1. A muffler comprising:
a casing comprising a gas inlet chamber communicating with a gas inlet and a gas outlet chamber communicating with a gas outlet;
a pressure sensor member, and
a throttling device located between the inlet and outlet of the muffler and coupled to the casing to define the gas inlet chamber and the gas outlet chamber; and controlled by pressure of the gas flow, wherein a cross sectional area of the gas flow of the throttling device reduces when pressure of the gas flow increases, the throttling device comprising an open-and-close member and a partition having an aperture defined therein, wherein the open-and-close member is coupled to the pressure sensor member and cooperates with the aperture of the partition.
2. The muffler according to claim 1, wherein the throttling device controlled by pressure of the gas flow is a pressure reducing valves structure.
3. The muffler according to claim 2, wherein the pressure reducing valves structure comprises an adjusting device and a throttling member.
4. The muffler according to claim 3, wherein the adjusting device comprises a manual adjusting device, a spring, the pressure sensor member and a connection lever which are connected in series.
5. The muffler according to claim 1, wherein the throttling device comprises an open-and-close member and a fixture.
6. The muffler according to claim 1, wherein the throttling device comprises an open-and-close member and a fixture; and wherein the structure of the open-and-close member is characterized in that a cross sectional area of its first surface subjecting to gas pressure from the gas inlet is larger than a cross sectional area of its second surface that is positioned opposite to the first surface and positioned within the gas outlet chamber.
7. The muffler according to claim 4, wherein the throttling member comprises an open-and-close member and a fixture; and wherein the structure of the open-and-close member is characterized in that a cross sectional area of its first surface subjecting to gas pressure from the gas inlet is larger than a cross sectional area of its second surface that is positioned opposite to the first surface and positioned within the gas outlet chamber.
8. The muffler according to claim 4, wherein the pressure sensor member is a diaphragm, a piston or a bellows.
9. The muffler according to claim 7, wherein the connection lever of the adjusting device is connected with the second surface of the open-and-close member.
10. The muffler according to claim 9, wherein the pressure sensor member is a diaphragm, a piston or a bellows.
11. The muffler according to claim 10, wherein a spring chamber is connected with the gas outlet chamber; wherein the spring and a part of the manual adjusting device are located within the spring chamber; and wherein the spring chamber comprises a balancing hole communicating with the atmosphere.
12. The muffler according to claim 7, wherein gas flow discharged from the gas outlet is continuous, stable and without pulsation.
13. The muffler according to claim 11, wherein gas flow discharged from the gas outlet is continuous, stable and without pulsation.
14. The muffler according to claim 1, wherein the pressure sensor member is coupled to the gas outlet chamber and the throttling device being controlled by the pressure of the muffled gas flow.
15. The muffler according to claim 1, wherein the pressure sensor member is a diaphragm, a piston or a bellows and coupled to the casing.
16. The muffler according to claim 14, wherein the pressure sensor member is a diaphragm, a piston or a bellows and coupled to the casing.
17. The muffler according to claim 1, wherein the muffler comprises a spring which is connected with the combination of the pressure sensor and the throttling device.
18. The muffler according to claim 14, wherein the muffler comprises a spring which is connected with the combination of the pressure sensor member and the throttling device.
19. The muffler according to claim 15, wherein the muffler comprises a spring which is connected with the combination of the pressure sensor member and the throttling device.
20. The muffler according to claim 16, wherein the muffler comprises a spring which is connected with the combination of the pressure sensor member and the throttling device.
21. The muffler according to claim 17, wherein the spring is connected with the pressure sensor.
22. The muffler according to claim 17, wherein the other end of the spring is connected with the casing.
23. The muffler according to claim 21, wherein the other end of the spring is connected with the casing.
24. The muffler according to claim 22, wherein a manual adjusting device connects other end of the spring and the casing.
25. The muffler according to claim 22, wherein the part of casing which is connecting the spring form a spring chamber.
26. The muffler according to claim 24, wherein the part of casing which is connecting the spring form a spring chamber.
27. The muffler according to claim 25, wherein the spring chamber comprises a balancing hole communicating with the atmosphere.
28. The muffler according to claim 1, the open-and-close member having a connection lever coupled thereto, wherein the open-and-close member is coupled to the pressure sensor member using the connection lever.
29. The muffler according to claim 28, further comprising a fixture coupled to the partition and positioned adjacent the aperture.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. In a fastener-driving tool with a magazine, a nosepiece and a driver blade slidably reciprocating relative to the nosepiece for driving fasteners, a mechanism for preventing jamming, comprising:
a follower slidably disposed inside the magazine for urging fasteners toward the nosepiece, and having a formation for engaging the driver blade and preventing driver blade reciprocation after a last fastener in the magazine has been driven;
wherein said second portion laterally expands past respective sides of the first portion for guiding said follower in the magazine, said second portion forms a widest part of said follower when viewed from a front of the tool where the magazine abuts the nosepiece.
2. The mechanism of claim 1 wherein the nosepiece includes a shear block defining a fastener passage slot, and said follower is constructed and arranged to enter the slot after the last fastener is driven.
3. The mechanism of claim 2 wherein said nosepiece defines a driver blade path, and a leading edge of said follower extends into said path after the last fastener is driven.
4. The mechanism of claim 1 wherein said follower includes a first portion for engaging a fastener strip, and a second portion for engaging the driver blade.
5. (canceled)
6. The mechanism of claim 4 wherein said follower is generally \u201cT\u201d shaped when viewed from the front.
7. The mechanism of claim 4 wherein said driver blade has a lower end, and in a pre-firing position, once the last fastener is driven, said follower extends into said nosepiece and said second portion is disposed in close proximity to said lower end.
8. The mechanism of claim 7, wherein after the last fastener is driven, said lower end of said driver blade is approximately 0.025 to 0.1 inch from said second portion.
9. The mechanism of claim 4, wherein said shear block has an upper edge, and wherein said second portion slidingly engages said upper edge for supporting said second portion against movement of said driver blade.
10. A fastener-driving tool, comprising:
a magazine having a first end for receiving fasteners, a second end for delivering fasteners for driving, and a guide channel;
a nosepiece defining a fastener passage slot in communication with said magazine for receiving fasteners from said second end and a driver blade path in communication with said slot;
a driver blade slidably reciprocating in said driver blade path for driving fasteners; and
a follower slidably disposed inside said magazine and having a first portion for urging fasteners toward said nosepiece and a second portion for engaging said driver blade and preventing driver blade reciprocation after the last fastener in a fastener strip has been driven;
wherein said second portion is displaced in a range of 0.025 to 0.10 inch from a lower end of said driver blade after the last fastener has been driven for reducing impact to said follower in the event said tool is fired after the last fastener in the fastener strip has been driven.
11. The tool of claim 10 wherein said second portion is slidably engaged in said guide channel, and has a front edge extending beyond a leading edge of said first portion.
12. The tool of claim 10 wherein said nosepiece includes a shear block with an upper edge, and said second portion slidably engages said upper edge for supporting said second portion against movement of said driver blade.
13. The tool of claim 10 wherein said first portion of said follower is aligned with said slot in said nosepiece and extends into said driver blade path after the last fastener has been driven.
14. (canceled)
15. The tool of claim 10 wherein said second portion is supported in said guide channel and receives a lower end of said driver blade for preventing further linear reciprocation after the last fastener has been driven.
16. A fastener-driving tool, comprising:
a magazine having a first end for receiving fasteners, a second end for delivering fasteners for driving, and a guide channel;
a nosepiece defining a fastener passage slot in communication with said magazine for receiving fasteners from said second end and a driver blade path in communication with said slot;
a driver blade slidably reciprocating in said driver blade path for driving fasteners;
a follower slidably disposed inside said magazine and having a first portion for urging fasteners toward said nosepiece and a second portion for engaging said driver blade and preventing driver blade reciprocation after the last fastener in a fastener strip has been driven;
said driver blade has a lower end, and in a pre-firing position, once the last fastener is driven, said follower extends into said nosepiece and said second portion is disposed in close proximity to said lower end; and
said shear block has an upper edge, and wherein said second portion slidingly engages said upper edge for supporting said second portion against movement of said driver blade for reducing impact to said follower in the event said tool is fired after the last fastener in the fastener strip has been driven.
17. The tool of claim 16, wherein after the last fastener is driven, said lower end of said driver blade is approximately 0.025 to 0.1 inch from said second portion.