| 摘要 |
<p>A pneumatic pressure transmitting device for transmitting a pneumatic pressure which is in linear relation to a variable applied force, of the kind comprising a pneumatic pressure chamber having an inlet duct with throttling means for admitting air under a pressure greater than that to be transmitted, and an outlet duct in communication with the inlet duct downstream of the throttling means, and a pneumatic pressure relief opening which is closed by a loose cover which engages a seating surrounding the opening, the cover being acted upon by a damper which damps its movement off and on to the seating to prevent it from vibrating and also acted upon by a member by which the variable force is applied to it as a thrust along a line of action in alignment with the resultant of the pneumatic pressure in the chamber acting on the cover, so that when a force is applied to the member and air is supplied under pressure through the inlet duct, the pressure in the chamber increases until the cover is moved off its seating against the applied force to allow air to escape from the opening to such an extent that equilibrium is established between the oppositely acting pressure and force on the cover, the equilibrium pressure which is in linear relation to the force being transmitted through the outlet duct, the device being provided outside of the pneumatic pressure chamber with a receptacle for receiving oil or other damping liquid, and the damper including a plate which is supported near the bottom of the receptacle where, in use, it is submerged in the damping liquid, one part, that is either the receptacle or the plate being rigid with the cover and the other part, that is the plate or the receptacle respectively, being rigid with the body containing the pneumatic pressure chamber.</p> |
