US1153319A - Iris-diaphragm. - Google Patents

Description

R. KLEIN 11 T. BRUECK.

IRIS DIAPHRAGM.

APPLICATION FILED DEC.H,1914.

1,153,819, 7 P11811161 Sept. 14, 1915.

40 both internally and externally threaded,.the

UNITED. STATES PATENT OFFICE.

, RUDOLPH KLEIN AND 'rnnonon imunox, or noonns'rnn, NEW YORK.

IBIS-DIAYHRAGM.

Patented Sept. 14, 1915.

Application filed December 11, 1914. Serial No. 876,651.

To all whom it may concern:

Be it known that we, RUDOLPH KLEIN and THEoooR BRUnoK, of Rochester, in the county of Monroe and State of New York, have invented a new and useful Improvement in Iris-Diaphragms, which improvement is fully set forth in the following specification and shown in the accompanying drawings.

The present invention relates to iris diaphragms designed for use on photographic shutters, microscopes, lens barrels and other optical instruments and an object of the invention is to provide a construction which is inexpensive to manufacture both because of the employment of a fewer number of parts and because of the simplicity by which the parts may be assembled.

To this and other ends, the invention consists in certain parts and combinations of parts all of which will be hereinafter de scribed, the novel features being pointed out in the appended claims. I

In the drawings: Figure 1 is a view of the iris diaphragm constructed for use with a photographic shutter, the blades being illustrated as open; Fig. 2 is a view similar to Fig. 1 with the covering plate removed; Fig. 3 is a view similar to Fig. 2 showing the blades in closed p'ositions; Fig. 4 is a view with the iris plate and all of the blades except one removed; Fig.1.) is an enlarged sectional view, on the line area, Fig. 4, showing the manner of securing oneflend of each blade; and Fig. 6 is a central enlarged section through the device.'

Referring more particularly to the drawings, 1 indicates the support or casing of the device which is in this instance of annular form having an annular flange 2 projecting from the inner periphery, this flange being as covers for the unsightlyparts of the de-' vice. The support or casing is also provided with a seat 5 and an annular bearin 5 to one side of the seat 3 and on this hearing and seat the indicator ring 6 may turn. The indicator ring, in this instance, is provided with an arm 7 workmg through a curved slot in the support or casing 1 and having a pointer 9 at one end for traveling over a scale as is common in devices of this kind. This ring may have a central ofl'set annular portion 10 pressed laterally to one side of .the plane of the outer or bearing portion 6 of said ring, thus forming an annular shoulder 11 between the bearing portion 6 and the central portionlO. The portion 10 serves, in this instance, for pivotally ,connecting with the blades or leaves 12 which, may be each in the form of a segment of an annulus. At one end, each blade is formed with a pintle and this pintle is of such a construction that it interlocks with one of the bearings 13, the latter being formed by making an annular series of openings in the indicatorring portion 10. In this instance, this pintle comprises a tongue projecting from one end of the blade 12 and bent at an oblique angle at 1 1 and thence parallel with the blade at 15, the oblique portion being extended through one 'of the openings 13 so that its side edges form a bearing, and the parallelportion 15 being adapted to cooper ate with the face of the indicator ring opposite that on which the blade operates. With this interlocking connection between one end ofthe blade and the indicator ring, it is possible to readily introduce the pintle into the opening 13 of the indicator ring by a tilting movement'of the blade, and, after the blade is moved so as to lie substantially parallel with the indicator ring, there is no' tendency for the blade to become detached accidentally from the indicator ring.

The assembling of the blades of an iris diaphragm has been one of the most trouble-.-

some operations in the manufacture of these articles as it has been found that where the blade does not interlock with one of the parts of the shutter, it, in a great many cases, becomes detached while other blades .are being fitted in place, a slight wind effecting their derangement. This disadvantage is overcome by the-present improvement because the blades carry pintles formed withv lateral portions which cooperate with that face of the indicator ring opposite that on which the blades operate. Itis apparent, however, that the invention is not limited to arranging this pintle on either end of the blade it being merely necessary to provide an .interlocking connection which will hold one end of each blade against accidental displacement during the assembling of the other blades.

Shifting fulcrums are provided for the other ends of the blades on the iris ring or plate 18 which is supported on a seat 19 in spaced relation to the bearing portion 6 of theaindicator ring. Within this space lie the laterally extending lips 16 of the blades, said lips bemg slotted at 17 to receive pintles on the iris ring or late 18 The manner of forming these pint es and also the location of the same is novel. These pintles are formed by providing radial projections preferably on the inner periphery of the annular blank from which the iris .plate orring 18' is made. These projections are'bent laterally with reference to the iris ring 18 to provide the pintles 20 The pintles lie within the annular shoulder 11 in close proximity to the latter and in this way retain the slotted ends of the blades within the space between the indicator ring and the iris ring 18. As the pintles 20 are near the inner peripher of the iris ring it is possible for the assem ler,

when putting the iris ring in place, to prop-' erly and easily position the slotted ends of the bladesso that the pintles may be easily passed into the slots. f desired, a covering plate 21 may be fitted over the\ iris plate, and the casing or support for the iris diaphragm ma serve as a cover or cap for a photographic shutter.

7 According to this invention, the blades are assembled in the device by interlocking one end of each to the ring which, according to the construction is most advantageously situated for this purpose. In this instance, this ring is the indicator ring. I After all the blades have been interlocked with the indicator ring, the iris ring is placed over them, the position of the pintles at the inner periphery of the iris ring making'it possible to see clearly Whether the pintles are entering the slots in the blades, and also to see the blades to manipulate them.

What we claim as our invention and desire to secure b Letters Patent is:

1. An irisdiaph'ragm comprisin -aniris ring, a rotary indicator ring, an blades, one end of each blade having a shifting fulcrum on one of said parts, and the other end of the blade having a pivotal interlocking connection with the other of said arts to prevent accidental displacement oft e blade durin assemblin Q 2. n iris dia iragm comprising an iris ring, a'rotary'in icator ring, lades, a shiftable fulcrum connecting each blade with one of the first two named parts, and a pivotal connection between each blade and the, other of the first two named parts, the pivotal connection embodyin erally from one o the parts which it connects, extending through'the other of said extends.

port, an indicator rin a pivot pro ecting lat-' connected parts and having a portion 00- operating with the opposite face of the part throu h which it extends.

3. iris diaphragm com rising an iris ring, a rotary indicator ring, lades, a shiftablc fulcrum between one end of each blade and one of the first two-named parts, and a pintle projectin laterally from ea'chblade and extending t irough the other of the first two-named .parts, said pintle having a lateral extension to cooperate with the o posite. face of the part through which the pmtle 4. An iris diaphragm comprisin an iris ring, a rotary indicator ring provi ed with an annular series of openin s, blades, a shiftable fulcrum between each lade and the iris ring, and a pintle extending from each blade through one of the openings of the indicator ring and having a lateral extension at one end adapted to cooperate with the oppo site face of the ring.

5. An iris diaphragm comprising a supon the support and hav1ng,an annular series of circular openings,.a plurality of blades; each having a pintle at one end extending obliquely to the plane of the blade throug mounted to rotate one of the openings of the indicator rin said pintle having an extension parallel wit the blade to engage the opposite face of the indicator ring, an iris ring, and a shiftable fulcrum connecting eaeh blade with the iris rin l 3 6? An iris diaphragin comprising blades each having a slotted portion, an indicator rin to WhlOh said blades are pivoted, said indlcator ring having a bearin portion and a central annular portion 0 set from the bearing portion to provide an annular shoulder, the blades being pivoted to the central annular portion, an iris ring spaced from the bearing portion of the indicator rin and having the slotted portions of the blades lying in said space, and pintles ,projecting from the iris ring through the slotted portions of the blades and within the annular shoulder of the indicator ring to overhan suchshoulder and thus retain the bla es in the space between the indicator ring and the iris ring. I e

7. An iris diaphragm comprising blades each having a slotted portion, an indicator ring to which said blades are pivoted, and an iris ring having laterally extending pintlesarranged at the inner periphery of the ringv and .projecting through the slots of the blades.

8. Aniris diaphragm comprising blades each havin a slotted portion, an indicator ring to whlch-said-blades are pivoted, and

anlris rin formed from an annular blank having ra ially extendin ton es at one edge thereof bent lateral y an extendmg through the slot ofthe blades.

being also pivotally connected to the other 7 g RUDOLPH KLEIN.

THEODOR BRUECK. Witnesses:

H. H. SIMMS, ADA M. WHITMORE.

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