Geometrical instruments – Gauge – Collocating
Reexamination Certificate
1999-03-30
2001-08-07
Gutierrez, Diego (Department: 2859)
Geometrical instruments
Gauge
Collocating
C033S556000, C033S559000, C033S710000, C033S832000
Reexamination Certificate
active
06269546
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a head for the linear dimension checking of mechanical pieces, including a support element that defines a longitudinal geometrical axis, a movable armset with an arm, movable with respect to the support element, and a feeler coupled to the arm, a fulcrum, coupled to the arm and the support element, for defining a rotation axis and enabling limited rotational displacements of the arm about the rotation axis with respect to the support element, and a transducer, coupled to the arm and the support element, for providing signals depending on the position of the arm with respect to the support element.
The invention further relates to a head for the linear dimension checking of mechanical pieces, including a support element that defines a longitudinal geometrical axis, a movable armset with an arm, movable with respect to the support element, and a feeler coupled to the arm, a fulcrum, coupled to the arm and the support element, for enabling limited rotational displacements of the arm with respect to the support element, a retraction device coupled to the support element and adapted to cooperate with the movable arm for bringing the arm to a definite inoperative position, and a transducer, coupled to the arm and the support element, for providing signals depending on the position of the arm with respect to the support element. The invention refers also to a process for manufacturing a fulcrum to be utilized in a head for the dimension checking.
BACKGROUND ART
There are known many types of gauging or measuring heads for the inspection of mechanical pieces in benches, transfer lines or in the so-called in-process applications in the course of the machining in machine tools.
In the known heads, the fulcrum, that couples the movable arm to a fixed support and must ensure particularly precise displacements of the arm, is achieved by either a material removal, i.e. a manufacturing process that involves delicate and costly mechanical machinings, or the arrangement, between the arm and the support, generally by removable couplings, of suitable devices for allowing arm displacements, i.e. an arrangement also requiring the utmost precision and, consequently, considerable time and costs.
In other heads, like the ones shown in U.S. Patent U.S. Pat. No. 3,946,492, an unfixed frame member carrying a feeler arm is movably coupled to a fixed base by means of a pair of spaced apart parallel leaf springs. The leaf springs allow substantially linear and parallel displacements of the feeler arm relative to the base, and render the heads unsuitable for checkings where there is shortage of room, such as in many in-process applications. Among other constructional features, the heads shown in the U.S. patent include retraction/release devices, e.g. with a bellows (
FIG. 2
) and a lever spring, the former being mechanically secured on one side to the fixed base and on the other side to such lever spring. The lever spring is, on its turn, pivotably connected to a fixed enclosure of the head, and cooperates with both a trasversal leg integral with the movable arm, and a biasing wire spring that also biases against such transversal leg. The dimensions and shapes of the lever and wire springs have to be precisely dimensioned so that in a non operative condition the unfixed member is retracted, whereas applying vacuum to the interior of the bellows, the action of the biasing wire spring prevails, and the unfixed member is released.
DISCLOSURE OF THE INVENTION
Object of the present invention is to provide a gauging or measuring head for the linear dimension checking of mechanical pieces that guarantees high standards of repeatability and accuracy, and is more compact, versatile and less expensive with respect to the known heads.
This and other objects are achieved by a head according to claims
1
and
23
.
A further object of the invention is to obtain a precise fulcrum for gauging or measuring heads in a particularly economic, rapid and reliable way.
This and other objects are achieved by a manufacturing process according to claim
32
.
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Dickstein , Shapiro, Morin & Oshinsky, LLP
Guadalupe Yaritza
Gutierrez Diego
Marposs Societa ' per Azioni
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