US3864977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diving time measuring device
Assignee: Individual
•
Filing: 1973-05-14
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Granted: 1975-02-11
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Expires: 1993-05-14
Abstract
Abstract A diving time measuring device indicates the remaining diving time available to a diver with a specified initial volume VA of breathable gas. The device includes a first pressure responsive means sensitive to the pressure difference PG between the gas supply pressure and the surrounding water pressure. This is rigidly connected to a second pressure responsive means that is responsive only to the water pressure PW. The two means are arranged so that an arm, attached to the second pressure responsive means, moves in orthogonal directions in response respectively to the pressure difference and to the water pressure. The relative orthogonal displacements of the arm designate the remaining available diving time t in accordance with the formula
Inventors
- 👤 Karl Leemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:56
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/02; G; G01; G01L; G01L13/00; G01L13/02; G01L13/021; G01L13/025; G01L7/00; G01L7/02; G01L7/04; G01L7/041; G01L7/043; G04; G04B; G04B47/00; G04B47/06; G04B47/066
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
259 words
Diving time measuring device for indicating the still available diving time for a diver, with a specific initial gas supply at a specific water diving depth, characterized by a first pressure responsive means responsive to the difference in pressure between the gas supply and the water pressure, which first means converts the change in said pressure difference into a movement of a part of said first means, and that the said part is rigidly connected to a second pressure responsive means that is exposed to the water pressure only, which second means converts the pressure change in the water at different diving depths into a movement of a part of said second means, which part of the second means, due to the rigid connection, in response to a simultaneous change of said pressure difference and water pressure, executes a movement combined of both individual movements, the means being so arranged and connected with each other, that the directions of the individual movements caused by a change in the pressure difference and water pressure are orthogonal to each other, whereby the position of the said part of said second means indicates the diving time t in accordance with the formula t VG/VA . PG/(PW + 1), wherein is PG the pressure difference between gas pressure and water pressure as sensed by said first means, PW the water pressure as sensed by said second means, and VG/VA is a constant established by the initial gas supply volume VC and the amount of gas VA used by the diver per time unit.
Claim 2
Dependent Claim
259 words
Diving time measuring device for indicating the still available diving time for a diver, with a specific initial gas supply at a specific water diving depth, characterized by a first pressure responsive means responsive to the difference in pressure between the gas supply and the water pressure, which first means converts the change in said pressure difference into a movement of a part of said first means, and that the said part is rigidly connected to a second pressure responsive means that is exposed to the water pressure only, which second means converts the pressure change in the water at different diving depths into a movement of a part of said second means, which part of the second means, due to the rigid connection, in response to a simultaneous change of said pressure difference and water pressure, executes a movement combined of both individual movements, the means being so arranged and connected with each other, that the directions of the individual movements caused by a change in the pressure difference and water pressure are orthogonal to each other, whereby the position of the said part of said second means indicates the diving time t in accordance with the formula t VG/VA . PG/(PW + 1), wherein is PG the pressure difference between gas pressure and water pressure as sensed by said first means, PW the water pressure as sensed by said second means, and VG/VA is a constant established by the initial gas supply volume VC and the amount of gas VA used by the diver per time unit.
Claim 3
Dependent Claim
242 words
Diving time measuring device according to claim 1 characterized in that the first means is a Bourdon tube arranged in a housing, whose one end is connected with a supply pipe in a part of the housing destined to be connected with a gas supply bottle, and whose other end, which forms the part moved by a change in the pressure difference, can move back and forth in one direction through extension and contraction of a tube which is affected at the inside by said gas supply pressure and exposed on the outside to the water pressure, and that the second means is a second Bourdon tube which is evacuated, and whose one end is rigidly connected with the said other end of the first tube, and whose free end, which forms the part moved by the change in the water pressure, can move back and forth in the other direction which is orthogonal to the first direction, through extension and contraction of the tube which is exposed at the outside to the water pressure, whereby the free end of the second tube, which serves as an indicator, can execute a movement composed of the two said individual movements due to the rigid connection of the Bourdon tubes, and that, furthermore, the housing has an opening closed by a diaphragm and is filled with a corrosion preventing medium, through which the water pressure which presses upon the diaphragm affects the Bourdon tubes.
Claim 4
Dependent Claim
60 words
Diving time measuring device according to the claim 1 characterized in that the moved part of the second means, is in connection with a level that can swing around an axis, and that a pointer, moved by the lever, and a dial are provided in the housing, which dial has a scale for direct reading of the diving time t.
Claim 5
Dependent Claim
157 words
Diving time measuring device according to claim 3 characterized in that the end of the evacuated Bourdon tube serving as the indicator is rigidly connected with a transfer arm, whose angular end presses laterally against a surface of a grooved upper leg of the lever, which can be swung around the axis, and can slide along this groove surface, and that the lever is U-shaped and its lower leg forms a tooth segment through which the swing axis extends parallel to the angular end of the transfer arm, and that the distance between the center axes of the angular arm end in its zero pOsition, corresponding to 0 atmosphere water pressure PW, and the parallel swinging axis is equal to the distance passed by the end of the transfer arm at a water pressure difference of 1 atmosphere, which causes the swinging axis to be located at the zero point for the absolute water pressure PW 1.
Claim 6
Dependent Claim
79 words
Diving time measuring device according to claim 4 characterized in that the tooth segment interlocks with a cog wheel, which is fastened to a pointer shaft mounted in the housing, upon which pointer shaft the pointer is fixed, and that a spring, mounted in the housing, presses against the pointer shaft, which keeps the connected parts, consisting of cog wheel, tooth segment with groove and transfer arm, free of play and pressed in the direction of the zero position.
Claim 7
Dependent Claim
40 words
Diving time measuring device according to claim 3, characterized in that the dial in the housing is exchangeably arranged, in order to exchange dials with different scales in accordance with different initial gas volumes VG, and different gas use VA.
Claim 8
Independent Claim
176 words
A device for indicating the diving time still available to an underwater diver with a specified initial volume of breathable gas, comprising; a housing, a first pressure responsive means within said housing and responsive to the difference in pressure between the gas supply pressure and the environmental water pressure, a second pressure responsive means within said housing and responsive only to the environmental water pressure, a moveable arm interconnected to said first and second pressure responsive means so as to move in a first direction only upon changes in pressure difference sensed by said first means and to move in a second direction orthogonal to said first direction only upon changes in environmental water pressure sensed by said second means, and lever means for converting said orthogonal motions of said arm to movement of an indicator that signifies the angular direction of a vector having first and second orthogonal components determined by the displacements of said arm along the corresponding first and second orthogonal directions, said angular direction being proportional to the remaining available diving time.
Claim 9
Independent Claim
176 words
A device for indicating the diving time still available to an underwater diver with a specified initial volume of breathable gas, comprising; a housing, a first pressure responsive means within said housing and responsive to the difference in pressure between the gas supply pressure and the environmental water pressure, a second pressure responsive means within said housing and responsive only to the environmental water pressure, a moveable arm interconnected to said first and second pressure responsive means so as to move in a first direction only upon changes in pressure difference sensed by said first means and to move in a second direction orthogonal to said first direction only upon changes in environmental water pressure sensed by said second means, and lever means for converting said orthogonal motions of said arm to movement of an indicator that signifies the angular direction of a vector having first and second orthogonal components determined by the displacements of said arm along the corresponding first and second orthogonal directions, said angular direction being proportional to the remaining available diving time.
References Cited (Backward Citations)
US3528290A
Cited
US3715927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |