CN215805644U - Inner hexagonal countersunk flat head machine screw without chamfer - Google Patents

Abstract

The utility model discloses a chamfer-free inner hexagonal countersunk head machine screw, which comprises a screw rod and a screw cap, wherein the top of the screw rod is fixedly connected with the screw cap, the middle part of the screw rod is in threaded connection with the screw cap, the bottom of the screw rod is provided with a cavity, two limiting rods are respectively arranged at two sides of the cavity, the surfaces of the four limiting rods are respectively sleeved with a return spring, one end of each return spring is respectively and fixedly connected with two ends at two sides of the cavity, through the mutual matching of the limiting rod, the reset spring, the bending sheet, the limiting groove and the fixing rod, firstly, the nut is installed, the fixing rod is inserted from the bottom of the cavity, the end part of the fixing rod extrudes the bending sheet to ensure that one end of the limiting rods at two sides passes through the limiting groove to extend to the outside of the screw rod, when the nut begins to slip downwards under the action of vibration, the limiting rod can prevent the nut from continuously separating from the screw rod downwards, and the stability of the mounting structure is guaranteed.

Description

Inner hexagonal countersunk flat head machine screw without chamfer

Technical Field

The utility model relates to the technical field of screws, in particular to a chamfer-free inner hexagonal countersunk flat head machine screw.

Background

The countersunk head machine screw belongs to one type of screw, the head part is always arranged to be flat-headed, countersunk head or semi-countersunk head, the countersunk head screw can be called as flat-headed screw, countersunk head screw, semi-countersunk head screw or semi-countersunk head screw, and the common countersunk head screw is mostly suitable for power equipment, electronic machinery, mechanical equipment and the like.

When current screw installation is fastened on electronic machine, because electronic machine can produce certain vibrations under the state of work, the not hard up condition can appear in the screw under frequent vibrations, serious can directly loosen for the screw loses fastening, and mounting structure has certain danger.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a chamfer-free socket head countersunk head machine screw, which solves the problems that the conventional screw provided by the background art generates certain vibration under the working state of an electronic machine, the screw is difficult to loosen under frequent vibration, the screw is seriously loosened directly, the fastening effect of the screw is lost, and the mounting structure has certain danger.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a no inner hexagonal countersunk flat head machine screw of chamfer, includes screw rod and nut, the top fixedly connected with nut of screw rod, the middle part threaded connection of screw rod has the nut, the cavity has been seted up to the bottom of screw rod, the both sides of cavity all are equipped with two gag lever posts, four the surface of gag lever post all is equipped with reset spring, four reset spring's one end respectively with the both ends fixed connection of cavity both sides, the bottom interlude of cavity is provided with the dead lever.

As a preferable technical scheme of the utility model, one end of each of the four limiting rods is provided with a bending piece.

As a preferable technical scheme of the utility model, one end of the fixed rod is set to be a cone.

As a preferred technical scheme of the utility model, two limiting grooves are respectively formed in two sides of the screw rod, and the four limiting grooves are respectively arranged corresponding to the four limiting rods.

As a preferred technical scheme of the utility model, the bottom of the screw cap is fixedly connected with a plurality of evenly distributed anti-slip strips which are arranged in a circular shape.

As a preferable technical scheme of the utility model, the top of the nut is provided with a hexagonal groove.

As a preferable technical scheme of the utility model, the surface of the screw and the surface of the screw cap are both sprayed with anti-corrosion paint.

As a preferable technical scheme of the utility model, the surfaces of the four limiting rods are respectively connected with the four limiting grooves in a sliding manner.

Compared with the prior art, the utility model has the beneficial effects that: through the gag lever post, reset spring, the piece of buckling, mutually supporting of spacing groove and dead lever, at first install the nut, later insert the dead lever from the cavity bottom, make the tip extrusion of dead lever buckle the piece, and then make the one end of both sides gag lever post pass the spacing groove and extend to the screw rod outside, start the slippage downwards under the effect of vibrations as the nut, the gag lever post can prevent that the nut from continuously breaking away from the screw rod downwards, thereby the slippage of screw has been prevented, mounting structure's stability has been guaranteed.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic cross-sectional view of the present invention;

fig. 3 is a schematic bottom view of the present invention.

In the figure: 1. a screw; 2. a nut; 3. a limiting rod; 4. a nut; 5. a cavity; 6. a return spring; 7. fixing the rod; 8. bending the sheet; 9. a limiting groove; 10. anti-slip strips; 11. a hexagonal groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, the utility model provides a chamfer-free hexagon socket countersunk head machine screw, which comprises a screw rod 1 and a nut 2, wherein the nut 2 is fixedly connected to the top of the screw rod 1, the nut 4 is in threaded connection with the middle of the screw rod 1, and the screw rod 1 is in threaded connection with the nut 4 so as to fasten a corresponding object, a cavity 5 is formed in the bottom of the screw rod 1, two limiting rods 3 are arranged on two sides of the cavity 5, return springs 6 are sleeved on the surfaces of the four limiting rods 3, when the limiting rods 3 are not affected by external force, the return springs 6 drive the limiting rods 3 to return to the inside of the cavity 5, one ends of the four return springs 6 are respectively and fixedly connected with two ends of two sides of the cavity 5, and a fixing rod 7 is arranged at the bottom of the cavity 5 in an inserting manner.

Preferably, the one end of four gag lever posts 3 all is equipped with the piece 8 of buckling, conveniently inserts the one end of dead lever 7 between two gag lever posts 3.

Preferably, one end of the fixing rod 7 is set to be a cone, so that the two limiting rods 3 can be easily driven to move towards two sides along with the insertion of the fixing rod 7.

Preferably, two limiting grooves 9 have all been seted up to screw 1's both sides, and four limiting grooves 9 correspond the setting with four gag lever posts 3 respectively for gag lever post 3 can pass the gag lever post 9 and extend to screw 1 external.

Preferably, the bottom fixedly connected with of nut 2 has a plurality of evenly distributed's antislip strip 10, and a plurality of antislip strips 10 are circular setting, strengthens the frictional force of nut 2 and contact surface, prevents that screw 1 from rotating.

Preferably, hexagonal groove 11 has been seted up at the top of nut 2 for use with corresponding nail puller cooperation, the person of facilitating the use takes off the screw, has improved work efficiency.

Preferably, the surface of the screw rod 1 and the surface of the screw cap 2 are both sprayed with anti-corrosion paint, so that the overall anti-corrosion performance is enhanced.

Preferably, the surfaces of the four limiting rods 3 are respectively connected with the four limiting grooves 9 in a sliding manner, so that the stability of the limiting rods 3 moving outwards is guaranteed.

When the screw is used in detail, the screw 1 is assembled, the nut 4 is screwed on the bottom of the screw 1, so that the assembled electronic machine is fastened, the fixing rod 7 is inserted into the bottom of the cavity 5 after the assembly is completed, the cone at the end part of the fixing rod 7 extrudes the bending piece 8, so that the two limiting rods 3 are separated, the limiting rods 3 gradually penetrate through the limiting grooves 9 along with the gradual penetration of the fixing rod 7 and extend to the outside of the screw 1, when the electronic machine vibrates in a working state, the anti-slip strip 10 can enhance the friction force between the nut 2 and a contact surface and prevent the screw 1 from rotating, when the vibration force is increased, the screw 1 rotates to drive the nut 4 to slip downwards, when the nut 4 moves downwards to a certain degree, the limiting rods 3 can prevent the nut 4 from moving downwards continuously, so that the assembly stability is enhanced, and meanwhile, the service life of the whole is effectively prolonged by the anti-corrosion paint sprayed on the surface of the screw 1 and the surface of the screw, the whole structure is simple, has certain practicability, and is suitable for social popularization and use.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the utility model can be made, and equivalents and modifications of some features of the utility model can be made without departing from the spirit and scope of the utility model.

Claims (8)

1. The utility model provides a no interior hexagonal countersunk flat machine screw of chamfer, includes screw rod (1) and nut (2), its characterized in that: the top fixedly connected with nut (2) of screw rod (1), the middle part threaded connection of screw rod (1) has nut (4), cavity (5) have been seted up to the bottom of screw rod (1), the both sides of cavity (5) all are equipped with two gag lever post (3), four the surface of gag lever post (3) all is overlapped and is equipped with reset spring (6), four the one end of reset spring (6) respectively with the both ends fixed connection at cavity (5) both sides, the bottom of cavity (5) alternates and is provided with dead lever (7).

2. The non-chamfered allen countersunk head machine screw as claimed in claim 1, wherein: and one end of each of the four limiting rods (3) is provided with a bending piece (8).

3. The non-chamfered allen countersunk head machine screw as claimed in claim 1, wherein: one end of the fixing rod (7) is set to be a cone.

4. The non-chamfered allen countersunk head machine screw as claimed in claim 1, wherein: two limiting grooves (9) are formed in the two sides of the screw (1), and the four limiting grooves (9) are respectively arranged corresponding to the four limiting rods (3).

5. The non-chamfered allen countersunk head machine screw as claimed in claim 1, wherein: the bottom fixedly connected with of nut (2) a plurality of evenly distributed's antislip strip (10), and a plurality of antislip strip (10) are circular setting.

6. The non-chamfered allen countersunk head machine screw as claimed in claim 1, wherein: the top of the nut (2) is provided with a hexagonal groove (11).

7. The non-chamfered allen countersunk head machine screw as claimed in claim 1, wherein: and the surface of the screw rod (1) and the surface of the screw cap (2) are both sprayed with anticorrosive paint.

8. The non-chamfered allen countersunk head machine screw as claimed in claim 4, wherein: the surfaces of the four limiting rods (3) are respectively connected with the four limiting grooves (9) in a sliding manner.

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