DE2615789A1 - JOINT FOR SEATS - Google Patents

Description

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Joint for seats.

The invention relates to the joints of seats, i.e. the Devices by means of which a backrest of a seat is attached to the seat surface of the same around a seat surface which is bound to this seat surface horizontal axis can be attached pivotably and controllably, the seat in question preferably belonging to a vehicle and preferably equips a front seat of a passenger vehicle

The invention relates in particular to such joints those with the following parts:

- A firmly attached to the seat of the seat Eisenbe strike;

- an iron fitting $ firmly attached to the backrest

- one firmly connected to one of these iron fittings, inside toothed wreath?

- a disc with external toothing firmly connected to the other iron fitting, the external diameter of which is smaller than is the inner diameter of the ring gear, and which is arranged within the same so that it is in engagement therewith, i.e. it is eccentric in relation to it

- A rotatable actuator, which can be rotated about the axis of the disc or the ring and which is on the seat seated user is accessible;

- and Betäi'igungsmittel for converting the rotary motion Dgai

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of the actuator in non-slip rolling movements of the disc in the rim, these two elements in mutual Engagement are held.

Generally two such hinges are provided, one on each side of the seat concerned, wherein the rotatable actuator is generally common to the two joints and a transmission of the rotation of this member from one side to the other of the seat by means of a transverse rigid rod.

Such joints allow the actuator to rotate the very gradual change in the inclination of the backrest of the seat relative to the seat surface.

In the known embodiments, these joints include the actuating means essentially have a double pivot which is integral with the rotating actuating member and has two cylindrical, mutually eccentric bearing surfaces which are arranged so that they are in two bores are rotatable, of which one in the disc is coaxial with this and the other in the fixed with the ring gear connected iron fitting is formed coaxially to this wreath.

These embodiments have certain disadvantages, in particular that of "reversibility". This means the possibility of being able to operate the mechanism in reverse, see above that a twisting force exerted on the backrest can ultimately result in a rotation of the actuator.

This disadvantage is serious as there is a risk of it "rolling" or tilting under the seat back the effect of shocks from driving the vehicle or sudden braking, or simply by the Leaning of the user's back on the backrest result

To remedy this disadvantage of reversibility is already It has been proposed to assign independent locking systems to such joints, but such a solution is involved and expensive.

For the same purpose it has also been proposed that the eccentricity between the toothed ring and the toothed disk be possible to make it small. However, this has a high value of translation

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Tongue ratio between the rotations of the actuator and those of the backrest result in what is practical for any regulation requires considerable rotations of the actuator, which can achieve several revolutions.

In order to remedy these various drawbacks, a joint according to the invention of the above type is essential here characterized in that on the one hand the eccentricity between the ring gear and the toothed disc is provided so that radially between these two engaged parts, or more precisely between the two, the tops of the teeth of these two parts connecting cylinder surfaces, a space remains, which the general shape of an arc of order of magnitude 180 ° extending crescent, and that on the other hand, the actuating means has a part in the form of a crescent with smooth inner and outer surfaces, which practically fills this space, with means for rotationally fixed connection this part are provided with the actuator.

Preferred embodiments can also do that have one and / or the other of the following characteristics:

- The angles of convergence of each horn of half-murder are at most 7 at all points of this horn;

- the crescent-shaped part has the shape of a plate with parallel faces which are the same thickness as the Has the ring gear and the toothed washer;

the means for connecting the crescent-shaped part to the actuator include an axially attached thereto Part in the central zone of the same protruding pin and an intermediate piece which is firmly connected to the actuating member and has an eccentric sleeve which extends over this pin;

- In a joint according to the previous paragraph, the intermediate piece is a perforated disc, and the eyelet is through an axially drilled hole in an eccentric zone of this perforated disc is formed;

- The crescent-shaped part has the shape of a rib, which is attached to another, in particular by a perforated disc formed part protrudes;

- the ring gear is firmly connected to the iron fitting of the seat, while the toothed washer is firmly connected to the iron fitting the backrest is connected, and the crescent-shaped

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Part is for the mean normal incline of the Backrest in the upper position of its rotation about the axis of the actuator;

- the ring gear is firmly attached to the iron fitting of the The backrest and the toothed washer are firmly connected to the iron fitting of the seat, and the crescent-shaped part is located for the mean normal inclined position of the backrest in the lower position of its rotation about the axis of the actuator;

- in a joint according to the previous paragraph, the iron fitting of the backrest comprises two parts, one of which one, in the form of a grooved circular cam, is fixed is connected to the toothed disc, with which it preferably forms one piece, while the other, one of the cams below Contact surrounding hole containing a sliding bolt carries, which cooperate with the courage of the cam can that these two parts can be coupled to one another for rotation or uncoupled from one another ^

- The number of teeth of the ring and the disc are chosen so that the ends of the horns of the crescent-shaped part at most points either between two teeth belonging to the washer or rim or between two gaps between two teeth of the disc or rim lie;

- the number of teeth on the pulley is three units or more smaller than those of the teeth of the iCranium;

- for an inner diameter of the spider of on the order of 50 mm, the number of teeth on the disk and the rim is on the order of about twenty

- In a joint according to the previous paragraph, the toothed disc has 21 teeth and the ring gear has 24 teeth.

The invention is described below with reference to FIG the drawing explained by way of example.

Fig. 1 and 2 show in an axial section along the line I-I of Fig. 2 and in a cross section along the line II-II of FIG. 1 shows a backrest joint according to the invention of a seat.

Fig. 5 shows some components of this joint in

larger scale.

Fig. 4 is an axial section of another, too

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joint according to the invention.

Pig. 5 and 6 show in a side view along the arrow V of FIG. 6 "and in an axial section along the Line VI-YI of FIG. 5 still another joint according to the invention.

The joint of Figures 1 to 3 contains:

- An iron fitting 1, firmly connected to the frame 2 of the seat surface, in the form of a flat one metallic flange,

- An iron fitting J firmly connected to the frame 4 of the backrest of the seat, which also has the Has the shape of a flat metallic flange,

- an internally toothed ring 5 with a horizontal one Axis X, which is firmly connected to the iron fitting 1 and is formed here by a recess in this iron fitting,

- an externally toothed disc 6 with a horizontal axis Y different from X, which is firmly connected to the iron fitting 3 _p for which it z »B. is welded to this by welding points 7, the outer diameter of the disk being smaller than the inner diameter of the ring and its teeth meshing with those of the ring,

- An operating handle 8 which is fixedly connected to a pivot 9 which is in one in the Disc 6 is rotatably mounted coaxially to this formed bore 10,

- and a mechanism, which is discussed in more detail below, for converting the rotary movements of the Handle 8 in slip-free rolling movements of the toothed disc 6 in the Wreath 5

The eccentricity e_ between the disc and the rim and thus the difference between the diameters of the meshing toothing is chosen so that a crescent-shaped, over an arc of slightly over 180 extends Space is created between the two cylinder surfaces connecting the vertices of the two toothings.

A part 11 in the general shape of a symmetrical crescent, hereinafter called "crescent", is in the-

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arranged in a space, which it fills practically completely, except at his, "both ends too narrow. This crescent extends practically over an arc which is slightly smaller than 180 °.

The two curved surfaces of the crescent 11, i.e. its concave surface and its convex surface, are smooth, see above that they can slide along the apex of the teeth adjacent to these two surfaces.

As can be clearly seen from FIGS. 2 and 3, the crescent 11 is very fine. When you get your cut through one too the axes X and Y perpendicular plane and any straight line D (Fig. 3) of this plane considered, which through one of these Axes and the two circles delimiting this section in

Angle zv / ei points A and B intersects, is the / between the at these Circles at points A and B are preferably always smaller than 7 ° for a reason explained below.

This means that when E denotes the radius of one of the two circles under consideration, the eccentricity e_ is preferably less than 0.122R. Since also avoided must be that the crescent is too fine, one expediently selects a value of the order of magnitude for this eccentricity 0.12 R.

The crescent 11 is laterally formed by two flat surfaces limited. It is expedient by cutting out of a metal plate with the same thickness as the wreath 5 and the Washer 6 made.

The number of teeth on the disc is here by three units smaller than the number of teeth on the ring. Although this difference of three units is a preferred value, can he be taller

To prevent the horns or tips of the Crescent 11 when it was pinched (on ^ rich will be discussed below is) are deformed between the teeth surrounding them, the training is made so that these horns at almost all points of two opposite, den teeth belonging to the two toothings of the disk or of the rim or framed by two opposing tooth gaps and not on one side of a tooth and on the other of a gap between the teeth, but possibly of the

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A slight local pressure exerted on the horn in question This could result in this horn being pushed into the tooth gap

For a mean diameter of the teeth of on the order of 50 mm, each toothing expediently has about twenty teeth. Has in the illustrated embodiment the disk 6 21 teeth and the ring 5 24 teeth.

In addition to the above crescent 11, the actuating mechanism for converting the rotary movements of the handle 8 into slippage-free rolling movements of the disc 6 in the rim 3 includes a perforated disc 12, which is fixed to the handle by axially screwing in a screw 13 that passes through the bottom 14 of the handle Trunnion 9 is connected.

This perforated disk 12 contains a small eccentric hole 15 which has an axially on one of the flat sides of the Crescent 11 overlaps projecting pin 16 in the center of this page.

The perforated disk 12 can be replaced by any other rigid part which allows the crescent moon 11 transfer the rotations of the handle 8 about the axis Y su. Such a part can be a fork or an eccentric tab be, which is rotatably connected to the handle and with at least one hole or one stop of the crescent moon ·

According to another variant embodiment, which may prove advantageous, the crescent 11 forms itself a rib or a bent-up edge of a part, e.g. a perforated disc firmly connected to the handle 8.

This crescent 11 must be made of a very f arm-holding and Abrasion-resistant material can be produced. It can be done, for example, by molding a sintered material in the mold or by punching a plate.

Fig. 1 also shows a collar 17 which belongs to the pivot 9 and on the side facing away from the perforated disk 12 Disc 6 can slide, a flattened cutout 18 in one end of the pin 9 for receiving and guiding the perforated disk 12, wherein it forms a stop for a rotary movement and an axial displacement of this perforated disk, or more precisely for a bit of the disk 6 in the axial direction

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distant annular area 19 of this perforated disc, and a plate spring arranged between this area 19 and the disc 6 20, which shows the undesired displacements of the perforated disc 12 and thus the crescent 11 prevented or at least brakes under the influence of vibrations.

The handle 8 is so with a sliding fit in the bore

10 of the disk 6 with elastic axial compression of this disk inserted between the collar 17 and the perforated disk 12.

Furthermore, one sees in Fig. 1 a cross bar 21 with a square end piece 22 which can interact with an axial square recess 23 in the pin 9. This rod is used to transfer the rotations of the handle 8 to another i..echanismus, which like the one described above is formed and arranged on the other side of the seat. The above joint works like this: By twisting the handle 8 in one or the other in the other sense, the user of the seat shifts the crescent

11 between the two toothings which enclose it in contact, what gradually the angular position of the EiseribeSchlag 3 compared to the iron fitting 1 and thus the inclination of the backrest changed.

It should be noted, and this is a major advantage of the invention, that the above mechanism is self-locking in the sense that a force urging the backrest to twist is compressing or "pinching" one of the two horns of the crescent 11 between the two toothing sections surrounding this horn, as a result of which the crescent is clamped and the lifting mechanism is blocked *

The very low value given above of the various "angles of convergence ¹ 'of each horn of the crescent moon at all points of this horn" in fact prevents the compressive forces exerted on the horn from being able to "drive out" the horn.

It should also be noted that the type of actuation of the adjustments of the crescent moon 11 is relatively small Gear ratio between the rotations of the handle 8 and the corresponding pivoting of the backrest. This enables the example shown in FIGS. 1 to 3 one complete turn of the handle 8 the change

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the incline of the backrest by between 45 ° and 50 ° lying angle.

The embodiment modification shown schematically in FIG. 4 essentially uses the above with reference Measures described on the joint of FIGS. 1 to 3, which is why the elements in FIG. 4 are the same as the above elements bear the same reference numerals.

The main difference between this embodiment modification and the previous embodiment is in that the ring gear 5 is not firmly connected here to the iron fitting 11 of the seat, but to the iron fitting 3 of the backrest, while the reverse is the case with the toothed washer 6, which here is fixed to the iron fitting of the seat 1 is connected, to which it is in turn attached by welding points 7.

It should also be noted that in the first embodiment described, the crescent 11 is for the middle normal inclination of the backrest is in the upper position of its rotation about the axis Y, as shown in FIGS. In the variant embodiment of FIG. 4, however, there is the crescent 11 for the mean normal inclined position of the Backrest in the lower position of its rotation, as shown in this figure.

This measure offers the following advantage: The loads on the backrest are in the first case (Fig. 1 and 2) through the base of the disc 6 to the base of the rim 5 supporting this disc and in the second case (Fig. 4) through the The apex of the ring 5 is transferred to the apex of the disc 6 carrying this ring, in both cases due to the for The position chosen by the crescent means that the load is transferred directly from the toothing to the load-bearing toothing takes place without any flattening of the crescent between these teeth, which facilitates the maneuver of the same

It should also be noted that the above preferred positions of the crescent provide the following other advantage: In all cases there has been a twist of the handle from its the middle inclination of the seat corresponding position from a slight lifting of the seat and no lowering result, whereby

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it is avoided that the foam st off the volume of the lower part the backrest or the rear part of the seat is compressed which normally touch each other for the middle incline of the backrest.

Another difference between the two

compared versions is the following: while in the first embodiment of the flange 1 of the seat axially between the Flange 3 of the backrest and the perforated disk 12 is taken, it is in the second embodiment of the flange 3, which axially is taken between the flange 1 and the perforated disk 12. The maintenance of this mutual situation is done with the help of Tabs 24, 25 completed, which on one of the two Flanges are attached and each overlap one edge of the other flange ..

Note that when executing the Fig. 4- the operation of the handle 8 displacements of the iron fitting 5 of the backrest opposite the Y axis of the handle to Rim has, while in the embodiment of FIGS. 1 and 2, the axis Y remains fixed with respect to this Biseiibeschlag. As a result of this relative fixed position is generally given to the embodiment of FIGS. 1 and 2 of the delay, since the axis Y of the Handle S, the pin 9 and the rod 21 formed arrangement through the side facing of the backrest occurs so that it It is expedient that the passage parts of this arrangement are as narrow as possible due to the trim.

The joint of Figs. 5 and 6 is of the same type as that shown in Figs.

AueIa here carry those with already described Elements that are identical to elements have the same reference numerals.

The joint of FIGS. 5 and 6 differs from the first point because of the springy end: It is possible to cancel the rotary coupling of both of its iron fittings 1 and 3 in order to enable the backrest to be swiveled quickly, in particular for the transition from the position " Sit "in the" Lie "position, or vice versa.

The embodiment of FIGS. 1 and 2 can in fact very easily be modified so that such uncoupling is possible are.

For this purpose, the K; isen stop 3 of the backrest

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formed by two parts whose mutual rotary coupling can easily be established or canceled, namely one cylindrical cam or disc 26 with a circular outline, which has a radial Einochnitt 27 and fixed is connected to the toothed disc 6, with which it preferably forms one piece, and a flange 28, which the rest of the iron fitting 3 and has a cylindrical bore 29 surrounding the cam 26 with contact.

In addition, a sliding latch 30 is inserted into a radial cut 31 cLes flanges 28.

A spring 32 constantly exerts a force on this bolt 30, which force it into the incision 27 of the cam press seeks. The spring 32 is formed, for example, by an elastic wire which is bent upwards according to a large omega and bent-back ends is bent, whereby the The center of this omega is connected to a bolt 30 Pin 33 and its ends attached to two on the flange 28 Support stops 34-.

The bolt 30 can be pulled out of the incision 27 be pulled out on a cable 35 which is attached to the pin 33 by means of a cable lug 36.

In the general case in which the coupling in particular, it is desired to prevent the backrest from tilting afterwards in the back from their 'sitting position "with set bevel ^ Ite ^ u enable and to reintroduce the bolt 30 into the To facilitate incision 27 upon completion of the unlocked return and ensure that is on the side of this Return movement lying side surface 37 of this incision blunted.

The above mechanism works like this:

To cancel the rotary coupling between the two iron fittings 1 and 3, it is sufficient on the cable 35 against the return force to pull the spring 32 and so pull the bolt 30 out of the incision 27, and then the backrest around to turn a small angle backwards until the bolt comes to the truncated side surface 37.

The backrest can then be moved without using the handle 8 can be pivoted.

When the backrest is returned to the front, the

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Latch 30 on the truncated side surface 37 and then abuts laterally at the end of its stroke against the other side surface of the incision, as a result of which it is held radially in position opposite this incision long enough for the To allow renewed introduction of the bolt into the incision by relaxing the spring 32.

It should be noted that this is the case after the uncoupling restored angular position of the backrest is exactly that which was previously set.

One can also see in FIGS. 5 and 6 one on the flange 28 with the help of rivets 39 attached plate 38, which holds the bolt 30 axially in the recess 31 of the flange and a Has opening 40 for the passage of the pin 33, and also through the rivet 39 on the plate 38 facing away Side of the flange 28 attached tab 41 which overlaps an edge of the other flange 1.

Tongues bent from the plate 38 form the top mentioned notices 3 ^ ·

TJm to prevent the cable lug 36 from the Pin 33 comes free, a widening 42 is provided at the free end thereof with a cross-section which at least is equal to that of the opening of the cable lug, where süi is this The widening is connected to the rest of the pin by a narrowed zone 43 forming a seat for the cable lug.

The work and the advantages (especially the self-locking and the low reduction ratio) go clear from the above.

The invention can of course be modified. So can in particular the coupling between the two parts 26 and 28 of the iron fitting 3 of the embodiment of FIGS 6 in a different way than by the cooperation of a bolt sliding in one of the two parts with one in the other part formed radial incision can be made.

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Claims (1)

- 13 - 0144 76 B PATENTA IT SPR Ü C H E 1. Joint for seats for adjustable attachment of the backrest of the seat to the seat surface of the same, such that the backrest can be pivoted about a horizontal axis, with an iron fitting firmly connected to the seat surface, an iron fitting firmly connected to the backrest, a fixed with one of these iron fittings connected to the ring gear with internal teeth, an externally toothed disc firmly connected to the other iron fitting, the outer diameter of which is smaller than the inner diameter of the ring gear, and which is arranged within the same so that it is in engagement with this, ie opposite it is eccentric, a rotatable actuator which can be rotated about the axis of the disc or the rim and is accessible to the user sitting on the seat, and actuating means for converting the rotary movements of the actuator into slip-free rolling movements of the disc in the rim, these two elements in engagement are held, characterized in that the eccentricity between the ring gear (5) and the toothed disc (6) is chosen so that radially between these two interengaging parts, or more precisely between the two connecting the apices of the teeth of these two parts Cylindrical surfaces, a space is created ₉ which has the general shape of a crescent moon extending over a circular arc of the order of 180 ° "that the actuating means comprise a crescent-shaped part (.11) with a smooth inner and outer surface that practically fills this space" and that generally this part Connect (11) non-rotatably to the .actuating element (8). 2 * Sitz gelenk naeli claim 1 _9, characterized in that the convergence angles (A) of each horn of the crescent C11) at all points of this horn are at most 7 °. j5. Seat joint according to Anspx-ueh 2 _C. & achn? cJi denotes that _f if R is the radius of one of the two cylidrons bounding the moon _c the fesentrisität © iaen value £ of size ^ normal O ₉ 12 E iiate. 4. Seat joint according to © iasE. of claims 1 "to * ■ Ι · ^l i ', UL, /! J H 2 B - 0144 76 B characterized in that the crescent-shaped part (11) the Has the shape of a plate with parallel side surfaces, which has the same thickness as the ring gear and the toothed washer. 5. Seat joint according to claim 4, characterized in that that the means for connecting the crescent-shaped part (11) to the actuating member (8) one axially on this part in the central zone of the same projecting pin (16) and a structure which is integral with the actuator and has an eccentric eyelet that crosses the pin. 6. Seat joint according to claim 5, characterized in that that the structure is a perforated disc (17), and that the eyelet is axially in an eccentric zone of this perforated disc drilled hole (15) is formed. 7. Seat joint according to one of claims 1 to 3, characterized in that the crescent-shaped part (11) has the shape has a protruding rib on another part, in particular formed by a perforated disk. 8. Seat joint according to one of claims 1 to 7 »characterized in that the ring gear (5) fixed to the iron fitting (1) the seat and the toothed washer (6) is firmly connected to the iron fitting (3) of the backrest, and that the crescent-shaped part (11) for the mean normal incline of the backrest in the upper position of its rotation about the axis of the actuator is located. 9. Seat joint according to one of claims 1 to 7 »thereby characterized in that the ring gear (5) firmly with the iron fitting (3) of the backrest and the toothed washer (6) firmly with your Iron fitting (1) of the seat © Terbunden is, and that the crescent-shaped part (11) for the mean normal inclination of the backrest in our position of its "rotation about the axis of the actuating organ. IC. Sit ζ joint according to claim 8, characterized in that the iron fitting of the backrest consists of zv, ei -! - parts _f of which one (26) i-shape of a circular cam provided with a sine cut is firmly connected to the tooth cusp (S) is ^ iirend with which it preferably in © _s piece forms the other (28) surrounding a diessn HoÄen under contact hole, a sliding bolt (JO) bears which is connected to the iDinsohnitt '■' ·.> ": / ■ 4 / Γικ2 S - 15 - 0144 76 B (27) of the cam can work together in such a way that it has these two Coupling or uncoupling parts for one rotation. 11. Seat joint according to one of claims 1 to 10, characterized in that the number of teeth of the ring (5) and the disc (6) are chosen so that the ends of the horns of the crescent-shaped part (11) at most points either between two teeth belonging to the disk or the rim or between two tooth gaps between two teeth of the Disc or wreath. 12. Seat joint according to one of claims 1 to 11, characterized in that the number of teeth on the disc is three units or more smaller than the number of teeth on the ring is. 13. Seat joint according to one of claims 1 to 12, characterized in that for an inner diameter of the Gear rim of the order of 50 mm, the number of teeth of the Disk and the wreath are of the order of about twenty. 14. Sit ζ ge steering according to claim 12 and 13, characterized characterized in that the toothed disc 21 teeth and the Gear rim has 24 teeth. 609844/0826 to Blank page