Pneumatic timer
OwnerKurt Stoll, Hans-Heinrich Glaettliinventors
Life of this patent
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Abstract
A pneumatic timer has a mark or pointer which is moved as long as the timer is in operation. The timer has a face plate supporting the adjustment knob for a choke and having a window through which the mark or pointer may be seen. The mark is on a support which is moved on the back side of the window by the free end of a bellows.
Claims18
In a pneumatic timer which includes a housing, a bellows supported in said housing so that an axis of expansion of said bellows is substantially normal to a faceplate which forms an end of said housing, said bellows having an end movable relative to said faceplate in a direction parallel to said axis of expansion, an adjustable choke joined in series pneumatically with a space in said bellows, and a choke adjusting part movably supported on said faceplate and operatively coupled to said choke, the improvement comprising a mark support supported in said housing for movement parallel to said faceplate, a connection system operatively coupling said mark support and said end of said bellows so that motion of said bellows in the direction of said axis effects movement of said mark support parallel to said faceplate, said mark support having a mark thereon and said mark being visible through said faceplate, movement of said end of said bellows causing said mark to move a distance representative of the distance moved by said end of said bellows.
A pneumatic timer, comprising:
- a faceplate;
- a control member movably supported on one side of said faceplate;
- a bellows supported on the side of said faceplate opposite said one side and having two ends, said ends of said bellows being movable toward and away from each other between first and second positions and being closer to each other in said second position than in said second position;
- resilient means for yieldably urging said ends of said bellows toward said first position;
- selectively actuable means for effecting movement of said ends of said bellows from said first position to said second position against the urging of said resilient means;
- means for facilitating a rapid escape of gas from the interior of said bellows to the exterior thereof as said ends of said bellows are moved from said first to said second position;
- means defining a passageway providing fluid communication between the interior of said bellows and the exterior thereof;
- adjustable choke means operatively coupled to said control member for selectively varying the cross-sectional area of a portion of said passageway in response to movement of said control member in order to control the rate of flow of gas through said passageway from the exterior to the interior of said bellows as said ends thereof are moved from said second position to said first position by said resilient means;
- a mark support supported in the region of said faceplate on said side thereof opposite said one side for movement relative to said faceplate in directions approximately parallel thereto between third and fourth positions, said mark support having a mark thereon on a side thereof facing said faceplate;
- and means operatively coupling said bellows and said mark support for effecting movement of said mark support between said third and fourth positions in response to movement of said ends of said bellows between said first and second positions;
- wherein said faceplate has means for facilitating observation of said mark on said mark support from said one side of said faceplate.
Dependencies are inferred from the claim text.