Sinar Ag Schaffhausen

Peter Datwyler

Karl Gfeller

Hans-Carl Koch

A coupling device for attaching frame-shaped accessories to photographic equipment which includes an annular rib (32) projecting in the axial direction with an annular collar projecting radially outwardly that continuously extends over 360.degree. and has conical guide surfaces (33A, 33B) at one axial end surface of a first frame-shaped accessory (20, 60) to be coupled. Another accessory (60, 20) to be coupled has at one axial end surface several supports (65) projecting parallel to the axis which are somewhat elastically flexible in the radial direction, with claws (67) that are pointed radially inwardly. The supports (65) and the claws (67) of one accessory (60) are formed and attached in such a manner that the claws (67) can be connected to the annular collar (33) of the other accessory (20) in a coupling grasp and can be disconnected again from the annular collar (33), whereby the claws (67) glide over the conical guide surfaces (33A or 33B), the supports (65) being somewhat flexible and elastic. The accessories to be coupled are, e.g., a filter-supporting frame (20) and an end frame (60) of a bellows (61) to shield against undesired light rays.

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Diessenhofen, Switzerland

Peter Datwyler