Tamperproof hydrant lock with controlled shock absorber
First Claim
1. In a fire hydrant including a bonnet having an aperture, a housing having an internal chamber, an operating rod extending within the housing chamber, a yoke coupled to the operating rod, and a plunger coupled to the yoke for opening and closing a valve, a tamperproof lock comprising:
- a spring mounted on the housing;
power transmitting means mounted on the operating rod for transmitting power to said rod against said spring;
first hydraulic means operatively associated with said power transmitting means for controlling gradual opening of the valve over a first delay interval of time; and
second hydraulic means operatively associated with said power transmitting means for controlling gradual closing of the valve over a second delay interval of time.
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Accused Products
Abstract
A tamperproof hydrant lock with a controlled shock absorber. Power transmitting means are mounted on an operating rod extending within a chamber in the hydrant housing. A spring is mounted between the power transmitting means and the hydrant housing. First and second hydraulic means operatively associated with the power transmitting means control gradual opening and closing of the hydrant valve over first and second delay intervals of time respectively.
20 Citations
17 Claims
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1. In a fire hydrant including a bonnet having an aperture, a housing having an internal chamber, an operating rod extending within the housing chamber, a yoke coupled to the operating rod, and a plunger coupled to the yoke for opening and closing a valve, a tamperproof lock comprising:
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a spring mounted on the housing; power transmitting means mounted on the operating rod for transmitting power to said rod against said spring; first hydraulic means operatively associated with said power transmitting means for controlling gradual opening of the valve over a first delay interval of time; and second hydraulic means operatively associated with said power transmitting means for controlling gradual closing of the valve over a second delay interval of time. - View Dependent Claims (2, 3, 4, 5, 6)
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7. In a fire hydrant including a housing having an internal chamber for receiving hydraulic fluid, an operating rod extending within the housing chamber, a yoke coupled to the operating rod, and a plunger coupled to the yoke for opening and closing a valve, the combination comprising:
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a modified retaining ring mounted on the housing; an operating nut converter mounted on the operating rod, said operating nut converter having at least one passage for passing hydraulic fluid in at least a first direction; a pressure plate mounted on said operating nut converter; a swivel plate mounted on said pressure plate for rotational movement thereon, said swivel plate having a contoured central hub portion; a piston ring mounted on said operating nut converter, said piston ring having at least one passage therein for passing the hydraulic fluid in a second direction only; and a spring mounted between the housing and said pressure plate whereby said spring exerts an upward force against the underside of said pressure plate. - View Dependent Claims (8, 9, 10, 11)
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12. In a fire hydrant including a bonnet having an aperture, a housing having an internal chamber, an operating rod extending within the housing chamber, a yoke coupled to the operating rod, and a plunger coupled to the yoke for opening and closing a valve, a tamperproof lock comprising:
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a spring mounted on the housing; power transmitting means mounted on the operating rod for transmitting power to said rod against said spring; first hydraulic means operatively associated with said power transmitting means for controlling gradual opening of the valve over a first delay interval of time; second hydraulic means operatively associated with said power transmitting means for controlling gradual closing of the valve over a second delay interval of time; and power applying means removably mounted on the bonnet for applying power substantially along the axis of the operating rod to move the rod against said spring. - View Dependent Claims (13)
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14. In a fire hydrant including a housing having an internal chamber, an operating rod extending within the housing chamber, a yoke coupled to the operating rod, and a plunger coupled to the yoke for opening and closing a valve, the combination comprising:
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a modified retaining ring mounted on the housing; an operating nut converter mounted on the operating rod, said operating nut converter extending within the housing chamber, said operating nut converter having at least one passage therein for passing hydraulic fluid in at least a first direction; a pressure plate mounted on said operating nut converter; a swivel plate mounted on said pressure plate for rotational movement thereon, said swivel plate having a contoured central hub portion; a piston ring mounted on said operating nut converter, said piston ring having at least one passage therein for passing the hydraulic fluid in a second direction only; a spring mounted between the housing and said pressure plate; a bonnet having an aperture for receiving said contoured central hub portion of said swivel plate; and means removably mounted on said bonnet for exerting a force substantially along the axis of the operating rod to move the rod against said spring and hydraulic fluid.
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15. A fire hydrant including a valve, comprising:
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a bonnet having an aperture; a housing coupled to said bonnet, said housing having an internal chamber; an operating rod extending within said housing chamber for causing a valve to open and close; a spring mounted on said housing; power transmitting means mounted on said operating rod for transmitting power to said rod against said spring; first hydraulic means operatively associated with said power transmitting means for controlling gradual opening of the valve over a first delay interval of time; and second hydraulic means operatively associated with said power transmitting means for controlling gradual closing of the valve over a second delay interval of time. - View Dependent Claims (16, 17)
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Specification