Patent EP0343395B1 successfully refreshed from Google Patents.
EP0343395B1
Expired / Lapsed
EP
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Pressfitting, tap and method of manufacture
Assignee: R Nussbaum AG
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Filing: 1989-04-27
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Granted: 1996-06-05
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Expires: 2009-04-27
Abstract
Abstract Press connection of a connection piece of a tap (1) or of a fitting of cast metal to a conduit (5) whose crushing yield point and modulus of elasticity are greater than those of the connection piece (2). The wall thickness of the piece (2) is so dimensioned that it can be pressed onto an elastic conduit (5) adapted to its internal diameter. Since, for example, in the case of a plastic or copper conduit the crushing yield point and the modulus of elasticity of the conduit are smaller than those of the piece (2), an elastic support sleeve is pushed into the pipe, its crushing yield point and modulus of elasticity being greater than those of the piece (2), pressing the plastic conduit sealingly against the piece (2). <IMAGE>
Inventors
- 👤 Kurt Martin
- 👤 Walter Viegener
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:49
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/14; F16L13/16; F16L13/161; F16L13/141; F16L13/142
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
202 words
Press connection arrangement, wherein a connection piece (2) of a fitting (1) of cast metal is pressed onto a tube (5, 21) which has no substantial worked-out changes of the wall thickness thereof in the area of the press connection and which is not reinforced or is provided with a support sleeve, the yield point under pressure of the connection piece (2) is at most equal to that of the tube (5) or of the support sleeve (23, 31), as the case may be, and the modulus of elasticity of the support sleeve is greater than that of the tube (21) accommodating the support sleeve, so that the tube (5) or the support sleeve (23, 31), as the case may be, attempts to a greater extent than does the connection piece (2) to recover its shape after the pressing pressure active during the pressing-on operation is removed, in order to press the tube onto the plastically deformed connection piece, the wall thickness of the connection piece (2) being such that this piece resists the recovery of the tube (5) or of the support sleeve (23), as the case may be, which is attributable to their resilience after the pressure has been removed.
Claim 2
Dependent Claim
67 words
Arrangement according to claim 1, characterised in that the connection piece (2) and the tube (5) or the support sleeve (21, 31), as the case may be, comprise different metal materials and the yield point under pressure and the modulus of elasticity of the connection piece (2) are smaller than those of the tube (5) or of the support sleeve (23, 31), as the case may be.
Claim 3
Dependent Claim
30 words
Arrangement according to claim 1 or 2, characterised by sealing means (8) between the inner wall of the connection piece (2) and the outer wall of the tube (5, 21).
Claim 4
Dependent Claim
80 words
Arrangement according to any one of claims 1 to 3, characterised in that the support sleeve (31) has an inner sleeve portion (33) arranged in the tube (21) and an outer sleeve portion (35) abutting the outer surface of the tube (21), both of which are compressed in a positively locking manner with the tube (21), the inner sleeve portion (33) being connected to the outer sleeve portion (35) by a web (37) around the front of the tube end.
Claim 5
Dependent Claim
33 words
Arrangement according to claim 4, characterised by sealing means (45, 8) between the inner sleeve portion (33) and the tube (21) and/or between the outer sleeve portion (35) and the connection piece (2).
Claim 6
Dependent Claim
41 words
Arrangement according to any one of claims 1 to 5, characterised in that the wall of the connection piece (2) and of the tube (5, 21) are deformed plastically in such a manner that a positive lock is present between them.
Claim 7
Dependent Claim
55 words
Arrangement according to any one of claims 1 to 6, characterised in that the connection piece (2) is, at several sites which are spaced apart from one another along the circumference, pressed onto the tube (5, 21), or the tube (5, 21) is compressed with the support sleeve (23, 31), as the case may be.
Claim 8
Dependent Claim
123 words
Arrangement according to any one of claims 1 to 7, characterised in that the connection piece (2) has, on the outside, an annular bead (7) and, on the inside, an annular groove (9) which projects into the bead and in which is inserted a sealing ring (8) which abuts the tube (5) in sealing manner, and in that the annular bead (7) is arranged at a distance from the free end of the connection piece (2) and the connection piece (2) is compressed in positivelocking manner with the tube (5) on both sides of the annular bead (7) so that the tube portion lying between the two compressed portions is secured against axial displacement and rotation with respect to the sealing ring (8).
Claim 9
Dependent Claim
41 words
Arrangement according to any one of claims 1 to 8, characterised in that the tube (5) is a connecting tube piece formed integrally on the fitting (1), so that it is possible to produce a direct connection to a second fitting.
Claim 10
Dependent Claim
194 words
Construction kit for manufacturing the connection arrangement according to any one of claims 1 to 9, which has a first fitting (1) of cast metal having at least one tubular, non-threaded connection piece (2) and a second fitting having at least one non-threaded tube end piece (5, 21) with (25, 31) or without a support sleeve reinforcement, wherein the inner surface of the connection piece (2) and the outer surface of the tube end piece (5) are constructed to be assembled with only the disadvantage of play, the yield point under pressure of the connection piece is at most equal to that of the tube end piece (5) or of the reinforced tube end piece (21), as the case may be, so that, when the tube end piece (5) is inserted or when the tube end piece (21) is reinforced, as the case may be, the connection piece (2) can be plastically deformed without cracking by means of pliers placed thereon and the connection piece cross-sectional contour obtained after deformation cannot be recovered by the resilient restoring force of the inserted tube end piece (5) or of the reinforced tube end piece (21), respectively.
Claim 11
Dependent Claim
127 words
Fitting (1) of the construction kit according to claim 10 for use in the construction kit according to claim 10 consisting substantially of a gunmetal alloy, preferably having at least approximately 2% Sn, 8% Zn, 5% Pb, from 2.2 to 3.0% Ni, the remainder being copper, having a tubular, non-threaded connection piece (2) which has a wall thickness of between 1 and 2 mm and no substantial worked-out changes of the wall thickness thereof, and which can be compressed plastically by means of pliers, without the formation of cracks and in fluid-tight manner, with a tube end piece (5, 21) of a second fitting of the construction kit according to claim 10, which tube end piece is adapted to the inside diameter of the connection piece (2).
Claim 12
Dependent Claim
47 words
Fitting (1) according to claim 11, characterised in that its connection piece (2) has, on the outside, at least one annular bead (7) and, on the inside, an annular groove (9) which projects into the annular bead and in which a sealing ring (8) can be arranged.
Claim 13
Dependent Claim
88 words
Fitting according to claim 12, characterised in that the annular bead (7) is arranged at a distance from the free end (12) of the connection piece (2) and the distance is such that both the end portion (12) projecting beyond the annular bead (7) and the portion of the connection piece (2) lying on the other side of the bead (7) can be compressed with the tube (5, 21) by means of the pliers, the bead (7) being constructed for positioning the jaws (15, 16) of the pliers.
Claim 14
Dependent Claim
70 words
Fitting according to claim 11, characterised in that the inner face of the connection piece (2) has, outside the pressing area, an annular step (13) as far as which the tube end piece (5, 21) can be inserted, and the step height preferably corresponds approximately to the tube wall thickness or to the outside diameter of a support sleeve (23, 31) which can be fitted to the tube end piece.
Claim 15
Dependent Claim
109 words
Method of manufacturing a fluid-tight press connection according to either claim 1 or claim 4, characterised in that the connection piece (2) is slipped onto the tube (5) or the support sleeve (31) is pressed into the tube end, or the inner and outer sleeve portions (33, 35) of the support sleeve are placed on the tube (21), and the connection piece (2) is slipped onto the tube (21) reinforced by the support sleeve, and then the connection piece (2) is pressed by means of pliers, with plastic deformation, against the tube (5) or the tube (21) reinforced by the support sleeve (25, 31), as the case may be.
Claim 16
Dependent Claim
70 words
Method according to claim 15, characterised in that, during the pressing operation, depressions are impressed in the connection piece (2) at various sites which are spaced apart from one another along its circumference, which depressions produce a positive lock between the connection piece (2) and the tube (5, 21) or between the connection piece (2) and the tube (21) with the support sleeve (23, 31), as the case may be.
Claim 17
Dependent Claim
118 words
Method of manufacturing the fitting (1) according to claim 11, characterised in that it (1) is cast from a gunmetal alloy, preferably having at least approximately 2% Sn, 8% Zn, 5% Pb, from 2.2 to 3.0% Ni, the remainder being copper, and is annealed at a temperature of from two hundred to five hundred degrees Celsius for at least one hour so that its cast connection piece can be pressed plastically by means of pliers, without the formation of cracks and in fluid-tight manner, onto a tube end piece (5, 21) of a second fitting of the construction kit according to claim 10, which tube end piece is adapted to the inside diameter of the connection piece (2).
References Cited (Backward Citations)
No citation records indexed.
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