SU1221419A1 - Screw telescopic mechanism - Google Patents

Description

The invention relates to mechanical engineering and can be used in machining for automatic transfer of parts.

Purpose . the invention increases the reliability of the mechanism at increased screw rotation speeds.

FIG. 1 shows a helical telescopic mechanism, a general view / in FIG. 2 - the same, in the extended extreme position, a general view; in fig. 3 - unit 1 for interfacing the parts of the screw telescopic mechanism with each other in a guide.

The helical telescopic mechanism (Figs. 1 and 2) consists of body 1, inside of which are arranged telescopic cylindrical guides 2, 3 and 4, fixing Nfcie from axial rotation by longitudinal keys 5, and driving from pulley 6 of telescopic screw 7 consisting of screws 8, bearing on bearing 9, and hollow screws 10 and 11 resting on guides 2 and 3. Hollow screws 10 and 11 are equipped with internal nuts along which they are fixed to each other and with a screw 8 In the radial direction, hollow screws 10 and 11 (FIG. 3) mate with the cylindrical neck with guides 2 and 3, and in the axial direction, elastic friction pads 12 and 13 on one side and radially different rings 14 and 15 fixed on the ends of the guides 2 and 3 and producing their mutual fixation in the axial direction, on the other parties. The axially mating hollow screws 10 and 11 between themselves and the guide 4, the screw 8 and the washer 16 covering the bearing 9 are made by elastic friction pads 17-20.

Screw telescopic mechanism works as follows.

In the initial position (Fig. 1), the rotation from the drive is transmitted through the pulley 6 and the screw 8, the thread of which begins to move the hollow screw 10 connected to the guide 2 ring 14 to engage the screw 8 through the elastic friction gasket 19. Thereafter, joint rotation begins screws 8 and 10, with

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which, along the thread of the latter supported on the guide 2, begins to move the hollow screw 5 11 connected to the guide 3 ring 15 to engage the hollow screw 10 through the elastic friction gasket 17, after which the joint rotation of screws 8, 10 and 11, in which along the thread of the latter, 10 resting on the guide 3, the guide 4 begins to move before engaging with the hollow screw 11 through the elastic friction lining 15

ku 18.

When the drive rotates in the opposite direction, the hollow screw 10 clings with the screw 8, the thread of which begins to move the hollow screw 10 connected to the guide 2 until it engages with the screw 8 on the elastic ring through the washer 16 and the elastic friction gasket 20, after which joint rotation begins paired screws 8 and 10, and the hollow screws 11 and 10 are disengaged, in which the joint, which rests on the thread of the latter, supported by guide 2, begins to move

from the guide 3, the hollow screw 11, before engaging with the guide 2 through the elastic friction gasket 12, after which the combined rotation of the twin screws 8, 10 begins and

11, and the guide 4 and the hollow screw 11 are uncoupled, when the thread 4 of the latter resting on the guide 3 begins to move the guide 4 up to the stop into the guide 3 through the elastic friction gasket 13. At the moment of the screws screwing together With a friend or with guides, elastic friction gasket is twisted along the contact surface of the latter through elastic friction gaskets. The elastic friction gasket twists the torque, which is opposite to the torque of the screw, thereby preventing the screws from jamming. At the moment of unscrewing the screws with each other and with the guides, when the direction of rotation changes, the twisted elastic friction gaskets will act on the screws

the accumulated torque together with the working torque, facilitates the disengagement of the screws and interrupts the possibility of increasing

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increase. moment to disengage the common limits of elasticity of materials and. screws that would otherwise cause the surfaces to seize may reach values that exceed the contact of the screws.

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Compiled by R. Ozhin editor A. Revin Tehred O. Gortvay Proofreader S, Cherni

Order 1567/43 Circulation 880 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch 1ShP Patent, Uzhgorod, st. Project, 4

reg.

Claims (1)

SCREW TELESCOPIC MECHANISM, comprising a housing, telescopic rails placed in it and a telescopic screw mounted with the possibility of moving relative to them, characterized in that, in order to increase reliability in operation at increased rotational speeds of the screw, each subsequent part of the telescopic screw has an annular groove on its outer surface, and the mechanism is equipped with supports made in the form of radially split rings placed in annular grooves and interacting with the front of the corresponding guide, and elastic friction pads located between the parts of the telescopic screw and between the latter and the corresponding part of the guides. figure 1 <