DE389063C - Fire protection device for standstill kinematograph - Google Patents

Description

(MT ₇ 405

The invention relates to a fire protection device for cinematographs to the film with slow movement or temporary standstill against the risk of ignition to protect. Switch on grilles or heat shields for this purpose, is known in and of itself.

The novelty of the invention is that such, in a known manner

ίο swiveling, transparent by means of the centrifugal governor Heat shield together with a closure, also known per se, whose spring action against its axis brought to collapsible wings by centrifugal force in their effective closed position and are held in this, are arranged so that when the protective screen is switched on the shutter wings are folded up with the protective screen switched off

jo, on the other hand, the wings cut through the beam path. Another characteristic is the bending of the ends of the clasps Wings, which should help, with normal rotation, the wings in the effective To keep locked position. In the case of locking disks with fixed wings, it is known to have these to provide bends so that they act as fans and the shone through - that is, at risk - supply a cooling air stream to the piece of film.

In the drawing, the subject of the invention is in one embodiment shown, namely is

Fig. Ι a plan view of the projection device with removal of the upper housing for the coils;

Figure 2 is a section along 2-2 of Figure 1;

Fig. 3 is a side view of a portion of the projection machine looking towards FIG Seen arrow 3 of Fig. 1;

Figure 4 is an end view taken on line 4-4 of Figures 1, and

Fig. 5 shows a detail view of the closure from the front in the direction of the arrow 5 seen. "

On the housing 1 is a housing 4 for Spool of the film to be wound up and a housing 6 for the spool of the to be wound up Films attached. The drive shaft / mounted in the housing 1 drives through bevel gears 18, 23 the vertical shaft 24 on which a regulator 26 is seated. A worm gear 9 on the Shaft 7 drives worm shaft 10. The worm shaft is driven by a control disc and a ratchet wheel 12 continues to drive the film indexing device a flywheel 17 and through spur gears 53, 52 the movement is transmitted to a shaft 50, who wears the clasp. On the end of the shaft sits, as shown in Fig. 2 and 5, a central web 54 on which a pair of plates 55 are hinged, the opposite Sides - protrude from the middle bar. The panels are held by coil springs 59 pulled together, which engage pin 58 of the plates. When the shaft 7 rotates, the shaft 10 the shutter shaft 50 rotates, and thereby the plates 55 are thrown outwards, to come approximately in a plane at right angles to the shaft 50. The arch parts 63 of these plates come from time to time So lying in front of the lens opening through which the image is projected is dazzling intermittently the light coming from the light source, namely this dimming takes place in a known manner in time correspondence with the switching movement of the film instead of.

The heat shield 41, which consists of a frame 44 and a glass plate 45 held therein, is in the normal rotation of the shaft 7 in the position shown in full lines, Fig. 1, in which it does not interrupt the light rays. The frame can swing out about the vertical pin 42 and is connected by a member 40 and a slide 30 to an angle lever 36, which in turn is connected by a member 35 to a lever 32, which is articulated at 31 on the housing and with; its free end engages in a groove 29 in the regulator sleeve 28. When lifting the socket, | ie at normal speed, therefore ■ the downwardly protruding end of the angle lever 36 is moved to the right and thus the heat shield 41 swings out into the open position, while with slow movement the regulator sleeve is shifted downwards and the disk 41 into the dashed lines ( Fig. 1) is brought into the position shown, in which the light rays penetrate through the glass plate before they hit the film. If the movement is too slow or if the shaft 7 is at a standstill, the movement of the shaft 50 is changed accordingly, and the springs 59 pull the plates 55 into the folded, ineffective position shown in dashed lines. The screening arches 63 then no longer lie in the path of the light beam emerging from the lens. This pull on the wings of the shutter prevents the arches 63 from shading the projection screen when the rotary movement is uninterrupted. The arcs are bent at the ends at 65 in order to help keep the plates 55 in the closed position and to press them against the central web 54 when the plates 55 are rotated. A film indexing roller 21 is also driven by the gearwheel 18 of the shaft 17, and further indexing rollers 14 and 60 are rotated by the shaft 13 and the vertical shaft 24 in order to unwind the film from a spool and to pass it in front of the image window 48 between plates 48 "* and to wind on the other, with the usual loops are provided to compensate for the film motion between the switching roles - - '■ ■■ .-:. - _go ·

Claims (2)

Patent Claims: 1. Fire protection device for standstill kinematographs, characterized in that a known per se, pivotable by means of a centrifugal governor, transparent Heat shield (41) and a lock with also known Way collapsible under spring action against its axis and through Centrifugal force in their effective closed position held wings (55) so arranged are that when the .safety disk is switched on, the locking wings are folded up are, on the other hand, when the protective screen is switched off, the wings cut through the beam path. 2. Apparatus according to claim 1, characterized in that the collapsible Plates (55) with deflectors (65) are equipped to the plates for usually under the influence of centrifugal force against the central web (54) press and thus secure in the extended position. 1 sheet of drawings.