Pivot locking device and lifting device having a pivot locking device

The invention relates to a pivot locking device of two bearing elements (102, 103) oriented towards a common axis, in which one or both bearing elements (102, 103) are pivotable about a common pivot axis (22), with a first bearing element (102), which comprises a perforation (104), with a second bearing element (103), which comprises a perforation (106), wherein the first and second bearing elements (102, 103) are oriented in alignment to one another with the perforations (104, 106), with a chamber (124) provided on the first bearing element (102), which chamber comprises a circulatory path for circulatory elements (129) and is open to the second bearing element (103) and, by a connecting surface (118) facing to the chamber (124), is closed on the second bearing element (103), with a plurality of circulatory elements (129) arranged in the chamber (124), with an catch (121) arrangeable on the second bearing element (103), which catch engages into the circulating chamber (124) and is positioned between circulatory elements (129) and, in a pivot movement of the second bearing element (103) to the first bearing element (102), displaces the circulatory elements (129) in the chamber (124) along the circulatory path, and with a locking element (107) arranged on the first bearing element (102), which locking element, in an unlocking position (109), unblocks the circulatory path for the circulatory elements (129) in the chamber (124) and, in a locking position (108) of the locking element (107), blocks a displacement movement of the circulatory elements (129) along the circulatory path of the chamber (124).

The invention relates to a pivot locking device, as well as a lifting device with an up- and downwardly movable carrier and at least one support arm, pivotably mounted on the carrier, with a pivot locking device for the support arm.

EP 0 478 035 B1 discloses an arresting device for a support arm of a motor vehicle lifting platform. This vehicle lifting device includes at least one column, along which a carrier is up- and downwardly movable. Two pivotably mounted support arms are provided on the carrier. An arresting device is provided for adjusting an angular position of the support arms to one another, or of the support arm to the carrier. This arresting device consists of two cooperating toothed elements which are provided coaxially to the pivot axis. By a displacement movement along the pivot axis by a toothed element, this toothed element comes out of engagement from the other toothed element and unblocks a pivot movement of the support arm. Such an unblocking of the pivot movement is actuated in the lowering of the carrier onto the base. In the lifting of the carrier, the toothed elements oriented coaxially to the pivot axis are again moved towards one other, so that the toothed elements engage into one another. Here, high mechanical loads between the toothed elements can occur, insofar as these elements are not oriented with a gap to one another. Often, a manual supporting for the exact positioning of the support arm to the carrier for the aligned orientation of the toothed elements is required. Such toothed elements are subject to a high wear mechanism due to the mechanical processing and are cost-intensive in production.

DE 10 2007 020 041 A1 further discloses a mechanically configured support arm arrest for a lifting device. A first and a second locking element are oriented coaxially to a pivot axis in this support arm arrest as well, wherein an axial displacement movement by one of the two locking elements oriented to one another is initiated via the load bearing element in a lowering movement of a carrier onto the base. A pivoting movement of the support arm is thereby unblocked. In the lifting of the carrier, the two locking elements are again moved towards one another along the pivot axis, in order to lock.

The object underlying the invention is to provide a mechanical pivot locking device, in particular a lifting device, for arresting support arms with a pivot locking device which is configured mechanically simply and cost-effectively.

This object is achieved by a pivot locking device, which comprises two bearing elements aligned along a common pivot axis, wherein one or both bearing elements are pivotable to the common pivot axis, wherein a first bearing element comprises a first perforation, and the second bearing element comprises a second perforation, which are oriented in alignment to one another, and a chamber with a circulatory path is provided on the first bearing element, which is open to the second bearing element and is closed on the second bearing element by a connecting surface facing to the chamber, wherein a plurality of circulatory elements is arranged in the chamber and with a catch arranged on the second bearing element, which engages into the chamber and is positioned between circulatory elements and, in a pivot movement of the second bearing element, displaces the circulatory elements within the chamber, and with a locking element arranged on the first bearing element, which locking element unblocks the circulatory path of the chamber in an unlocking position and, in a locking position, blocks a displacement movement of the circulatory elements along the chamber.

Such a pivot locking assembly has the advantage that, for a release or a blocking of a pivot movement of the first bearing element to the second bearing element, the activation of the locking element is required, without a relative movement of the first bearing element to the second bearing element along the pivot axis being required. A flat pivot locking device can thereby be created, in which the construction volume is equal in a releasing, as well as in a blocking of the pivot movement. In addition, a wear-free configuration is made possible by means of this pivot locking device. Moreover, a finely graduated locking is preferably made possible due to the circulatory elements, so that a nearly continuous arresting of the first bearing element in an angular position to the second bearing element is made possible.

Preferably, the chamber is configured in the shape of a circle or a circular arc. A simple guiding of the circulatory elements inside the chamber can thereby be provided, which preferably includes a circulatory path.

Moreover, the chamber preferably comprises a blocking region with a width in front of and behind the locking element blocking the circulatory path of the chamber, so that the circulatory elements are guided through the blocking region in a single-tracked manner, that means that the circulatory elements are guided displaceably in a row one behind the other through the region in front of and behind the locking element. This makes the configuration of a simple locking mechanism possible, for example in such a way, that the locking element compulsorily leads one or multiple circulatory elements out of the blocking region of the chamber, whereby the locking element is positioned, with the locking portion, in the circulatory path of the circulatory elements.

The blocking region of the chamber preferably includes, in front of and behind the locking element, at least a length, viewed in the circumferential direction of at least one circulatory element. The catch likewise arranged in the chamber can thereby pass through an as large as possible pivot region at the second bearing element.

A preferred configuration of the pivoting device provides that the chamber has a constant width over the entire circumference, so that the circulatory elements are guided in a single-tracked manner only, that is in a row one behind the other. The width of the chamber thus corresponds to the diameter of one circulatory element, so that a plurality of circulatory elements, in a row one behind the other, is guided inside the chamber.

Alternatively, the pivot locking device can comprise a chamber which includes a storing region opposite the blocking region, the width of which storing region corresponds to two or multiple times the circumference of the circulatory elements. Inside such a storing region, the circulatory elements can, for example, be arranged two-, three- or multiple-tracked to one another, that means that multiple rows of circulatory elements guided one behind the other are oriented concentrically to one another. Such an arrangement has the advantage that, in a pivoting movement, a reducing of the forces can be made possible.

Moreover, a tapering region is preferably configured between the storing region and the blocking region of the chamber, in which tapering region the circulatory elements, lying next to each other in a two- or multiple-track manner, are transferrable onto a single-track arrangement in the blocking region. The tapering region can be configured funnel-shaped, so that the circulatory elements, formed into multiple tracks, in the tapering region, successively queue one behind the other in a single row, so that these elements thereafter lie only in one row one behind the other. Such a compulsory sorting can be actuated by a rotational movement of the catch in a pivoting movement of the second bearing element to the first bearing element.

To actuate a displacement movement of the circulatory elements inside the chamber, the catch is movably guided in the chamber. Preferably, the catch comprises radially oriented guiding surfaces, which are guided along an inner and outer chamber wall. A targeted force transmission can thereby occur in a pivoting movement of the bearing element, via an end face of the catch extending between the two guiding surfaces, onto the circulatory elements.

Advantageously, the catch comprises a movement path in a chamber with a storing region, which path is delimited via an angular region, along which the storing region extends. Preferably, a stop can be configured between the two bearing elements in order to limit this angular region.

In an catch, which is provided in a chamber with a constant width over the entire circumference, this member can comprise a movement path inside the chamber, which path extends over the entire circumference with exception to the blocking region.

The chamber provided at the first bearing element preferably has a depth which corresponds to the height of a circulatory element. Through the arrangement of only one layer of circulatory elements in the chamber, a particularly flat arrangement can be created.

The circulatory elements can be configured as balls, rollers, pins, arc segments, grains, sand or the like. In particular, in the employment of cylindrical pins or cylindrical rollers, these are preferably guided upright in the chamber, so that the external surfaces of the cylindrical pins of the cylindrical rollers rest on one another inside the chamber during a displacement movement and are supported on the chamber wall. The respective end surfaces of the cylindrical pins of the cylindrical rollers are, on the one hand, oriented to the base of the chamber and, on the other hand, to the connecting surface of the second bearing element. Preferably, polygonal or non-round pins or rollers are provided, which are guided upright. These comprise mutually opposite abutment surfaces or pressure surfaces for force transmission. These pins or rollers can also additionally or alternatively comprise at least one guiding surface, which is guided along a chamber wall. Alternatively, abrasive balls can also be employed.

Moreover, the locking element is preferably arranged, in a non-active or non-activated position, with a power-storing element in a locking position and preferably engages into the chamber in the blocking region. The set angular position is thereby only then released if an active activation occurs. For example, in the employment of the pivot locking device on a lifting device, the support arm can thus, in the lifting and lowering of the vehicle, remain secured in a locked position.

Moreover, the locking element is activatable by a displacement movement, in particular by a displacement movement oriented radially to the course of the chamber in the blocking region, or the locking element is activatable by a rotational movement. The flat arrangement of the pivot locking device can be maintained through the displacement movement, as well as the rotational movement.

A further advantageous configuration of the pivot locking device provides that the catch is detachably coupled with the second locking element. This has the advantage that a simple mounting and an assembly of pivot locking device are made possible. For example, the circulatory elements, as well as the catch, can be inserted in the chamber of the first bearing element in order to subsequently close the chamber by means of the second bearing element, wherein a coupling of the catch to the second bearing element is simultaneously made possible, so that a rotational movement of the second bearing element to the first bearing element can be transferred onto the catch.

Moreover, the first and second bearing element respectively comprise a flange portion for mounting on a component. This makes a flexible employment in different regions possible. Preferably, the pivot locking device is provided, in lifting devices, for lifting and lowering of loads, vehicles or the like, in particular for a support arm arresting.

The object underlying the invention is further achieved by a lifting device for lifting and lowering of loads, vehicles or the like with an up and downwardly movable carrier, on which at least one support arm, in a pivot axis, is pivotably mounted on the carrier, and preferably a free end of the support arm is movable under the load, the vehicle or the like, in which the pivot locking device is provided, according to one of the above described embodiments, between the carrier and the support arm. The support arm can thereby be arrestable, by means of a mechanically simple pivot locking device, in variously-adjustable pivot positions. By means of the finely-staged locking, a very exact positioning of the support arm to the load to be lifted, to the vehicle or the like can be made possible. In addition, the pivot locking device is simple to operate and wear-free. A rapid and smooth pivoting movement of the support arm is also made possible, despite the interposition of the pivot locking device, between the carrier and the support arm.

Moreover, an operating element changeable in position is preferably provided on the carrier of the lifting device, by means of which element, in the lowering of the carrier onto the base, or manually, the locking element of the pivot locking device is transferrable into an unlocking position.

FIG. 1, for example perspectively, illustrates a two-column lifting platform11, which includes two lifting devices12assigned to each other. This lifting device12includes a lifting column14, which is firmly connected, for example, with a baseplate16, which plate is stationary connected to a ground. A carrier17is provided upwardly and downwardly movable along a lifting axis15of the lifting device11. The carrier17receives a load bearing means18. The load bearing means18includes a housing portion19, which is at least partially closed, on the respective outer ends of which portion support arms21are pivotably received about a vertical pivot axis22. These support arms21are configured to be telescopic and comprise load bearing elements23or provisions opposite the pivot axis22, in order to interchangeably arrange various load bearing elements23thereon.

The carrier17moreover receives a drive device. This device can be configured electro-hydraulically, hydraulically or mechanically and comprises a hydraulic unit, according to the illustrated embodiment. This drive device is monitored and actuated by a controller. At least one accumulator can be provided, for example, for supplying energy. The controller advantageously operates wirelessly. In particular, a remote control can be provided in order to actuate the lifting devices12. In particular, the two lifting devices12, assigned to each other and oppositely disposed, also communicate with each other wirelessly, in order to ensure, for example, a simultaneous initiation of a lifting- and lowering movement, as well as a mutual monitoring of a synchronism or the like. Alternatively, supply lines and/or control lines can be provided between the two lifting devices12, so that control signals as well as a power supply are made possible in a wired manner.

According to the exemplarily illustrated embodiment, the lifting device12comprises a lifting column14with a U-shaped cross section, within which cross-section the carrier17is guided, upwardly and downwardly movably, by means of guides. Alternatively, the carrier can also be configured in a sleeve or cartridge-shaped manner and surround the lifting column. In such an arrangement, the drive spindle or the hydraulic cylinder, for lifting or lowering the carrier, is arranged inside the lifting column.

A further alternative embodiment of the lifting device12can also be such, that a lifting ram of a ram platform is provided in place of the lifting column and the up- and downwardly movable carrier, wherein the carrier is arranged on the upper end of the lifting ram, on which carrier the support arm(s) are provided.

Moreover, an alternative embodiment of the lifting device11can be such, that the up- and downwardly movable carrier17is moved up and down by means of a half scissor or a double scissor which, in turn, are activated with a hydraulic cylinder, on which carrier the support arm(s) can be arranged.

FIG. 2shows the arrangement of two support arms21on a carrier17, schematically enlarged. The support arm21can be extended, for example, and includes a support arm body52, which receives at least one support arm piece58therein displaceably. For example, a first support arm piece58is provided, which piece, in turn, receives a second support arm piece59, on the outer free end of which is arranged the load bearing element23. Moreover, an operating element60is provided on the carrier17, which element is assigned to a pivoting arrangement50, through which the support arm21is received about the pivot axis22in a manner pivotable to the carrier17. This operating element60serves to actuate a pivot locking device101. This pivot locking device101is positioned between the support arm21and the carrier17.

FIG. 3illustrates a schematic sectional view along the support arm21and the carrier17according toFIG. 2.FIG. 4shows a perspective sectional view toFIG. 3, with the operating element60being activated.

The pivoting arrangement50consists of an upper pivot bearing55and a lower pivot bearing70. These pivot bearings70are aligned along the common pivot axis22. This arrangement of the upper pivot bearing55and the lower pivot bearing70has the advantage that, within the support arm body52, a free space is brought created, so that at least one first and/or second support arm piece58,59is positionable between the upper and lower pivot bearings55,70. With respect to the pivoting arrangement50as well as the arrangement and embodiments and also the connection of the support arm21to the carrier17, reference is made to WO 2014/207217 in its entirety.

The pivot locking device101is provided to arrest the support arm21in an angular position or pivot position to the carrier17. This device is provided, for example, between an upper carrier portion48of the carrier17and an upper housing wall54of the support arm body52. This pivot locking device101is assigned to the upper pivot bearing55of the pivoting arrangement50. Alternatively or additionally, the pivot locking device101can be assigned to the lower pivot bearing70. In this case, the pivot locking device101is positioned between a lower carrier portion49of the carrier17and a lower housing wall72of the support arm body52.

The pivot locking device101includes a first bearing element102, as well as a second bearing element103. Each of the bearing elements102,103comprises a perforation104,106, through which a pivot bolt61of the upper pivot bearing55extends. The pivot locking device101moreover comprises a locking element107which fixates the first and second bearing element102,103, in a position to one another, or releases a relative pivot movement. InFIG. 3, the locking element107is provided in a locking position108. The pivot locking device101is blocked in this locking position108. The support arm21is secured against rotation in its position oriented to the carrier17.

InFIG. 4, the operating element60is transferred into an activation position111. This can occur by means of a manual lifting of the operating element60. Alternatively, the carrier17can be lowered onto a base, so that a lower contact surface112of the operating element60rests upon the base and transfers the operating element60into the activation position111. The locking element107is thereby transferred into an unlocking position109. A pivot movement of the first bearing element102to the second bearing element103is released. The support arm21is pivotable, about the pivot axis22, to a desired position relative to the carrier17.

The first bearing element102comprises a flange portion114or a fastening portion, through which the pivot locking device101is fastenable to the carrier17, in particular to the upper carrier portion48. The second bearing element103likewise comprises a flange portion115or fastening portion so that a support arm21, in particular an upper housing wall54of the support arm body52, is fastenable thereto. The pivot bolt61extends through the perforations104,106of the first and second bearing elements102,103, as well as through the corresponding openings in the upper carrier portion48and the upper housing wall54. The pivot locking device101is thereby arranged and oriented coaxially to the pivot axis22. The load bearing between the carrier17and the support arm21occurs via the at least one pivot bolt61,71.

FIG. 5illustrates a perspective view onto the pivot locking device101.FIG. 6shows a perspective view from below.

The first and/or second bearing elements102,103are preferably configured in a plate-shaped manner. The flange portion114,115is provided respectively on the external side of the first and second bearing elements102,103. For example, this can be a planar connecting surface with fastening boreholes or the like included therein. The locking element107is received on the first bearing element102. According to a first embodiment, this locking element is provided displaceably on the first bearing element102. The first and second bearing elements102,103comprise connecting surfaces117,118respectively directed at one another, which rest on one another and slide along one another in a pivot movement of the first bearing element102relative to the second bearing element103about the pivot axis22. A sliding-friction reducing surface coating can preferably be provided on the connecting surface(s)117,118. It can likewise be preferably provided that the surface portions of the connecting surfaces117,118, which portions are resting on one another, are reduced in order to decrease the friction of the pivot locking device.

The bearing element103receives a catch121, which is provided, in particular in an insertable manner, firmly on the bearing element102or detachably on the bearing element102. This catch121can, for example, have a geometric contour122secured against rotation, so that this catch orients itself automatically in the bearing element103. After the insertion of the catch21in the bearing element103, this catch, with its external side, is flush to the flange portion115.

The bearing elements102and103can be held together by a transport securing means105(FIG. 5) in a predefined position to one another until the bearing element102is fastened to the carrier17and the bearing element103is fastened to the support arm21. The transport securing means105can be configured to the end that a through bore is provided in the bearing element102and a thread is made in the bearing element103so that, by means of a screw, which is inserted through the through bore in the bearing element102, the two parts are fixed to one another by means of the thread in the bearing element103. After the mounting, this transport securing means105can, in a simple way, be detached and removed so that the bearing elements102and103are pivotable relative to one another about the axis22.

A sensor120(FIG. 5) can be provided for monitoring the pivot locking device101, by means of which sensor the position of the locking element107is monitored. Insofar as the locking element107, in a locking position108, is identified by the sensor120, a signal can be transmitted to the controller that a lifting and/or lowering of the support arms21is released.

Moreover, a further sensor130(FIG. 6) can be provided between the first and second bearing elements102,103. By means of this sensor130, can be detected a rotational position or angular position between the bearing element102and the bearing element103. This allows for detecting the orientation of the support arm(s)21with respect to a working space.

A sensor123(FIG. 6) can be provided on the bearing element103, in particular on a lower side115of the bearing element103. Using this sensor123, a stress can be detected which, upon lifting a load, acts on the support arm21. An overload protection, for example, can thereby be provided, insofar as the attempt is undertaken to lift a too heavy load. The signals of the above-mentioned sensors120,123,130can advantageously be transmitted to the controller of the lifting device11in a wireless manner.

FIG. 7illustrates a view onto an internal side, or onto the connecting surface117of the first bearing element102. The second bearing element103is removed. The locking element107is illustrated in a locking position.FIG. 8shows an analogous view toFIG. 7, with the deviation that the locking element107is arranged in an unlocking position109.

The first bearing element102includes a circulating chamber124. This chamber124comprises a closed or continuous circulatory path. The circulatory path of the chamber124comprises a base125, which is depressed relative to the connecting surface117. The chamber124comprises two chamber walls126,127oriented concentrically to one another. The chamber124is configured with a uniform width over its entire circumference. A plurality of circulatory elements129is arranged in the chamber124. These elements can consist of balls, for example. In the exemplary embodiment, the circulatory elements129are configured as cylindrical rollers or cylindrical pins. These circulatory elements129are provided upright in the chamber124, so that the respective circumferential wall of the circulatory elements129rolls off on the chamber wall126,127. The chamber124has a constant width, which is adapted to the diameter of the circulatory elements129. The circulatory elements129are thereby arranged in the chamber124in a single-tracked manner. The circulatory elements129are thus positioned in a row one behind the other in the chamber124.

The catch121engages into the chamber124and can, for example, be configured web-typed. This web131is adapted to the curvature of the chamber124. The respective end-faced ends of the web131rest directly against a circulatory element129, in turn.

The locking element107is held in the locking position108by a power-storing element133. In this locking position, a locking portion134of the locking element107crosses the circulatory path of the circulatory elements129or the chamber124. Here, individual circulatory elements129are guided out of the chamber124and are stored in a retaining portion135of the locking element107. Since the space inside the chamber124, between the locking element107and the catch121, or the web131of the catch31engaging into the chamber122, is filled out completely by circulatory elements129, a displacement movement of the catch121along the chamber124is blocked. A locking of the first bearing element102, to the second bearing element103, is thereby provided.

In order to initiate a pivot movement between the first and second bearing element102,103, the locking element107is transferred into the locking position109according toFIG. 8. Here, the circulatory elements129stored in the retaining portion135enter, in turn, in the circulatory path of the chamber124. This path is opened so that a circulatory movement of the circulatory elements129is made possible. This displacement movement of the circulatory elements129is actuated via the catch21.

According to an alternative embodiment not further illustrated, it can be provided that the retaining portion135can also store only one or two circulatory elements129. Depending upon the selection and physical configuration of the circulatory elements192, multiple circulatory elements129can also be stored in the retaining portion135of the locking element107.

In this embodiment, the center-to-center distance from a first to a neighboring pivot position is defined by the diameter of the circulatory elements129.

In this embodiment, a pivot region of the first bearing element102, relative to the second bearing element103, can be provided in an angular region, which is reduced by the region of the catch21, in particular the length of the web131and the length of the retaining portion135, seen in the direction towards the chamber124.

A further sensor132can be provided on the catch121, or in a region in which the catch121is connected with the bearing element103, through which sensor a torque load acting on the pivot locking device101can be detected. This sensor132can also wirelessly transmit signals to the controller.

FIG. 9illustrates an alternative embodiment toFIG. 7, of the first bearing element102. This embodiment deviates from the embodiment inFIG. 7in the configuration of the chamber124.

The chamber124comprises a blocking region141to the left and right of the locking element107, in which region one, two or multiple circulatory elements129are guided in a single-tracked manner. Respectively adjoining thereto, a tapering region142is provided, which connects the blocking region141with a storing region143. The storing region143is preferably opposite the blocking region141. The width of the chamber124is greater in the storing region143than in the blocking region141. The circulatory elements129can for example be arranged in a two- or multiple-tracked manner to one another in the storing region143. Two or multiple rows of circulatory elements129, oriented concentrically to one another, can thus be arranged in the storing region143. In the exemplary embodiment, the storing region143is configured in a three-tracked manner. The tapering region142makes possible that the circulatory elements129arranged in the storing region143in a multiple-tracked manner, are transferred into a single-tracked arrangement in the blocking region141.

In this embodiment according toFIG. 3, the pivot region of the first bearing element102to the second bearing element103is defined by the circumferential angle144of the storing region.

Within the storing region143, the internal and external chamber126,127are oriented concentrically at a constant distance, so that a guiding of the web131is provided. With regard to the further functioning, arrangement and configuration, reference is made toFIGS. 7 and 8.

FIGS. 11 and 12illustrate an alternative embodiment toFIGS. 9 and 10, of the pivot locking device101. This embodiment deviates in the configuration of the locking element107from the embodiment inFIGS. 9 and 10. The locking element107includes no retaining portion135. Much rather, a mandrel146is provided, which engages into a locking position108of the locking element107according toFIG. 11between two adjoining circulatory elements129, in a transferring out of an unlocking position109of the locking element107according toFIG. 12, and stops the circulatory path of the circulatory elements129inside the chamber124.

FIGS. 13 and 14further illustrate an alternative embodiment toFIGS. 9 to 12, of the pivot locking device101. This pivot locking device101shows a further alternative configuration of the locking element107. A rotational movement of the locking element107occurs in order to actuate the locking element107out of an unlocking position109accordingFIG. 14into a locking position108according toFIG. 13. The circulatory elements129positioned in the retaining portion135of the locking element107are guided out of the circulatory path of the chamber124so that, with circulating wall portions of the locking element107, the circulatory path is blocked inside the chamber124. The activation of the locking element107can be actuated manually by means of a lever148, or also via the operating element60. The pivot movement of the locking element107is limited by a stop151in the form of a pin. On one or both sides of the stop151, at least one return element152, in particular a compression spring element, is provided. This return element152is introduced into the recess, inside which the stop151is pivotable. That is, a return of the locking element107into an unlocking position109can thereby not be carried out independently. Otherwise, the embodiments relating to the preceding embodiments apply.

FIG. 15illustrates a schematic sectional view of an alternative actuation of the pivot locking device101by an operating element60.FIG. 15shows the pivot locking device101only partially with the first bearing element102and the locking element107in the locking position108.FIG. 16shows this arrangement in an unlocking position103.

In this embodiment, the operating element60is guided in the pivot bolt61, which extends through the perforations104,106of the first and second bearing elements102,103. A pin162is guided via a cross bore161in said pivot bolt61. An end of the pin162acts upon the locking element107. The opposite end of the pin161is oriented towards the operating element60. The operating element60comprises a first and second guiding portion164,165for the axial displacement movement within the pivot bolt61. Between the first and the second guiding portion164,165, a control element166is provided in the form of a conically extending surface, which tapers in cross-section with respect to the first and second guiding portion164,165. By means of a power-storing element167, the operating element60is arranged in an inactive position110. The guiding portion164presses the pin161against the locking element107, so that this element is arrested in the locking position108. In the lowering of the pivot locking device101—for example in the direction towards the floor—the operating element60plunges into the pivot bolt61and is transferred into an activation position111. The locking element107is transferred, through the power-storing element133, into the unlocking position107, since a movement path for the pin162is released due to the control element166and the pin162can plunge into the pivot bolt. This is illustrated inFIG. 16. As soon as the position is set and the pivot locking device101is lifted, the power-storing element167presses the bolt60into the inactive position110, and the locking element107is transferred into the locking position108.

FIG. 17shows a schematic view onto a first bearing element102, according toFIG. 7. This embodiment inFIG. 17deviates in the specific configuration of the circulatory elements129. The circulatory element129, which is used in the embodiment of the bearing element102according toFIG. 17, is illustrated in a perspective view inFIG. 18. This circulatory element129is a body, facing away from a pin or a roller, with a longitudinal axle, which comprises an outer guiding surface171, which surface can be configured rectilinearly or slightly curved. In the event of the curved embodiment, this curvature can be adapted to the curvature of an external chamber wall126, so that a guiding along the chamber126is possible. A rounded sliding surface172is preferably provided opposite the guiding surface171, which sliding surface is supported on the internal chamber wall127. Pressure surfaces173are provided between the guiding surface171and the sliding surface172. These pressure surfaces173are oriented parallel to one another or inclined in a slight angle to one another. In the latter case, the angle is adapted to the size of the diameter of the chamber124. The two support elements129adjacent to one another can thereby rest on one another with their pressure surface173so that a surface pressing is provided. A geometry of the circulatory element129results from this arrangement, which element, in a sectional view or in a plan view, corresponds to a loaf of bread.

In the circulatory element129illustrated inFIG. 18, the guiding surface171and the sliding surface172can also be reversed. Alternatively, the guiding surface171, like the sliding surface172, can also be configured with a curvature. Likewise, the sliding surface172can, instead of the illustrated contour, also have the contour of the guiding surface171. The respective end faces of the circulatory elements129can be configured as a sliding surface or as a spherical surface, in order to achieve a low friction on the chamber base125.