US1227991A - Camera-shutter-operating device. - Google Patents

Description

J. BARNETL CAMERA SHUTTER OPERATING DEVICE.

APPLICATION FILED MAR. 18.1916.

Pateflted May 29,1917.

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MORRISSON J. BARNETT, or Los anennnscnmronnrn, ASSIGNOR To EBER BEAULIEU,

' or ALDERPOINT, CALIFORNIA. p I I v 'cAMnRA-sHuTrrnR-OPERATING DEVICE.

Specification of Letters Patent. P t t d May 191% Application filed March 18, 1916. Serial No.. 85',0 98.

To all whom it may concern: v

Be it known that I, MORRISSON J. BAnNE'rT, a citizen of the United States, reslding at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Camera-Shutter-Operating Devices, of which the following is a specification.

This invention relates to lmprovements in a longitudinal sectional view of the timer in the position in which itis ready for locking, and therefore ready to be engaged'by a cable release; Fig. 2 is an end view of the same; Fig. 3 is a broken side view of the same,'collapsed; Fig. 4 is a side view of the same taken at right angles to Fig. 3; Fig. 5 is a broken side view of a cable release; Fig. 6 is,

a side view of a locking ring.

Referring to the'drawing, 1 indicates a cylindrical casing closed at one end by a head 2 and open at the other end, a pin .3 extending transversely through holes in the casing adjacent to its open end. A tubular traveler 4 within the casing can slide through said open end, said tube being closed at the end Within the casing by a head 6, there being secured to said head by a screw 7 and a washer 8 a cup leather 9 or a cupshaped washer of other flexible material,

thereby rendering the chamber 10 between the heads 2 and6 air-tight, When, however, the traveler is drawn out of the casing, as shown in Fig. 1, air is able to enter the cham ber 10 between the two heads by means of a slight depression 11 in the inner surface of the casing, which extends a short distance on both sides of the cup leather 9.

The traveler is limited in its outward movement by reason of the pin 3 engaging the inner ends of two diametrically opposite longitudinal slots 12 in the tubular traveler, the inner ends of said slots extending transversely to their main direction, as shown at 13, and the traveler adjacent to said transverse extension being formed with slight points or books 14, so that the inner end of each'slot is vsomewhat'of the character of a bayonet slot; Stationarily secured within said tubular-traveler by means of said in- 3 is a cylindricalabutment 16 between whlch and the head 6 is compressed a coiled spring 17. I 1 For the purpose of illustratingmy invention, I haveherein shown a release rod 18 connected to a cable 1910f a camera shutter,

said release rod extending through a head 21' of a casing 22.- Said head 21 is moved through theopen end'of the'tubular traveler 4 until it isarrested'by the inner surface-of a circular groove, 23 formed aroundqsaid tubular traveler. It is then looked in thatposition by means-of a locking ring 24, which extends around the terminal portion of the tubulartraveler in front of the head 21, and. comprises a circular portion surrounding said tubular. traveler opposite to slots 26 cut therein on opposite sides. Said ring comprises also a narrow rectangular extended portion 27 sojthatby moving said ring transversely across the tubular traveler, the sides of said rectangular extension 27 can pass through said slots 26 in the tubular traveler into theinterior thereof and lock the head 21 of the casing of the release rod in the tubular traveler, in a position in which it fits snugly against thefinner surface of the groove 23. At thistime, the release rod 18 is contained within the tubular traveler 4 and isadaptedi to be engaged by the side of in an enlarged hole 34 coaxial, and com--- municating, with the vent hol'e'31. To the outer end of the threaded stem is secured a spring metal arm 36 formed with an indenture 37 extending toward the head 2 of the casing, and adapted to enter any one of a circular series, concentric with the head, of holes 38, the movement of the arm being limited by two stop pins 39, 40, driven into said head. By moving the arm in one direction, the screw is drawn outwardly 110 thereby enlarging the passage by which the air can pass through the hole 31 and by screwing it in the opposite direction the passage is contracted. It is evident by this arrangement any desired speed of movement can be given to the air escaping from the chamber 10.

The operation is as follows :The parts being in the position shown in Figs. 3 and 4, the tubular traveler-is drawn outwardly, compressing the spring to the condition shown in Fig. 1, and is then turned, thereby locking the tubular traveler by means of the pin 3. The head 21 of the casing of the release rod is then looked to the outer end of the tubular traveler in the manner before explained. The device is then ready for actuation. To actuate the device the casing 1 is turned relatively to the tubular traveler 4.- so as to release the tubular traveler from the restraining action of the pin 3. The spring 17 then immediately acts to move the tubular traveler 4 inwardly into the casing 1. This movement is rapid for a short distance until the air is compressed Within the casing. At about this time the head 21 of the release rod 18 is moved up against the stationary abutment 16 and its further movement is thereby arrested. Since the casing 22 of the release rod, however, still moves with the traveler, the release rod itself moves relatively through the casing from right to left, when the parts areas shown in the drawing. The duration of this movement is limited by the size of the opening through the vent hole 31 past the needle valve, which can be varied as desired by rotating the arm 36.

I claim :i

1. In a device of the character described, a cylinder closed at one end and open at the other, said closed end having therein a circular series of recesses, a traveler traveling in said cylinder, means carried by the inner end of the traveler for forming a movable air-tight partition across the cylinder, a spring acting to move the traveler toward the closed end of the cylinder,

means for securing an actuating device to the other end of the traveler, the closed end of the cylinder having a vent hole therethrough, a needle valve screwed into said closed end and controlling said vent hole, and a spring arm secured to the outer end of said needle valve, and having means for engaging any one of said recesses.

2. In a device of the character described, a cylinder closed at one end and open at the other, a tubular traveler traveling in said cylinder, means carried by the inner end of the traveler for forming a movable air-tight partition across the cylinder, a spring acting to move the traveler across the closed end of the cylinder, said closed end having a vent hole therethrough, a needle valve screwed into said closed end and controlling said vent hole, the outer terminal portion of the tubular traveler having a contracted portion, and the sides of said tubular traveler, outside or beyond said contracted portion, being slotted, and a locking ring transversely movable in said slots and having a contracted portion for locking in said traveler the head of a release rod casing.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

MORRISSON J. BARNETT. Witnesses:

FRANCIS W. WRIGHT, D. B. RICHARDS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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