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US 4,361,938 AGranted
Jamming cleat
OwnerHoward Emeryinventor
Life of this patent
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OwnerHoward Emeryinventor
Estimating the term…
A jamming cleat has a groove to receive and grip a rope. At least a part of the depth of the groove has facing side walls each of which is formed with a plurality of ridges. The edges are inclined upwardly from the base of the groove towards one end of the groove, and the crests of the ridges on each side of the groove lie generally in one common ridge crest plane. The ridge crest planes converge downwardly towards the bottom of the groove and diverge lengthwise of the groove away from the said one end of the groove. In use a rope or cord is laid in the groove and pulled through the groove in a direction away from the said one end of the groove. The ridges draw the rope down towards the bottom of the groove so as to jam the rope in the groove. The extent to which the rope is drawn down into the groove increases progressively away from the said one end but the rope is gripped generally uniformly along the length of the groove because of the divergence of the ridge crest planes.
A jamming cleat having a stationary groove to receive and grip a rope, at least a part of the depth of the groove having correspondingly stationary facing side walls each of which is formed with a plurality of ridges which are inclined upwardly from the base of the groove towards one end of the groove, the crests of the ridges on each side of the groove lying generally in one common correspondingly stationary ridge crest plane, which corresponding stationary ridge crest planes converge downwardly towards the bottom of the groove, wherein the said stationary ridge crest planes diverge at a fixed angle lengthwise of the groove away from the said one end of the groove to thereby more uniformly grip a rope extending lengthwise within the groove and downwardly from the said one end of the groove.
A unitary and integral jamming cleat having a stationary groove to receive and grip a rope, at least a part of the depth of the groove having correspondingly stationary facing side walls each of which is formed with a plurality of edges lying generally parallel and inclined upwardly from the base of the groove towards one end of the groove, the crests of the ridges on each side of the groove lying approximately in one common correspondingly stationary ridge crest plane, which corresponding stationary ridge crest planes converge downwardly towards the bottom of the groove at an angle within the range of 5 degrees to 40 degrees, wherein the said stationary ridge crest planes diverge lengthwise of the groove away from the said one end of the groove to form a fixed angle within the range of 1 degree to 4 degrees, whereby a rope laid lengthwise through the groove and pulled in a direction away from the said one end of the groove so as to be drawn downwardly towards the base of the groove by the ridges and jammed within the groove, will be drawn down progessively further into the groove from the said one end of the groove towards the other end of the groove but will be substantially uniformly gripped by the ridges along the length of the groove by virtue of the divergence of the said ridge crest planes.
Dependencies are inferred from the claim text.