ES2253475T3 - MECHANISM OF ADJUSTMENT, ESPECIALLY FOR THE REST-ARMS OF A FURNITURE TO SIT. - Google Patents

Abstract

The adjustment mechanism, in particular, for stepwise adjustment of an arm rest of a seat relative to the seat base comprises a sleeve (13) which is attached to the arm rest, and slides over a tubular member (17.1) attached to the seat base. The tubular member accommodates an assembly of adjustment elements including an adjustment strut (25) and a stop system.

Description

Adjustment mechanism, especially for the armrest of a piece of furniture to sit on.

The invention relates to an adjustment mechanism for a piece to be adjusted with respect to a structure that it is equipped with a housing sleeve that joins the piece which will be adjusted, said sleeve being able to be adjusted accommodation with respect to it hooking over an extension fixed to the structure, a retention mechanism being provided for gradual adjustment; also refers to a armrest for a seating unit that is arranged on a support of an armrest and that can be fixed to the seat or to the seat support with a tongue of fixation that runs essentially horizontally, and which has an extension that extends fundamentally vertical, hooking over this extension a housing sleeve, on which it is arranged the armrest, especially with arm padding, and the armrest can be adjusted gradually with respect to the prolongation through a mechanical retention system.

Different systems are known for adjustment mechanics in which gradual adjustment is achieved with a system of retention that, however, must be structurally adapted to the corresponding particularities. It is not possible without more a Universal use of this type of mechanical adjustment systems. By both, for example, the armrests, known in themselves, for armchairs and chairs, especially for chairs swivel, which are attached to the chair seat support through a support of the armrest, are fundamentally separated horizontally from the backrest. At armrest support is provided on armrest with an arm support whose upper side is usually padded to provide the bottom of the arm more comfortable support. In this regard, the support of armrest can be configured so corresponding to document DE 201 08 247, so that the Armrest can be adjusted in height. Starting from document DE 295 02 429 a height-adjustable armrest which presents a mechanical adjustment system, arranged in a nerve of union, that extends between two supports that form the supports of the armrest. With this mechanical system of setting this embodiment is limited to an arrangement of this type, it is expensive to manufacture, therefore it cannot be used versatile way and cannot adapt to different particularities

With this invention a system should be proposed mechanical adjustment for gradual adjustment, especially for a gradual adjustment in armrest height for seating furniture that can be used versatilely and can easily adapt to different characteristics, which can be manufactured economically and can be used in a way sure, especially a armrest equipped with a mechanical system of adjustment of this type. This problem is solved thanks to the significant characteristics of the main claim; the dependent claims describe advantageous variants and preferred embodiments.

For this adjustment mechanism the extension It is configured at least partially as a tube. In this tube or in this piece of tube is introduced, mainly in drag of form, and an adjustment cartridge is attached to it attached to the structure with hollow interior space. For the drag-on joint desired, in an advantageous configuration can be placed ribs and / or strips on the outer side of the adjustment cartridge or its covers; this configuration guarantees, on the one hand, the crawling union, however, allows, on the other hand, considerable material savings that allow manufacturing economical The hollow interior space of the adjustment cartridge houses by dragging an adjustment blade together with the part that will be adjusted, so that it can move with respect to the adjustment cartridge The mechanical retention system intended for the gradual adjustment is arranged inside the adjustment cartridge and, being incorporated in the adjustment cartridge, it is housed by it In its whole. The adjustment cartridge is fixed in the part bottom and in turn is provided with a hollow interior space in the that the adjustment blade attached to the object is inserted, by example, the armrest of a piece of furniture for sit down, which will adjust with respect to the bottom.

In a first embodiment, the adjustment cartridge is configured in one piece. The pre-mounted adjustment blade is inserted into the hollow interior space and fixed with a locking block inserted. In another embodiment, the adjustment cartridge is configured as an insert with two covers. In this case, the adjustment cartridge or one of its covers, the retention cover, has on the inside side short transversal grooves separated from each other as retention depressions, which act together with the locking body of the mechanical retention system so that the adjustment of the adjustment blade in the adjustment cartridge is locked so that it cannot be released and unlocked so that it is released, so that adjustment is then possible. Deactivated, the locking body engages in one of the short transverse grooves that form the retention openings in the one-piece adjustment cartridge or on the inner side of the retention cover and thus blocks an adjustment. When the release button is operated, the release rod is moved, the locking body is carried out of the retention opening by the inclined guide and the blockage between the adjustment cartridge and the cutting blade is removed.
adjustment.

In this regard, the adjustment blade has at its free end a fixing plate for fixing to the piece to be adjusted, to which an insert is attached with a guide groove and a release rod driven there. In the upper end of the adjustment blade the free end of this release rod is driven out and provided with a release button with which the rod can move coupled release to unlock the mechanical system of retention for adjustment. The adjustment cartridge that houses the mechanical retention system is therefore a guide for the adjustment blade that is inserted there, which, in turn, contains and guides the release rod of the mechanical system of retention.

Therefore, the mechanical retention system is arranged exclusively in the adjustment cartridge and acts together with the adjustment blade. You can adapt your geometry in a simple way to the geometry of any tubular extension. This adaptation can take place directly or through a adaptive insert whose internal cross section corresponds to the adjustment cartridge and its outer cross section corresponds to the internal cross section of the extension tubular. Since the mechanical system retention system mechanical adjustment is arranged entirely inside the adjustment cartridge, the adjustment cartridge can adapt to virtually any form of cross section of a tubular or sleeve-shaped extension, so that this arrangement can be used in a wide range. Since the cartridge of adjustment houses the mechanical retention system so that the guides and retention openings are arranged exclusively Inside the adjustment cartridge, dirt risks are eliminated. Retention openings or retention depressions are arranged inside the adjustment cartridge, they cannot be accessed from the outside, the risks of crushing are eliminated.

In an advantageous variant it is planned configure the cartridge with a circular cross section, so  which can also be turned in the tubular extension. For determine the area of rotation and for the gradual rotation a mechanical locking or retention system, a heel in the most case simple, which acts together with retention depressions. From advantageously, the mechanical retention system is formed by a elastic retention heel and retention grooves arranged corresponding form to this one that are provided on the wall inside the tubular extension and next to the outer wall of the adjustment cartridge

In a preferred embodiment, the adjustment mechanism is used for height adjustment of a armrest of a piece of furniture to sit on. In this case, the furniture to sit has a support of the armrest fixedly fixed to the structure to the seat or seat support of the lower structure by a fixing tab that runs essentially horizontal, said support of the armrest in a tubular extension that extends primarily vertically. This extension is hooked over by a housing sleeve attached to the armrest with padded arm. In the tubular extension the adjustment cartridge is arranged with the adjustment blade. He adjustment cartridge is attached, for example, with a bolt, with the bottom and tongue of the seat support and blade adjustment is attached with the armrest in such a way that the mechanical retention system is disposed between the housing and the extension and thus blocks a vertical adjustment of the armrest without release. In a variant, the armrest is configured so that other possibilities of adjust, for example, in width or depth or its position angular.

For the release, the mechanical system of retention is unlocked by means of a rod with button and body of blocking, so that blocking is removed. To do this, in this configuration the release button is driven at the end upper release rod of the mechanical system of retention outside the lower armrest. This allows that the person who sits down can simply press the release and thus modify the height adjustment of the armrest In this regard, in this configuration only smooth surfaces appear outside, suppressing the risks of crushing for users due to the retention openings that remain free.

For economic manufacturing, at least the mechanical retention system is configured as a piece of cast iron injected. It is also advantageous configure the adjustment cartridge in one piece or with two covers, with the two covers, the pulsation cover and the cover of retention, such as injected plastic castings. In other configuration, the adjustment blade with the insert and the release rod with release button are set as pieces by cast iron injected. In this way some or all parts of the economic adjustment mechanism as castings plastic injected, advantageously using plastics of a polyamide base.

For the treatment of the plastic surface visible, especially from the surface of the housing sleeve,  a powder coating can be provided. To do this, it adjusts from correspondingly the electrical conduction capacity of the lining necessary for the evacuation of loads electrostatics by adding carbon fibers and / or groups of steel fibers. Advantageously, the ability to drive electrical is positioned such that the specific resistance is places below 10 5 \ Omegacm. This evacuation of charges are especially advantageous when, for example, it must be treated With electronic components.

The idea of the invention is explained in detail by means of the embodiments of the adjustment mechanism shown in figures 1 to 15 and referred to a armrest for furniture to sit on; to this respect show:

Figure 1, an armrest, a two-deck adjustment cartridge in exploded representation with individual pieces separated from each other;

Figure 2, an armrest, one-piece adjustment cartridge in exploded representation with individual pieces separated from each other;

figure 3; an armrest according to figure 1; Figure 3a, side view; figure 3b, view frontal;

Figure 4, an armrest according to figure 3 sectioned; Figure 4a, longitudinal section K - K partially sectioned; Figure 4b, longitudinal section J-J partially sectioned;

Figure 5, a mechanical retention system with detail B in enlarged form (section A-A, figure 3a); Figure 5a, adjustment locked; figure 5b, fit unlocked

Figure 6, an armrest according to figure 1 in cross section; figure 6a, section D-D (figure 2a), figure 6b, section C-C (Figure 2a);

Figure 7, two-deck adjustment cartridge; Figure 7a, view of the side of the guide cover; figure 7b, view of the side of the retention cover; Figure 7c, section corresponding to section E-E; figure 7a;

Figure 8, two-deck adjustment cartridge, with adjustment and release blade, shown separately;

Figure 9, one piece adjustment cartridge, shown with adjustment and release blade; Figure 9a, section corresponding to A-A of Figure 3a; figure 9b, section corresponding to figure 9a, although offset;

Figure 10, armrest with rotary adjustment cartridge in housing sleeve (view without armrests);

Figure 11, detail of armrest corresponding to figure 10; the Figure 11a, section F-F of Figure 10; the figure 11b, section G-G of Figure 11a;

Figure 12, lower part of the armrest with gradual adjustment;

Figure 13, section corresponding to the line of section H-H of Figure 12;

Figure 14, lower part of the armrest corresponding to figure 13, although with width adjustment; (section H-H, figure 12);

Figure 15, lower part of the armrest with width adjustment (section I-I of the figure 12).

The armrest 10 is composed of an armrest 11 which, if necessary, is equipped with a padding for Improve arm placement. This armrest is placed with its lower part 12 on a housing sleeve 14 and is firmly attached to it. In this housing sleeve enter the extension 17.1 of the lower part 17 which is fixedly attached to the lower structure of the chair by means of a sleeve 18 (or with the bottom 17 'screwable (figures 2, 9). The housing sleeve 14 slides during an adjustment on the bottom part 17 up and down. Cuff 14 housing is provided at its lower end with a piece 15 closure insert with inner 15.1 tabs elastic that support the housing 14 against the part 17 lower and, thus, enable a large-scale movement without slack, which can also be configured as tabs 15.2 high elastic and may be equipped with heels of retention. In another embodiment an inner ring 16 is provided of subjection that allows an adjustment fundamentally without slack and With little friction.

In extension 17.1 configured in a way Tubular is introduced, in a first embodiment, a two-deck adjustment cartridge 20 whose lower end, configured as fixing eyelet 23, it is fixed in a resistant way with extension 17.1 by means of a fixing bolt 19. In this case, one of the covers is configured as cover 21 of pulsation and the other cover, as retention cover 22. Together,  an interior space is produced inside the two decks into which an adjustment blade 30 is inserted.

In a second embodiment, it is introduced in tubular extension 17.1 a cartridge 25 adjusting a piece whose lower end with a fixing bolt 19 led to through bushing 28 is connected with extension 17.1. This Adjustment cartridge 25 is formed in the selected representation of Figure 2 by outer rings 26.1, a lattice of rings 26.1 exterior and ribs 26.2 exterior, so that it forms a cage structure, which, however, does not exclude other embodiments. One piece adjustment cartridge 25 it also has a hollow interior space in which it is introduced the adjustment blade 30.

The adjustment blade 30 is formed by one piece 32 inserted at whose upper end a plate 31 of fixing with which the adjustment blade 30 is connected to the part 12 lower armrest 11. This fixing plate 31 is provided advantageously of a recess 39 to accommodate the end upper release 40 (later explained more detailed). The lower end of this insert 32 is provided with a window 34 that extends at right angles to the part 32 inserted, said window being destined to the system retention mechanic This one piece adjustment cartridge 25 or this adjustment cartridge 20 formed by two covers, one cover 21 of pulsation and a cover 22 of retention, contains all the mechanical retention system necessary for gradual adjustment. In the case of the configuration of a piece is advantageous that a lock block 27 inserted secure adjustment blade 30 introduced against an extraction in the same way as the stops 22.1 provided on the inner side of the retention cover 22 of the embodiment of two decks.

For retention, the adjustment cartridge 25 of One piece or two-deck adjustment cartridge 20 features retention points and corresponding guides on the inner side. In In the case of the one-piece adjustment cartridge, the walls have interruptions formed by the intermediate spaces of the rings 26.1 exterior, said interruptions forming openings 29 of retention. To do this, at least in the adjustment zone are selected the separations of the outer rings, for example, by corresponding reinforcements, as can be seen in the figure 9b, so that they can comfortably accommodate (almost) the body 45 of mechanical retention system lock. In the case of the cartridge 20 adjustment of two covers, the pulsation cover 21 is provided with a continuous longitudinal groove 21.1 and the cover 22 of retention is provided with transverse grooves 24 that serve the lock body 45 as retention points. In this case, during manufacturing the wall side of the retention cover 22 which it must be provided with transverse grooves 24 freely available, so that here also an economic manufacturing of the two covers in the technique of injection molded molding. In in the case of the embodiment of a piece, the 26.1 outer rings and 26.2 outer ribs by a corresponding tool configuration. Configured in this way, the one-piece adjustment cartridge, like the of two covers, can be manufactured simply and economically with the technique of injection molding.

The mechanical retention system intended for the Gradual adjustment is released by a rod 40. This is formed by a release rod 42 whose upper end is arranged a release button 41. This release rod 42 it is conducted in a guide groove 33 of the insert 32. The lower end of the release rod 42 has a recess configured as guide 43 inclined with a chamfer transverse to the retention cover 22. In this recess is placed a locking body 45 that can move over the guide chamfer 43 inclined from the retaining opening, or either from the interruption of the one-piece adjustment cartridge 25 or from the retention cover 22 of the two adjustment cartridge 20 covers, if the release rod 42 is pushed by the 41 release button.

In this case, the locking body 45 protrudes laterally on the inclined guide 43 and arranged with its parts 45.1 protruding in window 34. In case of a drive the release thus moves the locking body 45, in action joint of inclined guide 43 and window 34, necessarily in a direction at right angles to the adjustment blade 30. In this way the blocking body 45 can act together with the transverse grooves 24 inside the cover 22 of retention and, thus, be introduced for blocking in one of the retention openings, the transverse grooves 24 or the retention openings 29, or removed from them for unlock

In the resting position, the rod of the adjustment mechanism is held by a spring 46 arranged between  the release rod 42 and the insert 32; for that, the inserted piece 32 presents a heel as support 32.1 for the spring 46 and release rod 42, a heel 42.1 housing one of the ends of the spring 46. With the release rod 42 held, the locking body 45 is pressed by the guide 43 leaning against the inner walls of the blade 20 or 25 of adjustment and hooks on one of the retention points, openings 29 retention or transverse slots 24, so that as as a consequence of this hitch a displacement of the armrest 11 in the height direction. If the rod is pushed  42 of releasing the adjustment device by means of button 41 of release, the guide 43 inclined relative to the body 45 moves lock, and lift it out of the retention point correspondingly, the retention opening 29 or the slots 24 transversal, so that you can now move the armrest

Advantageously, the tubular extension 17.1 and the adjustment cartridge 25 is provided with a cross section matching circle. Therefore, a rotation of the cartridge 25 is possible adjustment within the extension 17.1, and, given that the armrest 11 with padding 12 is fixedly attached to the blade 30 adjustment conducted in a secure manner against rotation in the adjustment cartridge, therefore, also a turn of the armrest 11 in the fundamentally horizontal plane. Advantageously, enter the interior walls of extension 17.1 and the walls outside of the two-deck cartridge 20 or cartridge 25 adjustment of a piece are provided locking means and retention which, on the one hand, limit the angular range of rotation and, on the other hand, they allow a gradual turn. Angular range for the possible turn it is given in this case by the interval angle of the locking or retaining means that is placed stepwise of the separation of the retention slots 17.2 or 27.1 retention caps or flanges. In a configuration advantageously, the closing block 27 that limits the stroke of the adjustment blade 30 in the one-piece adjustment cartridge 25 is equipped with a recess (figure 9a) in which a 27.1 retaining flange. This one is endowed with a 27.2 support that It acts elastically, for example, with a shaped elastomer. During the turn, the retention heel is pressed back by the exit of the retention groove, support 27.2 is tensioned elastic; when you reach the next retention slot, press the retaining flange inside it. Since to press backwards the retention heel must be used a certain force whose magnitude depends on the elastic support 27.2 configuration, as well as deformation of the retention grooves, it can thus achieve retention for the elimination of which is required forces in the desired magnitude.

This retention mechanism formed from this way with the retention cartridge 20 fixed to the structure bottom and adjustment blade 30 introduced in this cartridge 20 adjustment can be used universally. The cartridge 25 of one-piece adjustment or two-deck adjustment cartridge 20 can be used on any lower tubular part and the blade 30 adjustment can be attached with any object, so that said object can be adjusted gradually with respect to accommodation.

In a variant of a armrest with armrests 11 that can move in the direction of depth provided by your longitudinal extension is arranged in the lower part 12 of the armrest 11 a stage 51 that is fixedly connected by the screws 52 (figure 13a) or screws 54 (figure 13b) with the fixing plate 41 forming the head of the blade 40 of adjustment or, with its inclusion, with the sleeve header 14 of accommodation. The bottom 13 of the lower part 12 of the armrest 11 in this case it is placed mobile between this stage and the head of the housing sleeve 14.

The adjustment blade 40 is inserted in the adjustment cartridge 30, which is in turn in sleeve 14 accommodation. Screws 52 or 54 are driven in this case through holes 13.1 oriented in the direction of the depth, which are provided in the bottom 13 of the part 12 lower armrest 11. Therefore, stage 51 is fixed to the plate 41 for fixing the knife 40 for adjusting the such that the armrest 11 can move with the blade 40 adjustment if its position in height should be modified. For him adjustment of the armrest depth 11, it can move since its lower part 12 can move relative to the stage 51 (fixed layout). To do this, its header has domes 38 threads that are driven in oblong holes 12.1, preventing the height of the dome 38 threaded a retention and enabling a slide without impediments.

To achieve a gradual adjustment are planned retention means between the bottom 13 of the lower part 12 of the armrests 11. These are formed in one embodiment (shown in figure 13 with housing sleeve 14 only indicated schematically) because background 13 of part 12 bottom is provided with retention cavities 13.2 in which hook a 14.1 retention cap arranged on the side upper of the head of the housing sleeve 14. This advantageously, as already described, a support elastic as spring element with which the retention. For the movement of the armrest 12, exercise now a force in the direction of displacement that allows slide the retention cap 14.1 over the sloping walls of cavity 13.2 retention. The 14.1 retention cap is press back and release the retention joint.

In a second embodiment (shown in Figures 14 and 15 also with a housing sleeve 14 only indicated schematically), stage 51 is equipped with retention cap 53, and bottom 13 ’intermediate of part 12 lower armrest 11, continuous stroke in the representation, it presents cavities 13.2 of retention in which the retention cap 53. In the case of this configuration, it turns out advantageous that stage 51 is previously tensioned as consequence of the curvature of the lower part 12, so that return forces caused by deformation cause retention It is understood by itself that each of the retention cap configurations can also be used in the other provision.

One piece 60 adapting the sleeve of housing incorporated in figures 14 and 15 provides, acting  in conjunction with the 13 ’high intermediate fund, plus space to provide in a variant, between the fixing plate 31 of the adjustment blade 30 and the lower part 12 of the armrest 11, means that allow an adjustment in width of the armrest. For that is, an adaptation piece 60 of the housing sleeve is screwed with screws 52 with housing sleeve 14, so that the adjustment blade 30 placed in the cartridge 20 of adjustment is held mobile between the two, guaranteeing the threaded dome 38 (figures 3, 4 and 5) the necessary separation for it. Therefore, the possibility of height adjustment is provided described above.

This adapter sleeve 60 of accommodation is configured in such a way that a insert 61 of transverse guidance. This inserted piece of transverse guidance presents guide grooves 62 provided to both sides that, acting together with guiding strips corresponding on the inner side of the bottom of piece 60 of adaptation of the housing sleeve, force an angle guidance straight with respect to the longitudinal extension of the armrest 11.

In addition, in the 61 guided insert transverse is provided a return fork of form centered which is provided with a retaining bolt 63 which, such as already described, it is equipped with an elastic support that the press into one of the retention slots that are arranged correspondingly to the retaining bolt 63 in the inner side of the bottom of the adapter sleeve 60 housing, and with which joint bolt 63 of retention. The movement capacity is also guaranteed here by oblong holes that provide rectilinear guidance thanks to the joint action of the guide grooves 62 with the guide strips.

For adjustment, an adjustment force exerted laterally causes the retaining bolt 63 introduced to pressure in a retention groove 64 is pressed back against the return force exerted by the elastic support, so that retention is removed and the armrest can move approximately at right angles to the extension longitudinal.

Claims (16)

1. Adjustment mechanism for a piece to be adjusted with respect to a structure, especially for an armrest to be adjusted with respect to the lower structure of a furniture for sitting, said armrest being provided with a connected housing sleeve with the piece to be adjusted and which can be adjusted with respect thereto by hooking over an extension fixed to the structure, a retention mechanism for gradual adjustment being provided, characterized in that the extension (17.1) is at least partially configured as a tube, in which an adjustment cartridge (20; 25) is fixedly inserted with a hollow interior space in which an adjustment knife (30) is inserted together with the piece to be adjusted so that it can move relative to the cartridge (20 ; 25) of adjustment, the mechanical retention system being arranged inside the adjustment cartridge (20; 25). 2. Adjustment mechanism according to claim 1, characterized in that the adjustment blade (30) is formed by an insert (32) having at its free end a fixing plate (31) to be fixed to the adjustable part, with a guiding groove (33) and a guided release rod (42) therein having a release button (41) at its free end, the part (32) being inserted at its end arranged in the cartridge (20; 25) adjusting a window (34) oriented at right angles to the insert, and presenting the release rod (42) at its end disposed in the adjustment cartridge (20; 25) adjusting a guide (43) inclined as a guide slide for an inserted locking body (45) which, protruding laterally from the guide (43) inclined with its protruding parts (45.1), is driven in the window (34), when the release rod (42) is operated at right angles to to the axis of the adjustment blade (30) can be introduced in one of the corresponding retention openings or move out of them. 3. Adjustment mechanism according to claim 1 or 2, characterized in that the adjustment cartridge is configured as a part (25) inserted from a part, presenting the inner side of the hollow space of the adjustment cartridge (25) housing the knife (30 ) adjusting the retention openings, the retention openings being formed by a number of recesses separated from each other that act as retention openings (29) together with the locking body (45). 4. Adjustment mechanism according to claim 3, characterized in that the wall of the adjustment cartridge (25) made by forming a piece is formed by outer rings (26.1) and longitudinal ribs (26.2), whose intermediate spaces form recesses that act as openings ( 29) retention. 5. Adjustment mechanism according to claim 1 or 2, characterized in that the adjustment cartridge (20) is configured as an insert of two covers, with a pulsation cover (21) and a retention cover (22) presenting the openings of retention, the retention openings being formed by a number of transverse grooves (24) separated from one another that act together with the locking body (35). 6. Adjustment mechanism according to one of claims 2 to 5, characterized in that the release rod (42) acts together with a spring (46), preferably pre-tensioned, so that the release rod (42) is held in its guide (43) inclined in the locked position, in which the locking body (45) engages in one of the transverse grooves (24) that form the retention openings or in the retention openings (29). 7. Adjustment mechanism according to one of claims 1 to 6, characterized in that the free cross-section of the tubular extension (17.1) and the outer cross-section of the adjustment cartridge (20; 25) introduced therein are circular so that they can be rotated in the extension (17.1), preferably a mechanical locking or retention system being provided between the adjustment cartridge (20; 25) and the extension (17.1) so that the adjustment cartridge (20; 25) can be rotated gradually in the accommodation sleeve (17). 8. Adjustment mechanism according to claim 7, characterized in that to form the mechanical retention system the head of the adjustment cartridge (20; 25) and the end of the housing sleeve (17.1) corresponding to the head are provided with retention heels or retaining flanges (27.1) or with corresponding retention grooves (17.2), the retention heel / retaining flange (27.1) being preferably provided with an elastic acting support. 9. Adjustment mechanism according to one of claims 1 to 8, characterized in that the adjustment cartridge (20; 25) and / or the adjustment blade (25) with the part (27) inserted and the release rod with the button (32, 31) release and / or the mechanical retention system are configured as cast plastic injected castings. 10. Adjustment mechanism according to one of claims 1 to 9, characterized in that the surface of the plastic injection molded housing sleeve (13) is treated with a powder coating, a base plastic being preferably provided for powder coating of polyamide made conductive by carbon fibers and / or group of steel fibers. 11. Armrest for a furniture that sits on a support of the armrest, which can be fixed in the seat or in the seat support with a fixing tab that runs essentially horizontally, and has a extension extending essentially vertically, this armrest being provided with an adjustment mechanism according to one of claims 1 to 9, characterized in that in the extension (17.1) configured at least partially tubular the cartridge (20; 25) is inserted adjustment, whose foot is fixedly connected to the lower part (17) by means of a fixing bolt (19), and into which an adjustment blade (30) is inserted with the release (40) of the mechanical retention system, with whose upper end is fixedly attached to the armrest (11). 12. Armrest according to claim 11, characterized in that the release button (41) disposed on the upper end of the release rod (42) of the mechanical retention system is driven out of the lower part (12) of the armrest (12). eleven). 13. Armrest according to claim 11 or 12, characterized in that the armrest (11) is provided with means for movement in the depth direction corresponding to the longitudinal direction of the armrest (12), a mechanical retention system being preferably provided to enable a gradual displacement. 14. Armrest according to claim 13, characterized in that as a mechanical retention system a plate (51) is inserted into the lower part (12) of the armrest (51) which is connected with the blade fixing plate (31) (30) of adjustment by means of screws (54) driven through oblong holes (12.1), and sliding on a retaining rib (55), being provided between the plate (51) and the retaining rib (55) of retention in the form of a retention cap (52) and by retention points (56), the stage (51) being preferably conducted in such a way that it is subjected to a prior elastic tension. 15. Armrest according to one of claims 11 to 14, characterized in that the armrest (11) is provided with means for movement in the width direction, preferably a mechanical retention system is provided to enable a gradual movement. 16. Armrest according to claim 15, characterized in that as means for the movement of the armrest (12) in the direction of the width between the fixing plate (31) of the adjustment blade (30) and the part (12) The lower part of the armrest (11) is provided with a piece (60) for adapting the housing sleeve, into which a transverse guided insert (61) is inserted, which has a retaining bolt (63) with an elastic support that acts together with a retention groove (64) disposed correspondingly thereto on the inner side of the bottom of the adaptation piece (60) of the housing sleeve.