Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1981-12-17
1984-08-21
Haroian, Harry N.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 920
Patent
active
044661975
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for measuring or detecting the degree of inclination, in a vertical plane, of the axis of a tubular object, from a viewing position situated in this same plane, the said device comprising a system of communicating vessels, which is integral with the tubular object and contains a liquid.
The measuring of the degree of inclination of an object from a viewing position situated perpendicularly of the vertical plane of inclination of a reference axis of this object can easily be effected, since it is possible to materialise the angle of inclination and to observe this angle. On the contrary, the measuring of the degree of inclination of an object from an observation or viewing position situated in the actual plane of inclination cannot be achieved by direct simple observation of the angle of inclination.
Therefore, the invention has for its object to provide a device, which is simple and can easily be used, enabling this problem to be resolved.
To this end, the device according to the invention, comprises a system of communicating vessels composed of a first tubular compartment, of which at least a part of the wall is transparent or translucent, in such manner as to permit the observation of the level of the liquid in an annular chamber disposed perpendicularly of the axis of the tubular object and a second tubular compartment which is parallel and diametrically opposite to the first, the axes of the two tubular compartments being situated in the vertical plane of inclination of the axis of the object, the upper ends of these compartments opening into the annular chamber and their lower ends communicating with one another by way of a connecting conduit, the quantity of liquid in the system of communicating vessels being such that its level is in the vicinity of the upper end of the first compartment for the minimal inclination of the object axis relatively to the vertical and the ratio of the section of the annular chamber to that of the first compartment being sufficiently large for the variation of the level in this chamber, when the axis of the object is subject to an inclination, to be practically negligible in relation to the variation in level in the first compartment.
The invention will be better understood from the description of one embodiment of the device, as given below in respect of a non-limiting example, and with reference to the accompanying drawings, in which:
FIG. 1 is a diagrammatic front view, in perspective, of the device;
FIG. 2 is a diagrammatic section of the device as shown in FIG. 1, along a vertical sectional plane perpendicular to the plane of FIG. 1; and
FIG. 3 is a diagrammatic section of the device along the plane III--III indicated in FIG. 2.
The constructional form of the device as shown in the drawings is intended for permitting the measurement of the inclination of a mortar barrel, with a view to adjusting the firing range.
As will be seen from FIG. 1, the device comprises a tubular sleeve 1 surrounding a part of the length of the mortar barrel 2, this sleeve being opaque and formed with a viewing window 3, through which can be seen the level 4 of the liquid contained in a tubular compartment 5 forming part of a system of communicating vessels. The sleeve 1 is held in a fixed position against a shoulder 6 of the tube 2 by means of a locking nut 7 which engages a screw-thread 8 formed on the barrel 2 (FIG. 2). The shoulder 6 cooperates with another shoulder 9 with a view to the fastening of fixing means (not shown) of carrying strap or sling (also not shown) of the barrel 2. The observation window 3 carries a graduated scale, which makes possible the reading of the position of the level 4 of the liquid. This scale may advantageously be provided with indications which correspond to the firing range and expressed, for example, in meters and, as in well known, is in direct relation with the inclination of the barrel for an ammunition having given characteristics.
An annular chamber 10 is defined by the sleeve 1 and by an annular groove 10' formed
REFERENCES:
patent: 1274333 (1918-07-01), Roland
patent: 1531191 (1925-03-01), Karnes
patent: 1958314 (1934-05-01), Reid
patent: 2019178 (1935-10-01), Elsom
Haroian Harry N.
Valinor, S.A
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