Abstract: A cylindrical body houses a shaft and is movable with respect thereto. The body carries a first jaw element at one end thereof. A second jaw element is joined to fixed support means connected to the shaft within the body. A compression spring surrounds a portion of the shaft projecting from the opposite end of the body, and the spring urges the jaw elements into clamping relationship. The clamp is opened by moving the body in opposition to the force of the spring.

Abstract: An assembly for supporting a conventional bobbin having at least one metallic ring about its base. A pair of spaced plates define a first groove for receiving the ring on one side of the bobbin. A movable plate member is provided at its bottom portion with a second groove. The latter groove is defined by a flange on the plate member and an L-shaped member secured to the plate member. The plate member is spring biased towards the spaced plates whereby the bobbin ring is received within the second groove on the opposite side of the bobbin. The retention of the ring in the grooves prevents the bobbin from being lifted from the assembly.