Displacement measuring device

Details Displacement measuring device Displacement measuring device

2002-12-06

2004-02-17

Gutierrez, Diego (Department: 2859)

Geometrical instruments

Distance measuring

Machine parts

C033S0010PT, C033S0010DD, C033S773000, C033S735000, C033S753000

Reexamination Certificate

active

06691424

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a displacement measuring device that includes a gear mounted to shaft and engaged with a rack. The gear is pushed toward the rack by a spring so that the displacement of the diameter of the revolutions of the shaft can be precisely measured.
BACKGROUND OF THE INVENTION
A conventional displacement measuring device for measuring the sum of displacement of the diameter of a shaft is shown in FIG.
1
and generally includes a body
10
which is moved transversely relative to rails and a shaft
11
is rotatably connected to the body
10
and driven by a driving means which is not shown in the drawings. A gear
14
is mounted to the shaft
11
and a rack
16
is engaged with the gear
14
. When the body
10
is moved, the gear
14
engaged with the rack
16
rotates and the number of the revolution of the gear
14
is counted by a counting member
13
connected to an end of the shaft
11
. The sum of the displacement of the object
10
can be measured by calculating the number of revolution of the shaft
11
times the diameter of the shaft
11
. As shown in
FIG. 2
, there is a gap “D” between the tooth of the rack
16
that is engaged with the tooth of the gear
14
. In other words, a tolerance is generated when a tooth of the gear
14
engages with the tooth of the rack
16
so that the sum of the displacement of the object
10
is not precise enough.
The present invention intends to provide a displacement measuring device wherein a spring pushes the gear toward the rack so that the gap “D” is reduced and the tolerance is reduced.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a displacement measuring device which comprises a body which is movable on a plurality of rails and an extension portion is connected to the body and includes a spring received therein. A first shaft and a second shaft are connected to the body which is driven by the first shaft. A first gear and a second gear are respectively mounted to the first shaft and the second shaft. The second shaft extends through the extension portion and a counting member is connected to the second shaft. A rack is engaged with the first gear and the second gear. The spring pushes the second shaft so as to push the second gear toward the rack.


REFERENCES:
patent: 1863007 (1932-06-01), Elkins
patent: 2105703 (1938-01-01), Self
patent: 2488237 (1949-11-01), Raible
patent: 2568524 (1951-09-01), Verderber
patent: 3926062 (1975-12-01), Neff

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