Method of manufacturing overshoes
US4847934A · kind A · utility
Inventor
Key dates
| Filing date | Dec 24, 1987 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Dec 24, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C66/1142
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of manufacturing overshoes made from an elongated rectangular flexible sheet of material. The method comprises the following steps: (a) gathering the sheet material by parallel stitching two elastic strips on the opposite side edge portions respectively of the sheet; (b) folding the sheet in two along its longitudinal center line, so as to bring the two gathered side edge portions in respective abutting register; (c) with an ultrasonic press, weakening narrow sections of the sheet transversely to the axis of the longitudinal center line, at regular intervals, and concurrently cross-bonding the sheet along both edge portions defined by each one of the weakened narrow sections of the sheet; and (d) detaching the desired segment of sheet of material along the line of bonding, for any one overshoe. Also, the products obtained by the above-described method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.