JPH0126531Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an emergency locking type retractor for seat belts, and has a new structure that operates reliably, has a simple structure, is easy to assemble, and can be provided at a low cost. The purpose is to provide something.

The present invention will be explained below with reference to the drawings. Reference numeral 1 denotes a retractor frame, which is composed of a bottom plate 2 and side plates 3 provided opposite to each other on both sides of the bottom plate 2. The bottom plate 2 has mounting bolt holes 4. However, bearing holes 5 are formed in each of the side plates 3. Reference numeral 6 denotes a reel for winding the belt, and a shaft 7 is inserted through the center of the reel.A ratchet gear 9 having engagement teeth 8 on the outer periphery is fixed to both ends of the shaft 7 so as to rotate together with the reel. Both ends of the sleeve 10 are fixed to. Shaft 7
Both ends of the shaft 7 are rotatably supported in the bearing hole 5 via a bush 11, and a spring means (not shown) is provided at one end of the shaft 7 to constantly apply a rotational force to the shaft for winding the belt. It is provided.

Reference numeral 12 denotes a pawl, which is swingably supported in a support hole 13 formed in the side plate 3 of the frame 1, and when the pawl swings, it engages and disengages from the engagement teeth 8 of the ratchet gear 9. It is becoming possible to do this. The end portion 14 of the pawl 12 is connected to the side plate 3
A swinging member 15 is fitted into this terminal portion, and a bending piece 16 is formed at the upper end of the swinging member 15 so as to extend outward. Thus, the pawl 12 is always biased in a direction out of engagement with the ratchet gear 9 by the elasticity of the wire spring 17.

Reference numeral 18 denotes an operating member fitted into a protruding portion 19 protruding from the side plate 3 of the shaft 7 so as to be rotatable with respect to the shaft 7, and has two arms 21 and 22 protruding from the base 20. , is formed in a generally V-shape as a whole. A window 23 is bored at the tip of one arm 21, and the bent piece 16 of the swinging member 15 is loosely fitted into the window 23.

Reference numeral 24 denotes a rotary plate, which has a deep dish-like shape with a concave central portion, and is fixed at its center so as to rotate integrally with the shaft 7. Further, the peripheral edge portion 25 of the rotary plate 24 is formed into a planar shape.

Reference numeral 26 denotes a driven ring, which is fitted into the peripheral edge 25 of the rotary plate 24 so as to be rotatable relative to the rotary plate 24. The side plate 2 facing the peripheral edge 25
7, and a short cylindrical part 28 that fits on the outer periphery of the peripheral edge part 25, and the short cylindrical part 28 has ratchet teeth 29 on the outer periphery.
Further, a presser piece 30 is formed on the inner periphery of the tip of the short cylindrical portion 28 and engages with the peripheral edge 25 of the rotary plate 24.
is installed protrudingly. Further, a ring-shaped leaf spring 31 is attached to the side surface of the side plate portion 27 of the driven ring 26 that faces the peripheral edge portion 25 of the rotating plate 24 . This ring-shaped plate spring 31 has pressure contact pieces 32 cut and raised at a plurality of locations, and the pressure contact pieces 32 are brought into elastic contact with the peripheral edge 25 of the rotary plate 24 and press the rotary plate 24 against the presser piece 30. There is.

33 is an acceleration sensing device, and a pendulum 35 as an acceleration sensing member is placed in a box 34 fixed to the side plate 3. Furthermore, a swing lever 36 is mounted on the top of the pendulum 35 and is swingably attached to the box body 34. Further, the operating member 1
A hook 37 is swingably attached to the arm 22 of No. 8, and its tip is connected to the driven ring 26.
The ratchet teeth 29 can be engaged and disengaged from each other.

38 is a cover that covers this emergency lock mechanism.

Next, the operation of this emergency lock type retractor will be explained. First, in a normal state, the pendulum 35 is in a normal position as shown in the drawing, and the hook 37 is in a non-engaging position with respect to the ratchet teeth 29 of the driven ring 26. Also, the pawl 12 is also wire spring 1.
Due to the elasticity of 7, the ratchet gear 9 is held in a non-engaging position. Therefore, the shaft 7 can freely rotate together with the ratchet gear 9 and the rotary plate 24, and can freely pull out and wind the belt. Further, the driven ring 26 also rotates together with the rotating plate 24.

Therefore, when a large acceleration is applied to the automobile due to an accident or sudden braking, the pendulum 35 swings upon sensing this acceleration and flips up the swing lever 36. As a result, the swinging lever 36 further swings the hook 37, and the tip of the hook 37 comes to a position where it engages with the ratchet teeth 29 of the driven ring 36.

When the belt is pulled out in this state, the shaft 7 rotates counterclockwise and the rotating plate 24 also rotates in the same direction. Furthermore, the driven ring 26 is a ring-shaped leaf spring 31.
Since it is frictionally engaged with the rotating plate 24 by
This also rotates as the rotating plate 24 rotates, and the ratchet teeth 29 engage the hooks 37. When the driven ring 26 further rotates, the operating member 18 is rotated counterclockwise via the hook 37, the arm 21 is rotated to the right in FIG. The swinging member 15 is then pivoted clockwise, and the pawl 12 is further pivoted clockwise to a position where it can engage with the ratchet teeth 8 of the ratchet gear 9.

In this state, the pawl 12 is still at the ratchet tooth 8.
Because the shaft 7 and rotating plate 2 are not engaged,
4 continues to rotate, but the operating member 1
8 is no longer able to rotate via the pawl 12 and the swinging member 15, and furthermore, the rotation of the driven ring 26 is stopped via the hook 37. At this time,
Since the driven ring 26 and the rotary plate 24 are frictionally engaged by the ring-shaped leaf spring 31, mutual sliding occurs, and the rotary plate 24 can continue to rotate. Therefore, if the ratchet tooth 8 of the ratchet gear 9 engages with the pawl 12, the further shaft 7
The rotation of the retractor is stopped by the pawl 12, and the retractor is reliably locked.

In the present invention, the pawl 12 is not directly swung by the swiveling of the acceleration sensing member 35, but a light swiveling lever 36 and a hook 37 are swung, so the operation is quick and reliable. It is. Moreover, the rotating plate 24 and the driven ring 26
Since they are in frictional engagement, there is no need to synchronize the ratchet teeth 29 of the driven ring 26 and the ratchet teeth 8 of the ratchet gear 9, and the mechanism will not be damaged even if their operations deviate.

Furthermore, since the frictional engagement between the rotary plate 24 and the driven ring 26 is performed by the ring-shaped leaf spring 31, the spring is durable and loses its springiness in a short period of time unlike conventional wire springs. There is no uncertainty in operation, and it can operate safely for a long period of time. Furthermore, in the present invention, it is only necessary to fit the operating member 18 and the rotary plate 24 to the shaft in sequence, and then fit the driven ring 26 to which the ring-shaped leaf spring 31 is attached to the rotary plate 24, so that the structure is simplified. It is simple and extremely easy to assemble, and can be provided at low cost.

Note that the ring-shaped leaf spring 31 in the present invention is
In the previous embodiment, it is attached to the driven ring 26, but this is attached to the peripheral edge portion 25 of the rotary plate 24, and the pressure contact piece 32 is attached to the side plate portion 27 of the driven ring 26.
It may be made to be in pressure contact with.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
FIG. 1 is a sectional view taken from FIG. 2, and FIG. 2 is a partially cutaway right side view. DESCRIPTION OF SYMBOLS 1... Frame, 7... Shaft, 9... Ratchet gear, 12... Pawl, 15... Swinging member, 17... Spring means (wire spring), 18... Operating member, 24... Rotating plate, 25 ...Periphery, 26...
... Driven ring, 27 ... Side plate portion, 29 ... Ratchet tooth, 31 ... Ring-shaped leaf spring, 32 ... Pressure contact piece, 35 ... Acceleration sensing member (pendulum), 36 ...
...Swinging lever, 37...Hook.

Claims (1)

[Scope of utility model registration request] A ratchet gear 9 is fixed to rotate integrally with the shaft 7 of the retractor, and a ratchet gear 9 is swingably supported by the frame 1 of the retractor and can be engaged with and disengaged from the ratchet gear. an operating member 18 supported at one end of the shaft so as to be rotatable relative to the shaft; and an operating member 18 supported at one end of the shaft so as to rotate integrally with the shaft. A fixed rotary plate 24, a side plate portion 27 that is rotatably fitted to the peripheral edge 25 of the rotary plate and faces one side of the rotary plate, and ratchet teeth 29 formed on the outer periphery of the side plate portion 27. and the other of the rotary plate or the side plate portion, which is fixed to either one of the facing surfaces of the side plate portion of the driven ring and the rotary plate, and is cut and raised laterally at a plurality of locations. a ring-shaped plate spring 31 formed with a press-contact piece 32 that comes into elastic contact with the pawl; a swinging member 15 that is integrally fixed to the pawl and a portion of which is locked to the operating member; and a swinging member 15 that is swingable to the operating member. a hook 37 which is supported by the frame and whose tip can engage with the ratchet teeth of the driven ring; and an acceleration sensing member 3 which is swingably supported with respect to the frame.
An emergency lock type retractor comprising a swing lever 36 which is caused to swing when the hook 5 swings, and swings the hook in a direction to engage the ratchet teeth of the driven ring.