DE69227C - - Google Patents

Description

IMPERIAL

PATENTAM

The innovation relates to photographic shutters according to the system of the iris diaphragm and consists in the fact that the ring R, which mediates the joint movement of the small plates P arranged around the opening O , does not move directly with the rod L of the air pressure, as in the known constructions Piston IC is connected, but that this connection is accomplished by inserting the angle lever W and the joint G. The purpose of this arrangement is to make the present shutter usable for snapshots as well as time recordings.

While in the older constructions the movement of the piston K in one direction caused the opening and the backward movement the closing of the lock, in the present construction the opening and closing are effected by a single movement of the piston in one direction. This is done in the following way. A pin i is screwed into the ring R and protrudes through a slot s from the cover plate. This is captured by the joint G, which forms an angle with the lever W. If the piston K is now displaced towards the center of the cylinder, the parts W and G assume a stretched position and in doing so push the pin i to the right-hand end of the slot. When the piston is pushed further, W and G again form an angle in the opposite direction, and this causes pin i to move to the left again. Since the ring R, and thus also the locking plates, participate in the movement of the pin i , every displacement of the piston causes it to move from one end. of the cylinder, on the other hand, an opening and closing of the lock. It is therefore not necessary to pull it up.

If the shutter is to be used for time recordings, then the lever A is turned to the position shown in dotted lines. Then the lever W is caught halfway through its path. The shutter remains open and does not close again until the piston retracts. In this case the lock works in the same way as the older constructions.

For compression respectively. The air located under the piston K is diluted by a similar but somewhat larger metal cylinder with a fitted piston, which is moved by hand by means of a ring attached to the end of the piston rod. Both cylinders are provided with attachments for receiving a hose through which the compressed air is transferred from one to the other.

Fig. 2 shows a modification which is intended to operate the shutter, instead of the apparatus just described, using the rubber pear which has become common in photographic practice. The following device is used for this purpose: The pin i inserted into the ring R is connected by the joint g to the angle lever W which can be rotated about d and which is rotated to the left by the spiral spring f. At α and b this lever is provided with lugs bent up at right angles. If now the piston K driven forward, the end stöfst the pressed through a ¹ spring always right

Sf

Λ

Piston rod L against the tab α and thus turns the angle lever to the right. As a result of this rotation, however, the second tab b pushes the piston rod to the side and forces it to slide off α. This happens at the moment when the pin i has reached its outermost position on the right, i.e. the shutter is completely open. At the same moment, however, when the piston rod slides from a , the lever W is turned back to its left position by the spring / and the lock is closed again. Every pressure on the rubber bulb connected to the hose causes the closure to open and close immediately.

The locking hook / j, the support lever ρ and the eccentric e are also arranged for the purpose of using the lock for time recording. In the case of snapshots, these parts do not come into consideration, since the locking hook h is then pressed so far to the right by the eccentric e that it cannot grasp the nose η of the angle lever W. For time recording, turn the lever of the eccentric e from χ to ^; as a result, the ratchet h moves further to the left, with the result that when the angle lever W is rotated, the lug η thereof is caught by the ratchet and the lever is thereby prevented from retreating; the lock remains open. If you now press the rubber bulb again, the piston rod, which came under the support lever ρ while sliding down, pushes it upwards, thereby the locking hook is forced to release the nose η of the lever W , and this is in again by the spring f its initial position is withdrawn and the shutter is closed again as a result. In the case of time recordings, the shutter is opened by the first pressure on the pear and closed by a second.

Claims (1)

Patent Claims: ι. A sector closure for momentary and time exposure, which without preceding Clamping is actuated exclusively by air pressure, characterized in that the ring (R) which mediates the movement of the locking plate, which is driven by means of an angle lever from a stamp (L) moved by air pressure, executes a back and forth movement, while the stamp only moves in one direction Direction is moved, the rotation of the ring causing the angle lever in the opening position of the lock. can be locked by a locking device. An embodiment of the by claim ι. protected lock, in which one arm of the angle lever (W) is rotatably attached to the piston rod (L) , the other arm is connected to the ring (RJ by a rod (GJ) in such a way that the rod and the lever arm connected to it form one Form toggle levers that cause the ring to go back and forth (momentary exposure) for a full piston stroke, while for half a piston stroke the shutter is fully opened and in this position by a rotatable arm (A) until the piston retracts is held. An embodiment of the by claim ι. protected closure, in which the piston rod (L) hits a projection (a) on the angle lever and the latter takes with it until the closure is completely open, whereupon a second projection (b) removes the piston rod from the. first projection so that the angle lever is returned by a spring (f) , in which a locking lever (h) is also arranged to bring about time exposure, which can be brought into such a position by an eccentric disk (e) that it prevents the angle lever from going back until, on a second piston stroke, the piston rod hits an arm (p) rotatably connected to the locking lever, whereby the locking lever is rotated and the angle lever is released. For this purpose ι sheet of drawings.