US2712768A - Fastener strip and method of making same - Google Patents
Fastener strip and method of making same Download PDFInfo
- Publication number
- US2712768A US2712768A US173185A US17318550A US2712768A US 2712768 A US2712768 A US 2712768A US 173185 A US173185 A US 173185A US 17318550 A US17318550 A US 17318550A US 2712768 A US2712768 A US 2712768A
- Authority
- US
- United States
- Prior art keywords
- strip
- leg
- edge
- fastener
- point
- 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 - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title description 5
- 239000002184 metal Substances 0.000 description 10
- 238000007373 indentation Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 238000006679 Martin dehydration reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Images
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
- F16B15/00—Nails; Staples
- F16B15/08—Nails; Staples formed in integral series but easily separable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/36—Making other particular articles clips, clamps, or like fastening or attaching devices, e.g. for electric installation
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12201—Width or thickness variation or marginal cuts repeating longitudinally
Definitions
- This invention relates to fasteners of a type which are formed from a strip or ribbon of metal, the strip being processed to provide a connected series or strip of individual fastener blanks, and the present invention is for an improved fastener strip and method of making the same.
- an ribbon or strip of metal is slit at regular intervals to provide a succession of leg-forming elements, these slits extending diagonally from the edge toward the center of the strip, and the slit then extending longitudinally for a distance sufiicient to form a leg element of the desired length.
- Such fastener strips are commonly coiled or wound upon reels, which reels are placed in a driving machine designed to. feed the strip to a driver wherein the forming of the blanks is completed and they are progressive driven as individual fasteners.
- this leg-forming element may be bent downwardly on an axis transverse to the length of the strip until it is perpendicular to its original plane, thus forming the leg of the tack, while a section of the original strip to which the leg is attached provides the head.
- notches mediate the leg-forming elements. These notches are utilized both in blanking out the strip and in subsequently feeding it into the driving machine, serving as indexing or feeding notches, and they also define the length of the head-forming portion of each blank.
- the points of the leg-forming elements of such blanks are beveled in only one direction, which sometimes produces a deflection of the leg when it is being driven.
- the present invention provides a method and a fastener strip in which both these objections are overcome without any appreciable increase of cost or additional handling.
- a chordal segment of metal is removed from the edge of the strip in the region of each point of a leg-forming element. This provides a relief that eliminates any protruding sharp points, and at the same time produces a more symmetrical point that will have less tendency to drift or deflect sideways when being driven.
- Fig. l is a plan view on a larger scale of a section of strip as shown in the said Lang application, except as to the exact shape of the feeding notches;
- Fig. 2 is a similar view of the strip as it is more apt to appear when produced by present methods of high speed operation, showing the slight irregularity of the points;
- FIG. 3 is a similar view showing a blank prepared in accordance with my invention.
- Fig. 4 illustrates a step in the actual preparation of the strip, showing the removal of chordal segments in advance of slitting
- Fig. 5 is a section through a portion of the machine for effecting such removal of segments
- Pig. 6 is a perspective view of the finished fastener.
- the strip in being fed to the tool, moves in the direction of the arrow.
- Leg portions 3 are formed along the opposite edge of the strip by longitudinal slits 4 and diagonal slits S that extend from each slit 4 to the edge of the strip, the legs thus having points 6.
- the legs are joined to the body of the strip at their opposite ends, the joining portions being designated 7. It will be noted that notches 2 are located intermediate the length of the legs.
- a chordal segment of metal is removed from the edge of the strip in the region of each point, so that arced indentations 9 are formed at equal intervals, and the point 8 terminates in this indentation.
- These indents may be formed by an abrasive wheel, but they are preferably formed by a punch 10, represented in phantom lines in Fig. 3.
- the indents may be formed on the otherwise completed blank. However, when using a punch, it is preferable, as indicated in Fig. 4, to form them in the blank strip before slitting, as there is then better control of the indenting operation than is obtainable after the slitting.
- Fig. 5 One method of indenting is shown in Fig. 5, wherein 11 is the bed of a die along which the strip is moved.
- the strip is advanced step by step along this bed, and after each movement the punch 10 operates, passing through a hole 12 in the bed of the die.
- the punch 10 would normally be one of several punches that operate simultaneously at different stations along the strip, so that the indenting operation does not introduce any extra handling into the manufacture of the strip.
- the indents so formed avoid a condition where the points of the legs can project beyond the marginal edge of the strip. Each point is necessarily located within the width of the strip, so that snagging of the points when the strip is coiled cannot occur.
- the indenting also forms a bevel at So on the point of an angle opposite the slope of the slit 5. in the other words, by reason of such indents the point is beveled or sloped in two directions. Such a point has less tendency, when being driven, to deflect or drift sideways.
- a strip of connected staple fastener blanks comprising a ribbon of metal having a succession of partially severed leg-forming elements extending along one edge only and extending over substantially half of said metal ribbon, each leg-forming element having a sloped point formed by the severing slit and having a portion opposite the point which is connected to the body of the ribbon, the aforesaid edge of said strip having a succession of indentations therein, a portion of each indentation forming a sloped part of the point of the leg-forming element which intersects the first mentioned slope of the point.
- a connected series of T-tack blanks comprising a ribbon of metal slitted with connected diagonal and longitudinal slits from one edge thereof at regular intervals providing a succession of pointed leg-forming elements along'one edge of the strip, said strip having a succession of indentations in said edge, the indentations being located to include the points where each diagonal slit begins so that the point of each leg starts at such an indentation and lies inside the line defining the original straight edge of the strip.
- ted staple fastener blanks com- 1 having a succession of pointed edge containi mid portion 0 in part by sai wardly from-t of the ribbon.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Slide Fasteners (AREA)
Description
July 12, 1955 R WINKLER 2,712,768
FASTENER STRIP AND METHOD OF MAKING SAME Filed July 11, 1950 Zmnentor Ric/lard Winkle)" United States Patent Ofiice 2,732,7ss Patented July 12, 1955 2,712,768 FASTENER STRIP AND METHOD 0F MAKING SAME Richard Winkler, Chicago, Ill., assignor, by mesne assignments, to Bocji Corporation, Pittsburgh, Pa., a corporation of Delaware Application July 11, 1956, Serial No. 173,185 4 Claims. (Cl. 8517) This invention relates to fasteners of a type which are formed from a strip or ribbon of metal, the strip being processed to provide a connected series or strip of individual fastener blanks, and the present invention is for an improved fastener strip and method of making the same.
In the formation of a strip of fastener blanks of the type to which the present invention relates, an ribbon or strip of metal is slit at regular intervals to provide a succession of leg-forming elements, these slits extending diagonally from the edge toward the center of the strip, and the slit then extending longitudinally for a distance sufiicient to form a leg element of the desired length. Such fastener strips are commonly coiled or wound upon reels, which reels are placed in a driving machine designed to. feed the strip to a driver wherein the forming of the blanks is completed and they are progresdriven as individual fasteners.
One specific form of such a strip of fastener blanks is disclosed in a. copending application of Serial No. 63 6,467, filed December 21, 1945, now Patent No. 2,597,343 of May 20, 1952. In this application there is sh wn and described a tack-like fastener of T shape which is formed from a flat strip of metal which is slit longitudinally at regular intervals, and at one end each slit then extends diagonally to the edge of the strip. The edge portion of the strip defined by the slit constitutes a leg-forming element. In the subsequent use of the strip, this leg-forming element may be bent downwardly on an axis transverse to the length of the strip until it is perpendicular to its original plane, thus forming the leg of the tack, while a section of the original strip to which the leg is attached provides the head.
In the strip shown in the with notches, mediate the leg-forming elements. These notches are utilized both in blanking out the strip and in subsequently feeding it into the driving machine, serving as indexing or feeding notches, and they also define the length of the head-forming portion of each blank.
One difficulty encountered with strips so formed is that the points of the leg-forming elements may project slightly from the edge of the strip, and hence adjacent convolutions of the coiled strip will catch or snag, sometimes interfering with the proper feeding of the strip in the driving machine.
Also, the points of the leg-forming elements of such blanks are beveled in only one direction, which sometimes produces a deflection of the leg when it is being driven.
The present invention provides a method and a fastener strip in which both these objections are overcome without any appreciable increase of cost or additional handling.
According to the present invention, a chordal segment of metal is removed from the edge of the strip in the region of each point of a leg-forming element. This provides a relief that eliminates any protruding sharp points, and at the same time produces a more symmetrical point that will have less tendency to drift or deflect sideways when being driven.
My invention may be more fully understood by reference to the accompanying drawings, in which:
Fig. l is a plan view on a larger scale of a section of strip as shown in the said Lang application, except as to the exact shape of the feeding notches;
Fig. 2 is a similar view of the strip as it is more apt to appear when produced by present methods of high speed operation, showing the slight irregularity of the points;
Fig. 3 is a similar view showing a blank prepared in accordance with my invention;
Fig. 4 illustrates a step in the actual preparation of the strip, showing the removal of chordal segments in advance of slitting;
Fig. 5 is a section through a portion of the machine for effecting such removal of segments; and
Pig. 6 is a perspective view of the finished fastener.
The strip 1, as originally designed, and which is here shown for purposes of illustration, no claim being made to it in this application, is provided at regular intervals along one edge with notches 2, and which are adapted to be engaged by the feeding of mechanism of a tool which forms, cuts and drives the cession of blanks in the strip. The strip, in being fed to the tool, moves in the direction of the arrow. Leg portions 3 are formed along the opposite edge of the strip by longitudinal slits 4 and diagonal slits S that extend from each slit 4 to the edge of the strip, the legs thus having points 6. The legs are joined to the body of the strip at their opposite ends, the joining portions being designated 7. It will be noted that notches 2 are located intermediate the length of the legs.
Practical methods for the high speed manufacture of these strips are likely to result in the points 3 projecting slightly, as shown in Fig. 2. This results in the snagging difliculties when the strip is being fed from reels into which it is coiled for use in the driving tool.
According to the present invention, a chordal segment of metal is removed from the edge of the strip in the region of each point, so that arced indentations 9 are formed at equal intervals, and the point 8 terminates in this indentation. These indents may be formed by an abrasive wheel, but they are preferably formed by a punch 10, represented in phantom lines in Fig. 3.
The indents may be formed on the otherwise completed blank. However, when using a punch, it is preferable, as indicated in Fig. 4, to form them in the blank strip before slitting, as there is then better control of the indenting operation than is obtainable after the slitting.
One method of indenting is shown in Fig. 5, wherein 11 is the bed of a die along which the strip is moved. The strip is advanced step by step along this bed, and after each movement the punch 10 operates, passing through a hole 12 in the bed of the die. The punch 10 would normally be one of several punches that operate simultaneously at different stations along the strip, so that the indenting operation does not introduce any extra handling into the manufacture of the strip.
The indents so formed avoid a condition where the points of the legs can project beyond the marginal edge of the strip. Each point is necessarily located within the width of the strip, so that snagging of the points when the strip is coiled cannot occur. The indenting also forms a bevel at So on the point of an angle opposite the slope of the slit 5. in the other words, by reason of such indents the point is beveled or sloped in two directions. Such a point has less tendency, when being driven, to deflect or drift sideways.
A "3 I have shown and described my invention specifically with reference to one particular form of fastener, but it has application to any form of fastener having one or more leg-forming elements lying in the plane of a strip and more or less parallel to the axis of the strip. It will be further understood that invention is not confined to the particular form of apparatus herein specifically described.
I claim:
l. A strip of connected staple fastener blanks comprising a ribbon of metal having a succession of partially severed leg-forming elements extending along one edge only and extending over substantially half of said metal ribbon, each leg-forming element having a sloped point formed by the severing slit and having a portion opposite the point which is connected to the body of the ribbon, the aforesaid edge of said strip having a succession of indentations therein, a portion of each indentation forming a sloped part of the point of the leg-forming element which intersects the first mentioned slope of the point.
2. A connected series of T-tack blanks comprising a ribbon of metal slitted with connected diagonal and longitudinal slits from one edge thereof at regular intervals providing a succession of pointed leg-forming elements along'one edge of the strip, said strip having a succession of indentations in said edge, the indentations being located to include the points where each diagonal slit begins so that the point of each leg starts at such an indentation and lies inside the line defining the original straight edge of the strip.
3. The method of forming a strip of connected staple fastener blanks which comprises notching one edge of a ribbon of metal to form chordal indentations at regular intervals therealong, and then slitting the said edge of the metal with connected diagonal and longitudinal slits to 3;
form a regular succession of pointed leg-forming elements, the slits beginning i 'the ends of said chordal in end of each leg-forming element tation and the indentation forms part of the point.
ted staple fastener blanks com- 1 having a succession of pointed edge containi mid portion 0 in part by sai wardly from-t of the ribbon.
References Cited in the file of this patent UNITED STATES PATENTS Jordan Sept. 4, Nilsson Feb. 20, Lewis Apr. 4, McChesney Nov. 17, Novick Mar. 2, McFaul Mar. 16, Carlile May 20, Kanuf Nov. 10, Poux Nov. 24, Ulrich Feb. 9, Lang Aug. 21, Martines Oct. 4, Jackson Feb. 7, Lang May 20,
FOREIGN PATENTS France May 29,
n each instance intermediate dentations so that the point merges into such indend by having one marginal of substantial depth in the ch leg-forming eleoint is spaced inight edge
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US173185A US2712768A (en) | 1950-07-11 | 1950-07-11 | Fastener strip and method of making same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US173185A US2712768A (en) | 1950-07-11 | 1950-07-11 | Fastener strip and method of making same |
Publications (1)
Publication Number | Publication Date |
---|---|
US2712768A true US2712768A (en) | 1955-07-12 |
Family
ID=22630876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US173185A Expired - Lifetime US2712768A (en) | 1950-07-11 | 1950-07-11 | Fastener strip and method of making same |
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US (1) | US2712768A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2867824A (en) * | 1955-05-04 | 1959-01-13 | Illinois Tool Works | Method for making sheet material split-ring lock washers |
US3615273A (en) * | 1968-09-13 | 1971-10-26 | Rador Sa | Strip for obtaining a barbed element |
US4165629A (en) * | 1976-01-21 | 1979-08-28 | Mccabe Francis J | Multi-punch, multi-die assembly for stamping hook-shaped damper hinge members |
Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US399154A (en) * | 1889-03-05 | o neil | ||
US515156A (en) * | 1894-02-20 | Box-fastening | ||
US786504A (en) * | 1904-01-06 | 1905-04-04 | American Metal Edge Box Company | Die for cutting contiguous fasteners. |
FR798969A (en) * | 1935-12-09 | 1936-05-29 | Franco Suisse D Emboutissage S | Process for manufacturing nails with several points and nails obtained by this process |
US2061037A (en) * | 1933-10-04 | 1936-11-17 | Lula A Mcchesney | Method of producing flanged joint fasteners |
US2072125A (en) * | 1931-02-14 | 1937-03-02 | Us Envelope Co | Fastener strip |
US2073943A (en) * | 1936-05-01 | 1937-03-16 | Gerrard Co Inc | Method of making multiplex fasteners or nails |
US2242967A (en) * | 1939-01-05 | 1941-05-20 | Talon Inc | Staple strip |
US2301288A (en) * | 1940-10-31 | 1942-11-10 | Rca Corp | Terminal |
US2302911A (en) * | 1933-12-16 | 1942-11-24 | Talon Inc | Apparatus for making separable fasteners |
US2310660A (en) * | 1939-03-28 | 1943-02-09 | Conmar Prod Corp | Machine and method for making slide fasteners |
US2383135A (en) * | 1943-06-04 | 1945-08-21 | Bocil Corp | Staple |
US2483424A (en) * | 1947-03-31 | 1949-10-04 | Electric Terminal Corp | Method of soldering terminals for electrical conductors |
US2496626A (en) * | 1946-07-13 | 1950-02-07 | Pittsburgh Des Moines Company | Spherical tank shell |
US2597343A (en) * | 1945-12-21 | 1952-05-20 | Bocjl Corp | Connected strip of fastener units |
-
1950
- 1950-07-11 US US173185A patent/US2712768A/en not_active Expired - Lifetime
Patent Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US515156A (en) * | 1894-02-20 | Box-fastening | ||
US399154A (en) * | 1889-03-05 | o neil | ||
US786504A (en) * | 1904-01-06 | 1905-04-04 | American Metal Edge Box Company | Die for cutting contiguous fasteners. |
US2072125A (en) * | 1931-02-14 | 1937-03-02 | Us Envelope Co | Fastener strip |
US2061037A (en) * | 1933-10-04 | 1936-11-17 | Lula A Mcchesney | Method of producing flanged joint fasteners |
US2302911A (en) * | 1933-12-16 | 1942-11-24 | Talon Inc | Apparatus for making separable fasteners |
FR798969A (en) * | 1935-12-09 | 1936-05-29 | Franco Suisse D Emboutissage S | Process for manufacturing nails with several points and nails obtained by this process |
US2073943A (en) * | 1936-05-01 | 1937-03-16 | Gerrard Co Inc | Method of making multiplex fasteners or nails |
US2242967A (en) * | 1939-01-05 | 1941-05-20 | Talon Inc | Staple strip |
US2310660A (en) * | 1939-03-28 | 1943-02-09 | Conmar Prod Corp | Machine and method for making slide fasteners |
US2301288A (en) * | 1940-10-31 | 1942-11-10 | Rca Corp | Terminal |
US2383135A (en) * | 1943-06-04 | 1945-08-21 | Bocil Corp | Staple |
US2597343A (en) * | 1945-12-21 | 1952-05-20 | Bocjl Corp | Connected strip of fastener units |
US2496626A (en) * | 1946-07-13 | 1950-02-07 | Pittsburgh Des Moines Company | Spherical tank shell |
US2483424A (en) * | 1947-03-31 | 1949-10-04 | Electric Terminal Corp | Method of soldering terminals for electrical conductors |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2867824A (en) * | 1955-05-04 | 1959-01-13 | Illinois Tool Works | Method for making sheet material split-ring lock washers |
US3615273A (en) * | 1968-09-13 | 1971-10-26 | Rador Sa | Strip for obtaining a barbed element |
US4165629A (en) * | 1976-01-21 | 1979-08-28 | Mccabe Francis J | Multi-punch, multi-die assembly for stamping hook-shaped damper hinge members |
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