WO2013075911A1

WO2013075911A1 - Articulated fitting for an adjustment device of a motor vehicle seat

Info

Publication number: WO2013075911A1
Application number: PCT/EP2012/071429
Authority: WO
Inventors: Wilhelm Wingensiefen
Original assignee: C. Rob. Hammerstein Gmbh & Co. Kg
Priority date: 2011-11-21
Filing date: 2012-10-30
Publication date: 2013-05-30
Also published as: DE102011086757A1; DE102011086757B4

Abstract

The articulated fitting for an adjustment device of a motor vehicle seat has a first articulated arm (30) which has a toothed quadrant (32), a second articulated arm (34), a pawl (36) which is coupled to the second articulated arm (34) so as to be pivotable about a pawl axis (38) and which has a flank (40) and a toothing (42), wherein, in a locking position of the pawl (36), the toothing (42) is in engagement with the toothed quadrant (32) and, in a release position, is free from the toothed quadrant (32), an adjusting cam (44) which is arranged on the second articulated arm (34) so as to be pivotable about an adjusting cam axis (46) and which has a clamping flank which, in the locking position of the pawl (36), is in contact with the flank (40) and which, in a release position, does not have any contact with the flank (40), and an actuating means (64) which acts on the adjusting cam (44) and, upon actuation, draws the adjusting cam (44) out of a clamping position into a release position. The articulated fitting further has a retaining means (54) which is movably connected to the actuating means (64). A counterpart (58) to the retaining means (54) is provided. When the actuating means (64) is not actuated, the retaining means (54) lies in a stop-ready manner opposite the counterpart (58) and prevents release of the adjusting cam (44). The actuating means (64) is connected to the adjusting cam (44) via a drag clutch.

Description

Articulated fitting for an adjustment device of a motor vehicle seat

The invention relates to a hinge fitting for an adjustment device of a motor vehicle seat, (a) with a first articulated arm having a dental arch, (b) with a second articulated arm (c) with a hinge axis about which the two articulated arms can be pivoted relative to each other , (d) with a pawl hinged about a pawl axis to the second articulated arm having a flank and teeth, the teeth being in a locking position of the pawl in engagement with the dental arch and in a release position from the dental arch is, (e) with an actuating cam, which is arranged pivotably about an actuating cam axis on the second articulated arm and which has a clamping flank, which is in the blocking position of the pawl in contact with the flank and which has no contact with the flank in the release position, and ( f) with an actuating means which acts on the adjusting cam and the adjusting cam from a clamping position in a Freiga order pulls.

Such a hinge fitting is known from US 4,875,735. Furthermore, reference is made to the state of the art mentioned in this US patent.

In the prior art hinge fitting the adjusting cam actuates and controls the pawl. In the blocking position of the pawl, the adjusting cam presses the teeth of the pawl into engagement with the dental arch of the first articulated arm. For this purpose, the clamping edge of the adjusting cam presses against the flank of the pawl, the engagement takes place at an angle which is smaller than the angle of the self-locking. The contact point between clamping edge and flank lies on a radial through the hinge axis, which also extends through the engagement region of the dental arch and toothing.

The Stellnocken also has a release flank. It is assigned a release flank of the pawl. When the adjusting cam is pivoted out of its clamping position, release flank and release flank come into contact, thereby the pawl is moved out of its locked position. In this state, the hinge fitting can now be adjusted. A hinge fitting of this type has proven to be extremely successful. It is widely used in motor vehicles. Its advantages and features, as described above, should therefore not be changed or modified, its basic construction should be maintained.

However, there is a problem with such hinge fittings: The clamping edge of the adjusting cam is frictionally engaged on the edge of the pawl. Although one chooses preferably a clamping angle which is smaller than the angle of the self-locking of the materials used, yet such clamping is not as safe as a Formschiuss, for example the Formschiuss between the toothing and the dental arch. In accidents in which the individual parts of a motor vehicle seat, and thus also the components of a hinge fitting, acceleration forces are subjected, it may happen that the clamping position is lost. If this is the case, however, serious accidents occur. The hinge fitting is then no longer necessarily locked, the interaction of tooth flank and toothing is no longer secure. All this is disadvantageous.

This is where the invention begins. It has set itself the task of the hinge fitting of the type mentioned while maintaining its basic design features so that the clamping between the pawl and parking cam is made safer and can not be solved especially in accident-related situations by the then occurring inertial forces.

This object is achieved on the basis of the hinge fitting of the type mentioned above in that the hinge fitting further comprises a holding means that the holding means is movably connected to the actuating means and is movable by the actuating means, that a counterpart to the holding means is vorge- seen that when unautätigtem Actuating the holding means to the counterpart stop ready opposite and a release of the parking cam prevents the actuating means is connected via a towing with the actuating cam, and that when the actuating means, the holding means is not the stop counter piece ready and a release of the parking cam not hindered. In this hinge fitting, the holding means in cooperation with the counterpart ensures that the clamping edge of the adjusting cam can not move so far from the edge of the pawl that the engagement of the toothing can be lifted in the dental arch. Thus, this procedure is maintained even in accidents. It is achieved a positive connection or contact between the holding means and counterpart. But this positive connection or contact is only a backup for an emergency, so for an accident. It does not prevent the clamping flank from moving slightly in relation to the flank of the pawl. But it prevents that the clamping edge can be released so far from the edge of the pawl that the engagement of the toothing can be canceled in the dental arch.

Primary it remains at the clamping, this is paramount. As soon as something is picked up, which can occur during an accident, the holding means comes into contact with the counterpart. This contact comes about before the pawl can pivot as far as possible due to the accident that their teeth are released from the dental arch. The interaction of the holding means and the counterpart therefore merely has to ensure that the pawl can not be inadvertently pivoted through an angle whose tangent value can be calculated from the tooth height of the teeth of the toothed elbow toothing and toothing to the distance of this tooth engagement from the pawl axis.

If one looks in this sense, the figure 2 of said US Patent 4,875,735 A, it can be seen that the adjusting cam can certainly be pivoted in an angular range of more than 10 °, before its clamping edge is so far from the edge of the pawl free that the Distance greater than the said tooth height is.

It is crucial that the interaction of holding means and counterpart does not interfere with the clamping between the clamping edge of the actuating cam and edge of the pawl or interferes with this clamping. The task of holding means and counterpart is to allow this clamping, but after an automatic release of the clamping to prevent the engagement of the dental arch and toothing. Only when the actuating means is deliberately and willingly operated can the engagement of the dental arch and the toothing be canceled. Only then can the adjusting cam swing the pawl far enough, that it has sufficient distance from the dental arch, so that it is no longer in engagement with the toothing.

Preferably, the joint axis, positioning cam axis, clamping and engagement region of the toothing and the dental arch lie on a straight line, namely the already mentioned radial. Preferably, a tangent to the engagement portion of toothing and dental arch is such that it passes through the pawl axis. Preferably, the adjusting cam is biased by an elastic means, in particular a leg spring or a tension spring, in a rotational direction so that it is loaded in the clamping.

Further advantages and features of the invention will become apparent from the other claims and from the following description of four non-limiting embodiments of the invention, which will be explained in more detail with reference to the drawings below. In this drawing show:

1: a perspective assembly image of the joint fitting, FIG. 2: a rear view of the assembled joint fitting,

Fig. 3: a front view of the assembled hinge fitting, the fitting is locked. 4 shows an illustration as in FIG. 3, but in a state such as occurs during an accident, for example, there is a form fit between the holding means and the counterpart, the clamping flank has moved slightly in relation to the flank of the pawl, FIG Representation as Figure 3, but for an intermediate state in the deliberate release of the fitting, the actuating means is actuated by a small amount and has already moved the holding means, but not yet the adjusting cam, Fig. 6: the illustration of Figure 5, but now in a further intermediate state, the actuating means has now moved the adjusting cam by a first amount, Fig. 7: a view according to Figure 6, but in a further intermediate state, the actuating means has now moved the adjusting cam so far that a driver flank of the actuating cam is in contact with a release flank of the pawl, this contact has already led to the fact that the toothing is no longer in complete engagement with the dental arch, the hinge fitting is still locked,

Fig. 8: A representation in connection with FIG. 7, in a state in which the adjusting cam has pivoted the pawl so far that now the engagement of toothing and dental arch is canceled, the hinge fitting is no longer locked. the hinge fitting according to Figure 8 in a position after a successful adjustment of the first articulated arm relative to the second articulated arm, a perspective view of the actuating means, the adjusting cam and the holding means, a perspective view as Figure 10, but in a different direction, a representation similar to Figure 3, but for a second embodiment, a representation like Figure 12, but for a third embodiment and

Fig. 14 is a representation like Figure 12, but for a fourth embodiment. Figures 1 to 11 relate to the first embodiment. Figures 12, 13 and 14 relate to the second, third and fourth embodiments. The latter are discussed only to the extent that they differ from the first embodiment.

In the figures, a hinge fitting is shown, which is part of a larger joint in the region of a backrest of a motor vehicle seat. A backrest 20 can be angularly adjusted relative to a lower part 22 on the one hand via a Verstellbeschlag 24 in different positions of use, on the other hand, they can be quickly folded forward, on the other hand, the inventively designed hinge fitting 26 is provided. In both fittings 24, 26, the adjustment takes place about a hinge axis 28. The hinge fitting 26 has a first hinge arm 30 having a dental arch 32, and a second articulated arm 34. It further has a pawl 36 which pivotable about a pawl axis 38 on the second Articulated arm 34 is articulated. The pawl 36 has a flank 40. It further has a toothing 42 which is adapted to the dental arch 32 and cooperates therewith, as shown for example in FIG. In Figure 3, the locking position of the pawl 36 is shown. As a result, the hinge fitting 26 is locked. In Figure 8, a release position of the pawl 36 is shown, in this state, an adjustment of the hinge fitting 26 take place, in this state, the backrest 20 can be tilted forward freely.

The hinge fitting 26 also has an actuating cam 44, which is articulated about an actuating cam axis 46 pivotally mounted on the second articulated arm 34. The locking cam 44 has a clamping edge 48. In locking position of the pawl 36 (see FIG. 3), the clamping edge 48 is in contact with the flank 40. As a result, the engagement of the dental arch 32 and the toothing 42 is maintained. So that the pawl 36 can be brought into a release position, the clamping edge 48 must first be pivoted away from the flank 40. Only then is the path of the pawl 36 free from a locked position to a release position.

In the drawing, Figures 5 to 8 show individual snapshots of intermediate positions of the transition from the locking position to the release position of the hinge fitting 26. In the state shown in Figure 5 is still a contact between clamping edge 48 and flank 40 before. In the state according to FIG. 6, the adjusting cam 44 is already slightly counterclockwise by means of an actuating means 64. In the state shown in Figure 7 abuts a Mitnehmerflanke 50 of the actuating cam 44 against a release edge 52 of the pawl 36. As a result, the pawl 36 is pivoted clockwise and can be in the release position reach. In the state shown in Figure 8, the release position is reached.

In order to prevent an automatic release of the adjusting cam 44 and thus a free coming of the clamping edge of the flank 40, a holding means 54 is provided. It is formed in the first embodiment as a tooth. It is provided on a blocking part 56. The locking member 56 is pivotally mounted about the adjusting cam axis 46 and vertically displaceable. The holding means 54 cooperates with a counterpart 58, which is formed in the illustrated embodiment as a stage of the pawl 36. In the locked state of the hinge fitting holding means 54 and counterpart 58 are opposite each other at a distance. If the blocking part 56 pivots about the setting cam axis 46, which can occur, for example, in the event of an accident, then there is a stop of holding means 54 for the counterpart 58. In the normal state, the holding means 56 abuts the counterpart 58, without causing a stop , As a result, the holding means does not hinder the clamping between the clamping flank 48 and the flank 40. The latter clamping is primary. The stop of the holding means 54 and counterpart 58 only comes about when the clamping between clamping edge 48 and flank 40 is already lifted something. In the illustrated embodiment, the locking member 46 has a portion 60 which is similar to the clamping edge 48 is formed and above this, he is the flank 40 opposite. This region 60 can be configured such that it, like the clamping flank 48, impedes release of the pawl 36. FIG. 4 shows a condition that occurs during an accident. Without actuation of the actuator accidentally the adjusting cam 44 has moved slightly in the counterclockwise direction, as can be determined by comparing Figures 3 and 4. The locking member 56 has moved in the same sense. The holding means 54 is in abutment against the counterpart 58. A free pivoting of the pawl 36 in a clockwise direction is not possible because the movement is blocked by the locking member 56 and the adjusting cam 44. The locking member 56 is pressed by a biased arm of a spring 62 in a holding position, as shown in Figure 3 can be seen. The spring 62 is arranged and biased so that it presses the locking member 56 down and at the same time pushes forward, so that it presses the adjusting cam 44 indirectly in the clamping direction. Starting from these two positions of actuating cam 44 and locking part 56, adjusting cam 44 and locking part 56 can now be deliberately moved into a non-locking position, as shown in FIG. For this movement, the actuating means 64 is provided. The actuating means 64 has in the illustrated embodiment a train, in particular Bowden cable 66. The jacket of this Bowden cable 66 is fixed to the second articulated arm 34, see Figure 2. The soul is connected to a pin 68 which is fixed in a hole 70 of the locking member 56 and a slot 72 of the actuating cam 44 passes through. In a train in the Bowden cable, the locking member 56 is moved immediately upward and only then pivoted, the adjusting cam 44 is only moved when the pin 68 has reached the end of the slot 72. Pin 68 and slot 72 represent a towing coupling. When pulling in the Bowden cable 66, the locking member 56 is first raised starting from the position shown in Figure 3 in the position shown in Figure 5, then it is pivoted together with the actuating cam in the in Figure 8 shown position. Figures 6 and 7 show intermediate positions. In order for the blocking part 56 to be lifted, a long bearing hole 74 of the blocking part 56 surrounds the positioning cam axis 46, as can be seen from FIG. The locking member 56 is pressed by the spring 62 in the position in which the actuating cam axis 46 is located at the upper end of the long bearing hole 74. In an alternative, it is possible to provide for the locking member 56 and the adjusting cam 44 each have their own spring.

FIGS. 12 to 14 show basic illustrations for explaining further possible solutions. As in the first embodiment, a window 76 is provided in the second articulated arm 34, which serves to transmit the operation from one side to the other side of the second articulated arm 34. While in the first embodiment, the pin 68 extends through this window 76, it is in the other embodiments of the Bowden cable 66, which extends through this window 76. In all three other embodiments, a tow coupling between the soul of the Bowden cable 66 and the adjusting cam 44 is again provided. It is in each case designed such that one end of the core of the Bowden cable 66 engages in a slot which is formed in the adjusting cam 44 and extends substantially in the pulling direction of the Bowden cable 66. In the locking position of the pawl 36, the lower end of the soul is in the part of the slot which is close to the pawl 36. With the soul, a locking member 56 is further connected, which is now designed as a body which is fixed or hinged to the soul.

In the embodiment of FIG. 12, the locking member 56 is guided obliquely in the window 76 so as to be longitudinally displaceable. This locking member 56 forms at its lower portion of the holding means 54 which is opposite to the Mitnehmerflanke 50. In the position shown in FIG. 12, the adjusting cam 44 can pivot counterclockwise only over a small angle, for example under conditions of accidental loading, after which its driver flank 50 strikes the holding means 54.

If the Bowden cable 66 is pulled, the locking member 56 initially disappears obliquely downward and thus out of the way of the adjusting cam 44, then, when the clearance is consumed in the tow coupling, and the adjusting cam 44 is freely swung. The locking member 56 now obstructs the path of the actuating cam 44 not further, so that this position shown in Figure 7 and Figure 8 can be pivoted. In the second to fourth embodiments, a spring 78 is provided, which pre-loads the adjusting cam 44 in the clamping position, as shown in each case. This spring 78 is identical to the spring 62nd

In the second embodiment of FIG. 12, the blocking part 56 is arranged on the second articulated arm 34. It is slidably guided in a window 76. The guide is oblique to the surface of the second articulated arm 34. In the third embodiment, the locking member 56 is pivotally mounted on the adjusting cam 44. It is designed as an arm, which is elastically biased by the release flank 52 transversely away and is pivotally mounted on the adjusting cam 44 at one end. Preferably, the locking member 56 as an arm of a spring, for example, leg spring formed. At its free end, the arm is connected to the core of the Bowden cable 66. the. Again, a towing clutch is provided. In the position shown in Figure 13, the locking member 56 obstructs a pivotal movement of the actuating cam 44 counterclockwise. By pulling the core of the Bowden cable 66, the locking member 56 is pivoted out of the way, so that it no longer hampers the contact of the release flank 52 with the Mitnehmerflanke 50.

In the embodiment of Figure 14, a solution is shown, which is similar to the solution according to Figure 13, but now executed as an arm locking part 56 is hinged to the pawl 36. The holding means 54 is again formed by the other end of the arm, which is located in the vicinity of the soul of the Bowden cable 66. Again, a towing clutch is provided.

The counterpart is preferably formed as a tooth and is located outside the movement range of the Stellnockems 44. The locking member 56 preferably has a slot, so that it is rotatable and displaceable. A suspension bolt for the Bowden cable 66 is preferably riveted into the locking member 56 and moves in a slot in the adjusting cam 44. The receiving holes designed as a leg spring spring 78 in locking member 56 and adjusting cam 44 are to be arranged as slots so that the locking element down and the Adjustment knobs 44 are pressed in the direction of adjustment.

It is advantageous that only one additional component is necessary, it can be formed small and accommodate the existing space. The movement occurs with each actuation, there is no danger of setting over the life. The lock function is constantly engaged except when unlocking.

Claims

claims

1. hinge fitting for an adjustment device of a motor vehicle seat

a. with a first articulated arm (30) having a dental arch (32),

b. with a second articulated arm (34),

c. with a hinge axis (28) about which the two articulated arms can be pivoted relative to one another,

d. with a pawl (36) which is hinged about a pawl axis (38) pivotally mounted on the second articulated arm (34) and which has a flank (40) and a toothing (42), wherein the toothing (42) in a locking position of the pawl (36) is in engagement with the dental arch (32) and is free in a release position from the dental arch (32),

e. with an adjusting cam (44) pivotally mounted about an actuating cam axis (46) on the second articulated arm (34) and having a clamping flank in contact with the flank (40) in the locking position of the detent pawl (36); Release position has no contact with the edge (40), and

f. with an actuating means (64) which acts on the adjusting cam (44) and, when actuated, pulls the adjusting cam (44) from a clamping position into a release position,

characterized in that the hinge fitting further comprises a holding means (54) that the holding means (54) is movably connected to the actuating means (64) and by the actuating means (64) is movable, that a counterpart (58) to the holding means (54) is that when the actuating means (64) is unactuated, the holding means (54) opposite to the counterpart (58) ready stop and a release of the actuating cam (44) prevents the actuating means (64) via a toggle with the adjusting cam (44) is connected, and that when actuation means (64) actuated the holding means (54) is not opposite to the counterpart (58) ready to hit and does not hinder a release of the adjusting cam (44).

2. Hinge fitting according to claim 1, characterized in that the actuating means (64) directly on the holding means (54) engages and that the actuating means (64) via the towing clutch on the adjusting cam (44) engages.

3. hinge fitting according to claim 1 or 2, characterized in that the towing clutch is adjusted so that first the holding means (54) pulled free and then the actuating cam (44) is pulled free.

4. Hinge fitting according to one of the preceding claims, characterized in that the holding means (54) is associated with a spring (62) biasing the holding means (54) in a holding position, and that in the holding position, the holding means (54) ready to attack the counterpart (58).

5. Hinge fitting according to one of the preceding claims, characterized in that the adjusting cam (44) has a slot (72), that the locking part (56) has a hole (70), that the actuating means (64) has a pin (68) passing through the slot (72) and through the hole (70).

6. Fitting according to one of claims 1 to 4, characterized in that the locking part (56) has a hole (70) in which a pin (68) is fixed, that the pin (68) has a slot (72) of the adjusting cam (44) passes through, and that the pin (68) is connected to the Bowden cable (66).

7. Articulated fitting according to one of the preceding claims, characterized in that the holding means (54) on the second articulated arm (34), on the adjusting cam (44) or on the pawl (36) is arranged.