Patent EP0066871A1 successfully refreshed from Google Patents.
EP0066871A1
Expired / Lapsed
EP
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A supply and control apparatus and method for a joint-forming machine and a joint-forming machine embodying same
Assignee: Haskel International LLC
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Filing: 1982-06-07
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Granted: —
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Expires: 2002-06-07
Abstract
Abstract A supply and control apparatus and method for a joint-forming machine, a joint-forming machine embodying same and jointed material made by use of same. In a machine for forming leak-proof joints between tubes and a tube sheet by the internal application of hydraulic swaging pressure, the flow of pressurized fluid from an adjustable pressure reduction valve 14 is permitted or interrupted by a control valve 40. An actuator 64 moves the control valve 40 between its flow-permitting and flow-interrupting positions (Figure 1 and Figure 2 respectively) in response to a control signal. In a pressure sensor 66, which is connected to the input and output sides of the control valve 40, a piston 70 is movable in response to the difference in the input and output pressures to produce, by switch 88, the control signal when a predetermined comparative pressure relationship exists. An intensifier 42 multiplies the pressure of the fluid supplied to the mandrel 59 for a period determined by an adjustable delay relay 90.
Inventors
- 👤 John W. Kelly
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 09:42
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/06; B21D39/08; B21D39/20; B21D39/203; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53113; Y10T29/53122
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
155 words
An apparatus for supplying and controlling the swaging pressure for a machine for forming leak-proof joints between tubes and a tube sheet by the internal application of hydraulic swaging pressure within the said tubes, the apparatus comprising: a pressure source; an adjustable pressure-reduction valve means arranged to receive pressurized fluid from the said source for reducing the pressure of the fluid to a selected level; a control valve means connected to the reduction valve means for selectively permitting or interrupting the flow of the fluid from the reduction valve means; a pressurization sensor means connected to the input and output sides of the control valve means and responsive to the pressures of the said input and output sides for generating a control signal when a predetermined comparative relationship exists between the said pressures; and an actuator means for causing the control valve means to interrupt the said flow in response to the said control signal.
Claim 2
Independent Claim
155 words
An apparatus for supplying and controlling the swaging pressure for a machine for forming leak-proof joints between tubes and a tube sheet by the internal application of hydraulic swaging pressure within the said tubes, the apparatus comprising: a pressure source; an adjustable pressure-reduction valve means arranged to receive pressurized fluid from the said source for reducing the pressure of the fluid to a selected level; a control valve means connected to the reduction valve means for selectively permitting or interrupting the flow of the fluid from the reduction valve means; a pressurization sensor means connected to the input and output sides of the control valve means and responsive to the pressures of the said input and output sides for generating a control signal when a predetermined comparative relationship exists between the said pressures; and an actuator means for causing the control valve means to interrupt the said flow in response to the said control signal.
Claim 3
Dependent Claim
23 words
An apparatus according to claim 1 further comprising a means for delaying the said control signal before the signal reaches the actuator means.
Claim 4
Dependent Claim
16 words
An apparatus according to claim 1 or 2 wherein the said actuator means is a solenoid.
Claim 5
Independent Claim
81 words
An apparatus according to any one of the preceding claims wherein the pressurization sensor means comprises: a cylinder; a piston movable within the cylinder to define first and second variable displacement pressure chambers on opposite sides of the piston, the said first chamber being connected to the said input side and the said second chamber being connected to the said output side; and a switch means responsive to the position of the said piston and adapted to activate the actuator means.
Claim 6
Dependent Claim
28 words
An apparatus according to claim 4 wherein the switch means is responsive to movement of the piston in a direction that reduces or eliminates the first pressure chamber.
Claim 7
Dependent Claim
55 words
6 An apparatus according to claim 4 or 5 wherein the said piston has first and second effective pressure surface areas respectively within the said first and second chambers on which areas the said pressurized fluid can act to cause movement of the said piston, the first area being smaller than the said second area.
Claim 8
Dependent Claim
31 words
An apparatus according to claim 4, 5 or 6 wherein the said piston is freely movable in the said cylinder in response to pressure in the said first and second chambers.
Claim 9
Independent Claim
91 words
An apparatus according to any one of claims 4 to 7 further comprising a slideway extending from the said first chamber and a rod slidable in the slideway and attached to the said piston, whereby the rod reduces that effective pressure surface area of the said piston which is responsive to the pressure in the said first chamber so that the effective pressure surface area of the said piston in the said first chamber is smaller than the effective pressure surface area of the said piston in the said second chamber.
Claim 10
Dependent Claim
15 words
An apparatus according to claim 8 wherein a seal surrounds the rod within the slideway.
Claim 11
Dependent Claim
28 words
An apparatus according to claim 8 or 9 wherein the said switch means is arranged to be operated by the said rod upon movement of the said piston.
Claim 12
Independent Claim
71 words
An apparatus according to any one of the preceding claims additionally comprising an intensifier means adapted to receive pressurized fluid from the pressure reduction valve means and to multiply the pressure of the fluid for supply to a swaging mandrel, the said control valve means being connected between the pressure reduction valve means and the intensifier means and being adapted to interrupt or permit flow as said to the intensifier means.
Claim 13
Dependent Claim
69 words
An apparatus according to claim 11 when dependent on claim 4, wherein the first pressure chamber of the pressurization sensor means is connected to the output side of the pressure reduction valve means and to the input side of the control valve means and the said second pressure chamber is connected to the output side of the control valve means and to the input side of the intensifier means.
Claim 14
Dependent Claim
38 words
A machine for forming leak-proof joints between tubes and a tube sheet by the internal application of hydraulic swaging pressure within the said tubes comprising a supply and control apparatus according to any one of the preceding claims.
Claim 15
Dependent Claim
24 words
A machine according to claim 13 when dependent on claim 11 additionally comprising a swaging mandrel adapted to receive fluid from the intensifier means.
Claim 16
Independent Claim
65 words
A method of supplying and controlling swaging pressure for a swaging mandrel comprising the steps of: adjusting the pressure of a pressurized fluid from a source to a selected level; supplying the fluid at the selected pressure to the swaging mandrel; automatically intensifying the pressure of the fluid supplied to the mandrel for a predetermined period; and automatically de-pressurizing the fluid supplied to the mandrel.
Claim 17
Independent Claim
65 words
A method of supplying and controlling swaging pressure for a swaging mandrel comprising the steps of: adjusting the pressure of a pressurized fluid from a source to a selected level; supplying the fluid at the selected pressure to the swaging mandrel; automatically intensifying the pressure of the fluid supplied to the mandrel for a predetermined period; and automatically de-pressurizing the fluid supplied to the mandrel.
Claim 18
Dependent Claim
84 words
A method according to claim 15 wherein the said period is determined by allowing the fluid at the said selected pressure, whilst fluid at the intensified pressure is being supplied to the swaging mandrel, to act on a cylinder and piston arrangement in order to activate automatically an adjustable time delay relay, which relay, after a pre-selected delay, causes a control valve to cut off the supply of fluid to the mandrel and to allow fluid to return from the mandrel to the source.
Claim 19
Dependent Claim
29 words
A tube and tube sheet assembly whenever made using an apparatus according to any one of claims 1 to 14 and/or a method according to claim 15 or 16.
References Cited (Backward Citations)
DE2616523B1
Cited
DE2622753B2
Cited
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