CN212775109U

CN212775109U - Eccentric screw

Info

Publication number: CN212775109U
Application number: CN202021539540.4U
Authority: CN
Inventors: 邓冰
Original assignee: Jinyi Screw Shanghai Co ltd
Current assignee: Jinyi Screw Shanghai Co ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2021-03-23
Anticipated expiration: 2030-07-29

Abstract

The utility model relates to an eccentric screw, which comprises an end head and a screw rod, wherein the end head and the screw rod are integrally formed, the end head is in a cuboid shape, a first round angle is arranged between the adjacent side surfaces of the end head parallel to the axis of the screw rod, and a first long side surface of the end head parallel to the axis of the screw rod is concavely formed into a first arc surface; through setting up the cuboid form and having the end of sunken arc surface one, make it be heterotypic eccentric, this end structure only can be twisted under rather than supporting specialized tool effect, thereby make the utility model discloses have good theftproof effect.

Description

Eccentric screw

Technical Field

The utility model belongs to the technical field of bolt structure's technique and specifically relates to an eccentric screw is related to.

Background

The screw is a tool for fastening the parts of the object step by utilizing the physics and mathematical principles of the inclined circular rotation and friction of the object.

In the existing mechanical field, the end of a commonly used screw generally adopts a hexagonal head or a hexagon socket head, and although the commonly used screw is convenient to use, the screw is easy to detach, so that articles are stolen, because the screw end with the edge surface is very convenient to detach, and a standard wrench matched with the screw end can be freely bought in the market.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an eccentric screw, it has good theftproof effect to the not enough of prior art existence.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the utility model provides an eccentric screw, includes end and screw rod, wherein end and screw rod integrated into one piece, the end is the cuboid form, be equipped with fillet one between the adjacent side of the end that is on a parallel with the screw rod axis, a long side sunken shaping that is on a parallel with the screw rod axis of end is arc surface one.

By adopting the technical scheme, the cuboid end is a special-shaped body and is provided with the first round angle, a conventional wrench is difficult to twist, a special tool is required to unscrew the screw, and a certain anti-theft effect is achieved; one long side surface of the end head is provided with a first arc surface, even if the end head is locally sunken, the end head and the screw rod are eccentric, and therefore even if clamping tools such as a vice are adopted to clamp the end head, the screw rod is difficult to rotate due to the eccentric structure; meanwhile, the first arc surface is positioned on one long side surface of the end head, so that the processing is convenient to realize, and the first arc surface is an arc surface, so that the clamping tool is in point contact with the arc surface, and the clamping stability of the clamping tool to the end head is greatly reduced, namely the clamping tool is easy to slide when clamping; if the thief abandons the long side surface of the clamp end and selects the wide side surface (the wide side surface parallel to the axis of the screw rod) of the clamp end, the distance between the two clamp surfaces of the clamp tool needs to be correspondingly increased due to the larger distance between the two opposite wide side surfaces, so that an included angle is formed between the clamp surface and the wide side surface of the clamp tool, the contact area between the clamp surface and the wide side surface of the clamp tool is smaller, and the clamp stability is low and the clamp is easy to slide when clamping if the thief clamps the wide side surface of the clamp end; in conclusion, the arrangement greatly increases the theft difficulty of a thief, so that the anti-theft device has a good anti-theft effect.

The present invention may be further configured in a preferred embodiment as: and a first inclined plane is arranged at the junction between the long side surface of the end head opposite to the first arc surface and the side surface of the end head far away from the screw rod.

By adopting the technical scheme, the first inclined plane is arranged, so that the clamping tool of a thief loses the acting point, namely force is difficult to apply, and the anti-theft effect is further improved.

The present invention may be further configured in a preferred embodiment as: and a second inclined plane is arranged at the junction between the wide side surface of the end head parallel to the axis of the screw and the side surface of the end head far away from the screw.

By adopting the technical scheme, the arrangement of the second inclined plane enables the clamping tool of a thief to lose the acting point, namely to be difficult to apply force, thereby further improving the anti-theft effect.

The present invention may be further configured in a preferred embodiment as: an included angle between the first inclined plane and the axis of the screw is larger than 45 degrees; and the included angle between the second inclined plane and the axis of the screw is greater than 45 degrees.

By adopting the technical scheme, when the included angle between the first inclined plane and the axis of the screw rod is smaller than 45 degrees, the clamping force applied by the clamping tool of a thief to the second inclined plane is divided into a plurality of component forces, wherein the component force parallel to the first inclined plane is larger than the component force vertical to the first inclined plane, namely the clamping tool is easy to slide on the first inclined plane, so that the stealing difficulty is increased, and the anti-theft effect is improved; analysis of bevel two is as above.

The present invention may be further configured in a preferred embodiment as: the surface roughness of the first inclined plane and the surface roughness of the second inclined plane are both smaller than 12.5 mu m.

By adopting the technical scheme, the friction between the clamp face of the clamp tool and the first inclined plane and the friction between the clamp face of the clamp tool and the second inclined plane can be reduced, so that the clamp tool is difficult to clamp the end, the theft difficulty is increased, and the anti-theft effect is improved.

The present invention may be further configured in a preferred embodiment as: and a second fillet is arranged at the junction between the first inclined plane and the second inclined plane.

By adopting the technical scheme, the edges and corners of the end head are reduced so as to ensure the anti-theft effect.

The present invention may be further configured in a preferred embodiment as: the first inclined plane is provided with a step groove, the groove wall of the first step groove, which is opposite to the first arc surface, is formed into a second arc surface in a concave mode, the second arc surface is consistent with the curvature radius of the first arc surface, and the curvature center of the second arc surface is symmetrical to the curvature center of the first arc surface along the axis of the screw rod.

Adopt above-mentioned technical scheme, through setting up the arc surface two with the first symmetry setting of arc surface to be applicable to the appurtenance, this specialized tool's one end only need the machine-shaping have two respectively correspond the heterotypic lug of arc surface one and two shapes of arc surface can, reduce specialized tool's processing cost, through heterotypic lug respectively with arc surface one and two cooperations of arc surface, at this specialized tool of rotating, can realize screwing or the soon sending of eccentric screw.

The present invention may be further configured in a preferred embodiment as: the first arc surface and the second arc surface are both covered with wear-resistant layers.

By adopting the technical scheme, the violent damage of the first arc surface and the second arc surface by a thief is reduced, so that the eccentric screw can be screwed by a special tool.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the end head which is cuboid and provided with the first concave arc surface is eccentric in a special shape, and the end head structure can be screwed only under the action of a special tool matched with the end head structure, so that the anti-theft device has a good anti-theft effect;

2. the special tool is matched with the first arc surface and the second arc surface respectively through the special-shaped convex blocks, and the eccentric screw can be screwed or screwed by rotating the special tool.

Drawings

FIG. 1 is a schematic view of the overall structure of embodiment 1;

FIG. 2 is a lower view of the overall structure of embodiment 1;

FIG. 3 is a schematic view showing the fitting of the special tool and the head of example 1;

FIG. 4 is a schematic view of the whole structure of embodiment 2;

FIG. 5 is a schematic view from another perspective of the overall structure of embodiment 2;

fig. 6 is a schematic view of the engagement of the tool with the tip according to example 2.

In the figure, 1, end; 2. a screw; 3. a rod portion; 11. a first arc surface; 12. a first round corner; 13. a first inclined plane; 14. a second inclined plane; 15. a second round corner; 16. a step groove; 17. a second arc surface; 31. a special-shaped groove; 32. and (3) a special-shaped bump.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example 1: as shown in fig. 1, for the utility model discloses an eccentric screw, including end 1 and screw rod 2, wherein end 1 and screw rod 2 integrated into one piece.

As shown in fig. 1, the end head 1 is rectangular, a round corner first 12 is arranged between adjacent side surfaces of the end head 1 parallel to the axis of the screw rod 2, and a long side surface of the end head 1 parallel to the axis of the screw rod 2 is concavely formed into an arc surface first 11, that is, when the end head 1 is processed, a long side surface of the end head 1 is concavely formed, and the processing can be performed in the forms of turning, milling, one-time forging and forming, and the like, so that eccentricity is formed between the end head 1 and the screw rod 2 (see fig. 2).

For reference, as shown in fig. 3, the special tool for matching the eccentric screw includes a rod portion 3, wherein an end of the rod portion 3 is provided with a special-shaped groove 31 adapted to the shape of the end head 1; when the eccentric screw is used, the special-shaped groove 31 is matched with the end head 1, and then the rod part 3 is twisted to finish screwing or screwing of the eccentric screw.

The implementation principle of the embodiment is as follows: the rectangular end 1 is a special-shaped body, a conventional wrench is difficult to twist, a special tool is required to unscrew the screw, and a certain anti-theft effect is achieved; and one long side of the end 1 has a circular arc surface 11, even if the end 1 is locally sunken, the eccentricity is formed between the end 1 and the screw rod 2, therefore, even if a clamping tool such as a vice is adopted to clamp the end 1, the screw rod 2 is difficult to rotate due to the eccentric structure; meanwhile, the first arc surface 11 is located on one long side face of the end head 1, machining is facilitated, the first arc surface 11 is an arc surface, point contact is achieved between the clamping tool and the arc surface, the clamping stability of the clamping tool to the end head 1 is greatly reduced, namely the clamping tool is easy to slide when clamping is conducted, the arrangement greatly increases the stealing difficulty of a thief, and a good anti-theft effect is achieved.

Example 2: on the basis of the embodiment 1, as shown in fig. 4 and 5, a first inclined surface 13 is additionally arranged at the junction between the long side surface of the end head 1 opposite to the first arc surface 11 and the side surface of the end head 1 far away from the screw rod 2, and the included angle between the first inclined surface 13 and the axis of the screw rod 2 is greater than 45 degrees.

A second inclined plane 14 is arranged at the junction between the wide side surface of the end head 1 parallel to the axis of the screw rod 2 and the side surface of the end head 1 far away from the screw rod 2, and the included angle between the second inclined plane 14 and the axis of the screw rod 2 is larger than 45 degrees; the surface roughness of the first inclined plane 13 and the surface roughness of the second inclined plane 14 are both smaller than 12.5 microns, and a second fillet 15 is arranged at the junction between the first inclined plane 13 and the second inclined plane 14.

The first inclined plane 13 and the second inclined plane 14 are arranged, so that the clamping tool of a thief loses the force application point, namely the force is difficult to apply, and the anti-theft effect is further improved; when the included angle between the inclined plane I13 and the axis of the screw rod 2 is smaller than 45 degrees, the clamping force applied to the inclined plane II 14 by the clamping tool of a thief is divided into a plurality of component forces, wherein the component force parallel to the inclined plane I13 is larger than the component force vertical to the inclined plane I13, namely the clamping tool is easy to slide on the inclined plane I13, so that the stealing difficulty is increased, and the anti-theft effect is improved; bevel two 14 was analyzed as above.

As shown in fig. 4 and 5, the first inclined surface 13 is provided with a step groove 16, the step groove 16 is recessed relative to the groove wall of the first arc surface 11 to form a second arc surface 17, and the first arc surface 11 and the second arc surface 17 are both covered with a wear-resistant layer; the curvature radius of the second arc surface 17 is consistent with that of the first arc surface 11, and the curvature center of the second arc surface 17 and that of the first arc surface 11 are symmetrically arranged along the axis of the screw rod 2.

The embodiment of the invention provides a special tool matched with the eccentric screw, as shown in fig. 6, the special tool comprises a rod part 3, two special-shaped convex blocks 32 which are respectively matched with a first arc surface 11 and a second arc surface 17 are protruded at the end part of the rod part 3; the special-shaped convex block 32 is respectively matched with the first arc surface 11 and the second arc surface 17, and the special tool is rotated, so that the eccentric screw can be screwed or screwed; and because the first arc surface 11 and the second arc surface 17 are identical and symmetrical in shape, the special tool only needs to be processed and formed with two special-shaped convex blocks 32 which are identical and symmetrical in shape, and the processing cost of the special tool is greatly reduced.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. An eccentric screw, characterized by: including end (1) and screw rod (2), wherein end (1) and screw rod (2) integrated into one piece, end (1) are the cuboid form, be equipped with fillet (12) between the adjacent side of end (1) parallel to screw rod (2) axis, the sunken shaping of a long side parallel to screw rod (2) axis of end (1) is arc surface (11).

2. The eccentric screw of claim 1, wherein: and a first inclined plane (13) is arranged at the junction between the long side surface of the end head (1) opposite to the first arc surface (11) and the side surface of the end head (1) far away from the screw rod (2).

3. The eccentric screw of claim 2, wherein: and a second inclined plane (14) is arranged at the junction between the wide side surface of the end head (1) parallel to the axis of the screw rod (2) and the side surface of the end head (1) far away from the screw rod (2).

4. An eccentric screw according to claim 3, wherein: an included angle between the first inclined plane (13) and the axis of the screw rod (2) is larger than 45 degrees; the included angle between the second inclined plane (14) and the axis of the screw rod (2) is larger than 45 degrees.

5. An eccentric screw according to claim 3, wherein: the surface roughness of the first inclined plane (13) and the surface roughness of the second inclined plane (14) are both smaller than 12.5 mu m.

6. An eccentric screw according to claim 3, wherein: and a second fillet (15) is arranged at the junction between the first inclined plane (13) and the second inclined plane (14).

7. The eccentric screw of claim 2, wherein: step groove (16) have been seted up on inclined plane one (13), the sunken shaping of the cell wall of the relative arc surface one (11) of step groove (16) is arc surface two (17), arc surface two (17) with the curvature radius of arc surface one (11) is unanimous, just the curvature center of arc surface two (17) with the curvature center of arc surface one (11) is followed the axis symmetry of screw rod (2) sets up.

8. The eccentric screw of claim 7, wherein: the first arc surface (11) and the second arc surface (17) are both covered with wear-resistant layers.