A pneumatic tool (20) for impacting a workpiece ( 22) is provided. The tool (20) comprises a casing (42) defining a chamber (48). A piston (54) is slidable within the chamber (48) along an operational axis (A). An exhaust valve (100), controlled by a pilot valve (200), slides the piston (54) by sele
A pneumatic tool (20) for impacting a workpiece ( 22) is provided. The tool (20) comprises a casing (42) defining a chamber (48). A piston (54) is slidable within the chamber (48) along an operational axis (A). An exhaust valve (100), controlled by a pilot valve (200), slides the piston (54) by selectively introducing and releasing pressurized fluid into and out from the chamber (48). A tool bit (24) is slidable within the chamber (48) to impact the workpiece (22 ). Kinetic energy is transferred to the tool bit (24) from the piston (54) via an impact from the piston (54) as the piston (54) slides within the chamber (48). A shock absorbing valve (500) includes a floating collar (502) that is slidable along the casing (42) between two seal rings ( 504). A handle (34) is mounted to the floating collar ( 502). The floating collar (502) reciprocates along the casing (42) as fluid envelopes (506, 508) are exposed to atmosphere in an alternating manner through exhaust ports (530, 532 ) in the floating collar (502) to reduce pressure in the fluid envelopes (506, 508) thereby reducing shock to a user grasping the handle (34).
대표청구항▼
What is claimed is: 1. A tool (20) for impacting a workpiece (22), comprising; a casing (42) having a proximal end (44) and a distal end (46) and defining a chamber (48) therebetween, an impactor device (24, 54) slidable within said chamber (48) to impact the workpiece, and a shock absorbing valve
What is claimed is: 1. A tool (20) for impacting a workpiece (22), comprising; a casing (42) having a proximal end (44) and a distal end (46) and defining a chamber (48) therebetween, an impactor device (24, 54) slidable within said chamber (48) to impact the workpiece, and a shock absorbing valve (500) including a floating collar (502) slidably coupled to said casing (42) to define first (506) and second (508) fluid envelopes between said floating collar (502) and said casing (42) for receiving pressurized fluid, said floating collar (502) defining at least one first exhaust port (530) in selective fluid communication with said first fluid envelope (506) and at least one second exhaust port (532) in selective fluid communication with said second fluid envelope (508) whereby said exhaust ports (530, 532) alternate in reducing pressure in said fluid envelopes (506, 508) as said floating collar (502) slides along said casing (42) to reduce shock to a user of said tool (20) while said impactor device (24, 54) impacts the workpiece. 2. A tool as set forth in claim 1 wherein said floating collar (502) is slidable along said casing (42) between a first position in which said at least one first exhaust port (530) is in fluid communication with said first fluid envelope (506) to expose said first fluid envelope (506) to atmosphere and said at least one second exhaust port (532) is closed from fluid communication with said second fluid envelope (508) and a second position in which said at least one first exhaust port (530) is closed from fluid communication with said first fluid envelope (506 ) and said at least one second exhaust port (532) is in fluid communication with said second fluid envelope (508) to expose said second fluid envelope (508) to atmosphere whereby alternating exposure of said fluid envelopes (506, 508) to atmosphere increases a pressure differential between said fluid envelopes (506 , 508) thereby urging said floating collar (502) to an equilibrium position. 3. A tool as set forth in claim 1 wherein said floating collar (502) further defines a passage (518) in fluid communication with said fluid envelopes (506, 508) with a pressure regulator (520) disposed in said passage (518) for regulating flow of pressurized fluid into said fluid envelopes (506 , 508). 4. A tool as set forth in claim 3 wherein said pressure regulator (520) is adjustable for tuning said tool (20) to multiple pressure rates. 5. A tool as set forth in claim 4 wherein said pressure regulator (520) comprises a cylindrical body formed from acetal. 6. A tool as set forth in claim 1 wherein said at least one first exhaust port (530) is further defined as a plurality of first exhaust ports (530) and said at least one second exhaust port (532) is further defined as a plurality of second exhaust ports (532). 7. A tool as set forth in claim 1 including a first seal ring (504) fixed to said casing (42) and a second seal ring seal (504) fixed to said casing (42) and spaced from said first seal ring (504) wherein said floating collar (502) is slidably coupled to said casing (42) about said seal rings ( 504) and said annular envelopes (506, 508) are defined between said floating collar (502), said seal rings (504), and said casing (42). 8. A tool as set forth in claim 1 including a valve system (100, 200) for selectively introducing and releasing pressurized fluid into and out from said chamber (48) to slide said impactor device (24, 54) within said chamber (48 ) along said operational axis (A). 9. A tool as set forth in claim 8 further including an energy absorbing mechanism (402) having a sleeve (404) slidable along said distal end (46) of said casing (42) to define a first pressure chamber (412) with said impactor device (24, 54) for reducing the kinetic energy of said impactor device ( 24, 54) in a first stage immediately after movement thereof by compressing pressurized fluid within said first pressure chamber ( 412). 10. A tool as set forth in claim 9 wherein said energy absorbing mechanism (402) further comprises a second pressure chamber (414) defined between said casing (42) and said sleeve (404) for reducing the kinetic energy of said impactor device (24, 54) in a second stage by compressing pressurized fluid within said second pressure chamber (414) after compressing the pressurized fluid in said first pressure chamber ( 412) when said impactor device (24, 54) impacts said sleeve (404). 11. A tool as set forth in claim 8 wherein said valve system (100, 200) comprises an exhaust valve (100) having a valve housing (102) concentrically surrounding said casing ( 42) and a sliding sleeve (108) for sliding between said casing (42) and said valve housing (102) to expose ports ( 110) defined annularly about said casing (42) and release pressurized fluid within said chamber (48) to atmosphere. 12. A tool as set forth in claim 11 wherein said valve system (100, 200) further comprises a pilot valve (200) having a valve housing (202) and a plunger (206) slidable within said valve housing (202) for selectively introducing pressurized fluid into and out from said chamber (48) by controlling said exhaust valve (100). 13. A tool as set forth in claim 1 including a handle ( 34) mounted to said floating collar (502) for grasping by the user. 14. A shock absorbing valve (500) for a tool (20 ) having a casing (42) defining a chamber (42) and an impactor device (24, 54) slidable within the chamber ( 48) to impact a workpiece (22), said valve comprising; a floating collar (502) for slidably coupling to said casing (42) to define first (506) and second (508) fluid envelopes between said floating collar (502) and the casing (42) for receiving pressurized fluid, said floating collar (502) defining at least one first exhaust port (530) in selective fluid communication with the first (506) fluid envelope and at least one second exhaust port ( 532) in selective fluid communication with the second (508) fluid envelope whereby said exhaust ports (530, 532) alternate in reducing pressure in the fluid envelopes (506, 508) as said floating collar (502) slides along the casing ( 42) to reduce shock to a user of the tool (20) while the impactor device (24, 54) impacts the workpiece. 15. A tool as set forth in claim 14 wherein said floating collar (502) is adapted for sliding along said casing (42) between a first position in which said at least one first exhaust port (530) is in fluid communication with the first fluid envelope ( 506) to expose the first fluid envelope (506) to atmosphere and said at least one second exhaust port (532) is closed from fluid communication with the second fluid envelope (508) and a second position in which said at least one first exhaust port (530) is closed from fluid communication with the first fluid envelope ( 506) and said at least one second exhaust port (532) is in fluid communication with the second fluid envelope (508) to expose the second fluid envelope (508) to atmosphere whereby alternating exposure of the fluid envelopes (506, 508) to atmosphere increases a pressure differential between the fluid envelopes (506, 508) thereby urging said floating collar (502) to an equilibrium position. 16. A valve as set forth in claim 15 wherein said floating collar (502) further defines a passage (518) for being in fluid communication with the fluid envelopes (506, 508) with a pressure regulator (520) disposed in said passage ( 518) for regulating flow of pressurized fluid into the fluid envelopes (506, 508). 17. A valve as set forth in claim 16 wherein said pressure regulator (520) is adjustable. 18. A valve as set forth in claim 16 wherein said pressure regulator (520) comprises a cylindrical body formed from acetal. 19. A valve as set forth in claim 14 wherein said at least one first exhaust port (530) is further defined as a plurality of first exhaust ports (530) and said at least one second exhaust port (532) is further defined as a plurality of second exhaust ports (532). 20. A valve as set forth in claim 14 including a first seal ring (504) for fixing to the casing (42) and a second seal ring seal (504) for fixing to the casing (42) at a position spaced from said first seal ring (504) wherein said floating collar (502) is adapted for slidably coupling to said casing ( 42) about said seal rings (504) such that the annular envelopes (506, 508) are defined between said floating collar (502), said seal rings (504), and the casing ( 42). 21. A valve as set forth in claim 14 including a handle ( 34) mounted to said floating collar (502) for grasping by the user.
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이 특허에 인용된 특허 (34)
Ranck Gerald L. (2439 Old Philadelphia Pike Lancaster PA 17602), Air hammer.
Krasnoff Eugene L. (107 Kingsway Commons Princeton NJ 08540), For percussive tools, a housing, a pneumatic distributor, and a hammer piston means therefor.
Pressley Jack (Hudson OH) Knott John (New Hartford NY) Young David M. (Frankfort NY) Paul Pradip K. (Whitesboro NY) Wilusz Richard (Utica NY), Vibration-reduced pneumatic tool.
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