The present invention is generally related to fasteners and, more particularly, is related to a system and method for securing a captive rivet to a first material.
Fastening two or more materials together with a rivet is a common practice in many manufacturing applications.
Rivet 100 further has a rivet shank 108 having a top portion 110. Since rivet 100 is a standard tubular rivet type, rivet shank 108 has an outside surface 112 and an inside surface 114. Rivet shank 108 has a bottom portion 116 that joins the rivet shank 108 and the rivet head 102.
The diameter (Dh) of the rivet head 102 is greater than the diameter (Ds) of the rivet shank 108. Thus, when the rivet shank 108 is inserted through aligned holes in the materials to be riveted together, the rivet 100 is prevented from passing entirely through the materials 202 and 204 as long as the diameter of the holes in the materials 202 and 204 are less than the diameter (Dh) of the rivet head 102.
As noted above, during the riveting process, the rivet shank 108 is inserted through the aligned holes of the materials 202 and 204. Depending upon the process, the rivet shank 108 may be inserted through the hole in the first material 202, and then later inserted through the hole in the second material 204. Alternatively, the materials 202 and 204 may be positioned together with their respective holes aligned such that the rivet shank 108 is inserted through the aligned holes in one step.
After the rivet shank 108 is inserted through the aligned holes of both materials 202 and 204, an anvil (not shown) is positioned against the exterior surface 106 of the rivet head 102. A hammer (not shown) is then used to deform the top portion 110 of the rivet shank 108 when the hammer applies a force to the top portion 110. In this illustrative example, the top portion 110 of the rivet shank 108 is deformed such that the top portion 110 contacts the second material 204 as shown.
Because the diameter (Dr) of the top portion of 110 of the rivet shank 108 is greater than the diameter of the aligned holes in the materials 202 and 204, and because the diameter (Dh) of the rivet head 102 (
In many riveting processes such as that described above, the insertion of the rivet shank 108 through the first material 202, or both materials 202 and 204, is performed by hand or performed by a device separate from the anvil. Accordingly, there will be a period of time when the rivet 100 is not held in place while the anvil is being positioned against the exterior surface 106 of the rivet head 102. During this time, the rivet 100 may slip out of position such that the riveting process cannot be completed.
The captive rivet system and method secures a captive rivet to a material. Briefly described, one embodiment is a captive rivet comprising a captive rivet head; a captive rivet shank coupled to the captive rivet head; and at least one capture region disposed on a lower portion of the captive rivet shank.
The components in the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding parts throughout the several views.
A captive rivet system provides a system and method for initially securing a captive rivet to a first material. After the captive rivet is inserted through a hole in the material, a captive rivet anvil is positioned against a head of the captive rivet. Then, a captive rivet hammer exerts force onto the material such that a portion of the material is deformed into a capture region of the captive rivet.
During later stages of the riveting process, the captive rivet is held in position relative to the first material by a deformed portion of the first material that extends into the capture channel to hold the captive rivet in place. Accordingly, the captive rivet is held securely in place such that the captive rivet shank may be inserted through an aligned hole in a second material, and/or such that the captive rivet shank may be deformed at a later time.
The captive rivet shank 308 includes an upper portion 318, an outside surface 320 and an inside surface 322. The lower portion 306 joins the captive rivet shank 308 and the captive rivet head 310.
As is also illustrated in
Then, the captive rivet hammer 404 is brought into contact with a portion 406 of the first material 316. Sufficient force is exerted by the captive rivet hammer 404 onto the portion 406 (denoted by the directional arrow 408) to cause the first material 316 to deform such that a deformed portion 410 of material 316 extends into the capture channel 304. In another embodiment, described in greater detail below, the exterior surface 314 of the captive rivet head 310 is forced into the portion 406 such that the exterior surface 314 of the captive rivet head 310 is flush with the surface of the material 316.
After the captive rivet hammer 404 and the captive rivet anvil 402 are retracted away from the captive rivet 302 and the material 316, the deformed portion 410 residing in the capture channel 304 holds the captive rivet 302 in place. Accordingly, the riveting process can proceed to another stage whereby the captive rivet shank 308 may be inserted through an aligned hole of a second material. The secured captive rivet 302 will not slip out of position during later stages of the riveting process due to the above-described deformation.
In an alternative embodiment of the captive rivet system 400, the deforming force is exerted by the captive rivet anvil 402 after the captive rivet hammer 404 is placed in position against the material 316, as described above (denoted by the directional arrow 412). In yet another embodiment of the captive rivet system 400, both the captive rivet anvil 402 and the captive rivet hammer 404 exert force against the material 316 to cause deformation of the material 316 such that a deformed portion 410 of material 316 is forced into the capture channel 304 (denoted by the directional arrows 408 and 412).
In some embodiments of the captive rivet system 400, the anvil 602 and the captive rivet anvil 402 (
The above-described riveting of the captive rivet 302 may be performed manually by a person using hand-held riveting tools. Alternatively, above-described riveting of the captive rivet 302 may be performed automatically by a riveting machine controlled by a riveting control system.
In one embodiment, captive rivet anvil controller 706 controls a mechanical actuator 716 that provides support, and/or a force (indicated by directional arrow 412), to the exterior side 314 of the captive rivet head 310, as described above. The support and/or force is applied when the mechanical actuator 716 is actuated to exert force onto shaft 718 in an upward direction (relative to the embodiment illustrated in
Similarly, captive rivet hammer controller 708 further controls a mechanical actuator 722 that provides a force (indicated by directional arrow 408), to the portion 406 of the material 316, as described above. The force is applied when the mechanical actuator 722 is actuated to exert force onto shaft 724 in a downward direction (relative to the embodiment illustrated in
In alternative embodiments, the automated captive rivet control system 702 comprises only one of the mechanical actuator 722 or the mechanical actuator 716. Thus, the mechanical actuator 722, or the mechanical actuator 716, is used to exert the force that deforms the first material 316 into the capture region, thereby securing the captive rivet 302 to the first material 316.
Mechanical actuators 716 and 722 may be any suitable apparatus and/or system configured to actuate shafts 718 and 724, respectively. Such mechanical actuators may be pneumatically-based actuators using fluids (gasses or liquids), may be electrical motors, or may be electromechanical devices. Furthermore, mechanical actuators 716 and/or 722 may employ force multiplication devices, such as levers, gears or other suitable force-multiplication devices. Accordingly, mechanical actuators 716 and/or 722 exert sufficient force upon the portion 406 of the material 316 so that the deformed portion 410 is deformed into the capture channel 304, as described above.
At a later stage in the riveting process, another hammer controller (not shown) causes the second hammer 604 (
Processing system 704 is illustrated for convenience as having at least processor 710 and memory 712. Processing system 704 controls the execution of the CR logic 714. Any suitable processor system 704 may be employed in various embodiments of a captive rivet control system 702. Processing system 704 may be a specially designed and/or fabricated processing system, or a commercially available processor system.
The fastening means provides for conversion of a manual force exerted by a user (denoted by directional arrows 808) into a mechanical force exerted on shafts 810 and 812 (denoted by the directional arrows 408 and 412, respectively). The process of exerting sufficient force upon the portion 406 of the material 316 so that the deformed portion 410 is deformed into the capture channel 304 has been described above.
Shafts 810 and/or 812 are optional in some embodiments. That is, the captive rivet hammer 404 may be directly coupled to first member 802, and/or the captive rivet anvil 402 may be directly coupled to second member 804.
A captive blind rivet 902 comprises a first rivet member 904 and a second rivet member 906. The illustrated first rivet member 904 comprises a captive rivet shank 908 having a capture channel 304 disposed thereon, and a captive rivet head 910, similar to the above-described embodiments of the captive rivet head 310. However, a portion of the first rivet member 904 provides a hole 912 therethrough.
The illustrated second rivet member 906 comprises a shaft 914, that is configured to pass through hole 912, and a protrusion 916. For convenience, the protrusion 916 is illustrated at the top end of the second rivet member 906 in this exemplary embodiment. Depending upon the specific type of captive blind rivet, this protrusion may be elsewhere on the shaft 914.
As described above, the capture channel 304 disposed on the captive rivet shank 908 allows a portion of the material 316 to be deformed into the capture channel 304 as described above, so as to secure the first rivet member 904 to the material 316. For convenience,
For convenience of illustration, the capture channel 304 illustrated in
Moreover, alternative embodiments employ other types of capture regions disposed on a captive rivet shank. These various capture regions are configured to receive a deformed portion of the material 316, thereby securing the captive rivet to the material 316 (
When the exterior surface 314 of the captive rivet head 310 is flush with the surface 1102 of material 316, movement of the exterior surface 314 and surface 1102 along the surface of another material is facilitated. Furthermore, the captive rivet head 310 will become embedded in the material 316 such that when used in certain environments, the captive rivet 302 will not move in an undesirable manner. For example, if the captive rivet 302 is used in an automobile, the embedded captive rivet 302 will not rattle or vibrate in an undesirable manner when the automobile is travelling on a bumpy or rough surface. Such undesirable vibration may have otherwise caused an undesirable sound, or may have resulted in premature fatigue and/or failure of the captive rivet 302 and/or material 316.
The process begins at block 1202. At block 1204, a captive rivet shank is inserted through a hole in the material. At block 1206, a captive rivet head is supported with a captive rivet anvil. At block 1208, a force is exerted on a portion of the material such that a captive rivet hammer causes a deformation of a portion of the material, wherein a deformed portion of the material is forced into a capture region residing on the captive rivet shank, thereby securing the captive rivet to the material. The process ends at block 1210.
Embodiments implemented in memory 712 (
Some embodiments of a captive rivet may be headless. In such embodiments, the captive rivet anvil (or another anvil) may cause deformation of the headless end of the captive rivet when the captive rivet hammer (or another hammer) applies force to the captive rivet, in addition to the forces deforming the upper portion 318 of the captive rivet shank 308 (
Captive rivets may be further categorized by the type of captive rivet head and/or the type of captive rivet shank. A universal captive rivet has a captive rivet head that extends above the surface of the riveted materials. A countersunk captive rivet has a captive rivet head that is configured to fit into a recess formed in an outer surface of the riveted material. Captive rivet shanks may be tubular or solid. A tubular captive rivet shank has a portion of the captive rivet shank removed such that a portion of the shank is hollow. The captive rivet shank may be semi-tubular wherein only a portion of the shank is hollow, or the captive rivet shank may be full-tubular wherein substantially all of the shank is hollow. Other captive rivet shanks may be solid. Also, solid or tubular captive rivet shanks may be split to facilitate rivet deformation.
It should be emphasized that the above-described embodiments are merely examples of the disclosed system and method. Many variations and modifications may be made to the above-described embodiments. All such modifications and variations are intended to be included herein within the scope of this disclosure and protected by the following claims.