Patent GB-191210724-A (GB)
Title: Improvements relating to Focussing Magazine Cameras.
Inventor: HANSEN JENS PETER
IPC: G03B17/42
Filed: 1912-05-06
Granted: 1913-05-06
Abstract: 10,724. Hansen, J. P. May 11, 1911, [Convention date]. Magazine hand cameras with compound change; with connected action between shutter and changing - mechanism; focusing - arrangements in; sheaths and plate-holders for.-The plate-changing mechanism works in conjunction with the focusing-screen, hood, and shutter in such a manner that on turning the operating- knob 24, Fig. 1, for an exposure, (1) the lens shutter is closed; (2) the focusing-screen frame 5, 6 is moved to the rear; (3) the focusing-hood 37 is closed; and (4) the lowest plate 9 swings down into the focal plane. After exposure and when the knob 24 is turned back, the plate swings face downwards on to the base of the camera 2 before the focusing-screen is moved forward. The shutter is closed, on operating the knob 24, by the arm 27, which moves a lever 28 against the action of the spring 46. The lever 28 carries an arm c, Fig. 1<a>, which tilts a lever e and releases the slide f holding the shutter open. The focusing - screen frame 5, 6 is mounted on two slides 10 connected by a cross-piece 11. The slides 10 are moved back on turning the operating-knob 24 by the arm 25. The slides 10 also carry two springs 16, which engage behind the rear pins of the lowest plate sheath 9 and move the pins into slots 18 formed in two side frames 17, and which form bearings for the pins 15 and the sheath 9, which swings down when the front pins 15 clear the ledge 20. After an exposure, and on returning the knob 24, the upper pins 15 are released from the prongs 16, and the lower pins 15 slide down the slope 31, the plate falling face down at the bottom of the camera. The shutter is reopened by hand for focusing. The focusing- hood 37 is maintained in the extreme open and closed position by a spring, and is opened by turning a rod 8. The camera is fitted with a rising and falling front 39. In a modified construction for supporting the unexposed plates, the front pins 15 rest on a ledge 57, Fig. 10, on the change-slide 10. On shifting the slide for an exposure, the ledges 57 release the pins of the bottom plate and a second ledge 58 comes underneath the second plate to retain it. On returning the slide after an exposure the lowest plate drops again on to the ledges 57. The plate-sheaths 9, Fig. 5, are formed with the shaped channels 12, 13 which are filled with resilient packing 14. In adapting the shutter arrangement to a camera with an extending front, the link 28, Fig. 8, is formed with a pointed end, and closes the shutter by engaging a toothed slide 60 which slides on the racking side-stays 46 supporting the camera front. The slide 60 actuates the shutter through a bar 50, and is returned to normal position to open the shutter, after an exposure, by a spring 48. In a further modification for a camera having a swinging front, the link 28 controls the shutter through a Bowden wire connexion. The Specification as open to inspection under Section 91 (3) (a) comprises also the construction shown in Fig. 12 (Cancelled), for tilting the lens front of a camera. This subject-matter does not appear in the Specification as accepted.