DE7214720U - Backrest adjustment device, especially for office chairs - Google Patents

Description

PATENT Attorney DrPH.-ItVTG. GEFiD CTTERMANN 7i HEIUBRONN. KAISERSTRASSE 54. POST BOX 1U5

(NEW BUILDING HANDELSBANK. OKaENUBEH DER HARMONIK) ¹ O7I 31/8 2β Ζβ · TELEOR.I PATU · KONTENl HANDELSBANK HEtLBRONN AG. 23 ΟβΟ · POSTSCHECK STUTTGART 43Ο16

Utility model registration? 7. 22 D

April 11, 1972 / April 18 Ut / Xe

Applicant: August Fröscüer K.G.,

D-714-1 SteirJieim / Murr

BahrJao fstrasse 13 Post Office 20

Backrest adjustment, especially for office chairs

The invention relates to a backrest adjusting device, especially for office chairs with a continuously adjustable backrest attached to the seat, the Locking by plague clamps one axially displaceable Rod takes place.

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Office chairs and other chairs for workplaces, including in the Household, are today with many facilities equipped to ensure an anatomically correct posture while sitting depending on the job. This requires an adjustment of the backrest. This adjustment can be carried out both in height and in the direction of inclination of the backrest. The relative position in relation to the seat can also be changed depending on whether you are sitting back would like to use the phone, dictate or the like or write on the typewriter upright or at the desk You may sit bent over and write. ? ür Such adjustments have become known to the most varied of devices. There are different ones Solutions known in which the backrest is rigid on a column or with the help of rubber pads or springs or a alignment that is clamped with a clamping screw is attached. In some such backrest adjustments made in practice, the column is called axially displaceable rod fixed in a holder provided on the rear edge of the seat. This holder is designed in the manner of a clamp, which are compressed and released with the help of a toggle screw can, after a slight loosening, the rod can be moved in move in the axial direction and thus bring the backrest to the desired height. Then the screw screw dressed again. Kit of the same or a different toggle screw can also be used to incline the Change the backrest column and thus the backrest using a corresponding screw clamping device. All these Clamping devices only ensure a good hold then, if they work perfectly again after the change are attracted. In addition, the holder and affect

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Clamping screws make the chair look attractive, are susceptible to dirt and difficult to clean.

The invention is intended primarily to provide the aforementioned Disadvantages are avoided and, among other things, the advantages listed below are achieved. The invention has the task based on designing a backrest adjustment device of the type mentioned at the outset in such a way that it is released when it is released the handle automatically and correctly locks the backrest in the current position and the in ' direction easy to establish and secure in the puncture _ is as well as the attractive design of the chair and smooth lines not impaired. Inven- ' according to the provision it is provided that the rod penetrates two tilting elements on which at least one spring engages, which inclines the tilting elements in opposite directions and which can be swiveled against the spring action to release by means of a handle. The opposite arranged tilting elements lock the rod immediately when you let go of the handle due to the spring action and flawless in the current position. The rod is supported on opposite edges the tilting elements. Since two opposing tilting elements are arranged, the rod is also flawless fixed in both thrust directions. Such a locking device can with the simplest means built up and very well protected and accommodated in a way that is not disruptive. Wear and tear are automatically the same and it is avoided that the back when you let go of the device undesirably sags or by itself pivots too far forward or backward. The rod and the holes, which are slightly larger in diameter, are useful designed with a circular cross-section in the tilting elements.

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Then it is very easy to properly drill the appropriate holes and a good plague clamp is guaranteed. Even Installation errors do not have a detrimental effect on the puncture the end. The backrest adjustment device can be used both for height adjustment and for tilt adjustment a backrest can be used.

A backrest adjustment device that works particularly safely, is easy to manufacture and can be accommodated the invention provides that "the tilting elements are designed as angled rocker arms, the joints of which on the one side of the rod, while a tension spring is clamped between the ends on the other side of the rod is and engages a push button on the free, mutually facing legs of both angular pivot levers. Such an arrangement can be built particularly flat. The spring can be moved despite favorable leverage accommodate well. Despite the high spring force, only a small actuating force is required. The push button can be operated immediately without the need for complex lever constructions. Such a one The clamping element arrangement can work well in the backrest support column be arranged on which the backrest is mounted displaceably in height by a backrest slide holder penetrates a longitudinal slot and is attached to the upper end of the rod. The protrudes Then push button out of a suitable opening in the column. Otherwise, however, is of the backrest height adjustment nothing to see and the backrest support column remains in its relative position to the seat when the Backrest height adjustment is operated.

The backrest can be attached to a support column pivoted about a pivot point at the rear of the seat.

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The height adjustment can be easily accommodated in this support column, while the inclination adjustment with the same locking principle can be accommodated under the seat, which is less disruptive and not susceptible to dirt. For this purpose, the rod of the backrest adjustment device equipped with tilting elements engages the pivotable backrest support column, preferably below the articulation. With such a position, ^the return spring for the backrest and the one spring for the pivoting of the one tilting element can be combined very well by placing between the one tilting element and a stop on the rod, preferably the bearing eye for the articulated Connection to the backrest support column _} a compression spring is clamped surrounding the rod, _ which presses the backrest into the foremost position and the tilting element into the clamping position. The other clamping element is then acted upon by a further spring. · · ·

The tilting elements can be mounted tiltable in an embodiment other than the one mentioned above about the articulation axes lying on one side of the rod, and on the other side ^: the rod between the externally compressed tilting elements can be provided with a handle cam which the pushes apart free ends of the tilting elements when actuated. While in the first embodiment a high spring force could easily be overcome with a low actuation force due to the angled lever-like design, this embodiment provides for a reinforcement of the actuation force via a lever and a corresponding bearing and curve shape of the cams.

Further details, configurations, features and advantages

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Parts of the invention are to shorten the introduction to the description only dealt with in the following description and claims.

The invention is illustrated by means of the drawings using an exemplary embodiment of a chair with backrest height and backrest inclination adjustment explained in more detail.

Show it:

Pig. 1 shows a vertical section through a Stxihisitz no inclination adjustment the backrest support column and height adjustment device for the backrest, wherein Backrest and backrest: ragsäule are shown in the side view;

Pig. 2 shows a rear view of the chair part according to Pig. 1 with the backrest height adjustment Partly dashed shown; . . .

Pig. 3 shows an enlarged partial horizontal section longitudinally the line 3-3 in Pig. 2 through the backrest support column and the backrest slide holder;

Pig. 4 is an "enlarged partial section along FIG

Lines 4-4 in the Pig. 1 and 5, the clamping mechanism for stepless height adjustment - ■■ ■ of the backrest;

Pig. Figure 5 is a section along lines 5-5 of the pig. 1, 2, 4, 6 and 7;

Pig. 6 vain cut along line 6-6 in Pig. 4;

Pig. 7 is a section along lines 7-7 in the pig. 2, 4 and 5;

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Pig. 8 shows an enlarged illustration of the clamping device for the backrest angle adjustment according to Pig. 1 according to line 8-8 in Pig. 9;

Pig. 9 is a section along lines 9-9 in the pig. and 8 and

Pig. 10 a section along lines 10-10 in Pig · ..! .__ 8 and 9.

The figures show the seat 11 as well as of a chair 10 a profiled backrest 12. The seat and backrest as well as the seat frame are only partially shown. The seat frame has a column 13 'on which a support plate 14 is fastened in a height-adjustable manner in a manner not shown in detail. On the support plate H, the seat 11 is articulated at the front with the aid of bolts 15. Between support plate 14 and a holder 16 is provided with a seat inclination adjustment equipped with a large handwheel 17. The holder 16 carries behind the rear edge 18 of the seat 11 -in pivot bearing 19 for the backrest support column 20. You is mounted pivotably back and forth on the bearing 19 with the aid of the bolt 21, the axis of the bolt 21 runs horizontally.

The backrest support column 20 consists of a profile tube 22, the cross-sectional shape of which is made of Pig. 3 can be seen. A central slot 24 is provided on the side 23 facing the seat. In this is a backrest slide holder * 25, like from Pig. 3 can be seen, displaceably guided, in this backrest slide holder 25, the backrest 12 is attached, for example with screws.

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The upper end of the backrest support column is with a Stopper 26 closed. A round rod 27 protrudes from the backrest slide holder 25 into the - as shown in FIG. 1 can be seen - straight part of the backrest support column 20 downwards. It is on the holder 25 in the axial direction fixed immovably. The height adjustment clamping mechanism is roughly in the middle of the backrest support column appropriate. From the backrest support tube protrudes laterally only the push button 31 out. Otherwise the mechanism is fully protected and invisible housed in the column.

The height adjustment clamping mechanism 30 is shown in FIG. 4 " to 7 shown in detail on a scale of 2: 1. It has two "circuit boards" '32, which are secured with the help of spacer bolts 33 and bearing and spacer bolts 54 are connected to one another. Using the mounting holes .35 it is fastened in the backrest support column 20. Angle levers 36 can be pivoted on the spacer and bearing bolts 34 stored. The two angle levers have clamping arms 37 and actuating arms 38. They put together.die Clamping elements for the round rod 27. The clamping arms 37 have round bores 39 that have a diameter are slightly larger than the rod 27. A tension spring 4I is clamped between the ends of Klemmarme..37. she is b. strives to pull the clamping arms 37 against each other and thus to tilt the clamping elements about the axes 34, that the rod 27 is clamped between opposite edges of the bores 39. As the clamp arms 37 attached to the bearing eyes 42 of the angle lever, pivotable about the spacer and bearing bolts and, like can be seen from the drawing, '... arranged in opposite directions are, when a thrust force is applied in one of the

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both axial directions of the rod 27 each endeavor a clamping arm to incline more and thereby to a to lead even better clamping. The rod 27 is thus properly secured against axial displacement in every position. While the bearing bolts 34 are on one side of the rod 27, the spring 41 is on the other Side of the rod 27 arranged, so that a very compact, favorable force relationships having arrangement results. The two actuating arms 38 are approximately parallel

to the rod 27 and!. point __to "one another." Your 1 _1

The ends 44 have recesses 45 in the end faces which engage in a groove 46 of the push button 31. This is held loosely between the ends 44. He protrudes through a ' Opening 46a in the side wall 47 of the backrest support column 20. For assembly, it is bent from one plate Holding arms 48 fixed approximately in its position so that it can be properly inserted into the bore 46a can. The inclined design of the collar 49 delimiting the hat 46 ensures sufficient freedom of movement. If you press the push button 31 from the outside, you can do a lot because of the favorable leverage easily overcome the force of the spring '41, the arms 38 for example Press into the position running parallel to the rod 27 so that the bores 39 are aligned parallel to the rod 27 are and the rod 27 is thus freely movable. You can now move the backrest 12 up and down push. When the push button 31 is released, the pulls Spring 41, the clamping arms 37 together again, so that the rod 27 is immediately fixed properly. When adjusting the height the backrest only the rod 27 with the holder is moved up and down. However, it is located inside the Column 2Qi so that it cannot pollute itself and Impurities in the mechanism do not adhere to clothing

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the user can get. The slot only needs 24 " to be guided above the plat-ines 32. On the the rest of the column, the profile can be completely closed. The mechanism is extremely simple in structure, easy to manufacture and very reliable. When normal pinger strength is insufficient to press button 31 you can support yourself well with the rest of your fingers on the opposite side of the column and thereby easily apply the force required to release the clamping mechanism 30.

8 to 10 show the clamping mechanism 60 for the inclination adjustment because of the larger scale - about 1: 1 more precisely. The rod 61 is provided with a bearing eye 62 at its rear end. This is articulated a little below the bearing 19 in a slightly bent part 63 of the backrest support column 20 with the help of a Bolzens 64. The housing 65 of the clamping mechanism 60 is fastened with the help of a bearing plate 66 under the retaining plate H of the seat frame. In the housing 65, two Xippelemente 67 designed as blocks are mounted pivotably about bearing bolts 68. The axes of the bearing bolts 68 are horizontal and above the rod 61. The blocks 67 have through bores 70, which are stepped so that a Klemmabsohnitt 71 and a portion 72 not touching the rod 61 result ... This is a good clamping effect in The loosened position enables the rod to be moved properly. Between the rear clay block 67a and the bearing eye 62, the rod 61 is clamped around a compression spring J4. On the one hand, this presses the rear clamping block STa. in his., clamping position and on the other hand the backrest in the most forward inclined

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Location. Another compression spring 77 is clamped between the front clamping block 67b and a housing wall 76, which presses the clamping block 67b into its clamping position. Here, too, the rod 61 and the clamping parts 71 are the bores 70 round. Between the inner edges 78 of the clamping blocks 67 on those opposite the bolt 68 At corners on the other side of the clamping rod 61, a cam 80 is provided. This is on a shaft 81 attached, which leads through the housing wall 82 and carries the actuating lever 84 serving as a handle on the outside.

, Like Pig. 2 shows that the lever 84 is located a short distance below the seat 11 so that it can be easily grasped from the side. If it is pulled forward, the 'clamping blocks 67 are slightly inclined out of their clamping position around the bolts 68, so that the rod 61 can move freely. If no force now presses against the backrest 12, the spring 74 pushes the backrest into its foremost position. If you want a different backrest position, you only need to lean on the backrest 12 and push it backwards into the desired position. When the lever 84 is released, the clamping blocks 67 are then immediately inclined into their tilted clamping position and tension the rod 61 in both directions.

'bar firmly. A cross pin 86 prevents it from being pulled out completely the rod 61. This mechanism is also well protected so that it does not get dirty and any oil adhering to it does not contaminate the user's clothing. Because the lever 84 is long is formed, even relatively large spring forces can be overcome well, so. that here, too, a slight operation and yet safe puncture with a simple structure and inexpensive handling, a stepless adjustment is guaranteed.

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The invention is not limited precisely to the exemplary embodiment. In particular, at a position Lehnenhöhenver ~ of the invention when using the clamping mechanism may have a different recline position Ever be provided, and vice versa with the clamping mechanism NaOH, for backrest angle adjustment another backrest height adjustment. The tilting elements, spring arrangement and actuation for unlocking the mechanism can each be provided in the manner shown for the other mechanism or in a constructive modification of the arrangements ν for the position of the hinge points, length of the lever arms and the arrangement of the springs.

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Claims (13)

Protection claims 1. Backrest adjustment device, in particular for office chairs with a continuously adjustable backrest attached to the seat, locking by clamping an axially displaceable rod, characterized in that the rod (27, 61) penetrates two tilting elements (36, 67) comprising at least one spring (41, 74, 77) engages, the tipping elements (36, 37; 67) in opposite directions tends _v ..and welche..zum solving means of a handle (31, 84) are pivotable against the spring action. 2. backrest adjustment device according to claim 1, characterized characterized in that the rod (27, 61) and the slightly larger diameter holes (39, 71) of the Klemaielemente (36, 37; 67) Have circular cross-section. 3 backrest adjustment device according to claim 1 or 2, characterized in that the tilting elements (36) are designed as Y-angle levers, whose (relenke (34 »42) lie on one side of the rod (27), while between the ends (40) the clamping arms (37) on the other side of the •/H F 7. 2 D 15 11.4.72 Ut / Ke -H- Rod (27) a tension spring (41) is clamped. and on the free, mutually facing legs (38) a push button (31) engages both angle clamping levers (36). 4. Lehnenverstelleinrichxung according to claim 3, characterized in that the $ push button (31) with a ring embedded in it κ? ·· groove (46) in recesses (45) in the end faces of the i 'ends (44) of the actuating arms (38) of the angular swivel - lever (36) is held. l> 5. Backrest adjustment device according to one or more ; X of the preceding claims, characterized in that U indicates that the angular swivel ] ■ lever (36) in the manner of a lock between two Plat-inen (32) on spacer and bearing bolts (34); - are pivotably held and the rod {27) and the push button (31) between the plates (32) stick out. 6. backrest adjustment device according to one or more of the preceding claims, characterized in that that the clamping elements (30, ■ 36, 27) arranged in a backrest extension column (20) are, on which the backrest (12) is mounted displaceably in height by the backrest strap holder (25) penetrates a longitudinal slot (24) and \ is attached to the upper end of the rod (27), where ^ΐ - the push button (31) from a suitable opening (46a) the column (20, 22) protrudes. 7. Lehnenversxelieinrichtung according to one or more ./15 F 7.2 D 15 April 18, 1972 Ut / Ke of the other claims, characterized in that that the backrest (12) in a "known manner" at a rear of the seat around a hinge point pivotally mounted support column (20) is attached. 8. backrest adjustment device according to one or more of the other claims, characterized in that that on the pivotable backrest support column (20) the rod (61 ') one with tilting elements (67) equipped backrest inclination clamping device (60) engages. 9. backrest adjustment device according to one or more of the other claims, characterized geken nzeich, that between your a Kippklemmelement (67a) and a stop of the rod (61), preferably the bearing eye (62) for the articulated Connection to the backrest support column (20), a pressure " spring (74) is clamped surrounding the rod, which the backrest (12) in the foremost position and the one Tilting element (67a) presses into the clamping position. 10. Backrest adjustment device according to one or more of the other claims, characterized. geken that ias dr articulation (62, SA-) of the rod (61) facing away from the tilting element (67b) by a spring (77). is pressed into the clamping position, which is clamped between the tilting element (67b) and a stop (76) fixed to the housing and which surrounds the rod (61). 11. Lchnenverstelleinrichtung after one or more the other claims, thereby geken n- ./16 • ····· · 1 1 I I t I · · I ti (iii «I τ P 7. 2 D 15 ^{I! L} A 11.4.72 TJt / Ke ' - 16 - draws that the tilting elements (67) to on the one side of the rod (61) lying hinge axes (68) are tiltably mounted and on the other side of the Rod (61) between the externally located springs (74- »77) compressed tilting elements (67) a cam (80) connected to a handle (84) is provided which supports the free ends (78 ·) of the tilting elements (76) pushes apart when actuated. 12. iehnenverstelleinrichtung according to one or more of the other claims, characterized marked e i chne t that the tilting elements are designed as blocks (67), which in one corner on bolts (68) are pivotably mounted, which are fastened in the housing (65), and the cam (80) with an on Housing (65) mounted pivot lever (84) is connected. 13. backrest adjustment device according to claim 12, characterized characterized in that the housing (65) is fastened under the seat (11) and the pivot lever (84) horizontally under the seat (11) lies.