초록

A switching device with a normally open electrical condition which engages contacts in response to a rise in fluid pressure for the purpose of activating an associated electric powered device such as a fuel pump in an automobile when pressures are much greater than zero.

대표청구항 ▼

An improved switching device responsive to pressure changes of a fluid such as oil in an internal combustion engine, comprising: generally hollow enclosure means defining an interior, one end of which is adapted to receive pressurized fluid, a second opposite end of which is configured for transmitt

An improved switching device responsive to pressure changes of a fluid such as oil in an internal combustion engine, comprising: generally hollow enclosure means defining an interior, one end of which is adapted to receive pressurized fluid, a second opposite end of which is configured for transmitting pressure related output; diaphragm means having a peripheral edge and a flexible mid portion, the peripheral edge being attached to the enclosure means and the mid portion separating the interior of the enclosure into first and second spaces, the first space which is closest to the enclosure\s first end receiving pressurized fluid therein and the second space being exposed to atmospheric pressure, whereby a fluid pressure force balance is generated on the diaphragm tending to move the mid portion in a direction normal to the plane of the diaphragm and axially within the enclosure which axial direction extends between the first and second ends thereof; a piston member operably attached to the mid portion of the diaphragm for movements therewith in the axial direction; the enclosure defining a first channel extending axially therein and positioned radially outwardly from the piston and open to the enclosure\s interior; a radially outwardly projecting actuator arm of the piston extending into the first channel and movable therein as fluid pressure changes cause movements of the diaphragm and piston; the enclosure further defining a second channel extending circumferentially therein and positioned to intersect the first extending channel, the channels being substantially normal to one another; an electrically conductive contact bar within the second channel, the second channel and the contact bar being dimensioned relative to one another for permitting movements in the axial direction; a pair of switch conductors supported by the enclosure and having end portions at one end of the second channel so that the contact bar engages the end portions when in a first operative position, whereby the arm of the piston engages the contact bar and moves it to a second operative position disconnected from the conductors as the piston is moved in response to pressure changes.