Abstract A pneumatic timing device in which a timing head includes an air chamber, a diaphragm is movable relative to the timing head to effect a change in the volume of the air chamber and establish a flow of air into or out of the air chamber, a timing member is coupled for movement with the diaphragm at a rate determined by the rate of flow of air to or from the air chamber, a passage in the timing head communicates with the air chamber for conducting the flow of air, a body of porous material is in the passage for throttling the flow to a predetermined maximum rate of flow, the body of porous material having a surface of prescribed area through which the air flow passes, and a shutter is in close engagement with the surface of the body of porous material and includes a relatively non-porous member selectively movable along the surface relative to the body to close off at least portions of the area to the air flow for selectively varying the rate of the flow to regulate the rate of movement of the timing member.
A pneumatic timing device comprising: a base; a timing head including an air chamber mounted upon said base; means movable relative to said timing head to effect a change in the volume of the air chamber and movement of air into or out of the chamber; a timing member coupled for movement with said movable means along a path of travel between first and second positions at a rate determined by rate of flow of air to or frOm the chamber; a bracket for mounting said base upon an external structure; a control arm mounted upon said base for movement in response to movement of said timing member through a prescribed displacement from one of said first and second positions to actuate a control means; a stop member carried by said bracket and abutting a portion of the timing member when said timing member is at said one of said positions; and means mounting said base upon said bracket for selective adjustment of the relative position of the base and bracket to enable adjustment of the position of the stop member relative to the control arm.
Claim 2
Dependent Claim
186 words
A pneumatic timing device comprising: a base; a timing head including an air chamber mounted upon said base; means movable relative to said timing head to effect a change in the volume of the air chamber and movement of air into or out of the chamber; a timing member coupled for movement with said movable means along a path of travel between first and second positions at a rate determined by rate of flow of air to or frOm the chamber; a bracket for mounting said base upon an external structure; a control arm mounted upon said base for movement in response to movement of said timing member through a prescribed displacement from one of said first and second positions to actuate a control means; a stop member carried by said bracket and abutting a portion of the timing member when said timing member is at said one of said positions; and means mounting said base upon said bracket for selective adjustment of the relative position of the base and bracket to enable adjustment of the position of the stop member relative to the control arm.
Claim 3
Dependent Claim
58 words
The pneumatic timing device of claim 1 including: a solenoid; means coupling said solenoid with said timing member such that the timing member moves in response to operation of the solenoid; a frame upon which the solenoid is mounted, said frame being integral with said bracket; and said frame and said bracket being fabricated of a heat-conductive material.
Claim 4
Dependent Claim
48 words
The timing device of claim 1 wherein said control means includes an electrical switch capable of being actuated by the control arm as said control arm is moved in response to movement of the timing member from said one of said positions toward the other of said positions.
Claim 5
Dependent Claim
53 words
The timing device of claim 3 wherein said control means includes over-center spring means coupling said control arm with said electrical switch and arranged such that the bias of the overcenter spring means will be reversed as the timing member moves from said one of said positions to the other of said positions.