Geometrical instruments – Straight-line light ray type – Combined
Patent
1980-08-01
1982-08-10
Martin, Jr., William D.
Geometrical instruments
Straight-line light ray type
Combined
33283, 33295, 33395, G01C 100
Patent
active
043430902
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a suspension device for an angle indicator, more precisely for an angle indicator for two directions perpendicular to each other.
The device is intended to be used primarily for indicating and directioning an object in two mutually perpendicular directions to the vertical line.
In Swedish Pat. No. 7806036-5, (corresponding U.S. application Ser. No. 40,393, filed May 18, 1979, replaced by U.S. Ser. No. 221,374, filed Dec. 30, 1980), an angle indicator for two mutually perpendicular directions is described, which comprises two angle-indicating devices, for example according to Swedish Pat. No. 7611511-2, each of which includes a pair of screens, of which each screen consists of opaque lines separated by transparent interstices, in such a manner, that an interference pattern, a so-called moire pattern, is formed when light is transmitted through each screen unit. The first screen is stationary, and the second step is freely rotatable to assume a predetermined position relative to the vertical line. The two angle-indicating devices are located in planes perpendicular to each other. A mirror is provided to project a reflected image of one of the angle-indicating devices in a plane, in which the other angle-indicating device is located. When observing the angle indicator, the two moire patterns created through the angle-indicating devices seem to be located to the side of each other. The position of the object, thus, in the two directions perpendicular to each other can be read from one viewing direction.
At this device the setting of desired angles of the object is effected, in that on each of the angle-indicating devices the stationary screen is turned in relation to the housing associated with the angle indicators, whereafter the object is turned until a characteristic interference pattern is formed. This pattern arises when the screen lines of the two screens in the angle indicator device are in parallel.
This implies, thus, that the angle indicator device will incline relative to the horizontal plane, presupposed that some other directioning of the object than just a vertical one is made.
According to this embodiment, furthermore, the housings of the angle-indicating devices must be attached non-rotatably to the object, which implies that the instrument cannot be directioned to a fixed point in a desired manner.
When, for example, a series of holes are to be drilled for blasting a road, it is desired to align a series of drilling places along a line. This line generally is chosen as a direction to a fixed point, such as an object in the landscape, for example a church tower or a high tree.
In connection therewith, thus, it is desired so to direction the drill rod that subsequent drill holes are in parallel with each other, and so that they form a certain angle both to a vertical plane through, for example, said church tower and a certain angle of 90.degree. to said vertical plane. As the aforesaid angle indicator is not rotatably connected to the drill rod, such a directioning cannot be carried out.
The present invention solves the aforesaid problem and it provides at the same time an efficient protection for the angle-indicating devices.
The invention, thus, relates to a suspension device a suspension device for an angle indicator intended to indicate the angle of an object relative to the vertical line and comprising two angle-indicating devices, each designed to indicate a predetermined angle to the vertical line, and located in two planes perpendicular to each other, the suspension device having an outer ring rotatable about one of its diameters.
At its periphery the ring is connected by one or several axles or trunnions to the object. An inner ring is located perpendicularly to and inside of the outer ring and movable around the inner periphery of the outer ring. Attachment components attach the angle indicator inside of the inner ring, such attachment components being movable around the inner periphery of the inner ring, and the outer ring being rotatable about the axis of th
REFERENCES:
patent: 1346547 (1920-07-01), Lackland
patent: 2544438 (1951-03-01), Allgeo
patent: 2834118 (1958-05-01), Jackson
patent: 3707772 (1973-01-01), Cotter
patent: 3945129 (1976-03-01), Bergkvist
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