Abstract: A coupling device for two flanged shaft ends is disclosed. A tapered pin bolt having a conical shank is employed within a complementary, internally tapered expansion sleeve having longitudinal slit. The pin bolt and sleeve extend through aligned bores provided in the flanges. The pin bolt is externally threaded on its opposite ends extending from the conical shank. A nut having an internal, axially extending and pin arrangement is mounted over each respective end of the pin bolt.

Abstract: Coupling of two flanged shafts end-to-end by means of taper pin bolts and expansion sleeves cooperating with the pin bolts and having the same conicity, said sleeves extending into bores provided in said flanges and said pin bolts having external threads on both ends, a first end being located on the small side of the taper cone and a second end on the large side of the cone, is accomplished by:(a) inserting each pin bolt together with its sleeve into the corresponding bores,(b) screwing a nut onto the first end of the pin,(c) exerting a tractive force on the second end by means of a cylinder, the nut of the first end bearing against the corresponding flange,(d) while maintaining the tractive force on the second end, applying a nut against the second corresponding flange by screwing the nut up on the second end of the pin bolt,(e) and pushing back the sleeve toward said second end and cancelling the action of the cylinder.

Abstract: This device comprises a groove (6) made in the internal wall of a through hole (2) of the case (1) giving passage to the stem (3) of the winding crown (4). A gasket (8) is placed in the groove (6). The internal diameter of the gasket (8) is less than the outside diameter of the stem (3) of the winding crown and is thus compacted between the stem (3) and the groove (6). The stem (3) is comprised by an internally screw-threaded pedestal (3') secured to the winding crown (4) and an externally screw-threaded winding stem (3") screwed into the pedestal (3'). As a result, the hole (2) can be made of relatively small diameter, which is an important advantage in an extra-thin watch whose case is of relatively soft precious metal, because the tendency to bend the case, that would be present in the case of a large hole, is overcome.