Browse Prior Art Database

Self Locking, Nonmagnetic Screw

IP.com Disclosure Number: IPCOM000089433D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

De Illy, JB: AUTHOR [+2]

Abstract

This screw is particularly useful in electromagnetic actuators where it is necessary to provide an adjustable, self-locking, nonmagnetic stop for means such as a movable armature.

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Self Locking, Nonmagnetic Screw

This screw is particularly useful in electromagnetic actuators where it is necessary to provide an adjustable, self-locking, nonmagnetic stop for means such as a movable armature.

The screw of Fig. 1 is molded of a plastic, nonmagnetic material, and includes a lead-in section 10 having full, 360 Degrees threads. The screw's major length 11 includes a continuous, axially extending ridge 12 on the minor diameter which interrupts each thread to form a locking member, as the screw is advanced into a threaded hole beyond section 10.

Fig. 2 is a section view of the screw, taken along line 2-2 of Fig. 1. Reference number 20 identifies the screw thread's major diameter, whereas 21 identifies the thread's minor diameter.

Fig. 3 shows the mold by which this screw is formed. hold halves 13 and 14 are first formed with conventional screw threads. The mold corners 15 and 16 are then ground off to produce the mold surface for the screw's ridge 12. Mold surface 17 establishes the screw thread's minor diameter, whereas mold surface 18 establishes the thread's major diameter.

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