Weighing scales – Computer – Electrical
Patent
1989-02-14
1991-01-01
Miller, Jr., George H.
Weighing scales
Computer
Electrical
364567, 33833, G01G 1940, G01B 500
Patent
active
049811851
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method according to the preamble of claim 1 and to a device according to the preamble of claim 5 for the determination of the longitudinal dimensions of elongated and/or planar objects, such as boards and planks.
When handling various kinds of long objects, it is often also necessary to measure the length of the objects. With the exception of handling associated with automated production lines and certain machines, the measuring must usually be carried out manually with a traditional measure.
Boards and planks are typical examples of bulk goods the handling of which requires a great number of longitudinal measurings to be carried out. In timber yards, for instance, a great number of individual boards and planks have to be measured daily, which occupies labour and takes plenty of time. The need to speed up and/or automate measuring is thus obvious. In addition, the board goods to be measured are usually positioned at several places within a large area, so that it would be preferable to measure the board goods where they are positioned. In practice, this requires a light and easily displaceable measuring device.
One way of measuring length is disclosed in British Patent Specification No. 1 375 964, in which the length of short metal rods is measured by means of a measuring table supported on two supports by determining the loads exerted on the supports by a rod positioned on the measuring table, and by calculating the length of the rod on the basis of these loads. In the method, the distance between the supports has to be constant, and the length of the object to be measured has to be shorter than this distance (see e.g. page 1, lines 86 to 93 and page 2, lines 103 to 112). This implies that the length of the object to be measured must not exceed the length of the measuring table, so that the measuring of long boards, for instance, requires a very long, impractical measuring device which takes a lot of room.
Another method of measuring length is disclosed in British Patent Specification No. 1 065 021 and U.S. Pat. No. 3,175,438. Also in this case the metal rod to be measured is weighed at two points whereas the length of the object to be measured is not restricted to the length of the measuring platform. The device disclosed in U.S. Pat. No. 3,175,438 is, however, intended for cutting heavy metal rods, and the structure of the device is not suitable for an easily displaceable, light device for longitudinal measuring of objects such as long board goods.
The object of the present invention is to provide a method of measuring length which is suited for a rapid accurate and easy length measuring of objects of various lengths and in which the measuring range is not restricted by the length of the measuring device but covers all lengths needed in practice.
A further object of the invention is to provide a measuring device, preferably displaceable, for carrying out the method.
Still another object of the invention is to provide a method and a device which are suited for measuring the longitudinal and lateral dimensions of planar objects.
This is achieved by means of a method according to claim 1, which is characterized in that the object to be measured is weighed at least at three points out of which two are positioned apart from each other at a first distance from the stopper and the third is positioned at a second distance from a line going through said two weighing points, and that in the length measuring said first weighing result is formed by combining the weighing results from said two first-mentioned weighing points.
The length of the object to be measured can thus be calculated directly by means of the two distance measurements and the ratio of the weighing results obtained from the two points. The length of the object is not restricted to the distance between the supports nor to the length of the measuring platform. Since the length can be calculated on the basis of the ratio of the weighing results only, the method can be used, for example, for measuring objects of various types
REFERENCES:
patent: 3175438 (1965-03-01), Johnson
patent: 3216515 (1965-11-01), Roberts
patent: 4667757 (1987-05-01), Johnson
patent: 4785550 (1988-11-01), Wilkins
Alasaarela Esko L. I.
Turtinen Matti T.
Justing Electronics OY
Miller Jr. George H.
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