CA1121624A - Removable stud retaining fastener - Google Patents
Removable stud retaining fastenerInfo
- Publication number
- CA1121624A CA1121624A CA000337175A CA337175A CA1121624A CA 1121624 A CA1121624 A CA 1121624A CA 000337175 A CA000337175 A CA 000337175A CA 337175 A CA337175 A CA 337175A CA 1121624 A CA1121624 A CA 1121624A
- Authority
- CA
- Canada
- Prior art keywords
- fastener
- edge
- stud
- aperture
- generally
- 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
- 230000000717 retained effect Effects 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 3
- 230000002844 continuous effect Effects 0.000 claims 1
- 238000004080 punching Methods 0.000 description 9
- 238000005336 cracking Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/325—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by abutting or pinching, i.e. without alloying process; mechanical auxiliary parts therefor
- H05K3/326—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by abutting or pinching, i.e. without alloying process; mechanical auxiliary parts therefor the printed circuit having integral resilient or deformable parts, e.g. tabs or parts of flexible circuits
-
- 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
- F16B9/00—Connections of rods or tubular parts to flat surfaces at an angle
- F16B9/05—Connections of rods or tubular parts to flat surfaces at an angle by way of an intermediate member
- F16B9/056—Connections of rods or tubular parts to flat surfaces at an angle by way of an intermediate member the intermediate member extending through the flat surface; the rod or tubular part extending through the flat surface
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0364—Conductor shape
- H05K2201/0367—Metallic bump or raised conductor not used as solder bump
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/1031—Surface mounted metallic connector elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10431—Details of mounted components
- H05K2201/1059—Connections made by press-fit insertion
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/306—Lead-in-hole components, e.g. affixing or retention before soldering, spacing means
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/4092—Integral conductive tabs, i.e. conductive parts partly detached from the substrate
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Insertion Pins And Rivets (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A removable, one-piece, stud retaining fastener (10) having a continuous stud retaining aperture (16) comprising a relatively smooth edge (32) and a rel-atively rough edge (34) wherein the stud retaining edge (22) of the aperture (16) is the relatively smooth edge (32). A tab (21) is provided which may be gripped by a tool and pulled to split the fastener (10) to quickly and easily remove the fastener (10) from a retained stud.
A removable, one-piece, stud retaining fastener (10) having a continuous stud retaining aperture (16) comprising a relatively smooth edge (32) and a rel-atively rough edge (34) wherein the stud retaining edge (22) of the aperture (16) is the relatively smooth edge (32). A tab (21) is provided which may be gripped by a tool and pulled to split the fastener (10) to quickly and easily remove the fastener (10) from a retained stud.
Description
This invention relates to removable, one-piece, stamped sheet metal, push-on stud retainers and in particular relates to relatively thin walled, one-piece, stamped sheet metal, removable push-on stud retainers 5 having minimal transverse dimensions and utilizing the relatively smooth continuous edge of a punched or pierced hole as the stud retaining edge of the stud retaining aperture and having a tab which may be gripped and then pulled to ~lit the fastener for selective removal of the 10 fastener from a retained stud.
Description of the Prior Art One-piece, stamped sheet metal, thin walled stud retaining fasteners of the push-on type are well known in the prior art. Examples of such prior art devices may be 15 seen by reference to United ~tates Patent Nos. 1,675,277, issued June 26, 1928; 2,975,667, issued March 21, 1961;
Description of the Prior Art One-piece, stamped sheet metal, thin walled stud retaining fasteners of the push-on type are well known in the prior art. Examples of such prior art devices may be 15 seen by reference to United ~tates Patent Nos. 1,675,277, issued June 26, 1928; 2,975,667, issued March 21, 1961;
2,986,060, issued May 30, 1961; 3,032,807, issued May 8, 1962; and 3,108,371, issued November 29, 1963. Many of the prior art devices were formed by punching or piercing an 20 aperture into a sheet metal blank and then slotting or slitting the edges of the punched aperture to provide a stud retaining aperture having a plurality of stud retain-ing fingers. Other prior art devices were formed by punching or piercing a hole into a sheet metal blank from 25 a first direction and then forming a generally dome shaped impression from the other direction to achieve a fastener having a generally frusto-conical cross-sectional shape.
The forming of the generally dome shaped impression from Z-~
the direction opposite the direction of the punching of the hole assured that the "burr edge" of the punched hole was the stud retaining edge of the stud retaining aper-ture. The above mentioned ~nited States Patent No.
5 3,108,371, at Column 4, lines 37 to 51, is an example of such a so-called "reverse formed" stud retaining fastener.
Other prior art devices utilized a swaging operation to assure that the stud retaining edge of the stud retaining aperture was given a rough, biting surface. The prior art 10 stud retaining fasteners operated by frictionally gripping the exterior side walls of a retained stud. Such prior art devices usually resisted undesired removal of a retained stud by bitingly penetrating the outer edge of said studs and were not easily removed. While such prior art stud 15 retaining fasteners were generally suitable for most applications, the present tendency to use such fasteners in so-called miniature and/or microminiature devices has led to an attempt to minimize the outer transverse dimensions of said fasteners. Reduction of the transverse 20 dimension of such fasteners will allow the retention of studs on closer centerlines. Prior attempts to minimize the other transverse dimensions have been relatively un-successful as the prior art push-on fasteners have utilized a stud retaining aperture having a rough biting edge or 25 burred edge and/or a slotted or slitted edge to provide the stud engaging edge of such fasteners. The use of such burred edge and/or slitted edge has prevented attempts to minimize the outer dimensions of said prior art fasteners as the burred and/or slitted edges contained many cracks, 30 discontinuations, stress concentrations and/or irregular-ities therein which has resulted in premature cracking and/or other failure of the fastener body unless at least a predetermined minimal outer dimension thereof was provided.
11~16Z4 According to the present invention therc Ls prov-lded fl one-lLcce, stamped shect metnl, removable stu(l retainLng fastener including a body having a generally continuous, generally centrally located stud retaining aperture and a generally continuous, generally dome shaped impression generally coaxial with the aperture. The aperture defines a stud retaining edge, the aperture being formed from a pierced hole having a relatively smooth continuous and a burred edge. The stud retaining edge being formed from the relatively smooth continuous edge of the pierced hole. A
tab extends from the body.
In accordance with the present invention, many of the drawbacks of the prior art devices have been overcome by the provision of the improved, removable, one-piece, thin walled, stamped sheet metal push-on stud retaining fastener having a minimized outer transverse dimension.
The above is accomplished by utilizing the relatively smooth continuous edge of a hole punched or pierced in the sheet metal blank rather than the burred edge of the hole punched in the sheet metal blank as the stud retaining edge of the stud retaining aperture of the fastener. Applicant has discovered that when the dome shaped impression is formed in the sheet metal blank after the hole is punched therein from the same direction as the direction from which the hole was punched, the relatively smooth edge of the punched hole is compressingly formed into a strong, sharp, relatively uninterrupted, continuous edge. Such a strong, sharp, continuous edge is considerably more resistant to cracking and/or other failure than is a burred edge or a slitted edge mb/~ 3 : `
~ . . . .
z~
and thus redllces the re~lllLremellt for mLIterlnl at tile transverse exl:relnit-~es oE ~lle ~astener body to prevellt cracking or other fni]ure thereof. The tab, extending from either the outer periphery o~ the Eastener or Erom the edge of tlle stlld retainin8 aperture, is provided which mav be gripped by a tool and then pulled to split and separate the body oE the fastener for selective removal of the fastener from a retained stud.
Accordingly, it is an object of the present invention to provide an improved, removable, push-on stud retaining fastener of the thin walled type.
It is a further object of the present invention to provide an improved, removable, one-piece, stamped sheet metal, push-on, stud retaining fastener of the thin walled type wherein the outer transverse dimensions of said fastener are minimized.
mb~ - 3a -.
It is another object of the present invention to provide an improved, removable, one-piece, stamped sheet metal, push-on, stud retaining fastener of the thin walled type wherein the fastener is formed by punching or 5 piercing a hole in a fastener blank and then forming a dome shaped depression into the blank to obtain the generally frusto-conical cross sectional shape of the fastener from the same side of the blank as the hole punching or piercing operation, the generally dome shaped lQ depression having an axis generally coaxial with the axis of the punched hole and wherein a tab is formed which may be gripped and then pulled to split the fastener for removal of a retained stud.
These and other objects and advantages of the 15 present invention will become apparent from a reading of the attached detailed description of the preferred embodi-ment taken in connection with the attached drawings.
Brief Description of the Drawings FIG. 1 is a perspective view of the removable 20 fastener of the present invention.
FIG. 2 is a perspective view of an alternate embodiment of the removable fastener of the present invention.
FIG. 3 is a cross sectional schematic illus-25 tration of the first step in producing a fastener inaccordance with the present invention, said first step comprising partially punching or piercing a hole into the fastener blank.
FIG. 4 is a cross sectional schematic 30 illustration of the second step in producing a fastener in accordance with the present invention, said second step comprises the forming of a generally dome shaped depression generally coaxial with the axis of the punched hole from the same side of the fastener blank as the hole punching 35 operation.
FIG. 5 is a cross sectional illustration of the removable fastener of the present invention as retaining a stud in an apertured panel.
FIG. 6 is a perspective view of the removable 5 push-on stud retaining fastener of the present invention as utilized to retain a stud in an apertured panel.
Descri tion of the Preferred Embodiment p Certain terminology will be used in the following description for convenience in reference only and will not 10 be limiting. The words "up", "down", "top", "bottom", "upwardly", "downwardly", if used, will designate direc-tions in the drawings to which such reference is made.
Said terminology will include the words above specifically mentioned, derivatives thereof, and words of a similar 15 import.
One piece, stamped, sheet metal, push-on stud retaining fasteners of the prior art and of the present invention both are, when utilized to retain a cross sectionally round stud, of a generally annular shape, 20 having a generally centrally located annular stud retaining aperture, a generally frusto-conical annulus surrounding and defining the stud retaining aperture and a generally annular outer flange, the flange being generally perpen-dicular to the axis of the aperture. These devices are 25 generally thin walled, that is, stamped from a relatively thin sheet of springy, hardened steel or stainless steel.
The fasteners operate by frictionally gripping the outer edges of the stud.
The term "stud" as used herein is intended to 30 mean an elongated member of generally constant cross-section, such as a rod, shaft, bar, wire or the like.
For illustrative purposes only, the fasteners, and studs retained thereby, illustrated in this description will be shown as of a generally round cross-section. It is under-35 stood, however, that the fastener of the present invention --6--is also intended and suitable for retention of studs having any cross-sectional shape.
The removable fastener 10 of the present invention may be seen as utilized to secure a stud, such 5 as a metallic or ceramic stud, extending from an electrical component or the like, to an apertured panel by reference to FIG. 6. In a typical application of the present invention, the electrical lead of an electrical component is positively retained to a panel or a wire lead or 10 terminal of an electrical component is retained to a panel prior to soldering thereof by use of the fastener of the present invention~ The use of such fasteners in precision miniature and/or microminiature assembly requires that the transverse dimensions thereof, that is, the radius 15 of the annular flanges, be minimized allowing the studs to be retained on closer centerlines. It is also desirable that the fastener 10 be quickly and easily removable without causing damage to the retained electrical lead or the like.
In view of the relatively greater cost of electrical components as compared to the cost of the fasteners of the present invention, destruction of the fasteners when removing same to minimize or eliminate damage to the component during the removal operation is considered 25 desirable.
The methods of producing and the structural ~
features of the improved, one-piece, stamped sheet metal, removable stud retaining fastener 10 of the present invention may be seen by reference to FIGS. 1 and 3 30 through 6.
The removable stud retaining fastener 10 of the present invention comprises a generally resilient body 12 of relatively thin, stamped sheet metal. The body 12 comprises a frusto-conical annulus 14 defining a generally 35 centrally located stud retaining aperture 16 and a radially 2~
outwardly extending annular flange 18 of transverse ~imension 20. The stud retaining aperture 16 includes a radially inwardly extending stud retaining edge 22 which is adapted to engage and retain received studs. As will 5 be discussed in greater detail below, the stud receiving edge 22 of the fastener 10 is the relatively smooth continuous edge of a hole punched in the blank used to produce the fastener 10. Extending radially outwardly from the stud retaining aperture 16 is a tab 21 which may 10 be gripped by a tool or the like and pulled outwardly from stud retaining aperture to split the fastener 10 for removal thereof from a retained stud.
As mav be seen by reference to FIG. 3, the fastener 10 of the present invention is produced by pro-15 viding a generally annular blank 24 and then punching orpiercing a centrally located hole 26 therein. As may be seen from FIG. 4, a forming tool is utilized to form a generally dome shaped impression 28 in the blank 24 which provides the fastener body 12 with a generally frusto-20 conical cross-sectional shape. It is noted that the generally dome shaped impression 28 is coaxial with the axis of the punched hole 26. It is further noted that the forming tool strikes the blank 24 from the top side 30 thereof which is the same side that the punching tool 25 strikes the blank. By forming the generally dome shaped impression from the same side of the blank as the hole is punched from, the relatively smooth continuous upper edge 32 of the punched hole becomes the stud engaging edge rather than the relatively irregular burred edge 34 which 30 is at the bottom of the punched hole 26. Also, as the dome shaped impression is formed, the relatively smooth continuous upper edge 32 is stretched which produces a strong sharp edge 32. The tab 21 is preferably formed from the material of blank 24 partially severed from the 35 blank by the punch. The tab 21 thus defines a pair of generally annular surfaces for gripping by a plier or similar tool.
FIG. 5 illustrates the removabl~ fastener 10 of the present invention as assembled to a stud S to retain the stud S to an apertured panel P while FIG. 6 illustrates a panel in which a stud is retained by the removable 5 fastener 10 of the present invention.
FIG. 2 illustrates an alternate embodiment of the present invention in which the removable stud retain-ing fastener comprises a body 112, a generally conical annulus 114, a stud retaining aperture 116 and an annular 10 flange 118. A tab 121 extends radially outwardly from the flange 118 for gripping by a tool and to be pulled upwardly and towards the aperture 116 to split the fastener 110 for removal thereof from a retained stud. Except for the location of the tabs, fasteners 10 and 110 are substanti-15 ally identical.
Although this invention has been described in itspreferred form with a certain degree of particularity, it is understood that the present disclosure of the preferred form has been made only by way of example and that numerous 20 changes in the details of construction and combination and arrangement of parts may be resorted to without departing from the spirit and the scope of the invention as herein-after claimed.
The forming of the generally dome shaped impression from Z-~
the direction opposite the direction of the punching of the hole assured that the "burr edge" of the punched hole was the stud retaining edge of the stud retaining aper-ture. The above mentioned ~nited States Patent No.
5 3,108,371, at Column 4, lines 37 to 51, is an example of such a so-called "reverse formed" stud retaining fastener.
Other prior art devices utilized a swaging operation to assure that the stud retaining edge of the stud retaining aperture was given a rough, biting surface. The prior art 10 stud retaining fasteners operated by frictionally gripping the exterior side walls of a retained stud. Such prior art devices usually resisted undesired removal of a retained stud by bitingly penetrating the outer edge of said studs and were not easily removed. While such prior art stud 15 retaining fasteners were generally suitable for most applications, the present tendency to use such fasteners in so-called miniature and/or microminiature devices has led to an attempt to minimize the outer transverse dimensions of said fasteners. Reduction of the transverse 20 dimension of such fasteners will allow the retention of studs on closer centerlines. Prior attempts to minimize the other transverse dimensions have been relatively un-successful as the prior art push-on fasteners have utilized a stud retaining aperture having a rough biting edge or 25 burred edge and/or a slotted or slitted edge to provide the stud engaging edge of such fasteners. The use of such burred edge and/or slitted edge has prevented attempts to minimize the outer dimensions of said prior art fasteners as the burred and/or slitted edges contained many cracks, 30 discontinuations, stress concentrations and/or irregular-ities therein which has resulted in premature cracking and/or other failure of the fastener body unless at least a predetermined minimal outer dimension thereof was provided.
11~16Z4 According to the present invention therc Ls prov-lded fl one-lLcce, stamped shect metnl, removable stu(l retainLng fastener including a body having a generally continuous, generally centrally located stud retaining aperture and a generally continuous, generally dome shaped impression generally coaxial with the aperture. The aperture defines a stud retaining edge, the aperture being formed from a pierced hole having a relatively smooth continuous and a burred edge. The stud retaining edge being formed from the relatively smooth continuous edge of the pierced hole. A
tab extends from the body.
In accordance with the present invention, many of the drawbacks of the prior art devices have been overcome by the provision of the improved, removable, one-piece, thin walled, stamped sheet metal push-on stud retaining fastener having a minimized outer transverse dimension.
The above is accomplished by utilizing the relatively smooth continuous edge of a hole punched or pierced in the sheet metal blank rather than the burred edge of the hole punched in the sheet metal blank as the stud retaining edge of the stud retaining aperture of the fastener. Applicant has discovered that when the dome shaped impression is formed in the sheet metal blank after the hole is punched therein from the same direction as the direction from which the hole was punched, the relatively smooth edge of the punched hole is compressingly formed into a strong, sharp, relatively uninterrupted, continuous edge. Such a strong, sharp, continuous edge is considerably more resistant to cracking and/or other failure than is a burred edge or a slitted edge mb/~ 3 : `
~ . . . .
z~
and thus redllces the re~lllLremellt for mLIterlnl at tile transverse exl:relnit-~es oE ~lle ~astener body to prevellt cracking or other fni]ure thereof. The tab, extending from either the outer periphery o~ the Eastener or Erom the edge of tlle stlld retainin8 aperture, is provided which mav be gripped by a tool and then pulled to split and separate the body oE the fastener for selective removal of the fastener from a retained stud.
Accordingly, it is an object of the present invention to provide an improved, removable, push-on stud retaining fastener of the thin walled type.
It is a further object of the present invention to provide an improved, removable, one-piece, stamped sheet metal, push-on, stud retaining fastener of the thin walled type wherein the outer transverse dimensions of said fastener are minimized.
mb~ - 3a -.
It is another object of the present invention to provide an improved, removable, one-piece, stamped sheet metal, push-on, stud retaining fastener of the thin walled type wherein the fastener is formed by punching or 5 piercing a hole in a fastener blank and then forming a dome shaped depression into the blank to obtain the generally frusto-conical cross sectional shape of the fastener from the same side of the blank as the hole punching or piercing operation, the generally dome shaped lQ depression having an axis generally coaxial with the axis of the punched hole and wherein a tab is formed which may be gripped and then pulled to split the fastener for removal of a retained stud.
These and other objects and advantages of the 15 present invention will become apparent from a reading of the attached detailed description of the preferred embodi-ment taken in connection with the attached drawings.
Brief Description of the Drawings FIG. 1 is a perspective view of the removable 20 fastener of the present invention.
FIG. 2 is a perspective view of an alternate embodiment of the removable fastener of the present invention.
FIG. 3 is a cross sectional schematic illus-25 tration of the first step in producing a fastener inaccordance with the present invention, said first step comprising partially punching or piercing a hole into the fastener blank.
FIG. 4 is a cross sectional schematic 30 illustration of the second step in producing a fastener in accordance with the present invention, said second step comprises the forming of a generally dome shaped depression generally coaxial with the axis of the punched hole from the same side of the fastener blank as the hole punching 35 operation.
FIG. 5 is a cross sectional illustration of the removable fastener of the present invention as retaining a stud in an apertured panel.
FIG. 6 is a perspective view of the removable 5 push-on stud retaining fastener of the present invention as utilized to retain a stud in an apertured panel.
Descri tion of the Preferred Embodiment p Certain terminology will be used in the following description for convenience in reference only and will not 10 be limiting. The words "up", "down", "top", "bottom", "upwardly", "downwardly", if used, will designate direc-tions in the drawings to which such reference is made.
Said terminology will include the words above specifically mentioned, derivatives thereof, and words of a similar 15 import.
One piece, stamped, sheet metal, push-on stud retaining fasteners of the prior art and of the present invention both are, when utilized to retain a cross sectionally round stud, of a generally annular shape, 20 having a generally centrally located annular stud retaining aperture, a generally frusto-conical annulus surrounding and defining the stud retaining aperture and a generally annular outer flange, the flange being generally perpen-dicular to the axis of the aperture. These devices are 25 generally thin walled, that is, stamped from a relatively thin sheet of springy, hardened steel or stainless steel.
The fasteners operate by frictionally gripping the outer edges of the stud.
The term "stud" as used herein is intended to 30 mean an elongated member of generally constant cross-section, such as a rod, shaft, bar, wire or the like.
For illustrative purposes only, the fasteners, and studs retained thereby, illustrated in this description will be shown as of a generally round cross-section. It is under-35 stood, however, that the fastener of the present invention --6--is also intended and suitable for retention of studs having any cross-sectional shape.
The removable fastener 10 of the present invention may be seen as utilized to secure a stud, such 5 as a metallic or ceramic stud, extending from an electrical component or the like, to an apertured panel by reference to FIG. 6. In a typical application of the present invention, the electrical lead of an electrical component is positively retained to a panel or a wire lead or 10 terminal of an electrical component is retained to a panel prior to soldering thereof by use of the fastener of the present invention~ The use of such fasteners in precision miniature and/or microminiature assembly requires that the transverse dimensions thereof, that is, the radius 15 of the annular flanges, be minimized allowing the studs to be retained on closer centerlines. It is also desirable that the fastener 10 be quickly and easily removable without causing damage to the retained electrical lead or the like.
In view of the relatively greater cost of electrical components as compared to the cost of the fasteners of the present invention, destruction of the fasteners when removing same to minimize or eliminate damage to the component during the removal operation is considered 25 desirable.
The methods of producing and the structural ~
features of the improved, one-piece, stamped sheet metal, removable stud retaining fastener 10 of the present invention may be seen by reference to FIGS. 1 and 3 30 through 6.
The removable stud retaining fastener 10 of the present invention comprises a generally resilient body 12 of relatively thin, stamped sheet metal. The body 12 comprises a frusto-conical annulus 14 defining a generally 35 centrally located stud retaining aperture 16 and a radially 2~
outwardly extending annular flange 18 of transverse ~imension 20. The stud retaining aperture 16 includes a radially inwardly extending stud retaining edge 22 which is adapted to engage and retain received studs. As will 5 be discussed in greater detail below, the stud receiving edge 22 of the fastener 10 is the relatively smooth continuous edge of a hole punched in the blank used to produce the fastener 10. Extending radially outwardly from the stud retaining aperture 16 is a tab 21 which may 10 be gripped by a tool or the like and pulled outwardly from stud retaining aperture to split the fastener 10 for removal thereof from a retained stud.
As mav be seen by reference to FIG. 3, the fastener 10 of the present invention is produced by pro-15 viding a generally annular blank 24 and then punching orpiercing a centrally located hole 26 therein. As may be seen from FIG. 4, a forming tool is utilized to form a generally dome shaped impression 28 in the blank 24 which provides the fastener body 12 with a generally frusto-20 conical cross-sectional shape. It is noted that the generally dome shaped impression 28 is coaxial with the axis of the punched hole 26. It is further noted that the forming tool strikes the blank 24 from the top side 30 thereof which is the same side that the punching tool 25 strikes the blank. By forming the generally dome shaped impression from the same side of the blank as the hole is punched from, the relatively smooth continuous upper edge 32 of the punched hole becomes the stud engaging edge rather than the relatively irregular burred edge 34 which 30 is at the bottom of the punched hole 26. Also, as the dome shaped impression is formed, the relatively smooth continuous upper edge 32 is stretched which produces a strong sharp edge 32. The tab 21 is preferably formed from the material of blank 24 partially severed from the 35 blank by the punch. The tab 21 thus defines a pair of generally annular surfaces for gripping by a plier or similar tool.
FIG. 5 illustrates the removabl~ fastener 10 of the present invention as assembled to a stud S to retain the stud S to an apertured panel P while FIG. 6 illustrates a panel in which a stud is retained by the removable 5 fastener 10 of the present invention.
FIG. 2 illustrates an alternate embodiment of the present invention in which the removable stud retain-ing fastener comprises a body 112, a generally conical annulus 114, a stud retaining aperture 116 and an annular 10 flange 118. A tab 121 extends radially outwardly from the flange 118 for gripping by a tool and to be pulled upwardly and towards the aperture 116 to split the fastener 110 for removal thereof from a retained stud. Except for the location of the tabs, fasteners 10 and 110 are substanti-15 ally identical.
Although this invention has been described in itspreferred form with a certain degree of particularity, it is understood that the present disclosure of the preferred form has been made only by way of example and that numerous 20 changes in the details of construction and combination and arrangement of parts may be resorted to without departing from the spirit and the scope of the invention as herein-after claimed.
Claims (4)
1. A one-piece, stamped sheet metal, removable stud retaining fastener comprising a body having a gener-ally continuous, generally centrally located stud retain-ing aperture and a generally continuous, generally dome shaped impression generally coaxial with the aperture, said aperture defining a stud retaining edge, said aperture formed from a pierced hole having a relatively smooth con-tinuous edge and a burred edge, said stud retaining edge being formed from the relatively smooth continuous edge of the pierced hole, and a tab extending from body.
2. The fastener of claim 1 wherein said tab extends from said aperture and is formed from the material pierced to form said pierced hole.
3. The fastener of claim 1 wherein said body defines a generally radially outwardly extending flange and said tab extends from said flange.
4. A one-piece, stamped sheet metal removable stud retaining fastener comprising a body having a gener-ally centrally located stud retaining aperture and a generally dome shaped impression generally coaxial with the aperture, said aperture formed from a partially pierced hole having a relatively smooth, continuous edge and a burred edge, said dome shaped impression having a convex side and a concave side, said relatively smooth continuous edge being on the concave side of said generally dome shaped impression, and a tab defined by the material partially pierced to form said partially pierced hole extending radially outwardly from said aperture, said tab adapted to be gripped and then pulled to split said fastener for removal of said fastener from a retained stud.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US95955978A | 1978-11-09 | 1978-11-09 | |
| US959,559 | 1978-11-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1121624A true CA1121624A (en) | 1982-04-13 |
Family
ID=25502137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000337175A Expired CA1121624A (en) | 1978-11-09 | 1979-10-09 | Removable stud retaining fastener |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5565705A (en) |
| CA (1) | CA1121624A (en) |
| GB (1) | GB2034848B (en) |
| MX (1) | MX6036E (en) |
-
1979
- 1979-10-09 CA CA000337175A patent/CA1121624A/en not_active Expired
- 1979-11-01 JP JP14052579A patent/JPS5565705A/en active Pending
- 1979-11-01 MX MX798470U patent/MX6036E/en unknown
- 1979-11-06 GB GB7938438A patent/GB2034848B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| MX6036E (en) | 1984-10-08 |
| GB2034848B (en) | 1982-12-22 |
| GB2034848A (en) | 1980-06-11 |
| JPS5565705A (en) | 1980-05-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |