Abstract: The blood pressure measuring device (10) has a bowl-shaped casing (11) in which is arranged a pressure measuring system with a measuring scale (13) and indicator. The casing (11) is closed at its upper edge by a transparent cover plate (25). This primary casing (11) is surrounded at a given distance on the outside by a protective housing (15), whereby the base (18) of the protective housing (15) is combined in one piece with the base (16) of the primary casing (11). The compressed air line is connected either through a hole (22) in the base (16) of the casing (11) or through the casing walls. In the latter case, there is a material bridge in the space between the wall of the primary casing (11) and of the protective housing (15).

Abstract: An exhaust valve (10), particularly for a blood pressure measuring apparatus, comprising a valve seat (31) disposed along the course of an outlet channel in a valve housing (11) and oriented toward the pressure side of the valve. A valve body (25) having the form of a slender conical frustum arranged on the pressure side of the valve seat (31) cooperates with the valve seat. Valve body (25) is urged against the valve seat (31) by a closing spring (27). To facilitate controlled release of an elevated pressure contained by the valve, a screw cap (37) is arranged on the valve housing (11) along the axial projection line of the valve body (25), and the valve body (25) is connected to the screw cap (37) through a support bearing (43). A two-stage steep thread (44,45) is provided between the screw cap (37) and the valve housing (11).

Abstract: An air release valve for sphygmomanometers in the form of a flow metering device in an air outlet duct comprising a length of a flexible tube as part of said duct and a pressure member which is displaceable against the valve tube by means of a pivot lever, so as to collapse one tube wall against the other to close the cavity of the valve tube and to produce an initially very gradual and later progressively greater opening response, when the pressure member is retracted and the valve tube is allowed to return to its open state. The valve tube may be an arcuate tube portion extending freely between two parallel spouts of the air outlet duct, or it may be a straight tube portion confined in a longitudinal groove of the valve housing. A U-shaped leaf spring between the valve housing and the pivot lever provides a valve closing force, finger pressure against the pivot lever produces a controlled valve opening action.

Abstract: A dual-function deflation valve for hand-held blood pressure measuring devices with a finger-depressible valve actuating lever which has a detent mechanism capable of retaining the lever in the fully open valve position, for a quick release of residual air pressure from the measuring cuff. The detent mechanism has two detent members with cooperating cam formations defined by the valve housing and valve actuating lever, respectively, either on coextending wall portions of both, or on a wall portion of the actuating lever and on a spring member which is mounted in a recess of the housing.

Abstract: A pressure gauge for sphygmomanometers, having a pressure capsule with a diaphragm wall, a pointer on a rotatable spring-biased pointer shaft, and a drive mechanism connecting the diaphragm wall to the pointer shaft by picking up and magnifying the displacements of the diaphragm wall, the drive mechanism including a sensing member on a rotatable sensing shaft, in contact with the diaphragm wall, and a magnifying gear drive consisting of a drive arm on the sensing shaft with gear teeth forming a gear segment of large radius, in driving engagement with a pinion on the pointer shaft. The drive arm may be bendable to adjust the gear drive ratio.

Abstract: A deflation valve for blood pressure measuring devices having a valve body with a threaded extension surrounded by concentric outlet grooves for slow-deflation and dumping purposes, respectively, in an outwardly facing flat valve seat covered by a flexible valve disc. The valve disc, clamped fast on its inner periphery and held against the valve seat by a spring, has attached to it a sleeve-like control member which can be operated at any point on its periphery by a hand holding the inflation bulb to which the valve is attached.

Abstract: A sphygmomanometer, measuring capillary joined to a mercury storage tank by means of an internal passageway, is provided with a shut-off device for selectively blocking and opening the passageway. The shut-off device has a valve housing including a valve chamber which intersects the passageway and which terminates internally in a valve seat. A locking piece is mounted inside the valve chamber for rectilinear movement, with respect to the valve seat, from a closed position in engagement with the valve seat wherein the passageway is blocked, to an open position removed from the valve seat wherein the passage is open. The locking piece is biased in its open position by means of a spring arrangement, and a lever arrangement including a detenting mechanism is provided to move the locking piece to its closed position and to releasably lock it there.

Abstract: A two-pointer blood pressure indicator gauge with pointer blocking solenoids for the indication of the systolic and diastolic pressures, the gauge having a blocking member or a brake disc directly attached to each of the two pointer shafts, and in which the armature of each solenoid, or a solenoid-actuated brake lever, cooperates with the associated brake member or brake disc, respectively, thereby blocking the spring-driven return motion of the pointers. The pointer for the higher pressure, being dragged by the other pointer during pressure buildup, against a separate spring, is blocked first, allowing the pointer for the lower pressure to continue its return movement until it, too, is blocked.

Abstract: A blood pressure measuring device with a quick-evacuation air valve, where the cone-shaped valve plunger has a bypass channel reaching from the pressureless side to a point on the sealing surface of the plunger which, at the maximum normal opening stroke of the latter remains within the throttling range of the valve, but which after an additional opening motion against an abruptly higher spring bias, is opened to the pressure side, thereby rapidly evacuating the device. A detent serves to hold the actuating lever of the valve in its quick-evacuation position.

Abstract: A microphone for the transmission and conversion of low frequency body sound signals, characteristic of blood pressure conditions, the microphone featuring a Seignette salt crystal wafer as a transducing element, a foamed body as a transmitting element, a vibrating mass on the microphone membrane, and a deflection-limiting safety plate. The membrane carries a contact-focusing touch plate, and the entire housing is enveloped in a sound insulating rubber jacket.