ES2205633T3 - SUPPORTS, ESPECIALLY FOR OFFICE CHAIRS AND ROTATING CHAIRS. - Google Patents

Abstract

The armrest consists of a lower part (10) and an upper part (20) and is joined to the chair with a carrying element (2, 3, 4). The lower part is provided with a longitudinal slot (14) accommodating a sliding element (15.1) in order to facilitate a back and forwards motion of the armrest. A second sliding element (15.2), held by a latch (18), can move along a slightly bow shaped opening (33) when the armrest is moved to the sides.

Description

Armrests, especially for office chairs and swivel chairs.

The invention relates to an armrest swivel for chairs or armchairs (see document US-A-564 1203).

Office or swivel chairs present frequently armrests arranged approximately at an angle straight with respect to the backrest, with a rear pole assigned to the backrest and an anterior pole, which are fixed with a support of the armrest in the seat frame. It is known to configure this type of armrests adjustable in height, so that the own user of the chair can adjust the height of the armrest With this, the horizontal plane cannot be regulated position of the armrests with respect to the back of the chair, whereby a fixed position of the armrest The change of position (almost conditioned by the changing positions of the arm with the hand with which you work to consequence of a continuous change from keyboard to mouse in a Workstation with computers) does not allow this provision. The technical problem of the invention is seen by perfecting a armrests of this type so that, avoiding these disadvantages, can be manufactured more easily and economically and can be used Safely.

This task is solved according to the invention. by the characteristics of the main claim; the dependent claims describe refinements advantageous and preferred embodiments.

The armrest is rotatably positioned in the horizontal plane on an upper end plate of the armrest support, said armrest being configured as a hollow body attached in shape drag from a bottom wrap with base plate and top wrap with padded support. To achieve this rotating capacity, in the hollow body is provided with a fixed frame element attached to the armrest support, with respect to which the armrest can turn. For this, the hole for the passage of the clamping means above through the insert plate is set as elongated curved hole, with a curvature corresponding to an arc circular with a center of the circle defined by the axis of the rear clamping means, so that the armrest can rotate around the rear clamping means at an angle, which is given by the length of the elongated curved hole and the separation of the anterior clamping means guided through the elongated hole of the other rear clamping means that determines the axis of rotation.

This allows for easy armrest rotation only by the movement of the arms: the arm that supports it simply drag with your movement without a force considerable. If desired, this movement can be hindered by a restraint or may (apart from final positions conditioned by the recess) be provided a fixation in one or several positions of rotation approximately in the central position of the armrest. The hitch points are formed by a hitch heel and hitch depressions that house the swivel armrest or its counterpart fixed to the frame presents the hitch heel to which it is assigned, as minimum, a hitch depression on the other side. Advantageously, means can be provided that neutralize the hitch or blockage, or at least reduce it.

In a first embodiment, in the inside the hollow armrest body, a closure is provided of fixation whose two ends, interacting with the means of anterior and posterior clamping, are under traction against the upper end plate of the armrest support, which is therefore fixed to the frame and rotated with respect to the hollow body of the armrests In a second embodiment, inside of the hollow body of the armrest a plate of support, which is attached to the lower envelope or to the Top wrap and moves with them.

As a means of fixing the turn can be provided a transverse slat, which interacts with a heel attached to the frame. With this, the locking clasp is fits above with a transverse ribbon provided on the face internal of the motherboard and, with this, it is pressed and deformed elastically Therefore, friction occurs, whose strength Counteract the unintended turn. The magnitude of the friction can be adjusted, by adapting the height position of the fastener with respect to the crossbar, in such a way that the desired turn is achieved with the expected force; is regulation can occur with the minimum expense through a washer incorporated between upper end plate and closure Fixing.

The crossbar is provided with at least the center with a corresponding unmolding element, preferably also outside the center with more elements corresponding demoulded, which achieves a hitch. Advantageously, the hitch points are configured in such a way. so that a small force is enough to disengage. Advantageously, the crossbar is provided on the face Inner bottom wrap while fixing closure Present the heel. With this, for example by raising the fixing closure or lowering the crossbar, a disengagement In addition to a release by elastic deformation of a heel or cross bar, a rotating or movable wedge that can be handled from outside, the which allows the decoupling or coupling of the lock or the release. Advantageously, a hitch slide is provided that can let go, which stands out with its armrest support and can be operated using the button drive Advantageously, the drive slide is configured and arranged in such a way that, at rest, it is locked in closed position, and unlock only in case of drive and then release the turn lock.

In the case of the second embodiment, the support plate provided inside the armrest is endowed with the crossbar, which interacts with a heel Which located in the frame. Advantageously, the heel is configured here as a hitch slide that can move mainly in vertical, inserted in the armrest support head, the drive button of this sliding below the upper end plate of the armrest In addition, if this hitch slide can also lean advantageously in your driving, a immobilization in the lower position in which the armrest to rotate.

Advantageously, the armrest can also move in the direction of its longitudinal extension. For this, the opening for the rear clamping means is configured like an elongated hole that extends in the direction longitudinal armrest. The elongated arch-shaped hole Circular of the recess for the anterior clamping means is configured as an approximately rectangular break whose depth in the direction of the longitudinal extension of the armrest corresponds to the measure of longitudinal displacement, and whose orthogonal width with respect to it limits the angle of rotation of the armrest. This configuration offers both media hold enough space to enable both turning and the offset, so that in the case of this configuration both movements are possible.

At least one return is planned for the return elastic return element between the hollow armrest body and the support plate, which keeps the armrest in position hooked. This elastic return element is provided, advantageously, in the area of the rear clamping means. I know prefer configured as an elastic suspension with an element elastic, for example a return spring.

In the case of an alternative way, it is provided on the inside of the lower envelope a plate of insert pressed against the base plate of the lower wrap with the fixing closure, said plate being able to move insertion with respect to the fixed insertion plate. In this regard, this is arranged in the hollow body of the armrest of such so that it can move in the longitudinal direction with respect to the support plate, the support plate being guided dragging at least in its edge areas between the upper and lower wrap. This allows a shift of the armrest in a direction that extends approximately in right angle to the backrest. To do this, the bottom wrap presents guiding media that interact with guiding media corresponding to the insert plate and which are configured advantageously as grooves and slats that engage each other by way slot / spring, not depending on which of the pieces presents the slot and which the ribbon as a spring.

This armrest fastened with the plate insert or support plate in the armrest support can move, therefore, in the direction of its extension and so you can take to a desired position. In order to determine the desired positions, a locking mechanism is provided that locks or enables this longitudinal displacement capability, which set the armrest in the position achieved. For it, preferably the front end of the support plate has a heel that interacts with the hitch depression provided in the Inner lower face of the upper armrest wrap. To disengage, the armrest is placed in such a way with respect to the support plate that can be tilted, by which one lifts the heel out of the hitch depression corresponding and thus the disengagement is carried out by means of a pressure with the arm that rested, so you don't need No additional changes.

The fixing means, which fix the position regulated, can be unlocked for a move to a new position. For this, means are advantageously provided. manually operable, for example clamping means, whose closing claws pressed by elastic force: or by previous elastic tension against a friction surface, prevent an unintended displacement. Another possibility offer hitching means in which a hitching heel is engaged in hook recesses provided for this purpose, the advantageously heel of a button, which is configured as a lever, whose lever arm represents the drive element that is operated against the elastic force or against previous elastic tension. Also, it doesn't matter if the lever is configured as a lever with one arm or two arms, both have corresponding lever arms. To the hooking a shift in stages is possible; means of fixing configured as fastening means allow a continuous displacement

For the displacement in height of this type of The armrest can be telescopically inserted into the armrest on the armrest frame and is equipped with hitch devices that interact so much with the frame of the armrest as with the armrest support (approximately according to DE 295 02 429). In the case of a form alternative is provided, for unlocking the displacement in height, a decoupling device with a control linkage with a cam, by which the slide can move from one  hitching position to a disengaged position, and with what control buttons / control rods are equipped with elastic return. A tension or compression spring is provided as a means of elastic return of this type; this spring it is housed in a groove in the armrest support and interacts with a control link provided on the support of the armrest At the upper end of the control linkage is find a button, whose drive the control linkage it moves in such a way that a regulation slide, which slides on a cam, with a hitch heel that engages in one of the hook openings provided in the holder of the armrest returns and thus the hitch is eliminated.

By removing the hitch, the support of the armrest can move in the armrest stile and the height of the armrest can be changed by pushing or pulling according to desires (which does not exclude displacement in height by known embodiments).

The armrest armrest configuration in two wraps allows a simple union: the wraps are equipped with corresponding flanges, which can be assembled in drag shape, ensuring its attachment means of hitching or threaded The cavity formed by this inside the armrest allows the accommodation of the parts that enable the turn and / or displacement. Advantageously, the bottom wrap and The upper ones are configured as molded plastic parts by injection, with the understanding that the other parts, such as the insert plate, the fastener, the support plate and / or the push button or the sliding slide can also be made as plastic parts.

The essence of the invention is explained in detail by the embodiments shown in Figures 1 to 11; In this regard, they show:

Figure 1, armrest (upper wrap removed, in the center in the back position);

Figure 2, armrest (upper wrap removed, rotated in the previous position);

Figure 3, armrest with individual parts in the manner of an exploded representation (view from above);

figure 4; armrests with individual parts in the manner of an exploded representation (view from down).

Figure 5, view of the armrest from the part internal;

Figure 6, view of the armrest from the part previous;

Figure 7, exploded representation of the armrest (view from below);

Figure 8: representation is exploded (view from above);

Figure 9: armrest section, position front armrest;

Figure 10, hitch device "displacement in height":

Figure 10a: hook engaged;

Figure 10b: disengaged hitch (section of 6a):

Figure 11: hitch device "lateral displacement",

Figure 11a: hook engaged;

Figure 11b: disengaged hitch (section of 11a):

The armrest according to the invention is composed of armrest 1 with a rear 6.1 pole facing the back of the chair or armchair and with a previous 6.2 pole returned from the backrest, which is fixed on a support 2 of the armrest, whose free face is inserted into a sleeve 4.1 of the frame of a frame 4 of the armrest and which in turn can be placed, by an extension arm 4.2 separated approximately at right angles (figure 10), in a lower frame of a swivel chair or similar not shown. The upper termination of this bracket 2 of the armrest forms the terminal plate 5 on which the armrests 1. The 15.1 and 15.2 clamping means (shown as screws) keep the armrest 1 in the holder 2 of the armrest; for this, its plate 13 base of the envelope 10 lower has an opening 14 in the area of the rear 6.1 pole and a recess arranged in the direction of pole 6.2 above separate from it, which (to enable rotation) forms as minimum one elongated hole 17 curved in the form of a circular arc. By therefore, the bottom wrap 10 can rotate about the axis of the 15.1 rear clamping means as an axis of rotation at an angle given by the length of the recess shown as hole 17 elongated and by the separation with respect to the axis of rotation.

The armrest 1 is joined by the envelope 10 bottom, on which a top wrap 20 is placed. The upper wrap 20 consists of a padded support 21 with a zone 22 of the edge, said flanged area forming a concavity in which a hook insert 25 is inserted. With this, the zone 22 of the flanged edge of the padded support 21 overlaps zone 26 of the flanged edge of part 25 of hitch insert. Also the bottom wrap has a zone 12 of the flanged edge and thus forms a shape with a concavity. Both zones 12 and 26 of the edge allow, interacting, a drag-shaped joint of the armrest 1 with a cavity, they have hooking means (approximately, as the Figure 9, housings 23 of the support latch tabs 21 padding and latch tabs 27 of piece 25 of hitch insertion that engage there), which, in interaction, they join both in a fixed way. The hooking means or threads, such as coupling screws 20, can also keep both wraps 10 and 20 attached to the armrest 1. The bottom wrap 10 is placed on the terminal plate 5 upper of armrest support 2 (only part shown upper with its two vertical struts 4 and crossbar 3 cross linking both); the bottom, not shown, is inserted and fixed in a known way with a stem in a corresponding accommodation in the lower frame of the chair.

In the case of the embodiment according to the Figures 1 to 4, in the armrest 1 is advantageously provided a fastener 18 fixedly arranged in relation to the frame by means 15.1 and 15.2 of rear and front fasteners, which overlap the insert plate 30. Means 15.1 and 15.2 clamps are screwed into sleeves on the upper face of the terminal plate 5; whose height is such that the closure 18 of fixing rests on the insert plate 30, which has a hole as a passage for the rear clamping means 15.1 and a elongated hole 33 curved for the middle 15.2 above. First It is located in the area of the opening 14 configured as a hole elongated, the last in the area of the recess 17, configured as a rectangle, on the base plate 13 of the bottom wrap 10, whereby the armrest, also with the insert plate 30 introduced, can rotate around the axis of rotation produced by means of the 15.1 support shaft. Parallel to this hole  33 elongated runs a cross bar 32 also arched on which the fastener 18 slides producing friction. Friction can be regulated in such a way that the force necessary for the turn corresponds to the needs. Advantageously, the cross bar 32 is provided with points of hitch (not indicated in detail), which interacts with a point 19 corresponding hitch provided under closure 18 of fixation.

For fastening and driving this plate 30 of insertion, this one presents elastic configured edges 31, which they are guided in slots 11 guide in the inner part of zones 12 of the beaded edge. Therefore, the insert plate 30 is placed inside the armrest 1 scrollable, being arranged elastic 31 edges in grooves 11 guide on the inside of the flanged edge areas 12 of the lower wrap 10 of the armrest 1. To take advantage also this possibility of displacement, the opening 14 in the base plate 13 of the bottom wrap 10 is configured as elongated hole, which takes into account that the length of displacement in the longitudinal direction of the armrest 1 corresponds at least to the length of the track displacement. Therefore, the recess 14 maintains approximately the shape of a rectangle that corresponds to means 15.2 of previous clamping introduced the space needed for a turn or a  displacement. In addition, this insert plate 30 has a number of hook openings 34 arranged spaced apart from each other, in which a heel 38 for engaging a button 35 is coupled planned to unlock. This button 35 with its axis 39 is coupled by articulation in such a way to the base plate 13 of the lower envelope 10 of the armrest 1 that the path is achieved necessary to disengage heel 38 from one of the hook openings 34. With a pressure on the surface 36 of the button, the release lever 37 with the heel 38 moves in such a way that the heel 38 of hitch comes out of those of the hook openings 34 of the insert plate 30 and releases So its displacement. This actuation of the button 35 is produces against elastic deformation of the shaft or housing of the shaft, this elastic deformation causes the return, which It is also understood to provide a separate return spring.

In the embodiment according to figures 5 a 9, the rear clamping means 15.1 also forms the swivel joint, which allows a rotation of the armrest 1 in the horizontal plane, which is conducted for it through a hole at the end of a pole-oriented support plate 40 6.1 later. The anterior clamping means 15.2 is conducted to the support plate 40 through an elongated hole 43 which, configured in the form of a circular arc, limits in the horizontal plane the angle of rotation of the armrest 1. The base plate 13 of the lower wrap 10 has corresponding openings through of which these two means 15.1 and 15.2 of subjection are conducted. In addition, the openings 14 or 17 form a hole for the medium 15.1 for subsequent fixation or an elongated arch-shaped hole circular for the middle 15.2 front fixing. Especially for jobs with computers, the rotation of the armrest 1 No hitch points have proven their effectiveness: they perform their movements. However, it is understood that in addition to the stops laterals that limit the angle of rotation can also be provided more attachment points for armrest fixation 1 with the preferred angle of rotation. The support plate 40, which is shorter than the internal length of the armrest cavity, features 40.1 edges folded out that are conducted with union in shape drag to the two areas of the edge of the cavity that They run longitudinally. Thus, the armrest 1 can move in the direction of its longitudinal extension with respect to the support plate (40) (fixed as for the frame). For the fixing the armrest 1 in the desired (longitudinal) position a hitch that is maneuverable is provided, in the case of this embodiment, around a horizontal axis with respect to the support plate 40 attached to the frame, by tilting the armrest 1 with lower wrap 10 and upper wrap 20. In addition, the fixation of the armrest 1 has sufficient play and this one inclines in the case of an elevation in the previous end. A hook heel 41 provided at the end assigned to the middle 15.2 anterior support, heel that interacts by engaging with hook openings 28 provided on the underside of the upper wrap 20, rises out of these, removing the hitch in the direction of longitudinal movement. These hitch openings 28 are arranged in a row that is drawn on the outer face of the upper wrap 20 by means of a protruding slat 27 which is incorporated in shape drag in the depressed housing 23 of the hitch. The tabs 46 elastic provided at the end of the plate 40 of the support assigned to pole 6.1 later cause a counter-restraint, resting these tabs on the inner face of the plate 13 base.

To enable this displacement, on the plate 13 base of the lower envelope 10 the opening 14 is configured for the 15.1 rear clamping means in the 6.1 pole area posterior as an elongated hole that runs in the direction of the longitudinal extension of the armrest 1. Something similar serves to the opening 17, whose elongated hole in the form of a circular arc to enable the movement movement now forms a approximately rectangular recess. If the armrest 1 with the Polo 6.2 above rises slightly, if heel 41 hitch leaves the corresponding hook openings 28, allows a movement of the armrest 1 with respect to the plate 40 support. In addition, the configuration of openings 14 or 17 for both fixed means 15.1 and 15.2 with respect to frame allows, regardless of longitudinal displacement, a rotation of the armrest around a vertical axis.

Figures 10 show an embodiment of the displacement in height for the armrest: here, the frame 4 of the armrest and support 2 of the armrest are equipped with means for fixing a position of regulated height, which They are shown here as hooking means. In frame 4 of armrests are provided 4.3 hitch openings and in the armrest a control linkage 8 that can be operated with a button 9, linkage that has a cam 8.1 that interacts with a sliding slider 8.2 arranged transversely, guided in a guide opening 2.2 in the armrest support 2. The linkage 8 is operated by means of button 9 provided under the armrest 1: if it is pressed inwards, the control linkage 8. Sliding hitch slider 8.2 on cam 8.1 it goes back (according to the shape of the curve) and leaves the corresponding hook openings 4.3, the fixing hitch. A return spring 8.3 placed in a spring groove 2.3 (shown here as tension spring in thread-shaped spiral, which is fixed with one end in the control linkage 8 and with the other end on the inside of a spring slot 2.3 housing spring 8.3 return) press the control linkage 8 always in the rest position and the slide  8.2 in hitch position, so that the armrest is fixed in terms of height. In addition, the release button 9 It is located on the underside of the armrest 1, so that a grip that interrupts work is suppressed. For limitation of the mobility in height a closure is foreseen, formed by a 4.4 locking pin guided through a 2.6 locking slot (Figures 8, 9, 10).

Figures 11 show means for fixing of the lateral turn: a slide 48 uncoupling of hitch protrudes, with a 48.1 operating button, out of bracket 2 of the armrest, presented this support in turn a recess 2.4 in the form of a slit and leaning against it the slide 48 of hitch by means of a spring 49. The drive button 48.1 is endowed at its upper end with a heel 48.2 upper, which causes a hitch and therefore a turn lock interacting with depressions 43.2 of the 43.1 bar of hitch. In addition, a spring 49 presses the sliding slide 48 against the strip 43.1 of hook the support plate 40 and falls when turning on one of the depressions 43.2, whereby another rotation of the armrest is blocked 1. A protrusion 48.3 between the drive button 48.1 and the heel 48.2 above are configured in such a way that interacting with a chant 2.5 of the recess 2.4 fits this one below and thus the Sliding hitch 48 stays in position "unlocked." With a pressure on button 48.1 of drive, this projection 48.2 is pressed backwards and by both the sliding hitch 48 is released, which can now press spring 49 up. The upper heel 48.2 of the Sliding hook 48 then hits the lath 43.1 of hook arranged on the underside of the support plate 40 and, with the rotation of the armrest 1, it falls under the effect of spring 49 in one of the depressions 43.2 provided, so that the armrest 1 is fixed in the corresponding position. Even if itself, any turning position can be set, it has been shown in practice, that the central position is a position that prefers for fixing. For unlocking it is enough press the button 48.1 with a pressure in the zone of the overhang 48.3. The arc of the drive button 48.1 is takes care that it goes back in such a way that the projection 48.3 is re-engage underneath the edge 2.5 of the recess 2.4 and hold the sliding slide 48 fixedly in position "unlocked."

Claims (14)

1. Armrests for chairs or armchairs, which is fixed with a frame (2) of the armrest in the frame of the chair seat with a support (4) of the armrest with a plate (5) upper terminal oriented approximately at an angle straight with respect to a backrest, with a rear pole (6.1) oriented to this one and a previous pole (6.2) returned with respect to this one, as well as with an armrest (1) that can be placed on the terminal plate (5), the armrest (1) being configured as a hollow body drag-attached compound from a wrapper (20) upper with pad (21) armrests and a wrap (10) bottom with a base plate (13), in which a plate (30; 40) of Insert or support, which can be attached with the terminal plate (5) superior by means of a first and second means (15.1, 15.2) of clamping, is arranged in such a way that the hollow body can rotate at least with respect to this insert plate (30; 40) or support, the first fastening means (15.1) being guided through an opening (14) in the base plate (13) in the pole area (6.1) posterior and the second means (15.2) of clamping, arranged in direction to the previous pole (6.2) separated from it, by means of a recess (17), the recess (17) being configured as elongated hole to limit at least the angle of rotation, the which is curved in a circular arc with a radius of curvature corresponding to the separation of the media (15.1, 15.2) clamping. 2. Armrest according to claim 1, characterized in that the insertion or support plate (30; 40) disposed in the lower envelope (10) of the armrest (1) is fixed by means of a fastener closure (18) fixed by means ( 15.1, 15.2) of fixation, said closure being conducted by a curved transverse slat (32) in the form of a circular arc that runs approximately parallel to the elongated curved hole and being elastically prestressed in such a way that, this closure interacts with the slat (32 ) transversal as a means to fix holding and / or hooking. 3. Armrest according to claim 1, characterized in that the insertion or support plate (30; 40), arranged in the lower envelope (10) of the armrest (1), has on its lower face a latch (43.1) of engagement with at least one depression (43.2) corresponding to the point of the additional fixation interacting said slat, holding and / or engaging, with a heel (48.2) of a sliding slide (48) as a means for fixing a turning position. 4. Armrest according to claim 2 or 3, characterized in that the latch or cross bar (32; 43.1), as a means for fixing another turning position, has at least one center point at the center, which interacts with a corresponding hitch point in the fastener (18) or in the hitch slide (48), these hitch points being preferably configured as heels (19; 48.2) of hitch. 5. Armrest according to claim 2, 3 or 4, characterized by a sliding slide (48) that penetrates the lower shell (10) with a concave-shaped button (48.1) in the form of a trough as a means to release the fastener, being able to actuate said slide in its base plate (13) with previous elastic tension or with a previous tension by means of a spring (49) to release the fastener against this previous tension and presenting a heel (48.2) at its upper end, which interacts with the slat (43.1) of hitch arranged on the underside of the support plate (40). 6. Armrest according to claim 5, characterized in that the hitch slide (48) has a projection (48.3), between the operating button (48.1) and the upper heel (48.2), in the passageway through a recess (2.4) in the frame (2) of the armrest, said projection keeping the sliding slide (48) in the "unlocked" position interacting with a edge (2.5) of the recess (2.4) of the frame (2) of the armrest, and releasing it by pressing back. Armrest according to one of claims 1 to 6, characterized in that the armrest (1) can move longitudinally with respect to the insert or support plate (30; 40) fixed in the terminal plate (5) of the support (4) of the armrests and because, a hook mechanism is foreseen that makes this longitudinal movement impossible or possible. 8. Armrest according to claim 7, characterized in that for the longitudinal displacement of the armrest (1) with respect to the insert or support plate (30; 40), it is guided by guides (11) provided in the envelope (10; 20) lower or upper or by longitudinal edges (40.1) bent outwards, in or on these, the opening (14) being configured in the base plate (13) in the area of the first fastening means (15.1) as an elongated hole which extends in the longitudinal direction of the armrest, and the recess (17) being configured in the area of the second fastening means (15.2) as an approximately orthogonal recess corresponding to the angle of rotation and the depth of movement. 9. Armrest according to claim 7 or 8, characterized in that the engagement mechanism is formed by a push-button rotatably positioned on the base plate (13), the free end of this push-button being provided with a engagement bead (38), which, interacting with a number of hook openings (34) in the insert plate (30), allows blocking or unlocking of the adjustable longitudinal movement of the armrest (1), and the push button can be operated for longitudinal displacement against a tension elastic before or against a previous tension of the spring. 10. Armrest according to claim 7 or 8, characterized in that the coupling mechanism is formed by a heel (41) provided on the support plate (40) which, interacting with a number of attachment points (28) in the inner lower face of the upper wrap (20), allows a blockage or unblocking of the longitudinal displacement of the armrest (1), whereby the armrest (1) is reclining in relation to the support plate (40) of such so that, in case of an inclination of the armrest (1), the hook heel (41) unlocks the longitudinal displacement leaving the hook opening (20.2) of the upper shell (20). 11. Armrest according to claim 10, characterized in that between the hollow body of the armrest (1) and the support plate (40) in the area of the fastening means (15.1; 15.2) assigned to the rear pole (6.1) is provided, as minimum, an elastic support for keeping the armrest in the engaged position, preferably being provided as an elastic support a tongue (46) molded in the support plate (40) or a height compensation provided under the support plate (40) with an element elastic, for example, a spring. 12. Armrest according to one of the preceding claims 1 to 11, wherein the armrest support is height-adjustable guided in the frame sleeve (2) of the armrest fixed in the seat frame, characterized in that, for the regulation of the height, the sleeves (4.1) of the frame (4) of the armrest and of the support (2) of the armrest inserted in it are equipped with a hooking device that interacts with both, which presents, for unlocking the displacement in height, a decoupling device with a control linkage (8), which has a cam (8.1) that interacts with a sliding slide (8.2) located transversely by means of which the sliding slide (8.2) can move from a hooking position to a disengaging position, and with which the control / linkage button (8, 9) has an elastic return means (8.3), for returning to the engaged position. 13. Armrest according to claim 12, characterized in that a tension spring or a pressure spring is provided as elastic return means (8.3) which, placed in a spring groove (2.3) in the support (2) of the armrest, interacts with the control linkage (8). 14. Armrest according to one of claims 1 to 13, characterized in that at least the insert plate (30) or the support plate (40) are configured as parts next to the lower envelope (10) and the upper envelope (20). of plastic preferably manufactured by the injection molding process.