Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
  • B25C1/00—Hand-held nailing tools; Nail feeding devices
  • B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure

Definitions

• the present invention relates to a propellant gas for internal combustion engines Tools, especially for setting tools for fasteners, on the The basis of flammable gases.
• Such combustion powered tools include, for example, a combustion chamber and a piston which is movable in a piston guide and which is guided by the in expanding combustion gases generated in the combustion chamber becomes.
• a combustion chamber By igniting an air / within the combustion chamber
• the piston becomes fuel mixture or by igniting a powder propellant charge moved away from the combustion chamber strikes the fastener and drives this into the documentation material. It depends on the combustion
• the energy of the propellant gas depends very much on the combustion rate which in turn depends on the air / gas ratio.
• Internal combustion powered tools of this type are, for example, from DE-A-40 32 20 and US-A-5 842 623.
• the object of the present invention is therefore a propellant for internal combustion tools, in particular for setting tools for fastening elements indicate which is non-toxic, easily and inexpensively procured can provide the required combustion energy, a targeted adjustment of this combustion energy enables, even at low Temperatures can be used and the aerosol regulations can be observed.
• this object is achieved by using a propellant gas in the form of a mixture of three components in certain proportions, these components can in turn be mixtures.
• the invention therefore relates to the propellant gas according to claim 1.
• the subclaims relate to preferred embodiments of this subject matter of the invention.
• the propellant gas according to the invention is a mixture containing (A) 40 to 70 wt. % Dimethyl ether, nitrous oxide and / or nitromethane, (B) 8 to 20 % By weight of propylene, methyl acetylene, propane and / or propadiene and (C) 20 to 45% by weight of isobutane and / or n-butane, the sum of the constituents being 100 % By weight.
• the components (A), (B) and (C) can each have one or more representatives of the specified combustible gases.
• the component (A) is preferably in an amount of 50 to 60% by weight Component (B) in an amount of 10 to 15 wt .-% and the component (C) in an amount of 25 to 35 wt .-% of the mixture.
• the propellant gas according to the invention preferably contains dimethyl ether as component (A), as component (B) propylene and as component (C) isobutane.
• component (A) dimethyl ether
• component (B) propylene and as component (C) isobutane.
• Propellant a mixture of 58 wt .-% dimethyl ether, 14 wt .-% propylene and 28% by weight isobutane.
• the dimethyl ether preferably used according to the invention as component (A) is known as a coolant and as a propellant for aerosol spray cans. Most recently Time is also being considered using dimethyl ether as a fuel in the automotive industry use, for which reference is made to US Pat. No. 5,626,294 can.
• Dimethyl ether used succeeds in forming a propellant gas which has the desired Evaporation pressure possible even at low temperatures.
• Dimethyl ether has a relatively wide ignition window, i.e. H. a large gas-air ratio, in which the mixture is ignitable.
• Dimethyl ether is not considered classified toxic and it surprisingly causes a higher burning rate than the conventionally used MAPP mixture.
• the molecule The dimethyl ether contains an oxygen atom, which improves combustion leads, which means that when using the propellant according to the invention in percent less air has to be added than with pure hydrocarbons, which in turn means smaller combustion chambers of the combustion powered tools enables and is advantageous with regard to the exhaust gases emitted.
• the evaporation pressure of the dimethyl ether is not too high (5.1 bar (absolute) at 20 ° C and 1 1.7 bar at 50 ° C), making it suitable for filling in aerosol cans is suitable, what the use of the propellant according to the invention in compressed or liquefied form in a pressure vessel with dispensing valve enables.
• combustible gases dinitrogen monoxide which can also be used as component (A) and nitromethane as well.
• the component (B) contains a reactive double bond in its molecule, which leads to a better combustion of the molecule and thus the propellant mixture leads.
• the relatively high evaporation pressure of this component especially of the preferred propylene (10.2 bar at 20 ° C and 5 bar at - 5 ° C) favors the atomization of the other components of the propellant gas through the nozzles when the propellant gas is introduced into the combustion chamber of the tool
• the component (C), namely isobutane, is used to stabilize the mixture. It is gaseous above -11.5 ° C and therefore also allows cheap combustion.
• the combination of dimethyl ether, dinitrogen monoxide and / or nitromethane alone in combination with one another and the other constituents (B) and (C) essential to the invention results in a propellant gas mixture which is distinguished by a surprisingly advantageous balanced combination of physical, chemical and environmental compatibility properties .
• the propellant claimed is characterized by a particularly practical behavior both during production and filling, and, in particular, during handling, in that the mixture easily meets the requirements for aerosols fulfilled, can be removed from the pressure vessel with the usual metering valves without causing problems with the materials of the valves.
• the propellant gas according to the invention exhibits excellent ignitability and combustion speed even at low temperatures (-5 ° C.), as a result of which the fastening elements can be set in a faultless and safe manner even under climatically unfavorable conditions.
• the propellant gas according to the invention can additionally contain at least one lubricant, for example, based on mineral oil or silicone oil, included Lubricate the valve devices used to introduce the propellant gas into the Combustion chamber are required.
• at least one lubricant for example, based on mineral oil or silicone oil, included Lubricate the valve devices used to introduce the propellant gas into the Combustion chamber are required.
• a propellant gas mixture consisting of 58% by weight of dimethyl ether as component (A) 14% by weight of propylene as component (B) and 28% by weight of isobutane as component (C) formed.
• the mixture has an evaporation pressure of 11.6 at 50 ° C cash and thus fulfills the legal aerosol regulations.
• this propellant is a smooth residue-free Combustion with non-toxic, pollutant-free exhaust gases at high Energy release enables, so that the fasteners in problem-free the documents are collected. It has been shown that this Propellant gas can be used without problems even at low temperatures of -5 ° C.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Liquid Carbonaceous Fuels (AREA)
• Lubricants (AREA)
• Cosmetics (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)

Applications Claiming Priority (2)

Publications (2)

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Cited By (3)

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Citations (3)

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• 1999
  • 1999-10-19 DE DE19950348A patent/DE19950348C1/de not_active Expired - Fee Related
• 2000
  • 2000-08-02 KR KR1020000044746A patent/KR20010049966A/ko not_active Application Discontinuation
  • 2000-09-26 EP EP00810884A patent/EP1093889A3/fr not_active Withdrawn
  • 2000-10-04 US US09/680,141 patent/US6607567B1/en not_active Expired - Fee Related
  • 2000-10-18 JP JP2000317410A patent/JP2001164273A/ja active Pending

Patent Citations (3)

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