US1848523A

US1848523A - Leo goldhammer

Info

Publication number: US1848523A
Authority: US
Publication date: 1932-03-08
Anticipated expiration: 1949-03-08

Description

Mar-ch 8, 1932.

PHoToGRAPHIc SHUTTER` Filed Qot. 8, 1929' i zsheets-sheet 2 Z 4 lllllh L. QOLDHAMMER 1,848,523

Patented lMar'. 8, 1932 UNITED sTATEs PATENT OFFICE Lao eonnnamma, or MUNICH, GERMANY, assIGNoa 'ro nera' misco concurren. or nmenan-'romnnwyoam a coaroaa'rIoN or NEW' Yoan A PHOTOGBAPHIC SHUTTEB ,AApplioation led October 8, 1929, Serial No. 398,248, and in Germany October 8, 1828.

My present invention relates to photographic shutters and more` particularly to shutters, the bladesof which 'are automatically tensioned and released by pulling the .r operating lever downwardly. Y

One of its objects relates to the bearing of the operatin lever of the'shutter.

Another o ject of m invention is to coordinate the operating ever with the spring actuated shutter blades in such a manner that the shutter is tensioned and opened directly by a cam on anotherjpart of the operating lever.

A still further object of my 'invention is 1G to provide an operating lever which when adjusting the shutter to time opens directly the locking device of the b ades, without need of a separate lever as hitherto required. Y Other objects and advantages in details of construction and operation will be apparent as the description proceeds' reference being hadv to the accompanying-drawing wherein n n n n l like reference numerals indicate like parts.

Fig. 1 isan interior view of my shutter.

Fig. 2 is a view similar to Fig-1 showing the shutter parts in a position they occupy when tensioned ready lfor-:exposure with closed blades.

-So Fig. 3 is a view similar to Figs. 1 and 2 illustrating the shutter while stantaneous exposure..

effecting `in- Fig. 4, likewise, is a View similar to Figs.

- 1 and 2 illustrating the shutter while effect- -ter and may Referring more particularly to the illus- Fig." 5 comprises an arm 6 and a plate 5v with curved margins and with an annular opening capable to embrace the cylindrical rotary position. By a s rin 9 anchored-with one end to the casin 1t is eld in its initial position shown in ig. 1.A

,- 10 and 11 are'the shutter blades. The blade 10 is rotary mounted on the blade 11 with a pin 12, while .the blade 11 is givoted on a pin 13 in the shutter casing. prings l14 and 15 tend always to holdthe

blades

10 and 11 in the closed position seen in Fig. 1.

y holders 7 se- The

blade

1,0 is provided with a bent la 16, y

whichstrikes an angular shoulder 17 o the blade 11, if the shutter is closed.

On the annular operating lever 5, a cam 18 is fitted so as to be rotary Vround a bolt'19. v

The external edge of the said cam 18 is bent rectangularly, so that a ilap 20 of the'cam projects backwards and abuts against a pin 21 mounted on the blade 11, when the operating lever is turned. The cam 18 ispressed against the cylinder wall 2 by the action of the spring22. i

23 is a locking lever or ratchet pivoted in the shutter casing and pressed by the spring 24 against the pin 25. The' pin 25 is connected'with a re lating device outside the shutmoved to and fro radiallyin' the shutter'casing, vwhereb the position Vof the ratchet 23 is altered. rom the ratchet 23 a pin 26 projects through a slit provided in the intermediate piece 4, so that it may come in contact with the curved margin 27 of the operating lever 5.

'Ehe shutter operates as follows: In normal position, all parts of the shutter are situatedas seen in Fig. 1. If the o eratingarm 6 isdepressed downwards, t'e plate 5 and the cam 18 connected therewith are turned round the central flan e 2psurrounding the shutter opening 3. e free p end 20 comes in' contact with the pin 21 and thus swings'the shutter blade 11 about its pivot 13. v The shutter bladelO, being pivotedon the blade 11 and striking with its bent vlap 16 against the angular shoulder 17 of the engagement with the nose at the front part of the ratchet 24, while the blade 11 strikes with its angular shoulder 17 the bent lap 16 of blade 10. This is shown in Fig. 2.

The exposure now is accomplished through a. further movement of the operating arm 6 in downward direction, by which the nose 20 of the cam 18 slides away from the pin 21 and sets it and therewith the shutter blade 11 free. The blade 11 swings back in its initial position b v the action of the spring 14. whereupon the pivot 12 performs a circular way on account of its eccentric position regarding the pivot 13. Thereby, the blade 10 undergoes a downward movement and the l shoulder 16 of the blade 10 slides away from the nose of the ratchet 23 until it leaves the action of the latter and snaps back by the action of the spring 15 in its initial position. Fig. 3 shows the shutter while the obiective opening` is partly opened for instantaneous exposure.

The duration of exposure. obviously. is iniuenced bv the placing of the ratchet 23. If the pin 25 infiuences the ratchet 23 to strike only partly the shoulder 16, the blade 10 snaps back before blade 11 has completed its return movement. If the blades have returned to their original position, the operating plate 5 connectedwith the arm 6 becomes free and swings back together with the cam .18 in the position shown in Fig. 1 by the pin 25 to engage the shoulder 16 of blade 10,

if the arm 6 is completely depressed, to such a degree that the length of its engagement is eater than the downward movement of the blade 10. Thus. the blade '11 remains arrested in its position giving free the exposure opening until the arm 6 is allowed to return in its initial position. Then the curvature 27 strikes the pin`26 of the ratchet 23, erects the latter and sets free the blade 10, which now` likewise, snaps back and closes the obiective opening.

Bv the specific form and bearing of the operating lever the tension and operation of the shutter blades is effected in a simple manner and thc number of intermediate parts and levers is diminished, a part of the operating lever acting directly on the shutter blades.

Such a shutter on account of its simple construction can be manufacturedat low cost and loperates exactly.

What I claim is: i

p1. A photographic' shutter comprising in operative combination a casing Vwith a cen- Atral exposure opening, blades, and means for making instantaneous and time exposures;

lsaid means including a speed controlling elefor said blades, an operating lever rotatably mounted concentrically to the exposure opening, a spring holding the operating lever in its initial position and means mounted, onv

said operating lever for tensioning and releasing the shutterv blades automatically and' directly.

3. A photographic shutter comprising' in operative combination a casing withl a central exposure opening, blades and means for making instantaneous and time exposures; said means including a speedcontrolling element for said blades, an operating lever rotatably mounted concentrically tothe exposure opening, a spring holding the operating lever in itsinitial position, a pivoted cam mounted on said operating lever and means for causing said cam to tension and to release the shutter blades automatically and directly.

4. A photographic shutter comprising in operative combination a casing with a central exposure opening, means for making instantaneous and time exposures; said means including an` operating lever rotatably mounted concentrically to the exposure opening, a shutter bladepivoted in the shutter casing, a second shutter blade pivoted upon the first shutter blade, springs for holding` the blades in closed position, a cam mounted on the operating lever and means for causing said cam to tension and to release successively the said shutter blades directly and automatically. I

5. A photographic shutter comprising in operative combination a casing with a central exposure opening, means for making instantaneous and time exposures; said means including an operating lever rotatably mounted concentrically to the exposure opening, a shutter blade pivoted in the shutter casing, a

Vsecond shutter blade pivoted upon the rst shutter blade` springs for holding the blades in closed position, `a cam mounted on the operating lever, means for causing said cam to tension and to release successively the said shutter blades directly and automatieall and means on the operating lever for unlocging the blades pivoted in the shutter casing in time exposure during the return movement of the operating lever in its initial position.

In testimony whereof, I ax my signature.

L Eo GOLDHAMMER.