DE102013102752A1 - Fitting for the backrest of a sofa bed - Google Patents

Abstract

The invention relates to a fitting for guiding a backrest support (3) on a base frame (4) of a sofa bed (1) with which a backrest (2) is moved from a lower sitting position into a stable raised position by lifting (XX) the same is attached, the fitting (4) with a second retaining plate (7) attached to the base frame (5) and with a first retaining plate (6) on the backrest support (3) via an articulated gear made of four hinged struts (8, 9, 10, 11) is connected.

Description

The invention relates to a fitting for guiding a backrest support to a base frame of a sofa bed, with which a backrest is moved by lifting it from a lower seating position to a stable raised position, wherein the fitting with a second holding plate attached to the base frame and with a first retaining plate is connected to the backrest support via a linkage of four hingedly coupled to each other struts.

Sofa beds allow by twisting and unfolding a seat to make a reclining surface from a sitting position. Since a certain depth of the seat surface is required for a lying surface, it is necessary for a comfortable sitting position that the backrest of the sofa bed extends a good distance over the seat surface. But this can be hindered the twisting and unfolding of the seat. To avoid this, the backrest can be designed to be liftable. By raising the backrest, a free space can be created by which the lifting and twisting of the seat is made possible.

The invention has for its object to provide a fitting that connects the backrest support to the base frame of the sofa bed, while allowing for the backrest lifting in a stable raised position and is easy to use.

This object is achieved with the features of claim 1. Advantageous embodiments of the invention are specified in the subclaims.

The fitting serves to guide a backrest support on a base frame of a sofa bed, with which a backrest is moved by lifting from a lower sitting position to a stable raised position. The fitting is attached to the backrest support with a first retaining plate and to the base frame with a second retaining plate. The holding plates are connected via a linkage of four hingedly coupled struts.

• – an der zweiten Halteplatte eine untere Laststrebe und eine Führungsstrebe angelenkt sind,
• – und an der ersten Halteplatte eine obere Laststrebe und eine Gelenkstrebe angelenkt sind,
• – und die beiden Laststreben über ein erstes Knickgelenk verbunden sind,
• – und die Führungsstrebe und die Gelenkstrebe über ein zweites Knickgelenk verbunden sind,
• – und die Führungsstrebe so geformt ist, dass sie mit ihrem zweiten Knickgelenk über die obere Laststrebe hinausreicht und damit die Gelenkstrebe die obere Laststrebe kreuzt,
• – und in der oberen Laststrebe ein Führungsschlitz vorhanden ist, in den ein an der Führungsstrebe in der Nähe des zweiten Knickgelenkes angebrachter Führungsbolzen eingreift,
• – und eine Feder zwischen der zweiten Halteplatte und einem Befestigungspunkt an der unteren Laststrebe unterhalb des erste Knickgelenkes gespannt ist.

The fitting is characterized by the fact that

• A lower load strut and a guide strut are articulated on the second holding plate,
• And an upper load strut and an articulated strut are articulated on the first holding plate,
• - And the two load struts are connected via a first articulated joint,
• - And the guide strut and the joint strut are connected via a second articulated joint,
• - And the guide strut is shaped so that it extends with its second articulated joint on the upper load strut and thus the joint strut crosses the upper load strut,
• - And in the upper load strut, a guide slot is present, in which engages a mounted on the guide strut in the vicinity of the second articulated guide pin,
• - And a spring between the second holding plate and an attachment point on the lower load strut is stretched below the first articulated joint.

By this construction of the joint gear is achieved that the fitting and thus the backrest can take two stable positions, namely the lower seating position in which the backrest extends to the seat, and the raised position, in which the backrest is located above the seat and free space for lifting and twisting the seat.

Constructive details of an advantageous embodiment of the invention will be further described with reference to FIGS. Show it:

1 a sofa bed with raised backrest;

2a and 2 B the use of the fitting in the sitting position and the raised position;

3 the details of the fitting in the raised position;

4 the details of the fitting in a central position;

5 the details of the fitting in the lowered position;

In 1 is a sofa bed 1 with a raised by the lifting movement XX backrest 2 shown. The fitting 4 is between the base frame 5 and the backrest 2 holding backrest support 3 appropriate. Between the seat and the backrest in this position a large space is available, which allows the conversion of the sofa bed to lying surfaces. Between the fittings of the two sides of the backrest is a connecting rod 16 inserted, which synchronizes and stabilizes the movement.

The 2a and 2 B show a section through the sofa bed 1 and an increase in the position of the fitting 4 in the sitting position ( 2a ) and the stable raised position ( 2 B ). The fitting 4 connects each of the Grundgesell 5 and the, the backrest 2 carrying backrest carrier 3 ,

The 3 . 4 and 5 show the details of the linkage of the fitting 4 in the raised position ( 3 ), a middle position ( 4 ) and the lower position ( 5 ). At the first holding plate 6 that with an angled area 20 can embrace a backrest support are the upper load beam 9 and the joint strut 10 articulated about the hinge points B and A. At the second holding plate 7 are the lower load 8th and the guide strut 11 articulated about the hinge points G and F. The two load vines 9 . 10 are connected to each other in the first articulated joint E. The guide strut 11 is with the joint strut 10 connected via the second articulated joint C. Here, the second articulated joint C is behind the upper load strut 9 , The guide strut 11 is shaped approximately S-shaped and has a guide pin 13 who is in a leadership slot 12 the upper load strut 9 can run. By the arrangement of the hinge points A, B, C, E, FG on the struts 8th . 9 . 10 . 11 and the guide pin 13 in the guide slot 12 is the behavior of the linkage and thus the movement of the first plate 6 intended for the backrest. By the bend of the lower load strut 8th at its end to the second holding plate 7 at the hinge point G, it can be on the guide strut 11 move freely over. The stability of the fitting is due to a bulge of the material of the guide strut 11 and the joint strut 10 elevated.

The fitting assumes a lower stable position by an edge 21 the guide strut on the locking pin 17 strikes. The raised position is stably taken by the stop edge 18 at the angled area 19 the second holding plate strikes. The two stable positions are by the spring 14 supports that between the mounting bolt 15 near the first articulation E and the attachment point H at the angled portion 19 the second holding plate 7 is curious. The spring also holds 14 a distance to the lower load strut 8th one.

LIST OF REFERENCE NUMBERS

1

sofa bed

2

backrest

3

Backrest support

4

fitting

5

base frame

6

First holding plate

7

Second holding plate

8th

Lower load strut

9

Upper load beam

10

rigid strut

11

guide strut

12

guide slot

13

guide pins

14

feather

15

mounting bolts

16

connecting rod

17

locking pin

18

stop edge

19

Angled area of 7

20

Angled area of 6

21

Stop on the locking pin

A

Pivot point between 6 and 10

B

Pivot point between 6 and 9

C

second articulation

D

Guide point in 12

e

first articulation

F

Pivot point between 7 and 11

G

Pivot point between 7 and 8th

H

Attachment point of the spring

Claims (7)

Fitting for guiding a backrest support ( 3 ) on a base frame ( 4 ) of a sofa bed ( 1 ), with which a backrest ( 2 ) is moved by a lifting (XX) of a lower sitting position in a stable raised position, wherein the fitting ( 4 ) with a second holding plate ( 7 ) on the base frame ( 5 ) and with a first holding plate ( 6 ) on the backrest support ( 3 ) via a linkage of four hingedly coupled struts ( 8th . 9 . 10 . 11 ), characterized in that - on the second retaining plate ( 7 ) a lower load strut ( 8th ) and a guide strut ( 11 ), and - at the first holding plate ( 6 ) an upper load strut ( 9 ) and a joint strut ( 10 ), and - the two load struts ( 8th . 9 ) are connected via a first articulated joint (E), - and the guide strut ( 11 ) and the joint strut ( 10 ) are connected via a second articulated joint (C), - and the guide strut ( 11 ) is shaped so that it with its second articulated joint (C) on the upper load strut ( 9 ) and thus the joint strut ( 10 ) the upper load strut ( 9 ), - and in the upper load strut ( 9 ) a guide slot ( 12 ), in which one on the guide strut ( 11 ) in the vicinity of the second articulated joint (C) mounted guide pin ( 13 ), - and a spring ( 14 ) between the second holding plate ( 6 ) and an attachment point ( 15 ) on the lower load strut ( 8th ) is tensioned below the first articulated joint (E). Fitting according to claim 1, characterized in that the second retaining plate ( 7 ) an angled area ( 19 ) and at this an attachment point ( 15 ) for the spring ( 14 ), over which the spring ( 14 ) at a distance to the lower load strut ( 8th ) is held. Fitting according to claim 1, characterized in that the lower load strut ( 8th ) is cranked at its holding plate side end. Fitting according to claim 1, characterized in that the first retaining plate ( 6 ) an angled area ( 20 ), with one side of the backrest support ( 3 ) is embraced. Fitting according to claim 1, characterized in that the guide strut ( 11 ) is executed in approximately S-shaped and with its lower end in the raised position with a stop edge ( 18 ) to the angled area ( 19 ) of the second holding plate ( 7 ) strikes. Fitting according to claim 1, characterized in that the guide strut ( 11 ) in the sitting position with an edge ( 21 ) to a locking pin ( 17 ) on the second retaining plate ( 7 ) strikes. Fitting according to claim 1, characterized in that in the guide strut ( 11 ) and the joint strut ( 10 ) are formed central bulges for reinforcement.

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