Pressure Responsive Device (Patent No: 667779)

Inventor: Barber Machinery Limited

Location: Edmonton

Comments: N/A

Description: The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A pressure responsive device comprising a casing, a diaphragm extending across said casing and sealed at its periphery to said casing, said diaphragm dividing said casing into first and second chambers, said casing being provided with an inlet opening communicating with said first chamber to admit a pressure applying fluid to said diaphragm to cause flexing thereof, a spindle mounted within said casing and movable longitudinally by flexing movement of said diaphragm, a first and a second spring exerting opposing forces on said spindle, means to vary the distribution of said opposing forces exerted by said springs to vary the operating range of pressures on said diaphragm causing movement of said spindle between predetermined limits of movement, an electric switch adjustably mounted on said casing and adapted to be operated by longitudinal movement of said spindle past a predetermined point, and means to vary the position of said switch to alter said predetermined point.

2. A pressure responsive device comprising a casing, a wall dividing said casing into first and second compartments, said wall being provided with a passageway and an opening connecting said first and second compartments, a valve for varying the effective size of said passageway, a diaphragm extending across said first compartment spaced from said wall and dividing said first compartment into first and second chambers, said first chamber lying between said wall and said diaphragm, said casing being provided with a first opening leading into said first chamber for filling said f:1.rst chamber with a damping liquid, a plug for closing said first opening, said casing being provided with a second opening communicating with said second chamber to admit to said second chamber a pressure applying fluid to cause flexing of said diaphragm, a spindle mounted in said casing and extending slidably through said opening in said wall, a seal to prevent substantially the passage of said damping liquid through said opening in said wall past said spindle, said spindle being adapted to be moved longitudinally by flexing of said diaphragm, a first and a second spring


























































exerting opposing forces on said spindle, means to vary the distribution of said opposing forces exerted by said springs on said spindle to vary the range of pressures on said diaphragm causing movement of said spindle between predetermined limits of movement, an electric switch adjustably mounted on said casing and adapted to be operated by longitudinal movement of said spindle past a predetermined point, and means to vary the position of said switch to alter said predetermined point.

3. A pressure sensitive device comprising a casing, a diaphragm extending across said casing and sealed at its periphery to the casing, said diaphragm dividing said casing into first and second chambers, said casing being provided with an inlet opening communicating with said first chamber to admit a pressure applying fluid to said diaphragm to cause flexing thereof, a spindle mounted within said casing and movable longitudinally by flexing movement of said diaphragm an electric switch having an operating member and a reset member, said switch being mounted on said casing by an adjusting screw, spring means urging said switch against said adjusting screw, a trip plate carried by said spindle adapted to move said operating member of said switch and cause said switch to operate to a first condition by longitudinal movement of said spindle in a first direction past a first predetermined point, movement of said adjusting screw altering said first predetermined point, a reset tripper arm adjustably mounted on said spindle and adapted to cause said switch to operate to a second condition by longitudinal movement of said spindle in a second direction past a second predetermined point, and means to vary the position of the reset tripper arm longitudinally with respect to said spindle to alter said second predetermined point.

4. A pressure responsive device for controlling an electric current comprising a casing, a horizontal wall dividing said casing into upper and lower compartments, said wall being provided with a small passageway and a centrally located opening connecting said upper and lower compartments, a valve for varying the effective size of the opening in said passageway, a diaphragm mounted horizontally within said lower compartment and dividing said lower compartment into


























































first and second chambers, said first chamber being between said wall and said diaphragm, said casing being provided with a first opening leading into said first chamber for filling said first chamber with a damping liquid, a plug for closing said first opening, said casing being provided with a second opening leading into said second chamber, said second opening being adapted to communicate with a liquid which is to apply pressure to said diaphragm to cause flexing thereof, a spindle mounted in said casing and extending slidably through said centrally located opening in said wall, a seal to prevent substantially the passage of liquids through said centrally located opening past said spindle, said spindle being adapted to be moved longitudinally by a flexing of the diaphragm, a member in said upper compartment adjustably mounted to said casing and adjacent said spindle, a first and second spring in said upper compartment exerting opposing forces on said spindle from said member, means to vary the position of said member longitudinally to alter the distribution of forces on said spindle and thereby alter the operating range of pressures on said diaphragm causing movement of said spindle between predetermined limits of movement, said casing being provided with a third opening leading into said upper compartment to maintain it substantially at atmospheric pressure and a fourth opening leading into said upper compartment to accommodate said spindle, an electric switch having an operating member and a reset member, said switch being adjustably mounted to said casing, a trip plate carried by said spindle adapted to move said operating member of said switch and cause said switch to operate to a first condition by longitudinal movement of said spindle in a first direction past a first predetermined point, means to vary the position of said switch longitudinally to alter said first predetermined point, a reset tripper arm adjustably mounted on said spindle and adapted to move said reset member of said switch to cause said switch to operate to a second condition by longitudinal movement of said spindle in a second direction past a second predetermined point, and means to vary the position of the reset tripper arm longitudinally with respect to said spindle to alter said second predetermined point.


























































5. A pressure responsive device according to claim 4, wherein said means to vary the position of said reset tripper arm longitudinally with respect to said spindle comprises an adjusting screw threadedly engaging said spindle.

Alex. E. MacRae & Co.,
56 Sparks Street,
Ottawa, Canada.
Patent Agents for Applicant.