Fastening device

• US 4,508,477 A
• Filed: 09/30/1982
• Issued: 04/02/1985
• Est. Priority Date: 09/30/1982
• Status: Expired due to Term

• Current Assignee: TransTechnology Engineered Components, LLC
• Original Assignee: Eaton Corp. (Wisconsin) (Eaton Corporation PLC.)
• Inventors: Rattmann, Hans R., Oehlke, Donald N., MacRae, Ralph A., Crammond, James
• Primary Examiner(s): Holko, Thomas J.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/430,449
• Time in Patent Office: 915 Days
• Field of Search: 411/437, 411/436, 411/527, 411/172, 411/173, 411/174, 411/175, 248/73
• US Class Current: 411/174
• CPC Class Codes: F16B 37/041 Releasable devices F16B37/044, F16B37/045 take precedence

Abstract

Disclosed is an improved fastening device (70, 72, 74, 76, 78) for securement of a threaded member such as a screw ("s") to an article such as a panel or the like. The device is of the type having a base member (12) having a frusto-conical projection (14) having a lower and higher helical edge (16, 16a) surrounding an opening (40, 42'"'"') therethrough which in conjunction with a pair of resilient finger portions (30, 32'"'"') having respective free-ends (34, 36) spaced-apart from each other along an axis ("y--y") defined therebetween of which one finger portion is displaced a distance ("x") further from the base member than the other finger portion to provide a means of engaging the threads of the threaded member. Edges (16, 16a) are separated from each other by means of a slot (38) which, by extending beneath the finger portion having the higher free-end in a direction substantially transverse to axis "y--y", is able to prevent cocking and cross-threading of the threads of the threaded member which has been a problem in the past particularly when the threaded member has a blunt rather than a pointed end.

Claims

1. An improved fastening device (70, 72, 74, 76, 78) for securement with an externally threaded member ("S"), said device of the type having a base member (12), an aperture (40) through the base member for receiving the threaded member, thread engaging means defined by marginal portions (16, 16a) of the aperture which extend outwardly from the base member for engagement with a lower surface (62, 62a) of a thread of the threaded member when initially inserted through the aperture, a pair of resilient finger portions (30, 32) made integral with and extending upwardly and angularly inwardly from the base member on opposite sides of the aperture, said finger portions extending radially inwardly towards one another in overhanging relationship relative to the thread engaging means and having free-ends (34, 36) respectively thereof that are spaced-apart from each other along an axis ("y--y") defined therebetween and are axially off-set relative to one another such that the free-end of the one of the finger portions is higher than the free-end of the other finger portion relative to the base member, said thread engaging means including an upwardly projecting generally frusto-conical projection (14) defining upper and lower generally helical edges (16, 16a) separated by a slot portion (38) formed radially relative to the aperture in the base member, said space between the finger portion free-ends and said base member aperture edges dimensionally adapted so that, upon turning the threaded member through the aperture, a force is imparted by the threaded member to intially draw the edges downwardly and axially into engagement with the lower thread surface and pivot the finger portions radially inwardly into engagement with an upper surface (60, 60a) of the threaded member so that a counter-force is imparted by the threaded member to pivot the finger portions in generally opposite directions and draw the edges downwardly and axially inwardly to urge the finger portions and the edges into tight gripping engagement with the root portions of the threaded member with the axial distance between corresponding axially aligned on the edges and the free-ends of the finger portions substantially greater than in the intially installed position thereof, said improvement characterized by the slot portion extending radially outwardly from the aperture along the base member and thence along the finger portion having the higher free-end relative the base member in a direction that is substantially transverse to the axis defined between the finger portion free-ends to provide the device with improved ability to receive and effectively secure the threaded-member without cocking or cross-threadably engaging the threads thereof.

2. The fastening device of claim 1, wherein the base member has a resilient arm bent downwardly therefrom and extending angularly upwardly in the general direction of the base member to an end thereof that is spaced-apart from the base member for a distance sufficient to enable the arm to coact with the base member to provide a clip for attachment of the device to an article dimensionally capable of being received by the clip.

3. The fastening device of claim 2, wherein the arm includes an opening disposed below and substantially coaxially aligned with the aperture in the base member for receiving the threaded member therethrough.

4. The fastening device of claim 3, wherein the opening has a warped edge deformed to provide engagement with marginal portions of an aperture through the article through which the threaded member is to be inserted.

5. The fastening device of claim 2, including a warped portion of the arm that extends angularly upwardly from the arm in a direction towards the intersection between the arm and the base member and is dimensionally adapted to enhance the securement of the device to the article.

6. The fastening device of claim 5, wherein the warped portion includes an opening disposed below and substantially coaxially aligned with the aperture in the base member for receiving the threaded member therethrough.

7. The fastening device of claim 6, wherein the opening has a warped edge deformed to provide engagement with marginal portions of an aperture through the article to which the threaded member is to be inserted.

8. The fastening device of claim 1, wherein the base member has a generally flat configuration that is adapted to be disposed within a generally polygonal shaped opening in an article through which the threaded member is to be inserted, said base member having at least one pair of flanges that project outwardly from a juncture point with the base member on opposite sides thereof and are adapted for engagement with the article to which the device is to be secured.

9. The fastening device of claim 8, wherein the base member is cut out adjacent the juncture between the flanges and the base member to provide a projection for engagement with marginal edges of the article opening to prevent laterial shifting movement of the device when in assembled position with the article.

10. The fastening device of claim 1, wherein the finger portion free-ends are axially displaced one from another for a distance that is substantially the same as the pitch of the threads of the threaded member.

11. The fastening device of claim 1, wherein the finger portions are tapered in such a manner as to enhance the respective flexibility thereof with respect to the base member to the degree desired.

12. The fastening device of claim 2, wherein the arm and the base member are tapered in such a manner as to enhance the flexibility therebetween to the degree desired.

13. The fastening device of claim 5, wherein the warped portion is tapered in such a manner as to enhance the flexibility thereof with respect to the arm to the degree desired.