Apertured diaphragm end valve

Claim 2

An apertured diaphragm end valve capable of providing controlled pressure leakage in a pneumatic system comprising: A. an end plate containing a central aperture for connection to a pneumatic hose; B. a diaphragm element for engagement with said end plate comprising; i. a rigid support ring; and ii. a resilient blatter defined by said support ring and having a centrally located aperture therein; C. a backing second end plate containing: i. an aperture bleed port; ii. metal contacts for closing an electric circuit upon deflection of said diaphragm; iii. a metallic leaf spring which touches said metal contacts upon the closing of said electric circuit and contained thereon, a projection aligned with said aperture of said blatter.

Claim 3

The apertured diaphragm end valve of claim 1 wherein said diaphragm and second backing end plate are so spaced as to allow for controlled air leakage through said apertures contained in said blatter and second backing end plate when said electric circuit is not closed.

Claim 4

The apertured diaphragm end valve of claim 1 wherein said central aperture is in threaded engagement with said pneumatic system.

Claim 5

The apertured diaphragm end valve of claim 1 wherein said end plate is metal.

Claim 6

In a vehicle parking instruction device comprising: A. a base including means extending laterally thereof as a support for a simulated curb; B. a simulated curb resiliently suspended apart from said base and above a parking surface; C. at least one pressure sensitive element supported upon said parking surface adjacent said curb; and D. signal means connected to said pressure sensitive element as an indicator of the student vehicle tire position with respect to said curb; the improvement comprising: said pressure sensitive element being an apertured diaphragm end valve capable of providing controlled pressure leakage in the vehicle instruction device, said apertured diaphragm end valve comprising: A. an end plate containing a central aperture for connection to a pneumatic hose; B. a diaphragm element for engagement with said end plate comprising: i. a rigid support ring; and ii. a resilient blatter defined by said support ring and having a centrally located aperture therein; C. a backing second end plate containing i. an aperture bleed port; ii. metal contacts for activating said signal means upon deflection of said diaphragm; iii. a metallic leaf spring which touches said metal contacts upon activation of said signal means and contained thereon a projection aligned with said aperture of said blatter.

Claim 7

In a vehicle parking instruction device comprising: A. a base including means extending laterally thereof as a support for a simulated curb; B. a simulated curb resiliently suspended apart from said base and above a parking surface; C. at least one pressure sensitive element supported upon said parking surface adjacent said curb; and D. signal means connected to said pressure sensitive element as an indicator of the student vehicle tire position with respect to said curb; the improvement comprising: said pressure sensitive element being an apertured diaphragm end valve capable of providing controlled pressure leakage in the vehicle instruction device, said apertured diaphragm end valve comprising: A. an end plate containing a central aperture for connection to a pneumatic hose; B. a diaphragm element for engagement with said end plate comprising: i. a rigid support ring; and ii. a resilient blatter defined by said support ring and having a centrally located aperture therein; C. a backing second end plate containing i. an aperture bleed port; ii. metal contacts for activating said signal means upon deflection of said diaphragm; iii. a metallic leaf spring which touches said metal contacts upon activation of said signal means and contained thereon a projection aligned with said aperture of said blatter.

Claim 8

The vehicle parking instruction device of claim 5 wherein said diaphragm and second backing end plate are so spaced as to allow for controlled air leakage through said apertures contained in said blatter and second backing end plate when said signal means is not activated.

Claim 9

An apertured diaphragm end valve capable of providing controlled pressure leakage in a pneumatic system comprising; A. an end plate containing an aperture for connection to a pneumatic hose; B. a diaphragm engaging said end plate and having an aperture therein and C. a backing plate having an aperture bleed port and including a contact for closing an electric circuit upon deflection of said diaphragm said contacts including a projection aligned with said diaphragm aperture.

Claim 10

An apertured diaphragm end valve capable of providing controlled pressure leakage in a pneumatic system comprising; A. an end plate containing an aperture for connection to a pneumatic hose; B. a diaphragm engaging said end plate and having an aperture therein and C. a backing plate having an aperture bleed port and including a contact for closing an electric circuit upon deflection of said diaphragm said contacts including a projection aligned with said diaphragm aperture.