US3781520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric instantaneous water heater
Assignee: GARDOM AND LOCK Ltd
•
Filing: 1971-12-06
•
Granted: 1973-12-25
•
Expires: 1991-12-06
Abstract
Abstract An instaneous water heater includes a main electrically insulating body having an inlet and an outlet. A flow duct means extends between the inlet and outlet and includes an inlet bore, an outlet bore, a heater bore means, a first flexible, electrically insulating tube extending between the inlet bore and the heater bore means and a second flexible, electrically insulating tube extending between the heater bore means and the outlet bore. The inlet bore, outlet bore and the heater bore means are formed in the main body while the first and second tubes are formed separately and independently of the main body and each other. A clamping plate connects the ends of the tubes with respect to inlet bore, outlet bore and heater bore means. The tubes together with the inlet and outlet boers define a length sufficient to provide a resistance path which minimizes leakage current flow from an electric heater disposed within the heater bore means. A flow responsive switch means controls current flow the electric heater. A thermostat may be provided in series with the flow responsive switch.
Inventors
- 👤 G Gardom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:23
CPC Classifications
H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/52; H01H37/54; F; F24; F24H; F24H1/00; F24H1/10; F24H1/101; F24H1/102; F24H1/103; F24H9/00; F24H9/20; F24H9/2007; F24H9/2014; H01H35/00; H01H35/24; H01H35/34; H01H35/40
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
271 words
An instantaneous water heater comprising: a. a main rigid insulating body having an inlet and an outlet, b. a flow duct means extending between the inlet and outlet and including an inlet bore, an outlet bore, a heater bore means, first insulating flexible tube means extending between the inlet bore and the heater bore means and a second insulating flexible tube means extending between the heater bore means and the outlet bore, c. said inlet bore, said outlet bore, and heater bore means being disposed within said main insulating body, d. electrical heating means disposed in the heater bore means, e. said tube means together with the inlet bore and outlet bore defining a length sufficient to provide a resistance path which minimizes current flow from the electrical heating means to said inlet and said outlet, and f. a clamped on portion including a rigid insulating cross member secured to one end of said insulating body, g. said clamped on portion being removably attached to the insulating body with the ends of the tube means being secured to said clamped on portion, h. said clamped on portion including first registering port means connecting one end of said inlet bore with one end of said first flexible tube, a second registering port means connecting one end of said heater bore means with the other end of said first flexible tube, third registering port means connecting the other end of said heater bore means with one end of the second flexible tube and fourth registering port means connecting one end of said outlet bore with the other end of said second flexible tube.
Claim 2
Dependent Claim
271 words
An instantaneous water heater comprising: a. a main rigid insulating body having an inlet and an outlet, b. a flow duct means extending between the inlet and outlet and including an inlet bore, an outlet bore, a heater bore means, first insulating flexible tube means extending between the inlet bore and the heater bore means and a second insulating flexible tube means extending between the heater bore means and the outlet bore, c. said inlet bore, said outlet bore, and heater bore means being disposed within said main insulating body, d. electrical heating means disposed in the heater bore means, e. said tube means together with the inlet bore and outlet bore defining a length sufficient to provide a resistance path which minimizes current flow from the electrical heating means to said inlet and said outlet, and f. a clamped on portion including a rigid insulating cross member secured to one end of said insulating body, g. said clamped on portion being removably attached to the insulating body with the ends of the tube means being secured to said clamped on portion, h. said clamped on portion including first registering port means connecting one end of said inlet bore with one end of said first flexible tube, a second registering port means connecting one end of said heater bore means with the other end of said first flexible tube, third registering port means connecting the other end of said heater bore means with one end of the second flexible tube and fourth registering port means connecting one end of said outlet bore with the other end of said second flexible tube.
Claim 3
Dependent Claim
260 words
An instantaneous water heater comprising: a. a main rigid insulating body having an inlet and outlet, b. a flow duct means extending between the inlet and outlet and including an inlet bore, an outlet bore, a heater bore means, first insulating tube means extending between the inlet bore and the heater bore means and second insulating tube means extending between the heater bore means and the outlet bore, c. said inlet bore, outlet bore, and heater bore means being disposed within said main insulating body, d. said first and second tube means being formed separately and independently with respect to the main body and with respect to each other, e. electrical heating means disposed in the heater bore means, f. said tube means together with the inlet bore and outlet bore defining a length sufficient to provide a resistance path which minimizes current flow from the electrical heating means to said inlet and said outlet, and g. means for connecting said first and second tube means externally with respect to the main insulating body, h. said connecting means including a rigid insulating cross member secured to one end of the insulating body and a clamping plate mounted for sealing engagement with respect to the cross member, i. said cross member including port means registered with the inlet and outlet bores to allow fluid flow through said flow duct means, j. said clamping plate including openings to receive the ends of the tube means and register said ends with openings located in the cross member and communicating with the port means.
Claim 4
Dependent Claim
260 words
An instantaneous water heater comprising: a. a main rigid insulating body having an inlet and outlet, b. a flow duct means extending between the inlet and outlet and including an inlet bore, an outlet bore, a heater bore means, first insulating tube means extending between the inlet bore and the heater bore means and second insulating tube means extending between the heater bore means and the outlet bore, c. said inlet bore, outlet bore, and heater bore means being disposed within said main insulating body, d. said first and second tube means being formed separately and independently with respect to the main body and with respect to each other, e. electrical heating means disposed in the heater bore means, f. said tube means together with the inlet bore and outlet bore defining a length sufficient to provide a resistance path which minimizes current flow from the electrical heating means to said inlet and said outlet, and g. means for connecting said first and second tube means externally with respect to the main insulating body, h. said connecting means including a rigid insulating cross member secured to one end of the insulating body and a clamping plate mounted for sealing engagement with respect to the cross member, i. said cross member including port means registered with the inlet and outlet bores to allow fluid flow through said flow duct means, j. said clamping plate including openings to receive the ends of the tube means and register said ends with openings located in the cross member and communicating with the port means.
Claim 5
Dependent Claim
23 words
A heater as defined in claim 2 wherein said connecting means includes a sealing strip Disposed between the cross member and clamping plate.
Claim 6
Dependent Claim
237 words
An instantaneous water heater comprising: a. a main rigid insulating body having an inlet bore, an outlet bore and a heater bore means, an b. a pipe inlet union rigidly secured in said inlet bore of said body, c. a pipe outlet union rigidly secured in said outlet bore, d. heater element means disposed in the heater bore means, e. a rigid insulating cross member secured to one end portion of said main body, f. a first insulating flexible tube external of the main body and connected by its ends into said cross member, and g. a second insulating flexible tube external of the main body and connected by its ends into said cross member, h. said main body and said cross member porviding first registering port means connecting one end of said inlet bore with one end of said first tube, second registering port means connecting one end of said heater bore means with the other end of said first tube, third registering port means connecting the other end of said heater bore means with one end of said second tube, and fourth registering connecting one end of said outlet bore with the other end of said second flexible tube, i. the length of the flexible tubes and said inlet and outlet bores being sufficient to provide a minimum resistance path which minimizes current flow from the heater element means to said inlet and outlet unions.
Claim 7
Dependent Claim
237 words
An instantaneous water heater comprising: a. a main rigid insulating body having an inlet bore, an outlet bore and a heater bore means, an b. a pipe inlet union rigidly secured in said inlet bore of said body, c. a pipe outlet union rigidly secured in said outlet bore, d. heater element means disposed in the heater bore means, e. a rigid insulating cross member secured to one end portion of said main body, f. a first insulating flexible tube external of the main body and connected by its ends into said cross member, and g. a second insulating flexible tube external of the main body and connected by its ends into said cross member, h. said main body and said cross member porviding first registering port means connecting one end of said inlet bore with one end of said first tube, second registering port means connecting one end of said heater bore means with the other end of said first tube, third registering port means connecting the other end of said heater bore means with one end of said second tube, and fourth registering connecting one end of said outlet bore with the other end of said second flexible tube, i. the length of the flexible tubes and said inlet and outlet bores being sufficient to provide a minimum resistance path which minimizes current flow from the heater element means to said inlet and outlet unions.
Claim 8
Dependent Claim
39 words
A heater as defined in claim 4 wherein said rigid inlet and outlet unions secure a metallic base plate against one end of the insulating body, and grounding means for said heater is electrically connected to the base plate.
Claim 9
Dependent Claim
41 words
A heater as defined in claim 4 wherein an automatic control means is attached to the insulating body and is responsive to a change in pressure within said bore means for controlling the electric heating current to said electrical heating means.
Claim 10
Dependent Claim
58 words
A heater as defined in claim 6 wherein said control means includes a diaphragm clamped to one side of said body, a duct extending through the wall of said body between said diaphragm and one of said inlet and outlet bores or heater bore means, and an electrical switch secured to said body and actuatable by said diaphragm.
Claim 11
Dependent Claim
27 words
A heater as defined in claim 6 wherein said automatic control means includes a non-return valve which controls the flow of water through said flow duct means.
Claim 12
Dependent Claim
29 words
A heater as defined in claim 6 wherein said automatic control means includes a pressure sensitive switch and a thermostat wired in series to control the electric heating means.
Claim 13
Dependent Claim
83 words
A heater as defined in claim 6 wherein said automatic control means includes a duct extending through the wall of said body, an electrical switch, a movably mounted, spring biased piston member which actuates said electrical switch, a sensitive resilient diaphragm exposed on one side to pressure within said heater bore means via said duct, said piston member being responsive to movement of said diaphragm, and the on and off positions of the electrical switch lie within the working stroke of the diaphragm.
Claim 14
Dependent Claim
26 words
A heater as defined in claim 6 wherein said automatic control means includes a single pressure sensitive switch responsive to pressure in said flow duct means.
Claim 15
Dependent Claim
103 words
A heater as defined in claim 11 wherein said pressure sensitive switch includes a resilient diaphragm, a piston means and an electrical switch member, said control means includes a duct extending through the body between said diaphragm and one of said inlet and outlet bores or said heater bore means, said diaphragm is exposed on one side to pressure by way of said duct and the piston means is located on the other side of the diaphragm, said piston means actuates the electrical switch member in response to movement of the resilient diaphragm, said piston means being spring biased toward said resilient diaphragm.
Claim 16
Dependent Claim
29 words
A heater as defined in claim 12 wherEin said resilient diaphragm includes an annular corregation and said piston member has a flanged head which nestles within said annular corrugation.
Claim 17
Dependent Claim
34 words
A heater as defined in claim 12 wherein said resilient diaphragm has a flanged rim and said control means includes a cap member which contacts said flanged rim and sealingly engages said insulating body.
Claim 18
Dependent Claim
201 words
An instantaneous water heater comprising: a. a main rigid insulating body having an inlet and an outlet, b. flow duct means extending between the inlet and the outlet and including an inlet bore, an outlet bore, a heater bore means, first insulating flexible tube means extending between the inlet bore and the heater bore means, and second insulating flexible tube means extending between the heater bore means and the outlet bore, c. said inlet bore, outlet bore and heater bore means being disposed within said main insulating body, d. said first and second tube means being formed separately and independently with respect to the main body and with respect to each other, e. electrical heating means disposed in the heater bore means, f. said tube means together with the inlet bore and outlet bore defining a length sufficient to provide a resistance path which minimizes current flow from the electrical heating means to said inlet and said outlet, g. a clamped on portion being removably secured to one end of said insulating body and forming port means therewith to allow fluid flow through said flow duct means, h. means for securing the ends of said tube means to said port means.
Claim 19
Dependent Claim
201 words
An instantaneous water heater comprising: a. a main rigid insulating body having an inlet and an outlet, b. flow duct means extending between the inlet and the outlet and including an inlet bore, an outlet bore, a heater bore means, first insulating flexible tube means extending between the inlet bore and the heater bore means, and second insulating flexible tube means extending between the heater bore means and the outlet bore, c. said inlet bore, outlet bore and heater bore means being disposed within said main insulating body, d. said first and second tube means being formed separately and independently with respect to the main body and with respect to each other, e. electrical heating means disposed in the heater bore means, f. said tube means together with the inlet bore and outlet bore defining a length sufficient to provide a resistance path which minimizes current flow from the electrical heating means to said inlet and said outlet, g. a clamped on portion being removably secured to one end of said insulating body and forming port means therewith to allow fluid flow through said flow duct means, h. means for securing the ends of said tube means to said port means.
Claim 20
Dependent Claim
233 words
An instantaneous water heater comprising: a. a main rigid insulating body having an inlet and an outlet, b. flow duct means extending between the inlet and the outlet and including an inlet bore, an outlet bore, a heater bore means, first insulating flexible tube means extending between the inlet bore and heater bore means, and second insulating flexible tube means extending between the heater bore means and the outlet bore, c. said inlet bore, outlet bore and heater bore means being disposed within said main insulating body, d. said first and second tube means being formed separately and independently with respect to the main body and with respect to each other, e. electrical heating means disposed in the heater bore means, f. said tube means together with the inlet bore and outlet bore defining a length sufficient to provide a resistance path which minimizes current flow from the electrical heating means to said inlet and said outlet, g. a clamped on portion being removably secured to one end of said insulating body and forming port means therewith to allow fluid flow through said flow duct means, h. means for securing the ends of said tube means to the clamped on portion, and i. automatic control means attached to the insulating body for controlling the electrical heating current to said electrical heating means in response to the fluid flow through said flow duct means.
Claim 21
Dependent Claim
233 words
An instantaneous water heater comprising: a. a main rigid insulating body having an inlet and an outlet, b. flow duct means extending between the inlet and the outlet and including an inlet bore, an outlet bore, a heater bore means, first insulating flexible tube means extending between the inlet bore and heater bore means, and second insulating flexible tube means extending between the heater bore means and the outlet bore, c. said inlet bore, outlet bore and heater bore means being disposed within said main insulating body, d. said first and second tube means being formed separately and independently with respect to the main body and with respect to each other, e. electrical heating means disposed in the heater bore means, f. said tube means together with the inlet bore and outlet bore defining a length sufficient to provide a resistance path which minimizes current flow from the electrical heating means to said inlet and said outlet, g. a clamped on portion being removably secured to one end of said insulating body and forming port means therewith to allow fluid flow through said flow duct means, h. means for securing the ends of said tube means to the clamped on portion, and i. automatic control means attached to the insulating body for controlling the electrical heating current to said electrical heating means in response to the fluid flow through said flow duct means.
Claim 22
Dependent Claim
62 words
An instantaneous water heater as defined in claim 16 wherein said automatic control means includes a diaphragm disposed on one side of said body, a duct extending through the wall of said body between said diaphragm and one of the inlet and outlet bores or heater bore means and an electrical switch secured to said main body and actuatable by said diaphragm.
Claim 23
Dependent Claim
113 words
A heater as defined in claim 16 wherein said control means includes first and second resilient diaphragm members, first and second ducts extending through the wall of said body, and an electrical switch secured to said body, said first duct extending between the inlet bore and the first diaphragm member which is thereby exposed on one side to pressure within the inlet bore, said second duct extending between the outlet bore and the second diaphragm member which is thereby exposed to pressure with the outlet bore, and said first and second diaphragm members being mechanically Tied together, whereby the control means is responsive to the pressure differential between the inlet and outlet bores.
Claim 24
Dependent Claim
29 words
A heater as defined in claim 18 wherein said electrical switch has an off and on position which lies within the working stroke of said first and second diaphragms.
Claim 25
Dependent Claim
61 words
A heater member as defined in claim 18 wherein each diaphragm has a flanged rim and a first cap member contacts the flanged rim of said first diaphragm and sealingly engages a first side of the insulating body and a second cap member contacts the flanged rim of said second diaphragm and sealingly engages the other side of the insulating body.
Claim 26
Dependent Claim
25 words
A heater member as defined in claim 18 wherein the first and second diaphragm members are located on the same side of the insulating body.
Claim 27
Dependent Claim
179 words
An instantaneous water heater having an inlet and an outlet and comprising: a. an insulating body having a clamped on portion and a main portion, said main portion defining an inlet bore connected to said inlet, an outlet bore connected to said outlet and a heater bore means, b. an electrical heating means disposed in said heater bore means, c. said inlet bore, outlet and heater bore means being connected to ports in said clamped on portion to which external tube means are secured whereby to connect said heater bore means to said inlet and outlet bores to form a flow duct means running from said inlet to said outlet, d. said tube means being composed of flexible, electrical insulating material, and e. housing means defining a confined space around the insulating body, f. said external tubes being looped into the confined space to provide a length of flexible tube means together with the inlet bore or the outlet bore sufficient to form the required long electrical resistance paths between the heating element means and the inlet and outlet.
Claim 28
Dependent Claim
179 words
An instantaneous water heater having an inlet and an outlet and comprising: a. an insulating body having a clamped on portion and a main portion, said main portion defining an inlet bore connected to said inlet, an outlet bore connected to said outlet and a heater bore means, b. an electrical heating means disposed in said heater bore means, c. said inlet bore, outlet and heater bore means being connected to ports in said clamped on portion to which external tube means are secured whereby to connect said heater bore means to said inlet and outlet bores to form a flow duct means running from said inlet to said outlet, d. said tube means being composed of flexible, electrical insulating material, and e. housing means defining a confined space around the insulating body, f. said external tubes being looped into the confined space to provide a length of flexible tube means together with the inlet bore or the outlet bore sufficient to form the required long electrical resistance paths between the heating element means and the inlet and outlet.
Claim 29
Dependent Claim
243 words
An instantaneous water heater having an inlet and an outlet and comprising: a. a back plate, b. a main insulating body secured to said back plate, c. a cover secured to said back plate to enclose said body, d. a flow duct means extending between the inlet and outlet and including an inlet bore, an outlet bore, a heater bore means, first insulating flexible tube means extending between the inlet bore and the heater bore means, and second insulating flexible tube means extending between the heater bore means and the outlet bore, e. said inlet bore, outlet bore, and heater bore means being disposed within said main insulating body, f. said first and second tube means being formed separately and independently with respect to the main body and with respect to each other, g. electrical heating means disposed in the heater bore means, h. said tube means together with the inlet bore and the outlet bore defining a length sufficient to provide a resistance path which minimizes current flow from the electrical heating means to said inlet and said outlet, i. a clamped on portion being removably secured to one end of said insulating body annd forming port means therewith to allow fluid flow through said flow duct means, j. means for securing the ends of said tube means to said port means, and k. switch means mounted on said body to control the flow of electric current to said electrical heating means.
Claim 30
Dependent Claim
243 words
An instantaneous water heater having an inlet and an outlet and comprising: a. a back plate, b. a main insulating body secured to said back plate, c. a cover secured to said back plate to enclose said body, d. a flow duct means extending between the inlet and outlet and including an inlet bore, an outlet bore, a heater bore means, first insulating flexible tube means extending between the inlet bore and the heater bore means, and second insulating flexible tube means extending between the heater bore means and the outlet bore, e. said inlet bore, outlet bore, and heater bore means being disposed within said main insulating body, f. said first and second tube means being formed separately and independently with respect to the main body and with respect to each other, g. electrical heating means disposed in the heater bore means, h. said tube means together with the inlet bore and the outlet bore defining a length sufficient to provide a resistance path which minimizes current flow from the electrical heating means to said inlet and said outlet, i. a clamped on portion being removably secured to one end of said insulating body annd forming port means therewith to allow fluid flow through said flow duct means, j. means for securing the ends of said tube means to said port means, and k. switch means mounted on said body to control the flow of electric current to said electrical heating means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |