RU1776973C - Micrometer mechanism - Google Patents

Abstract

The invention relates to mechanical engineering and instrumentation, in particular to measuring devices. The purpose of the invention is to improve the usability of the mechanism. The micrometric mechanism comprises a base, a screw-nut placed on it, located axially with the nut axially movable, the sleeve interacting with the sleeve, a spring-loaded sleeve and a drum covering the sleeve. The mechanism is equipped with a collet located coaxially to the screw with an annular protrusion on the inner surface of the petals interacting with a cylindrical ring placed in the annular groove on the smooth part of the screw. 4 ill.

Description

The invention relates to mechanical engineering and instrumentation, in particular to measuring devices.

A known micrometric mechanism comprising a screw, a housing with a nut equipped with means to eliminate play in the screw-nut connection, a drum associated with a screw, a spring-loaded retaining sleeve interacting with a split spring retaining ring associated with the housing, and cylindrical, spring-loaded with a radial the direction of the fingers interacting through the thrust pins with the bevels of the locking sleeve.

A disadvantage of the known device is the need to hold the fingers of the locking device while turning the drum of the micrometric mechanism, which is inconvenient when it is necessary to rotate it by an angle greater than 180 ° to achieve the desired position of the screw.

The purpose of the invention is to improve the usability of the micrometric mechanism.

This goal is achieved in that in a micrometric mechanism comprising a screw, a housing with a nut provided with means for eliminating play in a screw-nut connection, a drum associated with a screw, a spring-loaded retaining sleeve cooperating with a split spring retaining ring associated with the housing, and cylindrical, radially spring-loaded fingers interacting by means of thrust pins with bevels of the locking sleeve, the smooth part of the screw is made with an annular groove in which the cylindrical the ring is axially movable within the groove, and the locking sleeve is provided with a collet rigidly connected to it, coaxially located on a smooth screw shaft and interacting with a cylindrical ring, the inner surface of the collet having an annular protrusion at the ends of the petals, and on the outer the diameter of the movable cylindrical ring on the side of the annular protrusion of the collet is a chamfer.

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In FIG. 1 shows a micrometric mechanism, a longitudinal section; in FIG. 2-4 - node I in FIG. 1 in various phases of operation of the micrometric mechanism.

The mechanism consists of a platform 1, a housing-nut 2 with means to eliminate play in the thread (not shown), a screw 3 with a smooth part 4 and an annular groove 5 rigidly connected to the drum 6. A cylindrical ring 7 is placed in the groove with the possibility of axial movement , Coaxially with the smooth part of the screw, the locking sleeve 8 is located, which interacts with a split spring locking ring 9 connected to the housing 2. The locking sleeve 8 is locked to a split spring ring by a spring 10. In the longitudinal grooves x 11 of the locking sleeve 8, combined with the hole 12 in the smooth part A of the screw 3, are placed spring-loaded cylindrical fingers 13 with stop pins 14 interacting with the bevels 15 of the locking sleeve 8. The collet petals 16 are rigidly connected to the central part of the sleeve 8, covering the smooth part 4 screws 3 and having the ability to interact with the annular groove 5 and the cylindrical ring 7. The inner surface of the collet is made with an annular protrusion 7 at the ends of the petals 16, and on the outer diameter of the movable cylindrical ring 7 from the side of face ledge 17 collet chamfer 18 is made.

The micrometric mechanism works as follows. When the cylindrical fingers 13 are pressed, the stop pins 14, interacting with the bevels 15 of the lock sleeve 8, move it to the left (according to the drawing), deforming the spring 10. The lock sleeve 8 disengages from the split spring lock ring 9. The drum is released. When the petals 16 of the collet are trapped into the groove 5 (Fig. 2), the locking sleeve 8 is fixed. It becomes possible to rotate

screw 3 by releasing spring fingers 13. When screw 3 reaches the desired position, drum 6 stops as follows. Presses on cylindrical

fingers 13, further move the locking sleeve 8 to the left. While the inner part of the annular protrusion 17 of the petals 16 interacts with the chamfer 18 of the cylindrical ring 7. Petals 16 collet

are extended, covering the cylindrical ring 7 (Fig. 3). When the cylindrical fingers 13 are released, the locking sleeve 8 moves to the right under the action of the spring 10, entrapping the clamped petals 16

collet ring 7 until it touches the right edge of the groove 5. In this case, the collet freely passes to the smooth part 4 of the screw 3. The locking sleeve 8 is engaged with a split spring ring 9, fixing the drum 6

and associated screw 3.

Thus, the invention allows, by introducing the fixing of the locking sleeve, to increase the usability of the micrometric mechanism.

Claims (1)

SUMMARY OF THE INVENTION A micrometric mechanism comprising a base, a screw-nut located thereon, arranged coaxially with a nut with the axial movement of the sleeve, interacting with the sleeve, axially spring-loaded sleeve, and covering the sleeve drum, rigidly connected to the screw, characterized in that, for the purpose to increase the convenience of operation, an annular groove is made on the smooth part of the screw, the mechanism is equipped with a collet located coaxially to the screw and rigidly connected to the sleeve on the inner surface of the petals of which an annular protrusion is made with a chamfer that can be moved along the groove with a cylindrical ring, on the outer surface of which a chamfer is made, designed to interact with the chamfer of the collet protrusion. FIG. 1 / b Fig 2 h% 1, .GTTTZu l Fig.Z Fig C