Geometrical instruments – Miscellaneous – Light direction
Patent
1987-05-05
1989-06-06
Ward, Robert S.
Geometrical instruments
Miscellaneous
Light direction
33 1SB, 33760, G01B 310, G01C 2100
Patent
active
048358703
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a device for measuring the distance and direction of destinations on road maps according to the generic part of the main claim. In such a commercially available measuring device for the input of intermediate destinations in navigation devices of vehicles it is known to arrange a 360-degree scale with an allocation of the cardinal points on a transparent measuring plate, wherein the degree scale is plotted in the clockwise direction proceeding from the north direction. Moreover, the measuring plate, which has a practically square shape, is provided at the sides with longitudinal scales in various scales. A borehole, in which a thread is fastened, is located in the center of the degree scale. When the measuring plate is placed on a road map with the center borehole on the starting point and the measuring plate is aligned with the north direction on the north direction of the road map, the angle of an intermediate destination can be determined from the starting point with reference to the north direction, in that the thread is placed radially relative to the intermediate destination from the central borehole. The directional angle can be read directly at the point at which the thread crosses the degree scale and, for example, can be input manually in a navigation device by means of a keyboard. The direct distance between the starting point and the intermediate destination can be measured by means of the corresponding longitudinal scale at the measuring plate, while taking into account the scale of the road map, and can likewise be input in the navigation device. However, this solution has the disadvantage that the angle and the distance must be determined independently of one another by means of two different working steps for the input of each intermediate destination. In addition, the longitudinal scale must be searched again in each instance with the correct scale when measuring distances. In road maps whose scales are not available on the measuring plate the distances must be determined by corresponding conversion. Moreover, the measuring thread can easily be damaged or torn. With greater distances a bar measuring tool, or the like, is needed in addition.
SUMMARY OF THE INVENTION
With the present solution it is attempted to determine the distance and the directional angle of an intermediate destination on a road map with only one measuring step in order to input it manually into a navigation device.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the invention resides, briefly stated, in a device of this type comprising the bracket having a guide at its other end area for the measuring tape which can be drawn out of said measuring tape case, wherein the guide is arranged in such a way that the measuring tape, when pulled out, extends away radially in an outward direction with its one lateral edge over a center of the scale on the angle measuring plate.
The device according to the invention, which comprises the characteristic features of the main claim, has the advantage that the measuring tape, which is rotatable with the bracket around the center of the angle measuring plate, can be pulled out of the measuring tape case until the selected intermediate destination in one measuring step, and the distance of the intermediate destination from the starting point, which coincides with the center of the angle measuring plate, can then be read off on the scale, and its angular deviation from the north direction can be read off on the degree scale simultaneously. The input of the intermediate destinations is accordingly substantially simplified, accelerated and facilitated. Another advantage is that the measuring tape is guided back again into the measuring tape case after completing the measurements and is accordingly protected against damage.
Advantageous developments and improvements of the characteristic features indicated in the main claim are made possible by means of the steps mentioned in the subclaims. It is part
REFERENCES:
patent: 3082534 (1963-03-01), Susikari
patent: 3514863 (1970-06-01), Moll
patent: 3568319 (1971-03-01), Moll
patent: 3651574 (1972-03-01), Burkart
patent: 3813783 (1974-06-01), Price
patent: 4642898 (1987-02-01), Miller
Osterkamp Eva
Rauch Hans
Stepper Norbert
Robert & Bosch GmbH
Scanlon Patrick R.
Striker Michael J.
Ward Robert S.
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