US1919635A

US1919635A - Camera attachment

Info

Publication number: US1919635A
Application number: US611456A
Authority: US
Inventors: Keogh Robert
Original assignee: Star Co
Current assignee: Star Co
Priority date: 1932-05-16
Filing date: 1932-05-16
Publication date: 1933-07-25
Anticipated expiration: 1950-07-25

Description

July 25, 1933. R KEOGH 1,919,635

CAMERA ATTACHMENT Filed May 16, 1952 MM @L IN VENTOR.

ATTORNEYS bulb 9, by means of wires 10 and 11. The

Patented July 25, 1933 UNITED STATES ROBERT KEOGH, 0F HOLLIS, NEW YORK, ASSIGNOR T0 STAR COMPANY, OF NEW YORK,

N. Y'., A CORPORATION OF NEW YORK CAMERA ATTACHMENT Application filed May 16,

My invention relates to a new and improved camera attachment.

' One of the objects of my invention is to .provide a camera attachment for operating the shutter of a camera.

Another object of my invention is to provide a camera attachment for operating the shutter of a camera at the proper time, when a flashlight bulb is utilized.

Another object of my invention is to provide a camera attachment of: a simple and compact type, which can be readily applied to a camera, in order to provide a direct means for operating the shutter of the camera.

Other objects of my. invention will be specified the following description and drawing, which illustrates a preferred embodiment thereof, it being understood that the above statement of the objects of my invention is intended to generally explain the same without limiting it in any manner.

Heretofore the operation of the shutter of a camera when a flashlight bulb was utilized, has been very inaccurate. The operator was compelled to guess the proper. moment for operating the shutter of the camera. When a flashlight bulb has its circuit closed, a short time necessarily elapses befor the flashlight bulb is suificiently heated in order to operate. If the photographer operated the shutter of the camera at the wrong time, the flashlight bulb was of little or no use.

According to my invention, an electrical control is provided for operating the shutter of the camera at the proper-moment.

The drawing illustrates a diagrammatic view of the device herein.

Referring to the drawing, the battery 1 is connected to the terminals of the flashlight circuit is controlled by means of a handswitch 2. An electromagnet 4 is connected in shunt to the battery 1, by means of the wires 11 and 12. The shunt circuit of which the electromagnet 4.for ms a part, may include an adjustable resistance 3 and the circuit of the electromagnet is also controlled by switch 2.

The electromagnet 4 is provided with an armature 6 which pivotally mounted at 7.

. sent through the electromagnet 4. The re- 1932. Serial No. 611,456.

A spring 5 may be provided for holding the armature 6 away from the core of the electromagnet4. The armature 6 abuts the trigger 8 of the camera C so that when the armature 6 is turned in the clockwise direction, it operates the trigger 8 and thus releases the shutter of the camera 0.

The parts (including the battery) may be mounted upon a suitable base 15, which may be suitably connected to the wall of the camera.

In order to operate the device, it is merely necessary to close the switch 2. When the flashlight bulb 9 is cold, its filament has a low resistance. The major portion of the current is therefore sent through the bulb 9, while the armature 6 remains inoperative because insufiicient current is sent through the electromagnet 4, to operate the armature 6 against the force of the spring 5. The spring 7 5 may be under any desired tension, and this tension may be adjustable by means of any well known device. Likewise, astop may be utilized for preventing the armature 6 from moving out of abutting relationship with the 75 trigger 8. The flashlight bulb 9 is of the well known type, so that it requires no specific description. As the filament of the flashlight bulb 9 is heated by the passage of current through the same, the resistance of said bulb 9 increases. Since the flashlight bulb 9 is of the usual vacuum type, the heat which is produced in the filament by the passage of the current is radiated very slightly so that the temperature of said filament and the resistance thereof is rapidly and uniformly increased, until the temperature of the filament is sufliciently high to ignite the flashlight material. This causes more current'to be sistance 3 and the resistance of the electromagnet 4 (together with the inductance of the electromagnet 4) can be properly selected so that the shutter is operated to provide i111 Iexposure when the bulb 9 flashes or emits xperience has shown that it is simple to properly adjust the resistance of the various parts so that the bulb 9 is caused to emit its light at the proper moment, so as to secure a also connected to said source of current, said flashlight bulb and said electromagnet being energized in circuits, parallel to each other, by said source of current and having their circuits controlled by. a common switch, said electromagnet having an armature Whose movement is adapted to control the operation of the shutter of the camera, the circuit of said electromagnet having an impedance which causes said shutter to be operated immediately before the incandescence of the flashlight filament reaches the flashing point, the circuit of said electromagnet including a variable resistance.

ROBERT KEOGH.