H, E, WIMPERIS,
`ACGELEROMETER,
`APPLICATION FILED AUG, 12, 1910,
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`982,336.
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`Patented Jan, 24, 1911.
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`UNITED STATES PATENT OFFICE.‘
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`HARRY EGERTON WIMPEBIS, OF CHELSEA, LONDON, ENGLAND, 'ASSIG-NOB 0]!‘ (‘IE-
`EALF '.l.‘0 GEORGE KEITH BULLER ELPHINSTONE, OF LONDON, ENGLAND.
`Accnnnnoiunrnn. .
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`982,336.
`
`-, Patented Jan‘. 24, 1911.
`specification of Letters Patent.
`
`Applicationilled August 12, 1910.1 Serial No. 576;808.'
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`ots f the center of gravity of the mass being
`eccentric to the pivots. Part of the disk
`lies between the poles of a magnet g which
`damps its movements.
`.
`~
`Fast on the arbor e is a pinion It meshin
`with another pinion .23 fast on an arbor
`turning in ivots Z and carrying a mass m
`the center 0 gravity of,which is eccentric to
`the pivots, the movements of the two masses
`about their res ective axes being equal, while
`the centers 0
`avity normally lie in the
`plane through t e axes of the arbors e and
`/c. A light spring 7:. attached to the arbor e
`and to a bracket‘ 0 tends to bring the disk
`back to its zero position. The mass m car-
`ries an index 12 which moves over a gradu-
`ated scale
`.
`.
`'
`1' is a bra e adapted to lock the disk when
`not in use and actuated b a spring rod 3.
`The result of having t e moments of the
`two masses J and m equal’ about _their re-
`spective axes is that forces in the plane con-
`taining these two axw do not affect the read-
`in of the instrument.
`"
`hen it is desired to use the instrument
`to measure the acceleration of an automo-
`bile, for instance, it should be placed on the
`vehicle with the plane through the axes of
`the arbors e and 7:: at right angles to the di-
`rection of motion and the leveling screw
`should be adjusted until the needle comes to
`the ‘zero of the scale. If the vehicle is sub-
`ject to violent jolts it is well to check the
`accuracy of this adjustment from time to
`time during the run in order’ to make sure
`that
`the instrument has not been moved
`from its original position. Any accelera-
`tion due to the propelling force can then be
`seen from the movement of theneedle.
`Many a plications of this instrument will
`.occur to t e engineer, for instance if the ac-
`celerometer register n feet per second when
`going uphill and the speed remain constant
`then the gradient will be
`'
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`60
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`65
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`70
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`75
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`80
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`85
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`90
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`95
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`100
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`sin.
`
`In
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`9'
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`or approximately 1 in g/n.
`What I claim is :— _
`1. In an accelerometer, the combination
`of a pivoted mass having its center of grav-
`ity slightly removed from its pivot, a sec-
`ond pivoted mass also having its center of
`gravity slightly removed from its pivot,
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`105
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`110
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`IPRZO17-01058
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`Garmin EX1016
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`Page 2
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`To all whom it may concern:
`Be it known that I, HARRY Eamcroiv
`"'vVIMPERIS, a subject of the King of Great
`Britain,» residing at 28- Rossetti Garden
`Mansions, Chelsea, London, England, have
`invented a new and useful Accelerometer, of
`which the following is a specification.
`The primary object of this invention is to.
`provide an improved instrument for meas-
`uring the acceleration or retardation of a
`. vehicle, such as an automobile, a train or a
`shi
`, but the instrument may be used for
`various other purposes e. g. the determina-
`tion of gradients, of t e super-elevation of
`the curveof a railway line, of the angle of
`list or roll of a ship, of the power or efli-
`ciency “of an engine, and so on.
`The instrument consists essentially of a
`metallic massdelicately pivoted on its axis
`and‘ having its center of gravity slightly
`removed from such axis.
`In order to check
`or damp the movements of the mass I place‘
`it in the field of a magnet which is prefer-
`ably arranged so that a portion of the mass
`lies between the poles. The mass is con-
`veniently formed in the shape of a disk or of
`a portion of a disk. An index is moved by the
`movements of.the mass over a scale gradu-
`ated according to the purpose for which the
`instrument is to be used, and a light spring
`or gravitational control is arraiiged to bring
`-the mass back to a zero
`position.
`In order that the movements of the mass
`may be unaffected by the tilting of its axis
`in a plane perpendicular to the direction in
`which the acceleration is to be measured,
`I pivot upon a parallel axis a second eccen-
`tric disk or mass, fast with which is a pinion
`meshing_ with a pinion fast with the first-
`mass, the movements of the two masses about
`their respective axes being equal.
`I place a
`light spring control on one of the bodies and
`so arrange them that
`the two centers of
`gravity lie normally in the plane containing
`the two axes and either both between the
`axes or both outside them.
`The accompanying drawings show an in-
`strument made in accordance with this in-
`vention Figure 1 being a plan and Fig. 2
`a side elevation with the casing in section.
`I),
`a is a casing standin
`on three feet
`one of which is provide with a screw and
`milled head 0 for leveling.
`’
`d is the mass or disk, preferably of cop-
`55 I
`per, fast on an arbor e turning in fixed piv-
`
`20
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`a
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`‘25
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`3 0
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`35
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`40
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`45
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`50
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`gearing connecting the two masses, an index
`actuated by the movements of the masses
`and a spring control adapted to bring the
`index back to a zero position.
`2. In an accelerometer, the combination
`of a pivoted mass having its center of grav;
`ity slightly removed from its pivot, a second
`pivoted mass also having its center of grav- |
`ity slightly removed from its pivot, gearing
`
`Witnesses:
`
`982,836
`connecting the two masses, a magnet damp- 10
`ing their movements, an index actuated by
`the movements of the masses and a spring
`control adapted to bring the index back to a
`zero position.
`RRY.EGERTON WIMPERIS.
`? H. G. TIsDALL,
`L. G. WATKINs.
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