CN200964987Y

CN200964987Y - Self-locking screw

Info

Publication number: CN200964987Y
Application number: CN 200620130204
Authority: CN
Inventors: 陈大为
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-10-25
Filing date: 2006-10-25
Publication date: 2007-10-24
Anticipated expiration: 2016-10-25

Abstract

The utility model discloses a self-locking screw which includes a screw body, one end of which is a screw head, a fixed bottom seat, a moveable locking ring and a spring; the fixed bottom seat and the moveable locking ring are sleeved with the screw body; the spring is arranged between the fixed bottom seat and the moveable locking ring; the internal side of the screw head is provided with a convex platform; the moveable locking ring is provided with a concave trough which is matched with the convex platform. By the engagement with teeth, the self-locking screw can bear high external forces and still keeps locking condition. By spring, the utility model can self-supplement the abrasion to the engaged teeth, and insures reliable locking after long-term operation. Without requirement of special tools, the utility model only requires the current ring wrench for operation. The lock is automatically open after the operation starts, and the lock is automatically locked after the operation is finished, without requirement of human intervention.

Description

Self-locking screw

Technical field

The utility model belongs to fastening piece, relates in particular to a kind of self-locking screw.

Background technique

Anti-skidding being meant of so-called screw prevents that screw is subjected to the loosening voluntarily rotation of external force effect after fastening.Existing screw is anti-skidding main by increasing the concavo-convex of screw surface of contact, increases the frictional force with surface of contact.This method the screw degree of tightness several times after because anti-skidding effect has just been lost in jog wearing and tearing.And anti-skidding mechanism is frictional force, the height vibration, heavily stressed, having can't reliable, slip-resistant under the situation that greasing substance exists.And can guarantee its reliability by latch, and inconvenient but latch uses, the degree of tightness inconvenience.

Summary of the invention

The purpose of this utility model provides a kind of anti-skidding reliable and make things convenient for the self-locking screw of degree of tightness.

For achieving the above object, the utility model adopts following technological scheme: a kind of self-locking screw, comprise the screw body, screw body one end is a screw terminal, it also comprises fixed base, movable lock ring and spring, and fixed base and movable lock ring all are sleeved on the screw body, and spring is contained between fixed base and the movable lock ring, there is boss the inboard of screw terminal, and the groove that matches with boss is arranged on the movable lock ring.

Fixed base and movable lock ring intermesh.

Described boss outer rim is circular arc.

Screw terminal is a regular polygon.

Adopt the self-locking screw of technique scheme, carry out interlock, can bear high external force effect and still keep locking by tooth.By spring, can be to tooth engaged compensate for wear voluntarily, guaranteeing still can secure ratcs after the long period of operation.Do not need special tool(s), only use existing ring wrench just can operate.Operation beginning auto-unlocking, automatic locking does not need human intervention behind the EO.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the structural representation of fixed base.

Fig. 3 is the structural representation of movable lock ring.

Fig. 4 is a screw main body structure schematic representation.

Fig. 5 is the A-A sectional drawing of Fig. 2.

Fig. 6 is the B-B sectional drawing of Fig. 3.

Fig. 7 is the C-C sectional drawing of Fig. 3.

Fig. 8 is the D-D sectional drawing of Fig. 4.

Embodiment

Self-locking screw as shown in Figure 1 comprises screw body , as shown in Figure 4, screw body one end is a screw terminal, and screw terminal is a regular hexagon, and it also comprises fixed base 4, movable lock ring 2 and spring 3, fixed base 4 all is sleeved on the screw body 1, as Fig. 2 with movable lock ring 2.Fig. 3, Fig. 5, shown in Figure 6, fixed base and movable lock ring can intermesh.Spring 3 is contained between fixed base 4 and the movable lock ring 2.As Fig. 4, shown in Figure 8, there is boss the inboard of screw terminal, and the boss outer rim is circular arc, as Fig. 3, shown in Figure 7, on the movable lock ring 2 groove that matches with boss is arranged.

The utility model in use, the screw body contacts with fixed base by movable surface of contact and to transmit screw stressed.Movable lock ring slides on the screw body, the interlock of sliding all the time of an end and fixed base, the other end under spring action with the boss interlock of screw body.

When needs are adjusted the degree of tightness of screw, use ring wrench, depress movable lock ring, movable lock ring separates with the screw body, and screw body free to rotate carries out degree of tightness.Degree of tightness finishes the back under the effect of spring, and movable lock ring resets, and interlock screw body is realized self-locking.

Claims

1, a kind of self-locking screw, comprise the screw body, screw body one end is a screw terminal, it is characterized in that: it also comprises fixed base, movable lock ring and spring, fixed base and movable lock ring all are sleeved on the screw body, spring is contained between fixed base and the movable lock ring, and there is boss the inboard of screw terminal, and the groove that matches with boss is arranged on the movable lock ring.

2, self-locking screw as claimed in claim 1 is characterized in that: fixed base and movable lock ring intermesh.

3, self-locking screw as claimed in claim 1 is characterized in that: described boss outer rim is circular arc.

4, self-locking screw as claimed in claim 1 is characterized in that: screw terminal is a regular polygon.