JPS596842Y2 - Emergency locking retractor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an emergency locking retractor for a safety belt for a vehicle such as an automobile, and more particularly to a vehicle body sensing type emergency locking retractor that locks the belt by sensing acceleration applied to the vehicle body.

Many emergency locking retractors have been invented, devised, and put into practice.

An important technical problem with these inner vehicle body sensing type tractors is so-called tooth skipping between the lock bar and the ratchet wheel.

This is because when the lock bar and ratchet try to engage in an emergency, the apex of the lock bar accidentally collides with the apex of the teeth of the ratchet, rebounds, and a large amount of belt length is pulled out further. This results in insufficient restraint for the occupants.

Conventionally, a so-called synchronous method has been the most typical method for solving this problem of tooth skipping.

This is provided with another pair of lock bar and ratchet (often made of resin), and this lock bar and ratchet are engaged in advance, and due to these engagements, the pull-out force of the reel drives the metal lock bar and the teeth of the ratchet are always engaged. The lock bar is configured so that it enters the teeth of the ratchet at a constant engagement angle and position.

Other conventional examples include those that use multiple ratchets, lock bars, and acceleration sensing members to reduce the occurrence of tooth skipping in a stochastic manner, or utilize the repulsion caused by tooth skipping to reduce the occurrence of tooth skipping.
There are known devices that drive the second lock bar.

However, for the synchronous type, the resin ratchet and lock bar are used for emergency locking, and for the ones that have multiple ratchets, lock bars, and acceleration sensing members, the second ratchet, lock bar, and acceleration sensing member are extra parts for emergency locking. It was installed on a type retractor, and was not necessarily superior in terms of number of parts, weight, price, and ease of assembly.

In view of the above points, the present invention is designed to elastically accumulate the energy applied to the lock bar due to tooth skipping when the lock bar and ratchet wheel skip, and by releasing this energy, the next ratchet tooth To provide an emergency locking retractor that reliably engages the retractor.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

In the embodiment shown in FIGS. 1 and 2, there are two frames, and this frame 2 has holes 6 for rotatably supporting the reel 4.
It is formed into a U-shape by mutually parallel side walls 10 in which fan-shaped holes 8 for pivotally supporting the lock part 32 are formed, and a bottom plate 14 connecting the side walls 10 and in which vehicle body mounting holes 12 are formed. ing.

The reel 4 consists of two ratchet wheels 16, a tube 18 with a C-shaped cross section, and a shaft 20. After inserting the loop portion of the belt 1 into the C-shaped groove 22 and inserting the shaft 20 into the hole 6 of the frame 2 through the pusher 24, the ratchet wheel is inserted into the hole 6 of the frame 2. 16
The shaft 20 is caulked and assembled.

One end of the shaft 20 extends outside the side wall 10, a groove 26 is formed, and the spring 28 has an outer end fixed to the side wall 10 of the frame 2 through a spring cover 30, and an inner end fixed to the groove 26. The reel 4 is energized in the belt winding direction.

The locking member 32 is pivotally supported in the fan-shaped hole 8 of the side wall 10 so as to be rotatably engaged with the ratchet teeth 17 of the ratchet wheel 16.

Further, a pendulum support stand 34 extends below the locking member 32 across the side walls 10 of the frame 2, and has a hole 36 substantially in the center thereof through which the shaft 42 of the pendulum device 40 passes.

A push-shaped elastic support member 38 is inserted into this hole 36 .

The elastic support member 38 is made of an elastomer material such as soft urethane or a material having elasticity and resilience such as rubber.

An annular peripheral protrusion 39 is formed at the upper open end of the elastic support member 38 to prevent the cap member from moving laterally.

The pendulum device 40 includes a cap member 44, a weight 46, and a shaft portion 42 that connects the cap member 44 and the weight 46 and passes through the hole 36.

Note that after the cap member 44 and the shaft portion 42 are constructed as one body, a weight 46 is assembled to the shaft portion 42 through the hole 36 by caulking or other means.

In the above structure, the pendulum device 40 is located in the vertical direction in the normal running state as shown in FIG. 3A.

Next, in the event of a collision or other sudden acceleration, the pendulum device 40 is tilted and the lock parr 32 is driven to rotate as shown in FIG. 3B, and the tip of the teeth 17 of the ratchet wheel 16 and the tip of the lock par 32 engage are doing.

Teeth skipping usually occurs under such conditions.

The lock par 32 is given repulsive energy by the ratchet wheel 16 and is violently rotated in the non-locking direction. is accelerated so violently that it delays or even destroys the lock.

Next, as shown in FIG. 3C, the repulsive energy is absorbed by the elastic member 38, and the left side in the figure is compressed to absorb the energy.

Therefore, the next ratchet tooth 17 is surely engaged.

Next, in explaining different embodiments of the present invention shown in FIGS. 4 to 6, the same parts as in the previous embodiments will be denoted by the same reference numerals, and redundant explanation will be omitted.

The embodiment shown in FIG. 4 is mainly different from the previous embodiment in that a compression spiral spring 50 is used. The cap member 44 of the pendulum device 40 is supported on a washer 56 energized by a compression spiral spring 50 .

The embodiment shown in FIG. 5 is mainly different from the previous embodiment in that an elastic member 58 using a leaf spring is used.
A leaf spring 58 is positioned across the two pendulum supports 34 protruding from the left and right side walls, and supports the cap member 44 through a hole in the center.

In the embodiment shown in FIG. 6, the main difference from the embodiment shown in FIGS.
In that the elastic support member 38a is provided in the inside of the elastic support member 38a, the same operation and effect can be obtained even with this structure.

As is clear from the above description, the present invention has the following effects.

(1) Even if accidental tooth skipping occurs, the lock bar always engages with the next ratchet tooth, so it is possible to reliably prevent the belt from extending out in a dangerous manner.

(2) Since the structure is simple, it can be made small, lightweight, and inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention, and Fig. 2 is a cross-sectional view showing an embodiment of the present invention.
3A, B, and C are explanatory diagrams showing the operating states of the main parts of the present invention, and FIGS. 4 to 6 each show different embodiments of the present invention. It is a main part explanatory diagram. 2...Frame, 4...Reel, 16
... Ratchet wheel, 17 ... Ratchet teeth, 34 ... Pendulum support, 38 ...
... Elastic support member, 40 ... Pendulum device, 42
...Shaft, 44...Cap member, 46
... Weight, 50 ... Spiral spring, 52 ... Spring housing, 58
...Elastic member.

Claims (1)

[Scope of utility model registration request] A frame having a U-shaped cross section, a reel rotatably supported by the frame for winding the belt, at least one ratchet wheel fixed to the reel, and urging the reel in the belt winding direction. The pendulum device includes a spring, a lock bar pivotally supported by the frame, a pendulum support fixed to the frame, and a pendulum device that passes through a hole in the pendulum support and has a cap portion above and a weight below. , the pendulum device is tiltable with respect to the pendulum support base, and when the pendulum device senses the acceleration of the vehicle body and tilts, the cap portion rotates the lock bar and engages with the ratchet wheel, thereby causing the belt to extend. In the emergency lock retractor for a vehicle safety belt, the cap portion of the pendulum device is supported by the pendulum support member via the elastic support member on the pendulum support base, and the teeth of the ratchet wheel collide with the tip of the lock bar. An emergency lock type retractor characterized in that when repulsive energy is applied to the lock bar in the anti-locking direction, the energy is absorbed by the elastic support member.