Adjustable cross hair assembly
OwnerDavy S. Loganinventor
Life of this patent
Estimating the term…
Abstract
A cross hair assembly has an adjustable cross hair intersection point to facilitate calibration of the cross hair assembly relative to the optical axis of an associated x-ray radiation source. Each cross hair has a fixed anchorage on a mounting frame, and an adjustable anchorage on the mounting frame. By selectively adjusting the adjustable anchorages it is possible to change the cross hair intersection point. Each cross hair is a steel wire having a relatively small diameter; a coil spring is included in each fixed anchorage for holding the wire in a taut condition free from sagging or bending.
Claims15
A cross hair assembly comprising an annular frame;
- a first cross hair extending across said frame, a second cross hair extending across said frame in orthogonal relation to said first cross hair;
- a fixed anchorage on said frame for each cross hair;
- an adjustable anchorage on said frame for each cross hair;
- each cross hair having a first end connected to the associated fixed anchorage, and a second end connected to the associated adjustable anchorage;
- each said adjustable anchorage comprising a slidable anchorage element slidably mounted on said frame for adjusting movements normal to the direction taken by the associated cross hair;
- and
- said adjustable anchorages being independently adjustable to vary the intersection point of the cross hairs.
A cross hair assembly comprising an annular frame having a central axis;
- a first cross hair extending across said frame, a second cross hair extending across said frame;
- said cross hairs having an orthogonal relationship, whereby the cross hairs intersect each other in the vicinity of the frame central axis;
- each cross hair having a first end and a second end;
- a fixed anchorage on said frame for each cross hair;
- each fixed anchorage comprising a first enlargement on the first end of the respective cross hair, a tubular plunger having a recess therein for accommodating said first enlargement, a bore communicating with said recess so that the cross hair extends through the bore, and spring means biasing said plunger away from the frame central axis so that the associated cross hair is in a tensioned condition;
- an adjustable anchorage on said frame for each cross hair;
- each adjustable anchorage comprising two spaced bearings mounted on the frame, a block slidably mounted on the frame between said bearings, and a rotary screw extending through said block;
- each screw having smooth-surfaced shaft portions rotatably mounted in said bearings, whereby rotation of the shaft moves the associated block toward one bearing and away from the other bearing;
- each said block having a keyhole slot;
- and
- a second enlargement on the second end of each cross hair mated to an associated keyhole slot, whereby each cross hair is detachably connected to an associated block.
Dependencies are inferred from the claim text.