Locking adjustable length rod assembly

An adjustable rod assembly comprising:

• a first tubular member defining a primary axis;
• a cam body secured to a first end of the first tubular member, the cam body defining an oval outer surface along a shaft portion, wherein a protrusion protrudes radially outward from the shaft portion and extends a first angular distance adjacent a minor dimension of the oval outer surface;
• a second tubular member having a first end sized to slide over the first tubular member and the cam body;
• a collar disposed about the oval outer surface of the cam body, the collar having an oval inner surface shaped to be concentric and nest with the oval shaft portion in an unlocked position and the collar having a window receiving the protrusion and extending a second angular distance greater than the first angular distance of the protrusion;
• and
• an elastomeric sleeve disposed about the collar,
• wherein a rotation of the cam body about the primary axis relative to the collar causes the oval outer surface to generate an outward force by the elastomeric sleeve against an inner surface of the second tubular member,
• wherein the protrusion moves within the groove as the first tubular member is rotated, and wherein the groove limits rotation of the first tubular member and thereby prevents over-rotation.

An adjustable rod assembly comprising:

• an elongate first tubular member;
• an elongate second tubular member adapted to longitudinally translate over the first tubular member to adjust an overall length of the adjustable rod assembly;
• a cam body affixed to an end of the first tubular member, the cam body includes a shaft portion defining an oval surface, wherein a protrusion protrudes radially outward from the shaft portion along a minor dimension of the oval surface and extends a first angular length;
• a collar defining an oval inner surface shaped to be concentric and nest with the oval surface in an unlocked position, and an outer surface defining a cylindrical shape, the collar having a groove forming a window between the inner surface and the outer surface of the collar, the window receiving the protrusion and extending a second angular length greater than the first angular length of the protrusion;
• and
• an elastomeric sleeve having a closed section and disposed about the collar,
• wherein rotation of the first tubular member causes rotation of the cam body relative to the collar and the protrusion moves within the groove to a locked position,
• wherein in the locked position, the collar is adapted to expand and the elastomeric sleeve is adapted to deform and generate an outward radial force upon an inner surface of the second tubular member thereby restricting longitudinal translation of the second tubular member relative to the first tubular member thereby fixing the overall length of the rod assembly,
• wherein the groove limits rotation of the first tubular member to the locked position and thereby prevents over-rotation.