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Joint

  • US 3,879,146 A
  • Filed: 01/13/1972
  • Issued: 04/22/1975
  • Est. Priority Date: 01/15/1971
  • Status: Expired due to Term
First Claim
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1. A joint having two arms pivotable about a common axis and lockable with respect to each other in at least one predetermined angular position comprising:

  • a locking member mounted on one arm for radial movement with respect to the joint axis;

    a peripheral edge on the second arm extending concentrically from the joint axis and having a plurality of notches formed on the edge;

    spring means biasing said locking member towards said peripheral edge, an unlocking lever pivoted about the joint axis relative to the joint arms and having a substantially eccentric control curve for engaging said locking member and rising above the peripheral edge of the second arm, wherein the control curve includes a lift portion which in the locked condition of the joint, faces one of the notches and increases eccentrically its center distance, and when above the periphral edge the control curve passes through a point of maximum center distance and then in a blocking portion remote from the notches in the locked condition of the joint, the center distance thereof decreasing to form a cam portion, the unlocking movement of said unlocking lever relative to the second joint arm being limited so that the blocking portion upon reaching the end position of the unlocking lever in its unlocking position faces the notches and crosses said peripheral edge radially outward in the region of the notches, one of the notches in said peripheral edge of the second arm being radially aligned with said locking member when in one end position of the joint, and having a rear flank bevelled for receiving the locking member during rotation of the second arm into the other end position of the joint so that during rotation, said locking member can slide on and out the rear flank, and means for frictionally connecting said unlocking lever to the second joint arm.

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