Abstract: A signal distributor includes a main body, a screw and a clamp attached to the screw. The main body has a ground outlet formed with a threaded hole, an orifice laterally extending through the threaded hole, and a pair of grooves axially and diametrically defined in an inner periphery of the threaded hole. The screw has a head, a threaded shank engagable with the threaded hole and a flanged neck formed between the head and the threaded shank. The clamp has a strip deformable to be held in the flanged neck, two extensions extending downwardly from an under face of the strip and movable in the groove, and a contact connected to distal ends of the extensions. The contact defines a substantially V-shaped slot in an under face thereof to engage a ground wire to be held in the orifice.

Abstract: An auto resistance device for distribution boxes, which can automatically provide grounding for a cable connector of a distribution box before a cable is connected or remove the grounding after the cable is connected is disclosed.

Abstract: An improved radio-wave insulating device for a high frequency signal distributor, comprising a cover 2a and a case body 3a. The case body 3a is provided with a plurality of protuberances 32a which slightly outsizes the corresponding notches 22a of the cover 2a. Thus when the cover 2a is mounted in place in the case body 3a, a force, which results from the deformation of the protuberances 32a in the notches 22a, is provided parallel to the corresponding side of the cover, thus ensuring a firm engagement between the cover and the case body, without causing the bulging-out of the case body.