JP3158763U - Cooling system for combustion powered fastener drive tools - Google Patents

Abstract

Provided is a cooling system for a combustion power type fastener driving tool in which the temperature level of a fastener driving tool is maintained at a desired temperature level even when heat is generated in each combustion cycle.
A cooling system for a combustion powered fastener drive tool 10 utilizes cooling fin structures 36, 38 provided on the outer wall members of a combustion chamber 14 and a cylinder 16. A fluid passage is formed between the outer tool housing 26 and the cooling fin structure provided in the outer wall member of the combustion chamber and the cylinder, and the cooling outside air passes through the cooling fin structure, so that the combustion chamber and the cylinder of the fastener driving tool The element is effectively cooled.
[Selection] Figure 1

Description

  The present invention generally relates to a combustion power type fastener driving tool, and more particularly, is a new and improved cooling system for a combustion power type fastener driving effect, more effectively cooling the fastener driving tool, The present invention relates to a new and improved cooling system which maintains the temperature level of the fastener-driven tool at a desired temperature level even though there is substantially normal heat generation in each combustion cycle.

  This application claims the priority of US Patent Application No. 60 / 858,358, filed on Nov. 13, 2006.

  Combustion power type fastener driving tools have been conventionally known, and basically include a combustion chamber, and a mixture of fuel and air is ignited in the combustion chamber. A piston cylinder assembly is provided in communication with the combustion chamber, the piston cylinder assembly comprising a piston member movably disposed within the cylinder, the piston member being directed, for example, to the combustion chamber Alternatively, it has a first surface facing the combustion chamber, and the mixture of air and fuel combusted in the combustion chamber acts on the piston member so that the piston member moves from the retracted initial start position to the extended driving position. Pressed and driven. A drive blade is integrally connected to the second surface of the piston member, and the drive blade strikes the fastening element and is pushed out of the fastener drive tool. When the air-fuel mixture is ignited during the combustion phase of the combustion-drive cycle, there is usually a significant amount of heat generated, and the fastener drive tool must be sufficiently engaged to keep the fastener drive tool operating properly. It is very important to cool. More particularly, it is important to properly cool such fuel powered drive tools in order to achieve and maintain the desired power and cycle speed characteristics of such tools. For example, if the tool is not adequately cooled and the overall temperature of the tool is too high, the combustion chamber cannot be filled with a sufficient amount or volume of air or oxygen. Therefore, the desired or necessary stoichiometric ratio of the air / fuel mixture cannot be obtained, and the output parameters or output characteristics of the tool cannot be achieved. Since the output parameters or output characteristics of the tool are not achieved, the fastener cannot be properly driven into the substrate to the desired depth according to the tool specifications. That is, for example, when the fastener is properly driven into the base, the head of the fastener is not flush with or embedded in the outer surface of the base. It protrudes from the surface. Similarly, if the tool is not adequately cooled and the overall temperature of the tool is too high, the exhaust gas or air residing in the combustion chamber will not contract to the desired degree. As a result, the piston cannot fully return to its initial or starting position at the start of a new ignition cycle. Considering that the drive piston cannot achieve a complete drive stroke, this may not only affect the output of the tool, but will also slow down the tool cycle time or operating speed. In addition, the tool may cause incomplete ignition.

  Accordingly, there is a need in the art for an improved new cooling system for combustion powered fastener drive tools. This improved new cooling system cools the fastener drive tool more efficiently, thereby effectively cooling the combustion chamber and cylinder of the fastener drive tool, with substantially normal heat generation in each combustion cycle. Even if there is, the temperature level of the fastener driving tool is maintained at a desired temperature level.

  The foregoing and other objects are achieved by an improved novel jet pump cooling system used in connection with a combustion powered fastener drive tool according to the techniques and principles of the present invention. This improved new jet pump cooling system includes a cooling fin structure provided on the outer wall surface portion of both the combustion chamber and the cylinder of the piston-cylinder assembly. An external tool shroud or external tool housing that surrounds or surrounds the combustion chamber and cylinder is axially oriented between the radial cylindrical space and the outer wall surface portion of the combustion chamber and cylinder and the inner surface of the tool shroud or tool housing. An annular space is formed, and the axially oriented annular space communicates with the radial cylindrical space. Cooling air flows through the radial space and the axial space to exchange heat between the combustion chamber and the cooling fin structure of the cylinder. A jet pump communicates with the axially oriented annular space. The air inlet port is in communication with a radial cylindrical space or an axially oriented annular space, and particularly when the drive piston is in the drive stroke, the desired flow rate is achieved in the radial cylindrical space and the axial direction. It is made to circulate through the annular space oriented in the direction and is cooled by the heat exchange process described above. A fan controlled by temperature can be disposed in the jet pump portion of the cooling system. In addition, the fin structure formed or provided on the outer wall portion of the combustion chamber and the cylinder is arranged so as to overlap in the circumferential direction, and the surface area of the cooling fin structure is reduced while minimizing the radial or diametric dimension of the tool. Can be maximized.

1 is a schematic cross-sectional view of a first embodiment of an improved novel jet pump cooling system constructed in accordance with the principles and techniques of the present invention for use with a combustion powered fastener drive tool, wherein the combustion chamber and cylinder are It has a cooling fin structure provided integrally with its annular outer wall, and a jet pump communicates with the lower end portion on the downstream side in the flow direction in the cylinder, and the piston member ignites the air / fuel mixture in the combustion chamber It is a figure arrange | positioned at the initial start position before being performed. FIG. 2 is a schematic cross-sectional view of a first embodiment of an improved novel jet pump cooling system for use with the combustion powered fastener drive tool shown in FIG. 1, igniting a mixture of air and fuel in the combustion chamber. The piston member has started to move downward in the drawing, the air previously present under the piston member begins to be compressed, exhausted from the cylinder via the jet pump, and the jet pump venturi The flow of the fluid through the section decreases in pressure and the flow velocity increases, whereby the cooled outside air is sucked from the air inlet formed in the upper end portion of the tool housing, and the combustion chamber and the cylinder are integrally provided on the annular outer wall portion. It is the figure which has passed through the cooling fin structure. FIG. 3 is a schematic cross-sectional view of a first embodiment of an improved novel jet pump cooling system for use with the combustion powered fastener drive tool shown in FIGS. 1 and 2 with a piston member passing through an exhaust check valve. Thus, the bottom dead center of the stroke is reached, whereby exhaust gas flows outside through the nozzle member of the jet pump and is sucked from the air inlet formed in the upper end portion of the tool housing, and the combustion chamber and the cylinder are It is the figure which the flow volume of the cooling external air which passes through the cooling fin structure integrally provided in the cyclic | annular outer wall part is increasing. 4 is a schematic cross-sectional view of a first embodiment of an improved novel jet pump cooling system for use with the combustion powered fastener drive tool shown in FIGS. 1-3, wherein the piston member initiates its return stroke. FIG. In addition to the cooling outside air that is sucked from the air inlet formed in the upper end portion of the tool housing and passes through the cooling fin structure in which the combustion chamber and the cylinder are integrally provided on the annular outer wall portion, the outside air is a jet in the reverse mode. It is a figure attracted | sucked by the cylindrical space below a piston member through the venturi part of a pump. FIG. 5 is a schematic cross-sectional view similar to FIG. 4 illustrating a fourth embodiment of an improved novel jet pump cooling system constructed in accordance with the principles and techniques of the present invention for use with a combustion powered fastener drive tool. In the jet pump, a first auxiliary check valve is disposed on the downstream side of the venturi portion of the jet pump, and the air flowing into the lower side of the cylinder and returning to the lower side of the piston member is supplied to the tool housing. The combustion chamber and the cylinder are sucked from an air inlet formed in the upper end portion of the cylinder, and pass through a cooling fin structure provided integrally with the annular outer wall portion, and the inlet to the lower end wall member of the cylinder FIG. 6 is a view in which a check valve is provided and further fresh air is introduced into the lower end of the cylinder during the return stroke of the piston. FIG. 6 is a schematic cross-sectional view similar to FIG. 5 illustrating a fifth embodiment of an improved novel jet pump cooling system constructed in accordance with the principles and techniques of the present invention for use with a combustion powered fastener drive tool. In place of the first auxiliary check valve disposed downstream of the jet pump venturi in the jet pump, a motor-driven fan controlled by a temperature switch includes an external tool housing, a combustion chamber, It is arranged so as to communicate with an annular space between the cooling fin structure provided integrally with the annular outer wall portion of the cylinder, whereby the temperature of the tool detected by the temperature switch becomes a predetermined high temperature level. When it reaches, cooling outside air is sucked from the air inlet formed in the upper end portion of the tool housing, and is integrally provided on the annular outer wall portion of the combustion chamber and the cylinder. Is a diagram to be supplied toward the cooling fin structure. FIG. 6 is a cross-sectional view showing a modified embodiment of a plurality of cooling fins of a cooling fin structure integrally provided on the annular outer wall portion of the combustion chamber and the cylinder, and has a radius so as to have a predetermined length in a radial direction or a diametrical direction. Instead of the cooling fins projecting in the direction, the cooling fins are arranged so as to overlap substantially circumferentially, thereby cooling the tool while substantially reducing the radial or diametrical size of the tool. It is the figure which enabled it to maximize the surface area of a fin effectively. A schematic cross-sectional view somewhat similar to FIG. 5 showing a fourth embodiment of an improved novel jet pump cooling system constructed in accordance with the principles and techniques of the present invention for use with a combustion powered fastener drive tool. In this embodiment, an air inlet formed in the upper end portion of the tool housing is not provided, and an inlet check valve similar to the inlet check valve of the second embodiment shown in FIG. There is no exhaust port formed in the lower part of the side wall of the cylinder which is disposed on the lower end wall member of the cylinder and exhausts the air below the piston member toward the jet pump, and is opposite in the side wall part of the cylinder An exhaust port is formed on the side, and the exhaust port communicates with a nozzle member. Cooling outside air is effectively entrained in the annular space between the tool housing and the cooling fin structure integrally provided on the outer peripheral wall surface of the combustion chamber and the cylinder, thereby drawing the fluid. It is the figure made to pass through the cooling fin structure integrally provided in the outer peripheral wall surface of the combustion chamber and the cylinder in the aspect which extrudes a fluid instead of. FIG. 9 is a schematic cross-sectional view similar to FIG. 8 illustrating a fifth embodiment of an improved novel jet pump cooling system constructed in accordance with the principles and techniques of the present invention for use with a combustion powered fastener drive tool. In this embodiment, an exhaust port is formed in the bottom wall member of the cylinder, not in the lower part of the cylinder side wall, and the plenum chamber controlled by the check valve exhausts from the cylinder during the downward stroke of the piston member. The air under the piston member is stored, and the second control valve is disposed in the fluid line connecting the plenum chamber to the nozzle member, the nozzle member being a tool Air is exhausted into an annular space between the housing and the cooling fin structure integrally provided on the outer peripheral wall surface of the combustion chamber and the cylinder, and the outside air is effectively entrained in this air. Unishi was a diagram.

  Various features and advantages of the present invention will become apparent from the following detailed description of the invention which proceeds with reference to the accompanying drawings. In the accompanying drawings, like reference numerals designate like or corresponding parts.

  With reference to the accompanying drawings, and in particular with reference to FIGS. 1-4, a first implementation of an improved novel jet pump cooling system constructed in accordance with the principles and techniques of the present invention and used in connection with a combustion powered fastener drive tool. A form is disclosed and is indicated generally by the reference numeral 10. More specifically, the combustion power type fastener driving tool 12 includes an annular upper combustion chamber 14 and an annular lower combustion chamber 16 so that the upper end portion of the cylinder 16 communicates with the lower end portion of the combustion chamber 14. It is illustrated as being fixed to. The piston member 18 is disposed at the upper end portion of the cylinder 16 so as to be substantially disposed at the boundary surface between the lower end portion of the combustion chamber 14 and the upper end portion of the cylinder 16 at the start of the driving stroke. Thus, the upper surface portion of the piston member 18 is oriented so as to face the inside of the combustion chamber 14, and the combustion gas acts when the air-fuel mixture is ignited in the combustion chamber 14. Yes. The drive blade 20 is fixed to the lower surface portion of the piston member 18, and as a result, when the piston member 18 moves downward by the action of the combustion gas generated in the combustion chamber 14, the drive blade 20 strikes the fastener. The fastener is then pushed out of the fastener drive tool 12. The upper end portion of the combustion chamber 14 is closed by the upper wall member 22, and similarly, the lower end portion of the cylinder 16 is closed by the lower wall member 24.

  An annular outer shroud or housing 26 is axially and radially spaced with respect to the combustion chamber 14 and cylinder 16, and the outer peripheral surface of the combustion chamber 14 and cylinder 16 and the inner surface of the annular shroud or housing 26 are arranged. An annular first space 28 is defined between the upper wall member 22 of the combustion chamber 14 and the upper wall member 32 of the housing 26 in the axial direction. Two spaces 30 are defined. The cylindrical second space 30 communicates with the annular first space 28. An air inlet port 34 communicating with the cylindrical space 30 is formed in the upper center portion of the tool shroud or housing 26. Furthermore, according to the further principle and suggestion of the improved novel jet pump cooling device 10 according to the first embodiment of the present invention used in connection with the combustion powered fastener drive tool 12, the combustion chamber 14 A cooling fin structure 36 is provided on the outer peripheral portion of the cylinder 16. Similarly, a cooling fin structure 38 is provided on the outer peripheral portion of the cylinder 16. Also according to the further principle and suggestion of the improved novel jet pump cooling device 10 according to the first embodiment of the present invention used in connection with the combustion powered fastener drive tool 12, an external shroud or A portion 40 provided in the housing 26 is shown. The portion extends radially outward from the tool shroud or housing 26 or relative to the shroud or housing such that it is oriented generally perpendicular to the longitudinal central axis 42 of the tool 12.

  More particularly, the radially outwardly extending outer shroud or housing portion 40 is provided with the jet pump assembly 44 of the full jet pump cooling apparatus 10 of the present invention. The jet pump assembly 44 includes an upstream relatively large diameter first portion 46, a relatively small diameter second portion 48 forming a venturi portion, and a downstream relatively small diameter outlet portion. And a third portion 50 that forms The first portion communicates with an annular first space 28 that is axially oriented at its upstream end. The second portion communicates with the downstream end of the relatively large diameter first portion at its upstream end. The third portion communicates with a second portion 48 that forms a relatively small diameter venturi at its upstream end. Further, a normally open first exhaust port 52 is formed in a lower portion of the side wall of the cylinder 16. A second exhaust port 54 controlled by the exhaust check valve 56 is formed in the axially upstream portion of the side wall of the cylinder 16 in the axial direction of the normally open first exhaust port. Further, a nozzle member 58 is provided so as to surround or surround both the normally opened first exhaust port 52 and the second exhaust port. The discharge end portion on the downstream side of the nozzle member 58 discharges into the venturi portion 48 of the jet pump assembly 44. With continued reference to FIGS. 1-4, when a mixture of air and fuel is introduced into the combustion chamber 14 and ignited, the combustible product expands in the combustion chamber 14 and the pressure increases, and the piston member 18 1 is pushed downward from the initial or starting position shown in FIG. 1 to the intermediate position as shown in FIG.

  Thus, the piston member 18 moves downward, the air under the piston member 18 begins to be compressed in the cylinder, and the second valve is opened from the normally opened first exhaust port 52 and the check valve 56 is opened. Directed outward from the exhaust port 52. The exhausted air is directed to the nozzle member 58, then flows through the nozzle member, and is supplied to the venturi section 48 of the jet pump assembly 14. When the exhausted air passes through the venturi 48, the air pressure decreases and the flow velocity increases. As a result, the cooled outside air is sucked or introduced into the tool housing 26 from the air inlet port 34. The cooled outside air flows into the cylindrical space 30, then flows into the annular space 28, and passes around the cooling fin structures 36 and 38 provided on the outer peripheral surface of the combustion chamber 14 and the cylinder 16. This exchanges heat with the combustion chamber 14 and cylinder 16 to effectively cool the combustion chamber and cylinder, thereby ensuring that the temperature of these tool components is maintained at the desired low temperature. As the outside air continues to flow through the tool housing 26, this air is entrained by the air exhausted from the nozzle member 58, passes through the venturi 48 of the jet pump assembly 44, and exits from the outlet 50 of the jet pump assembly 44. Exhausted.

  With particular reference to FIG. 3, when the piston member 18 reaches the bottom dead center of its stroke, the piston member 18 passes through the second exhaust port 52, thereby leaving the combustion chamber and the upper portion of the cylinder 16. Exhaust gas is exhausted from the second exhaust port 54. In this way, the flow rate passing through the jet pump assembly 44 is increased, and as a result, the inflow amount of the cooling outside air is increased. Still referring to FIG. 4, when the piston member 18 begins the return stroke, the check valve closes again and outside air or fresh air is drawn in the opposite direction through the jet pump assembly 44 and the normally open exhaust port. 52 flows from the lower end portion of the cylinder 16 to the lower side of the piston member 18 that moves upward. Further, the fresh air that flows through the jet pump assembly 44 in the opposite direction and is introduced into the lower portion of the cylinder 16 effectively flows in the reverse direction in the nozzle member 58, and the cylindrical space 30 and the annular space 28 are jetted. Because of the communication with the pump assembly 44, the cooled outside air that continues to flow from the inlet port 34 into the upper region of the tool housing 26 is effectively entrained by the fresh air. Thus, during the downward drive stroke of the piston member 18, not only cooling outside air is provided to the combustion chamber 14 and the cooling fin structures 36, 38 of the cylinder 16, but also during the upward return stroke of the piston member 18. In addition, cooling outside air is provided to the cooling fin structures 36 and 38 of the combustion chamber 14 and the cylinder 16.

  Referring to FIG. 5, a second embodiment of an improved novel jet pump cooling system constructed in accordance with the principles and techniques of the present invention and used in a combustion powered fastener drive tool is indicated generally by the reference numeral 110. ing. The components of the improved new jet pump cooling system 110 according to the second embodiment are the same as those of the improved new jet pump cooling system 10 according to the first embodiment, and thus the improvement according to the second embodiment. In the new jet pump cooling system 110, the same components as the improved new jet pump 10 according to the first embodiment are indicated by the same reference numerals in the 100s. Further, for the sake of brevity, only the characteristic configuration of the improved new jet pump 110 according to the second embodiment is different from the characteristic configuration of the improved new jet pump 10 according to the first embodiment. This will be described in detail. Thus, according to the improved novel jet pump 110 of the present invention according to the second embodiment, in the jet pump assembly 144, the first auxiliary check valve is provided downstream of the venturi 148 of the jet pump assembly 144. When the piston member 118 is in the upward return stroke, the fresh air flowing into the lower portion of the cylinder 116 and below the piston member 18 that moves upward is supplied to the outlet of the jet pump assembly 114. As shown in FIG. 4, the air inlet port 134 formed at the upper end of the tool housing 126, as shown in FIG. 4, similar to the improved new jet pump cooling system 10 according to the first embodiment. Is sucked out as cooling outside air.

  Thus, the fresh air is not only introduced into the lower end portion of the cylinder 116 but also introduced through the cooling fin structures 136 and 138 provided integrally on the outer peripheral surface of the combustion chamber 114 and the cylinder 116. Furthermore, an inlet check valve 162 as a second auxiliary check valve is provided on the lower end wall member 124 of the cylinder 162 so that further fresh air is introduced into the lower end portion of the cylinder 116 during the return stroke of the piston. May be. Finally, the cooling ambient air, like the improved novel jet pump cooling system 10 according to the first embodiment, during the downward drive stroke of the piston member 118, as shown in FIG. In addition to being supplied to the cooling fin structures 136, 138 of the cylinder 116, they are also supplied to the combustion chamber 114 and the cooling fin structures 136, 138 of the cylinder 116 during the upward return stroke of the piston member 118.

  Referring to FIG. 6, a third embodiment of an improved novel jet pump cooling system constructed in accordance with the principles and techniques of the present invention and used in a combustion powered fastener drive tool is indicated generally by the reference numeral 210. ing. The components of the improved new jet pump cooling system 210 according to the third embodiment are similar to the improved new jet pump cooling systems 10, 110 according to the first and second embodiments, so that the third In the improved new jet pump cooling system 210 according to the first embodiment, the same components as those of the improved new jet pump 10, 110 according to the first and second embodiments are denoted by the same reference numerals in the 200s. Have been instructed. Further, for the sake of brevity, the improved new jet pump 210 according to the third embodiment differs from the characteristic configuration of the improved new jet pumps 10, 110 according to the first and second embodiments. Only the characteristic configuration will be described in detail. Thus, the improved new jet pump 210 of the present invention according to the third embodiment of the present invention is similar to the improved new jet pump cooling system 110 according to the second embodiment, as shown in FIG. However, instead of the first auxiliary check valve 160 disposed downstream of the venturi 148 of the jet pump assembly 144 in the jet pump assembly 144 of the jet pump cooling system 110, the jet pump assembly A cooling fan 264 is disposed in the outlet portion 250 of 244. The cooling fan 264 is connected to the drive motor 266. The drive motor 266 is connected to the temperature switch mechanism 268. The temperature switch mechanism is fixed to, for example, an outer wall portion of the cylinder 216 in order to detect a temperature level. The temperature switch mechanism 268 may be attached to the outer wall portion 214 of the combustion chamber 214. Power to the temperature switch mechanism 268 is supplied from the tool battery 270. Thus, when the detected temperature reaches a preselected high temperature level, the temperature switch mechanism 268 activates the drive motor 266, that is, the cooling fan 264. Thus, the cooling outside air is sucked through the inlet port, the cylindrical space 230 and the annular space 228 and passes around the cooling fin structures 236 and 238 formed on the outer peripheral wall surfaces of the combustion chambers 214 and 216.

  When the cooling fan 264 is not activated except that the first auxiliary check valve 160 of the jet pump assembly 110 is not provided and fresh air is sucked from the outlet 250 of the jet pump assembly 244 The improved novel jet pump cooling system 210 according to the third embodiment of the present invention is a second implementation as shown in FIG. 5 during the upward movement of the piston member 218 during the return stroke. It works in the same way as the new jet pump cooling system 110, which is improved by configuration. Further, similar to the improved novel jet pump cooling system 110 according to the second embodiment, the cooling fins of the combustion chamber 214 and cylinder 216 during the downward drive stroke of the piston member 218, as shown in FIG. Not only is cooling outside air supplied to the structures 236 and 238, but also cooling outside air is supplied to the cooling fin structures 236 and 238 of the combustion chamber 214 and the cylinder 216 during the upward return stroke of the piston member 218.

  With reference to FIG. 7, an embodiment of a cooling fin 336 is shown. The cooling fins form a cooling fin structure formed integrally with the outer peripheral surface of the combustion chamber 314 of the fastener driving tool of the mouthpiece. Similar cooling fins can be similarly disposed in the cylinder portion of the fastener driving tool. More specifically, the cooling fins 336 are formed between the outer peripheral surface of the root disappearance 314 and the surrounding tool shroud or housing 326. The cooling fins 336 are arranged to generally overlap in the circumferential direction, rather than projecting outward in a radial or diametrical direction substantially perpendicular to the longitudinal central axis of the combustion chamber 314. This effectively maximizes the surface area of the cooling fin 336 while reducing the radial or diametrical extent of the cooling fin 336, ie, the radial or diametric size of the fastener drive tool. In this way, the fastener driving tool can be cooled to a maximum or at least sufficiently without causing dimensional problems with the fastener driving tool.

  Referring to FIG. 9, an improved novel jet pump cooling system constructed in accordance with the principles and techniques of the present invention and used in a combustion powered fastener drive tool, the first and second shown in FIGS. An overall jet pump cooling system according to a fourth embodiment, somewhat similar to the jet pump cooling system according to the present embodiment, is indicated by reference numeral 410. Similar to the previously described embodiments, the components of the improved new jet pump cooling system 410 according to the fourth embodiment are the improved new jet pump cooling system 10 according to the first and second embodiments, 110, the components of the improved new jet pump cooling system 410 according to the fourth embodiment are the same as those of the improved new jet pumps 10, 110 according to the first and second embodiments. The same reference numbers in the 400s are indicated. Furthermore, for the sake of brevity, the improved new jet pump 410 according to the fourth embodiment differs from the characteristic configuration of the improved new jet pumps 10, 110 according to the first and second embodiments. Only the characteristic configuration will be described in detail. Thus, the jet pump assembly 444 of the improved novel jet pump 410 of the present invention according to the fourth embodiment is the jet of the improved novel jet pump cooling system 10 according to the first embodiment shown in FIG. Similar to the pump assembly 44, but the normally open exhaust port 52 of the jet pump cooling system 10 according to the first embodiment is not provided.

  Further, an inlet check valve 462 similar to the inlet check valve 162 of the jet pump cooling system 110 according to the second embodiment shown in FIG. 5 is provided in the cylinder 416 bottom wall member 424. Further, an exhaust port 472 and an exhaust nozzle 474 are provided on the side wall portion of the cylinder 416 substantially opposite to the exhaust port 454. The exhaust nozzle 474 communicates with an annular space 428 formed between the tool shroud or housing 426 and the outer surface of the cylinder 416. The exhaust nozzle 474 is effectively surrounded by the air inlet 476, the inflowing outside air is entrained in the exhaust flow discharged by the exhaust nozzle 474, and fresh air is introduced and supplied to the annular space 428. Moreover, the air inlet port 34 provided in the upper end wall 32 of the tool shroud or the housing 26 in the jet pump cooling system according to the first embodiment shown in FIG. 1 is not provided in this embodiment. Thus, when the piston member 418 moves down during the drive stroke, the air below the piston member 418 is not only the jet pump assembly 444, but also some of this air is exhausted from the exhaust port 472 and the exhaust nozzle. The cooling outside air that is also exhausted from 474 and flows in from the air inlet 476 is effectively entrained. The cooled outside air flowing in this way flows through the annular space 428 and the cylindrical space 30 while generally acting to extrude the fluid, and cools with respect to the cooling fin structures 436 and 438 provided integrally with the combustion chamber 414 and the cylinder 416. Heat exchange.

  Finally, referring to FIG. 9, reference numeral 510 generally designates a fifth embodiment of an improved novel jet pump cooling system constructed in accordance with the principles and techniques of the present invention and used in a combustion powered fastener drive tool. Is instructed. The components of the improved new jet pump cooling system 510 according to the fifth embodiment are the same as those of the improved new jet pump cooling system 410 according to the fourth embodiment shown in FIG. In the improved new jet pump cooling system 510 according to this embodiment, components similar to those of the improved new jet pump 410 according to the fourth embodiment are indicated by the same reference numerals in the 500s. Furthermore, for the sake of brevity, in the improved new jet pump 510 according to the fifth embodiment, only the characteristic configuration different from the characteristic configuration of the improved new jet pump 410 according to the first embodiment will be described. This will be described in detail. Thus, in more detail, the exhaust port 527 is formed not on the lower portion of the side wall of the cylinder 516 but on the lower end wall member 524 of the cylinder 516. An outlet check valve 578 cooperates with the exhaust port 572. Further, a plenum chamber 580 communicates with the exhaust port 572 via an outlet check valve 578. The plenum chamber 580 is also in communication with the outlet nozzle 574 via a control valve 582. Thus, a predetermined volume of air below the piston member 518 that is exhausted to the outside from the lower end portion of the cylinder by the downward movement of the piston member 518 in the cylinder 516 during the drive stroke depends on the opening of the control valve 582. In addition to being able to be stored in the plenum chamber 580, it is further controllably introduced into the exhaust nozzle 574 and entrained outside air from the air inlet 576 for a long time to cool the combustion chamber 514 and the cylinder 516. The cooling effect of the fin structures 536 and 538 can be further enhanced.

  Thus, different embodiments of an improved novel cooling system for a combustion powered fastener drive tool in accordance with the principles and techniques of the present invention have been disclosed. This improved new cooling system uses a cooling fin structure provided in the outer wall member of the combustion chamber and the cylinder. A fluid passage is formed between the inner surface of the tool shroud or housing and the cooling fin structure of the combustion chamber and the four-tiered outer wall member. Thus, the cooling ambient air passes through the cooling fin structure, thereby effectively cooling the combustion chamber and cylinder of the fastener drive tool, so that the temperature of the fastener drive tool is maintained even though there is substantially normal heat generation in each combustion cycle. The level is maintained at the desired temperature level.

  Needless to say, many variations and modifications of the present invention are possible in light of the above-described techniques. Accordingly, even if not specifically described in the present specification, the present invention can be implemented within the scope of the utility model registration request.

DESCRIPTION OF SYMBOLS 10 Jet pump cooling device 12 Combustion power type fastener drive tool 14 Combustion chamber 16 Cylinder 18 Piston member 20 Drive blade 22 Upper wall member 24 Lower wall member 26 Shroud or housing 28 Cylindrical 1st space 30 Cylindrical 2nd Space 32 Upper wall member 34 Air inlet port 36 Cooling fin structure 38 Cooling fin structure 40 Part 42 Longitudinal central axis 44 Jet pump assembly 46 First part 48 Second part (Venturi part)
50 Third part (exit part)
52 First exhaust port 54 Second exhaust port 56 Exhaust check valve 58 Nozzle member

Claims (20)

In the cooling system for fastening drive tools,
The fastener driving tool includes a cylinder having a longitudinal center axis, a piston movably disposed in the cylinder, and a drive for ejecting the fastener from the fastener driving tool fixed to the piston. A blade and a chamber connected to the cylinder and having a longitudinal central axis, wherein force and heat are repeatedly generated in the chamber, and the force and heat are moved so that the piston moves in the cylinder. Acts on the piston, so that the drive blade can drive a fastener from the fastener drive tool,
Cooling means attached to portions of the chamber and cylinder for cooling the chamber and cylinder;
Housing means for enclosing the cooling means provided in the chamber and the outer wall portion of the cylinder of the fastening drive tool, the inner surface of the housing and the cooling means provided in the chamber and the outer wall portion of the cylinder; Housing means for defining a space between,
Formed in the housing means, communicated with a space between the inner surface of the housing and the cooling means provided in the outer wall portion of the chamber and the cylinder, and provided in the inner surface of the housing and the outer wall portion of the chamber and the cylinder. Cooling air inlet means occupying the flow of cooling air into the space between the cooling means if possible,
A space between an inner surface of the housing and the cooling means provided in the chamber and an outer wall portion of the cylinder, and an air outlet means communicating with the cylinder, during a driving stroke of the piston of the fastener driving tool When the piston moves in the cylinder, cooling outside air is attracted to flow into the cooling air inlet means, and between the inner surface of the housing and the cooling means provided in the chamber and the outer wall portion of the cylinder. And an air outlet means for allowing the cooling means provided in the chamber and the outer wall portion of the cylinder to pass therethrough.   The cooling system according to claim 1, wherein the cooling means provided in the chamber and the outer wall portion of the cylinder includes a cooling fin structure.   3. The cooling fin structure extends radially outward from an outer wall portion of the chamber and the cylinder substantially perpendicular to a longitudinal central axis of the chamber and the cylinder. Cooling system.   The cooling system according to claim 2, wherein the cooling fin structure is disposed so as to overlap in a circumferential direction, and effectively reduces a radius and a diameter dimension of the fastener driving tool.   The cooling system of claim 1 wherein the outlet means comprises a jet pump assembly.   The jet pump assembly includes a venturi section, and the exhaust gas passing from the cylinder through the venturi section of the jet pump assembly has a reduced pressure and an increased flow velocity, whereby the cooled outside air is 6. A cooling system according to claim 5, wherein the cooling system is drawn into the housing means from cooling air inlet means.   The air outlet means communicates with the space and the cylinder formed between the inner surface of the housing means and the cooling means provided in the chamber and the outer wall portion of the cylinder, and the fastener driving tool When the piston moves in the cylinder while the piston is in the return stroke, the cooling outside air is provided on the inner surface of the cooling air inlet means and the housing means, and the cooling means provided on the outer wall portion of the chamber and the cylinder. And being cooled by the cooling means provided on the inner surface of the housing means and the outer wall portion of the chamber and cylinder, wherein the chamber and the cylinder are cooled. 2. The cooling system according to 1. A fan mounted in the air outlet means;
A drive motor coupled to the fan, the drive motor for driving the fan when the drive motor is activated;
One of the cylinder and the chamber of the fastener driving tool is attached to one outer wall portion of the cylinder and the chamber, detects the temperature level of one of the cylinder and the chamber of the fastener driving tool, and detects one of the detected cylinder and the chamber The cooling system according to claim 1, further comprising a temperature switch for starting the drive motor when the temperature level of the motor exceeds a predetermined high temperature level.   A nozzle member attached to the cylinder for exhausting air from the cylinder and entraining the cooling outside air in the space between the inner surface of the housing and the cooling means provided in the chamber and the outer wall portion of the cylinder is further provided. The cooling system according to claim 1. A plenum chamber that communicates with the nozzle member and stores air exhausted from the cylinder;
Control valve means for controlling the amount of air discharged from the plenum chamber in association with the plenum chamber, the control valve means communicating with the nozzle member, the inner surface of the housing, the chamber and the chamber 10. The cooling system according to claim 9, further comprising control valve means for controlling entrainment of the cooled outside air into the space between the cooling means provided on the outer wall portion of the cylinder. For fastening drive tools,
A cylinder having a longitudinal central axis;
A piston movably disposed in the cylinder;
A drive blade fixed to the piston for driving a fastener from the fastener drive tool;
A chamber connected to the cylinder and having a longitudinal central axis, wherein force and heat are repeatedly generated in the chamber, and the force and heat are applied to the piston so that the piston moves in the cylinder. A chamber that allows the drive blade to drive a fastener from the fastener drive tool;
Housing means for enclosing the chamber and the cylinder of the fastening drive tool, the housing means defining a space between an inner surface of the housing and the chamber and an outer wall portion of the cylinder;
Cooling air to the space between the inner surface of the housing and the outer wall portion of the chamber and the cylinder, and to the space between the inner surface of the housing and the cooling means provided in the outer wall portion of the chamber and the cylinder Cooling air inlet means to allow inflow,
A space between an inner surface of the housing and the chamber and an outer wall portion of the cylinder, and an air outlet means communicating with the cylinder, wherein the piston is inserted into the cylinder during a driving stroke of the piston of the fastener driving tool. The air is drawn into the cooling air inlet means, into the space between the inner surface of the housing and the outer wall portion of the chamber and the cylinder, and A fastener driving tool comprising air outlet means for passing the outer wall portion and cooling the chamber and the cylinder.   The fastener driving tool according to claim 11, wherein the cooling means includes a cooling fin structure provided on an outer wall portion of the chamber and the cylinder.   13. The cooling fin structure extends radially outward from an outer wall portion of the chamber and the cylinder substantially perpendicular to a longitudinal central axis of the chamber and the cylinder. Fastener drive tool.   The fastener driving tool according to claim 12, wherein the cooling fin structure is arranged so as to overlap in the circumferential direction, and effectively reduces the radius and the diameter dimension of the fastener driving tool.   12. A fastener driving tool according to claim 11, wherein the outlet means comprises a jet pump assembly.   The jet pump assembly includes a venturi section, and the exhaust gas passing from the cylinder through the venturi section of the jet pump assembly has a reduced pressure and an increased flow velocity, whereby the cooled outside air is 16. A fastener driving tool according to claim 15 adapted to be attracted from cooling air inlet means into the housing means.   The air outlet means communicates with the space and the cylinder formed between the inner surface of the housing means and the cooling means provided in the chamber and the outer wall portion of the cylinder, and the fastener driving tool When the piston moves in the cylinder while the piston is in the return stroke, the cooling outside air is provided on the inner surface of the cooling air inlet means and the housing means, and the cooling means provided on the outer wall portion of the chamber and the cylinder. And being cooled by the cooling means provided on the inner surface of the housing means and the outer wall portion of the chamber and cylinder, wherein the chamber and the cylinder are cooled. The fastener driving tool according to 11. A fan mounted in the air outlet means;
A drive motor coupled to the fan, the drive motor for driving the fan when the drive motor is activated;
One of the cylinder and the chamber of the fastener driving tool is attached to one outer wall portion of the cylinder and the chamber, detects the temperature level of one of the cylinder and the chamber of the fastener driving tool, and detects one of the detected cylinder and the chamber The fastener driving tool according to claim 11, further comprising a temperature switch for starting the drive motor when the temperature level of the motor exceeds a predetermined high temperature level.   A nozzle member attached to the cylinder for exhausting air from the cylinder and entraining the cooling outside air in the space between the inner surface of the housing and the cooling means provided in the chamber and the outer wall portion of the cylinder is further provided. The fastener driving tool according to claim 11. A plenum chamber that communicates with the nozzle member and stores air exhausted from the cylinder;
Control valve means for controlling the amount of air discharged from the plenum chamber in association with the plenum chamber, the control valve means communicating with the nozzle member, the inner surface of the housing, the chamber and the chamber 20. The fastener driving tool according to claim 19, further comprising control valve means for controlling entrainment of the cooled outside air into the space between the cooling means provided on the outer wall portion of the cylinder.

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