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Publication numberUS2497867 A
Publication typeGrant
Publication dateFeb 21, 1950
Filing dateJul 9, 1945
Priority dateJul 9, 1945
Publication numberUS 2497867 A, US 2497867A, US-A-2497867, US2497867 A, US2497867A
InventorsThomas Cymmer
Original AssigneeThomas Cymmer
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Moistureproof construction for shafts
US 2497867 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)



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

1 Claim.

(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

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1436444 *Feb 26, 1920Nov 21, 1922Bradford B HolmesRefrigerating apparatus
US1736974 *Aug 3, 1920Nov 26, 1929Gen Motors Res CorpPump for refrigeration systems
US2119955 *Jun 4, 1936Jun 7, 1938Litton Charles VVacuum-tight power transmission device
CH98132A * Title not available
SE92097A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2617306 *Sep 15, 1949Nov 11, 1952Lewis Eng CoRotation-transmitting device
US2742790 *Oct 31, 1952Apr 24, 1956Nelson Anton RSealed gear casing and driving means
US2844237 *Jul 7, 1955Jul 22, 1958Morse William LTorque control
US2863336 *Sep 7, 1956Dec 9, 1958Burroughs CorpApparatus for actuating sealed instruments
US2943495 *Mar 31, 1958Jul 5, 1960United Shoe Machinery CorpMeans for producing motion through sealed wall
US3248678 *May 1, 1963Apr 26, 1966Bendix CorpRotary variable resistor
US3293926 *Dec 23, 1964Dec 27, 1966Rca CorpSealed rotary drive apparatus
US3457795 *Dec 8, 1967Jul 29, 1969Mechanized Science Seals IncRotary seal assembly
US4216677 *Jul 17, 1978Aug 12, 1980Borg-Warner CorporationHermetically sealed rotary drive apparatus
US4569669 *Jan 20, 1983Feb 11, 1986Starling John MDrive units for effecting torque-transmission via a non-rotating sealing tube
US4767396 *Mar 3, 1987Aug 30, 1988Haemonetics CorporationMethod and apparatus for processing biological fluids
US5193977 *Nov 22, 1991Mar 16, 1993Don DameFlexible membrane sealless centrifugal pump
US5243867 *Sep 26, 1991Sep 14, 1993Huntington Mechanical Laboratories, Inc.Mechanism for feedthrough of rotary motion to a sealed chamber
EP0180903A2 *Oct 29, 1985May 14, 1986Klein, Schanzlin & Becker AktiengesellschaftHermetically sealed shaft passage for oscillating and rotational motion
WO1983002654A1 *Jan 20, 1983Aug 4, 1983John Michael StarlingDrive units for effecting torque-transmission via a non-rotating sealing tube
U.S. Classification74/17.8, 74/18
International ClassificationF16H21/00, G05G25/04, F16J15/52, G05G25/00, F16H21/14, F16J15/50
Cooperative ClassificationF16J15/525, G05G25/04, F16H21/14
European ClassificationF16J15/52B, F16H21/14, G05G25/04