Disclosed is a device for securing and adjusting a bearing in an orifice in a bridge or a plate of a timepiece. It includes a first bearing screw defining a crimping opening of such a bearing and including an external thread, a second screw, so-called locking screw, defining an internal bore and including an external thread and a socket defining a tubular housing extending following a longitudinal axis, the tubular housing including a first tapped section, adapted to screw the first screw, and a second tapped section, adapted to screw the second screw. Advantageously, the external threads of the first and second screws and the corresponding sections of the socket have respective screwing pitches in opposite directions. Also disclosed is a method for securing and adjusting a bearing in an orifice provided for that purpose in a bridge or a plate of a timepiece thanks to such a device.

The disclosure belongs to the field of general technology of device, and relates to a connection structure of a bolt and a nut having dumbbell-like shaped symmetrical bidirectional tapered thread, which solves the problem of poor self-positioning and self-locking of existing threads. An internal thread (6) is a bidirectional tapered hole (41) (non-entity space) on an inner surface of a cylindrical body (2), an external thread (9) is a bidirectional tapered cone body (71) (material entity) on an outer surface of a columnar body (3), and a complete unit thread is a helical dumbbell-like shaped symmetrical bidirectional tapered body small in the middle and large in both ends and having a left taper (95) same as and/or approximately same as a right taper (96).

A connection structure of a bolt and a nut of a thread outlining a symmetrically bidirectional tapered olive-like shape, an internal thread (6) on the inner surface of a columnar body (2) outlining a bidirectional tapered hole (41), an external thread (9) on the outer surface of a cylindrical body (3) outlining a bidirectional truncated cone body (71), and each complete threaded body unit forming a bidirectional tapered body in an olive-like shape (93) having a large middle part and two small ends, the left conical degree (95) and the right conical degree (96) being same and/or approximately same, solving the problems of poor self-positioning and self-locking of existing threads, etc. The performance mainly depends on the tapered face and conical degrees of the threaded body.

An assembly for a coupling together rotatable components according to an example of the present disclosure includes, among other things, a rotor shaft extending along a centerline axis, the rotor shaft defining an inner bore extending from an axial end of the rotor shaft, a gear mounted on an outer diameter of the rotor shaft, a lock nut threadedly engaged with the outer diameter of the rotor shaft such that the lock nut abuts against an axial end face of the gear, and a retainer including a step portion extending from a head portion and including a projection portion extending from the step portion. The projection portion is insertable into the inner bore to bias the lock nut against the axial end face of the gear, and the step portion is dimensioned to establish an interference fit with the rotor shaft along the inner bore. A starter assembly and a method of assembly are also disclosed.

An assembly for a coupling together rotatable components according to an example of the present disclosure includes, among other things, a rotor shaft extending along a centerline axis, the rotor shaft defining an inner bore extending from an axial end of the rotor shaft, a gear mounted on an outer diameter of the rotor shaft, a lock nut threadedly engaged with the outer diameter of the rotor shaft such that the lock nut abuts against an axial end face of the gear, and a retainer including a step portion extending from a head portion and including a projection portion extending from the step portion. The projection portion is insertable into the inner bore to bias the lock nut against the axial end face of the gear, and the step portion is dimensioned to establish an interference fit with the rotor shaft along the inner bore. A starter assembly and a method of assembly are also disclosed.

An anti-loosening fastener, including a key-bolt-receiving bolt, including a head section to receive at least one tool thereon, a rear cylindrical section disposed on at least a portion of the head section to extend a predetermined distance away from the head section, the rear cylindrical section including a key-bolt-receiving aperture disposed within at least a portion of the rear cylindrical section to receive an external fastener therein, and an internal thread section circumferentially disposed on an inner surface within the key-bolt-receiving aperture, and a key bolt to removably connect to at least a portion of the key-bolt-receiving bolt.

An anti-loosening fastener, including a key-bolt-receiving bolt, including a head section to receive at least one tool thereon, a rear cylindrical section disposed on at least a portion of the head section to extend a predetermined distance away from the head section, the rear cylindrical section including a key-bolt-receiving aperture disposed within at least a portion of the rear cylindrical section to receive an external fastener therein, and an internal thread section circumferentially disposed on an inner surface within the key-bolt-receiving aperture, and a key bolt to removably connect to at least a portion of the key-bolt-receiving bolt.

A threaded installation is provided. The threaded installation includes a nut, a bolt, and a housing. The housing includes a threaded hole. A first threaded connection is formed where the bolt is threadably coupled with the nut, and a second threaded connection is formed where the bolt is threadably coupled with the threaded hole. The first threaded connection is characterized by a first flank angle, .sub.2A, of threads of the bolt or threads of the nut. The second threaded connection is characterized by a second flank angle, .sub.3B, of threads of the bolt or threads of the housing. The flank angles, .sub.2A and .sub.3B, satisfy the following equation:

[00001]$k_2=\frac{\cos \left({}_{2.Math.A}\right)}{\cos \left({}_{3.Math.B}\right)}>1.0.Math.0.$

One aspect is an apparatus including an additively manufactured first component and a captive nut contained within the first component for interconnecting the first component to a second component. Another aspect is an apparatus including a first additively manufactured component having a hole and a second additively manufactured component having a socket. The apparatus further includes a pin having a head engaging a surface of the first component and a shaft extending from the head through the hole in the first component and into the socket of the second component. Another aspect is an apparatus including first and second panels. The apparatus also includes a bolt having a head and a shaft extending from the head and a nut located at a distal end of the shaft. The first and seconds panels may be sandwiched between the bolt and nut to interconnect the first and second panels.

The present invention relates to a unit (10) for a locking device, including: a nut (12) comprising first (18) and second (20) coaxial taps in opposite directions; and a ring (13); said ring including a third tap (38); the first (18) and third (38) taps being capable of engaging with a single first thread (22); said ring including a second thread (40) capable of engaging with the second tap (20) of the nut. A portion (33) of the ring, projecting relative to the second thread (40), includes a through-hole (60); and a surface (16) of the nut includes a visual marking, configured to be opposite the hole (60) when the nut and the ring are in an installation position, and separated from said hole when the nut and the ring are outside said installation position.