Pressure gauge for sphygmomanometers
OwnerBlasius Speidelinventor
Life of this patent
Estimating the term…
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.
Claims12
A pressure gauge of the type which gives a pressure indication by means of a rotating indicator comprising in combination:
- a pressure gauge frame;
- a sensing shaft journalled in the pressure gauge frame for rotation about a sensing shaft axis;
- pressure sensing means associated with the sensing shaft and operable to transduce and convert pressure values into corresponding angular displacements of the sensing shaft;
- a pointer shaft journalled in the pressure gauge frame for rotation about a pointer shaft axis which is oriented substantially perpendicularly to the sensing shaft axis, the pointer shaft carrying said rotating indicator;
- and
- a magnifying angle gear drive connecting the sensing shaft to the pointer shaft in such a way that small angular displacements of the sensing shaft create much larger angular displacements of the pointer shaft, the angle gear drive including a gear segment on the sensing shaft and a cooperating pinion on the pointer shaft;
- and wherein
- the pinion on the pointer shaft is a spur gear whose teeth are parallel to the pointer shaft axis;
- the gear segment is in the form of a drive arm, which has one extremity fixedly attached to the sensing shaft and includes on its other extremity a tooth-carrying yoke in the shape of a sector of a thin-walled tubular body, the teeth of the gear segment extending axially and in a radial plane with respect to the sensing shaft;
- and
- the gear segment defines a means for changing the mangification ratio of the angle gear drive to a higher or lower ratio by providing adjustability of the radial distance of the teeth-carrying yoke from the sensing shaft axis.
A pressure gauge of the type which gives a pressure indication by means of a rotating indicator comprising in combination:
- a pressure gauge frame;
- a sensing shaft journalled in the pressure gauge frame for rotation about a sensing shaft axis;
- pressure sensing means associated with the sensing shaft and operable to transduce and convert pressure values into corresponding angular displacements of the sensing shaft;
- a pointer shaft journalled in the pressure gauge frame for rotation about a pointer shaft axis which is oriented substantially perpendicularly to the sensing shaft axis, the pointer shaft carrying said rotating indicator;
- and
- a magnifying angle gear drive connecting the sensing shaft to the pointer shaft in such a way that small angular displacements of the sensing shaft create much larger angular displacements of the pointer shaft, the angle gear drive including a gear segment on the sensing shaft and a cooperating pinion on the pointer shaft;
- and wherein
- the pinion on the pointer shaft is a spur gear whose teeth are parallel to the pointer shaft axis;
- the gear segment is in the form of a drive arm, which has one extremity fixedly attached to the sensing shaft and includes on its other extremity a tooth-carrying yoke in the shape of a sector of a thin-walled tubular body, the teeth of the gear segment extending axially and in a radial plane with respect to the sensing shaft;
- and
- the gear segment defines a means for skewing the magnification ratio of the angle gear drive into a non-uniform ratio by providing adjustability of the teeth-carrying yoke in such a way that at least a portion of its teeth is shifted out of concentricity with the sensing shaft axis, thereby making it possible to produce linear pointer shaft displacements from nonlinear sensing shaft displacements.
Dependencies are inferred from the claim text.