MXPA01003713A - Vehicle seat locking device - Google Patents

Abstract

Locking device for the rear seat of a vehicle which comprises a pawl (3), a trigger (1) and a nut housed into a recess (2) of said trigger, the locking device making the assembly safer in relation to undesired openings.

Description

"Vehicle seat lock" The invention relates to a rear seat lock of the vehicle with incorporated anti-unlocking systems, applicable to folding rear seats, of the type that have a lock assembly with a ratchet and a trigger that rotate associated with a common spring and a bolt that is picked up by an entrant of the trigger.

The lock is mounted on a body-base and is placed either on the back of the seat, or on the body of the vehicle, in combination with the corresponding bolt which in turn is anchored in tune, either on the body of the vehicle, or on the folding seat.

This type of locks have as its primary mission to enable the use of the passenger seat, anchored lock, or fold the seat by expanding the space for trunk or lock open.

In the anchored or closed position, the lock must withstand the legal requirements and manufacturer's own specifications regarding safety in the event of an accident.

One of the dynamic tests that must endure the hard-closing is the frontal impact of the vehicle, in which it must withstand loads towards the front of the vehicle caused by the inertia of the masses of the seat, luggage of the trunk and passengers , thus protecting the latter.

Normally the significant loads are in the direction and sense exposed and all the locks of the market are designed to support them.

However, there is the circumstance that in certain • * «:.

Vehicle body structures appear during the collision in the opposite direction, towards the rear of the vehicle, which generates an opposite reaction of the lock-bolt system, resulting in the involuntary opening of the system, failing to meet the requirements of security.

As we will see later in relation to the sheets of drawings that are attached, the trigger and ratchet of the lock are normally found in this type of assemblies, in frontal surface contact, in which the aforementioned contact surface served as support and top of the ratchet movements. Due to the reaction to the resultant loads in the backward direction, the trigger immediately forces the ratchet and impacts on it, so that when in superficial contact, there is a turn of the trigger with very high speed and acceleration, so that once it contacts the ratchet, it causes the ratchet to move in the opening direction, allowing it to turn the trigger in turn and the subsequent unlocking of the bolt, which initially was controlled.

It is therefore an object of the invention to provide a solution to the compartment involuntary opening of the system in case of loads in the longitudinal direction and towards the rear of the vehicle, fully and completely complying with all safety regulations.

For the implementation of this basic objective, the invention claims in a lock of this type equipped with ratchet and trigger, both of which are connected by a spring tending to ensure the closed position of the assembly, the fact that both, ratchet and -Front front with a safety distance; the maintenance between the two of an auxiliary surface contact, in which the two surfaces in contact are arranged in such a way that the contact pressure passes through the center of rotation of the pawl to prevent accidental opening; the fact of controlling the rotation of the ratchet in order to avoid transmission of movement from the trigger to the ratchet.

Alternatively, this last point claimed, can be carried out through different practical solutions.

The sheets of attached plans will help to understand the idea and concepts of the invention, and in them, without any limiting character, the following is represented: - Figure 1 ^ represents the traditional assembly and the arrangement between the ratchet and the trigger in the lock.

- Figure 2i shows the two loads that appear due to a frontal crash.

- Figure 3 ^ represents the lock according to the invention in the closed position, incorporating a preferred alternative for controlling the rotation of the ratchet.

- Figure 42-, represents the lock of fig. 3 ^ in open position.

- Figure 5a is a detail of another configuration for controlling the movement of the ratchet.

Ratchet twist. ~, «• > . According to fig. 1 ^, warn "the traditional lock" 5 used, mounted on a base (13), based on a ratchet (3), a trigger (1) and an intermediate spring (11). Both parts rotate in their respective axes, and the trigger has a hole or recess (2) in which the pin is received, not shown. This lock can be mounted on the seat or on the body of the vehicle, corresponding to the bolt arranged on the body or on the seat, respectively.

We appreciate in this figure, as trigger and ratchet-5 they present a frontal contact between the surfaces (5,6), contact that when they generate loads their direction and rear sense (+ x), cause that the ratchet (3) hits the trigger (1) and the rotation of the latter will inevitably occur in a clockwise direction allowing 0 the bolt to leave its housing in the space (2) causing the opening of the system and the folding down of the backrest.

Fig. 2t, allows us to appreciate graphically the existence of the carcas (-x) supported by the conventional system and the loads (+ x) for which the system is not prepared and which generate the aforementioned risks. 0 According to fig. 3 £, the lock body (13) with the trigger (1) and ratchet (3) is shown, arranged so that the front surfaces of both (5,6) are at a distance that avoids their contact, providing another contact surface (7,8) between 5 trigger and ratchet whose function is to support the If the dynamic test or in case of an accident, avoid the rotation of the trigger (1) clockwise with respect to its center of rotation (12).

Both lateral surfaces (7, 8) have a circular plan and are arranged in such a way that the prolongation of the contact pressure passes through the center of rotation (4) of the pawl to avoid accidental openings.

Under these conditions, the rotation of the trigger in the clockwise direction with respect to its center (12) is avoided, always keeping the bolt lodged in the recess (2) of the same 5 m.

To position the pawl (3) with respect to the trigger (1), two other surface areas (9, 10) are enabled in contact, arranged in such a way that their pre¬ Contact 20 passes through the center (12) of the trigger, preventing the transmission of movement from the trigger to the ratchet.

In the opening cycle of the lock, the application of a force (Q) on the ratchet starts with the control of the lock, not shown, causing a torque in the clockwise direction with respect to the center (4), with which produces a mutual sliding between the surfaces (7,8) up to reaching dis¬ fasten the system completely, as shown in fig. 4 £. In this unlocking, an additional surface area (14) of the trigger (1) contacts the surface (8) of the ratchet (3).

In this way the rotational movement of the , rity that the cylindrical surface (14) has an axis that is coincident with the axis of rotation of the trigger.

The opening control of the lock that causes the force (Q) can be of any type, pushbutton, lever, lever etc.

As shown in fig. 4 ^, the ratchet (3) has had a controlled movement in a clockwise direction and the trigger (1) also and in the same direction has rotated to allow the exit of the pin of the recess (2).

The closing cycle is initiated when the bolt presses the surface (18) of the trigger (1) causing a torque counterclockwise on the center of rotation (12), turning the trigger and sliding the ratchet (3) on the surface (9). ) until reaching the closed position. At this moment, the pawl (3) rotates counterclockwise about its center (4) due to the torque created by the spring (11) until, again, the surfaces (9, 10) are in contact - fig. 3 £.

The rotation limit of the ratchet (3) in the counterclockwise direction may be carried out by means other than that mentioned. Thus, according to fig. 5 ^, a circular groove (15) is made in the body (13) of the lock, and the ratchet itself is provided with a solid pivot (16) abutting said groove.

Another variant solution will consist, according to fig. 6§, in placing an additional stop (17) fixed on the support plate (13), for example a rivet, whereby the pawl is limited in rotation by its contact with Í .. ¿.f * In these last two variant solutions, it is obvious to note that the surfaces (l?) ^ Of the trin-quete and the surfaces (9,14) of the trigger disappear.

With all this and as indicated previously the application of the invention avoids the undesired opening, safety condition, against loads in the direction and sense different from the normal use, as they may occur in case of accident, deceleration brusque ... etc. 8SÍM.V «& -" «*

Claims (1)

12. - Vehicle rear seat lock, with a lock equipped with trigger (1) and ratchet (3) that rotate interconnected by a spring (11) and housed in a body-base (13), in which the trigger shows a susceptible housing of receiving an anchor bolt so that in the locked position, the pawl prevents the trigger from turning in the unlocking direction with cylindrical surfaces (7,8) of the pawl and trigger respectively whose contact pressure passes through the center of the detent. turn (4) of the ratchet, characterized by: between the trigger (1) and the ratchet (3) there is a separation such that the absence of transmission from the trigger to the ratchet is guaranteed, -the ratchet (3) has limited its movement of rotation within a narrow range of tolerance. 2 = .- Vehicle rear seat lock, according to claim 1, characterized in that the limitation of the movement of the ratchet (3) is made by a lateral cylindrical additional support surface (8) of said ratchet, which corresponds and it is received on another lateral cylindrical surface (14) of the trigger (1). 32. - Vehicle rear seat lock, according to claim 12, characterized in that the limitation of the movement of the ratchet (3) is effected by the combination of a slot (15) made in the plate-support (13) of the lock, and a solid pivot (16) with the pawl abutting inside said groove. 42. - Vehicle rear seat lock, according to It is moved by an additional stop (17) fixed on the support plate (13) which contacts said pawl. A rear seat lock of vehicle having a ratchet (3), a trigger (1) and a bolt 5 housed in a recess (2) of said trigger, according to which the safety of the assembly is increased against unwanted openings. 10 fifteen twenty 25 30 35