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Pneumatic indicator device and method of making the same
| Details |
Inventors: Moon, Jr., William T.; Rogers, Arden D.; Goff, Clifford E.; Bannon, Harry B.;
Assignee: Robertshaw Controls Company (Richmond, VA)
Primary Examiner: Husar; Francis S.
Assistant Examiner: Crosby; Gene P.
Attorney, Agent or Firm: Candor, Candor & Tassone
A pneumatic indicator device having a housing carrying a movable flag that in one position thereof visually indicates one pneumatic condition of the device and in another position thereof visually indicates another pneumatic condition of the device, the housing also carrying an electrical switch which is operatively associated with the movable flag so that the switch electrically indicates the positions of the flag for remote indication purposes. |
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DETAILED DESCRIPTION We claim: 1.
In a method of making a pneumatic indicator device having a housing means carrying in a chamber thereof a movable flag that in one position visually indicates through a window means of said housing means one pneumatic condition of said device and in another position visually indicates through said window means another pneumatic condition of said device, said housing means carrying therein a pneumatically operated plunger that engages and moves said flag between said positions thereof in relation to said pneumatic conditions of said device, the improvement comprising the steps of disposing an electrical switch means in said housing means, forming said movable flag with means thereon that operates said switch means so that said switch means electrically indicates said positions of said flag, forming said housing means with a bore means passing completely therethrough in a manner to partially intersect with said chamber and receive said electrical switch means therein so that part of said switch means is exposed to said chamber, and disposing sealing means in said bore means to seal said bore means from the exterior of said housing means and secure said electrical switch means in said bore means of said housing means so that said part of said switch means is directly exposed to said chamber.
2.
In a method as set forth in claim 1, the additional steps of forming said electrical switch means to be magnetically operated, and forming means on said flag for magnetically operating said switch means when said flag is in one of said positions thereof.
3.
In a method as set forth in claim 2, the additional step of forming said means on said flag from a magnet to be carried by said flag.
4.
In a method as set forth in claim 3, the additional steps of riveting said magnet to said flag by a single rivet, and forming said flag with two other rivets adjacent said magnet to prevent rotation of said magnet about said single rivet thereof.
5.
In a method as set forth in claim 2, the additional steps of forming said means on said flag from magnetic material to be carried by said flag, disposing a fixed magnet in said housing means for operating said switch, and causing said magnet material of said flag to be disposed between said magnet and said switch to divert the magnet flux of said magnet away from said switch when said flag is in one of said positions thereof
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