# US 5,702,197 A · Structure of pivot joint

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- Number: US 5,702,197 A
- Document ID: US5702197A
- Status: Granted
- Kind: A
- Application number: 08/673,090
- Filed: 1996-07-01
- Granted: 1997-12-30
- Earliest claimed: 1996-07-01
- Assignees: Chih Ching Industry Ltd.
- Inventors: Guei-Rung Chen
- Web page: https://patentgrep.com/patent/US5702197A

## CPC

- G06F 1/1616: {with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position}
- G06F 1/1681: {Details related solely to hinges (hinge details related to the transmission of signals or power are classified in G06F1/1683)}
- E05D 11/087: {with substantially axial friction, e.g. friction disks}
- E05Y 2999/00: Subject-matter not otherwise provided for in this subclass
- Y10T 403/32262: At selected angle
- Y10T 403/32319: including pivot stud
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- E05D: HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS (pivotal connections in general F16C11/00)
- E05Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A pivot joint including a pivot bolt, which has an elongated flat mounting rod section at one end, a screw rod section at an opposite end, which has two longitudinal planes at two opposite sides, and a collar between in the middle, a mounting frame rotatable about the screw rod section, a lock nut in threaded engagement with the screw rod section, a first packing ring mounted around the screw rod section between the mounting frame and the collar, a second packing ring mounted around the screw rod section between the mounting frame and the lock nut, a locating ring mounted around the screw rod section between the second packing ring and the lock nut and rotatable by the pivot bolt relative to the mounting frame, reversed sets of disk-like spring rings mounted around the screw rod section between the locating ring and the lock nut, and a washer mounted around the screw rod section between the spring rings and the lock nut, wherein the second packing ring has a curved flange abutting the locating ring so that the second packing ring and the locating ring are connected through a line contact.

## Claims

### Claim 1

A pivot joint comprising a pivot bolt having an elongated flat mounting rod section at one end, a screw rod section at an opposite end, said screw rod section having two longitudinal planes at two opposite sides, and a collar between said fiat mounting rod section and said screw rod section, a mounting frame rotatable about said screw rod section, a lock nut in threaded engagement with said screw rod section, a first packing ring mounted around said screw rod section and disposed between said collar and said mounting frame, a second packing ring mounted around said screw rod section and disposed between said mounting frame and said lock nut, a locating ring mounted around said screw rod section and disposed between said second packing ring and said lock nut and rotatable by said pivot bolt relative to said mounting frame, a plurality of spring members mounted around said screw rod section and disposed between said locating ring and said lock nut, and a washer mounted around said screw rod section and disposed between said spring members and said lock nut, said second packing ring having a curved flange at one side abutting said locating ring, said locating ring having a rectangular through hole engaged with said longitudinal planes of said screw rod section.

### Claim 2 (depends on 1)

The pivot joint of claim 1 wherein said second packing ring and said locating ring are connected through a line contact.

### Claim 3 (depends on 1)

The pivot joint of claim 1 wherein said spring members include reversed sets of disk-like ring plates mounted around said screw rod section and disposed between said locating ring and said lock nut.

### Claim 4 (depends on 1)

The pivot joint of claim 1 wherein said first packing ring has a curved flange at one side abutting said mounting frame.