Pivoting system for a chair

The seat surface of a chair of a chair lift can be pivoted with the aid of a pivot mechanism. Thus, the seat surface can, while a passenger is sitting thereon, be pivoted in such a way that it extends so as to descend, or descend more markedly, toward the rear edge of the seat part. Passengers enter automatically, and independently of their size and sitting position on the chair, into a stronger, stable back position, thereby reliably counteracting slipping in the direction of the front edge of the seat part and thus slipping-through between the seat surface and transverse hoop.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority, under 35 U.S.C. §119, of Austrian application A 1546/2008, filed Oct. 2, 2008; the prior application is herewith incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

Field of the Invention

The invention relates to a chair of a chair lift with at least one seat which is arranged on a frame of the seat and has a seat part and a back rest. The seat part has a seat surface and the back rest has a back rest surface and the seat part has a rear edge associated with the back rest and a front edge opposing the rear edge.

Furthermore, the invention relates to a method for operating a chair lift, a chair with at least one seat having a seat part and a back rest being moved from one station to another station. The seat part has a seat surface and the back rest has a back rest surface, the seat part has a rear edge associated with the back rest and a front edge opposing the rear edge and the back rest has a lower edge associated with the seat part and an upper edge opposing the lower edge.

Chairs for chair lifts usually have one or up to eight seat(s) positioned next to one another. In order to prevent the passengers from falling out of or slipping off the chair, these chairs usually have hoop guards which extend over the entire width of the chair. These hoop guards can be pivoted from a position in which they are located above the passengers to a position in which a transverse hoop extends before the passengers and their thighs. Furthermore, a number of foot rests corresponding to the number of seats is often also provided on the closing hoops.

Relatively small persons, in particular children, are often unable to assume the correct sitting position in which the entire back is supported on the back rest, so that they accordingly hang on to the hoop guard, in particular to the transverse hoop, as a result of which their bottom enters the region of the front edge of the seat surface. As, according to the regulations, the distance between the transverse hoop and seat surface is of dimensions such that even large passengers having relatively long legs can comfortably fit under the transverse hoop, this distance is generally too great for relatively small persons, so that it is possible for these relatively small persons to slip through under the transverse hoop, in particular if their relatively short legs prevent them from supporting their legs on the foot rests.

SUMMARY OF THE INVENTION

It is accordingly an object of the invention to provide a pivoting system for a chair which overcome the above-mentioned disadvantages of the prior art methods and devices of this general type, which reliably prevent, irrespective of the size of the person and the position in which they are sitting on the chair, slipping in the direction of the front edge of the seat and thus slipping-through between the seat surface and transverse hoop.

With the foregoing and other objects in view there is provided, in accordance with the invention a chair of a chair lift. The chair contains a frame, a pivot mechanism, and at least one seat disposed on the frame. The seat has a seat part and a back rest. The seat part has a seat surface and the back rest has a back rest surface. The seat part has a rear edge associated with the back rest and a front edge opposite the rear edge. The seat surface can be pivoted via the pivot mechanism.

As a result of the fact that the seat surface can be pivoted with the aid of a pivot mechanism, the seat surface can, while a passenger is sitting thereon, be pivoted in such a way that it extends so as to descend, or to descend more markedly, toward the rear edge of the seat part in comparison to the conventional position. The passengers' weight is then automatically deflected in the direction toward the back rest and toward the rear edge of the seat. Passengers enter automatically, and independently of their size and sitting position on the chair, into a stronger, stable back position, thereby counteracting slipping in the direction of the front edge of the seat and thus slipping-through between the seat surface and transverse hoop.

In a preferred embodiment of the invention, the seat surface and the back rest surface can be pivoted with the aid of a pivot mechanism. Thus, even if the back rest surface is pivotable, the conventional angle between the seat surface and back rest surface can, in the pivoted position of the seat, be maintained or re-established in order to maintain the sitting comfort to which the passenger is accustomed.

Preferably, the angle between the seat surface and back rest is varied relative to each other at least temporarily. Within the scope of the invention, this may be carried out in particular in that first the seat surface and afterwards the back rest surface is pivoted, or in that first the back rest surface and afterwards the seat surface is pivoted. It is also possible for only the seat surface to be pivoted, whereas the back rest surface remains permanently in the same position.

Alternatively thereto, provision may also be made for the seat surface and the back rest surface to be pivoted at the same time and if appropriate about the same pivot axis, in that the seat as a whole is pivoted. What is important is that the seat surface extends, after the pivoting, so as to descend toward the rear edge.

Furthermore, it is preferred that the seat surface and if appropriate the back rest surface be pivotable about a pivot axis extending substantially parallel to the rear edge of the seat part. Within the scope of the invention, this pivot axis can be arranged in the region of the rear edge of the seat part or in the region of the center of the seat part or in the region of the front edge of the seat part. If the pivot axis is located in the region of the rear edge of the seat part, then the front edge can be raised, whereas the position of the rear edge is not altered. If the pivot axis is located in the region of the front edge of the seat part, then the rear edge can be lowered, whereas the position of the front edge is not altered. If the pivot axis is located in the region of the center of the seat part, then the front edge can be raised, while the rear edge is lowered.

A sequence in time of the pivoting according to the invention may be illustrated, by way of example, which is now described.

A passenger sits down, as is usual in a station, on a seat of the chair of the chair lift, the seat being in the conventional position or in a position which is lowered slightly forward in relation to the conventional position. Before or during the departure of the chair from this station, the seat surface is pivoted after the entrance region in such a way that the front edge of the seat part is raised. In this case, the rear edge of the seat part may, depending on the position of the pivot axis, remain arranged in a stationary manner or be lowered accordingly. Alternatively, the seat surface can also be pivoted after the entrance region in such a way that the rear edge of the seat part is lowered while the front edge is arranged in a stationary manner. In addition, the back rest surface can be pivoted simultaneously or with a slight time offset, in that for example the upper edge of the back rest is moved counter to the direction of travel of the chair.

During the journey from the station to a subsequent station, the seat is held in this position in which the passenger automatically enters a stronger, stable back position and is pressed against the back rest.

Before the exit region of the next station, the seat surface is pivoted in such a way that the front edge of the seat part is lowered. In this case, the rear edge of the seat part may, again depending on the position of the pivot axis, remain arranged in a stationary manner or be raised accordingly. If, alternatively, the rear edge of the seat part was previously lowered while the front edge is arranged in a stationary manner, then the rear edge of the seat part is now raised while the front edge is arranged in a stationary manner. If the back rest surface was previously pivoted as described above, then the back rest surface is also pivoted into the starting position, in that simultaneously or with a slight time offset the upper edge of the back rest is moved in the direction of travel of the chair lift. The seat is back in the position described at the outset. The guest can climb out of the chair as usual.

Within the scope of the invention, each seat can have associated with it its own pivot mechanism. However, it is preferred if a pivot mechanism is jointly associated with at least two seats, in particular with all the seats. The pivot mechanism can be arranged laterally next to the chair or, depending on whether the front edge is to be raised or the rear edge lowered, in the front or in the rear region of the seat, preferably below the seat.

Within the scope of the invention, it is also possible for the pivot mechanism to extend over all or part of the width of the chair. Likewise, it is possible for the pivot mechanism to have at least one lifting and lowering device arranged at certain points, such as for example a piston arranged behind, below or laterally next to the chair or at least one seat.

Although the invention is illustrated and described herein as embodied in a pivoting system for a chair, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.

DETAILED DESCRIPTION OF THE INVENTION

Referring now to the figures of the drawing in detail and first, particularly, toFIGS. 1 and 2thereof, there is shown a chair1of a chair lift with a hoop guard2, which has a mechanism3for actuating the hoop guard2. The remaining parts illustrated inFIGS. 1 and 2may be configured as is conventional in the prior art. Reference is therefore merely made in general terms to the fact that the hoop guard2is arranged on a frame4which is connected via a joint5to a support rod6, attached to the upper end of which is a clamping device7for fastening the chair1to a hauling cable8. The invention may be used, independently thereof, also for other configurations of chairs, in particular couplable chairs.

Furthermore, reference is made in general terms to the fact that the chair1has at least one seat9having a seat part31and a back rest11, the seat part31having a seat surface10and the back rest11having a back rest surface12and the seat part31having a rear edge13associated with the back rest11and a front edge14opposing the rear edge13. The back rest11has a lower edge15associated with the seat surface10and an upper edge16opposing the lower edge15.

FIGS. 3 and 4show an embodiment of the chair1of a chair lift in which, according to the invention, the seat surface10can be pivoted with the aid of a pivot mechanism17.FIG. 3shows two positions of the seat surface10. The lower position is the entrance or exit position of the seat surface10, in which the seat surface10extends in a manner such as it is arranged, for example, on the frame4in a conventional chair1of a chair lift. The upper position is the pivoted position of the seat surface10, in which the seat surface10extends so as to descend, or descend more markedly, toward the rear edge13of the seat9. The seat surface10is in this upper, pivoted position as the chair1travels from one station to another station (travel position). The pivot mechanism17, which inFIGS. 5 and 6may be seen more clearly from the front, is illustrated inFIG. 3merely for the lower entrance or exit position of the seat surface10and corresponds to the position of the pivot mechanism17as shown inFIG. 5.FIG. 4shows the pivot mechanism17for the travel position of the seat surface10, corresponding to the state of the pivot mechanism17as shown inFIG. 6. The pivot mechanism17shown inFIGS. 3 to 6is jointly associated with all the seats9and extends in the front region and below the seat9. The pivot mechanism extends in this case substantially parallel to the front edges14of the seat9over the entire width of the chair1.

The pivot mechanism17has inFIGS. 5 and 6two profiles18,19which are displaceable relative to each other. The lower profile18is displaceably mounted on the frame4and acts as the control profile18. The upper profile19is securely connected to the underside of the seat9in the region of the front edges14thereof. The control profile18is shorter than the upper profile19so that it does not protrude beyond the width of the chair during displacing. The control profile18has bolts20which are guided within slots21provided in the upper profile19. The slots21have a lower portion22extending substantially parallel to the longitudinal extension of the profiles18,19and a portion23extending obliquely upward.

In the unpivoted state of the seat surface9, the end of the control profile18that is shown on the right-hand side inFIGS. 5 and 6is located in the region of the right-hand end of the upper profile19, the bolts20of the control profile18being arranged in the upper end of the oblique portions23of the slots21. When the control profile18is displaced toward the left inFIGS. 5 and 6, so that the left-hand end of the control profile18is then located in the region of the left-hand end of the upper profile19, then the oblique portion23of the slots21causes the upper profile19to be displaced upward but not toward the side. The upper profile19remains securely in this position, without lowering accidentally, as the bolts rest against the outer end of the lower portion22of the slots21, which portion does not allow vertical movement. The upper profile19and thus the front edge14of the seat9can be lowered again only when the control profile18is displaced back again.

In this embodiment, only the seat surface10is pivoted, in that the front edge14of the seat9is raised, the pivot axis24being arranged in the region of the rear edge13of the seat part31.

The pivot mechanism17can be actuated with the aid of a device arranged in a station, such as for example by coupling to the mechanism3for actuating the hoop guard2(FIGS. 1 and 2). For this purpose, the mechanism3for actuating the hoop guard2can be equipped, for example, with a sheathed cable25which causes the displacing of the control profile18either directly or indirectly, for example via a device26for closing and blocking the opening of the hoop guard2.

With reference toFIGS. 1,2and7, the actuating of the pivot mechanism17may be presented as follows:

The mechanism3for actuating the hoop guard2has a guide roll27via which it is raised (FIG. 2) when the chair1passes through a region with a guide device, in particular a guide rail, which is associated with the guide roll27and is arranged in the region for departing from a station. A further guide device, for example a guide rail, which moves the guide roll27back into the lowered position illustrated inFIG. 1, is arranged before or in the entrance region of the station. A rod28, which is connected to a Bowden cable29which is in turn connected to a second rod30, extends from the mechanism3for actuating the hoop guard2.

As the chair1enters a station, the support surface9is pivoted upward. When the guide roll27is lowered before or in the entrance region of a station, as inFIG. 1, then the mechanism3for actuating the hoop guard2and the Bowden cable29press the rod30downward in such a way that the device26for blocking the opening of the hoop guard2is deactivated and the hoop guard2is opened.

The rod30is connected directly or indirectly to the sheathed cable25. The sheathed cable25acts, during opening of the hoop guard2, on the pivot device17in such a manner that the control profile18is displaced in such a way (toward the right inFIGS. 5 and 6) that the bolts22of the control profile18are displaced against the upper end of the oblique portion23of the slots21of the upper profile19. Hence, the upper profile18, and thus the front edge14of the seat9, is lowered in the region of the station, whereas the pivot axis24is arranged in the region of the rear edge13of the seat part31.

As the chair1departs from the station, the guide roll27is raised, the rod30being drawn upward and the device26for closing the hoop guard2being activated. The sheathed cable25acts, during closing of the guard hoop2, on the pivot device in such a manner that the control profile18is displaced back in such a way (toward the left inFIGS. 5 and 6) that the bolts22of the control profile18are displaced against the lower end of the substantially horizontal portion22of the slots21of the upper profile19. Hence, the upper profile18, and thus the front edge14of the seat9, is raised in the region of the station, whereas the rear edge13of the seat9is arranged in a constant manner. The seat9maintains this position during travel until it enters the next station.

In summary, the exemplary embodiment of the invention is now described.

The seat surface10of a chair1of a chair lift can be pivoted with the aid of a pivot mechanism17. Thus, the seat surface can, while a passenger is sitting thereon, be pivoted in such a way that it extends so as to descend, or descend more markedly, toward the rear edge13of the seat part31. Passengers enter automatically, and independently of their size and sitting position on the chair1, into a stronger, stable back position, thereby reliably counteracting slipping in the direction of the front edge14of the seat part31and thus slipping-through between the seat surface10and transverse hoop.