Pivot shaft

• US 5,022,778 A
• Filed: 11/02/1990
• Issued: 06/11/1991
• Est. Priority Date: 11/02/1990
• Status: Expired due to Term

• Current Assignee: Sheng N. Lu
• Original Assignee: Sheng N. Lu
• Inventors: Lu, Sheng N.
• Primary Examiner(s): KUNDRAT, ANDREW
• Application Number:
  US07/608,264
• Time in Patent Office: 221 Days
• Field of Search: 403/120, 403/146, 403/147
• US Class Current: 403/120
• CPC Class Codes: E05D 11/081 with both radial and axial friction, e.g. conical friction surfaces
• CPC Class Codes: E05F 1/1215 with a canted-coil torsion spring
• CPC Class Codes: E05F 1/1223 with a compression or traction spring
• CPC Class Codes: E05Y 2201/21 Brakes
• CPC Class Codes: E05Y 2201/25 Mechanical means for force or torque adjustment therefor
• CPC Class Codes: E05Y 2999/00 Subject-matter not otherwise provided for in this subclass
• CPC Class Codes: F16C 11/103 frictionally clamped
• CPC Class Codes: F16M 11/10 around a horizontal axis F16M11/12 takes precedence
• CPC Class Codes: F16M 2200/022 by friction
• CPC Class Codes: F16M 2200/041 for balancing rotational movement of the head
• CPC Class Codes: G06F 1/1681 Details related solely to hinges hinge details related to the transmission of signals or power are classified in G06F1/1683
• CPC Class Codes: Y10T 403/32614 including circumferential biasing or damping means
• CPC Class Codes: Y10T 403/32827 Interposed spring means coaxial with pivot
• CPC Class Codes: Y10T 403/32836 Acting through tapered surface on bearing component

Abstract

A pivot shaft constructed with a holder having a base and a vertical mount for a sleeve with a pair of diametrically opposed notches to lock into, above the base is a spring, a washer, and a nut. The spring has one end inserted into a hole of the base and another blockaded by a outer edge of a washer. A shaft consisting of a head, a cylinder, and a threaded portion locks into the sleeve, the vertical mount, the spring, and the washer by engaging with the nut.

Claims

1. A pivot shaft comprising:

a holder having a base and a vertical mount, said base having two pairs of side holes and a pair of joint holes, said vertical mount having a shaft hole;

a sleeve having a first pair of diametrically opposed notches fitted into said shaft hole of said vertical mount, and providing an inner tapered portion for a shaft to pass therethrough and be rotatable therein;

said shaft constructed with a head, a cylinder, and a threaded portion which are integral, said head having a second pair of diametrically opposed notches, and a tapered portion provided between said head and said cylinder engaging with said inner tapered portion of said sleeve, said tapered portion on the shaft having a peripheral groove with a pair of channels disposed perpendicular thereto, said cylinder having a third pair of diametrically opposed notches near a boundary of said cylinder and said threaded portion engaging with a washer;

a spring provided about said shaft between said vertical mount and said washer, and a first end of said spring inserted into one of said joint holes and a second end of said spring abutting an outer edge on said washer;

said washer having said outer edge to block said second end of said spring and an opening for said threaded portion of said shaft to pass therethrough, said third pair of diametrically opposed notches of said cylinder engaging with said opening; and

a nut having an inner washer for said threaded portion to pass therethrough and fasten therein.