Preassembled fastener unit for clamping plastic workpieces
US4193434A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 10, 1978 |
| Grant date | Mar 18, 1980 |
| Priority date | — |
| Expiry date | Aug 10, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B39/26
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A preassembled bolt and washer-like device designed for use in securing an upper, plastic-like workpiece to a lower support structure so that cold flow of the plastic is minimized while applying a relatively high clamp load to the joint. The washer includes a tubular sleeve having radially inwardly directed protuberances at the upper region of the inner wall designed to snap onto the shank of the bolt and be axially retained and free spinning therein. The upper extremity of the shank of the bolt includes a radial outward protuberance cooperating with the protuberance on the sleeve. The threaded region of the shank extends within the confines of the sleeve so the thread runout at the upper extremity of the shank will not prevent the sleeve from clampingly engaging the lower support structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.