Collapsible binocular instrument
US4013341A · kind A · utility
Inventor
Key dates
| Filing date | Feb 4, 1976 |
| Grant date | Mar 22, 1977 |
| Priority date | — |
| Expiry date | Feb 4, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A low cost compact folding binocular which collapses for storage to a relatively thin package and which includes the customary focus and interpupillary distance adjustments. A pair of complementary housings comprising an objective lens section and an ocular lens section provide a pair of laterally spaced column portions adapted to be mutually slidably engaged in telescoping relation. A retractable or removable lens holder element having a lens secured thereto or integrally formed therein is attached to one end of each of the column portions. A central web portion joining at least one of the pairs of laterally spaced column portions and fabricated from a flexible material permits the lateral spacing of the column portions to be manually adjusted to provide the interpupillary adjustment. Focus adjustment is provided by the telescoping relationship between the column portions of the two sections. A biasing spring or strip of unitary springlike material automatically extends each retractable lens holder element to the viewing position when the instrument is unfolded. Alternatively, each lens holder element is provided with a pull tab to enable manual extension thereof. The removable le…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.