WO1990013445A1 - Amelioration apportee a un circuit pneumatique de securite pour dispositifs de gonflage a l'air - Google Patents

Amelioration apportee a un circuit pneumatique de securite pour dispositifs de gonflage a l'air Download PDF

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Publication number
WO1990013445A1
WO1990013445A1 PCT/US1989/005837 US8905837W WO9013445A1 WO 1990013445 A1 WO1990013445 A1 WO 1990013445A1 US 8905837 W US8905837 W US 8905837W WO 9013445 A1 WO9013445 A1 WO 9013445A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
pneumatic
duct
valve
pilot
Prior art date
Application number
PCT/US1989/005837
Other languages
English (en)
Inventor
Michael C. Mohs
Original Assignee
Bruno Wessel Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bruno Wessel Limited filed Critical Bruno Wessel Limited
Priority to KR1019900702709A priority Critical patent/KR920700119A/ko
Priority to US07/773,918 priority patent/US5293910A/en
Publication of WO1990013445A1 publication Critical patent/WO1990013445A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S5/00—Servicing, maintaining, repairing, or refitting of vehicles
    • B60S5/04—Supplying air for tyre inflation
    • B60S5/043—Supplying air for tyre inflation characterised by the inflation control means or the drive of the air pressure system

Definitions

  • This invention relates to pneumatic safety circuits for air inflation devices. More particularly, it relates to pneumatic safety circuits that can be installed in the pneumatic circuits of tire inflating machines or tire mounting machines being built by a machine manufacturer and also can be installed on existing tire inflating machines or tire mounting machines which are generally devoid of pneumatically operated safety circuits, to retrofit them and upgrade their safety standards.
  • a supply of high pressure, "shop” air is available to operate the pneumatic portion of tire mounting machines that are used to press, lever, and wedge tires off or onto tire rims or automobile wheels.
  • the same air supply, at the shop pressure usually in the range of 125 and 175 psi, (862 to
  • Control of pressure build-up in the tire generally is achieved by operation of a pneumatic supply valve, either manual or pedal operated, which opens and closes in the line from the shop air supply to the tire being inflated.
  • a pressure gauge in this line indicates, when the supply valve is closed and the line connected to the tire, what the pressure in the tire is. By intermittently operating the supply valve, the build-up of pressure in the tire can be monitored, but careless or inattentive operation of the
  • SUBSTITUTE SHEET supply valve has been known to overinflate and burst tires, causing serious damage to personnel and property.
  • the high pressure air is supplied to the tire through a three-way pilot operated pneumatic valve whose position is alternated between an inflating cycle and a gauging cycle by operation of a pair of time-delay three-way pilot operated pneumatic valves which are set to allow high pressure air to inflate the tire for a first timed period, then interrupt high pressure air to the tire and for a second timed period, generally much briefer than the first timed period, gauge the pressure in the tire and, if the tire pressure has achieved the desired maximum pressure, interrupt the inflating cycle by maintaining the three-way pilot operated pneumatic valve in the gauging position.
  • the safety circuit required the use of two time-delay three-way valves and involves greater expense for construction than can be achieved with the pneumatic circuit of the present invention.
  • the present invention consists of a pneumatic circuit for air inflation devices having a high pressure pneumatic supply line connected to an object to be inflated to a pressure significantly lower than the supply line pressure, through an operator controlled valve in said high pneumatic supply line, said pneumatic circuit comprising:
  • a pneumatic control duct connecting said fourth pneumatic duct through a pneumatic flow control to a first pilot on said three-way pilot operated valve, the bias of said three-way pilot operated valve being adapted to maintain said three-way pilot operated valve in said first position when the pressure in said pneumatic control duct is below the pressure to which the object is to be inflated.
  • Figure 1 is a schematic drawing, using available ANSI symbols, of a pneumatic circuit of the invention incorporated in a simple pneumatic tire inflating device, with some optional features included for increased convenience and assured safety;
  • Figure 2 another embodiment of the invention, is a schematic drawing of a pneumatic circuit similar to Figure 1 and having some different optional arrangements;
  • Figure 3 another embodiment of the invention, is a schematic drawing of another pneumatic circuit having different optional alternative arrangements and being suitable for inflation of truck tires.
  • duct is intended to include any tube, pipe, enclosed channel, enclosed canal, or open- ended line capable of maintaining or conducting air under pressure without loss between its open ends.
  • ANSI American National Standards Institute
  • legend 10 indicates a high pressure air supply line leading from an operator's pedal controlled or manually controlled valve, shown by a conventional sign for a pneumatic supply.
  • the supply conveniently comes from a commercial air compressor at a pressure in the range from 125 psi to 175 psi (862 KPa to 1207 KPa) and most conveniently is in the range of 140 to 150 psi (955 Kpa to 1034 KPa) .
  • the operator controlled valve conveniently is spring biased in the closed position and is maintained open only by the sustained action of an operator, although with pneumatic circuit of the present invention it need not be spring biased. However, it is preferred that it be so
  • air from the supply line 10 passes first through an optional air filter, 11, to remove entrained solids and liquids that could interfere with the operation of pneumatic components.
  • Air from the supply then passes via a first duct to an inlet of a three-way, pilot operated, biased, normally open valve, 13, through which in this first position air passes, then via a second duct 14 to pressurize the pilot of a two-way pilot operated, spring biased, normally closed valve 15.
  • valve 15 opens to pass air at high pressure from duct 12 through third duct 16, valve 15, and fourth duct 17, to the inlet of a tire or other object to be inflated, 18.
  • control duct 38 extending from duct 17 beyond the connection to tire 18 from the supply line, pressure builds up in control duct 38 to ducts leading to fixed choke or other flow control 19 and optional features 21, 22, 23 and 24 to be described later.
  • the fixed choke or flow control 19 reduces the rate at which pressure builds up on the pilot of valves 12 and prolongs the period of application of pressure through line 17 to tire 18 before the pilot closes valve 13 by overcoming its bias. As soon as valve 13 does move to its second position, i.e., close, pressure in duct 14 discharges back through valve 13 to the atmosphere, thus allowing valve 15 to close by its spring bias and thus interrupting flow of high pressure air to duct 17 and tire
  • valve 13 Immediately after valve 15 closes, air pressure on the pilot of valve 13 flows back through choke or flow control 19 and control duct 38, and equilibrates with the pressure in the much larger volume of tire 18. If that pressure then has not reached the value to which the tire is to be inflated and is not sufficient to overcome the bias of valve 13, then valve 13 is reopened by its bias, air supply pressure is applied to the pilot of valve 15, which opens, and high pressure air again is admitted through valve 15 to duct 17 and tire 18 until pressure again builds up on the pilot of valve 13 until it overcomes the bias of valve 13 and again closes it. The cycling of valve 13 closing and opening is repeated until the tire pressure achieves the value at which the bias of valve 13 is selected to allow valve 13 to remain closed.
  • a number of optional features can be added to the circuit to, among other things, increase the safety characteristics of the circuit and increase its flexibility.
  • These features shown in Figure 1 include a first pressure relief means, for example a pop safety valve, a spring check valve, or a side outlet relief valve 21, as illustrated in Figure 1; this means is connected to duct 38 and can be set to discharge to atmosphere at a preselected pressure in duct 38 somewhat above the final pressure to which the tire " 28 is to be inflated, thereby helping to ensure that pressure in duct 38 and tire 28 does not exceed the preselected level.
  • a second optional feature illustrated in Figure 1 is a pressure gauge 22 connected to duct 38 which, when valves 15 and 13 both are closed and duct 38 contains only the pressure in tire 18, registers that tire pressure.
  • a third optional feature illustrated in Figure 1 is a second pressure relief means also connected to duct 38 to serve as a back-up to side outlet relief valve 21, and is shown as a second side outlet valve 23.
  • a fourth optional feature is a pressure
  • SUBSTITUTESHEET bleed valve, 24, which is a spring biased, normally closed, manually opened, two-way valve by which the pressure in duct 38 and tire can be manually discharged to the atmosphere.
  • a final optional feature shown in Figure 1 is an over-ride arrangement by which the tire can be inflated beyond the pressure to which the bias of valve 13 is selected to limit it.
  • the over-ride arrangement includes a spring biased, normally closed, manually opened, two-way valve, 25, connected to duct 16; on being manually opened, valve 25 admits high pressure air supply, through fifth duct 26 to the inlet of a pressure regulator, 27, which can be of adjustable type as illustrated or fixed.
  • the outlet of the pressure regulator is connected by sixth duct 28 to duct 17 and, when valve 25 is open, permits air, at a regulated pressure much lower than the high pressure air supply, to continue inflating the tire at a rate which consequently is much slower than occurs when valve 15 is open.
  • the tire can be further inflated slowly while the pressure therein is monitored, for example visually by pressure gauge 22 to achieve a value exceeding the pressure limit set for the tire by the bias of valve 13.
  • the maximum pressure to which the tire could be inflated by this arrangement is the pressure permitted by the pressure regulator, which pressure can be adjusted if the regulator is of the adjustable type or preselected for an appropriate value if a fixed type regulator is used.
  • the over-ride feature permits the gradual addition of pressure to tire up to an appropriate maximum which is greater than the maximum to which the tire can be safely be rapidly inflated by high pressure air through valve 15 in its open position.
  • Such open position is not maintained when the pressure in tire 18 is sufficient to close valve 13 by overcoming its bias, and thus bleed line 14 and the pilot of valve 15, allowing the spring bias of valve 15 to close same.
  • valve 13 has not been defined simply as a spring bias, although it is shown as such in Figure 1. This is because in practice the bias could be maintained, either in part or completely, by means other than a spring.
  • the embodiments of the invention in Figures 2 and 3 illustrate these two options respectively.
  • the embodiment of the invention illustrated in Figure 2 operates basically in the same manner as that in Figure 1, up to the point where the tire has been inflated to the pressure at which the pressure in control duct 38 remains above that required to overcome the spring bias keeping valve 13 in its first position; at this point valve 13, remains in its second position, line 14 is bled to atmosphere and valve 15 remains closed under its spring bias.
  • a spring biased, normally closed, manually operated, two-way valve, 29, connected to duct 38 is manually opened by the operator to admit air at the pressure in duct 38 and in the tire 18 to the inlet of a pressure regulator, 30, which can be of the adjustable type as illustrated in Figure 2 or a fixed type (not shown) .
  • a pressure regulator 30, which can be of the adjustable type as illustrated in Figure 2 or a fixed type (not shown) .
  • air at reduced pressure from the outlet of the regulator is led by seventh duct, 31, to a second pilot on valve 13.
  • This air pressure on the second pilot adds pilot pressure bias to the open position of the valve, and supplements the bias of the spring which tends to keep valve 13, open, thus overcoming the pressure in duct 38 which has closed valve 13 and permitting it to admit high pressure air to duct 14 again, thus opening valve 15 by its pilot and again admitting high pressure air to line 17 and tire 18.
  • the pressure regulator 30 precludes the pressure on the second pilot from adding more than a preselected amount of bias to the bias provided by the spring of valve 13 (or a fixed amount of bias pressure regulator of the fixed type is used) .
  • valve 29 is manually held open to over-ride the initial bias of valve 13 which limits the pressure built up in tire 18, valve 13 still operates to limit the pressure built up in tire 18, albeit the built-up pressure is greater when valve 29 is open, the increment being set by the setting or characteristics of pressure regulator 30 through which supplemental pressure bias is added to the spring bias of valve 13.
  • a less preferred form of the embodiment of Figure 2 has a simple choke 30A in duct 31 instead of a pressure regulator 30.
  • Such an arrangement permits the over-ride to add an unlimited amount of supplemental pilot pressure bias to the spring bias of valve 13, thus permitting a greater build-up of pressure in the tire, which build-up would have to be monitored visually on the pressure gauge and interrupted by closure of valve 29 when the desired amount of build-up has been achieved.
  • a choke 30A is used instead of a pressure regulating valve 30 in duct 31
  • a third pressure relief means for example a side outlet relief valve, 30B, connected to duct 31 and set to discharge to atmosphere when the pressure in line 31 goes significantly (i.e., to an unsafe level) above that required to provide the necessary pilot pressure and supplementary bias to open valve 13.
  • Pressure relief means 21 and 23 also prevent unlimited build-up from exceeding the safe pressure limit at which these means are designed to discharge control duct 38 to atmosphere, whether they are side outlet relief valves, as shown, or simple pop valves or spring check valves, as mentioned with reference to Figure 1.
  • SUB TITUTESHEET spring bias to hold valve 13 in its normally open position.
  • the circuit of Figure 2 uses spring bias to hold valve 13 in its open position until the optional over-ride feature is manually put into operation, at which time the spring bias is supplemented by pressure in line 31 to a second pilot on valve 13, assisting the spring in maintaining valve 13 open.
  • the circuit of Figure 3 does not have any spring bias to hold valve 13 in its normally open position.
  • the necessary bias to maintain valve 13 in its normally open position is provided by air pressure from first duct 13, taken through an eighth duct, 32, through an adjustable or fixed pressure regulator, 33, and ninth duct, 34, to the second pilot on valve 13.
  • valves 13 and 15 operate exactly as they do in the embodiment described in Figure 1, until the pressure in tire 18 reaches the value to which it is to be inflated and the steady pressure therein, through duct 38 and the first pilot on valve 13, closes valve 13 by overcoming the bias provided by the second pilot and pressure in duct 34.
  • the appropriate pressure in duct 34 to provide the desired bias for the second pilot of valve 13 is obtained by selection of an appropriate fixed pressure regulator 33, or adjustment of an alternative corresponding adjustable pressure regulator to provide only sufficient pressure in duct 34 to maintain valve 13 open until air pressure in tire 18, exerted through control duct 38, has reached the preselected value and closes valve 13 through the first pilot thereon. Should it then be desired to raise the pressure in tire 18 somewhat above the preselected value under manual control, an optional over- ride arrangement is provided by tenth duct 35 connected to
  • SUBSTITUTESHEET the high pressure supply, for example duct 16, and containing a choke 36 and spring biased, normally closed, manually opened, two-way valve 37, discharging into duct 38.
  • the additional pressure thus provided in duct 38 not only ensures that valves 13 and 15 are kept in their closed positions, but also further inflates tire 18 by air flow in duct 38 in direction reverse to the normal air flow in duct 38 during inflation of the tire.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
  • Safety Valves (AREA)

Abstract

La présente invention décrit l'amélioration apportée à un circuit pneumatique par la coupure automatique du flux d'air à haute pression (10) introduit dans un objet (18) à gonfler, par exemple un pneu, lorsque la pression dans cet objet atteint un maximum préalablement fixé, considérablement inférieur à celui de l'alimentation en haute pression (10). L'air à haute pression est introduit dans l'objet (18) et dans un conduit de contrôle (38) qui est également relié à cet objet (18), jusqu'à ce que la pression dans ce conduit (38) surmonte la résistance d'un clapet de commande (13), moment où celui-ci se ferme pour interrompre le flux d'air à haute pression (10) et pour permettre à la pression dans l'objet et dans le conduit de contrôle (38) de s'équilibrer; si la pression équilibrée n'excède plus la résistance du clapet de commande (13), ce dernier se rouvre pour laisser pénétrer davantage d'air à haute pression (10) dans l'objet et dans le conduit de contrôle (38) jusqu'à ce que la résistance de ce clapet (13) soit encore dépassée et que celui-ci se referme comme précédemment, en répétant le processus de fermeture.
PCT/US1989/005837 1989-05-01 1989-12-18 Amelioration apportee a un circuit pneumatique de securite pour dispositifs de gonflage a l'air WO1990013445A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1019900702709A KR920700119A (ko) 1989-05-01 1989-12-18 공기팽창장치를 위한 기압 안전회로
US07/773,918 US5293910A (en) 1989-05-01 1989-12-18 Pneumatic safety circuit for air inflation devices

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA598,396 1989-05-01
CA598396 1989-05-01

Publications (1)

Publication Number Publication Date
WO1990013445A1 true WO1990013445A1 (fr) 1990-11-15

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ID=4139988

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1989/005837 WO1990013445A1 (fr) 1989-05-01 1989-12-18 Amelioration apportee a un circuit pneumatique de securite pour dispositifs de gonflage a l'air

Country Status (2)

Country Link
EP (1) EP0473648A4 (fr)
WO (1) WO1990013445A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761601A (en) * 1953-08-21 1956-09-04 Fred A Van Vooren Air inflating device for tires
US3283775A (en) * 1963-03-15 1966-11-08 Scovill Manufacturing Co Inflating apparatus
US4421151A (en) * 1981-03-05 1983-12-20 Robert Bosch Gmbh Tire-pressure regulating system
US4702287A (en) * 1986-08-22 1987-10-27 Eagle-Picher Industries, Inc. Method and apparatus for controlling the automatic inflation of tires for testing
US4744399A (en) * 1986-07-31 1988-05-17 Paccar Inc. Central tire inflation system
US4782879A (en) * 1985-10-04 1988-11-08 Precision Mecanique Labinal Hydraulic or pneumatic pressure control device and its application in devices regulating the pressure of tires of vehicles in motion
US4872492A (en) * 1988-04-11 1989-10-10 Hennessy Industries, Inc. Pneumatic tire inflator

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1550345A (en) * 1975-08-08 1979-08-15 Dunlop Ltd Inflation apparatus
DE3042728A1 (de) * 1980-11-13 1982-09-09 Otto 4840 Rheda-Wiedenbrück Wollscheid Verfahren und vorrichtung zum fuellen der bereifung von laufraedern

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761601A (en) * 1953-08-21 1956-09-04 Fred A Van Vooren Air inflating device for tires
US3283775A (en) * 1963-03-15 1966-11-08 Scovill Manufacturing Co Inflating apparatus
US4421151A (en) * 1981-03-05 1983-12-20 Robert Bosch Gmbh Tire-pressure regulating system
US4782879A (en) * 1985-10-04 1988-11-08 Precision Mecanique Labinal Hydraulic or pneumatic pressure control device and its application in devices regulating the pressure of tires of vehicles in motion
US4744399A (en) * 1986-07-31 1988-05-17 Paccar Inc. Central tire inflation system
US4702287A (en) * 1986-08-22 1987-10-27 Eagle-Picher Industries, Inc. Method and apparatus for controlling the automatic inflation of tires for testing
US4872492A (en) * 1988-04-11 1989-10-10 Hennessy Industries, Inc. Pneumatic tire inflator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0473648A4 *

Also Published As

Publication number Publication date
EP0473648A1 (fr) 1992-03-11
EP0473648A4 (en) 1993-12-29

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