Geometrical instruments – Area integrators – Electrical
Patent
1983-01-26
1985-07-30
Stearns, Richard R.
Geometrical instruments
Area integrators
Electrical
33 43, 33468, G01B 514, B43L 1302
Patent
active
045312966
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for marking out workpieces.
Until now a usual method for marking out for example holes in for example I-beams involved measuring out the planned location of the holes in the web of the I-beam by means of a measuring tape, folding rule or the like and marking out this location on a flange of the I-beam, marking out the lines on which the holes have to be applied by means of a block square and a drawing point and further determining the location of the four holes on these lines by means of a measuring tape or a folding rule and marking this location with a center point. This method often gives rise to inaccuracies. For example with in particular wide I-beam there are created deviations in that the block square is placed against or above round edges of the beam. With narrower I-beams the space, to work in, plays a part. If the block square has been placed in a proper way, there are still possible deviations in that the drawing point with which the work piece is marked out is more or less tilted. With the measuring out and marking out of holes by means of a folding rule, all kinds of deviations are possible for reason such as more or less tilting of the drawing point, round edges of the I-beam, and lack of space, for example because the folding rule is longer than the width of the web of the I-beam.
The invention has as an object to provide a device for marking out workpieces with the above disadvantages eliminated. According to the invention this object is attained by a device comprising a sliding block provided with means for guiding thereof along the outer edge of the workpiece to be marked out with a vertical wall adapted to rest against the outer edge of the workpiece. A graduated horizontal bar-shaped guider is attached with one end to said sliding block at the upper side thereof and extends laterally therefrom, the device further comprising a holder for a pin-shaped marking out member. The holder is displaceable longitudinally of the bar-shaped guider from a starting position near the sliding block, corresponding with the zero-position of the graduation, the holder being provided with a vertical through bore for receiving and clamping a stiff-shaped marking out member so that in the said starting position the axis of the bore is lying in the plane of the inner surface of the vertical wall of the sliding block.
When working with the device according to the invention the round edges of for example I-beam to be marked out do not cause troubles because the sliding block is resting with its vertical wall against the outer edge of the workpiece and thus the position of said sliding block is determined univocally. Because in the starting position the axis of the bore in which a drawing point can be received is coincident with the inner surface of the vertical wall of the sliding block resting against the outer wall, the zero-position of the drawing point is determined univocally and the location to be measured out from that position of for example holes does not show deviations. Because the drawing point always is held in a vertical position in the vertical bore of the holder no deviations can be created by tilting of the drawing point. The space within which the work is to be done cannot play a part because the bar-shaped guider is extending along the upper side of the I-beam.
Of to an embodiment of a device according to the invention the holder for the member, which can consist of a drawing point or a center point or a combination thereof, is mounted to the guider which is secured to the sliding block. Thus the holder can be displaced along the bar-shaped guider. For marking out of for example holes the location of the holes in the web of the I-beam may be for example first measured longitudinally of the I-beam by means of a measuring tape after which the drawing point/center point will be placed at the measured location and the sliding block of the marking out device placed on one of the flanges of the I-beam. The proper location of the hole can be measured out through the
REFERENCES:
patent: 845009 (1907-02-01), Novak
patent: 964785 (1910-07-01), Johnson
patent: 1045695 (1912-11-01), Goldwater
patent: 1566509 (1925-12-01), Schwanz
patent: 2592877 (1952-04-01), Ellington
patent: 2619730 (1952-12-01), Carter
patent: 3284911 (1966-11-01), Clark
Sociaal Werkvoorzieningschap Zuidwest-Veluwe
Stearns Richard R.
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