Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D51/00—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends
  • B23D51/16—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends of drives or feed mechanisms for straight tools, e.g. saw blades, or bows
  • B23D51/18—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends of drives or feed mechanisms for straight tools, e.g. saw blades, or bows actuated by fluid or gas pressure

Definitions

• the present invention relates to a pneumatic reciprocating tool such as a hand-held saw that is driven by compressed air.
• This type of pneumatic reciprocating tool includes, for example, a cylindrical housing, first and second pistons provided in the housing so as to be displaceable in the axial direction of the housing, and a second piston.
• Force A tool mounting member that extends forward and attaches a tool such as a saw at the front end, compressed air supply passage means that communicates a compressed air source between the first and second pistons, and the first and second pistons respectively forward And first and second panels that urge toward the rear, and supply compressed air from the compressed air source between the first and second pistons to supply the first and second pistons.
• the fixture mounting member is driven forward by staking them to the first and second panels and displacing them backward and forward, respectively.
• the present invention provides a pneumatic system that can properly brake and stop the second piston to mitigate the impact force even when the compressed air for driving becomes high pressure.
• the purpose is to provide a reciprocating tool.
• the present invention provides: A tubular housing;
• a first piston provided in the housing so as to be displaceable in an axial direction of the housing;
• a second piston provided in the housing, aligned with the first piston in the axial direction, and displaceable in the axial direction;
• a tool mounting member that extends forward of the second piston force and attaches a tool such as a saw to the front end; and a compressed air passage means that supplies a compressed air source between the first and second pistons, and Pneumatic pressure that drives the tool mounting member forward by supplying compressed air from the compressed air source between the second pistons and displacing the first and second pistons backward and forward, respectively.
• Type reciprocating tool
• a braking member provided in the housing at a front position of the second piston comprising a piston braking chamber having an opening facing rearward, and the second piston being driven and displaced forward by a predetermined distance by compressed air
• Atmospheric communication means for communicating the space between the first and second pistons to the atmosphere when the second piston enters the piston braking chamber
• a pneumatic reciprocating tool is provided.
• the brake member is connected to the first piston so as to be displaced integrally with the first piston, and a panel for urging the first piston forward in the axial direction is provided. It can. That is, by doing so, the first piston and the braking member are positioned by the first biasing force in the axial direction when compressed air is not supplied between the first and second pistons, and the first When compressed air is supplied between the second piston and the second piston, the braking member is driven backward together with the first piston. Therefore, when the second piston is driven forward by the compressed air, the second piston and the braking member approach each other, and when the second piston enters the piston braking chamber of the braking member, the rearward movement of the braking member is performed.
• the movement, and therefore the backward movement of the first piston is subject to braking. Therefore, it is possible to obtain the impact relaxation of the first piston that can be achieved only by the impact relaxation of the second piston. In addition, the stroke length of the first and second pistons can be shortened.
• the first piston has a rear end wall and a cylindrical wall extending forward from the rear end wall;
• the second piston is slidable in the axial direction within the cylindrical wall of the first piston, and the air communication means is provided so as to pass through the cylindrical wall of the first piston; and An air passage is provided in the housing and communicates with the opening and communicates with the atmosphere.
• the opening of the atmosphere communicating means is opened and closed by sliding the second piston relative to the first piston. You can make it.
• a rear end force of the housing having a fixed shaft extending forward in the housing
• a rear end wall of the first piston has a hole through the fixed shaft, and the first piston is slidable along the fixed shaft;
• the compressed air supply passage means includes a through-hole penetrating the fixed shaft in the axial direction, one end communicated with the rear end of the through-hole, and the other end communicated with the compressed air source. And a passage.
• the pneumatic reciprocating tool further comprises A valve having a first end face communicated between the first and second pistons through the through-hole and a second end face having a smaller area than the first end face, and is compressed to the second end face
• the compressed air introduction passage leading to the rear end portion of the through hole of the fixed shaft is closed, and the second end surface is closed.
• the atmospheric pressure communication means causes the atmospheric pressure between the first and second pistons or the When the pressure is lowered to a close value, the supply of compressed air between the first and second pistons is cut off, and the braking stop of the second piston can be performed efficiently.
• FIG. 1 is a longitudinal sectional view of a compressed pneumatic reciprocating tool according to the present invention, showing a state where it is not actuated.
• FIG. 2 is an enlarged cross-sectional view showing a compressed air supply path of the compressed pneumatic reciprocating tool of FIG.
• FIG. 3 is a view similar to FIG. 1, but showing a state in which the tip of the second piston starts to enter the piston braking chamber of the braking member by operating the compressed pneumatic reciprocating tool.
• FIG. 4 is a view taken along line IV—IV in FIG.
• FIG. 5 is a cross-sectional view taken along line V—V in FIG.
• FIG. 6 is a view similar to FIG. 1, but shows a state in which the compression / pneumatic reciprocating tool is operated and the second piston enters the piston braking chamber of the braking member and braking is stopped.
• Pneumatic reciprocating tool 10 housing 12; first piston 14; second piston 16; tool mounting member 18; supply passage (through hole) 19; fixed shaft 20; braking member 22; piston braking chamber 24; Part 26; Seal ring 27; Rear end wall 28; Cylindrical wall 30; Through hole 32; First coil panel 34; Second coil panel 36; Hose 40; Rear end wall 42; First rear end member 44; 2 Rear end member 46; Packing 45, 47; Horizontal passage 48; On-off valve 50; Panel setting member 51; Valve setting hole 52; Compression coil panel 53; Reverse L-shaped passage 54; First vertical passage 58; Small diameter horizontal passage 59 ; Large-diameter horizontal passage 60; Second vertical passage 62: Rear end flange portion 64; Horizontal through-hole 66; Spool valve 68; Valve holding member 70; Large-diameter sliding portion 72; Small-diameter sliding portion 74; Large-diameter hole Part 76; Small-diameter hole 78; Passage 79
• a pneumatic reciprocating tool 10 is provided with a cylindrical housing 12 and a displacement in the axial direction of the housing in the housing.
• a cylindrical first piston 14, a second piston 16 provided in the first piston so as to be displaceable in the axial direction, and a tool S such as a saw at the front end extending forward of the second piston force.
• Compressed air supply comprising a tool mounting member 18 to be mounted and a fixed shaft 20 provided with a supply passage 19 extending forward of the rear end force of the housing 12 and supplying compressed air between the first and second pistons. Means.
• Compressed air from the compressed air source (not shown) is supplied between the first and second pistons 14 and 16 so that the first and second pistons 14 and 16 are moved backward and forward, respectively. By displacing, the tool mounting member is driven forward! /.
• the pneumatic reciprocating tool 10 further includes a braking member 22 provided in the housing at a position in front of the second piston 16.
• the brake member 22 includes a piston brake chamber 24 having an opening facing rearward, and the opening portion 26 also has a small diameter front portion 26 of the second piston 16 that is displaced forward by a predetermined distance by compressed air.
• the second piston 16 is braked and stopped by the air in the piston braking chamber 24 compressed by the front portion 26.
• the front portion 26 of the second piston 16 is provided with a seal ring 27, and when the front portion 26 enters the piston braking chamber 24, Chamber 24 is now sealed.
• the first piston 14 has a rear end wall 28 and a cylindrical wall 30 extending forward from the rear end wall.
• the cylindrical wall 30 has a through hole 32 formed therein. As shown in FIG. 3, when the front portion 26 of the second piston 16 enters the piston braking chamber 24 of the braking member 22, as shown in FIG. It is released from the closure by 16, and the space between the first and second pistons 14, 16 is vented to the atmosphere.
• the braking member 22 is screwed to the first piston 14 and is displaced together with the first piston 14 in the axial direction.
• the first piston 14 is urged forward by a first coil panel 34 set between the rear end portion of the housing 12 and the braking member 22 is set between the front end portion of the housing 12. It is urged backward by the second coil panel 36.
• the compressed air supply means through which the supply path 19 of the fixed shaft 20 is communicated includes a rear end wall 42 of the housing 12 and first and second rear ends attached to the rear end wall 42
• the fluid passage forces formed in the end members 44, 46 are also configured.
• 45 and 47 indicate packings.
• the second rear end member 46 is a valve setting that houses a horizontal passage 48 to which the hose 40 is coupled, and an on-off valve 50 that is provided so as to be orthogonal to the horizontal passage 48 and can be displaced in the vertical direction It has a hole 52 and an inverted L-shaped passage 54 provided near the lower end of the valve setting hole 52.
• the on-off valve 50 is urged to the closed position by a compression coil panel 53 set between it and the panel setting member 51 set in the valve setting hole 52, and is pivotally attached to the second rear end member 46. By pressing the lever 110 clockwise, the lever 110 is driven to the open position.
• the first rear end member 44 includes a first vertical passage 58 that communicates with the inverted L-shaped passage 54, a small-diameter horizontal passage 59 that is connected to the upper end of the vertical passage 58, and a smaller-diameter horizontal passage 59.
• a large-diameter horizontal passage 60 connected to the vertical passage 58 at a lower position and a second vertical passage 62 to be described later are provided.
• FIG. 4 shows a left end view of the first rear end member taken along line IV-IV in FIG.
• the rear end wall 42 of the housing 12 has a horizontal diameter to receive the circular rear end flange portion 64 of the fixed shaft 20 shown in FIG. 5 which is a cross-sectional view taken along line V—V in FIG. It has through holes 66.
• the horizontal through hole has a spool valve 68 and a spool valve in the horizontal direction.
• a valve holding member 70 is set for slidable holding.
• the spool valve 68 has a large-diameter sliding portion 72 and a small-diameter sliding portion 74, and correspondingly, the valve holding member 70 supports the large-diameter sliding portion 72 so as to be slidable.
• a central horizontal through hole 77 having a large diameter hole 76 and a small diameter hole 78 is formed.
• the valve holding member 70 also has an upper horizontal through hole 80 at an upper portion thereof, and the right end of the horizontal through hole 80 is communicated with the small-diameter horizontal passage 59 of the first rear end member 44.
• a circular recess 82 is formed concentrically with the left end opening of the central horizontal through hole 77 and having a diameter larger than that of the left end opening, and the left end of the upper horizontal through hole 80 is It communicates with the circular recess 82.
• the spool valve 68 has first and second recesses 84 and 86 formed in the central portion in the diameter direction thereof, and a radial hole 88 passing through the spool valve in the radial direction from the second recess 86.
• a passage 79 extending to a position communicating with the second vertical passage 62 of the first rear end member 44 is formed on the right side of the small-diameter hole portion 78 of the central horizontal through hole 77 described above.
• the passage 79 is in communication with the radial hole 88.
• the spool valve 68 has a left-facing surface area larger than a right-facing surface area so that the spool valve 68 is moved to the right when the pressure of the compressed air source is applied to both surfaces. It will be driven to the direction.
• the housing 12 is formed with a compressed air communication passage 90 extending in the axial direction along the lower portion as viewed in FIGS. 1 and 2, and the front end of the passage 90 is formed on the inner periphery of the housing 12.
• the second piston 1 passes through a radial through hole 94 formed in a liner 92 provided so that the first piston 14 slides and a radial hole 96 formed in the cylindrical wall 30 of the first piston 14. It communicates with a space 98 between 6 and the braking member 22.
• annular sliding portions 100 and 102 are provided on both sides of the radial hole 96 provided in the cylindrical wall 30 of the first piston 14 and enter from the radial through hole 94 provided in the liner 92. Compressed air is prevented from leaking to both sides.
• the through hole 32 provided in the cylindrical wall of the first piston 14 is formed between the liner 92 and the first piston and extends rearward, and as shown in FIG.
• the exhaust passage 104 extends between the flange portion 64 and the rear end wall 42 of the housing 12 and extends through the first rear end member 44 and communicates with the atmosphere.
• the lever 110 is pushed clockwise as viewed in Fig. 1 to open the on-off valve 50.
• the compressed air from the compressed air source passes through the hose 40, the passages 48, 54 of the second rear end member 46, and the passages 58, 59, 60 of the first rear end member 44. Be put on.
• the left-facing surface of the spool valve 68 has a larger area than the right-facing surface. Therefore, when compressed air acts on these surfaces, the spool valve 68 is biased to the right side, The compressed air is supplied between the first and second pistons 14 and 16 through the through hole 19 of the fixed shaft 20.
• the second piston 16 closes the through-hole 32 formed in the cylindrical wall 30 of the first piston 14, and therefore the compressed air supplied between the first and second pistons. Drives the first and second pistons backward and forward, respectively.
• FIG. 3 shows that the first and second pistons 14, 16 are so driven, and the front end 26 of the second piston 16 begins to enter the right end opening of the piston braking chamber 24 of the braking member 22. The status is shown.
• the second piston 16 opens the through hole 32 formed in the cylindrical wall 30 of the first piston 14, and communicates the space between the first and second pistons 14, 16 to the exhaust passage 104. For this reason, the first piston 14 is stopped by the action of the first coil panel 34 and then moved forward.
• the second piston 16 is inertial and continues to move forward at a greater speed than the braking member integral with the first piston 14, so that the front portion 26 of the second piston further Enters the piston braking chamber 24 and compresses the air in the braking chamber (when the front portion 26 of the second piston enters the piston braking chamber 24, the space between the first and second pistons 14, 16 is atmospheric. Therefore, the spool valve is displaced to the left, and the upper horizontal passage 80 of the valve holding member 70 and the supply passage 19 of the fixed shaft 20 are cut off). The air compressed in the brake chamber 24 exerts a braking action on the second piston 16, and the second piston is finally stopped.
• the compressed air communication passage 90, the radial through hole 94 The second piston 16 is pushed back by the compressed air supplied through the radial hole 96 so that the second piston 16 closes the through hole 32 of the cylindrical wall 30 of the first piston 14 and moves further backward. It continues to move, communicating the space 98 to the through-hole 32 and communicating the space 98 to the atmosphere. At the same time, the volume between the first and second pistons 14 and 16 is reduced, the internal air pressure rises, and the spool valve 68 is moved again to the right to compress air. The compressed air from the air source is supplied between the first and second pistons through the through hole 19 of the fixed shaft 20.
• the compressed air source is supplied to the passage 54 of the second rear end member 46, the passages 58 and 60 of the first rear end member 44, the radial holes 88 of the spool valve 68, and the second Through the recess 86, the passage 79, the passage 62 of the first rear end member 44, and the passage 90 of the housing 12, the space 98 between the second piston 16 and the braking member 22 is always communicated, and therefore piston braking is performed.
• the chamber 24 is filled with compressed air, and a large braking action can be performed on the second piston 16 when the second piston 16 enters the piston braking chamber 24.
• the second piston 16 when the on-off valve 50 is opened, the second piston 16 is in a position as shown in FIG. 3 with respect to the first piston 14, that is, the through-hole 32 in the cylindrical wall 30 of the first piston 14.
• the compressed air is supplied to the space 24 between the second piston 16 and the braking member 22 as described above. Therefore, the second piston 16 is in the state shown in FIG. 1 with respect to the first piston 14 due to the action of the compressed air, and the spool valve 68 is moved to the right.
• the pneumatic reciprocating tool is used for reciprocal movement.
• the braking member 22 is separated from the housing 12 and is fixed to the housing by being integrally formed with a force housing that is adapted to slide within the housing. It is out.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Sawing (AREA)
• Portable Power Tools In General (AREA)
• Actuator (AREA)

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Citations (9)

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• 2006
  • 2006-02-06 JP JP2006029007A patent/JP4564456B2/ja not_active Expired - Fee Related
• 2007
  • 2007-01-30 KR KR1020087019251A patent/KR101008238B1/ko active IP Right Grant
  • 2007-01-30 CN CN2007800044879A patent/CN101378871B/zh active Active
  • 2007-01-30 WO PCT/JP2007/051463 patent/WO2007091448A1/ja active Application Filing
  • 2007-02-05 TW TW096104126A patent/TW200738411A/zh not_active IP Right Cessation

Patent Citations (9)

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