US 4,072,171 AGranted

Pressure control valve for a sphygmomanometer

OwnerShizumasa Nakazawainventor

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Abstract

A control valve for a sphygmomanometer comprising a valve housing having at one end a communication opening adapted for communication with an arm cuff and at its other end an air supply opening adapted for communication with an elastic bulb for supplying air to the arm cuff. The housing has an air passage connecting the two openings. A tubular body is mounted on the casing to project radially therefrom and the body is connected at its bottom portion through a communication opening to the air passage intermediate the ends thereof. The outer end of the body is open to the atmosphere. A first valve of tubular shape is arranged to open and close an open end of the tubular body and a second valve of rod shape is loosely mounted in an air passage in the first valve and has an outer end projecting externally from the tubular body. The inner end portion of the second valve serves to open and close an open end of the air passage in the first valve. The first valve is restrained in a valve-closing position by a threaded tube screwed on the tubular body and a spring is provided which acts on the first valve in a valve-opening direction and on the second valve in a valve-closing direction. A check valve is mounted on the side of the air supply opening of the valve housing.

Claims7

Dependent claims

A pressure control valve for a sphygmomanometer comprising a housing provided with an air passage having one end adapted for connection to an arm cuff and another end for connection with an air supply, a tubular body secured to said housing and having a hollow interior with a first end communicating with said air passage intermediate the ends thereof and a second open end, first valve means for closing said open end of the tubular body, said first valve means having a bore therein constituting an air passage having a first end in communication with ambient atmosphere and a second end in communication with the hollow interior of the tubular body, a second valve means loosely and slidably mounted in said bore in said first valve means for selectively opening and closing said second end of the air passage in said first valve means, external actuator means coupled to said second valve means and slidably actuated to displace the second valve means in said first valve means, spring means acting on said second valve means for closing said second end of the air passage in said first valve means, and a threaded member screwed on said tubular body for engaging said first valve means to hold the same in closed position against the open end of the tubular body, said second valve means including a portion bearing against said first valve means in the closed position of said second end of the air passage in said first valve means, said spring means acting on said first valve means through said portion on said second valve means to urge the first valve means in a direction tending to open said second end of the tubular body.

Dependencies are inferred from the claim text.