Boots – shoes – and leggings
Patent
1994-08-22
1996-08-27
Ramirez, Ellis B.
Boots, shoes, and leggings
G01C 900
Patent
active
055507573
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method according to the preamble of claim 1 for determination of the position of an elongated piece. This application is a 371 Application of PCT/F193/00056, filed on Feb. 18, 1993.
BACKGROUND OF THE INVENTION
The method according to the preamble is substantially known from U.S. Pat. No. 3,974,699, disclosing a method for measuring, for example, the position of the blade of a road grader in relation to the horizontal level.
In particular, but not solely, the method of the present invention can be used for measuring the height position or the horizontal extension of a bucket or work platform in connection with the beam structure, or a part thereof, of a working machine, such as an excavator, access platform (lifting apparatus) or the like. At present, the height position or the horizontal extension is measured by using angle detecting sensors mounted at points of articulation of the beam structure, and the position of the beam structure is calculated on basis of the information given thereby. A method of this kind has the disadvantage of a particularly difficult mounting of the angle detecting sensors afterwards on working machines with no equipment ready for measuring the height position and/or the horizontal extension. Another disadvantage is the relative complexity of measurement by angle detecting sensors, because the calculation operations required by the same require microprocessor techniques and calculation algorithms due to the fact that the method is based on trigonometric functions.
SUMMARY OF THE INVENTION
It is an aim of the present invention to provide an improved method for determining the position of an elongated piece, wherein the elongated piece is a beam structure or a part thereof. The method is used for measuring the height position and/or horizontal extension of beam structures or parts thereof. Thus the main object of the invention is to improve the state of art in the field. For achieving this object, the method of the invention is primarily characterized by the following:
--the elongated piece used is the beam structure, or a part thereof, of a working machine, such as an excavator, access platform or the like, which is arranged to be pivotable substantially in the vertical plane around a point of articulation,
--in the beam structure or part thereof, two points are determined, whose distance is known, preferably constant, wherein at least one of the points is a point of articulation,
--a calculation formula with the following general pattern is input in the computing unit:
P.sub.i =the desired projection of the distance between the points in the measuring level,
K=L/g, wherein
m.sub.s =the measuring signal of the acceleration sensor, possibly modified by an analog operator, if required, into a quantity suitable for the computing unit, and
--the measuring direction of the acceleration sensor is selected either substantially perpendicular to the direct line between the two points, wherein by using the measuring signal of the measuring sensor, the horizontal extension of the beam structure or a part thereof is provided by the calculation formula (P.sub.i =K * m.sub.s), and/or the measuring direction of the acceleration sensor is selected substantially to merge with the longitudinal direction of the direct line between the two points, wherein by using the measuring signal of the measuring sensor, the height position of the beam structure is provided by the calculation formula (P.sub.i =K * m.sub.s).
The main advantages of the method presented above include the fact that the components required for application of the method can be easily mounted afterwards to a beam structure which is not provided with equipment for measuring the height position and/or horizontal extension or in which the measuring equipment must be replaced. Covered acceleration sensors can be mounted, for example, in excavators onto the part of the beam structure to be measured. The mounting can be performed even by the contractor himself without special tools. S
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Novatron Oy
Ramirez Ellis B.
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