Piston Discharge Patents (Class 169/33)
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Patent number: 11267006Abstract: A pressurizable fluid container apparatus, system and method of use.Type: GrantFiled: December 21, 2020Date of Patent: March 8, 2022Assignee: LunatecInventors: Nick Rhea, Eric Young
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Patent number: 11154665Abstract: The present invention is directed to a device for expression of a hemostatic powder having an elongated reservoir with a manual air pump, such as a bellows, at a proximal end and an expression port at a distal end. A porous filter is slidably disposed within the reservoir between the bellows, a plunger and the expression port, and a spring is disposed within the reservoir between the air pump and the plunger. The powder is disposed within the reservoir between the porous filter and the expression port, and the pump is in a fluid communication with the expression port through the porous filter and through the powder.Type: GrantFiled: November 1, 2019Date of Patent: October 26, 2021Assignee: Ethicon, Inc.Inventors: John Goodman, Alex W. Kiturkes, Jared Schneider
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Patent number: 10226779Abstract: The sprayer comprises a container (1) intended to hold liquid for forming the cleaning mass and pressurized air for spraying it, the container (1) being dismantlably attachable to a head (3) bearing a manual pump (4) to increase the pressure of the air, the head (3) also having a supporting handle (23) with a pushbutton (24) operating the outlet valve (18) for the cleaning mass to the delivery nozzle (22), the sprayer having a manually replaceable mixing device (7, 26) located between the outlet conduit (8) for the liquid from the sprayer container (1) and the outlet of damping mass (20) controlled by the manual valve (18), the mixing device (7, 26) having different passage cross-sections for the liquid and the air present in the container (1) in order to adjust the sprayer to provide cleaning masses with a drier or wetter foam consistency.Type: GrantFiled: August 3, 2015Date of Patent: March 12, 2019Assignee: GOIZPER, S.COOP.Inventor: Mikel Loiti Urquia
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Patent number: 10159861Abstract: A method for delivering a liquid contained in a reservoir, the reservoir having a port for delivering the liquid which is closed off by a blow-out disk that is removable at a threshold pressure applied to the liquid, includes: the combustion of a pyrotechnic charge to generate combustion gases, the pressurization of the liquid by the combustion gases, and the removal of the removable blow-out disk from the delivery port and the delivery of the pressurized liquid. The flow rate of generated combustion gases during the delivery of the liquid ensures virtually constant pressurization of the liquid and thus the delivery of the liquid at a virtually constant flow rate. The pressure of the liquid during the delivery of the liquid varying only by a maximum of +/?30% with respect to its initial value at the time at which the blow-out disk is removed.Type: GrantFiled: June 27, 2014Date of Patent: December 25, 2018Assignee: ARIANEGROUP SASInventors: Jean-Paul Nadeau, Frédéric Marlin, Evrard Borg
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Patent number: 9764890Abstract: A liquid spray dispensing system has a liquid container receivable within a housing, provided in separable housing portions. The liquid container has at least one flexible side or end wall or a slidable end wall, movable by an actuator, to reduce the volume of a liquid storage compartment containing the liquid to be dispensed through a spray nozzle unit operably connected to the liquid storage compartment. By operating the spray nozzle unit, or a switch operably connected to a spray actuator of the spray nozzle unit, the actuator moves the flexible or slidable wall to reduce the volume of the liquid storage compartment, and thereby cause the pressurized liquid to be dispensed through the spray nozzle unit.Type: GrantFiled: March 4, 2014Date of Patent: September 19, 2017Assignee: VEGA INNOVATIONS PTY LTDInventors: Benjamin Cyril Gillespie, David Eric Griffin
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Patent number: 9744545Abstract: A bottle cap assembly for pressurizing a water bottle is described herein. The bottle cap assembly comprises a cap, a teeter valve coupled to the top of the cap, a pressurizing plunger, a hollow pump shaft receiving the plunger, a hollow uptake adapter, a relief tube extension and a flexible conduit.Type: GrantFiled: July 15, 2014Date of Patent: August 29, 2017Assignee: Lunatec, Inc.Inventors: Nick Rhea, Eric Young
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Patent number: 9694384Abstract: A material dispensing assembly (100) and method of operation for converting a portable cartridge dispensing tool to a bag-type dispensing tool is provided in which the assembly includes a single piece piston (110) for advancing material though a material housing (104). The single piece piston (110) includes a substantially square-shaped receptacle (140). The assembly further includes a square shaped drive rack (112) for attaching to the piston (110) at the substantially square-shaped receptacle (140) at a connection end (128). The drive rack (112) further includes a plurality of teeth (142) located thereon. The assembly (100) further has a support (127) with a substantially square profile for receiving and supporting the drive rack (112) during operation such that the construct of the drive rack and piston (110) are prevented from rotating during operation.Type: GrantFiled: November 21, 2014Date of Patent: July 4, 2017Assignee: Meritool, LLCInventors: Timm Herman, Kevin Whited
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Patent number: 9682259Abstract: Fire suppression apparatuses include a housing with gas generant material disposed therein, an initiator for igniting the gas generant material, and a cooling system. The cooling system includes a first chamber with a coolant material disposed therein and a second chamber. The coolant material is caused to flow from the first chamber into the second chamber to cool gas formed by the ignition of the gas generant material upon exiting from the housing under pressure. The cooling system may further include a piston disposed within the first chamber and movable responsive to gas pressure. Methods for cooling a fire suppressant gas and methods for suppressing a fire include flowing a fire suppressant gas into first and second chambers of a cooling system, flowing a coolant material from the first chamber into the second chamber, and contacting the fire suppressant gas with the coolant material to cool the fire suppressant gas.Type: GrantFiled: February 23, 2015Date of Patent: June 20, 2017Assignee: Orbital ATK, Inc.Inventor: William P. Sampson
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Patent number: 9557135Abstract: A water gun is revealed. The water gun includes a jetting outlet and at least one suction inlet. The jetting outlet is disposed on a front plate of a barrel of the water gun while the suction inlet that works like a one-way valve is arranged around the jetting outlet. When the hand grip is pulled out, water outside is drawn into an inner space of the barrel of the water gun through the at least one suction inlet. The water in the inner space of the barrel of the water glue is unable to flow out through the at least one suction inlet when the hand grip is pushed in. Moreover, an inner thread is arranged outside the jetting outlet and used for connecting a ball inflating needle or a bike pump hose for inflation of inflatable toys or balls.Type: GrantFiled: May 22, 2015Date of Patent: January 31, 2017Assignee: DONGGUAN TIGER POINT METAL & PLASTIC PRODUCTS CO., LTD.Inventor: Fa-Kuang Liang
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Patent number: 8991511Abstract: A fluid ejection device for example used as a fire extinguisher in which ejected fluid is an extinguishing agent in liquid or powdery form. The device includes: a cylinder shaped tank, split hermetically, perpendicular to its axis, into two chambers by a piston, slidable axially inside the tank; a first chamber, including a non-gaseous fluid, which communicates with an ejection port closed by a cap, which can open for a pressure greater than or equal to a defined pressure in the first chamber; a second pressurization chamber to be connected to a mechanism increasing pressure in the chamber; and a mechanism to link the piston to the tank in full fixity at a storage position, which mechanism can break and release the piston for axial translation at a pressure higher than or equal to a given pressure in the pressurization chamber, to cause the fluid to be ejected.Type: GrantFiled: December 3, 2010Date of Patent: March 31, 2015Assignee: Airbus Operations S.A.SInventors: Christian Fabre, Alain Bignolais
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Patent number: 8869905Abstract: A fire extinguisher with an actuation mechanism includes a fire extinguisher body filled under pressure with a fire suppressant. The actuation mechanism includes a pneumatically controlled activation piston assembly that functions to control the release of the fire suppressant until desired by the user of the fire extinguisher. The activation piston assembly includes a housing in which a piston is positioned. The housing includes a first end and second end. The first end of the housing is covered with a first cap supporting a spring interposed between the piston and the first cap, and the second end of the housing is provided with a second cap. The piston, under the control of balanced spring bias and pneumatic pressure, allows for time controlled release of the fire suppressant from the fire extinguisher body.Type: GrantFiled: September 27, 2011Date of Patent: October 28, 2014Assignee: Universal Delivery Devices, Inc.Inventors: Robert S. Thomas, III, Edward C. Waters, III
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Patent number: 8517117Abstract: A fire suppression system with a visible status indicator positioned within a ventilation hood of a stove is described. The fire suppression system comprises a container within which resides a fire suppressing material and an expulsion activation mechanism subassembly. The fire suppressing material further comprises a dye colorant material. The system further comprising a light source positioned adjacent and projected through the container such that when the fire suppressant material is present within the container, the light appears to be a different color. The system positioned with a canopy portion of a ventilation hood.Type: GrantFiled: October 15, 2012Date of Patent: August 27, 2013Inventor: Conrad S. Mikulec
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Patent number: 8333247Abstract: The present disclosure provides for an advantageous extinguisher or discharge assembly. In exemplary embodiments, the present disclosure provides for an improved hydro-pneumatic fire extinguisher or discharge assembly. More particularly, the present disclosure provides for an improved hydro-pneumatic fire extinguisher or discharge assembly that is configured and dimensioned to fire or release a fire fighting agent (e.g., a fluid and/or liquid based fire fighting agent) while the extinguisher/assembly is oriented in any position or angle relative to gravity.Type: GrantFiled: November 2, 2011Date of Patent: December 18, 2012Assignee: Hanratty AssociatesInventors: Michael P. Hanratty, Peter C. Hanratty, David G. Horton
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Patent number: 8333246Abstract: The present disclosure provides for an advantageous extinguisher or discharge assembly. In exemplary embodiments, the present disclosure provides for an improved hydro-pneumatic fire extinguisher or discharge assembly. More particularly, the present disclosure provides for an improved hydro-pneumatic fire extinguisher or discharge assembly that is configured and dimensioned to fire or release a fire fighting agent (e.g., a fluid and/or liquid based fire fighting agent) while the extinguisher/assembly is oriented in any position or angle relative to gravity.Type: GrantFiled: January 6, 2011Date of Patent: December 18, 2012Assignee: Hanratty AssociatesInventors: Michael P. Hanratty, Peter C. Hanratty, David G. Horton
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Patent number: 8083003Abstract: A fire extinguisher (50, 50?, 50?) comprises a container (10, 10?) that holds a fire-extinguishing substance and that has a container jacket (12, 12?) closed at both ends, and a piston (20, 20?) which is axially displaceable in the container jacket and which separates a space (22, 22?) for fire-extinguishing substance from an expansion space (24, 24?) in the container. According to the invention, an inner compressed-gas chamber (26, 26?) provided in the container (10, 10?) is spatially separate from the expansion space and serves for controlled pressurizing of the expansion space (24, 24?). The piston (20, 20?) is arranged such that it can be displaced along the compressed-gas chamber (26, 26?).Type: GrantFiled: December 12, 2006Date of Patent: December 27, 2011Assignee: Luxembourg Patent Company S.A.Inventors: Frank Felten, Karl Bermes
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Patent number: 7703544Abstract: Method for setting a leather skin (12) having an outer surface designed to be visible, includes a step of applying a rigidity increasing treatment, a step of setting the skin using a mould cooperating with the outer surface of the skin (12), one at least of the two steps being executed only locally at an elongated part (B) spaced apart from the edge of the skin (12) and substantially parallel to the edge, and a step for facilitating the maintenance of the shape by locally applying a shape maintaining material to the inner surface of the skin (12), in particular a thermoplastic resin (24). The invention is useful for making automotive interior trim.Type: GrantFiled: July 20, 2006Date of Patent: April 27, 2010Assignee: Faurecia Interieur IndustrieInventors: Jonathan Cassaro, Claire Bovyn
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Patent number: 7325622Abstract: Extinguishing-medium container includes a tubular body (2) which can be coupled together with a first and a second end piece (5, 6), which second end piece (6) has at least one outlet duct (33) for ejection of extinguishing medium (26) by a propulsion member (30) The extinguishing-medium container (1) can be charged with extinguishing medium (26) in the whole of its inner space bounded by the inner side (71) of the tubular body (2), the first and second end piece (5, 6) and a separation element (29), which separation element (29) is, in a charged state, arranged closely adjacent to the first end piece (5).Type: GrantFiled: February 13, 2003Date of Patent: February 5, 2008Assignee: Dafo Brand ABInventor: Kjell Sjostrom
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Patent number: 7108074Abstract: The apparatus (1e, 1f) according to the invention has a storage tank (5) which is or can be filled with an active substance (3), a pyrotechnic charge (6; 39) in a first end region (9) of the storage tank (5), a cartridge-case base (13) which can be driven by propellant gases of the fired charge (6; 39) in order to drive the active substance (3) out, and has a unit (7) for atomizing the active substance (3) being driven out, and at least one sensor (35a; 35b) which interacts with the charge (6; 39) in order to initiate the latter. The atomizer unit (7) is formed as an atomizer pipe (7) having a plurality of outlet nozzles (15) in the pipe casing in order to fill a spatial region (14) with a mist of the material of the active substance (3). One (18) of the ends of the atomizer pipe (7) is arranged in a second tank end region (19), facing away from the first and extending from the latter. The apparatus is distinguished by a compact and economical configuration with good automatic filling of a space with mist.Type: GrantFiled: November 14, 2002Date of Patent: September 19, 2006Assignee: Piexon AGInventors: Jürg Thomann, Raphael Fleischhauer
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Patent number: 6871802Abstract: A relatively low pressure inert gas hazard suppression system (20) is provided which is designed to protect a room (22) or the like from the effects of fire or other hazard. The system (20) includes a plurality of pressurized inert gas cylinders (24) each equipped with a valve unit (26); each valve unit (26) is in turn coupled via a conduit (28) to a delivery manifold (30). The respective valve units (26) are operable to deliver gas from the cylinders (24) at a generally constant pressure (usually around 10-100 bar) throughout a substantial portion of the time of gas delivery, to thereby provide effective hazard suppression without the need for expensive high-pressure gas handling and distribution hardware and a reduction in room venting area due to lower room over-pressurization. Each valve unit (26) has a valve body (48) and a shiftable piston-type sealing member (56).Type: GrantFiled: February 27, 2003Date of Patent: March 29, 2005Assignee: Fike CorporationInventors: Bradford T. Stilwell, Michael J. Keiter, Devang Narharilal Patel, Keith Leslie Goodall
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Patent number: 6431465Abstract: An apparatus and process for generating a pulsed high-speed fluid jet that can be used to extinguish fires and/or to launch a projectile. A valve, such as an instant on-off valve, preferably operates in combination with a pressure accumulator. In a controlled manner, a pulsed fluid jet is generated and directed through a nozzle. The nozzle can draw into the fluid-jet an additive. The nozzle may also be used to launch a projectile using the fluid jet as a propellant.Type: GrantFiled: April 18, 2000Date of Patent: August 13, 2002Assignee: Jetec CompanyInventor: Gene G. Yie
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Patent number: 6386293Abstract: A reservoir of super absorbent polymers which can be independently pressurized, remotely stored and a supply of water which is admixed with the SAP at a point closely adjacent of an adjustable nozzle. In one embodiment the system involves a home unit with a portable hand carried reservoir which can be pressurized. Yet another system involves a back pack carried by a homeowner or firefighter for spraying which can be pressurized. Yet another embodiment involves a reservoir which can be independently pressurized with a pump so that any reduction in the water pressure in a tap line can be overcome by the SAP auxiliary pressure delivery. Other embodiments relate to a portable unit containing both the water reservoir and the SAP reservoir to the end that it is self-contained, and the admixing can be a function of wherever the homeowner, firefighter or rescue person should don the equipment.Type: GrantFiled: May 9, 2000Date of Patent: May 14, 2002Inventor: John B. Bartlett
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Patent number: 6371213Abstract: A device for discharging a fire retardant material comprising a housing capable of storing a fire retardant material. The housing has an initiator attached to a first end, while a discharging port is attached at a second end. Additionally, sealed within the housing is a driver which forces the fire retardant material towards the discharging port. The driver follows a path defined by a bypass tube located centrally within the housing. The driver is forced along the path by exit gases created by the initiator attached at the first end. The housing also has a choke assembly located near the second end thereof. The choke assembly selectively controls the rate at which the fire retardant material and the pressurized gases exit through the discharging port. The choke assembly has a choke body with a first and second cavity. Furthermore, choke body has passageways and apertures for directing the flow of both the fire retardant material and the pressurized gases.Type: GrantFiled: February 15, 2000Date of Patent: April 16, 2002Assignee: Autoliv ASP, Inc.Inventors: Bradley W. Smith, William B. Richardson, David W. Parkinson, E. Lee Helms
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Patent number: 6340058Abstract: A fire suppressant device that may be rendered automatic by exposing the device to an elevated temperature. The preferred device comprises a canister housing with a uniform cross section throughout its length, and includes a piston member disposed for sliding movement within the canister housing. The canister housing, preferably cylindrical, for containing a fire suppressant fluid, features in a preferred embodiment a nozzle mechanism that includes a cap member temporarily fixed to the spray nozzle thereof by a solder having a known melting point. Disposed between the cap member and spray nozzle is a compression spring biasing the cap member. When the canister housing is exposed to temperatures of at least the melting point of the solder, the solder melts or softens allowing the cap member to be released under the influence of the compression spring, whereby fire suppressant fluid within the canister housing is released against a fire.Type: GrantFiled: May 30, 2000Date of Patent: January 22, 2002Inventors: Stephen M. Dominick, Robert M. Campisi
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Patent number: 6244523Abstract: A pressurized injector comprises a barrel, an injecting end fastened with one end of the barrel, a piston disposed in other end of the barrel and provided with a pull rod fastened therewith. The piston contains a liquid propellant, which reacts with a powdered propellant contained in a pressure chamber of the barrel to produce gas at such time when the pull rod of the piston is pulled. The gas pressure forces the piston to move toward the injecting end, thereby resulting in the ejection of a filling material contained in the barrel.Type: GrantFiled: May 9, 2000Date of Patent: June 12, 2001Inventor: Chang-Chou Chung
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Patent number: 5992531Abstract: A fire extinguisher including a spring biased plunger controlled by a trigger mechanism wherein the plunger is mounted in a flame retardant compound container and the spring and plunger cooperate, when the trigger mechanism is activated, to discharge flame retardant compound from the container toward a fire. The extinguisher has a handle end and an outlet end at opposite ends of its length such that a user can hold the outlet end in a remote location away from the user when compound is discharged. The extinguisher can also be mounted and provided with a heat sensor for automatic activation.Type: GrantFiled: September 2, 1997Date of Patent: November 30, 1999Inventor: Conrad S. Mikulec
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Patent number: 5899277Abstract: There are described a method and a device for suppressing an explosion-like fire, in particular of hydrocarbons, by means of a fire extinguishing agent, which under pressure at a speed adapted to the speed of propagation of the fire is distributed in the space directly surrounding the source of the fire. To ensure an efficient fire fighting without adversely influencing the environment, it is proposed to spray water as fire extinguishing agent by atomizing the same to form a water mist in a minimum amount of 0.03 l/m.sup.3 from a water reservoir (3) in the space directly surrounding the source of the fire.Type: GrantFiled: April 18, 1997Date of Patent: May 4, 1999Assignee: Intertechnik Techn. Produktionen Gesellschaft m.b.H.Inventors: Arthur Alexander Eisenbeiss, Reinhard Zierler
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Patent number: 5660236Abstract: A nozzle unit for discharging and atomizing a fire or explosion suppressant comprises a rigid-walled cylindrical container having a nozzle portion at one end with radially directed discharge orifices. A rupturable barrier normally blocks the nozzle portion from the interior of the container. At the other end of the container, a piston is positioned so as to be sealingly slidable along the container in response to pressure generated by a gas pressure generator. The moving piston pressurizes the suppressant agent within the hollow interior until the rupturable barrier bursts. The suppresessant agent is accelerated substantially instantaneously and discharged in atomised form through the discharge orifices. The gas pressure generator may be a pyrotechnic gas generator. The arrangement is such that the pressurizing gas does not come into contact with the suppressant agent.Type: GrantFiled: June 28, 1995Date of Patent: August 26, 1997Assignee: Kidde Technologies, Inc.Inventors: Richard F. Sears, Terence Simpson
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Patent number: 5335734Abstract: A pump apparatus dispenses a liquid and additive mixture and has a pump cylinder with intake and discharge ports with associated valves. An additive supply communicates with the pump cylinder to supply additive with liquid drawn into the pump during an intake stroke prior to a discharge stroke during which a mixture of additive and liquid is discharged from the pump. The additive is mixed in the liquid prior to passing into the intake port and is metered to attain the desired concentration. An aerating nozzle receives mixture discharged from the discharge port to produce foam for various applications, such as fire fighting. The aerating nozzle has a restrictor orifice located adjacent and upstream from air entainment opening in the nozzle. The restrictor orifice can be a simple non-tapered cylindrical passage, but for improved foam generation, the orifice can be a diverging passage with a step between inlet and outlet portions of the passage.Type: GrantFiled: May 4, 1993Date of Patent: August 9, 1994Assignee: Scott Plastics Ltd.Inventors: Blayney J. Scott, Barry G. Gilbert, George R. Gowan
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Patent number: 5115947Abstract: A portable, collapsible water tank suitable for use in combatting forest fires and the like that is manufactured from a flaccid synthetic material or a coated fabric which is capable of being ultrasonically welded. The bag is preferably made from a single sheet of material that is folded back upon itself to form a bag having uniformly sized front and rear panels. A filler assembly is mounted in the upper part of the front panel while a quick disconnect coupler is mounted in the lower part of the bag. The edge seams between the panel are welded closed using ultrasonic welding techniques. Radially extended skirts are provided about the bag outside of the seam areas and grommets are mounted within the skirts upon which shoulder straps and handles are either permanently removably secured. A hand-grip is welded to the front face of the tank beneath the filler assembly.Type: GrantFiled: May 16, 1989Date of Patent: May 26, 1992Assignee: D. B. Smith & Co., Inc.Inventors: William J. McDonnell, Alexander C. Sarnacki, Jr., Dean E. Collins
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Patent number: 4917193Abstract: An attachment for a rubber-tired skidder vehicles which is releasably and supportably mountable to the skidder. The attachment comprises a tank which includes a water tank compartment for storing water and a drive tank compartment for storing a hydraulic motor and a pump operable from the motor. Coupling hoses are provided for coupling the hydraulic motor to a hydraulic power supply of the skidder. The attachment further includes a discharge hose, a suction hose and first and second valves such that the tank may be selectively operated to: (1) pump water from the water tank compartment through the discharge hose; (2) pump water from the suction hose to the water tank compartment; or (3) pump water from the suction hose to the discharge hose.Type: GrantFiled: June 20, 1988Date of Patent: April 17, 1990Inventor: Lloyd H. Ockler
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Patent number: 4696347Abstract: An arrangement for propelling liquids over long distances involves enclosing liquid in a plurality of thin plastic spheres having a dimpled surface. The liquid containing spheres are propelled over substantial distances by shooting them from a pipe by means of compressed air.Type: GrantFiled: February 18, 1986Date of Patent: September 29, 1987Inventors: Michael Stolov, Sara Stolov, Adi Stolov, Ilana Stolov-Hecht
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Patent number: 4688643Abstract: A novel portable flexible water tank and pump which can be carried on a firefighter's back and used for fighting forest fires. The water carrying backpack and water pump combination comprises: (a) a flexible hollow waterproof water container; (b) harness means attached to the water container suitable for securing the water container to the back of a human being; (c) means attached to the water container for filling the water container; (d) hand operated water pumping means; (e) means for connecting the hand operated water pumping means with the water container in order to permit water from the interior of the water container to be delivered to the hand operated water pump; and (f) perspiration ventilation means located on the side of the water container which rests against the back of the human being.Type: GrantFiled: April 11, 1986Date of Patent: August 25, 1987Assignee: Fireflex Manufacturing, Ltd.Inventors: Stanley D. Carter, Blayney Scott
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Patent number: 4645487Abstract: The device includes a sprayer of powdered substances having a conveying line which includes a coaxially arranged drain pipe and a catheter. The sprayer includes a piston with a valve and a cylindrical housing having a valve and a diametral partition with an opening. The partition divides the sprayer into a delivery portion and a spraying portion.Type: GrantFiled: June 5, 1984Date of Patent: February 24, 1987Assignee: Vsesojuzny Nauchno-Issledovatelsky Institut Meditsinskikh PolimerovInventors: Nikolai M. Shishov, Vladimir E. Zelenetsky, Nadezhda A. Demina, Ivan M. Bondarev, Alexandr N. Cherny, Anatoly G. Avxentiev, Evgeny E. Rylov, deceased
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Patent number: 4240507Abstract: Fire-fighting apparatus including a main cistern to be suspended from a flying machine and flown to fires. One or more openings in the bottom readily admit water to fill the cistern and are then closed by a gate until the cistern has been flown to the fire. A second cistern contains an additive to be dispensed into the water to help fight the fire. The dispensing apparatus includes a cylinder, a piston in the cylinder, and a piston driver connected to the suspension apparatus. A draw-spring pulls the piston toward the bottom of the water cistern, and the gate is connected to the piston to be closed to seal the cistern when the piston is drawn toward the bottom of the cylinder. A first conduit and first valve control the transfer of the additive from the second cistern to the cylinder when the piston is moving downwardly. A controllable valve and second conduit allow the additive to be transferred from the cylinder to the water cistern when the apparatus reaches the fire area.Type: GrantFiled: May 15, 1979Date of Patent: December 23, 1980Inventor: Eero Hokkanen