DE102016211809A1 - Vehicle seat with telescopic seat-length adjustment - Google Patents

Abstract

The invention relates to a vehicle seat (100) having at least one seat rail unit (10) which has a seat rail (10A) fixed to the seat and a seat-side seat rail (10C) which is connected to a seat part (12) and / or a backrest part (14) of the vehicle seat (10). 100). It is provided that between the seat-mounted seat rail (10A) and the seat-side seat rail (10C), a further seat rail (10B) is arranged, which in an initial position (I) of the seat rail unit (10) moved into each other and moved apart in a telescopic position (II) are.

Description

The invention relates to a vehicle seat with at least one seat rail unit, which has a body-fixed seat rail and a seat-side seat rail, which is in communication with a seat part and / or a backrest part of the vehicle seat

The publication DE 44 40 116 A1 discloses an electric adjusting device for motor vehicle seats with an electric drive motor with gearbox and output shaft. The output shaft extends in the longitudinal direction of the seat and carries rotating rotation transmission members. These rotating rotary transmission members are selectively engageable with complementary counterparts by means of mechanical adjustment levers. The counterparts are rotatably connected to drive shafts, which are in each case with an actuator in engagement. The mechanical adjustment levers are simultaneously designed for switching on and off of the electric drive motor.

In the spatial design of the interiors of a vehicle is always the most generously dimensioned legroom of the vehicle seats in the second row of seats in the center. In the second row of seats, a rest position of the vehicle seats should be possible. Due to the limited interior length of the vehicle, the rest seat position in the second row of seats is possible only with an extended longitudinal adjustment of the front vehicle seat, in particular a passenger seat.

So far, an extended longitudinal adjustment is realized by an extension of the existing seat rails. However, this approach has the disadvantage that the extended seat rails, in particular the extended body-mounted seat rail, projects very far into the footwell. There is thus a conflict of objectives between the likewise desired foot clearance and the possible adjustment path. Especially in vehicles with a large difference in height between the sitting position and the sill such as SUV's this conflict of interest is particularly clear. An extended seat rail unit is clearly disturbing into the footwell with a corresponding extension.

The object of the invention is therefore to provide a solution that allows an extended seat-length adjustment without extending the seat rails of the seat rail unit. The starting point of the invention is a vehicle seat with at least one seat rail unit, which has a body-fixed seat rail and a seat-side seat rail, which is in communication with a seat part and / or a backrest part of the vehicle seat.

According to the invention it is provided that between the seat-mounted seat rail and the seat-side seat rail, a further seat rail is arranged, which are moved into each other in an initial position of the seat rail unit and moved apart in a telescopic position.

Thereby, advantageously, the invention, the seat rail unit over conventional seat rail units are telescoped to a greater length, the length of the conventional seat rail units need not be changed. It is possible to make the conventional seat rail units in the non-telescoped starting position shorter than before, since the telescopic length is generally greater than the possible in conventional seat rail units adjustment length.

In particular, the invention provides that the seat-side seat rail and the other seat rail simultaneously moved from the starting position in the telescopic position, in particular be moved. As a result, an overlay of the movements of the seat rails is achieved in an advantageous manner, which allows a rapid displacement of the rails from the starting position into the telescope position and ensures a space-saving arrangement of the seat rails in the starting position. Furthermore, the superposition of the movements of the seat rails leads to a cost-effective design of the associated drive unit. In addition, the seat rails are compact in the starting position in a short seat rail unit can be arranged. For the above and other advantages will be further elaborated in the accompanying embodiment.

According to the invention it is therefore preferably provided that the at least one seat rail unit is associated with a drive unit which causes a reversible simultaneous displacement of the seat-side seat rail and the other seat rail relative to the body-mounted seat rail from the starting position to the telescopic position.

The body-mounted seat rail and the other seat rail are particularly space-saving via a first bearing and the other seat rail and the seat side seat rail connected via a second bearing, the respective bearing ensures that the seat rails are arranged in a small space and friction with each other. The details of the invention for the design of the seat rails and the bearing are explained in detail in the embodiment.

According to the invention, it is provided that the further seat rail is connected to the drive unit via a connection structure.

In a possible embodiment, the drive unit comprises a drive and a drive worm whose worm thread transmits a rotational movement to a toothing of two separately arranged gears which are rotatably arranged on spindles whose external threads correspond to the internal threads of the gears. Thereby, the rotational movement of the gears is transmitted to the spindles, wherein it is provided that the first spindle with the body-mounted rail and the second spindle with the seat-side seat rail is in communication, wherein the gears are rotatably mounted in a housing, which via the connecting structure exclusively is in communication with the other seat rail.

The embodiment in the possible embodiment allows advantageously that a rotational movement of the drive screw leads to an opposite rotational movement of the internal thread of the mesh with the worm thread engaged gears on the external threads of the associated spindles, whereby on the one hand on the first spindle movement of the housing and so that a movement of the other seat rail relative to the body-mounted seat rail and on the other hand via the second spindle, a movement of the seat-side seat rail relative to the housing to a displacement of the seat-side seat rail relative to the other seat rail.

According to the invention, the seat rail unit has a short length in the starting position, wherein the seat-side seat rail and the further seat rail are arranged in the body-mounted seat rail, wherein the front sides of the seat-side seat rail and the other seat rail do not project beyond the front of the body-mounted seat rail.

In addition, it is provided that the seat rail unit in the telescope position has a total length, in particular telescopic length, a) from the length of the body-mounted seat rail and b) a first adjustment with the first length of the other seat rail relative to the body-mounted seat rail and c) a second adjustment of the second length of the seat-side seat rail relative to the other seat rail composed.

In an advantageous embodiment, it is further provided that the seat-side seat rail relative to the body-mounted seat rail compared to the other seat rail relative to the body-mounted seat rail to the first adjustment path with the first length and the second adjustment with the second length is adjustable, via the drive unit can be effected that the first and second adjustment of the seat-side seat rail exactly equal to twice the length of the first adjustment path of the other seat rail corresponds to the first length.

The invention will be explained below with reference to an embodiment with reference to the following drawings. Show it:

1 a vehicle seat in a side view with a telescopic seat rail unit in a non-extended starting position;

2 the vehicle seat in a side view with the telescopic seat rail unit in an extended telescope position;

3 the seat track unit and a drive unit in a perspective view; and

4 a structure of the vehicle seat and the seat track unit with the drive unit in a sectional view.

For purposes of the following description, the direction of travel of a vehicle shall be denoted by "x". With "-x" ("minus x") the usual direction of travel of a vehicle is referred to the front, with "+ x" ("plus x") the direction opposite to the usual direction of travel to the rear. In the following description, the x-axis as the reference axis is analogously transferred to the components moving in the vehicle. From this, the directions "y" and "z" are defined as follows. "Y" denotes the direction in the horizontal direction transverse to the x-direction. "Z" denotes the direction in the vertical direction transverse to the x-direction.

1 shows a vehicle seat which can be arranged in a vehicle 100 which is a seat part 12 and a backrest part 14 includes. In the embodiment, the seat part 12 over seat part connections 12A . 12B with a seat rail unit 10 connected. It is understood that a connection of the seat rail unit 10 as shown exclusively to the seat part 12 as well as a connection exclusively via a backrest part 14 or a combination thereof. The seat rail unit 10 is in 1 in a non-extended starting position I shown in the the seat rails 10A . 10B . 10C (see 2 ) are arranged such that the seat rails 10A . 10B . 10C compactly moved into a seat rail package, in particular pushed, so that extending in the x-direction overall length of the seat rails 10A . 10B . 10C hence the seat rail unit 10 is very short.

In particular, a front side of the seat rail unit protrudes 10 not over a front of the seat part 12 of the vehicle seat 100 out. This arrangement already constitutes an advantage of the invention compared with a conventional vehicle seat. In conventional vehicle seats, the front of the seat track unit protrudes from the non-extended starting position I the seat rail unit in the direction of displacement of the vehicle seat in -x direction over the front of the seat part 12 of the vehicle seat 100 out. In the conventional seat rail units, which are usually formed from a seat-mounted seat rail (hereinafter referred to as lower rail) and a Sitzteilfesten seat rail (hereinafter upper rail), namely the lower rail must be correspondingly long, so that a desired length of a seat-length adjustment can be guaranteed. As a result, the body-mounted lower rail is at least partially in the entry region of the passenger entering the vehicle, wherein a disadvantage of the conventional design is seen. In addition, this is the seat rail unit 10 not from the seat part 12 concealed so that the over the front of the seat part 12 protruding part of the seat rail unit 10 is disadvantageously visible in the respective viewing direction from above or from the side.

The invention solves these disadvantages. The seat rail unit 10 can in the non-extended starting position I be formed very short, and is as mentioned not on the front of the seat part 12 in addition, while the desired length of the seat longitudinal adjustment by a telescopic seat rail unit 10 is guaranteed, as explained in more detail below.

The seat rail unit 10 is in 2 in an extended telescope position II shown.

The seat rail unit 10 includes three seat rails 10A . 10B . 10C who are in the telescope position II are arranged displaced relative to each other.

It is understood that the seat rails 10A . 10B . 10C the seat rail unit 10 as in conventional vehicle seats are preferably arranged in pairs, but in principle the arrangement of a seat rail unit 10 is sufficient for seat length adjustment of the vehicle seat.

In the paired arrangement of the seat rail units 10 below a vehicle seat, however, as explained below, only one drive unit 20 needed that a displacement of the seat rails 10B . 10C a seat rail unit 10 causes, whereby a seat longitudinal adjustment of the vehicle seat 100 on both seat rail units 10 is accomplished, since the respective fixed seat top rails 10C over the arranged seat part fixed seat part connections 12A . 12B are connected to each other via the seat substructure.

The following description is based on the seat rail unit 10 , the drive unit 20 assigned.

The seat rail unit 10 and the drive unit 20 are in the 3 and 4 in a perspective view ( 3 ) and in a sectional view AA ( 4 ), wherein the following description in an overview of the 3 and 4 he follows. The same components are identified by the same reference numerals.

The figures show the seat part connections 12A . 12B , The seat part connections 12A . 12B connect the top rail 10C with the seat structure 12C of the seat part 12 ,

The top rail 10C is formed as an inverted "L" profile, so that a top of the short leg, the receiving surface for the seat part connections 12A . 12B forms.

On the long leg forms the top rail 10C a storage box consisting of horizontal walls oriented in the y-direction 10C-1 . 10C-2 and from a z-directional wall 10C-3 is trained. The storage box extends in the illustrated assembly situation on the outside of the upper rail 10C ,

External surfaces of the storage box of the upper rail 10C be in the assembly situation of a middle rail 10B encompassed. The middle rail 10B is formed as a "C" profile, wherein the leg inner sides of the short middle rail leg 10B-1 . 10B-2 in the assembly situation, the horizontal outer surfaces of the walls 10C-1 and 10C-2 embrace, with the long leg inner side of the middle rail leg 10B-3 in the assembly situation parallel to the arranged in the z-direction outer surface of the aligned in the z-direction wall 10C-3 is arranged.

Between the inverted "L" profile of the top rail 10C and the storage box of the center rail 10B a second bearing BC is formed, which allows for easy displacement of the upper rail 10C relative to the middle rail 10B ensures, in the embodiment, a ball bearing is shown.

Similarly, the bottom rail 10A also formed as a "C" profile, wherein the leg inner sides of the short sub-rail legs 10A-1 . 10A-2 in the assembly situation, the horizontal outer surfaces of the middle rail legs 10B-1 . 10B-2 embrace, with the long inside leg of the lower rail leg 10A-3 in the assembly situation parallel to the leg outer side of the middle rail leg aligned in the z-direction in the z-direction 10B-3 is arranged.

Between the "C" profiles of the center rail 10B and the bottom rail 10A is formed a first bearing AB, which for easy displacement of the lower rail 10A relative to the middle rail 10B ensures, in the embodiment, a ball bearing is shown.

The bottom rail 10A is disposed in a body-mounted angle profile W, which has a vertical profile section W1 and a horizontal profile section W2, wherein the outside of the designed as a "C" profile bottom rail 10A is fixed to the inside of the vertical profile section W2. The horizontal profile section W2 is fixedly connected to a body, whereby the seat rail unit 10 whose seat rails 10A . 10B . 10C are arranged displaceably relative to each other via the bearings AB, BC, are mounted in total on the body. The seat bottom rail 10A is thus indirectly connected via the angle profile W stationary with the body.

The angle profile W has at its profile sections W1, W2 each end a holding element W3, which are arranged in the y-direction orthogonal to the profile sections W1, W2 extending in the x-direction.

Between the inner sides of the holding elements W3 is a first spindle 20A the drive unit 20 arranged on the external thread a first gear 21A is arranged with an internal thread. The tooth flanks of the first gear 21A be upon actuation of the drive unit 20 from a worm thread of a drive worm 25 combed, being a worm shaft 25A the drive screw 25 with a drive 27 , in particular a motor drive, is in communication.

The worm shaft 25A is in a housing 29 stored (compare 4 ).

The top rail 10C also has at each end a holding element 10C-4 which in the y-direction orthogonal to the x-directional top rail 10C are arranged.

Between the insides of the retaining elements 10C-4 is a second spindle 20B the drive unit 20 arranged on the external thread a second gear 21B is arranged with an internal thread. The tooth flanks of the second gear 21B be upon actuation of the drive unit 20 also from the worm thread of the drive worm 25 combed.

In 3 are the spindles 20A . 20B According to a first embodiment, as seen directly in the z-direction one above the other. In 4 are the spindles 20A . 20B arranged offset according to a second embodiment seen in the z-direction. This makes it clear that the arrangement of the spindles 20A . 20B inside the case 29 is variable.

The gears 21A . 21B are direct, like that 3 and 4 clarify, in the case 29 rotatably mounted, whereby the non-rotatable spindles 20A . 20B indirectly via the gears 21A . 21B are also stored in the housing. The drive 27 is also stationary (cf. 3 ) on the housing 29 fixed.

The housing 29 is via a connection structure V with the middle rail 10B firmly connected, causing the housing 29 on the inside of the seat rail unit 10 together with the middle rail 10B is arranged to be movable in the x direction, in particular in the +/- x direction.

In other words, a movement of the housing leads 29 in +/- x-direction to a movement of the center rail 10B in +/- x-direction and thus to a shift of the middle rail 10B opposite the fixed bottom rail 10A ,

In addition, a movement of the upper rail 10C opposite the housing 29 to a shift of the upper rail 10C opposite the middle rail 10B because the middle rail 10B via the connection structure V fixed to the housing 29 connected is.

To realize one of the intended movements are in the housing 29 opposite on both sides of the first gear 21A entrainment 29A arranged, which is the first gear 21A in the case 29 hold and the case 29 in +/- x-direction, as soon as the first gear 21A with its internal thread on the stationary spindle 20A in one direction or the other.

In 3 is only the front of the two driver elements 29A shown which the housing 29 takes along when the first gear 21A on the first spindle 20A moved in -x direction.

To realize another of the intended movements are in the housing 29 opposite on both sides of the second gear 21B limiting elements 29B arranged the second gear 21B in the case 29 hold. As soon as the second gear 21B with its internal thread on the stationary spindle 20B turns in one direction or the other, the top rail 10C opposite the housing 29 moved in one direction or the other.

In 3 is only the front of the two boundary elements 29B shown, which is the second gear 21B in the case 29 stops when the second gear 21B on the second spindle 20B moved in -x direction.

By means of these embodiments, the following movement sequence can be realized according to the invention, which is explained below.

For extending the middle rail 10B opposite the bottom rail 10A and for extending the upper rail 10C opposite the middle rail 10 from the starting position I (see 1 ) into the telescope position II (see 2 ) becomes the worm shaft 25A the drive screw 25 for example, according to the arrow P1 (see 4 ) driven to rotate clockwise.

The gears 21A . 21B are with the worm thread of the drive worm 25 coupled so that the first gear 21A clockwise and the second gear 21B rotates counterclockwise. It is assumed that the teeth of the gears are identical.

In this opposite rotational movement of the gears 21A . 21B the first gear moves 21A above the internal thread of the first gear 21A on the first spindle rod 20A in -x direction and the housing 29 via the front driver element 29A in -x direction with.

At the same time, the second gear moves 21B over the internal thread of the second gear 21B on the second spindle rod 20B in the + x direction, the second gear 21B over the rear (not visible in the figures) limiting element 29B in the case 29 is held. As a result, the second spindle rod is displaced 20B in the desired manner in the -x direction.

It thus comes to the effect of being with the case 29 firmly connected center rail 10B displaced in the -x direction and at the same time the upper rail 10C opposite the middle rail 10B is also displaced in the -x direction, with the top rail 10C at the same time as the middle rail 10B and relative to the middle rail 10B is shifted in the -x direction.

By this arrangement and configuration of the telescopic effect of the seat rail unit 10 causes. The seat rail unit 10 with those in the bottom rail 10A lying seat rails 10B . 10C points (see 1 ) has an output length in the x direction as seen from L ₀ .

In the telescope position II (see 2 ) is the middle rail 10B opposite the bottom rail 10A longitudinally adjusted by a first length L ₁ in the -x direction. In other words, the middle rail 10B is about the first length L ₁ opposite the bottom rail 10A telescopic.

In the telescope position II (see 2 ) is also the top rail 10C opposite the middle rail 10B longitudinally adjusted by a second length L ₂ in the -x direction. In other words, the top rail 10C is about the second length L ₂ opposite the center rail 10A telescopic.

It becomes clear that the top rail 10C opposite the bottom rail 10A travels an adjustment that corresponds to the two lengths L ₂ + L ₁ .

It is understood that the seat rail unit 10 in the telescope position II a total length, in particular a telescopic length of L ₂ + L ₁ + L ₀ has.

It also becomes clear that the top rail 10C opposite the bottom rail 10A about an adjustment with the first and second length L ₂ + L _{1 is} adjustable.

In the embodiment, the selection of the teeth of the identical gears 21A . 21B and the selection of the same thread with respect to the trained spindle rods 20A . 20B causes the top rail 10C opposite the bottom rail 10A compared to the middle rail 10B opposite the bottom rail 10A by the double adjustment L ₂ + L _{1 is} adjustable. The middle rail 10B is opposite the bottom rail 10A adjustable by the simple first adjustment L ₁ . By changing the selection, the adjustment paths L ₂ and L ₁ can be influenced.

For retracting the middle rail 10B opposite the bottom rail 10A and for retracting the upper rail 10C opposite the middle rail 10 from the telescope position II (see 2 ) back to the starting position I (see 1 ) becomes the worm shaft 25A the drive screw 25 starting from the arrow P1 (cf. 4 ) driven in the opposite direction to the left rotation, whereby the return adjustment in the + x-direction is effected analogously to the described adjustment in -x direction.

In 4 is still hinted that the worm shaft 25A the drive screw 25 the drive unit 20 on a seat rail unit 10 can act alone or simultaneously on a second seat rail unit 10 can act, seen in the x-direction mirror image of the in the 3 and 4 shown seat rail unit 10 and drive unit 20 is trained.

LIST OF REFERENCE NUMBERS

100

vehicle seat

10

Seat track assembly

10A

seat-mounted seat rail (lower rail)

10A-1

 Under rail leg

10A-2

 Under rail leg

10A-3

 Under rail leg

10B

Seat rail (middle rail)

10B-1

 Means rail leg

10B-2

 Means rail leg

10B-3

 Means rail leg

10C

seat-stable seat rail (upper rail)

10C-1

 wall

10C-2

 wall

10C-3

 wall

10C-4

 retaining element

12

seat part

12A

Squab connection

12B

Squab connection

12C

seat structure

14

Backrest part

W

angle section

W1

profile section

W2

profile section

W3

retaining element

20

drive unit

20A

first spindle

20B

second spindle

21A

first gear

21B

second gear

25

drive worm

25A

worm shaft

27

drive

29

casing

29A

dogging

29B

limiting element

V

connecting structure

FROM

first camp

BC

second camp

I

starting position

II

telescopic position

P1

arrow

L ₀

Exit length of the seat rail unit

L ₁

first length of the first adjustment path of the middle rail 10B

L ₂

second length of the second adjustment of the upper rail 10C

-x

Direction in the usual direction of travel of a vehicle

+ x

Direction opposite to the usual direction + x

y

Direction in the horizontal direction transverse to the x-direction

z

Direction in the vertical direction transverse to the x-direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4440116 A1 [0002]

Claims (10)

Vehicle seat ( 100 ) with at least one seat rail unit ( 10 ), which has a seat-mounted seat rail ( 10A ) and a seat-side seat rail ( 10C ), which with a seat part ( 12 ) and / or a backrest part ( 14 ) of the vehicle seat ( 100 ), characterized in that between the seat-mounted seat rail ( 10A ) and the seat side seat rail ( 10C ) another seat rail ( 10B ) arranged in an initial position ( I ) of the seat rail unit ( 10 ) and in a telescope position ( II ) are arranged apart. Vehicle seat according to claim 1, characterized in that the seat-side seat rail ( 10C ) and the further seat rail ( 10B ) simultaneously from the starting position ( I ) into the telescope position ( II ), in particular be postponed. Vehicle seat according to claim 2, characterized in that the at least one seat rail unit ( 10 ) a drive unit ( 20 ) is assigned, which is a reversible displacement of the seat-side seat rail ( 10C ) and the other seat rail ( 10B ) relative to the seat-mounted seat rail ( 10A ) from the starting position ( I ) into the telescope position ( II ) causes. Vehicle seat according to claim 1, characterized in that the body-fixed seat rail ( 10A ) and the further seat rail ( 10B ) via a bearing (AB) and the other seat rail ( 10B ) and the seat-side seat rail ( 10C ) are in communication via a bearing (BC) and are movably arranged relative to one another via the respective bearing (AB, BC). Vehicle seat according to claim 1 and 3, characterized in that the further seat rail ( 10B ) via a connection structure (V) with the drive unit ( 20 ). Vehicle seat according to claim 5, characterized in that the drive unit ( 20 ) a drive ( 27 ) and a drive screw ( 25 ), whose worm thread rotation to a toothing of two separately arranged gears ( 21A . 21B ) which rotates on spindles ( 20A . 20B ) are arranged whose external thread with the internal threads of the gears ( 21A . 21B ) correspond, so that the rotational movement of the gears ( 21A . 21B ) on the spindles ( 20A . 20B ), the first spindle ( 20A ) with the body-mounted rail ( 10A ) and the second spindle ( 20B ) with the seat-side seat rail ( 10C ), wherein the gears ( 21A . 21B ) in a housing ( 29 ) are rotatably mounted, which via the connecting structure (V) exclusively with the further seat rail ( 10B ). Vehicle seat according to claim 5, characterized in that a rotational movement of the drive screw ( 25 ) to an opposing rotational movement of the internal threads of the meshing with the screw thread meshing gears ( 21A . 21B ) on the external threads of the associated spindles ( 20A . 20B ), whereby • on the one hand via the first spindle ( 20A ) a movement of the housing ( 29 ) and thus a movement of the other seat rail ( 10B ) relative to the seat-mounted seat rail ( 10A ) and on the other hand via the second spindle ( 20B ) a movement of the seat-side seat rail ( 10C ) opposite the housing ( 29 ) to a displacement of the seat-side seat rail ( 10C ) opposite the other seat rail ( 10B ) leads. Vehicle seat according to claim 1, characterized in that the seat rail unit ( 10 ) in the starting position ( I ) has an output length (L ₀ ), wherein the seat-side seat rail ( 10C ) and the further seat rail ( 10B ) in the seat-mounted seat rail ( 10A ) are arranged, wherein the front sides of the seat-side seat rail ( 10C ) and the other seat rail ( 10B ) the front of the body-mounted seat rail ( 10A ) do not exceed. Vehicle seat according to claim 1, characterized in that the seat rail unit ( 10 ) in the telescope position ( II ) has a total length, which is • from the initial length (L ₀ ) of the seat-mounted seat rail ( 10A ) and • a first adjustment path with the first length (L1) of the further seat rail ( 10B ) relative to the seat-mounted seat rail ( 10A ) and • a second adjustment with the second length (L2) of the seat-side seat rail ( 10C ) opposite the other seat rail ( 10B ). Vehicle seat according to claim 1, characterized in that the seat-side seat rail ( 10C ) relative to the seat-mounted seat rail ( 10A ) compared to the other seat rail ( 10B ) relative to the seat-mounted seat rail ( 10A ) about the first adjustment path with the first length (L1) and about the second adjustment path with the second length (L2) is adjustable, wherein via the drive unit ( 20 ) is effected, that the first and second adjustment (L1 + L2) of the seat side seat rail ( 10C ) exactly twice the length of the first adjustment path of the further seat rail ( 10B ) corresponds to the first length (L1).

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