CN201304959Y

CN201304959Y - Self-locking retractor with anti-self-tightening function

Info

Publication number: CN201304959Y
Application number: CNU2008201605054U
Authority: CN
Inventors: 吴兴强; 周玉娟
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-10-09
Filing date: 2008-10-09
Publication date: 2009-09-09
Anticipated expiration: 2018-10-09

Abstract

The utility model relates to a self-locking retractor with anti-self-tightening function for an auto, the self-locking retractor comprises a framework with two vertical walls, a roll tape, a roll tape shaft, a clutch disc, a coil spring and a baffle plate which can rotate by a certain angle, fluted discs are arranged at the two ends of the roll tape shaft, locking teeth on the fluted discs can be separated from or meshed with the baffle plate, a notch is formed at the outer edge of the clutch disc, small protrudent poles which are extended into arched grooves of the vertical walls of the framework are arranged on the surface of the disc; an extension part which is extended to the outside of the circumference is arranged on one side of the notch of the clutch disc, and a locking surface is formed at the side of the notch; the radius of the clutch disc is larger than the maximum radius of the fluted discs of the roll tape shaft, the radian of the arched grooves is larger than the included angle between the adjacent two locking teeth on the fluted discs of the roll tape shaft; and the radian of the clutch disc is larger than the radian angle between the adjacent two locking teeth on the fluted discs of the roll tape shaft. The retractor can effectively solve the problem that the more the roll tape is locked, the tighter the roll tape is, and the extension length of the roll tape can be positioned at a more comfortable degree.

Description

Self-locking type coiler with function of self-tightening prevention

Technical field

The utility model relates to a kind of self-locking type coiler of car belt, particularly has the self-locking type coiler of function of self-tightening prevention.

Background technology

For guaranteeing driver and conductor's safety by bus, automobile is equipped with the safety strap self-locking type coiler.Have one in this taking-up device by spring-loaded rotatable take-up spool, take-up spool is installed on the support, on the axle winding is housed.When winding is drawn out or regains, when take-up spool rotates.A long baffle plate is housed on the support, and its installation site just can make the ratchet locking mesh of itself and take-up spool two end-toothed discs.In the process that winding is drawn out, baffle plate and ratchet are in separated position, after winding is drawn out to desired location and regains slightly, plate washer immediately with the ratchet locking mesh.So, in case after winding is drawn out to desired location and unclamps gently, taking-up device will automatically lock immediately, stops winding to continue to be drawn out.

But there is such problem in existing self-locking type coiler: if outwards pulling out of replacing repeatedly of winding and inwardly shrinking, and each amount of movement is all smaller, then can receive tighter and tighter.When the seatbelt wearing person adjusts reasons such as sitting posture or vehicle jolt, the comparatively safe band of human body always has certain body movement, this moment just may occur this self-tightening phenomenon.And human body comprises that wearing clothing is a non-rigid body, and volume can constantly change owing to reasons such as breathing are worn partly, and when volume reduces, winding will produce certain backrush because of the wind spring effect, and will be locked then; When increase in volume or human body reach, stop winding to be drawn out because of take-up spool is locked.Such phenomenon can be drawn tighter and tighter and limit the activity of wearing part fully for being adorned oneself with, and is very uncomfortable.

Summary of the invention

The purpose of this utility model provides a kind of self-locking type coiler with function of self-tightening prevention, solves existing self-locking type coiler winding and blocks tighter and tighter this problem.

The utility model self-locking type coiler comprises the baffle plate of a framework with two walls, winding, take-up spool, clutch discs, wind spring and rotatable certain angle, the take-up spool two ends are provided with fluted disc, locking teeth on the fluted disc can break away from or engagement with baffle plate, the outer rim of clutch discs is provided with a recess, and card is provided with the small projecting bar in the arcuate slots that stretches into the framework wall; One side of said clutch discs recess is provided with the extension that extends outside circumference, and forms a lock face in this side of recess; The radius of clutch discs is greater than the maximum radius of take-up spool fluted disc, and the radian of arcuate slots is greater than the angle between adjacent two locking teeths of said take-up spool fluted disc; The radian of clutch discs (promptly removing the recess position) is greater than the radian between the adjacent two locking teeth of fixed reel, and the arcuate slots radian of said framework wall is 90 ° to 300 °.

When take-up spool when winding pull-out direction (anticlockwise direction) rotates, clutch discs is together rotated with winding, arrives at the terminal of arcuate slots until small projecting bar, clutch discs is withstood baffle plate, stops baffle plate and take-up spool fluted disc locking teeth to mesh; When take-up spool from the maximum pull-out location of winding when backrush rotated position (clockwise direction), clutch discs is rotated thereupon, to the top of small projecting bar near arcuate slots, be drawn out to winding clutch discs again and get back to baffle plate and fall into recess this moment, baffle plate and locking teeth mesh and with the fluted disc locking, the locking phenomenon of receiving tighter and tighter can not occur.

But this taking-up device actv. solves the phenomenon that winding blocks tighter and tighter, can make the length of pulling out of winding be positioned at more comfortable degree, makes the wearer have certain activity.

Description of drawings

Fig. 1 is the take-up spool three-dimensional structure diagram.

Fig. 2 is the partial sectional perspective view of this function of self-tightening prevention self-locking type coiler.

Fig. 3 is the frame facet view among Fig. 2.

Fig. 4 is the fluted disc constructional drawing of take-up spool.

Fig. 5 is the front view of clutch discs.

Fig. 6 is the left view of Fig. 5.

The specific embodiment

This self-locking type coiler structure such as Fig. 2 are equipped with a rotating take-up spool 34 and rotating baffle plate 36 on the

wall

31 and 32 of framework 33, and respectively there is a fluted disc 35 (as Fig. 1) that a plurality of locking teeths are arranged at take-up spool 34 two ends; Wind spring 48 is installed on the wall 31, and it makes take-up spool be subjected to the turning force of a rolling direction (being clockwise direction); Clutch discs 38 is installed between fluted disc 35 and the spring 48, and spring 48 is pressed to clutch discs 35 fluted disc 35 of take-up spool and played rotation with one; Among Fig. 2, extend maximum pull-out location and when withdrawing gently, baffle plate 36 is rotated to take-up spool fluted disc 35 directions by the effect of torsion spring 37 when winding is pulled outwardly, cause a certain locking teeth engagement of itself and fluted disc, thereby restriction take-up spool anticlockwise motion is realized locking function.Fig. 3 represents, the inserting groove 36-1 of framework 33 walls, 32 arcuate slots 47 and baffle plate 36, and the small projecting bar 46 of clutch discs 38 stretches in this arcuate slots 47 among Fig. 2.

The structure of clutch discs 38 such as Fig. 5, the outer rim of clutch discs is provided with a recess 41, card is provided with small projecting bar 46, it stretches in the arcuate slots 47 of framework wall, when clutch discs 38 during, small projecting bar 46 slippage in arcuate slots 47, when small projecting bar 46 is run into any end of arcuate slots with take-up spool 34 rotation, clutch discs 38 is stop, and fluted disc 35 can rotate with respect to clutch discs; One side of said recess 41 is provided with the extension 42 that extends outside circumference, and the lock face 40 of formation and clutch discs axis normal; The radius 45 of clutch discs is greater than the maximum radius 54 as the take-up spool fluted disc 35 of Fig. 4, big radian between clutch discs recess 41 both sides is greater than the radian 53 between the adjacent two locking teeth of fixed reel, and radian 56 (see figure 3)s of wall arcuate slots 47 are 90 °～300 °.

This taking-up device 30 is connected firmly by framework 33 and automobile chassis frame.During beginning, winding is wrapped on the take-up spool fully, and thicker winding layer forces baffle plate 36 outwards to leave the locking teeth 51 of take-up spool 34, should outwards spur winding after, residue winding diameter can be more and more littler on the take-up spool, the winding meeting disengages with baffle plate.As Fig. 2, clutch discs 38 is with take-up spool 34 left-hand revolution together, small projecting bar 46 promptly prolongs to groove end 57 from the groove end 55 of arcuate slots 47, clutch discs 38 is promptly stopped the rotation, take-up spool continues rotation, and owing to the maximum radius 54 (Fig. 4) of radius 45 (Fig. 5) greater than fluted disc 35 locking teeth outer most edge, so extension 42 withstands baffle plate 36, make the locking teeth 51 of baffle plate 36 away from take-up spool, lock face 40 contacts with the edge 49 of baffle plate 36.Thereby prevent the winding chucking.In case being installed in the dead bolt of winding end regains gently with coupling snap close lock jail and winding, clutch discs 38 clockwise rotates with take-up spool, the extension 42 of clutch discs promptly leaves baffle plate 36, locked tooth locking when baffle plate passes through recess 41, thereby stop take-up spool further to rotate counterclockwise, promptly stop winding further outwards to be pulled out.Cause winding to fluff if the terminal tension force of winding diminishes, winding can be regained taking-up device.When seatbelt wearing person activity or vehicle jolt when causing wearing partial volume and reducing, this situation will appear.Cause that clutch discs 38 clockwise rotates when cw changes when the take-up spool winding roll film, make baffle plate 36 cross recess 41, thereby the baffle plate 36 and the locking teeth 51 of take-up spool 34 are separated.Winding is along with take-up spool and clockwise rotating of clutch discs and when constantly regaining, arc surface 44 outer rims of clutch discs 38 can contact with baffle plate 36, make small projecting bar 46 near groove end 55, if outwards pull out winding this moment, clutch discs will be reversed with take-up spool, fall into recess 41 again up to baffle plate 36, baffle plate locks take-up spool 34 with the locking teeth engagement again, after take-up spool was locked, winding no longer can be drawn out, but can the locking phenomenon of receiving tighter and tighter can not occur in certain distance.

The radian 56 of arcuate slots 47 can obtain optimum efficiency in 90 ° to 300 ° scopes the time.In the present embodiment, arcuate slots 47 radians are 210 °, and the radian 50 of Fig. 4 clutch discs except that notch portion 41 is 330 ° (notch portion 41 is 30 °), and the radian 53 among Fig. 5 between the adjacent locking teeth 51 is 60 °.

Claims

1. the self-locking type coiler that has function of self-tightening prevention, the baffle plate that comprises a framework, winding, take-up spool, clutch discs, wind spring and rotatable certain angle with two walls, the take-up spool two ends are provided with fluted disc, locking teeth on the fluted disc can break away from or engagement with baffle plate, the outer rim of clutch discs is provided with a recess, and card is provided with the small projecting bar in the arcuate slots that stretches into the framework wall; A side that it is characterized in that the clutch discs recess is provided with the extension that extends outside circumference, and forms a lock face in this side of recess; The radius of clutch discs is greater than the maximum radius of take-up spool fluted disc, and the radian of arcuate slots is greater than the angle between adjacent two locking teeths on the said take-up spool fluted disc; The radian of clutch discs is greater than the radian between the adjacent two locking teeth of fixed reel.

2. the self-locking type coiler with function of self-tightening prevention according to claim 1, the arcuate slots radian that it is characterized in that the framework wall are 90 ° to 300 °.