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, a turnbuckle, and a central cylindrical shaft, wherein the shank is a cylindrical step cylinder that comprises an inner hole on the left end for transitional or interference fit with the central cylindrical shaft and an inner wall of an internally threaded hole on the right for fit with outside surface of the turnbuckle, the turnbuckle is a hollow shaft that comprises the outside surface for fit in the internally threaded hole and an inside hole for fit with the outside of the central cylindrical shaft, and the central cylindrical shaft comprises a spherical surface on one end and fits inside the inside hole of the turnbuckle.

2. The micro-movement subassembly according to claim 1, wherein the left half section of the outer surface of the cylindrical step cylinder is knurling, the right half section of the outer surface of the cylindrical step cylinder is a slope belt, and the outer circle surface of the slope is marked with same scale according to a pitch.

3. The micro-movement subassembly according to claim 1, wherein the turnbuckle is a hollow shaft having an outer thread on the two sides and a step cylinder in the middle; the surface of the hollow shaft is precise machined to have a precise screw thread; the left outer thread is assembled with the inner thread of the shank; and the middle cylinder surface is marked with a length range of a stroke along an axial center line, that is matched with a slope precision scale to express travel range and precision.

4. The micro-movement subassembly according to claim 1, wherein the central cylindrical shaft is assembled in the inside hole of turnbuckle.

5. The micro-movement subassembly according to claim 1, wherein the turnbuckle is assembled in the internally threaded hole of the shank with the precise screw thread, the central cylindrical shaft has the end with spherical surface being inserted in and through the hollow shaft of the turnbuckle and the other end being transition or interference assembled with the center of the cylindrical step cylinder of the shank into a whole subassembly, and the spherical surface at the end of the central cylindrical shaft drives an object by point contact.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG. 1 shows a cross sectional view of the micro-movement subassembly of the present invention.

[0013] 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.

[0014] 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.

[0015] FIG. 4 shows the surface view of the central cylindrical shaft in the micro-movement subassembly of the present invention.

[0016] Reference numbers in the figures denote the following components: 1shank; 2turnbuckle; 3central cylindrical shaft.

DETAILED DESCRIPTION OF THE INVENTION

[0017] In connection with FIGS. 1 to 4, the present invention is further explained in details.

[0018] 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.

[0019] As shown in FIGS. 1 and 2(a)-2(b), shank 1 is a cylindrical step cylinder with an inner hole on the left side for the transition or interference fit with the central cylindrical shaft. The inner wall of the cylinder is formed of internally threaded hole. The right side of the hole is out of the turnbuckle (2) thread outer circle. The outer cylinder has the left half section that is knurling and the right for the outer surface that is slope belt. The outer circle surface of the slope is marked with the same scale according to the pitch.

[0020] As shown in FIGS. 1 and 3(a)-3(b), turnbuckle 2 is a hollow shaft with outer thread on the two side and a step cylinder in the middle. The surface of hollow shaft is precise machined. The left outer thread is assembled with the inner thread on the shank (1). The middle cylinder surface A is marked with the length range of the stroke along the axial center line, which is matched with the slope precision scale to express the travel range and precision.

[0021] As shown in FIGS. 1 and 4, central cylindrical shaft 3 has a spherical surface at one end. The central cylindrical shaft is assembled inside the hollow shaft of turnbuckle 2.

[0022] Turnbuckle 2 is assembled in the inside cylinder of shank 1 with precise screw thread. Central cylindrical shaft 3, having a spherical surface at end, is inserted in the precise hollow shaft of turnbuckle 2 at the other end while transition or interference assembled with the the central cylinder of the shank 1 into a complete assembly. The spherical surface at the end of cylindrical shaft drives an object by point contact.

[0023] 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.

[0024] 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.

[0025] 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.