CN210461293U

CN210461293U - Reverse fastening screw

Info

Publication number: CN210461293U
Application number: CN201921230540.3U
Authority: CN
Inventors: 吴寿武
Original assignee: Wenzhou Kaian Auto Parts Co Ltd
Current assignee: Wenzhou Kaian Auto Parts Co Ltd
Priority date: 2019-08-01
Filing date: 2019-08-01
Publication date: 2020-05-05
Anticipated expiration: 2029-08-01

Abstract

The utility model discloses a reverse fastening screw, its characterized in that: the screw rod is in threaded connection with the inner hole of the screw rod sleeve in a penetrating mode from the inner hole of the screw rod sleeve, a pressing block is arranged below the bottom of the screw rod sleeve and connected to the lower rod end of the screw rod, relative rotation can be conducted between the pressing block and the lower rod end of the screw rod, a limiting block is fixed on the bottom end face of the screw rod sleeve, the limiting block is used for conducting circumferential limiting on rotation of the pressing block, and the pressing block can rotate synchronously with the screw rod when not in contact with the limiting block; the pressing block is at the rotation starting position, the whole periphery of the outer edge of the pressing block is positioned in the extension space surrounded by the excircle of the screw rod sleeve, and the local periphery of the outer edge of the pressing block can leave the extension space surrounded by the excircle of the screw rod sleeve at the rotation finishing position. The utility model discloses can compress tightly the union piece down from the bottom direction, solve the bottom and do not have the space and the union piece does not offer the upper and lower connector connection problem under the screw hole occasion down.

Description

Reverse fastening screw

Technical Field

The utility model relates to a fastener product, concretely relates to reverse fastening screw.

Background

For the connection between the upper and lower connecting pieces, a bolt fastening mode is adopted many times, at this time, a threaded hole is generally required to be arranged in the mounting hole of the lower connecting piece, if the threaded hole cannot be arranged in the mounting hole of the lower connecting piece, a nut is screwed up from the bottom of the bolt, and the lower connecting piece is fastened by screwing the nut, but when the bottom space of the lower connecting piece is small, the mounting hole is internally arranged or the nut cannot be arranged and pulled, the connection of the upper and lower connecting pieces at this time has problems.

Disclosure of Invention

The utility model aims to solve the problems of the prior art, and provides a reverse fastening screw which can compress a lower connecting piece from the bottom direction and can solve the problem that the bottom has no space and the lower connecting piece can not be used for connecting the upper and lower connecting pieces under the threaded hole.

The utility model discloses a through following technical scheme implementation:

reverse fastening screw, its characterized in that: the screw rod is in threaded connection with the inner hole of the screw rod sleeve after penetrating through the inner hole of the screw rod sleeve, a pressing block is arranged below the bottom of the screw rod sleeve and connected to the lower rod end of the screw rod, the pressing block and the screw rod can rotate relatively, a limiting block is fixed on the bottom end face of the screw rod sleeve, the limiting block is used for circumferentially limiting the rotation of the pressing block, and the pressing block can synchronously rotate along with the screw rod when not in contact with the limiting block; the pressing block is at a rotation starting position, the whole periphery of the outer edge of the pressing block is positioned in an extension space surrounded by the excircle of the screw rod sleeve, and the local periphery of the outer edge of the pressing block can leave the extension space surrounded by the excircle of the screw rod sleeve at a rotation finishing position; the compact heap is eccentric circle and takes local breach, and local breach corresponds the stopper, and the excircle diameter of eccentric circle equals or is less than the telescopic excircle diameter of screw rod.

Above-mentioned technical scheme's reverse fastening screw, the theory of operation is: in will pressing down the bolt from last mounting hole down inserting upper and lower connector, the telescopic excircle of screw rod adopts interference fit with the mounting hole of last connector, after pegging graft targets in place, toward withdrawing from the screw rod sleeve direction and twisting the screw rod, the compact heap rotates along with the screw rod is synchronous, after the biggest angle is rotated to the compact heap, the stopper can be touch to the compact heap, then the compact heap stop rotating, the outer fringe periphery of compact heap has at this moment the part and has left the epitaxial space that the screw rod sleeve excircle enclosed, continue to twist the screw rod, the screw rod can drive the compact heap lifting, make the compact heap compress tightly the connector from following direction to lower connector. Because the lower connecting piece can be pressed from the bottom direction, the problem of connection of the upper and lower connecting pieces under the condition that the bottom has no space and the threaded hole cannot be formed in the lower connecting piece is solved. In addition, the pressing block is an eccentric circle and is provided with a local notch, so that the periphery of the outer edge of the pressing block has a maximum area and is partially separated from an extension space surrounded by the outer circle of the screw sleeve when the pressing block is at the maximum rotation angle position, and the lower connecting piece can be reliably fastened.

Drawings

The utility model discloses there is following figure:

figure 1 is a schematic structural diagram of the present invention (the compact block is at the rotation initial position),

figure 2 is a bottom view in elevation of figure 1,

figure 3 is a schematic structural diagram of the present invention (the compact block is at the final rotation position),

fig. 4 is a bottom view of fig. 3.

Detailed Description

As shown in the figures, the reverse fastening screw of the utility model comprises a screw sleeve 1 and a screw 2, an interference fit is arranged between an outer circle 4 of the screw sleeve 1 and a mounting hole of an upper connecting piece A, an eccentricity is arranged between an inner hole 3 of the screw sleeve and the outer circle 4 of the screw sleeve, the screw 2 passes through the inner hole 3 of the screw sleeve and is screwed with the inner hole 3 of the screw sleeve, a pressing block 5 is arranged below the bottom of the screw sleeve 1, the pressing block 5 is connected with the lower rod end of the screw 2, a transition fit is arranged between the inner hole of the pressing block 5 and the outer circle of the lower rod end of the screw 2, the pressing block 5 and the screw 2 can rotate relatively, the lower rod end of the screw 2 is fixedly connected with a baffle ring 6, the baffle ring 6 is arranged below the pressing block 5, a limiting block 8 is fixed on the bottom end face of the screw sleeve 1, the limiting block 8 carries out circumferential limiting on the rotation of, the pressing block 5 can synchronously rotate along with the screw rod 2; in the initial rotation position (shown in fig. 1 and 2), the whole of the periphery of the outer edge of the pressing block 5 is located in the extension space surrounded by the outer circle 4 of the screw sleeve, and in the final rotation position (shown in fig. 3 and 4), part of the periphery of the outer edge of the pressing block 5 is away from the extension space surrounded by the outer circle 4 of the screw sleeve. Compact heap 5 is eccentric circle and takes local breach 7, and local breach 7 corresponds stopper 8, the excircle diameter of eccentric circle slightly is less than the excircle diameter of screw rod sleeve 1, generally have 0.5mm can.

The reverse fastening screw can compress the lower connecting piece B from the bottom direction, when in use, the lower fastening bolt is inserted into the mounting holes of the upper connecting piece A and the lower connecting piece B from top to bottom until the lower connecting piece B is inserted in place, because the excircle 4 of the screw sleeve 1 is in interference fit with the mounting hole of the upper connecting piece A, the screw sleeve 1 and the upper connecting piece A are fastened together, then the screw 2 is screwed in the direction of withdrawing the screw sleeve, the pressing block 5 rotates synchronously along with the screw 2, after the pressing block 5 rotates for the maximum angle, the pressing block 5 touches the limiting block 8, then the pressing block 5 stops rotating, at the moment, the periphery of the outer edge of the pressing block 5 partially leaves an extension space surrounded by the excircle 4 of the screw sleeve, the screw 2 is continuously screwed, the screw 2 drives the pressing block 5 to lift until the pressing block 5 compresses the lower connecting piece B, and further the lower connecting piece B is compressed from the bottom direction, the problem of the bottom does not have the space and the lower union piece does not have the connection between upper union piece A and the lower union piece B under the screw hole occasion of seting up is solved.

Claims

1. Reverse fastening screw, its characterized in that: the screw rod is in threaded connection with the inner hole of the screw rod sleeve after penetrating through the inner hole of the screw rod sleeve, a pressing block is arranged below the bottom of the screw rod sleeve and connected to the lower rod end of the screw rod, the pressing block and the screw rod can rotate relatively, a limiting block is fixed on the bottom end face of the screw rod sleeve, the limiting block is used for circumferentially limiting the rotation of the pressing block, and the pressing block can synchronously rotate along with the screw rod when not in contact with the limiting block; the pressing block is at a rotation starting position, the whole periphery of the outer edge of the pressing block is positioned in an extension space surrounded by the excircle of the screw rod sleeve, and the local periphery of the outer edge of the pressing block can leave the extension space surrounded by the excircle of the screw rod sleeve at a rotation finishing position; the compact heap is eccentric circle and takes local breach, and local breach corresponds the stopper, and the excircle diameter of eccentric circle equals or is less than the telescopic excircle diameter of screw rod.