clamp apparatus comprising:
- toggle linkage members which actuate a clamp arm from an open position to an initially closed position having an initial clamping force, said toggle linkage members having first, second, and third pivotal axes associated therewith,
- a cam pivot member rotatably held in said toggle means, said cam pivot member having a cam portion with said clamp arm having one portion thereof in contact with said cam portion to act as a follower for significantly increasing the clamping force of said toggle means in its clamped position over and above said initial clamping force;
- said initially clamped position is a locked over-center position established by the toggle lever rotating about the first pivotal axis until the third pivotal axis is located on the one side of a plane established by the first and second pivotal axes to establish the initial clamping force;
- said cam pivot has a portion extending laterally to receive an amplification lever for rotating said cam pivot.
1 more element
An amplified hold-down toggle clamp apparatus comprising:
- toggle linkage members which actuate a clamp arm from an open position to an initially closed position having an initial clamping force, said toggle linkage members having first, second, and third pivotal axes associated therewith,
- a cam pivot member rotatable held in said toggle means, said cam pivot member having a cam portion with said clamp arm having one portion thereof in contact with said cam portion to act as a follower for significantly increasing the clamping force of said toggle means in its clamped position over and above said initial clamping force;
- said initially clamped position is a locked over-center position established by the toggle lever rotating about the first pivotal axis until the third pivotal axis is located on the one side of a plane established by the first and second pivotal axes to establish the initial clamping force,
- said cam pivot has a portion extending laterally to receive an amplification lever for rotating said cam pivot,
- said amplification lever having an orifice to receive said lateral extension from said pivot.
2 more elements
Dependencies are inferred from the claim text.