US 2497867 A
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Description (OCR text may contain errors)
Feb. 21, 1950 T. CYMMER MOISTUREPROOF CONSTRUCTION FOR SHAFTS Filed July 9, 1945 1N VEN TOR. THOMAS CYMMEIZ.
A TTO/ZNE X Patented F eb. 21, 195
UNITED STATES PATENT MOISTUREPROOF CO SHAF NSTRUCTION FOR TS Thomas Cymmer, Jersey City, N. J. Application July 9, 1945, Serial No. 603,995
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 370
This invention relates to a moistureproof device for transmitting rotary motion through a barrier or partition.
It is essential that many devices such as some radio and navigational equipment, be completely moistureproof. As these devices are externally controlled or adjusted by means of knobs and dials, considerable difficulty has been encountered in making them moistureproof. Packing glands around the shafts have previously been employed but they have not excluded all moisture.
The present invention provides a gas and moistureproof seal by transmitting rotary motion through an imperforate member.
An object of this invention is to provide a device for transmitting rotary motion while excluding all moisture.
Another object is to provide a device for transmitting rotary motion through an imperforate member.
Further objects and advantages of this invention, as well as its construction, arrangement and operation, will be apparent from the following description and claim in connection with the accompanying drawing, in which Fig. 1 is a central, vertical, cross-sectional view of a device embodying the present invention,
Fig. 2 is a cross-sectional view taken on the line 2--2 of Fig. 1.
The front panel of the instrument is provided with an inwardly projecting portion 2 having an aperture 3 therethrough. Mounted in the aperture 3 is a shaft 5 having an enlarged portion 5 forming a shoulder at which abuts the projecting portion 2 of the instrument panel I. A knob or dial l is fixedly secured to the end of the shaft 4 projecting outwardly of the panel I. A pin 8 prevents rotation of the dial 7 with respect to the shaft i. The end of the shaft extending inside the panel l is provided with a preferably circular member 9 eccentrically mounted on shaft 4. The circular member 9 may be made integral with the shaft 4 or may be produced separately and then secured thereon.
A metal bellows It is positioned over the circular member 9 with the skirt portion thereof soldered or otherwise sealed to the panel I about the inwardly projecting portion '2 and shaft 4 so as to provide an air tight connection therewith. The bellows is preferably made of light metal so that the pleated portion thereof may be distorted or bent as the member 9 rotates about the shaft 4. secured within the end of the metal bellows l0, preferably by soldering, is a wearing socket ll shaped to fit over the circular member 9. A wearing cap I2 is positioned over the outer end of the bellows l0 and is also secured to the bellows preferably by soldering.
Mounted on the inner face of panel I is a casing I3 having a bearing portion M in which shaft I5 rotates. Shaft I5 is so mount-ed that it is in alignment with the shaft 4. There is eccentrically mounted on the shaft I5 within the casing 13 a circular cup-shaped member IE which fits over the wearing cap !2 mounted on the end of the bellows.
With this construction no moisture can pass through the rotary transmission device to the inside of the equipment with which it is used.
In operation, rotation of the dial or knob I rotates the shaft 4 and the circular member 9 eccentrically mounted on the inner end thereof. As the member 9 rotates, it slides around the inner end of the bellows and displaces the same about the shaft 4. This in turn causes the eccentrically mounted cupped-shaped member Hi to be rotated with the eccentrically mounted member 9.
Modifications and changes can be made in the embodiment of this invention without departing from the spirit and scope of the invention.
The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.
What is claimed is:
A moistureproof device for transmitting rotary motion through a barrier comprising a rotatable shaft projecting through said barrier, a circular member eccentrically mounted on said shaft, a metal bellows positioned over said member for being secured to said barrier, a wearing socket secured to the inside of said bellows and fitting over said member, a wearing cap positioned over said wearing socket and said bellows and secured to said bellows, a second shaft outside said bellows aligned with said first shaft, a circular cup-shaped member eccentrically mounted on said second shaft and fitting over said wearing cap, whereby rotation of one shaft causes rotation of the other.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,436,444 Holmes Nov. 21, 1922 1,736,974 King Nov. 26, 1929 2,119,955 Litton June '7, 1938 FOREIGN PATENTS Number Country Date 92,097 Sweden of 1938 98,132 Switzerland of 1923