A CAROUSEL FOR RAISING AND LOWERING PASSENGERS

FIELD OF THE INVENTION

The present invention relates to the technical sector concerning tourist attractions, such as for example carousels, installed in amusement parks and fairgrounds, for the entertainment of people.

In particular, the present invention relates to a carousel for raising and lowering passengers.

This type of carousel allows passengers to enjoy a fun and exciting experience as, with the passenger being raised up in the air, they offer a wider panoramic view.

DESCRIPTION OF THE PRIOR ART

A carousel for raising and lowering passengers is known, comprising a vertical support structure, in the form, for example, of a column, which is arranged on a support surface, such as for example the ground surface of an amusement park, a cabin which is conformed to house seats for the passengers and which is borne by a carriage, which is movable along the longitudinal extension axis of the vertical support structure so that, when the passengers are on board the cabin, it can be moved along the vertical support structure, for the raising and lowering of the passengers.

However, the known carousel has a large volume and can be considered a visual polluting factor in the majority of cities which accommodate an amusement park with this type of carousel.

With the aim of obviating this drawback, a carousel has been designed comprising: a support structure having a longitudinal extension axis; a base arranged so as to bear the support structure; the support structure being hinged to the base, according to a rotation axis, in such a way that the support structure is rotatable with respect to the base about the rotation axis; movement means which are arranged so as to move the support structure in rotation with respect to the base. Further, the support structure comprises a first end and a second end, which is opposite the first end and the carousel comprises: a cabin which is conformed to receive passengers and which is borne by the first end of the support structure; a counterweight element which is borne by the second end of the support structure and which is arranged for balancing the weight of the cabin with respect to the hinging point at which the support structure is hinged to the base; positioning means of the cabin for maintaining the cabin in position during the movement in rotation, about the rotation axis, of the support structure with respect to the base.

The carousel is configured so as to assume: a first configuration in which, once the support structure is moved in rotation with respect to the base, about the rotation axis in a first rotation direction, the support structure is arranged so that the first end and the base are nearing one another; a second configuration, wherein, once the support structure is moved in rotation with respect to the base, about the rotation axis in a second rotation direction which is opposite the first rotation direction, the first end and the base are moving away from one another.

This known carousel is very complex as the support structure is hinged to the base at a hinging point interposed between the first end and the second end and thus, the rotation of the support structure takes place with respect to a rotation axis which is interposed between the first end and the second end of the support structure. In other words, the support structure has a first longitudinal portion and a second longitudinal portion which extend, one opposite the other, with respect to the base. There is a consequential need to have recourse to positioning a counterweight element at the second end, i.e. the end which does not bear the cabin, so that the carousel can assume the first configuration and the second configuration without compromising the stability of the cabin.

Further, when the carousel assumes the second configuration, any movement of the passengers internally of the cabin might compromise the stability of the support structure, as the support structure maintains an inclined position with respect to the base, when it assumes both the first configuration and the second configuration.

Further, with the known carousel only the movement in rotation of the support structure with respect to the base takes place, about the rotation axis, and, therefore, the passengers will be able to enjoy only this sensory experience of movement.

SUMMARY OF THE INVENTION In the light of the above, the aim of the present invention consists in obviating the above-mentioned drawbacks.

The above aims are attained by a carousel for raising and lowering passengers according to claim 1.

The second end of the support structure is advantageously connected to the base so that the support structure is hinged to the base in such a way that, when the carousel assumes the second configuration, the support structure can emerge from the base, ensuing greater stability of the support structure and therefore of the cabin, which is borne by the first end of the support structure.

The consequence is the realisation of a less complex carousel with respect to the prior art example, as there is no need to arrange a counterweight element: in fact, the first end of the support structure bears the cabin while the second end of the support structure is connected to the base.

In this way, the visual pollution caused by the carousel is limited, since, when not in use, the carousel assumes the first configuration wherein the first end and the base are neared to one another and, therefore, the support structure and the cabin do not determine a volume that is such as to alter the profile of the surroundings.

Further, since in the second configuration the support structure emerges from the base, each tubular element of the plurality of tubular elements can slide with respect to the other in order to increase or reduce the longitudinal extension axis of the support structure and thus, for the raising and/or lowering of the cabin.

This produces a further sensory experience of movement for the passengers. BRIEF DESCRIPTION OF THE DRAWINGS:

Specific embodiments of the invention will be described in the following part of the present description, according to what is set down in the claims and with the aid of the accompanying tables of drawings, in which:

- figures 1-4 are perspective views of some parts of the carousel, of the present invention, in different configurations;

- figuresl A-4A are lateral views of the carousel, respectively of figures 1-4; - figure 5 is a view of detail W of figure 1A;

- figures 6-9 are lateral views, in larger scale, of the carousel of figures 1-4;

- figures 6A-9A are views in section, taken along sections, respectively, VI-VI of figure 6, VII-VII of figure 7, VIII-VIII of figure 8 and IX-IX of figure 9;

- figure 10 is a lateral view of the carousel, object of the present invention, when it assumes the second configuration;

- figure 11 is a section view taken along a vertical plane of figure 10. DESCRIPTION OF PREFERRED EMBODIMENTS

With reference to the appended tables of drawings, reference numeral (1) denotes in its entirety a carousel for raising and lowering passengers according to the invention. It comprises: a support structure (2) having a longitudinal extension axis (A); a base (3) arranged to bear the support structure (2); the support structure (2) being hinged to the base (3), according to a rotation axis (R), in such a way that the support structure (2) is rotatable with respect to the base (3) about the rotation axis (R); movement means (4) which are arranged so as to move the support structure (2) in rotation with respect to the base (3); the support structure (2) comprising a first end (2a) and a second end (2b), which is opposite the first end (2a) and which is connected to the base (3), and a plurality of tubular elements (5) telescopically coupled to one another in such a way as to slide with respect to one another in order to increase or reduce the longitudinal extension axis (A) of the support structure (2); a cabin (6) which is conformed to receive passengers and which is borne by the first end (2a) of the support structure (2); positioning means (7) of the cabin (6), which are conformed and predisposed to assume a first operating condition (01) in which they connect the cabin (6) and the base (3) to one another and a second operating condition (02) in which they connect the cabin (6) and the support structure (2) to one another (see figures 1-4, 1A- 4A, 6-9, 6A-9A, 10 and 11).

The carousel (1) is configured so as to assume:

- a first configuration (01) in which, once the support structure (2) is moved in rotation with respect to the base (3), about the rotation axis (R) in a first rotation direction, the support structure (2) is arranged so that the first end (2a) and the base (3) are neared to one another and the positioning means (7) assume the first operating condition (01) in such a way as to maintain the cabin (6) in position (preferably with the cabin horizontal) during the movement in rotation of the support structure (2) with respect to the base (3) (see figures 1-4, 1A, 6, 6A);

- a second configuration (C2), in which, once the support structure (2) is moved in rotation with respect to the base (3), about the rotation axis (R) in a second rotation direction which is opposite the first rotation direction (for example, starting from the carousel in the first configuration (C1 )), the support structure (2) emerges from the base (3) and the positioning means (7) assume the second operating condition (02) in such a way as to maintain the cabin (6) in position (preferably with the cabin horizontal) during the sliding of a tubular element (5a) with respect to the other tubular element (5b) of the plurality of tubular elements (5) (see figures 4, 4A, 9 and 9A).

Figure 1 and figure 4 illustrate the carousel (1), object of the present invention, respectively when it assumes the first configuration (C1) and the second configuration (C2).

Figures 2 and 3 illustrate the carousel (1), object of the present invention, when it assumes the intermediate configurations between the first configuration (C1) and the second configuration (C2).

Figure 10 illustrates the carousel (1) when it assumes the second configuration (C2) and when the tubular elements of the plurality of tubular elements (5) have been moved so as to slide one (5a) with respect to the other (5b) so as to increase the longitudinal extension axis (A) of the support structure (2).

The support structure (2), when the carousel (1) assumes the second configuration (C2), can form a column (see figures 4, 4A, 9, 9A, 10 and 11). Further, when the carousel (1) assumes the second configuration (C2), the tubular elements of the plurality of tubular elements (5) can be moved so as to slide one (5a) with respect to the other (5b) in order to increase or reduce the longitudinal extension axis (A) of the support structure (2) (see figures 10 and 11).

By base (3) is meant the lower portion of the carousel (1) having a bearing function.

The rotation axis (R) can be a horizontal rotation axis (R) (see figures 1-4 and 2A-3A).

In detail, the support structure (2) is hinged to the base (3) at two hinge points (8, 9) opposite one another (see figures 6-8).

The rotation axis (R) passes through the two hinge points (8, 9) (see figures 1- 4, 6-8).

The support structure (2) can comprise a first fixing seat (100) and a second fixing seat (100) (see figure 3A). Note that in the figures the first fixing seat is arranged at a first side of the first hinging point (8) and the second fixing seat is arranged at a first side of the second hinging point (9), though this is not strictly necessary.

Further, the carousel (1) can comprise a first piston (not illustrated) which is borne by the base (3) and which is predisposed to be moved so as to insert in or exit from the corresponding first fixing seat and a second piston (not illustrated) which is borne by the base (3) and which is predisposed to be moved so as to insert in or exit from the corresponding second fixing seat.

When the carousel (1) assumes the second configuration (C2), the first piston and the second piston can be inserted in the corresponding seats so as to couple the base (3) and the support structure (2) solidly to one another.

When the carousel (1) assumes the first configuration (C1), and the intermediate configurations up to assuming the second configuration (C2), the first piston and the second piston can be removed from the corresponding seats so that the coupling between the base (3) and the support structure (2) is such as to allow the rotation of the support structure (2) with respect to the base (3).

The movement of the first piston and the second piston can be an automatic movement as a function of a signal received from a sensor which detects the configuration assumed by the carousel (1) (not illustrated).

By cabin (6) is meant an environment of limited dimensions and designed to received passengers.

In detail, when the carousel (1) assumes the first configuration (C1), as illustrated in figures 1 and 1A, the support structure (2) is moved in rotation so that the relative longitudinal extension axis (A) assumes a horizontal orientation; while, when the carousel (1) assumes the second configuration (C2), as illustrated in figures 4 and 4A, the support structure (2) is moved in rotation so that the relative longitudinal extension axis (A) assumes a vertical orientation.

When the carousel (1) assumes the second configuration (C2), the support structure (2) emerges vertically from the base (3).

The support structure (2) is preferably hinged to the base (3) at the second end (2b) (see figures 6-8).

Advantageously, once the support structure (2) is moved in rotation with respect to the base (3), in the second rotation direction, the support structure (2) emerges from the base (3) in such a way that the longitudinal extension axis (A) is vertical.

In the same way, once the support structure (2) is moved in rotation with respect to the base (3), in the first rotation direction, the support structure (2) is arranged with respect to the base (3) in such a way that the longitudinal extension axis (A) is horizontal.

The movement means (4) can be interposed between the support structure (2) and the base (3) (see figures 6-8, 6A-8A and 9A).

The movement means (4) preferably comprise at least a piston (12) which is rotatably coupled to the base (3), at a relative end thereof, and to the second end (2b) of the support structure (2), at another relative end thereof (see figures 6-8, 6A-9A).

To the extraction movement of the cylinder from the jacket of the at least a piston (12), there advantageously corresponds a thrust force on the support structure (2) that is such as to initiate the movement in rotation of the support structure (2) with respect to the base (3), about the rotation axis (R) in a second rotation direction.

If follows that, to the insertion movement of the cylinder, in the jacket of the at least a piston (12), there corresponds a traction force on the support structure (2) that is such as to initiate the movement in rotation of the support structure (2) with respect to the base (3), about the rotation axis (R) in the first rotation direction. The at least a piston (12) can be rotatably coupled to the base (3) and to the support structure (2) by means of the spherical joints.

In detail, figures 6-8 illustrate a pair of pistons (12, 13).

Again with reference to figures 6-8), and figures 6A-9A, the base (3) comprises a first pair of eyelet attachments (14) for the rotatable coupling between each piston of the pair of pistons (12, 13) and the base (3).

In the same way, the support structure (2) comprises a second pair of eyelet attachments (15), which is arranged at the second end (2b), for the rotatable coupling between each piston of the pair of pistons (12, 13) and the support structure (2) (see figures 6-8 and figures 6A-9A).

The second pair of eyelet attachments (15) can be arranged on the lateral wall of the support structure (2) (see figures 6-8 and figures 6A-9A).

The base (3) preferably comprises a pair of covering plates (16) which are arranged to at least partially cover the second end (2b) of the support structure (2); the support structure (2) is hinged to the base (3) at each covering plate (16a) of the pair of covering plates (16) so as to be moved away from the rest surface on which the carousel (1) lies during use (see figures 1A-4A).

The rest surface on which the carousel (1) lies during use will advantageously not represent an impediment to the movement in rotation of the support structure (2) with respect to the base (3) and the carousel (1) can assume the first configuration (C1) and the second configuration (C2) without outside impediments.

In detail, the second end (2b) of the support structure (2) forms a pair of projections (20b, 21b) which are arranged opposite one another, each hinged at a covering plate (16a) of the pair of covering plates (16) (see figures 1A- 4A).

The pair of covering plates (16) can be arranged laterally with respect to the support structure (2) in such a way that each covering plate (16a) at least partially covers the lateral wall of the support structure (2) (see figures 1A-4A). The rotation axis (R) transversally crosses the pair of covering plates (16) and the support structure (2) (see figures 1-4, 6-8).

The base (3) can comprise a first slab (17) which is arranged resting on a rest surface; a second slab (18) and a third slab (19), which are arranged resting on the rest surface, which are opposite one another with respect to the first slab (17) and which are arranged transversally to the first slab (17) (see figures 1-4 and 6-9).

The pair of covering plates (16) emerge starting from the first slab (17) (see figures 1-4 and 6-9).

Alternatively, a covering plate of the pair of covering plates (16) can emerge from the second slab (18) and the other covering plate of the pair of covering plates (16) can emerge from the third slab (19) (not illustrated).

In detail, with particular reference to figures 1-4 and 6-8, the first slab (17) comprises an undercut (21) and the first pair of eyelet attachments (15) is arranged at the undercut (21) so that the at least a piston (12) can extend at least partially internally of the undercut (21).

In detail, the first pair of eyelet attachments (15) is arranged on the lateral walls of the undercut (21).

The undercut (21) can be fashioned in the thickness of the first slab (17).

In detail, the first slab (17) and the second slab (18) are arranged in such a way that the relative extension axes are perpendicular to one another.

In the same way, the first slab (17) and the third slab (19) are arranged in such a way that the relative extension axes are perpendicular to one another.

Further, the second and the third slab (19) are arranged in such a way that the relative extension axes are parallel to one another.

The first slab (17) has an extension value along the relative extension axis which is greater than the extension value along the relative extension axis of the second slab (18) and the third slab (19).

The first slab (17), the second slab (18) and the third slab (19) can be made of metal.

The cabin (6) is preferably activatable in rotation with respect to the support structure (2) so as to rotate about the longitudinal extension axis (A) of the support structure (2).

The passengers can advantageously enjoy a further sensory experience with reference to the rotation of the cabin (6) about itself, as well as the sensory experiences in relation to the above-described movements. In other words, the cabin (6) is activatable in rotation about itself.

The carousel (1) can comprise a motor (22) which is arranged at the cabin (6) for activation in rotation thereof.

The cabin (6) and the support structure (2) can be rotatably coupled to one another.

The carousel (1) preferably comprises second movement means (23) which are arranged internally of the support structure (2) in order to activate the sliding of a tubular element (5a) with respect to another tubular element (5b) of the plurality of tubular elements (5) (see figures 6A-9A).

The tubular elements of the plurality of tubular elements (5) are slidably coupled to one another.

The second movement means (23) can comprise an actuator (24) which is connected to the most external tubular element of the plurality of tubular elements (5) and to the most internal tubular element (5a) of the plurality of tubular elements (5) in such a way that, once the actuator (24) is activated, the most internal tubular element (5a) is moved slidingly and sets off the sliding of the remaining tubular elements with respect to the most external tubular element (see figures 6A-9A).

Figures 6A-9A are views in section, taken along sections, respectively, VI-VI of figure 6, VII-VII of figure 7, VIII-VIII of fig. 8 and IX-IX of fig. 9 and illustrate the carousel (1) when it assumes the first configuration (C1), the intermediate configurations and the second configuration (C2). Further, again with reference to the figures, the second movement means (23) and the plurality of tubular elements (5) are illustrated. Note that the plurality of the tubular elements (5) of the support structure (2) can be in: a relative first arrangement wherein it has a relative minimum length (figures 1-9A), in a second arrangement in which it has a relative maximum length (figures 10-11), and in a plurality of intermediate arrangements wherein it has a relative intermediate length between the maximum length and the minimum length.

With reference to figure 11 , a section view of the carousel (1) is illustrated when it assumes the second configuration (C2) and when the tubular elements of the plurality of tubular elements (5) have been moved so as to slide one (5a) with respect to the other (5b) in such a way as to extend the longitudinal extension axis (A) of the support structure (2), i.e. with the plurality of tubular elements (5) in the second relative arrangement.

The carousel (1) comprises a connecting element (25) for rotatably connecting the cabin (6) and the support structure (2) to one another. The positioning means (7) of the cabin (6) comprise a pair of rods (26) which are borne by the connecting element (25) and which are arranged opposite one another; each rod (26a, 26b) of the pair of rods (26) can be arranged in such a way that: when the positioning means (7) of the cabin (6) assume the first operating condition (01), the relative ends are rotatably coupled to the connecting element (25) and to the base (3), i.e. a first end of each rod (26a, 26b) of the pair of rods (26) is rotatably coupled to the connecting element (25) and a second end of each rod (26a, 26b) of the pair of rods (26) is coupled to the base (3) (see figures 1-4, 5).

During the rotation movement of the support structure (2) in the first rotation direction, the pair of rods (26) advantageously ensures that the cabin (6) maintains a horizontal orientation, thus avoiding any tipping of the passengers internally of the cabin (6).

In other words, during the rotation movement of the support structure (2) in the first rotation direction, the rotation of the connecting element (25) with respect to the support structure (2) is regulated by each rod (26a, 26b) of the pair of rods (26) as it is rotatably coupled to the connecting element (25) and to the base (3).

The rods (26a, 26b) of the pair of rods (26) can be arranged opposite one another with respect to the connecting element (25).

The connecting element (25) and the first end (2a) of the support structure (2) are rotatably coupled to one another.

Figure 5 illustrates the connecting element (25) and a part of a rod (26a) of the pair of rods (26).

The base (3) can comprise a pair of seats (27) for receiving the free end of each rod (26a, 26b) of the pair of rods (26) (see figures 10 and 11 in which the plurality of tubular elements (5) is in the relative second arrangement). The free end of each rod (26a, 26b) of the pair of rods (26) is the second end of each rod (26a, 26b) of the pair of rods (26) and is free, i.e. decoupled from the base (3) when the positioning means (7) of the cabin (6), assume the second operating condition (02). This can be observed in figures 4, 4A, 9A, 10 and 11.

The pair of seats (27) can be made at the pair of covering plates (16) (see figures 4, 4A, 10 and 11).

When the positioning means (7) assume the first operating condition (01), the second end of the rods (26a, 26b) of the pair of rods (26) is received in the corresponding seat of the pair of seats (27).

Each rod (26a, 26b) of the pair of rods (26) can comprise a through-hole (28) at the relative second end, i.e. the relative free end of each rod (26a, 26b) of the pair of rods (see figures 4, 4A, 10 and 11 when the positioning means (7) of the cabin (6) assume the second operating condition (02).

The carousel (1) can comprise a third piston (29) which is borne by the base (3) and which is predisposed to be moved in such a way as to insert in or exit from the corresponding seat of the pair of seats (27) and the corresponding through-hole (28) of a rod (26a) of the pair of rods (26) (see figures 6 and 7 where the positioning means (7) of the cabin (6) assume the first operating condition (01)).

Likewise, the carousel (1) can comprise a fourth piston (30) which is borne by the base (3) and which is predisposed to be moved in such a way as to insert in or exit from the corresponding other seat of the pair of seats (27) and the corresponding through-hole (28) of the other rod (26b) of the pair of rods (26) (see figures 6 and 7 where the positioning means (7) of the cabin (6) assume the first operating condition (01)).

When the positioning means (7) of the cabin (6) assume the first operating condition (01), the third piston (29) and the fourth piston (30) can be insertable (and preferably are inserted) internally of the corresponding seat of the pair of seats (27) and internally of the corresponding through-hole (28) of the rods (26a, 26b) of the pair of rods (26) (see figures 6 and 7).

When each rod (26a, 26b) of the pair of rods (26) has a fixed length, the insertion or exit of the third piston (29) and the fourth piston (30), can take place when the positioning means (7) of the cabin (6) assume the first operating condition (01) and the plurality of tubular elements of the support structure is in the first arrangement.

When each rod (26a, 26b) of the pair of rods (26) has a variable length (as it is, for example, telescopic and it has a maximum length at least at the length of the plurality of tubular elements of the support structure is in the second arrangement), the insertion or exit of the third piston (29) and the fourth piston (30), can take place when the positioning means (7) of the cabin (6) assume the first operating condition (01) and the plurality of tubular elements (5) of the support structure (2) is in any one of the preceding claims, i.e. in the first arrangement, in the second arrangement or in one of the arrangements of the plurality of intermediate arrangements.

Therefore, it is not necessary that, when the positioning means (7) of the cabin (6) assume the second operating condition (02), the second end of each rod (26a, 26b) of the pair of rods (26) is decoupled from the base (3).

Obviously, for reasons of volume and in consideration of the lever rule, it is preferable for each rod (26a, 26b) of the pair of rods (26) to have a fixed length.

An embodiment of the carousel (1) of the invention is preferred in which the plurality of the tubular elements (5) of the support structure (2) can be arranged in a relative first arrangement in which it has a relative minimum length and in which, when the positioning means (7) of the cabin (6) assume the first operating condition (01), the further piston (29) is inserted in the corresponding seat of the pair of seats (27) and in the corresponding through- hole (28) of a rod (26a) of the pair of rods (26); and the still further piston (30) is inserted in the corresponding other seat of the pair of seats (27) and in the corresponding through-hole (28) of the other rod (26b) of the pair of rods (26). According to this embodiment, each rod (26a, 26b) of the pair of rods (26) can have a relative fixed length. Therefore, in this case it is necessary that, when the positioning means (7) of the cabin (6) assume the second operating condition (02), the second end of each rod (26a, 26b) of the pair of rods (26) is decoupled from the base (3). Obviously, for reasons of volume and in consideration of the lever rule, it is preferable for each rod (26a, 26b) of the pair of rods (26) to have a fixed length.

Preferably, and alternatively to the foregoing, the projection (31) of each rod (26a, 26b) of the pair of rods (26) extends transversally to the extension axis of each rod (26a, 26b) and is arranged in such a way that: when the positioning means (7) of the cabin (6) assume the second operating condition (02), a relative end is rotatably coupled to the connecting element (25) and the projection (31) is solidly coupled to the support structure (2) and, more preferably, to the most external tubular element (5) of the plurality of tubular elements (5) of the support structure (2) (see figures 10 and 11). Further, and preferably, the second end of each rod (26a, 26b) of the pair of rods (26) is decoupled from the base (3), as can be observed in figures 4A, 9A, 10 and 11, in which the end is free, i.e. decoupled from the base (3).

Note that by the terms “a relative end is rotatably coupled to the connecting element (25)” it is meant that the first end of each rod (26a, 26b) of the pair of rods (26) is rotatably coupled to the connecting element (25).

By the terms “alternatively to the foregoing”, mentioned in the foregoing, and as easily intuitable also from the figures, is meant the following: “alternatively to when the positioning means (7) of the cabin (6) assume the first operating condition (01)”, i.e. when the positioning means (7) of the cabin (6) assume the second operating condition (02).

Advantageously, during the sliding movement of one tubular element (5a) with respect to the other tubular element (5b) of the plurality of tubular elements (5) when the positioning means (7) of the cabin (6) assume the second operating condition (02), the pair of rods (26) and the relative projection (31) ensure that the cabin (6) maintains a horizontal orientation, thus avoiding any tipping of the passengers internally of the cabin (6).

In other words, during the sliding of a tubular element (5a) with respect to the other tubular element (5b) of the plurality of tubular elements (5), the rotation of the connecting element (25) with respect to the support structure (2) is prevented because of the projection (31), as it is solidly coupled to the support structure (2).

The projection (31) can comprise a seat (32) (see figures 10 and 11).

The carousel (1) can comprise a fifth piston (33) which is borne by the support structure (2) and which is predisposed to be moved in such a way as to insert in or exit from the corresponding seat (32) of the projection (31) (see figures 10 and 11).

When the positioning means (7) assume the second operating condition (02), the fifth piston (33) is inserted in the corresponding seat (32) of the projection

(31) (see figures 10 and 11). The same considerations as in the foregoing for the projection (31), the seat

(32) of the projection (31) and the fifth piston (33) are also valid for each rod (26a, 26b) of the pair of rods (26).