DE20014257U1 - Ground consolidation roller - Google Patents

Description

Dipl.-lng. A. Wasmeier

Dipl.-lng. H. Graf

Authorized before the European Patent Office + Trade Mark Office · Professional Representatives before the European Patent Office + Trade Mark Office

Patent Attorneys PO Box 10 08 26 93008 Regensburg

German Patent
and Trademark Office
Zweibrückenstr. 12

80297 Munich

D-93008 REGENSBURG P.O. BOX 10 08 26

D-93055 REGENSBURG GREFLINGERSTRASSE 7

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(0941)79 20 85 (0941)79 20 86 (0941)79 51 06

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E-mail:
wasmeier-graf@t-online.de

Your Reference Your Ref.

Your Message Your Letter

Our Ref.

H/g 19,770

Date

16 August 2000 w-kar

Applicant:

Konrad Hendlmeier

Eh gone 1

93107 Untersanding

Title:

Soil consolidation roller

Accounts: HypoVereinsbank (bank code 750 200 73) 5 839

Postgiroamt München (bank code 700 100 80) 893 69-801 Place of jurisdiction Regensburg A19770.DOC
17.08.00 03:55

Soil consolidation roller

The innovation relates to soil stabilization rollers according to the preamble of claim 1.

Soil stabilization rollers are known which have individual, separate stamping tools which are attached parallel to one another and spaced apart from one another on the roller axis. These stamping tools consist of sickle-shaped elements or angled spring arms which are attached to the axis of the roller on one side, the inner section of which, which is attached to the axis, runs radially outwards and the outer section of which, which adjoins the inner section, is a partial circle adapted to the circumference, with the individual sickle-shaped spring elements being approximately uniformly spaced apart in the circumferential direction and lying in one plane.

Such soil stabilization rollers have the disadvantage that the spring elements, which are clamped on one side and designed as cantilevered supports, have to be very stable in order to avoid breakage due to the high forces that come into effect when deflecting, and are therefore relatively expensive. Furthermore, the so-called lock, i.e. the overlap of the rear end of a spring element with the front end of the following spring element, leads to undesirable stress and thus represents a risk of breakage for the spring when the free spring element hits the clamped part of the following spring element.

The aim of the innovation is to design a soil stabilization roller of this type with an essentially closed peripheral surface of the roller body and stamping spring elements interacting with it in such a way that, on the one hand, a higher stability of the peripheral surface of the roller and thus a lower risk of breakage is achieved, and on the other hand that the spring effort is reduced and the locking effect is avoided.

According to the innovation, this is achieved with the features of the characterizing part of claim 1 or claim 2. Further embodiments of the innovation are the subject of the subclaims.

One version of the innovation is characterized by the fact that the roller body is a spoked wheel with a closed circumference, the circumference of which preferably consists of a profile tube, and that the outer surface of the profile tube has spring arms arranged on one side and in the manner of a cantilever, which, when in contact with the ground while the roller is rolling, essentially adapt to the circular shape of the outer surface of the storage wheel circumference. In this variant, the roller body is made of spoked wheels with a closed ring-shaped circumference, on the outside of which the spring elements are firmly clamped or connected on one side, e.g. screwed, riveted or similar. In the second variant, the circumferential surface of the stamping tools is an interrupted ring, which consists of several cloverleaf-like, interconnected individual fields assigned to one another in the circumferential direction, e.g. three, four or five individual springs, which extend accordingly over a range of 120°, 90° or 72° and which each have a spoke-shaped radial formation on one side, which merges into a circumferential surface; the end of the circumferential surface is bent back in the radial direction into a radial flange running parallel to the next spoke, such that the spokes each consist of a radial bend of the circumferential part of one section and a radial section of the preceding section connected to the roller axis, and a radial flange of the spring element is attached between the two.

The spring elements are preferably designed as flat iron and are made of metal or plastic. They are shaped in such a way that, in the unloaded state, they are arranged approximately tangentially or slightly curved relative to the circumference of the peripheral surface, so that when in contact with the ground, the respective spring element is pressed against this peripheral surface until it comes into engagement with it over its entire extent.

In the new proposal, the spring travel of the spring element is limited in the event of a deflection due to contact with the ground; after a corresponding deflection, the spring element comes into contact with the section of the roller's circumference over essentially its entire extent. With this uniform contact, the stress on the spring element due to this surface contact is relatively low, so that a relatively weak spring can be used and the spring effort can be kept low.

The innovation is explained below in conjunction with the drawing using examples. It shows:

Fig. 1 shows a first embodiment of the innovation with a continuous outer ring, Fig. 2 shows a further embodiment of the innovation with an outer ring consisting of several sections.

In Fig. 1, a soil stabilization roller is shown schematically in a side view and shows one of the stamping tools arranged parallel to one another in the axial direction. Spokes 2, 3, 4 extend from a roller axis 1 and lead into a spoke ring 5, so that the shape of a spoked wheel is created. The outer surface 6 of the spoke ring 5, which can be designed, for example, as a profile tube with any cross-sectional shape, accommodates spring elements 7, 8, 9 ... which are fixed to the outer ring 5 at 10, 11, 12 ..., e.g. screwed or riveted, and which run approximately tangentially from the fastening point 10, 11, 12... against the direction of travel. When the roller engages the ground, the free end 13, 14 ... of the spring element 7, 8... either hits the beginning of the spring element arranged downstream in the circumferential direction, depending on the length of the spring element, whereby a significant part of the spring element comes into engagement with the associated outer surface 6 of the outer ring 5, or, if the spring element has a shorter length, comes into contact with the entire surface 13", 14" on the outer surface 6 of the ring 5. During operation of the soil consolidation roller, a corresponding

•♦ ·

Alternating application of the spring element to the outer surface of the storage ring and release of this spring element into the initial state.

The position of the engagement of the free spring end 13 with the outer surface 6, indicated by 13', indicates the so-called "lock", in which the free end 13' of the spring element 7 overlaps the beginning of the trailing spring element 8, which results in a correspondingly high stress on the spring element during operation. It is therefore more expedient to design the spring element 7 with such a length that when the spring element 7 rests on the outer surface 6 of the ring 5, the two adjacent spring elements 7, 8 do not overlap, but the inner surface 13" comes into contact with the outer ring surface 6 over its entire extent.

The embodiment according to Figure 2 corresponds to a spoked wheel, the circumference of which consists of several sections or fields A, A', A", A"' which are connected in the circumferential direction but are interrupted or separated from one another, namely four of them in the illustration according to Figure 2. A cross-shaped radial spoke arrangement 16, 16', 16" ... is attached to the roller axis 15; the spokes merge at the outer end at 17, 17'... into an outer ring surface 18, 18'... running in the circumferential direction and in the working direction, the free end of which is bent inwards at 19, 19 '... and ends in a radial flange 20, 20'... This radial flange 20 is fixed to the spoke 16 of the preceding section A by a screw or rivet connection 21 in such a way that the transition from the outer ring surface 18 to the outer ring surface 18' is as smooth or even as possible. Between the two elements of spoke 16 and flange 20 facing each other, a radial flange 22 of a spring element 23 of the preceding section A is inserted, which is fixed via the same connection point. The spring element 23 has a curvature at the outer end of the flange 22 which transitions into a radial projection and continues in the circumferential direction into the actual spring element 23. The spring element 23 is designed in such a way that the free end 24, when the roller engages the ground, rests with its underside 25 against the outer ring surface 18 and the end 24 in the fully deflected state results in a smooth, flat transition to the trailing spring element 25'.

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The outer ring according to the embodiment of Figure 2 is not rigid in itself, but is designed to be flexible to a limited extent, so that a flexible outer ring is created.

Claims (6)

1. Soil consolidation roller with individual stamping tools which are fastened parallel to one another and from one another in the axial direction on the roller axis and which have spring elements which are fastened on one side to the roller axis and can be deflected in the radial direction, characterized in that each stamping tool ( 1-9 ) has a plurality of spring elements ( 7 , 8 , 9 ) which are hinged or fastened on one side to the outer circumference of a storage wheel-shaped roller body ( 1-5 ), which are arranged one behind the other and tangentially in the circumferential direction and, in the deflected state, essentially rest against the outer surface ( 6 ) of the storage wheel when in contact with the ground. 2. Soil consolidation roller according to claim 1, characterized in that the roller body ( 15-8 ) is a spoked wheel with a closed circumference ( 5 ) which consists of a profile tube, and that the outer surface ( 6 ) of the profile tube has spring arms ( 7 , 8 , 9 ) arranged on one side and in the manner of a cantilever, which, when in contact with the ground during the rolling of the roller, adapt essentially to the circular shape of the outer surface ( 6 ) of the storage wheel circumference. 3. Soil stabilization roller according to claim 1, characterized in that each spoke ( 16 , 16 ' . . .) of a storage wheel is attached at one end to the roller axis ( 15 ) and at the other end is bent by approximately 90° in the direction of travel and forms part of the circumferential circle and at the free end of the partial circle ( 18 ) is bent inwards in the radial direction to a radial flange ( 20 ) which represents a fastening point ( 21 ) with the radially extending spokes ( 16 ') of the leading section (A'). 4. Soil consolidation roller according to claim 3, characterized in that the fastening of the radially extending flange ( 20 ) to the spoke ( 16 ') of the leading section (A') is a screw or rivet connection ( 21 ). 5. Soil consolidation roller according to one of claims 1-4, characterized in that the leading spring element ( 7 ; 23 ) overlaps with its rear end ( 13 ; 24 ) the front fastening end ( 10 ) of the following spring element ( 8 ; 23 ) in the event of a deflection, e.g. due to contact with the ground. 6. Soil consolidation roller according to one of claims 1-4, characterized in that the length of the preceding spring element in the circumferential direction is slightly smaller than the circumferential distance to the beginning of the following spring element, so that in the event of a deflection, e.g. due to contact with the ground, the deflectable part of the preceding spring element rests against the circumferential surface of the storage wheel over essentially its entire longitudinal extent.