the following is a detailed description of example embodiments of the invention depicted in the accompanying drawings . the example embodiments are presented in such detail as to clearly communicate the invention and are designed to make such embodiments obvious to a person of ordinary skill in the art . however , the amount of detail offered is not intended to limit the anticipated variations of embodiments ; on the contrary , the intention is to cover all modifications , equivalents , and alternatives falling within the spirit and scope of the present invention , as defined by the appended claims . a vehicle seat 1 is shown in fig1 to comprise a seat body 2 , on which a backrest 3 is mounted to be pivotable . the seat body 2 is supported on a framework 4 , wherein the seat body 2 is held on the framework 4 via two parallel levers 5 . an adjustment device 6 , including a drive lever 7 that is rotatable about a horizontal axis in both directions , is installed on the seat body 2 . if the drive lever 7 is pivoted upward into a position 7 a , pivoting of the lever 5 clockwise can be initiated via the adjustment device 6 , whereby the seat surface 2 is lowered . if the drive lever 7 is pivoted downward into position 7 b , rotating of the lever 5 counterclockwise is caused via the gearing , so that the seat body 2 is raised . in fig2 and 3 , the adjustment device 6 is shown . the adjustment device 6 comprises a housing 80 , which has a flange 8 with openings 9 on opposing sides , to fix the housing 80 on the seat body 2 . the housing 80 is closed on the upper side by a cover 50 , which is implemented as plate - shaped and has webs 52 , which engage between projections 55 of the housing . the housing 80 and the cover 50 are penetrated by an axle 17 . as shown in fig3 , the axle 17 has a smooth - walled section and a middle section having radially protruding wedges 19 , which are used for the rotationally - fixed fixation of an inner ring 12 of a first clamping body freewheel 10 . furthermore , a protruding pinion 18 is provided on the axle 17 , which is engaged with a gearing , in particular a toothed rocker , which is implemented on a lever 5 or a part connected to the lever 5 , to be able to perform a vertical adjustment of the seat body 2 via the pinion 18 . the first clamping element freewheel 10 comprises cylindrical clamping elements 13 and 13 ′, which press against a cylindrical internal surface of an outer ring 11 . furthermore , the clamping bodies 13 and 13 ′ press against the inner ring 12 , which has a round contour , and has a flattening 14 in each case in the region of the clamping elements 13 and 13 ′. a block 45 made of an elastic material is inserted between the clamping elements 13 and 13 ′. the inner ring 12 can be blocked and released in both directions in relation to the outer ring 11 via the clamping elements 13 and 13 ′. in a starting position , inner ring 12 and outer ring 11 are blocked in relation to one another , since in each case one of the clamping elements 13 and 13 ′ causes a blocking in one direction . if the clamping element 13 is moved slightly by a release element 70 having projections 71 in a circumferential direction , the release is achieved and the blocking is canceled . the inner ring 12 can then be rotated in relation to the outer ring 11 in a first rotational direction . if the release element 70 having the projections 71 is moved in the opposite direction and the clamping element 13 ′ is shifted , a movement of the inner ring 12 in relation to the outer ring 11 in the opposite direction is released . the outer ring 11 is connected rotationally - fixed in this case to a housing lower part , which is implemented as plate - shaped and has outwardly protruding webs 15 . upwardly protruding sleeves 16 are provided on the webs 15 , which engage in the openings 9 of the housing 80 , so that housing lower part and housing 80 are fixed in a rotationally - fixed manner on one another . the adjustment device 6 according to the invention furthermore comprises a second damping element freewheel 20 , which is released via an actuating element 40 . the second clamping element freewheel 20 comprises in this case an outer ring 30 , which has two radially protruding projections 31 having openings 32 , on which the drive lever 7 is fixed . the first clamping element freewheel 10 and the second clamping element freewheel 20 are arranged inside the housing 80 , which is closed using the cover 50 . the cover 50 has an internal opening 51 for leading through one end of the axle 17 . furthermore , recesses 53 are provided between the webs 52 , in which the projections 55 , which protrude from a support surface 54 , engage . fig4 shows the first clamping element freewheel 10 in a top view . the inner ring 12 comprises a nonround contour having flattenings 14 , at each of which a pair made of a clamping element 13 and a clamping element 13 ′ is provided . an elastic block 45 is arranged between the clamping elements 13 and 13 ′ of a pair . between two clamping elements 13 and 13 ′, at which no elastic body 45 is provided , i . e ., between two adjacent pairs of clamping elements 13 , 13 ′, a projection 71 of a release element 70 engages in each case , wherein the release element 70 is implemented as essentially ring - shaped and is connected on the inner side in a rotationally - fixed manner to the axle 17 . the projections 71 are bent over and engage essentially in a formfitting manner or with little play between the clamping elements 13 and 13 ′, as shown in fig5 . the second clamping element freewheel 20 is shown in fig6 . the clamping element freewheel 20 comprises an inner ring 21 , which has receptacles for the wedges 19 of the axle 17 on the inner side and is therefore connected in a rotationally - fixed manner to the axle 17 . the inner ring 21 is implemented as cylindrical on the outer circumference and presses against clamping elements 22 and 22 ′. an outer ring 30 is provided around the clamping elements 22 and 22 ′, which implements a cross section deviating from the cylindrical body , to jam the clamping elements 22 and 22 ′ in opposite directions . an elastic block 23 is provided between the clamping elements 22 and 22 ′. in a starting position , the inner ring 21 is blocked in relation to the ring 30 in opposite directions , wherein a release of the blocking occurs when in each case one of the clamping elements 22 or 22 ′ is shifted against the force of the elastic block 23 , so that then the ring 30 can be rotated in relation to the inner ring 21 in one direction . the function of the second clamping element freewheel 20 is therefore similar to the first clamping element freewheel 10 . in the second clamping element freewheel 20 , the outer ring 30 is coupled to the drive lever 7 via the projections 31 . in fig7 , an essentially disk - shaped actuating element 40 is placed on the second clamping element freewheel 20 . the actuating element 40 is ring - shaped and comprises projections 41 protruding perpendicularly downward , which engage between two clamping elements 22 and 22 ′, to displace one of the clamping elements 22 or 22 ′ depending on the rotational direction and thus achieve a release . furthermore , the actuating element 40 is provided with an internal cylindrical opening 43 , through which the axle 17 is guided . a protruding web 42 is implemented on one side of the actuating element 40 , which engages between two springs 60 and 61 , as will be explained hereafter . fig8 shows the housing 80 with the two springs 60 and 61 . the springs 60 and 61 are implemented as coiled springs and are arranged essentially in a semicircle inside the housing 80 . the springs 60 and 61 , which are compression springs , and are each held in a curve in a receptacle , wherein one end side of the springs 60 and 61 is supported in each case on a first stop 62 or an opposing stop 65 . a slot 63 is provided on the stop 62 and a slot 64 is provided on the stop 65 . the actuating element 40 engages with the projection 42 in the slot 64 . on the opposite side , a projection 33 on the ring 30 engages in the slot 63 . during the rotation of the ring 30 , firstly the second clamping element freewheel 20 is unlocked and then moves , via the clamping element 22 or 22 ′, the actuating element 40 , which is moved via the projections 41 with the clamping elements 22 and 22 ′. the projection 42 thus also moves in the rotational direction of the ring 30 against the force of one of the springs 60 or 61 . fig9 shows the housing 80 with the springs 60 and 61 , which are held in curved receptacles . the stops 62 and 65 also can be seen , on each of which a slot 63 or 64 is implemented . the springs 60 and 61 are arranged essentially in a plane perpendicular to the longitudinal direction of the axle 17 , the springs 60 and 61 at least overlap in this plane , so that a more compact structure is obtained . fig1 shows the housing 80 in an exploded illustration . the housing 80 comprises curved receptacles 66 and 67 , in each of which a spring 60 or 61 , respectively , is received . as fig1 shows , the slot 64 is not only located in the region of the stop 65 , but rather also extends as the slot 68 into the receptacle 66 and the receptacle 67 . the actuating element 40 can thus be moved from a middle position , in which the projection 42 is arranged in the region of the stop 65 , in both rotational directions along the slot 68 . on the opposite side , the slot 63 is provided on the stop 62 , which extends on opposite sides as the slot 69 . the projection 33 of the ring 30 is thereby rotated out of the middle position against the force of the springs 60 or 61 in opposite directions . in the event of a movement of the drive lever 7 downward from a middle position , an adjustment operation is initiated , in that the output element is rotated using the pinion 18 . if the drive lever 7 is then let loose , one of the springs 60 or 61 causes a reset into the blocked position , so that a manual adjustment operation of the seat body 2 may be carried out . vice versa , the drive lever 7 is then moved upward out of the middle position , to cause an adjustment of the seat body upward , wherein then the pinion 18 is blocked in the adjusted position and the drive lever 7 is pivoted back into its middle position by the force of one of the springs 60 or 61 . as will be evident to persons skilled in the art , the foregoing detailed description and figures are presented as examples of the invention , and that variations are contemplated that do not depart from the fair scope of the teachings and descriptions set forth in this disclosure . the foregoing is not intended to limit what has been invented , except to the extent that the following claims so limit that .