Device to mutual axial shift of a screw pillar and a support bearing

The invention concerns a device accommodated in a housing for the pre-determined and limited mutual axial shift of a rotary or lengthwise-adjustable screw pillar on the one hand and at least one thereby in interference standing and on it unreeling gear wheel on the other hand, whereby the gear wheel and/or the screw pillar can be axially adjustable in the housing, and the gear wheel on an axle of a support bearing stored in the housing is rotatable stored. The support bearing can preferably serve as temporary storage facilities, which with long screw pillars is very favourable, since it permits a replacing of another Zwäschenlagers, which for example of on the screw pillar of walking, axialmoved body, e.g. mother, was away-pushed. One receives thereby a always-lasting storage although the body moves over the whole expansion of a long screw pillar. Breaking or swinging the screw pillar is prevented by this additional, replaceable storage. These additional storage may not disturb the way of the Gewiudemntter. With österr. Patent specification Nr.36439 is become known a device, with which two gear wheels are arranged, which intervene on a Mantellinie combing in a Gewirtdespindel. Furthermore there is present pawls, which affect the gear wheels and block these in their camp body, so that at rotation of the screw pillar a shift between camp bodies and screw pillar in oh direction the same takes place. If this shift is unwanted, then the handle one releases. This Einund releasing requires from the outside operated controls. The used handle works only in a direction of rotation, i.e. it works as barrier against reversed execution. Zlel of the invention is a device, with which the camp bodies work as additional support bearings and move themselves depending upon direction of rotation of the screw pillar like a thread mother, which permit a rotation of the gear wheels however with impact an obstacle, so that no mutual shift must take place. This is retarded according to invention during a device of the kind mentioned thereby reached that at the gear wheel a brake is arranged, its free run, and that in the shift way of the support bearing way limitation attacks are arranged. Brake the affecting the gear wheel secures the gear wheel against rotation in its camp and releases with tricks of the screw pillar a movement of the camp body of the gear wheel in oh direction of the spindle, if this camp body at swivelling is prevented around the spindle. If the camp body pushes during its axial movement against an obstacle, then this axial shift is interrupted, without causing a blocking between gear wheel and spindle. The gear wheel rotary in its camp under overcoming of the keeping still strength expenditure-practiced by the brake on the gear wheel. As soon as the support strength caused by the obstacle decreases or is changed the Drehrichtuug of the screw pillar, outweighs again Kraft of the brake on the gear wheel, which stands still now in the camp body. The shift of the camp body in oh direction of the screw pillar sets. The device works thus fully automatic. In the designs a Aus£ührungsbeispiel of the invention is represented to Fig.1 to 3 per a profile, u.zw shows up by a device with walking mother in three positions and replacing support bearings, Fig.4 in larger yardstick a cross section by a support bearing of the device, Fig.5 in the detail a simplified Schuittansicht of an axial section by the same device in the same yardstick and Fig.6 a side view on the mother. In accordance with the first Ausführuugsvariante, which lifting equipment represents, is the screw pillar --2-- into the ¢0 both Flanscheu ---3-- the housing --1-- rotatable stored. On the spindle --2-- the mother sits --4--, depending upon the direction of the rotation of the spindle over the whole length of the spindle hinund moves. The mother can be trained as promotion unit. Because of the large Läaage of the spindle --2-- and the Kra£tabnahrne at the mother --4-- the spindle must --2-- between the two Flanscheu --3-- still at least once fallen its, which over the support bearing ¢5 --5-- in Fig.1 takes place. Since however the mother the outer SteUe, at which this support bearing is arranged, must slide past, shifts the support bearing on the kind described later to the Flunsch --3a-- too, u.zw. with same feed speed as the mother --4---. At the same time a further, homogenous support bearing moves --5a-- of the Flanseh --3-- behind the mother --4-- ago against the center of the lifting equipment too. One arrives in such a way at the position in accordance with Fig.2. The mother walks --4--- far and over the center of the spindle --2-- outside, then the stop bolts prevent --6-- there that the second support bearing --moves 5a on, where it the full function of the first camp ---5-- to Fig.1 transfers. It verb-borrows despite far rotation of the spindle --2-- in the position shown in Fig.3, while the mother --4---of the pins --6-- remains uninfluenced and further-walks. In the meantime the first camp arrives --5-- to the end of the spindle --2--, where it against the flange --3a-- lies close. The three Fig.1 to 3, remains at any time sufficient stored the spindle is shown to 5 as in, i.e. the distance between two bearings --3 - 5 - 3a and/or 3 - 5a3a and/or 5a - 5-- the same always remains and becomes larger not. It can become smaller at the most: --3 - 5a and/or 5 - 3a--, which represents however no disadvantage. Requires the length of the spindle --2-- more than an inserted support bearing --5--, then the housing with further, in desired distance knows pin from each other arranged --6-- or pairs of pins as i0 of attacks provided its, whereby reciprocally the mother --4-- per so many support bearings --5-- are arranged, when the housing exhibits attacks. One temporary storage facilities each are then in such a way trained that it fastens and is held at a pin or a pair of pins. The support bearing --5-- consists of a plate --7-- with recesses --8-- for the admission ever a gear wheel --9--, which ever into the thread of the spindle --2-- intervenes, so a Schneckentrieb forming. Each gear wheel sits swivelling on an axle --10--, those in the plate --7-- is fastened. To the axle a compression spring is centric --13-- arranged, those the gear wheel --9-- against the plate --7-- presses. By VersteUen of the compression spring --13-- - which by rotating the axle screw --10-- taken place - the axial pressure can on the gear wheel --9-- are varied, which a change of the friction brake expenditure-practiced on the gear wheel between gear wheel --9-- and plate --7-- results in. This pressure and/or the friction force must be so strongly stopped now that it the braking action between plate --7-- and housings --1-- exceeds. During the turn of the spindle --2-- moves the camp --5-- in the kind of a mother axially to the spindle --2--. This progressive movement takes place now, until a retaining strength, those on the camp --5--- one expenditure-practices, is larger than the braking action between gear wheel --9-- and plate --7--. This is when fastening the camp at the pin --6-- or at one of the flanges --3 or 3a-- the case. Now however the Schneckentrieb is not blocked by the descriptive arrangement, but the spindle --2-- can keep turning; while the support bearing --5-- , begins now the gear wheel stands still --9-- to turn after overcoming of its Reibungskra£t. Thus the mother --4-- not even by the pins --6-- , points it is blocked to recesses --26-- up, by which the pins pass through. In the descriptive example is the shifting mother --4-- as ring with internal thread meant, which thread into the thread of the spindle --2-- intervenes. The mother --4-- in addition, can the same constructional structure exhibit as the support bearing --5--. Possibly the brake pressure would have to be increased to the gear wheels, thus this mother element ---4-- also outward to deliver knows shift forces. With standing Wellenachse and gear wheel axle exhibits perpendicularly to each other the gear wheel favourable-proves a helical gearing. Is the gear wheel --9-- straight interlocked, is to form the gear wheel axle an appropriate angle with the spindle. In the camp --5-- can instead of two wheels --9-- only one wheel arranged its. The effect connection with the spindle is important --2--. There the support bearings --5-- in the housing --1-- slide, preferably consist they of plastic, which particularly serves sliding material as Lageroder.