FI60267B - LAGER FOER BYGGNADS- ELLER BROKONSTRUKTIONER - Google Patents

Description

EBr *] Γβ] (11i NOTICE OF PUBLICATION ^ Π9Α7 lBJ (11) UTLÄGGNINGSSKRIFT OU ZD / • c (45) ·: ': j 1-': il patent -ne.Nelts ^ (51) Kv.lk.3 / lnt.CI .3 E 01 D 19/04 ENGLISH —EN N LAND (21) P »t * nttlh» k * mu «- Pu« ntanseknlng 750 ^ 90 (22) HakemlspUvi - Anteknlnpdag 21.02.75 ^ '(23) Alkupllvt— Glltlghetsdag 21.02.75 (41) Tullut JulklMkal - Bllvlt offentlig 23 · 08.75

Patent and Registration Office .... , . . ,,,, _. . , (44) NlhtivUulpanon ja kuul.Julk »l» un pvm.— nQ o.

Patent- och registerstyrelsen Ansökan utlagd oeh utl.tkriftan publicerad 31.0ö. oi (32) (33) (31) Privilege requested— Baglrd priority 22.02.7 ^

Sweden-Sweden (SE) 7 ^ 02 ^ 08- ^ (71) AB Strängbetong, Lindfcagensgatan 13an, Box 30036, S-10l + 25 Stockholm,

Sweden-Sweden (SE) (72) Lennart Pettersson, Ekerö, Tore Bergkvist, Bandhagen, Sweden-Sweden (SE) (7 * 0 Oy Kolster Ab (5M Bearing for building or bridge construction - Lager för byggnads- eller brokonstruktioner

The purpose of the pressure pad is to allow a certain movement between the structural parts connected to the bearing, both axially and radially with respect to the bearing, and the steel ring fitted in the guide groove serves to limit the lateral displacement of the parts under large radial forces.

In a bearing such as that described in Swiss Patent Publication No. 537,495, a pressure pad is enclosed between two equally large cup-shaped support elements and guide grooves of a steel ring are formed on the end faces of the cups, i.e. the bearing shells, facing each other. An intermediate space formed between these end faces, which allows the pressure pad to receive the load, is kept closed by a sealing ring resting on the inside of the shells.

The pressure pad enclosed in both bearing housings is relatively thick, which makes the bearing slightly unstable or easily laterally movable. When the bearing is subjected to such large lateral forces that the top bearing shell moves radially or tilts at a small angle to the bottom bearing shell, despite the inner sealing ring, there is a risk of the pad material leaking from the relatively wide gap between the end faces of the shells facing each other.

The invention is characterized in that the clearances between the inner side of the steel ring and the side walls of the guide grooves opposite it are each sealed by means of their own sealing ring resting on the steel ring. Thanks to the large support elements, it is possible to use a thin pressure pad, the thickness of which is determined exclusively by the desired mutual movement of the components connected to the bearing by means of a bearing. Both sealing rings receive a stable support from the smooth inner side of the steel ring, which is not subject to any deformation, and the sealing of both axial annular clearances therefore becomes no problem. Moreover, effective sealing is facilitated by the fact that the friction between the pressure pad and the adhering surfaces of the steel plates reduces the flow of pressure material in a certain amount of radially surface layers inside the sealing ring.

The accompanying drawing shows an axial section of a bearing formed in accordance with the invention, generally designated 1, mounted on a concrete base 2 to support only a partially shown support pillar 3, which is thought to be part of a building or bridge structure.

The bearing comprises a lower, square steel plate 11, which is fastened to the base 2 by means of four screws 5 with an interposed plate 4. The plate 11 is shown in diagonal section and the screws are thus placed inside the corners of the plate. Each screw is guided by a washer 6 placed on the mutually facing surfaces of the plates 11.4, in recesses formed around the holes of the screws and the threaded end of the screws is screwed into the base-cast steel body 7.

The upper steel plate 12 of the bearing, which together with the interposed pressure pad 13 is on the lower plate 11, is screwed to the lower end of the column 3. The plate 12 is similar in size and shape to the plate 11, but is rotated 90 ° with respect to the latter, so that its fixing screws are not visible. The pressure pad 13, which in the form shown is round and only slightly thicker than the plates 11,12, is of a soft rubber or plastic material, for example neoprene, which in strong compression, i. under the effect of downward compression of the pillar 3, transitions to a more or less fluid state.

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The pressure pad 13 is closely surrounded along its circumference by an approximately rectangular steel ring 14, which is guided by both axial and radial clearances in annular grooves 15,16 on the mutually facing sides 18 and 17 of both support plates 12 and 11. The steel ring 14 is supported by a pressure pad 13 so that the center sphere 21 formed around the circumference of the pad engages a corresponding circumferential groove on the inside of the steel ring. In the initial position or in the normal position, the steel ring is supported mainly so that it is separated from the side surfaces and bottoms of both grooves.

The grooves arranged on both sides of the pressure pad flange 21, inside the steel ring, are smooth and are intended to support two sealing rings 19,20, one of which 19 also contacts the upper side 17 of the lower plate 11 and seals the groove 16, while the other sealing ring 20 further contacts the upper plate bottom side 18 and seals the groove 15. In this way, the cushion material is prevented from penetrating out of the groove when the material becomes fluid under strong compression. The sealing rings 19-20 have a substantially rectangular cross-section and may well be a softer metal or alloy, such as copper or brass, compared to steel.

The blade ring 14 thus holds the pressure pad 13 in place between the two steel plates 11,12 and its function is to limit the mutual lateral projection of the two plates by gripping the side surfaces of the guide grooves 15-16. In such a protrusion, the steel ring may be subjected to an elastic deformation, whereby it may take on a slightly oval shape. However, this has no effect on the internal tightness because the sealing rings 19,20 have a permanently good contact with the inner side of the steel ring and the inner sides of the slabs 17,18.

It may be worth mentioning that the clearance between the side surfaces and the bottoms of the steel ring 14 and the grooves 15,16 is usually relatively small and generally does not increase by 2-3 mm. In any case, the clearance must be arranged so that as the plates 11,12 move or tilt relative to each other, the steel ring 14 receives support from the groove walls before it is exposed to the risk of permanent deformation, i. before the steel starts to run.