WO1988009139A1

WO1988009139A1 - Head or foot adjusting jack, with several stepped engagement positions

Info

Publication number: WO1988009139A1
Application number: PCT/EP1988/000410
Authority: WO
Inventors: Kurt Ehrenberg
Original assignee: Lanz Industrie-Technik Ag
Priority date: 1987-05-19
Filing date: 1988-05-11
Publication date: 1988-12-01
Also published as: ES2031951T3; EP0291840A1; DE3716714C2; ATE75116T1; EP0291840B1; DE3716714A1; DD270003A5

Abstract

Head or foot adjusting jack (1) which can be reversed to an upper position, and in which are fixed on the parts of the frame (3, 4) bars (15) or supports (22) connected in an articulated manner. Between the two is arranged a toothed strut (29), the engagement end (30) of which protrudes through a longitudinal opening (18) arranged in the bar (15) on an engagement toothed rack (17). At the end of the rack (30) are provided several engagement teeth (31-34), of which at least two are engaged with the toothed rack (17) of the bar (15), in the stepped maximum-loading positions.

Description

Head or foot plate with multiple step clicks

The invention relates to a head or foot rest which can be reversed in an upper position and has a plurality of step catches for pivotable frame parts such as, for example, mattress frames, consisting of a C-rail articulated on the mattress frame by means of a fastening piece with a locking toothing, and one on the pivotable frame part by means of a fastening piece articulated support, a swivel joint for connecting the end of the support to the articulated end of the C-rail and a toothed strut articulated on the support, the latching end of which projects through a longitudinal opening in the C-rail onto the latching toothing and with an arrangement for detent-free return is combined in their starting position.

A backrest or headrest adjustment device for sitting and reclining chairs or the like has become known. Consisting of an articulated pair of levers, the angular position of which can be changed by a support lever engaging a toothing, devices being provided which bring about a free, non-invasive decline of the support lever from the highest position to the initial position. In this known adjusting device, the support lever is tooth-like. When the adjustable part is folded up, it falls into the teeth of the lower lever of the pair of levers due to its own weight. It is guided in a slot of the lower lever with cams, the upper one of which is displaced in the highest position of the supporting lever by means of a spring through a recess in the guide of the lower lever. It is ben that the support lever slides without engagement above the lower lever when the adjustable part is folded down, until a second recess in the guide of the lower lever after the adjustable part has been completely lowered allows the support lever to engage again automatically while the lower cam engages prevent the support lever from stepping out of its guide (DPS 585000).

The lower lever is box-shaped in this adjusting device and, on the side facing the adjustable part, has a longitudinal opening in which the support lever is guided, and through which its support end engages with a locking tooth with the toothing in the lever.

This known backrest and headrest adjusting device has disadvantages. The teeth of the toothing of the box-shaped lever, which come into engagement with the locking tooth of the support lever in each detent position, can only bear a small load. With continuous use, there is a risk that the latching ability of the ratchet tooth and toothing will wear out and, for example, no longer remain in engagement in the case of shock-like loads. In addition, despite the guidance of the support strut in the longitudinal slot of the lower box-shaped lever, only a very low lateral stability of the backrest or head part adjusting device is ensured. The upper lever of the adjusting device is only a simple sheet metal strip which is articulated to the lower box-shaped lever. It has further been found that in this known actuating device the device which causes the support lever to drop without engagement from the highest position to the initial position is susceptible to failure.

Also known is an adjusting device for head and foot part brackets on reclining furniture, which is fastened to the frame and to the head or foot part brackets in a known manner. It essentially consists of a guide bar which is box-shaped and is provided with a longitudinal opening, a locking strut which is articulated on an adjusting lever and a runner with a profile window, which is used to guide the locking end of the strut. This latching end is provided with a strut nose which engages in adjusting holes in the guide bar (DE-GM 5924799).

In this known adjusting device, too, the resilience when the strut nose cooperates with the plug-in holes is low due to a high specific surface pressure. In addition, there is also an extremely low side stability. For example, with this adjusting device, adjustable head or foot parts of mattresses for bed frames cannot be securely fixed in the long run. After a relatively short time, the connecting bearings of the adjusting device, which are exposed to lateral pressure, become loose and, as a result, also impair the latching ability between the strut nose and the adjusting holes of the guide strip.

In contrast, the present invention is based on the object of creating a head or foot plate for particularly high loads with good lateral stability, which is simple to manufacture and whose individual parts can be used equally well for various exemplary embodiments.

It has been found that this object can be achieved in a simple manner if a plurality of latching teeth are provided at the latching end of the toothed strut, of which at least two are engaged with the latching teeth of the C-rail in the step latches with the highest load. As a result, the specific surface pressure is reduced even under high loads. A head or foot switch according to the invention takes on loads which in the long run are far higher than the previously known designs of this size without difficulty. This is particularly advantageous in the lower adjustment ranges. In the upper position, the resistance to high loads is not so strong. Details of the heavy-duty locking teeth are the. Claims 2 to 6 can be seen. It is essential that the locking toothing of the C-rail includes locking surfaces arranged in parallel and that the locking teeth of the toothed strut are provided with corresponding locking surfaces, such that the locking surfaces of the locking toothing and the locking surfaces of the toothed strut are subjected to the highest load in each step locking rest the engaged teeth. The measures that must be taken in individual cases with the head or foot actuators according to the invention in order to achieve this depend on the pivoting radius of the locking joint by which the toothed strut is connected to the carrier.

In a preferred embodiment of the invention, the lateral stability of the head or foot actuator is achieved with a slightly designed frame in that the carrier consists of two side struts of a Y-carrier, the lower ends of which are articulated to the C-rail and articulated on the swivel joint are and their front ends - diverge - between the locking joint and the fastening piece. This divergence depends on which side stability is to be achieved. It is particularly advantageous that this design of the carrier, but also a simpler design, can be combined with the same C-rail. For both of the exemplary embodiments shown, the C-rail and toothed strut can be used unchanged.

To fasten the head or foot plate to the frame parts, fastening pieces with fastening plates and fastening angles are provided, which can be connected by pins to the associated pivot openings of the carrier or C-rail. A particularly simple manufacture results if pivot pins are pressed out or pulled out of the fastening angles. This design allows a releasable connection between the fasteners and the carriers or the C-rails. Without changing anything at the core of the invention, pivot pins can also be expressed from the front ends of the C-rails and supports are that can be flexibly and articulately connected to the mounting brackets or the pivot holes contained therein.

Further details of the invention emerge from claims 11 to 13.

Exemplary embodiments of the invention are described below with reference to the drawing.

It shows:

1 is a perspective schematic view of a head or foot plate in connection with a Rarimen, F Fiigg .. 2 2 a toothed strut,

2a a reversing slide,

3a the locking end of the toothed strut,

3b e different step detents of the toothed strut,

4 shows a first embodiment of the invention in side view,

5 is a plan view of the embodiment of FIG. 4,

6 shows a partial sectional view along the line VI / VI in FIG. 4, FIG. 7 FIG. 7 shows a schematic side view of a second exemplary embodiment of the invention,

7a shows a section through FIG. 7 along the line VIIa / VIIa,

Fig. 8 shows a construction detail, F Fiigg .. 9 9 schematically a locking joint and

Fig. 10 different mounting brackets.

1 shows a head or foot rest, generally designated 1, whose support 22, 24, 25 is articulated, for example, to a pivotable frame part 3 and its so-called C-rail 15 on the mattress frame 4. The C-rail 15 and the beams 22, 24, 25 are connected to one another in an articulated manner by means of a swivel joint 26. A toothed strut 29 is articulated on the supports 22, 24, 25 by means of a locking joint 43, the locking end 30 (FIGS. 2 and 3) of which extends through a longitudinal opening 18 in the C-rail 15 and in each step locking device 2 with locking teeth

17. is engaged at the bottom of the C-rail 15. The parts of the brackets 22, 24, 25 and the C-rail 15 connected to the swivel joint 26 are referred to as joint ends 23 and 16, respectively.

According to the invention, the latching end 30 of the toothed strut 29 has latching teeth 31, 32, 33 and 34, of which - particularly in the lower step latches 2 - at least two are in engagement with the latching toothing 17. 2 shows in particular that each locking tooth 31 to 34 has a locking surface 35 and a tip 36. These tips 36 are arranged in such a way that two adjacent tips 36 each lie in a functional level 37 of the first two locking teeth 31 and 32 in the first step locking 2 corresponding to the locking point A, parallel to the level 21 of the locking teeth 17 in the C Rail 15. The functional levels 38 and 39 of the second and third or third and fourth locking teeth 32, 33, 34 rise in this first step locking relative to the plane 21 of the locking teeth 17. In a first embodiment, in which the swivel radius 45 between the central axis of the locking joint 43 and the swivel joint 26 is, for example, 65 mm, the lengths are 1, 1, 1, 1 between the central axis of the swivel joint 26 and the tips 36 of the teeth 31, 32, 33, 34 for example 76.99 mm, 87.48 mm, 97.92 mm and 107.31 mm. Therefore, in the lower step detent 2, the plane 38 is inclined relative to the plane 21 of the detent toothing by the angle β = 8.28 ° and the plane 39 relative to the plane 21 is inclined by the angle ^ = 14.11 °. These inclinations will be designed differently with larger or smaller head or foot actuators with different pivot radii 45.

In the side view of a first embodiment shown in FIG. 4 it can be seen that the locking teeth 17 of the C-rail 15th consists of parallel latching surfaces 20, which are arranged obliquely to a plane 21. In each highly loaded step latching 2, the latching surfaces 35 of the latching teeth 31 to 34 involved now lie parallel to the latching surfaces 20 of the latching teeth 17. Since the latching surfaces 20 and 35 are in the step latches the specific surface pressure becomes low. In this way, the head or foot switch 1 according to the invention is able to absorb loads that are much higher than the previously known designs of this size.

This is particularly important in the lower rest positions. In the vertical position of the pivotable frame part 3, such a load need not be absorbed.

In the exemplary embodiment according to FIGS. 4 to 7, the C-rail 15 has ten locking surfaces 20, whereas the locking end 30 of the toothed strut 29 is provided with four locking surfaces 35. When pivoting the carrier 22 or 25 and 24 relative to the C-rail 15, the locking joint 43 describes an arc with the pivot radius 45 and the pivot joint 26. The essential step detents 2 are the locking points on the circular arc of the locking element steer 43 and labeled A ,, A ₂ , A ₃ and A. Depending on these latching points A. to A., the relative positions of the latching end 30 of the toothed strut 29 to the latching toothing 17 of the C-rail 15 are shown in FIGS. 3b-e.

According to FIG. 2b, the locking surfaces 35 of the locking teeth 31 and 32 rest against the locking surfaces 20 of the locking teeth 17 at the locking point A. In this position, function levels 37 and level 21 of the locking teeth 17 run parallel to one another.

3c shows the relative position of the locking teeth 17 and the locking end 30 at the locking point A _2. Here the locking surfaces 35 of the locking teeth 32 and 33 rest against the locking surfaces 20 of the locking teeth 17. The functional level 38 runs parallel to the plane 21 of the locking toothing 17. FIG. 3d shows the relative position of the locking teeth 17 and the locking end 3 at the locking point A ₃ , in which the locking surfaces 35 of the locking teeth 33 and 34 rest against the locking surfaces 20 of the locking teeth 17. The functional level 39 runs parallel to the level 21 of the locking teeth 17.

In Fig. 3e, finally, at the locking point A _4, only the locking surface 35 of the locking tooth 34 abuts against a locking toothing 20. In this position, the specific surface pressure is no longer as high.

In the embodiment shown in FIGS. 4 to 6, the carrier is formed in two parts. It consists of the two side struts 24, 25 of a Y-beam, which run parallel to the C-rail 15 between the swivel joint 26 and the locking joint 43. Their joint ends 16 to 23 are connected to the C-rail 15 by means of the swivel joint 26.

The ends running between the locking joint 43 and the fastening piece 5 diverge. This enables an extraordinary lateral stability of the head or foot switch 1, for example in connection with light frames 3, 4. Fig. 5 shows this training in plan view.

FIG. 6 shows a partial sectional view along the line VI / VI in FIG. 4 and clearly shows the diverging front ends of the side struts 24 and 25 of the Y-beam. 6 also shows the box-shaped structure of the C-rail 15, through whose longitudinal opening 18 the toothed strut 29 projects. This is articulated in a manner explained later by means of the locking joint 43 with the side struts 24 and 25 of the Y-beam.

To the left of the latching end 30 of the toothed strut 29, a reversing slide 19 can be seen, which is shown in a side view in FIG. 2a. It has a run-up curve 19a into which a guide pin 29a of the toothed strut 29 slides during the return, whereby the latching teeth 31 to 34 disengaged from the latching toothing 17 when the head or foot actuator 1 is returned to its rest position become. Two control slides 19 can be used to the right and left of the latching end 30.

7 and 7a show a second exemplary embodiment of the invention with the same C-rail 15. The locking teeth 17 and the plane of the locking teeth 21 are only indicated schematically. A U-shaped support 22 is articulated by means of the swivel joint 26 and, as can be seen in cross section in FIG. 7a, has a U-shaped cross section 28. In the idle state of the head or foot actuator, which is shown in FIG. 7a, the support lever 22 encloses the latching rail 15. The latching strut 29 articulated in the latching joint 43 by means of the joint pin 42 is only shown schematically as a line.

8 and 8a show connection options between the fastening angles 9 and the side struts 24 and 25 of the Y-beam. As illustrated, pivot pins 10 can be driven out of the fastening angles 9. The pivot openings 27 at the front ends of the side struts 24 and 25 can be inserted loosely from the inside onto the pivot pins 10 according to FIG. 8. However, as can be seen in FIG. 8a, they can also be riveted together. Without changing anything at the core of the invention, the pivot pins 10 can, however, also be expressed or driven out of the front ends of the side struts 24 or 25 of the Y-beam. The pivot openings 27 would then be provided in the mounting brackets 9.

A corresponding type of fastening can also be provided between the fastening pieces 6 with their fastening plates 8 and the corresponding parts of the head or foot plate 1.

Further fastening options are shown schematically in FIG. 10. It is thus possible to carry out the fastening by means of a spring clip 11, in which pivot openings 46 are provided which sit on the pivot pin 10. These can - as indicated - from the C-rail 15, but also from the side struts 24 and 25 of the Y-beam.

Another fastening option is provided, for example, by a pin 14. The pivot openings 46 can be inserted over the ends of the pin 14 which project outwards.

A spring clip 12 also has pivot openings 46 which can be plugged onto protruding ends of the pin 14 or onto the pivot pin 10.

A further fastening possibility results from a spring clip 13, the pivot openings 46 of which are plugged onto the inwardly directed pivot pin 10. On the upwardly facing surfaces of the spring clips 11 ^*, 12 and 13 holes are provided for screws, 11 are attached to the frame parts 3, 4 to 13 with which for example the Federklam¬ numbers. The advantage of the spring clips 11 to 13 shown in FIG. 10 is that the fastening pieces 5, 6 can only be inserted or hung in place during assembly.

A further simplification of the design of the head or foot switch 1 according to the invention is shown in FIG. 9. The locking joint 43 is shown there in the manner of an exploded drawing in the non-assembled state. A bore 44 is arranged in the toothed strut 29, into which a sleeve 40 is inserted, the ends 41 of which, in the assembled state, bear against the inner sides of the side struts 24 and 25 of the Y-beam. A connecting rivet 42 is inserted through the openings in these side struts 24, 25 and the sleeve 40 and, in the inserted state, is secured against lateral displacement. A particularly secure design of the locking joint 43 is obtained when the ends 41 of the sleeve 40 are compressed so that the latter is firmly connected to the toothed strut 29. li

List of terms used

1 head or foot plate

2 steps 3 swiveling frame part

4 mattress frames

5 fastening piece

6 mounting piece

7 mounting plate 8 mounting plate

9 mounting brackets

10 pivot pins

11 spring clip

12 spring clip 13 spring clip.

14 pin

15 C-rail

16 articulated end

17 locking teeth 18 longitudinal opening

19 reversing slide 9a run-up curve

20 resting area

21 level of the locking toothing 22 U-shaped carrier

23 joint end

24 side struts of the Y-beam

25 side struts of a Y-beam 26 swivel joint

27 swivel bore 28

29 Toothed brace 29a Guide pin

30 rest stops

31 ratchet tooth

32 locking tooth

33 locking tooth 34 locking tooth

35 resting area

36 top

37 Function level 1

38 Function level 2 39 Function level 3

40 sleeve

41 end

42 connecting rivet

43 locking joint 44 bore

45 swing radius

46 swivel opening

Claims

1. In an upper position reversible head or foot switch with several step detents for pivotable frame parts such as mattress frames, consisting of a C-rail articulated on the frame by means of a fastening piece with a locking toothing, a carrier articulated on the pivotable frame part by means of a fastening piece, one pivot joint for connecting the joint end of the support to the joint end of the C-rail and a hinged on the carrier gear strut, whose latching end projects through a longitudinal opening in the C-rail to the ratchet toothing ^'and a An¬ order to rest free return to their original Läge kom ¬ is biniert, characterized in that at the latching end (30) of the toothed strut (29) a plurality of latching teeth (31 to 34) are provided, of which at least two (31, 32; 32, 33; 33, 34) are engaged with the locking teeth (17) of the C-rail (15).

2. head or foot switch according to claim 1, characterized in that the locking teeth (17) of the C-rail (15) includes locking surfaces arranged in parallel (20), and that the locking teeth (31 to 34) of the toothed strut (29) are provided with corresponding latching surfaces (35) in such a way that the latching surfaces (20) of the latching toothing (17) and the latching surfaces (35) of the engaging therewith in each step latching (2) with maximum load the locking teeth (31 to 34) lie against each other.

3. head or foot plate according to claims 1 and 2 ^" , characterized in that the locking teeth (17) of the C-Schlene (15) ten locking surfaces (20) and the locking end (30) of the toothed strut (29) four locking surfaces (35 ) exhibit.

4. head or foot plate according to claims 1 to 3, characterized in that the locking teeth (31 to 34) of the locking strut (29) have tips (36), and that at least two neighboring tips (36) in each functional level (37, 38, 39).

5. head or foot switch according to claim 4, characterized in that in the first step detent (2) the functional level (37) of the first two locking teeth (31, 32) in sync and the functional levels (38, 39) of the second and third or of the third and fourth locking teeth (32, 33, 34) rising to the plane (21) of the locking teeth (17) are arranged in the C-rail (15).

6. head or foot switch according to claims 4 and 5, characterized in that in the second and third step locking (2), the functional levels (38, 39) of the second and third or third and fourth locking teeth (32, 33, 34 ) are arranged in the same direction relative to the plane (21) of the locking teeth (17).

7. head or foot plate according to claims 1 to 6, character- ized in that the carrier consists of two side struts (24, 25) of a Y-beam, the lower, parallel to the C-rail (15) ends at the swivel joint (26) are articulated and their front ends - between the latching joint (43) and the fastening piece (5) - diverge.

8. head or foot plate according to claims 1 to 6, characterized in that the carrier towards the C-rail (15) is open U-shaped support (22) which surrounds the C-rail (15) in the rest position.

9. head or foot plate according to claims 1 to 8, characterized ge indicates that the fastening pieces (5, 6) fastening plates (7, 8) with mounting brackets (9), and that from these - in the direction of the with swivel holes (27) on the ends of the side struts (24, 25) of the Y-beam - the pivot pins (10) are pulled out.

10. head or foot plate according to claim 8, characterized in that the pivot pin (10) and the pivot holes (27) are loosely connected.

11. head or foot plate according to claim 9, characterized in that the pivot pin (10) and the pivot holes (27) are riveted together.

12. Head or foot plate according to claims 1 to 11, characterized in that the latching joint (43) includes a sleeve (40) which is inserted through a bore (44) in the toothed strut (29) and is then exchanged on both sides, the ends (41) of which bear against the inner sides of the side struts (24, 25) of the Y-beam, and are firmly connected to one another by a connecting rivet (42) for the latching joint (43).

13. head or foot plate according to claims 1 to 12, characterized in that the fastening pieces (5, 6) Federklam¬ men (11 to 13) with pivot openings (46) which are detachable from the materials of the C-rail ( 15) or the side struts (24, 25) of the Y-beam driven pivot pin (10) or sit on correspondingly projecting ends of a pin (14).