Hydrant

Abstract

A hydrant (10) comprising an upper part (14) provided with at least one connection (16) and a lower part (22) which has a connection (24) for an inlet pipe (26), a riser pipe casing (42) and a riser pipe (44) guided in the riser pipe casing (42) and supporting the upper part (14), which is movable out of the riser pipe casing (42) and can be positioned at different heights relative to the riser pipe casing (42), characterized in that at least one threaded area (52a, b) extending in a strip shape both in the longitudinal direction (L) and in the circumferential direction (U) of the riser pipe (44) is arranged on its outer circumferential side (50), that at least one threaded engagement (76) held on the riser pipe casing (42) engages in the at least one threaded area (52a, b) to determine a height setting of the riser pipe (44) relative to the riser pipe casing (42), and that a Twisting the riser pipe (44) with the at least one threaded section (52a,b) and the at least one threaded engagement (76) relative to each other enables a height adjustment of the riser pipe (44) relative to the riser pipe shell (42).

Description

[0001] The invention relates to a hydrant comprising an upper part provided with at least one connection and a lower part which includes a connection for an inlet pipe, a riser pipe casing and a riser pipe guided in the riser pipe casing and supporting the upper part, which is movable out of the riser pipe casing and can be positioned at different heights relative to the riser pipe casing.

[0002] Such hydrants are known from the prior art, but the problem with these is to be able to adjust the height of the upper part as precisely and easily as possible. Document DE 100 28 655 A1 discloses a hydrant according to the preamble of claim 1.

[0003] This problem is solved in a hydrant according to claim 1 by arranging at least one threaded area extending in a strip-like manner both longitudinally and circumferentially on the riser pipe at its outer circumferential side, in order to determine a height setting of the riser pipe relative to the riser pipe shell, a threaded engagement held by the riser pipe shell engages in the at least one threaded area, and in that a rotation of the riser pipe with the at least one threaded area and the at least one threaded engagement relative to each other enables a height setting of the riser pipe relative to the riser pipe shell.

[0004] The advantage of the solution according to the invention is that by providing the threaded area, a simple way is created to position the riser pipe relative to the riser pipe shell easily and precisely.

[0005] In order to make the riser pipe height-adjustable over the largest possible range, it is preferably provided that the at least one threaded area extends in the longitudinal direction of the riser pipe substantially over a height adjustment range of the riser pipe.

[0006] In particular, it is provided that the height adjustment range of the riser tube corresponds to the maximum extension distance by which the riser tube can be extended from the riser tube casing from the position maximally inserted into the riser tube casing.

[0007] In principle, the threaded area could extend circumferentially over the entire circumference of the outer side, so that it could have closed circumferential threads.

[0008] However, it is particularly advantageous if the threaded area extends in the circumferential direction of the outer circumferential side over an arc segment around a central axis of the riser pipe and, in particular, thus extends only over a partial circumference of the outer circumferential side.

[0009] Such a limitation of the thread area has the advantage that only a limited rotation of the riser pipe is required to adjust it.

[0010] In this case, height adjustment can be achieved, for example, by making the at least one threaded engagement, in particular azimuthally, movable towards the outer circumference in order to engage it with different positions of the threaded area in the longitudinal direction of the riser pipe.

[0011] One advantageous solution provides that at least one threaded area has thread segments that circumferentially surround the central axis of the riser pipe.

[0012] However, one particularly advantageous solution provides that the thread segments extend around the central axis of the riser pipe over an arc segment that corresponds to the circumferential extent of the thread area.

[0013] In particular, the arc segments are chosen to be smaller than 360°.

[0014] In particular, the thread segments are designed such that they extend from a first end to a second end and that the ends are located in the area of ​​longitudinal sides of the thread area which extends in a strip-like manner in the longitudinal direction of the riser pipe.

[0015] The solution of the invention for adjusting the height of the riser pipe provides that at least one strip-shaped, unthreaded area extending both in the longitudinal direction and in the circumferential direction of the riser pipe is arranged on the outer circumferential side of the riser pipe, adjoining the at least one threaded area, and which, when facing the at least one threaded engagement, is freely movable relative to the threaded engagement for adjusting the height of the riser pipe.

[0016] Such a threadless area has the advantage that it makes it possible to make a coarse adjustment of the height of the riser pipe and then, starting from the coarse adjustment, to achieve a fine adjustment of the riser pipe using the threaded area with the thread engaging into it.

[0017] With regard to the design of the thread segments in such a case, it is preferably provided that the thread segments transition into the thread-free area at an open end, thus allowing movement of the thread engagement from the respective thread segment into the thread-free area and vice versa.

[0018] In principle, the thread segments could be open at both ends, thus allowing a transition from the threaded area to a threadless area and vice versa.

[0019] For adjustability, it has proven particularly advantageous if the thread segments are closed at an end opposite the open end, thus preventing the thread engagement from moving out of the respective thread segment at this end.

[0020] This has the advantage that it only allows the riser pipe to be rotated so that the thread engagement is effective in one of the thread segments of the threaded area, or is out of engagement with the thread segments of the threaded area in the threadless area, in order to make a coarse adjustment of the riser pipe, in order to then be moved into another thread segment.

[0021] Preferably, it is provided that when the riser pipe is rotated in such a way that the thread engagement in the respective thread segment moves from the open end to the closed end, the riser pipe moves upwards relative to the riser pipe shell.

[0022] It is particularly advantageous if the thread segments of the thread area have such a pitch that, when the thread engages completely into a thread segment at the open end, the riser pipe is at least at the same height as when the thread engages into the next thread segment in the vertical direction at the closed end.

[0023] A particularly advantageous solution provides that at least two threaded areas, offset relative to each other in the circumferential direction, are arranged on the outer circumferential side of the riser pipe.

[0024] This has the advantage that it makes it possible to provide several, for example at least two, thread engagements, with each thread engagement engaging in one of the thread areas.

[0025] Furthermore, in order to make the coarse adjustment of the riser pipe easy, it is provided that a threadless area is arranged on the outer circumferential side of the riser pipe between the threaded areas, so that it is easy to allow the thread engagement to engage in a threaded area or to position it in a threadless area.

[0026] Furthermore, it is preferably provided that the threaded areas and the unthreaded areas are formed adjacent to each other in the circumferential direction on the outer circumferential side of the riser pipe, so that it is possible to easily rotate the riser pipe in such a way that the thread engagement which engages in a threaded area can also be moved in a unthreaded area.

[0027] A particularly advantageous solution provides that a threaded area is arranged on opposite sides of the outer circumference of the riser pipe, and in this case, preferably, a threadless area is provided between the threaded areas.

[0028] When providing at least two threaded areas, it is advantageous to arrange the thread segments of the at least two threaded areas relative to each other on the outer circumferential side in such a way that each thread engagement can be brought into engagement with a thread segment of one of the threaded areas and the thread segments that are simultaneously engaged with a thread engagement contribute to fixing the riser pipe relative to the riser pipe shell.

[0029] A solution has proven particularly advantageous in which the thread segments of the threaded areas, which simultaneously contribute to fixing the riser pipe relative to the riser pipe shell, lie with their first ends and their second ends in the same plane perpendicular to the central axis of the riser pipe, that is, that the first ends lie in the same plane and the second ends also in the same plane, but offset from the plane of the first ends in the longitudinal direction of the riser pipe.

[0030] No further details have yet been provided regarding the arrangement of the at least one threaded engagement relative to the riser pipe shell. One advantageous solution provides that the at least one threaded engagement is arranged on a retaining flange held to the riser pipe shell.

[0031] The retaining flange can be designed in a wide variety of ways.

[0032] One advantageous solution provides that the retaining flange is held on a support flange that is firmly connected to the riser pipe casing.

[0033] Advantageously, the retaining flange is provided to be detachably held on the support flange in order to easily mount the retaining flange on the riser pipe casing.

[0034] In particular, the mounting of the retaining flange can be easily achieved if the retaining flange comprises two flange halves, each of which has a threaded engagement.

[0035] However, the flange halves can each have more than one threaded engagement.

[0036] The flange halves can also be used to apply pressure ring segments, with which the riser pipe can be fixed to the outer circumferential surface in a force-fit manner and, in particular, rotationally fixed relative to the riser pipe shell.

[0037] For this purpose, it is preferably provided that the pressure ring segments can be subjected to force through the flange halves in the direction of the outer circumferential surface of the riser pipe.

[0038] The pressure ring segments can be designed in a variety of ways. For example, they can be circular ring segments in cross-section that can be easily attached to the outer circumferential surface of the riser pipe.

[0039] However, for the force-fit fixing of the riser pipe, it has proven advantageous if the pressure ring segments are designed as wedge bodies which have wedge surfaces, when acted upon by pressure surfaces of the flange halves a force effect of the wedge bodies radial to the outer circumferential surface and in particular in the direction of the support flange occurs, in order to achieve in a simple way an advantageous force fit between the support flange and the outer circumferential surface of the riser pipe.

[0040] In particular, it is provided that each flange half has a clamping shell body which carries the thread engagement.

[0041] Furthermore, it is preferably also provided that each flange half has a clamping shell body which acts on at least one pressure ring segment.

[0042] To fix the flange halves to the support flange, each flange half is provided with a retaining element.

[0043] In order to advantageously fix the flange halves to the support flange of the riser pipe shell, it is preferably provided that the respective retaining body is designed to encompass the support flange of the riser pipe shell.

[0044] In particular, the respective holding body is designed in such a way that it engages the support flange on a side facing away from the respective clamping shell body.

[0045] Furthermore, to prevent the retaining flange from twisting relative to the support flange, it is preferably provided that the respective retaining body can be connected to the support flange in a rotationally fixed manner by means of a positive locking mechanism.

[0046] Furthermore, in order to achieve a backlash-free fixation of the retaining flange to the support flange, it is preferably provided that the respective retaining body engages the support flange without backlash by the interaction of the flange halves with the pressure ring segments.

[0047] This is particularly the case when the pressure ring segments are designed in such a way that their wedge bodies exert a force radially to the outer circumferential surface of the riser pipe and in the direction of the support flange, so that the reaction on the flange halves moves them in such a way that the retaining bodies engage behind the support flange without play, i.e., on a side facing away from the respective clamping shell body, they rest against the support flange without play.

[0048] No further details have yet been provided regarding the joining of the flange halves.

[0049] One advantageous solution provides that the flange halves can be actuated by clamping units and thus moved towards each other in the direction of the riser pipe.

[0050] To prevent the flange halves from detaching from the support flange when the clamping units are released, it is preferably provided that the clamping units only allow the flange halves to be released from each other in such a way that they remain inseparably, and in particular rotationally fixed, connected to the support flange.

[0051] This allows the riser pipe to be rotated relative to the pressure ring segments and relative to the retaining flange and the riser pipe shell, but prevents the flange halves and thus also the retaining flange from being detached from the support flange.

[0052] Further features and advantages of the invention are the subject of the following description and the graphic representation of some exemplary embodiments. The drawing shows: Fig. 1 shows an overall view of a hydrant according to the invention with an upper part rising above the ground surface and a lower part arranged below the ground surface; Fig. 2 shows a side view of the lower part similarly. Fig. 1 with the riser pipe fully inserted; Fig. 3 shows a side view accordingly. Fig. 2 with the riser pipe fully extended; Fig. 4 a partial view of the riser pipe similar to Fig. 3 with threaded areas arranged on both sides of a threadless area; Fig. 5 a side view of the riser tube rotated by 90° showing a view of a threaded area; Fig. 6 a section along line 6-6 in Fig. 4 through the riser pipe; Fig. 7 a side view of the riser pipe casing and the riser pipe with the retaining flange shown in section in the plane of the drawing; Fig. 8 a perspective view of one flange half of the retaining flange; Fig. 9 a top view of the flange half of the retaining flange according to Fig. 8 ; Fig. 10 a side view of one flange half of the retaining flange according to Fig. 8 Fig. 11 shows a side view of the riser pipe casing and the riser pipe connected by a retaining flange shown in its entirety, with the riser pipe rotated such that the threaded engagements face the respective unthreaded area; Fig. 12 shows a corresponding representation Fig. 11 when the riser pipe is rotated relative to the riser pipe shell such that the thread engagements engage in a thread segment of the illustrated thread area; Fig. 13 a partial view of, for example, three thread segments of a thread area in development with a representation of possible end positions of a thread engagement engaging in a thread segment; Fig. 14 a side view of the riser pipe shell and riser pipe with flange halves and pressure ring segments shown separated in the plane of the drawing; Fig. 15 a view of a sectional view along line 15-15 in Fig. 14 Fig. 16 shows a partial sectional view through one flange half in its position acting on the respective pressure ring segment, and Fig. 17 shows a similar view. Fig. 15 in the case of flange halves clamped together for the force-fit fixing of the riser pipe relative to the riser pipe shell.

[0053] An embodiment of a hydrant 10 according to the invention, shown in Fig. 1 , comprises an upper part 14 of the hydrant 10 rising above a ground surface 12, which can be an earth surface or road surface, which is provided with, for example, a connection 16 and also with an actuation 18 for a main connection valve not shown in the drawing.

[0054] Below the base surface 12 is a lower part 22 of the hydrant 10, which has a connection 24 that is connected to an inlet pipe 26 and a curved body 32 following the connection 24, which leads to a valve housing 34 of the main shut-off valve.

[0055] The valve housing 34 is followed by a riser pipe arrangement 40, comprising a riser pipe jacket 42, which accommodates a riser pipe 44, which is height-adjustable and extendable from the riser pipe jacket 42 and has a mounting flange 46 on which the upper part 14 is mounted.

[0056] The riser pipe 44 is designed to be variably height-adjustable relative to the riser pipe shell 42 in order to position the mounting flange 46 as precisely as possible at the height of the base surface 12, so that a course of the inlet pipe 26 at different depths relative to the base surface can be compensated for.

[0057] That's how it is, as in Fig. 2 As shown, the riser pipe 44 can be inserted essentially completely into the riser pipe casing 42 or, as in Fig. 3 shown, extendable to a maximum extent from the riser pipe casing 42, whereby the different position of the mounting flange 46 above the connection 24 is evident once in the maximally inserted position according to Fig. 2 and once in the fully extended position in Fig. 3 The achievable height variability of the riser pipe arrangement is 40.

[0058] To fix the riser tube 44 relative to the riser tube casing 42, the riser tube 44 is, as in Fig. 4 , 5 and 6 shown, on opposite outer circumferential sides 50 provided with threaded areas 52a and 52b which do not have threads circumferential around the outer circumferential side 50 but thread segments 54.

[0059] The threaded areas 52a, b extend in a strip-like fashion in the longitudinal direction L of the riser pipe 44, in particular over its entire length in the longitudinal direction L, in the maximally extended state according to Fig. 3 from the riser pipe casing 42 to the mounting flange 46 and have an extension in the circumferential direction U of the riser pipe 44 between longitudinal sides LS extending in the longitudinal direction L over an angular range WGS ( Fig. 6 ).

[0060] Between the threaded areas 52a, b, strip-shaped, circumferentially viewed, also extending in the longitudinal direction L of the riser pipe 44 and also arranged on the outer circumferential side 50, are threadless areas 56a, b in which, as in Fig. 6 As shown, an outer surface 58 of the riser pipe 44 extends at a radial distance from a central axis 60 of the same, which corresponds approximately to a radial distance of a base surface 62 of the threads 54 in the thread regions 52a, 52b, wherein the thread regions 52a, b have outer surfaces 64 lying between successive threads 54, which extend around the central axis 60 with a radius increased by one depth of the threads 54 relative to the base surfaces 62 of the threads 54.

[0061] In particular, the threaded areas 52a, b and the threadless areas 56a, 56b alternate in a strip-like fashion in the longitudinal direction L with each having a constant extent over the angular ranges WGS and WGF respectively in the circumferential direction U around the central axis 60, so that the circumferential thread segments 54a, 54b are interrupted by the outer surfaces 58 of the threadless areas 56a, b.

[0062] As further in Fig. 4 bis Fig. 6 It can be seen that the thread segments 54a, 54b of the thread areas 52a, 52b are closed at a first end 53 to the adjacent threadless area 56b, 56a and are only open at a second end 55 to the adjacent threadless area 56a, 56b.

[0063] For this purpose, the thread segments 54a, 54b at the first end are limited at a distance from the thread-free area 56b, 56a by a termination wall 66 rising above the base surface 62 to the outer surface 64, while the thread segments 54a, b at the second end 55 with their base surfaces 62 transition into the outer surfaces 58 of the respective thread-free area 56a, 56b.

[0064] Preferably the thread segments 54a, 54b extend in the circumferential direction U around the central axis 60 over an angular range WGS which is approximately twice the angular range WGF over which the threadless areas 56a, 56b extend.

[0065] To fix the riser pipe 44 relative to the riser pipe casing 42, as shown in Fig. 7 and Fig. 10 As shown, at one end of the riser pipe casing 42 opposite the valve housing 34, a support flange 72 is integrally formed on it and projects radially beyond it, against which a retaining flange, designated as a whole by 70, is supported, which is formed from two flange halves 74a and 74b and which each, as in Fig. 7 bis 10 shown, are provided with threaded engagements 76 which project radially inwards relative to a contact surface 78 of the same, wherein the contact surface 78 is designed such that it can be applied to the outer circumferential surfaces 64 between the thread turns 54 in the thread areas 52a, b.

[0066] The thread engagements 76 extend over an angular range WE in the circumferential direction around the central axis 60 of the riser pipe 44, which is smaller than, or at most equal to, the angular range WGF of the threadless areas 56a, 56b.

[0067] Furthermore, the threaded engagements 76 are located with the retaining flange 70 effectively arranged, as shown in Fig. 7 shown, arranged exactly opposite each other, in the same way as the threadless areas 56a, 56b.

[0068] Thus, as in the Fig. 11 As shown, on the one hand, the riser pipe 44 is rotated relative to the retaining flange 70 so that the threaded engagements 76 face the threadless areas 56, so that the riser pipe 44 is freely displaceable relative to the riser pipe shell 42 in the direction of the central axis 60, since the threaded engagements 76 are arranged opposite the outer surfaces 58 which run at a distance from the threaded engagements 76.

[0069] This makes it possible to freely adjust the riser tube 44 relative to the riser tube casing 42.

[0070] The riser pipe 44 can also be used, as shown in Fig. 12 As shown, rotate so that the thread engagements 76 lie in the thread areas 52 and thus each engage in one of the thread segments 54 and thereby fix the riser pipe 44 relative to the retaining flange 70 in the respective rotational position relative to the riser pipe shell 42.

[0071] This allows for fine adjustment of the height of the riser pipe 44 relative to the riser pipe casing 42 by rotating the latter, so that the respective thread engagement 76 still engages within the thread area 52 in one of the thread segments 54 and, by rotating the riser pipe 44 along this one thread segment 54, in different positions, which according to Fig. 13 specifying a different height of the riser pipe 44, which can be positioned.

[0072] Because the thread segments 54a, b are closed on one side, each of the thread engagements 76a, b can only be moved circumferentially in a corresponding thread segment 56a, b of the respective thread area 52a, b for fine adjustment in the circumferential direction of the riser pipe 44 and can be moved from the respective thread segment 56a, b into the threadless area 56a, b adjoining the open end for coarse adjustment of the riser pipe 44.

[0073] The closed end of the respective thread segments 54a, b facilitates the operation of the riser tube 44 during height adjustment, as an operator can be sure, when turning in one direction, to turn the thread engagements 76a, b into the thread segments 54a, b up to the closed end 53 at most, and when turning in the opposite direction, to turn the thread engagements 76a, b first into the thread segments 54a, b and then at the open end 55 out of the thread segments 54a, b into the respective unthreaded area 56a, b.

[0074] It is particularly advantageous if the thread segments 54a, b have a pitch which, when the riser tube 44 is rotated so that the thread engagement 76 moves from a starting position at the open end 55 to a final position at the closed end 53 of the respective thread segment 54o, results in a height adjustment of the riser tube 44, with each complete engagement of this thread engagement 76 in the respective thread segment 54a, which is at most a height that corresponds, in the direction of the central axis 60, to the height of the riser tube 44 that it would have if the thread engagement 76 were to engage in the next thread segment 54u in the height direction below the thread segment 54o in the starting position at the open end 55, as in Fig. 13 depicted.

[0075] In other words, the thread engagement 76 in the initial position at one of the thread segments 54 positions the riser pipe 44 at least at the same height as would be achieved if the thread engagement 76 were to engage in the next thread segment 54o in the height direction in the final position.

[0076] For this purpose, the thread segments 54a, b in the thread areas 52a, b are arranged such that the first ends 53 of corresponding thread segments 54a, b lie in the same plane E1 perpendicular to the central axis 60 of the riser pipe 44 and the second ends 55 of corresponding thread segments 54a, b lie in the same plane E2 perpendicular to the central axis 60 but offset relative to the plane E1.

[0077] The distance between planes E1 and E2, for example, is in the range of 20 mm to 60 mm.

[0078] Thus, the thread engagements 76a, b, which engage in these thread segments 54a, b, can be at the same height in the direction of the central axis 60.

[0079] Thus, the areas of the thread segments 54a, b, into which the thread engagements 76a, b engage, are also at the same height in the direction of the central axis 60.

[0080] As in Fig. 14 and 15 As shown, the flange halves 74a and 74b sit loosely on the support flange 72 of the riser pipe shell 42 and comprise, on the one hand, clamping shell bodies 82a and 82b, which have, on the one hand, the contact surfaces 78 and, on the other hand, the thread engagements 76 projecting from the contact surfaces 78.

[0081] These clamping shell bodies 82a, b are integrally formed with retaining shell bodies 84a and 84b, which are provided, on the one hand, with support surfaces 86, with which they are able to support themselves on a bearing side 88 of the support flange 72 facing away from the riser pipe shell 42, and, on the other hand, are provided with undercuts 94 that laterally encompass the support flange 72 and engage under it on a bottom surface 92 facing the riser pipe shell 42, which can be applied with undercut surfaces 96 on the bottom surface 92.

[0082] As in Fig. 15 As shown, the support flange 72 for the rotationally fixed fixing of the flange halves 74a, 74b of the retaining flange 70 comprises flattened surfaces 104a, 104b that deviate from and are recessed relative to a circular outer contour 102 of the support flange, against which the flange halves 74a, b also bear with flat sides 106a, b formed in the retaining shell bodies 84, so that the two flange halves 74a, b and thus also the retaining flange 70 can be fixed rotationally fixed relative to the support flange 72 of the riser pipe shell 42, as shown in the Fign. 8, 10 , 14 and 15 depicted.

[0083] Furthermore, between the contact surface 78 of the clamping shell bodies 82a, b and the respective retaining shell bodies 84a, b, a pressure surface 108 extends conically from the contact surface 78, which interacts with a similarly conically extending wedge surface 112 of wedge bodies 114 designed as pressure ring segments 110a, b, which are arranged as in Fig. 16 As shown, the flange halves 74a, b are supported on the one hand at the bearing surface 88 of the support flange 72 of the riser pipe shell 42 and on the other hand in the threaded areas 52a, b on the outer surface 64. Due to the wedge surface 112, which acts on the pressure surface 108, a force acting radially towards the riser pipe 44 when the flange halves 74a, b are clamped together causes the flange halves 74a, b, in particular with the clamping shell bodies 82a, b, to move away from the support flange 72 and, if necessary, to lift slightly from the bearing surface 88 with the support surface 86. The retaining shell bodies 84a, b of the flange halves 74a, b come into contact with the undercut surfaces 96 on the underside 92 of the support flange 72, as shown in Fig. 15 shown, and in particular the undercut surfaces 96 lying on both sides of the flat sides 106 come into effect.

[0084] This results in the riser pipe 44 being radially actuated by the radial clamping surfaces 116 of the wedge bodies 114 and, on the other hand, the riser pipe being radially actuated in the area of ​​the outer surfaces 64 by the clamping shell bodies 82 and thus being fixed in a force-fit manner relative to the retaining flange 70, which in turn is fixed in a form-fit manner to the support flange 72 due to the flattened surfaces 104a, b and the flat discs 106a, b and is also fixed in a force-fit manner to the support flange 72 due to the force-fit between the undercut surfaces 96 and the underside 92 of the support flange 72.

[0085] To clamp the flange halves 74a, b of the retaining flange 70, as shown in Fig. 17The flange halves are shown to be provided with bearing bodies 122 integrally formed on the clamping shell bodies 82a, b and the retaining shell bodies 84a, b, which have receptacles 124, for example in the form of bores, which are penetrated by clamping units 126, wherein these clamping units 126 are, for example, combinations of screws 132 and nuts 134, which each act on the bearing bodies 122 of the flange halves 74a,b in order to move them towards each other and thus clamp them relative to each other.

[0086] By loosening the clamping units 126, it is then possible to release the rotationally fixed fixing of the riser pipe 44, in particular by frictional engagement in the area of ​​the wedge bodies 114 and the clamping shell bodies 82, and thus to allow rotation of the riser pipe 44 in order to either rotate it so that the threadless areas 56a, b face the thread engagements 76 of the flange halves 74a, b, so that the riser pipe 44 is freely movable relative to the riser pipe shell 44, or to rotate it so that the thread engagements 76 engage in the thread segments 54a, b of the threaded areas 54a, b in order to enable fine adjustment of the riser pipe 44 relative to the riser pipe shell 42 by utilizing the pitch of the thread segments 54.

[0087] After adjusting the height of the riser pipe shell 44, in particular its mounting flange 46 relative to the base surface 12, the flange halves 74a, b are clamped relative to each other by means of the clamping units 126 and thus the riser pipe 44 is fixed in a rotationally fixed position relative to the riser pipe shell 42, so that it can no longer be rotated and, due to the thread engagements 76 which engage in a thread segment 54 of the thread areas 52a, b, it is also additionally positively locked in its relative position to the riser pipe shell 42.

[0088] To prevent the clamping units 126 from being loosened to such an extent that the flange halves 74a, b can detach from the support flange 72, the clamping units 126 can only be loosened to a position in which the flange halves 74a, b are still fixed to the support flange 72 in a way that prevents detachment and rotation.

[0089] This is done, for example, by means of locking elements 136, which in the case of screws 132 and nuts 134 are locking elements 136, for example pins, which allow the screws 132 and nuts 134 to be loosened to a maximum loosening position.

Claims

1. Hydrant (10) comprising an upper portion (14) which is provided with at least one connection (16) and a lower portion (22) which has a connection (24) for a supply pipe (26), a riser pipe cover (42) and a riser pipe (44) which is guided in the riser pipe cover (42), carries the upper portion (14), can be moved out of the riser pipe cover (42) and is positioned at different heights relative to the riser pipe cover (42), wherein on the riser pipe (44) at the outer circumferential side (50) thereof at least one thread region (52a, b) which extends in a strip-like manner both in the longitudinal direction (L) and in the circumferential direction (U) of the riser pipe (44) is arranged, wherein in order to secure a height adjustment of the riser pipe (44) relative to the riser pipe cover (42) at least one thread engagement (76) which is retained on the riser pipe cover (42) engages in the at least one thread region (52a, b) and wherein a rotation of the riser pipe (44) with the at least one thread region (52a, b) and the at least one thread engagement (76) relative to each other enables a height adjustment of the riser pipe (44) relative to the riser pipe cover (42), characterised in that at the outer circumferential side (50) of the riser pipe (44) there is arranged at least one thread-free region (56a, b) which adjoins the at least one thread region (52a, b) and which extends in a strip-like manner both in the longitudinal direction of the riser pipe (44) and in the circumferential direction of the riser pipe (44) and which, when it faces the at least one thread engagement (76), can be freely moved in order to adjust the height of the riser pipe (44) relative to the thread engagement.

2. Hydrant according to claim 1, characterised in that the at least one thread region (52a, b) extends in the longitudinal direction (L) of the riser pipe (44) substantially over a height adjustment range of the riser pipe (44), in that in particular the height adjustment range of the riser pipe (44) corresponds to the maximum extension distance with which the riser pipe (44) starting from the position retracted to the maximum extent in the riser pipe cover (42) can be pulled out of the riser pipe cover (42) to the maximum extent.

3. Hydrant according to either of the preceding claims, characterised in that the at least one thread region (52a, b) extends in the circumferential direction of the outer circumferential side (50) over a curve segment (WGS) about the centre axis (60) of the riser pipe (44).

4. Hydrant according to any one of the preceding claims, characterised in that the at least one thread region (52a, b) has thread turn segments (54a, b) which extend around the centre axis of the riser pipe (44), in that in particular the thread turn segments (54a, b) extend around the centre axis (60) of the riser pipe (44) over a curve segment (WGS) which corresponds to the extent of the thread region (52a, b) in the circumferential direction.

5. Hydrant according to claim 4, characterised in that the thread turn segments (54a, b) extend from a first end (53) up to a second end (55) and in that the ends (53, 55) are located in the region of longitudinal sides of the thread region (52a, b) which extends in a strip-like manner in the longitudinal direction of the riser pipe (44).

6. Hydrant according to claim 4 or 5, characterised in that the thread turn segments (54a, b) at an open end (55) merge into the thread-free region (56a, b) and consequently permit a movement of the thread engagement (76) out of the respective thread turn segment (54a, b) into the thread-free region (56a, b) and vice versa).

7. Hydrant according to claim 6, characterised in that the thread turn segments (54a, b) are closed at an end (53) opposite the open end (55) and consequently at this end (53) prevent a movement of the thread engagement (76) out of the respective thread turn segment (54, b).

8. Hydrant according to any one of the preceding claims, characterised in that at the outer circumferential side (50) of the riser pipe (44) at least two thread regions (52a, b) which are offset relative to each other in the circumferential direction are arranged, in that in particular at the outer circumferential side (50) of the riser pipe (44) between the thread regions (52a, 52b) a thread-free region (56a, 56b) is arranged in each case, in that in particular at the outer circumferential side (50) of the riser pipe (44) the thread regions (52a, b) and the thread-free regions (56a, b) are constructed to adjoin each other in the circumferential direction.

9. Hydrant according to any one of the preceding claims, characterised in that at the outer circumferential side (50) of the riser pipe (44) a thread region (52a, b) is arranged in each case at mutually opposing sides.

10. Hydrant according to either claim 8 or claim 9, characterised in that the thread turn segments (54a, b) of the at least two thread regions (52a, b) are arranged relative to each other on the outer circumferential side (50) in such a manner that in each case a thread engagement (76) can be brought into engagement with a thread turn segment (54a, b) of one of the thread regions (52a, b), and the thread turn segments (54a, b) which are at the same time in engagement with a thread engagement (76) contribute to fixing the riser pipe (44) relative to the riser pipe cover (42), in that in particular the thread turn segments (54a, b), which contribute at the same time to fixing the riser pipe (44) relative to the riser pipe cover (42), of the thread regions (52a, b) are located with the first ends (53) thereof and the second ends (55) thereof in the same plane (E1, E2) which extends perpendicularly to the centre axis (60) of the riser pipe (44).

11. Hydrant according to any one of the preceding claims, characterised in that the at least one thread engagement (76) is arranged on a retention flange (70) which is retained on the riser pipe cover (42), in that in particular the retention flange (70) is retained on a support flange (72) which is securely connected to the riser pipe cover (42), in that in particular the retention flange (70) is releasably retained on the support flange (72).

12. Hydrant according to claim 11, characterised in that< / b> the retention flange (70) comprises two flange halves (74a, b), of which in particular each one carries a thread engagement (76), wherein the support flange (72) with the flange halves (74a, b) can additionally be acted on with pressure ring segments (110a, b) which fix the riser pipe (44) on the outer circumferential face (64) in a non-positive-locking and in particular rotationally secure manner relative to the riser pipe cover (44), in that in particular each of the pressure ring segments (110a, 110b) can be acted on with force by the flange halves (74a, b) in the direction of the outer circumferential face (64) of the riser pipe, in that in particular the pressure ring segments (110a, b) are in the form of wedge members (114) which have wedge faces (112) and, when these wedge faces (112) are acted on by pressure faces (108) of the flange halves (74a, b), an application of force of the wedge members (114) radially relative to the outer circumferential face (64) and in particular in the direction of the support flange (70) occurs, in that in particular each flange half (74a, b) has a clamping shell member (82a, b) which carries the thread engagement (76), in that in particular each flange half (74a, b) has a clamping shell member (82a, b) which acts on at least one pressure ring segment (110a, b).

13. Hydrant according to claim 12, characterised in that each of the flange halves (74a, b) has a retention member (84a, b), in that in particular the respective retention member (86a, b) of the flange halves (74a, b) is constructed to engage around the support flange (72) of the riser pipe cover (42), in that in particular the respective retention member (82, 84) is constructed to engage behind the support flange (72) at a side facing away from the respective clamping shell member (82a, b), in that in particular the respective retention member (84a, b) can be connected to the support flange (72) in a rotationally secure manner by positive-locking connection, in that in particular the respective retention member (84a, b) by means of cooperation of the flange halves (74a, b) with the pressure ring segments (110a, b) engages behind the support flange (72) in a play-free manner.

14. Hydrant according to either claim 12 or 13, characterised in that the flange halves can be acted on by means of tensioning units (126) and can thereby be moved towards each other in the direction of the riser pipe (44) in such a manner that in particular the tensioning units (126) permit only such a release of the flange halves (74a, b) that they remain non-releasably and in particular rotationally securely connected to the support flange (72).

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