AU723760B2 - Friction hinge with retention finger - Google Patents
Friction hinge with retention finger Download PDFInfo
- Publication number
- AU723760B2 AU723760B2 AU69619/98A AU6961998A AU723760B2 AU 723760 B2 AU723760 B2 AU 723760B2 AU 69619/98 A AU69619/98 A AU 69619/98A AU 6961998 A AU6961998 A AU 6961998A AU 723760 B2 AU723760 B2 AU 723760B2
- Authority
- AU
- Australia
- Prior art keywords
- finger
- shaft
- band
- undercut
- hinge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
- E05D11/00—Additional features or accessories of hinges
- E05D11/08—Friction devices between relatively-movable hinge parts
- E05D11/082—Friction devices between relatively-movable hinge parts with substantially radial friction, e.g. cylindrical friction surfaces
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pivots And Pivotal Connections (AREA)
- Hinges (AREA)
Description
WO 98/49418 PCT/US98/07145 FRICTION HINGE WITH RETENTION FINGER BACKGROUND OF THE INVENTION Simple friction hinges can be made with only two parts, a band fit tightly about a shaft. However, in many instances in which hinges are used to connect parts rotatably together, there are axial forces acting on the hinges. Absent some features to insure axial positioning, the band and the shaft of the friction hinge(s) may tend to come apart or be jammed together, causing a failure. In these cases, it is necessary to assure that the band and the shaft remain in the proper axial alignment with respect to one another. Two lockrings are often used to solve this problem. A flanges on the shaft, together with a single lock-ring or heading of the shaft after assembly are also used. These prior art solutions to this problem involve extra operations and/or extra parts, all of which add cost and complexity to the manufacturing of the friction hinge.
SUMMARY OF THE INVENTION Our invention provides a very simple method for axially positioning the band with respect to the shaft. It requires a single undercut in the shaft, and two slots or other simply achieved cuts in the band. No extra parts are required, and no extra steps are needed in assembly.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a projection view of the assembled friction hinge of our invention; FIG. 2 is an exploded projection view of the two component parts of our invention; FIG. 3 is a projection view of an alternate embodiment of the band of our invention; and FIG. 4 is a projection view of a third embodiment of the band of our inventive friction hinge.
WO 98/49418 PCT/US98/07145 -2- DETAILED DESCRIPTION OF THE DRAWINGS The friction hinge of FIGS. 1 and 2 have only two parts, shaft 1 and band 3. Band 3 has a portion 5 that is essentially circular, and flange portion 7 for attachment. Shaft 1 has flattened portion 9 for mounting, and cylindrical portion 11 for receiving circular portion 5 of band 3.
Circular portion 5 is formed with a diameter slightly smaller than the outside diameter of shaft 1.
Therefore, band 3 must be expanded slightly in order to fit over shaft 1. This produces a moment in circular portion 5 of band 3, and the grip of circular portion on cylindrical portion 11 of shaft 1 produces the desired friction.
The band of our invention is cut from flat material.
During the cutting operation, two slits 13 are cut into the band, forming finger 15 therebetween. When circular portion 5 of the band is formed into an essentially circular shape, finger 15 is formed into that shape along with the rest of the band material.
Shaft 1 has undercut 17 in cylindrical portion 11 positioned and sized to receive finger 15. Since circular portion 5 of band 3 is formed to a diameter somewhat smaller than the outside diameter of cylindrical portion 11 of shaft 1, when the two parts are assembled and finger 15 is positioned over undercut 17, the stored moment in finger 15 causes it to move into undercut 17.
Finger 15 should fit loosely into undercut 17, and undercut 17 should, desirably, be deep enough so that finger 15 does not contact the bottom of the undercut so as to minimize any spurious effects on the frictional torque of the hinge.
The axial retention force for this embodiment of our invention depends on the amount of interference between the band and the shaft. That is, the amount by which the band must be expanded to fit over the shaft. It also WO 98/49418 PCT/US98/07145 -3depends on the diameter used, and the thickness and elastic properties of the band material, and on the arcuate length of slits 13. The width, in the axial direction, of slits 13 is not important. But it is important to remove some material to prevent rubbing contact between the finger and the band portions adjacent to the slits.
Experience has shown that sufficient axial retention can be achieved for many friction hinge applications by means of the above embodiment. However, a second embodiment of our invention provides greater axial retention capability than that provided by the above embodiment. FIG. 3 depicts the band of this embodiment.
Band 19, of this second embodiment, is of the same general configuration as band 3 of the previous embodiment. In fact, band 19 can be cut from sheet material with the same tool used to cut band 3. The only difference between the two bands is in the tool used to form the circular portion of the bands. Band 3 is formed to a uniform, essentially circular shape, whereas for band 19, finger 21 is formed to a smaller diameter than the two circular portions 23. This requires somewhat more complex forming tooling or operations. But once tooled, the manufacturing expense is no greater.
When band 19 is assembled onto a shaft like shaft 1, there will be more engagement between finger 21 and the undercut in the shaft than in the first embodiment. This produces greater axial retention capability.
Care should be taken to ensure that the shaft undercut is deep enough to accommodate the finger.
Still another embodiment of the band of our inventive friction hinge is shown in FIG. 4. Axial retention by a single finger protruding into an undercut in the shaft may fail in the presence of large forces in the axial direction. As the shaft turns within the band in the direction in which the band is wrapped about the -4shaft, axial forces bring the edges of the undercut against an edge of the finger as it enters the undercut tending to raise the finger out of the undercut. If the forces and the rotation persist, the finger may be lifted out of the undercut and onto the large diameter of the shaft. Band 25 of FIG. 4 overcomes this problem by means of having two fingers, one facing in each direction within the same shaft undercut.
Finger 27 faces in the same direction as the fingers of the previous embodiments, and finger 29 faces the opposite direction. The use of a finger facing in each direction tends to prevent the lifting out of the finger under large axial loads for one direction of rotation.
Throughout the specification, unless the context requires otherwise, the word "comprise" or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers.
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Claims (8)
1. A friction hinge comprising: a shaft and a substantially circular radially expandable band frictionally wrapped thereabout; said band defined by a first portion leading to one end and a second portion leading to the other opposite end with said first portion formed with a pair of slits extending from its respective end such that said first portion comprises a pair of substantially circularly radially expandable outside members and a substantially circular inside finger disposed between said slits and attached to said second portion; said outside members and said finger having substantially the same circular diameter when said outside members are not in a condition of radial expansion; said shaft having an annular undercut aligned with said finger; said outside members and said finger having a circular diameter slightly smaller than that of said shaft such that said outside members radially expand to frictionally grip said shaft while said finger is received in said undercut.
2. The hinge of claim 1, wherein said finger, after assembly, fits loosely in said 'annular undercut formed in said shaft.
3. The hinge of claim 1, wherein said annular undercut formed in said shaft has a bottom and said finger does not substantially contact said bottom when matingly received in said undercut.
4. A friction hinge comprising: a shaft and a substantially circular radially expandable band frictionally wrapped thereabout; said band having a flange portion and a substantially circular finger extending from said flange portion and coaxial with said band; a said band and said finger having substantially the same circular diameter -6- when said band is not in a condition of radial expansion; said shaft having an annular undercut aligned with said finger; said band having a circular diameter slightly smaller than that of said shaft such that said band radially expands to frictionally grip said shaft while said finger is received by said undercut.
The hinge of claim 1, wherein said finger, after assembly, fits loosely in said annular undercut formed in said shaft.
6. The hinge of claim 4, wherein said annular undercut formed in said shaft has a bottom, and said finger does not substantially contact said bottom when matingly received in said undercut.
7. The hinge of claim 4, wherein said band is formed with at least one annular slit for defining said finger.
8. A friction hinge substantially as herein described with reference to the accompanying drawings. %*too 6 .64 *o oooo
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US4494597P | 1997-04-25 | 1997-04-25 | |
US60/044945 | 1997-04-25 | ||
US09/002764 | 1998-01-06 | ||
US09/002,764 US5943738A (en) | 1998-01-06 | 1998-01-06 | Friction hinge with retention finger |
PCT/US1998/007145 WO1998049418A1 (en) | 1997-04-25 | 1998-04-08 | Friction hinge with retention finger |
Publications (2)
Publication Number | Publication Date |
---|---|
AU6961998A AU6961998A (en) | 1998-11-24 |
AU723760B2 true AU723760B2 (en) | 2000-09-07 |
Family
ID=26670836
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU69619/98A Ceased AU723760B2 (en) | 1997-04-25 | 1998-04-08 | Friction hinge with retention finger |
Country Status (4)
Country | Link |
---|---|
AU (1) | AU723760B2 (en) |
CA (1) | CA2287185C (en) |
GB (1) | GB2338985B (en) |
WO (1) | WO1998049418A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5251949A (en) * | 1992-08-18 | 1993-10-12 | Plasta Fiber Industries, Inc. | Visor mounting system |
US5406678A (en) * | 1993-07-22 | 1995-04-18 | General Clutch Corporation | Friction hinge |
US5666695A (en) * | 1993-11-19 | 1997-09-16 | Federal-Hoffman, Inc. | Hinge system |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1728433A (en) * | 1924-07-21 | 1929-09-17 | John L Mohun | Journal box |
-
1998
- 1998-04-08 WO PCT/US1998/007145 patent/WO1998049418A1/en active IP Right Grant
- 1998-04-08 AU AU69619/98A patent/AU723760B2/en not_active Ceased
- 1998-04-08 GB GB9925050A patent/GB2338985B/en not_active Expired - Fee Related
- 1998-04-08 CA CA002287185A patent/CA2287185C/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5251949A (en) * | 1992-08-18 | 1993-10-12 | Plasta Fiber Industries, Inc. | Visor mounting system |
US5406678A (en) * | 1993-07-22 | 1995-04-18 | General Clutch Corporation | Friction hinge |
US5666695A (en) * | 1993-11-19 | 1997-09-16 | Federal-Hoffman, Inc. | Hinge system |
Also Published As
Publication number | Publication date |
---|---|
AU6961998A (en) | 1998-11-24 |
GB2338985B (en) | 2000-11-29 |
WO1998049418A1 (en) | 1998-11-05 |
CA2287185C (en) | 2002-04-16 |
CA2287185A1 (en) | 1998-11-05 |
GB9925050D0 (en) | 1999-12-22 |
GB2338985A (en) | 2000-01-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MK6 | Application lapsed section 142(2)(f)/reg. 8.3(3) - pct applic. not entering national phase | ||
NB | Applications allowed - extensions of time section 223(2) |
Free format text: THE TIME IN WHICH TO ENTER THE NATIONAL PHASE HAS BEEN EXTENDED TO 5 JAN 2000. |
|
FGA | Letters patent sealed or granted (standard patent) | ||
MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |