Powered fastener driving tools and clean lubricants therefor

Abstract

Various embodiments of the present disclosure provide powered fastener driving tools and clean lubricants for powered fastener driving tools that reduce contaminant, residue, and deposit buildup or accumulation in the powered fastener driving tools, and thus reduce necessary maintenance for such powered fastener driving tools (or increases the time intervals between such necessary maintenance of powered fastener driving tools).

Claims

1. A method of operating a combustion powered fastener driving tool, said method comprising: removably receiving in a housing assembly a combined fuel supply and clean lubricant supply container containing a mixture of a hydrocarbon fuel and a clean lubricant, wherein the clean lubricant includes a light mineral based oil that does not solidify under combustion powered fastener driving tool conditions, and wherein the mixture includes a determined amount of the light mineral based oil added to the hydrocarbon fuel based on a viscosity of the light mineral based oil and an evaporation rate of the light mineral based oil; and responsive to activation of a workpiece contact element supported by the housing assembly and activation of a trigger mechanism assembly supported by the housing assembly, causing a combustion power supply assembly positioned in the housing assembly to combust the mixture of the hydrocarbon fuel and the clean lubricant and co-act with a fastener driving assembly supported by the housing assembly to a drive fastener provided by a fastener supply assembly supported by the housing assembly.

2. The method of claim 1, where the viscosity of the light mineral based oil is lower than 200 Saybolt universal second (SUS) at 100° F. using the American Society for Testing and Material (ASTM) D 445 method.

3. The method of claim 1, where the light mineral based oil has an evaporation time lower than 200 hours per gram at 120° C.

4. The method of claim 1, wherein the mixture of the hydrocarbon fuel and the clean lubricant is approximately 98% fuel and approximately 2% clean lubricant.

5. The method of claim 1, wherein the mixture of the hydrocarbon fuel and the clean lubricant is approximately 99% fuel and approximately 1% clean lubricant.

6. A method of making a combustion powered fastener driving tool combined fuel supply and clean lubricant supply container assembly, the method comprising: providing a container attachable to a combustion powered fastener driving tool; adding a hydrocarbon fuel to the container; and adding a clean lubricant to the container, wherein the clean lubricant includes a light mineral based oil that does not solidify under combustion powered fastener driving tool operation conditions, and a determined amount of the light mineral based oil added to the container is based on a viscosity of the light mineral based oil and an evaporation rate of the light mineral based oil.

7. The method of claim 6, where the viscosity of the light mineral based oil is lower than 200 SUS at 100° F. using ASTM D 445.

8. The method of claim 6, where the light mineral based oil has an evaporation time lower than 200 hours per gram at 120° C.

9. The method of claim 6, wherein the mixture of the hydrocarbon fuel and the clean lubricant is approximately 98% fuel and approximately 2% clean lubricant.

10. The method of claim 6, wherein the mixture of the hydrocarbon fuel and the clean lubricant is approximately 99% fuel and approximately 1% clean lubricant.

11. A method of operating a pneumatic powered fastener driving tool, the method comprising: dispensing from a clean lubricant supply container a clean lubricant into a pressurized air stream that flows through a housing assembly of the pneumatic powered fastener driving tool, wherein the clean lubricant includes a light mineral based oil that does not solidify under pneumatic powered fastener driving tool operation conditions; and responsive to activation of at least one of a workpiece contact element and a trigger mechanism of the pneumatic powered fastener driving tool, causing the pressurized air stream to cause a fastener driving assembly of the pneumatic powered fastener driving tool to drive a fastener.

12. The method of claim 11, where the clean lubricant is a light mineral based oil with an evaporation time lower than 200 hours per gram at room temperature.

13. The method of claim 12, which includes causing a clean lubricant transfer member to transfer the clean lubricant from the clean lubricant supply container to the pressurized air stream.

14. The method of claim 13, wherein the clean lubricant transfer member includes a removable fiber positioned in the clean lubricant supply container.

15. The method of claim 13, wherein a first end of the clean lubricant transfer member is positioned in the clean lubricant supply container and a second end of the clean lubricant transfer member extends from a port defined in the clean lubricant supply container and is positioned in the pressurized air stream.

16. The method of claim 13, which includes connecting the clean lubricant supply container to the housing assembly of the pneumatic powered fastener driving tool.

17. The method of claim 13, which includes positioning the clean lubricant supply container in the housing assembly of the pneumatic powered fastener driving tool.

18. The method of claim 13, which includes connecting the clean lubricant supply container to a pressurized air supply line connectable to the housing assembly of the pneumatic powered fastener driving tool.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) FIG. 1 is a graph showing Normalized Lubricant Evaporation Curves at 120° C.

(2) FIG. 2 is a side diagrammatic perspective view of a powered fastener driving tool of one example embodiment of the present disclosure.

(3) FIG. 3 is a side diagrammatic perspective view of a powered fastener driving tool of another example embodiment of the present disclosure.

DETAILED DESCRIPTION

(4) Various embodiments of the present disclosure provide powered fastener driving tools and clean lubricants that reduce contaminant, residue, and deposit build-up and/or accumulation in the powered fastener driving tools and thus reduce needed maintenance of the powered fastener driving tools.

Clean Lubricant for Powered Fastener Driving Tools

(5) Various embodiments of the present disclosure provide a clean lubricant for powered fastener driving tools that reduces contaminant, residue, and deposit buildup and/or accumulation in such powered fastener driving tools. These clean lubricants of the present disclosure thus reduce necessary maintenance for such powered fastener driving tools (or increase the time between necessary maintenance of such powered fastener driving tools). Various embodiments of the present disclosure also provide a clean lubricant for mixing with a fuel and for use in the direct combustion with mixed fuel.

(6) In various embodiments of the present disclosure, the clean lubricant is a mineral based lubricant.

(7) In various embodiments of the present disclosure, the dean lubricant is a mineral oil with specific evaporation rate range and without solidification under long time high pressure and temperature operations.

(8) In various embodiments, the clean lubricant is a liquid mineral oil that will not gel, will not cross-link, and will not solidify under normal tool operating conditions of a powered fastener driving tool in which it is employed.

(9) In various embodiments of the present disclosure, the clean lubricant is in a liquid form that tolerates dusts from working field without chemical reactions. In these embodiments, the dusts, such as steel flash particulates, are not catalysts for the clean lubricant and do not cause cross-linking.

(10) In various embodiments of the present disclosure, the clean lubricant is or is based on an environmental friendly liquid mineral oil.

(11) In various embodiments of the present disclosure, the clean lubricant is relatively thermally stable in a combustion chamber such as a combustion chamber of a powered fastener driving tool. More specifically, various mineral oils of the present disclosure show certain combustion but generally do not accumulate in a combustion chamber.

(12) In various embodiments of the present disclosure, the clean lubricant is a mineral oil that does not gel and has a viscosity that satisfies the desired lubrication characteristics and release characteristics from the substrate surfaces. This enables dust and soot residue to be blown away from the combustion chamber by the gas pressure that occurs in from the combustion cycles in combustion powered tools (such as cordless combustion powered tools) or that occurs from the compressed air flow in pneumatic powered tools.

(13) In various embodiments, the clean oil lubricant is a light mineral based oil with a viscosity lower than 200 Saybolt universal second (SUS) at 100° F. using the American Society for Testing and Material (ASTM)D 445 method.

(14) In various embodiments of the present disclosure, the clean lubricant is a light mineral based oil identified by the code NS 6016 and available from Syn-Tech Ltd., Addison, Ill. This clean lubricant has not been previously employed in powered fastener driving tools. This clean lubricant has viscosity 7.7 CST@40° C. and flash point at 130° C. More specifically, NS 6016 has the properties set forth in the following Table:

(15) TABLE-US-00002 NS 6016 Properties Viscosity@40° F., CST 7.7  ASTM D 445 Viscosity Index, ASTM D 2270 N/A Lbs/gallon @ 20° C. Specific Gravity @ 20/20° C. 0.82 Open Cup Flash Point ASTM D 92, ° C. (° F.) 130 (266) Water, wt % N/A

(16) In other example embodiments of the present disclosure, the clean lubricant is a light mineral based oil identified by the code Drakeol® 9 available from Penreco, Karns City, Pa. This clean lubricant has not been previously employed in powered fastener driving tools. Drakeol® 9 has the properties set forth in the following Table:

(17) TABLE-US-00003 Drakeol ® 9 Properties Viscosity@100° F., SUS 80/90 ASTM D 445 Viscosity Index, ASTM D 2270 14.2/17   Lbs/gallon @ 20° C. Specific Gravity @ 20/20° C. 0.8537 Open Cup Flash Point ASTM D 92, ° C. (° F.) 199 (390) Water, wt % N/A

(18) In other example embodiments of the present disclosure, the clean lubricant is a light mineral based oil identified by the code Drakeol® 10 available from Prenco. Drakeol® 10 has slightly higher viscosity and flashing point than Drakeol® 9. Drakeol® 10 has the properties set forth in the following Table:

(19) TABLE-US-00004 Drakeol ® 10 Properties Viscosity@100° F., SUS 102/115 ASTM D 445 Viscosity Index, ASTM D 2270 19.0/21.9 Lbs/gallon @ 20° C. Specific Gravity @ 20/20° C. 0.848 Open Cup Flash Point ASTM D 92, ° C. (° F.) 203 (397) Water, wt % N/A

(20) In other example embodiments of the present disclosure, the clean lubricant is a light mineral based oil identified by the code Drakeol® 34 available from Prenco. Drakeol® 34 has slightly higher viscosity and flashing point than Drakeol® 9 and Drakeol® 10. Drakeol® 34 has the properties set forth in the following Table:

(21) TABLE-US-00005 Drakeol ® 34 Properties Viscosity@100° F., SUS 370/410 ASTM D 445 Viscosity Index, ASTM D 2270 72.0/79.5 Lbs/gallon @ 20° C. Specific Gravity @ 20/20° C. 0.858 Open Cup Flash Point ASTM D 92, ° C. (° F.) 246 (475) Water, wt % N/A

(22) In other example embodiments of the present disclosure, the clean lubricant is a light mineral based oil identified by the code BETA FLUID® available from Dielectric Systems Inc. BETA FLUID® has higher flash point and lower viscosity than Ucon. The high flash point reduces the lubricant burning and lower viscosity reduces the lubricant accumulation. Another feature is that this mineral oil does not cross-linking under combustion conditions. BETA FLUID® has the properties set forth in the following Table:

(23) TABLE-US-00006 BETA FLUID ® Properties Viscosity@100° F., SUS 108 ASTM D 445 Viscosity Index, ASTM D 2270 Lbs/gallon @ 20° C. Specific Gravity @ 20/20° C. 0.87 Open Cup Flash Point ASTM D 92, ° C. (° F.) 308 (596) Water, wt % N/A

(24) These example clean lubricants each balance lubricant retention time at the interface between the various tool components (such as metal pieces, o-rings, and plastic junctions) in the gas and liquid phases or states versus lubricant evaporation rate (the hours to evaporate one gram of oil). In other words, these example clean lubricants each do not evaporate too quickly before they are used or while they are being used, but do relatively quickly evaporate after they have been used.

(25) FIG. 1 shows the relative evaporation rates at 120° C. of these example clean lubricants of the present disclosure. More specifically, FIG. 1 shows, for comparison purposes that the known UCON oil (mentioned above) does not evaporate at all while NS 6016 clean mineral oil evaporates relatively fast for 2.77 hours/gram at 120° C. FIG. 1 also shows that the respective Drakeol® 9 and Drakeol® 10 example clean lubricants of the present disclosure have evaporation rates that are between the evaporation rates of NS 6016 clean mineral oil and the known UCON oil.

(26) In one example, a PASLODE XP® framing tool was tested continuously (including 320 fastener drive cycles) in the lab without cooling. This testing showed that the lubrication and evaporation balance that the Paslode XP tool needed was an evaporation rate of between 25 hours/gram to 80 hours/gram. The 320 continuous shots increased the tool temperature of the exhaust and sleeves to about 100 to 130° C. This means that if the evaporation rate is low, there is not enough time for the oil to function to provide the necessary lubrication.

(27) It should be appreciated that the present disclosure contemplates that the clean mineral oil content or ratio in a fuel cell can be changed in accordance with different viscosities. For example, if the viscosity is low, and the NS 6016 clean lubricant evaporation rate is high, and the clean mineral oil content in the fuel needs to be increased to maintain the lubrication function.

(28) More specifically, in various embodiments, NS 6016 mineral oil is added to the fuel at 2% level while the Drakeol® 9 and 10 is at added at a 1% level.

(29) It should further be appreciated that these example clean lubricants of the present disclosure have a reliable gas phase or gaseous state suitable to provide lubrication to lubricate components of a powered fastener driving tool under various different thermal conditions. This enables the clean mineral oil to lubricate where it is needed to reduce extra oil for trapping dusts.

(30) These example clean lubricants can maintain functionality in the gas phase or gaseous state at suitable temperature ranges including −9 to 300° C. (melting temperature to auto-ignition temperature).

(31) These example clean lubricants suitably avoid thermal degradation and oxidation in the gas phase or gaseous state to maintain functionality although part of the clean lubricant may be combusted.

(32) These example clean lubricants of the present disclosure have a reliable liquid state suitable to provide a relatively thin layer of lubrication to lubricate components of a powered fastener driving tool (such as a slidable piston in a cylinder of the tool) under various different thermal conditions.

(33) These example clean lubricants maintain functionality in the liquid state at suitable temperature ranges including −9° C. to 300° C.

(34) These example clean lubricants suitably avoid thermal degradation and oxidation in the liquid state to maintain functionality.

(35) These example clean lubricants balance lubricant retention time in the liquid state versus lubricant evaporation rate.

(36) These example clean lubricants are considered to be safe for contact by humans.

(37) These example clean lubricants minimize contamination of the environment.

(38) It should thus be appreciated that these example clean lubricants: (a) have a relatively low viscosity and is thus flowable at low temperatures; and (b) also have a relatively high flash point and a relatively low boiling point and thus provide protection at relatively high temperatures.

(39) It should also be appreciated that these example clean lubricants do not thermally degrade or “cook” onto hot tool component surfaces, and does not tend to oxidize at the elevated temperatures (such as 300° C.).

(40) It should also be appreciated that these example clean lubricants leave less residue in the tool and thus reduces deposits.

(41) It should also be appreciated that clean lubricants of the present disclosure also function to clean the powered fastener driving tool in situ when the fuel cell contains the clean mineral oil lubricant (as further describe below). Various experiments have shown that the example mineral oil under pressure and hot temperature can blow away deposits and clean the tool internally.

(42) It should also be appreciated that while the pneumatic fastener driving tools do not have combustion cycles, the friction between piston and the sleeve of the tool typically generates certain amounts of heat that will subject the clean lubricant of the present disclosure to evaporation. For example, the NS 6016 clean mineral oil of the present disclosure will evaporate between 25 to 80 hours/grams and is thus suitable for pneumatic tool lubrication in situ.

1st Example—Pneumatic Powered Fastener Driving Tool

(43) Referring now to FIG. 2, a pneumatic powered fastener driving tool of one example embodiment of the present disclosure is generally illustrated and indicated by numeral 10. Pneumatic powered fastener driving tools are generally well-known in the industry, and thus not described in detail in the present disclosure. The tool 10 generally includes a housing 12 having a handle or handle portion 14 including or defining an air port or air inlet 16 through which pressurized air is supplied via a suitable connection to a hose (not shown) and an air compressor (not shown). The housing 12 defines one or more interior chambers such as an interior chamber 18 that function as pressurized air reservoirs. The tool 10 has and/or is configured to support a suitable fastener magazine 22 (which may or may not be removable from the tool). The fastener magazine 22 is configured to hold multiple fasteners 20 loadable into the magazine 22.

(44) The example tool 10 further includes a suitable power unit 24 in the housing 12. In this example, the power unit 24 includes a cylinder 26 surrounded by the air chamber 18. The power unit 24 of the tool 10 includes a bumper 28 at a lower end of the cylinder 26 and a piston 30 configured to slidingly reciprocate within the cylinder 26. FIG. 2 shows the piston 30 in a pre-firing position. During a fastener-driving or power stroke, a trigger valve 32 controllable by a user causes a release of a dose of pressurized air from within the chamber 18 and sufficient for driving the piston 30 downwardly in the cylinder 26 towards the bumper 28. The power unit 24 of the tool 10 includes a driver blade 34 depending from the piston 30 that is configured to engage a forward most fastener (such as fastener 20a) urged into a nose or shear block 36, and to ultimately drive the fastener into a workpiece. After the driving cycle, the piston 30 is returned to the pre-firing position by a blast of pressurized air delivered by or from a return chamber 38 in the housing 12. The return chamber 38 is separate from the main chamber 18 and receives its supply of pressurized air from the cylinder 26 during the driving cycle.

(45) In this illustrated example embodiment, the tool 10 further includes a clean lubricant supply mechanism in the housing 12. The clean lubricant supply mechanism includes a clean lubricant supply container 100 suitably positioned in and secured in the housing 12. In this illustrated example embodiment, the clean lubricant supply container 100 is securely positioned in the handle of the housing 12; however, it should be appreciated that it can be positioned in other locations in the housing in accordance with the present disclosure. The clean lubricant supply container 100 is configured to continuously provide the clean lubricant contained in the clean lubricant supply container 100 to a high pressure air stream that flows into the housing 12 of the tool 10 through the inlet or port 16 in the handle 14 to power the tool 10.

(46) In this illustrated example embodiment, the clean lubricant supply container 100 is a metal based container. The clean lubricant supply container can be any suitable container in accordance with the present disclosure. The clean lubricant supply container includes at least one opening or outlet port (through which a clean lubricant transfer or communication siphon material extends (as described below) and at least one closable opening or inlet port for facilitating filling the clean lubricant supply container in the housing. The container may include other closeable or opening ports. Likewise, in this example, the housing can include one or more closeable openings or ports to provide access to the container for filling purposes.

(47) In this example embodiment, the clean lubricant supply mechanism includes a replaceable clean lubricant transfer or communication siphon material (not shown) of a suitable length that is configured to cause a transfer of the clean lubricant stored in a liquid form in the clean lubricant supply container 100 to a gaseous state in the pressurized air stream. In other words, the replaceable clean lubricant transfer or communication siphon material forms or makes a connection between the clean lubricant oil stored in a liquid phase in the clean lubricant supply container to a gas phase or gaseous state in the air stream. In various example embodiments, the replaceable clean lubricant supply transfer material includes a suitable replaceable fiber or thread such as a suitable a cotton fiber or cellulose fiber.

(48) In various example embodiments, one end of the clean lubricant transfer or communication siphon material is positioned in the liquid clean lubricant oil in the clean lubricant supply container and the other end of the clean lubricant transfer or communication siphon material is positioned in a high pressure air communication line in the handle 14 of the housing of the tool 10. The high pressure air stream causes the evaporation of the clean lubricant in the clean lubricant transfer or communication siphon material into the high pressure air stream. The high pressure air steam carries the clean lubrication gas vapor in the air stream to the various parts of the tool for lubrication purpose. This provides continuous lubrication during operation of the tool 10. This combination of the clean lubricant and the delivery of the clean lubricant into the pressurized air stream reduces or eliminates accumulation of contaminants, residue, and deposits in the tool 10, makes the tool operation much smoother, and increases the time between necessary maintenance intervals.

(49) It is expected that in this illustrated example embodiment, approximately 10 milli-liters of the example clean lubricant NS 6016 would last approximately 200 continuous working days and thus would not have to be replaced or refilled often.

2nd Example—Pneumatic Powered Fastener Driving Tool

(50) Referring now to FIG. 3, a pneumatic powered fastener driving tool of another example embodiment of the present disclosure is generally illustrated and also indicated by numeral 10. This example embodiment is the same as the example embodiment of FIG. 1 except that in this illustrated example embodiment, the clean lubricant supply mechanism is not inside the housing 12 but rather is removably connectable to the housing 12. More specifically, this clean lubricant supply mechanism includes a clean lubricant supply container 200 attached to an air communication line or director that is removably connectable to the housing 12, and specifically the handle 14 of the housing in this example embodiment.

(51) In this illustrated example embodiment, the clean lubricant supply container 200 is a metal based container. This clean lubricant supply container can be any suitable container in accordance with the present disclosure. This clean lubricant supply container includes at least one opening or outlet port (through which a clean lubricant transfer or communication siphon material extends (as described below) and at least one closable opening or inlet port for facilitating filling the clean lubricant supply container in the housing. The container may include other closeable or opening ports.

(52) In this illustrated example embodiment, the clean lubricant supply mechanism includes a replaceable clean lubricant transfer or communication siphon material (not shown) of a suitable length that is configured to cause a transfer of the clean lubricant stored in a liquid form in the clean lubricant supply container 200 to a gaseous state in the pressurized air stream. In other words, the replaceable clean lubricant transfer or communication siphon material forms or makes a connection between the clean lubricant oil stored in a liquid phase in the clean lubricant supply container to a gas phase or gaseous state in the air stream. In various example embodiments, the replaceable clean lubricant supply transfer material includes a suitable replaceable fiber or thread such as a suitable a cotton fiber or cellulose fiber.

(53) In various example embodiments, one end of the clean lubricant transfer or communication siphon material is positioned in the liquid clean lubricant oil in the clean lubricant supply container and the other end of the clean lubricant transfer or communication siphon material is positioned in an air communication line or director 2 that is removably connectable to the housing 12, and specifically the handle 14 of the housing in this example embodiment. The high pressure air stream causes the evaporation of the clean lubricant in the clean lubricant transfer or communication siphon material into the high pressure air stream. The high pressure air steam carries the clean lubrication gas vapor in the air stream into the housing 12 and to the various parts of the tool for lubrication purpose. This provides continuous lubrication during operation of the tool 10. This combination of the clean lubricant and the delivery of the clean lubricant into the pressurized air stream reduces or eliminates accumulation of contaminants, residue, and deposits in the tool 10, makes the tool operation much smoother, and increases the time between necessary maintenance intervals.

(54) It is expected that in this illustrated example embodiment, approximately 10 milli-liters of the example clean lubricant NS 6016 would last approximately 200 continuous working days and thus would not have to be replaced or refilled often.

3rd Example—Pneumatic Powered Fastener Driving Tool

(55) Various other example embodiments of the present disclosure (which are not shown) provide a pneumatic powered fastener driving tool including a housing, and a clean lubricant supply container otherwise connected or connectable to a either (a) a pneumatic supply source; or (b) to a pneumatic air supply hose or line that is connectable to: (i) a pneumatic supply source at one end; and (ii) to the inlet or port of the handle of the housing at the other end. In such embodiments, the clean lubricant supply container is configured to continuously provide clean lubricant contained in the clean lubricant supply container to high pressure air stream (in the same manner as described above) before the high pressure air flows into the tool to power the tool. In various such embodiments, a clean lubricant transfer or communication siphon mechanism such as a clean lubricant transfer or communication siphon fiber or thread is employed to cause a transfer of the clean lubricant into a liquid state in the clean lubricant supply container to a gaseous state in the pressurized air stream.

4th Example—Combustion Powered Fastener Driving Tool

(56) Various other example embodiments of the present disclosure provide a combustion powered fastener driving tool (not shown) that includes, among other components, a housing and a clean lubricant supply container (not shown) positioned in the housing (not shown) of the tool and configured to continuously provide liquid clean lubricant contained in the clean lubricant supply container to mix with fuel that enters a combustion chamber (not shown) in the tool and that powers the tool. In this example embodiment, the clean lubricant supply container can be a metal based container or any other suitable container. This clean lubricant supply container includes at least one opening or outlet port and at least one closable opening or inlet port for facilitating filling the clean lubricant supply container in the housing. The container may include other closeable or opening ports. Likewise, in this example, the housing can include one or more closeable openings or ports to provide access to the container for filling purposes. Alternatively, this clean lubricant container may be removable positioned in the housing or removably attached to the housing.

(57) Thus, in various such embodiments, the present disclosure provide a powered fastener driving tool comprising: (a) a housing assembly including a main compartment assembly and a handle assembly extending from the main compartment assembly, said housing assembly configured to removably receive a fuel supply container and to receive or support a clean lubricant supply container containing a clean lubricant; (b) a combustion power supply assembly positioned in the housing assembly; (c) a fastener supply assembly configured to receive fasteners and supported by the housing assembly; (d) a fastener driving assembly positioned in the housing assembly; (e) a trigger mechanism assembly supported by the handle assembly; and (f) a workpiece contact element assembly supported by the housing assembly.

(58) In various such embodiments, the clean lubricant is a light mineral based oil identified by the code NS 6016 and employed in a ratio of approximately 2% of the amount of fuel. In other words, the mixture of hydrocarbon fuel and clean lubricant in this example embodiment is approximately 98% fuel and approximately 2% clean lubricant.

(59) In various such embodiments, the clean lubricant is a light mineral based oil identified by the code Drakeol® 9, Drakeol® 10, or BETA FLUID® and employed in a ratio of approximately 1% of the amount of fuel. In other words, the mixture of hydrocarbon fuel and clean lubricant in this example embodiment is approximately 99% fuel and approximately 1% clean lubricant.

5th Example—Combustion Powered Fastener Driving Tool

(60) Various other example embodiments of the present disclosure provide a combustion powered fastener driving tool (not shown) that includes, among other components, a housing (not shown) and a combined fuel supply and clean lubricant supply container (not shown) removably positioned in the housing or removably connected to the housing and configured to provide a mixture of clean lubricant and fuel that is contained in the combined fuel supply and clean lubricant supply container to a combustion chamber (not shown) in the tool and that powers the tool.

(61) In various such example embodiments of the present disclosure, a combined fuel supply and clean lubricant supply container containing a suitable fuel (such a known hydrocarbon fuel) and the clean lubricant of the present disclosure can be employed in a variety of currently known or commercially available combustion fastener driving tools to provide a mixture of clean lubricant and fuel that is contained in the combined fuel supply and clean lubricant supply container to a combustion chamber (not shown) in the tool and to power the tool.

(62) In certain tests, the clean oil fuel cell was used to clean used tools that had been used with the known UCON oil. These tests showed that the clean oil of the present disclosure can dissolve some residue and loosen the interface area between the gummy residue and the tool parts. With the pressure and heat from such tools, the residues from used tool were removed using the clean oil fuel cell of the present disclosure. Thus, it should be appreciated that existing used tools in the market can benefit from the clean oil technology to maintain the tool for longer life.

(63) In various such embodiments, the present disclosure provides a powered fastener driving tool comprising: (a) a housing assembly including a main compartment assembly and a handle assembly extending from the main compartment assembly, said housing assembly configured to removably receive a combined fuel supply and clean lubricant supply container containing a hydrocarbon fuel and a clean lubricant; (b) a combustion power supply assembly positioned in the housing assembly; (c) a fastener supply assembly configured to receive fasteners and supported by the housing assembly; (d) a fastener driving assembly positioned in the housing assembly; (e) a trigger mechanism assembly supported by the handle assembly; and (f) a workpiece contact element assembly supported by the housing assembly.

(64) In various such embodiments, the clean lubricant is a light mineral based oil identified by the code NS 6016 and employed in a ratio of approximately 2% of the amount of fuel. In other words, the mixture of hydrocarbon fuel and clean lubricant in this example embodiment is approximately 98% fuel and approximately 2% clean lubricant.

(65) In various such embodiments, the clean lubricant is a light mineral based oil identified by the code Drakeol® 9, Drakeol® 10, or BETA FLUID® and employed in a ratio of approximately 1% of the amount of fuel. In other words, the mixture of hydrocarbon fuel and clean lubricant in this example embodiment is approximately 99% fuel and approximately 1% clean lubricant.

Tests of Example Clean Lubricant in Combustion Powered Fastener Driving Tool

(66) Tests were performed on a known commercially available combustion powered fastener driving tool with three different fuel cartridges including: (a) a fuel cell containing hydrocarbon fuel mixed with the clean lubricant of the present disclosure and specifically the NS 6016 clean lubricant (at a 1% ratio to the fuel); (b) a fuel cell containing hydrocarbon fuel mixed with the known UCON oil mentioned above (at a 1% ratio to the fuel as is currently commercially provided in commercially available fuel cells); and (c) a fuel cell containing hydrocarbon fuel with no oil (i.e., oil free). All potential variables in performing these tests with these three fuel cells were the same. The results of these tests were are set forth in the following table:

(67) TABLE-US-00007 Residue Fan Start Fan End (mg) Fuel cells/ Weight Test Weight per 10,000 lubricant oil Shots (g) (g) ΔW (mg) shots Mineral oil 44,817 5.4239 5.4651 41.2  9.19 (1%) UCON oil 13,496 5.4086 5.4373 28.7 21.26 Oil free 13,601 5.4309 5.4356  4.7  3.46

(68) In this test, the tool with oil free fuel cells resulted in hundreds of blank fires because the piston of the tool often did not return to the firing position. The reason for this was that there was no lubrication between piston and sleeve of combustion chamber of the tool. The 1% mineral oil of the clean lubricant of the present disclosure showed significantly better performance and reduced the residue weight by more than half when compared to the known UCON oil mentioned above. Surprisingly, the clean oil residue does not increase with more shots while the known UCON oil does. The explanation is the surface tension of the clean oil on the tool part surface keeps some oil for lubrication, which is essential for the tools.

(69) It should be appreciated that the clean lubricant of the present disclosure may be employed in other tools.

(70) It will be understood that modifications and variations may be effected without departing from the scope of the novel concepts of the present invention, and it is understood that this application is to be limited only by the scope of the claims.