A method for creating a hole for a permanent fastener that replaces a temporary fastener that fastens two adjacent workpieces. The temporary fastener includes a shank that extends through a hole of the workpieces. Extending from one end of the shank is a conical shaped head. The temporary fastener has an inner channel that extends through the shank from the head to the opposite end. The fastener also contains a pull stem which has a head located adjacent to the blind end of the shank. The stem head is pulled through the shank to expand and is expanded to tightly fasten the shank to the workpieces. The fastener is removed by drilling through the head and the shank. The diameter of the conical shank head is smaller than the diameter of the drill so that part of the head does not become attached to the drill bit and scratch the workpiece. The conical shape of the head also reduces the volume of fastener material to further reduce the size and amount of chips produced during the drilling process. The tightly engaged shank prevents the fastener from rotating during the drilling operation.
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0. 5. A method for creating a hole for a permanent fastener which fastens a first workpiece to an adjacent second workpiece, comprising the steps of:
a) providing a tacking fastener that includes a shank which has an inner channel, a first end, a second end and a shank head which extends from said first end, said tacking fastener further includes a stem that extends through said inner channel of said shank and has a head located adjacent to said second end of said shank; b) drilling a first hole through the first and second workpieces; c) inserting said shank and said stem into said first hole so that said stem head extends from the second workpiece and said shank head is adjacent to the first workpiece; d) pulling said stem head through said inner channel to expand said shank and secure said shank to the first and second workpieces; and, e) drilling said shank head, said shank and the first and second workpieces a drill bit that has a diameter larger than a diameter of said conical shaped head.
0. 24. A method of replacing a tacking fastener that temporarily joins a first workpiece and a second workpiece with a permanent fastener to permanently join the workpieces, said tacking fastener including a shank of a cylindrical shape with a first end and an opposing second end, a conical shaped head having a head diameter joined to the shank at the first end, and an inner channel coaxial with and open at the head, said head placed adjacent to the first workpiece, said shank extending through the workpieces, said shank deformed adjacent to the second workpiece to join the workpieces, said method comprising:
engaging a drill bit with the inner channel at the head, said drill bit having a diameter larger than the head diameter; drilling the head, the shank, the first workpiece, and the second workpiece to form a hole through the workpieces; and joining the first workpiece and the second workpiece with the permanent fastener, said permanent fastener extending through the hole.
0. 12. A method for creating a hole for a permanent fastener that fastens a first workpiece to an adjacent second workpiece, comprising:
providing a tacking fastener that includes a shank that has an inner channel, a first end, a second end, and a conical shaped head, the conical shaped head extending from the first end, the conical shaped head having a diameter smaller than a diameter of the hole for the permanent fastener; drilling a tacking hole through the first and second workpieces; inserting the shank of the tacking fastener into the tacking hole so that the second end extends from the second workpiece and the conical shaped head is adjacent to the first workpiece; expanding the shank to secure the shank to the first and second workpieces; and, drilling the conical shaped head, the shank, the first workpiece, and the second workpiece to create the hole for the permanent fastener using a drill bit that has a diameter larger than a diameter of the conical shaped head.
1. A method for creating a hole for a permanent fastener which fastens a first workpiece to an adjacent second workpiece, comprising the steps of:
a) providing a tacking fastener that includes a shank which has an inner channel, a first end, a second end and a conical shaped head which extends from said first end, said tacking fastener further includes a stem that extends through said inner channel of said shank and has a head located adjacent to said second end of said shank; b) drilling a first hole through the first and second workpieces; c) inserting said shank and said stem into said first hole so that said stem head extends from the second workpiece and said conical shaped head is adjacent to the first workpiece; d) pulling said stem head through said inner channel to expand said shank and secure said shank to the first and second workpieces; and, e) drilling said conical shaped head, said shank and the first and second workpieces with a drill bit that has a diameter larger than a diameter of said conical shaped head.
8. A method for creating a hole for a permanent fastener which fastens a first workpiece to an adjacent second workpiece, wherein the first workpiece has a flat outer surface, comprising the steps of:
a) providing a tacking fastener that includes a shank which has an inner channel, a first end, a second end and a conical shaped head which extends from said first end, said tacking fastener further includes a stem that extends through said inner channel of said shank and has a head located adjacent to said second end of said shank; b) drilling a first hole through the first and second workpieces; c) inserting said shank and said stem into said first hole so that said stem head extends from the second workpiece and said conical shaped head extends from the flat outer surface of the first workpiece; d) pulling said stem head through said inner channel to expand said shank and secure said shank to the first and second workpieces; and, e) drilling said conical shaped head, said shank and the first and second workpieces with a drill bit that has a diameter larger than a diameter of said conical shaped head.
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the shank includes a first portion that is within the tacking hole and a second portion that extends from the second workpiece; expanding the shank includes expanding the first portion of the shank to have a diameter substantially the same as a diameter of the tacking hole and expanding the second portion to have a diameter larger than a diameter of the tacking hole.
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the shank includes a first portion that is enclosed by the workpieces and a second portion that extends from the second workpiece; deforming the shank includes expanding the first portion of the shank to tightly engage the workpieces and expanding the second portion to bear against the second workpiece.
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Referring to the drawings more particularly by reference numbers,
The fastener 10 includes a pull stem 26 that extends through the inner channel 18 of the shank 12. The pull stem 26 has a stem head 28 that is located adjacent to the second end 16 of the shank 12. The stem 26 also has a serrated pull portion 30 that can be gripped by a pull gun (not shown) to pull the head 28 through the inner channel 18 of the shank 12. The stem head 28 may have a tapered portion 32 which leads the head 28 into the inner channel 34. The tapered portion 32 extends to an annular tip portion 34. The tip portion 34 typically has a diameter larger than the diameter of the inner channel 18 so that the head 28 expands the shank 12 as the stem 26 is pulled through the channel 18. The stem head 28 may have an inner cavity 36 which allows the head 28 to contract as the stem 26 is pulled through the shank 12, particularly as the shank expands tightly into the surrounding hole in the work pieces.
In the preferred embodiment, the shank 12 is constructed from an aluminum material and the pull stem 26 is constructed from a steel material. The fastener 10 preferably has the dimensions listed in Table I. Various embodiments are listed, each embodiment corresponding to a particular size of permanent fastener which will replace the tacking fastener 10. For example, the first row of values provide dimensions for a tacking fastener 10 that corresponds to a permanent fastener which has a 0.1562 inch diameter, the second row relates to a permanent fastener diameter of 0.1875 inches and so forth and so on. All dimensions are in inches.
TABLE I | |||||
PERMANENT | SHANK | DRILL SIZE FOR | |||
FASTENER | DIAMETER | HEAD DIAMETER | HEAD LENGTH | INSTALLATION | PERMANENT |
DIAMETER | D | H | L | HOLE DIAMETER | FASTENER |
0.1562 | 0.093-0.097 | 0.128 | 0.036 | 0.098-0.107 | #20 |
0.1875 | 0.125-0.128 | 0.170 | 0.042 | 0.1285-0.1436 | #10 |
0.250 | 0.155-0.159 | 0.212 | 0.055 | 0.160-0.178 | #F |
As shown in
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The expanded shank 12 is in tight engagement with the workpieces so that the fastener does not spin during the drill process. Additionally, the angle A of the conical head 20 is preferably different than the drill angle of the drill bit 54. The different angles reduce the amount of slippage between the bit 54 and the head 20. In the preferred embodiment, the angle A is 100°C, with the corresponding angle of the drill being 120°C. This assures that the head will finally drill out from outer diameter to inner diameter, thereby preventing the separation of a washer-like section of the head to clog the drill and cause the same to stop drilling, and perhaps to wander to damage the work piece. The present invention thus provides a temporary fastener that does not spin or create scratches on the workpiece when removed by a drill.
While certain exemplary embodiments have been described and shown in the accompanying drawings, it is to be understood that such embodiments are merely illustrative of and not restrictive on the broad invention, and that this invention not be limited to the specific constructions and arrangements shown and described, since various other modifications may occur to those ordinarily skilled in the art.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Nov 22 1999 | Allfast Fastening Systems, Inc. | (assignment on the face of the patent) | / | |||
Oct 22 2014 | TriMas Corporation | JPMORGAN CHASE BANK, N A , AS COLLATERAL AGENT | SECURITY INTEREST SEE DOCUMENT FOR DETAILS | 034160 | /0884 | |
Oct 22 2014 | ALLFAST FASTENING SYSTEMS, LLC | JPMORGAN CHASE BANK, N A , AS COLLATERAL AGENT | SECURITY INTEREST SEE DOCUMENT FOR DETAILS | 034160 | /0884 |
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