GB1573624A - Metal push-on fasteners - Google Patents
Metal push-on fasteners Download PDFInfo
- Publication number
- GB1573624A GB1573624A GB112276A GB112276A GB1573624A GB 1573624 A GB1573624 A GB 1573624A GB 112276 A GB112276 A GB 112276A GB 112276 A GB112276 A GB 112276A GB 1573624 A GB1573624 A GB 1573624A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fingers
- shank
- fastener
- stabilising
- aperture
- 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.)
- Expired
Links
- 239000002184 metal Substances 0.000 title claims description 12
- 230000003019 stabilising effect Effects 0.000 claims description 40
- 229910000639 Spring steel Inorganic materials 0.000 claims description 5
- 230000000717 retained effect Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000001154 acute effect Effects 0.000 description 2
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
- F16B21/10—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts
- F16B21/20—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts for bolts or shafts without holes, grooves, or notches for locking members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Description
(54) IMPROVEMENTS IN METAL PUSH-ON FASTENERS
(71) We, BAKER & FINNEMORE
LIMITED, a British Company of 199
Newhall Street, Birmingham B3 1SN do hereby declare the invention for which we pray that a patent may be granted to us and the method by which it is to be performed to be particularly described in and by the following statement:
This invention relates to sheet metal push-on fasteners for gripping smooth cylindrical shanks. "Shanks" is used to refer collectively to cylindrical surfaces such as spindles and shafts, and the shanks of studs and pins.In one example of the type of push-on fastener with which the present invention is concerned, the fastener is generally flat and made of spring steel and has continuous outer portion at the back of which is a bearing surface to engage an article to be retained and an inner portion having locking fingers extending radially inwards towards a circular aperture for receiving a cylindrical shank which the fingers are to grip, the locking fingers diverging forwards from the plane of the bearing surface and having arcuate tips which, when the fastener is pushed along the shank in the direction in which the locking fingers trail, slide over the surface but when pushed in the opposite direction grip the shank and resist relative movement.
Such push-on fasteners suffer from the disadvantage that on being fitted to a shank they can be left in an attitude in which the bearing surface at the back of the retainer is, in the example cited, oblique to the axis of the shank so making only point contact with the article.
Push-on fasteners of top hat shape are known which are better in this respect. These fit over the end of a shank and comprise a sleeve closed at one end and having an annular flange extending radially at the other.
Gripping fingers slit from the sleeve but remaining integral with the flange are inclined inwards at a small acute angle to the sleeve. The sleeve fairly closely surrounds the shank which is gripped by the fingers.
The flange forms a bearing surface to engage an article to be retained on the shank and is held substantially at right angles to the shank axis by the close fit of the sleeve and the small angle which the fingers make with the shank surface. Because of this small angle however the gripping fingers do not resist removal of the fastener from the shank as well as locking fingers of the flat fasteners which are at a much larger acute angle to the shank. The closed end of the top-hat fasteners prevents its use other than over the end of a shank unless the closed end is removed but this weakens the fastener excessively.
As a cover over the end of the shank a top hat fastener, because of its shape and the broken outline due to the pierced fingers, is less attractive in appearance than at flat fastener fitted with a domed cap.
The present invention consists in a sheet metal push-on fastener for gripping a smooth cylindrical shank, the fastener comprising an inner portion defining an aperture for receiving a cylindrical shank, and a continuous outer portion surrounding the inner portion, the inner portion comprising fingers all having their tips at the aperture, some of the fingers being locking fingers and others stabilising fingers interposed between the locking fingers, the locking fingers being inclined with respect to the axis of the aperture, and having arcuate edges at their tips, and the stabilising fingers having extended tips which are confined to the same side of the fastener as the locking fingers, the arrangement being such that, in use of the fastener, the fingers engage the cylindrical surface of a shank of predetermined size entered in the aperture and the locking fingers lie oblique to the said surface of the shank, and when the fastener is pushed along the shank in the direction in which the locking fingers trail their arcuate edges slide along the shank but when pushed in the opposite direction they grip the shank and resist relative movement, and the extended tips of the stabilising fingers embrace an axial extent of the shank so as to urge the fastener to remain in a predetermined attitude with respect to the axis of the shank, but such as not to resist relative movement when the fastener is pushed along the shank in said opposite direction.
The tips of the stabilising fingers may have any of a variety of forms shaped to engage stably an axially extensive portion of the shank but may conveniently be of tapering part-cylindrical shape. As they make contact with the shank over a length instead of in one transverse plane or the shank, the stabilising fingers co-operate to ensure that the fastener can be fitted to the shank in the required attitude. The locking fingers perform their normal function of securing the fastener on the shank.
The stabilising fingers are preferably spaced equi-angularly about the aperture and so are the locking fingers. The stabilising fingers may be alternated with the locking fingers. The fingers may be separated from one another by slits or by narrow slots. The closed ends of the slits or slots are preferably rounded to avoid incipient cracks. Slits may be rounded by terminating in circular holes pierced through the metal.
The accompanying drawings shown one form of fastener according to the invention.
In the drawings:
Figure 1 is a plan view of the fastener,
Figure 2 is a cross-section on line 2-2 of
Figure 1 and
Figure 3 is a cross-section on line 3-3 of
Figure 1.
The fastener is formed from spring steel sheet and has a continuous annular outer portion 3, with a peripheral flange 4, and an inner portion 5 divided into two locking finger 6 and two stabilising fingers 7 extending radially inwards towards an aperture 8 and separated by narrow slots 9 the closed ends of which are rounded. The two locking fingers 6 are diametrically opposite to one another and so are the two stabilising fingers 7 so that locking fingers and stabilising fingers alternate. The locking fingers 6 subtend a smaller angle at the centre of the aperture 8 than the stabilising fingers 7 and any grain of the spring steel runs parallel to the line 2-2.
The back of the outer portion 3 forms a bearing surface 10. The locking fingers 6 from their roots at the Junction between the inner and outer portion 3 and 5 are inclined forwards from the plane of the bearing surface and have arcuate tips. The main parts of the stabilising fingers 7 remain in the plane of the bearing surface 10 as far as the aperture 8 but have extended tips 11 bent forwards and of tapering part-cylindrical shape.
When, as indicated in Figure 2, the back of the fastener is over the end of a shank 12, the locking fingers 6 and stabilising fingers 7 yield to allow the shank to enter the aperture 8. The stabilising fingers 7 guide the fastener and keep its bearing surface at right angles to the shank axis. The locking fingers 6 resist withdrawal of the fastener in the opposite direction. The fastener may be fitted, as also indicated in Figure 2, with a domed cap 13 the free edge of which is closed over the back edge of the flange 4.
WHAT WE CLAIM IS:
1. A sheet metal push-on fastener for gripping a smooth cylindrical shank, the fastener comprising an inner portion defining an aperture for receiving a cylindrical shank, and a continuous outer portion surrounding the inner portion, the inner portion comprising fingers all having their tips at the aperture, some of the fingers being locking fingers and others stabilising fingers interposed between the locking fingers, the locking fingers being inclined with respect to the axis of the aperture, and having arcuate edges at their tips, and the stabilising fingers having extended tips which are confined to the same side of the fastener as the locking fingers, the arrangement being such that, in use of the fastener, the fingers engage the cylindrical surface of a shank of predetermined size entered in the aperture and the locking fingers lie oblique to the said surface of the shank, and when the fastener is pushed along the shank in the direction in which the locking fingers trail their arcuate edges slide along the shank but when pushed in the opposite direction they grip the shank and resist relative movement, and the extended tips of the stabilising fingers embrace an axial extent of the shank so as to urge the fastener to remain in a predetermined attitude with respect to the axis of the shank, but such as not to resist relative movement when the fastener is pushed along the shank in said opposite direction.
2. A sheet metal push-on fastener as claimed in claim 1 wherein the outer portion defines a planar bearing surface to engage an article to be retained on the shank and the fingers are arranged so that in use of the fastener the bearing surface is held at right angles to the axis of the shank.
3. A sheet metal push-on fastener as claimed in claim 2 wherein main portions of the stabilising fingers remain in the plane of the bearing surface as far as the aperture and the extended tip of each stabilising finger is at right angles to the main portions thereof.
4. A fastener as claimed in any preceding claim wherein the extended tips of the stabilising fingers are of tapering partcylindrical shape.
5. A fastener as claimed in any preceding claim having one opposed pair of locking
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
1. A sheet metal push-on fastener for gripping a smooth cylindrical shank, the fastener comprising an inner portion defining an aperture for receiving a cylindrical shank, and a continuous outer portion surrounding the inner portion, the inner portion comprising fingers all having their tips at the aperture, some of the fingers being locking fingers and others stabilising fingers interposed between the locking fingers, the locking fingers being inclined with respect to the axis of the aperture, and having arcuate edges at their tips, and the stabilising fingers having extended tips which are confined to the same side of the fastener as the locking fingers, the arrangement being such that, in use of the fastener, the fingers engage the cylindrical surface of a shank of predetermined size entered in the aperture and the locking fingers lie oblique to the said surface of the shank, and when the fastener is pushed along the shank in the direction in which the locking fingers trail their arcuate edges slide along the shank but when pushed in the opposite direction they grip the shank and resist relative movement, and the extended tips of the stabilising fingers embrace an axial extent of the shank so as to urge the fastener to remain in a predetermined attitude with respect to the axis of the shank, but such as not to resist relative movement when the fastener is pushed along the shank in said opposite direction.
2. A sheet metal push-on fastener as claimed in claim 1 wherein the outer portion defines a planar bearing surface to engage an article to be retained on the shank and the fingers are arranged so that in use of the fastener the bearing surface is held at right angles to the axis of the shank.
3. A sheet metal push-on fastener as claimed in claim 2 wherein main portions of the stabilising fingers remain in the plane of the bearing surface as far as the aperture and the extended tip of each stabilising finger is at right angles to the main portions thereof.
4. A fastener as claimed in any preceding claim wherein the extended tips of the stabilising fingers are of tapering partcylindrical shape.
5. A fastener as claimed in any preceding claim having one opposed pair of locking
fingers and one opposed pair of stabilising fingers.
6. A fastener as claimed in claim 5 wherein the locking fingers subtend a smaller angle at the centre of the aperture than the stabilising fingers.
7. A sheet metal push-on fastener for gripping smooth cylindrical shanks substantially as described herein with reference to and as illustrated by the accompanying drawings.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB112276A GB1573624A (en) | 1976-01-13 | 1976-01-13 | Metal push-on fasteners |
FR7605192A FR2338411A1 (en) | 1976-01-13 | 1976-02-25 | SHEET FIXING UNIT WITH PUSH-ENGAGEMENT |
IT2146376A IT1058656B (en) | 1976-01-13 | 1976-03-23 | IMPROVEMENTS TO THE METAALO FIXING DEVICES OF THE PUSH TYPE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB112276A GB1573624A (en) | 1976-01-13 | 1976-01-13 | Metal push-on fasteners |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1573624A true GB1573624A (en) | 1980-08-28 |
Family
ID=9716543
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB112276A Expired GB1573624A (en) | 1976-01-13 | 1976-01-13 | Metal push-on fasteners |
Country Status (3)
Country | Link |
---|---|
FR (1) | FR2338411A1 (en) |
GB (1) | GB1573624A (en) |
IT (1) | IT1058656B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19726041A1 (en) * | 1997-06-19 | 1998-12-24 | Springfix Befestigungstechnik | Mounting bracket |
DE4125203B4 (en) * | 1990-07-30 | 2010-03-18 | Papst Licensing Gmbh & Co. Kg | Axial securing for a rotor shaft of an electric motor |
EP2389013A1 (en) | 2010-05-20 | 2011-11-23 | Harman Becker Automotive Systems GmbH | Loudspeaker with interlocking magnet structure |
US20130323547A1 (en) * | 2012-05-25 | 2013-12-05 | Komatsulite Mfg. Co., Ltd. | Breaker, safety circuit with breaker and secondary battery with breaker |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8700144A (en) * | 1987-01-21 | 1988-08-16 | Volvo Car Bv | LOCKING AND PIN BRACKET FOR THE CONTINUOUS CHAIN OF A CONTINUOUSLY VARIABLE TRANSMISSION. |
DE4304274C1 (en) * | 1993-02-12 | 1994-03-17 | Sgf Gmbh & Co Kg | Flexible disc for drive train of motor vehicle - has support rings, each with ring disc with teeth locking into associated bush |
-
1976
- 1976-01-13 GB GB112276A patent/GB1573624A/en not_active Expired
- 1976-02-25 FR FR7605192A patent/FR2338411A1/en active Granted
- 1976-03-23 IT IT2146376A patent/IT1058656B/en active
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4125203B4 (en) * | 1990-07-30 | 2010-03-18 | Papst Licensing Gmbh & Co. Kg | Axial securing for a rotor shaft of an electric motor |
DE19726041A1 (en) * | 1997-06-19 | 1998-12-24 | Springfix Befestigungstechnik | Mounting bracket |
DE19726041C2 (en) * | 1997-06-19 | 2002-02-14 | Springfix Befestigungstechnik | Crab |
EP2389013A1 (en) | 2010-05-20 | 2011-11-23 | Harman Becker Automotive Systems GmbH | Loudspeaker with interlocking magnet structure |
WO2011144438A1 (en) | 2010-05-20 | 2011-11-24 | Harman Becker Automotive Systems Gmbh | Loudspeaker with interlocking magnet structure |
JP2013529440A (en) * | 2010-05-20 | 2013-07-18 | ハーマン・インターナショナル・インダストリーズ・リミテッド | Loudspeaker with articulated magnet structure |
US20130323547A1 (en) * | 2012-05-25 | 2013-12-05 | Komatsulite Mfg. Co., Ltd. | Breaker, safety circuit with breaker and secondary battery with breaker |
Also Published As
Publication number | Publication date |
---|---|
IT1058656B (en) | 1982-05-10 |
FR2338411A1 (en) | 1977-08-12 |
FR2338411B3 (en) | 1978-11-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19970106 |