US2371909A - Fluid operated switch - Google Patents

Fluid operated switch Download PDF

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Publication number
US2371909A
US2371909A US419794A US41979441A US2371909A US 2371909 A US2371909 A US 2371909A US 419794 A US419794 A US 419794A US 41979441 A US41979441 A US 41979441A US 2371909 A US2371909 A US 2371909A
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US
United States
Prior art keywords
signal
cylinder
contact
piston
stop
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US419794A
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English (en)
Inventor
Naerbo Daniel
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Individual
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Individual
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Publication date
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Application granted granted Critical
Publication of US2371909A publication Critical patent/US2371909A/en
Priority claimed from GB2961945A external-priority patent/GB600435A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/02—Detecting movement of traffic to be counted or controlled using treadles built into the road
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F11/00—Road engineering aspects of Embedding pads or other sensitive devices in paving or other road surfaces, e.g. traffic detectors, vehicle-operated pressure-sensitive actuators, devices for monitoring atmospheric or road conditions

Definitions

  • the present invention involves an apparatus of the last-mentioned kind, in which the signalling apparatus comprises one circuit for a clear"-signal and one circuit for a "stop"-signal, and its purpose is first of all to provide for such an apparatus an electric switch which will be more reliable in its iunctioning than those employed in the hitherto known apparatuses of this kind. 4
  • the characteristic feature of the apparatus according to the invention consists mainly in the fact that the making and breaking of the circuits for "clear, and "stop-signals are effected by means of a contact-member, mechanically connected with the piston moved by the pressure of the liquid, which member during the movement of the said pisten from its 'lowest to its highest position brings about an electric connection firstly between two stationary switchelements in the cle'ar'-signa1 circuit and afterwards between two such elements in the stop"- signal circuit.
  • FIG. 1 diagrammatically shows the whole apparatus, partly in front-elevation and partly in section.
  • Fig. 2 shows on a larger scaIe the pisten moved by the pressure liquid and the switch connected therewith, in axial section and partly in elevation.
  • Fig. 3 shows a ground-plan of the switch.
  • Fig. 4 illustrates diagrammatically the electrical circuits employed in the apparatus.
  • I indicates a plate working on a hinge 2 and placed in the roadway, for example 30 metres from the corner or turning of the street, and kept in its highest position by means of a spring 3.
  • a fretting 4 Under the plate there is placed a pisten 4, on the upper end of which the plate i rests, which piston can be made to move vertically in a cylinder 5.
  • springs 24 In the cylinder, beneath the pisten, are placed springs 24, which tend to keep the pisten 'in its highest position.
  • the cylinder 5 is connected through a pipe 6 with another cylinder 1, which'likewise contains a vertically movable pisten 8.
  • the cylinders 5 and 'l and the pipe 6 are filled with a liquid.
  • a flapvalve 9 which prevents return-flow of the 'liquid from the cylinder l to the pipe 6. Such return flow can take place only'through the by-pass Io, and the resistance to flow through this by-pass can be regulated by means of the adjusting screw 'I I.
  • the piston 8 is at its upper end provided with an upwards projecting piston-rod l2, the upper end of which bears a cross-piece !3, which is electrically insulated from the piston-rod by means of the insulation 26.
  • the cross-piece [3 bears two arms, rotatable on parallel horizontal axles [4, lt', which are held apart from each other by the pressure of a spring l5.
  • the arms !4, l4' have at their upper ends contact-rollers lE, 16'.
  • Each of the contact-rollers !6, IS' acts together with a set of contact-bars l'l, !8, l! and
  • the bars in each set are arranged in succession to each other at the bottom of the guidinggrooves 20, 20', executed in insulating material,
  • denotes a signal-post provided with a, green light 22 for the "clear-signal and red lights 23 for the stop"-signa1.
  • the clear"-signal 22 is in a circuit embracing the contact-members ll, ll', while the "stop"-signals 23 are in another circut embracing the contact-members 18', IS' on the one side and !8, !9 on the other side.
  • 21 and 28 denote coupling-boxes for the conducting-wires, not shown.
  • tion of the stop"-signa1 can be regulated asdesired.
  • the switch may be located overground, for instance in a tightly closed box at the side of the street or road, or possibly in the signal-post.
  • This latter embodiment involves the advantage crossings or the like wherein a signal device is provided at the crossing and its operation is controlled by an Operating unit mounted to be responsive to traflic approaching the crossing, an Operating unit comprising, a box having a top lid positioned substantially at the level of the street and adapted to be depressed by the passage of a vehicle, a cylinder ⁇ and piston unit mounted in operative relationship with respect to said lid whereby the depressing of the' lid causes relative movement between the piston and the cylnder, a fluid-operated switch connected to said cylinder through Conduit means and adapted to be operated by the fluid displaced due to the relative movement of said cylinder and pisten; said switch comprising an upright cylinder having a free inlet valve and an adjustable restricted outlet means and a piston Operating in said cylinder and having rigidly mounted thereon a conducting element, and switch contact means adapted to be bridged by said conducting element.
  • said switch contact means comprises two sets of Contacts spaced apart and insulated from 'each other with the result that when the conducting element is in a first position it bridges one set of Contacts and when it is in a second position it bridges the other set of Contacts.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Actuator (AREA)
US419794A 1939-12-01 1941-11-19 Fluid operated switch Expired - Lifetime US2371909A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO2371909X 1939-12-01
GB2961945A GB600435A (en) 1945-11-07 Automatic signalling-apparatus for street-crossings and the like

Publications (1)

Publication Number Publication Date
US2371909A true US2371909A (en) 1945-03-20

Family

ID=32109276

Family Applications (1)

Application Number Title Priority Date Filing Date
US419794A Expired - Lifetime US2371909A (en) 1939-12-01 1941-11-19 Fluid operated switch

Country Status (4)

Country Link
US (1) US2371909A (enrdf_load_stackoverflow)
BE (1) BE442122A (enrdf_load_stackoverflow)
CH (1) CH222918A (enrdf_load_stackoverflow)
NL (1) NL57527C (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2793264A (en) * 1954-03-29 1957-05-21 Chicago Elevator And Machine C Elevator signal control
US3054087A (en) * 1958-12-29 1962-09-11 Rue L Clegg Excessive speed warning system for traffic control
US3196386A (en) * 1960-07-23 1965-07-20 Rossi Bruno Automatic traffic regulating system for street intersections
US4716413A (en) * 1986-02-05 1987-12-29 Ernest Haile Drunk driver detection system
US5841368A (en) * 1994-03-31 1998-11-24 Bryant; Jim Samuel Device for positioning a vehicle in relation to the walls of a garage, and/or in relation to an adjacent vehicle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1006070A3 (nl) * 1992-07-03 1994-05-03 Moens August Inrichting voor het komprimeren van fluida.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2793264A (en) * 1954-03-29 1957-05-21 Chicago Elevator And Machine C Elevator signal control
US3054087A (en) * 1958-12-29 1962-09-11 Rue L Clegg Excessive speed warning system for traffic control
US3196386A (en) * 1960-07-23 1965-07-20 Rossi Bruno Automatic traffic regulating system for street intersections
US4716413A (en) * 1986-02-05 1987-12-29 Ernest Haile Drunk driver detection system
US5841368A (en) * 1994-03-31 1998-11-24 Bryant; Jim Samuel Device for positioning a vehicle in relation to the walls of a garage, and/or in relation to an adjacent vehicle

Also Published As

Publication number Publication date
BE442122A (enrdf_load_stackoverflow)
CH222918A (de) 1942-08-15
NL57527C (enrdf_load_stackoverflow) 1900-01-01

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