GONIOMETER HEAD FOR X-RAY DIFFRACTION APPARATUS WITH IMPROVED X- OR Y-MOTION MECHANISM

• US 3,628,761 A
• Filed: 10/01/1969
• Issued: 12/21/1971
• Est. Priority Date: 10/01/1969
• Status: Expired due to Term

• Current Assignee: Roy L. Thomas Jr
• Original Assignee: Roy L. Thomas Jr
• Inventors: Thomas, Roy L. Jr.
• Application Number:
  US04/862,896
• Time in Patent Office: 811 Days
• US Class Current: 248/184.1
• CPC Class Codes: F16M 11/045 adapted to left-right translation movement
• CPC Class Codes: F16M 11/2092 comprising means allowing depth adjustment, i.e. forward-backward translation of the head relatively to the undercarriage
• CPC Class Codes: F16M 2200/025 for translational movement

Abstract

A goniometer head for securing and positioning a crystal specimen in X-ray diffraction apparatus-more particularly, an Xor Y-motion mechanism comprising a frame defining a channel within which is received a dovetailed carriage side-driven by a manually rotatable screw disposed parallel to and contiguous with the carriage. A carriage loading structure biases the screw transversely against the carriage and also functions to lock the carriage in the channel.

Claims

1. In a goniometer head for X-ray diffraction apparatus having crystal position adjustment means providing two mutually orthogonal arcuate crystal motions, a mechanism for providing a translational crystal motion on an axis orthogonal to the longitudinal axis of the head, comprising:

carriage support means defining a channel oriented along said orthogonal axis, said channel having a bottom surface and on one side a sloping side surface defining a female dovetail;

a carriage received in and slidable along said channel, said carriage having a sloping first side defining a male dovetail received in and mating with said female dovetail of said channel, and an opposite second side having a surface component sloping oppositely from first side, said carriage having on said second side threadlike means adapted to operatively engage a driving instrumentality;

screw means disposed loosely in said channel contiguous with and parallel to said second side of said carriage, said screw means having a manually accessible end and a threaded portion engaging said threadlike means on said second side of carriage for effecting, upon rotation of said screw means, a translation of said carriage in said channel;

support means supporting said screw means loosely transverse to said orthogonal axis to allow rotation thereof but retaining said screw means against longitudinal movement; and

adjustable carriage-loading means for placing a variable compressive side loading on said screw means to urge said screw means against said surface component of said second side of said carriage and to thereby urge said male dovetail on said first side of said carriage into firm and stable engagement with said female dovetail on said channel.

2. The apparatus defined by claim 1 wherein said threadlike means on said carriage comprises grooves lying respectively in planes perpendicular to said orthogonal axis and engageable with a small fraction of the circumference of said threaded portion of said screw means.

3. The apparatus as defined by claim 2 wherein said adjustable carriage-loading means comprises means defining an internally threaded bore arranged transverse to said screw means, a carriage loading screw in said bore, a pressure pad aligned with said bore and engaging said screw means, and compression spring means in said bore between said carriage loading screw and said pad, rotation of said carriage loading screw causing an adjustment of the loading applied by said pad upon said screw means.