Micro-movement subassembly for angle adjustment

Abstract

A micro-movement subassembly as a precise driving screw for angle adjustment, comprising a shank, a turnbuckle, and a central cylindrical shaft. The subassembly is precise for linear displacement, good orientation, stable and reliable adjustment, which can be used for a variety of precision-oriented precision micro-angle adjustment of the drive screw.

Claims

1. A micro-movement subassembly, comprising a shank having a first end, a second end, an inner hole near the first end inside the shank, an inner wall of an internally threaded hole near the second end inside the shank, and an outside surface that has a first half section near the first end and a second half section near the second end, a turnbuckle having a first end, a second end, an inside hole with an inner surface, and an outside surface, and a central cylindrical shaft having a first end, a second end, and an outside surface, wherein the shank is a cylindrical step cylinder, the first half section of the outer surface is knurled, and the second end has a slope that is circularly marked with a scale according to a pitch; the turnbuckle is a hollow shaft, the inner surface of the inside hole of the turnbuckle is precision machined to have a precise screw thread, and the outside surface of the turnbuckle has a first part near the first end of the turnbuckle, a step cylinder in the middle, and a second part near the second end of the turnbuckle, and both the first and second parts of the turnbuckle have outer threads; the outer thread of the first part of the outside surface of the turnbuckle is assembled in the internally threaded hole of the inner wall near the second end of the shank, the outside surface of the step cylinder in the middle of the turnbuckle is marked with a scale in a range of length along a central axial of the turnbuckle, the scale on the outside surface of the step cylinder in the middle matches the scale on the slope of the second end of the shank to show the length traveled and degree of precision; and the first end of the central cylindrical shaft fits transitionally or interferentially with the inner hole near the first end of the shank, the central cylindrical shaft goes through the hollow shaft of the turnbuckle and the outside surface of the central cylindrical shaft fits inside the inside hole of the turnbuckle through the precise screw thread, and the second end of the central cylinder shaft has a spherical surface for driving an object by point contact.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a cross sectional view of the micro-movement subassembly of the present invention.

(2) FIG. 2 shows structure of the shank in the micro-movement subassembly of the present invention, where FIG. 2(a) shows a cross section of the shank, and FIG. 2(b) shows the surface view of the shank.

(3) FIG. 3 shows the structure of the turnbuckle in the micro-movement subassembly of the present invention, where FIG. 3(a) shows a cross section of the turnbuckle, and FIG. 3(b) shows the surface view of the turnbuckle.

(4) FIG. 4 shows the surface view of the central cylindrical shaft in the micro-movement subassembly of the present invention.

(5) Reference numbers in the figures denote the following components: 1shank; 2turnbuckle; 3central cylindrical shaft; 11inner hole of the cylindrical step cylinder; 12internally threaded hole of the inner wall of the cylindrical step cylinder of shank 1; 13slope; 14scale on the slope 13; 23afirst side of the turnbuckle 2; 23bsecond side of the turnbuckle 2; 24step cylinder in the middle of the turnbuckle 2; 25scale on the step cylinder 24 in the middle of the turnbuckle 2; 31spherical surface at the second end of the cylindrical shaft 3.

DETAILED DESCRIPTION OF THE INVENTION

(6) In connection with FIGS. 1 to 4, the present invention is further explained in details.

(7) As shown in FIGS. 1 to 4, the micro-movement assembly of the present invention comprises a shank 1, a turnbuckle 2, and a cylindrical shaft 3.

(8) As shown in FIGS. 1 and 2(a)-2(b), shank 1 is a cylindrical step cylinder with an inner hole 11 on the left side for the transition or interference fit with the central cylindrical shaft 3. The inner wall of the cylinder is formed of internally threaded hole 12. The right side of the hole 12 is out of the turnbuckle (2) thread outer circle. The outer surface of the cylindrical step cylinder has the left half section that is knurled and the right half of the outer surface has a slope 13 at the end. The outer circular surface around the end of the slope 13 is marked with the scale 14 according to the pitch.

(9) As shown in FIGS. 1 and 3(a)-3(b), turnbuckle 2 is a hollow shaft with outer thread on the two side, 23a and 23b, and a step cylinder 24 in the middle. The surface of hollow shaft is precise machined. The left outer thread is assembled with the inner thread of the internally threaded hole 12 on the shank (1). The cylinder 24 in the middle has a surface A that is marked with a length range in a scale along the axial center line, where the scale is matched with the scale 14 of the slope 13 for showing the travel range and precision.

(10) As shown in FIGS. 1 and 4, central cylindrical shaft 3 has a spherical surface 31 at one end. The central cylindrical shaft 3 is assembled inside the hollow shaft of turnbuckle 2.

(11) Turnbuckle 2 is assembled in the inside cylinder of shank 1 with precise screw thread. Central cylindrical shaft 3, having a spherical surface 31 at one end, is inserted in the precise hollow shaft of turnbuckle 2 at the other end while transition or interference assembled with the central cylinder of the shank 1 into a complete assembly. The spherical surface 31 at the end of cylindrical shaft drives an object by point contact.

(12) Cylindrical shaft 3 is inserted into turnbuckle 2 by sliding smoothly for leading liner displacement. Turnbuckle 2 is fine assembled with shank 1 by thread sequentially. Then, one end of the central cylinder shaft 3 is connected with the central cylinder of the shank 1 through a transition or interference fit. Once turnbuckle 2 is fixed thereon, when the shank is turned clockwise, the central cylindrical shaft is driven forward precisely along the thread between them. When the shank is turned counterclockwise, the central cylindrical shaft is driven backward precisely along the thread.

(13) The angle position may be adjusted precisely by turning the shank to drive the central cylindrical shaft. The displacement is about A mm. Experiment shows that the linear displacement in the assembly of the present invention is accuracy without gap error and the movement is reliable, thus, the assembly may be used as a precise angle adjustment screw.

(14) The scope of the present invention is not limited by the detailed descriptions, and one of ordinary skill in the art could modify and change the structure of the micro-movement assembly without departing from the scope of the present invention.