Pivot hinge

Details Pivot hinge Pivot hinge

2002-06-03

2003-12-02

Knight, Anthony (Department: 3676)

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Hinge

Including means to hold or retard hinged members against...

C016S338000

Reexamination Certificate

active

06654985

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pivot hinge, and more particularly to a pivot hinge having a first stem and a second stem. The first stem has an extension provided with a slit defined through the extension. The second stem has a hollow sleeve with an arcuate cutout peripherally defined in the sleeve. A screw is able to extend into the extension to enlarge the diameter of the extension in the sleeve after the extension is received in the hollow sleeve so as to adjust friction between the extension and the sleeve.
2. Description of Related Art
A conventional pivot hinge is composed of a bracket and a stem with a threaded end. The bracket has multiple washers provided on opposite sides of the bracket, a lubrication disk located outside the washer, multiple springs provided outside the lubrication disk, a positioning disk and a nut.
When the pivot hinge of this kind is to be assembled, the threaded end of the stem extends through the washers on one side of the bracket and the washers on the other side of the bracket, the lubrication disk, the springs, the positioning disk and into the nut to be screwingly connected to the nut. It is noted from the structure that when the stem pivots relative to the bracket, the friction required comes from the engagement between the bracket and the washers. Because the washers are completely in engagement with the bracket, the friction therebetween will gradually wear the washers, which leads to a short life span of the pivot hinge. Furthermore, due to the wear of the washers, the tightness off the engagement between the bracket and the washers becomes loose and therefore the friction is not enough when required.
To overcome the shortcomings, the present invention tends to provide an improved pivot hinge to mitigate and obviate the aforementioned problems.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide an improved pivot hinge which is able to adjust the friction between the sleeve and the extension so that the friction between the extension and the sleeve is maintained.
In order to accomplish the foregoing objective, the pivot hinge of the present invention has a first stem with an extension and a second stem with a hollow sleeve and an arcuate cutout peripherally defined in the hollow sleeve. A slit is defined to divide the extension to two symmetric halves. A threaded hole is defined in either one of the two halves of the extension to allow the extension of a screw such that after the extension is received in the hollow sleeve, the screw extends into the threaded hole from the arcuate cutout and abuts an inner periphery of the extension. Screwing the screw in the extension will then enlarge the diameter of the extension so as to increase the engagement tightness between the extension and the sleeve as well as the friction therebetween.


REFERENCES:
patent: 4428094 (1984-01-01), Emain
patent: 4490884 (1985-01-01), Vickers
patent: 5409122 (1995-04-01), Lazarus
patent: 5503491 (1996-04-01), Lu
patent: 5632066 (1997-05-01), Huong
patent: 5642957 (1997-07-01), Lange
patent: 5774939 (1998-07-01), Lu
patent: 6116806 (2000-09-01), Chang
patent: 6317927 (2001-11-01), Lai et al.
patent: 6473938 (2002-11-01), Yoshigashima et al.

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