Fastener driving tool

Claim 2

A pneumatically operated automatically cycling fastener driving tool including a housing having a cavity Defining a fluid reservoir, a cylinder in said housing, a piston slidably mounted in the cylinder, main valve means controlling the admission of fluid to and the exhaustion of fluid from said one end of said cylinder in response to the exhaustion of fluid from one surface of said main valve and the admission of fluid against said surface thereto, a return fluid chamber in said housing communicating with said cylinder, valve means for supplying fluid to said return fluid chamber when said piston is near the end of its drive stroke, passage means interconnecting said surface of said main valve means and said return fluid chamber, and control valve means operatively associated with said passage means for selectively opening and closing said passage means.

Claim 3

A fastener driving tool as set forth in claim 1 including a trigger valve assembly connected when released to interconnect said surface of said main valve means and said reservoir, and connected when depressed to interconnect said surface of said main valve means and said return fluid chamber.

Claim 4

A fastener driving tool as set forth in claim 1 including means for throttling the fluid flow between said main valve means and said return fluid chamber thereby regulating the rate of recycling of said tool.

Claim 5

A pneumatically operated fastener driving tool including a housing having a cavity defining a fluid reservoir, a cylinder in said housing, a piston slidably mounted in the cylinder and provided with fluid bypass means for one end of said cylinder to the other end thereof upon a predetermined pressure differential, main valve means controlling the admission of fluid to and the exhaustion of fluid from said one end of said cylinder in response to the exhaustion of fluid from one surface of said main valve means and the admission of fluid to said surface thereto, a return fluid chamber in said housing communicating with said other end of said cylinder, means for exhausting said other end of said cylinder, and trigger control means connecting said surface of said main valve means to said reservoir when released and connecting said surface of said main valve means to said return air chamber when depressed.

Claim 6

A pneumatically operated fastener driving tool including a housing having a cavity defining a fluid reservoir, a cylinder in said housing, a piston slidably mounted in the cylinder and provided with fluid bypass means for one end of said cylinder to the other end thereof upon a predetermined pressure differential, main valve means controlling the admission of fluid to and the exhaustion of fluid from said one end of said cylinder in response to the exhaustion of fluid from one surface of said main valve means and the admission of fluid to said surface thereto, a return fluid chamber in said housing communicating with said other end of said cylinder, means for exhausting said other end of said cylinder, and trigger control means connecting said surface of said main valve means to said reservoir when released and connecting said surface of said main valve means to said return air chamber when depressed.

Claim 7

A fastener driving tool as set forth in claim 4 including means for throttling the fluid flow between said surface of said main valve means and said return fluid chamber thereby regulating the rate of recycling of said tool.

Claim 8

An automatically cycling fastener driving tool comprising: a housing including a cylinder and a reservoir supplied with fluid under pressure; a fastener driving means including a piston slidably mounted in the cylinder; main valve means movable between normal and operated positions to selectively connect the cylinder to the atmosphere and the fluid in the reservoir; operating means connected to the main valve means for controlling movement of the main valve means between its normal and operated positions, said operating means including a fluid pressure control chamber and a fluid pressure responsive means with a fluid pressure responsive surface; a manually controlled valve means having a first passage connected to the control chamber and additional second and third passages said manually controlled valve means having a first position coupling the first and second passages and a second position connecting the first and third passages; first means coupling the second passage to the reservoir so that fluid is applied from the reservoir to said surface when the manually controlled valve means is in its first position; and second means for placing the third passage in communication with the cylinder so that the third passage is alternately connected to pressurized fluid and the atmosphere thereby to connect fluid and the atmosphere to said surface over the first and third passages when the manually controlled valve means is in its second position.

Claim 9

An automatically cycling fastener driving tool comprising: a housing including a cylinder and a reservoir supplied with fluid under pressure; a fastener driving means including a piston slidably mounted in the cylinder; main valve means movable between normal and operated positions to selectively connect the cylinder to the atmosphere and the fluid in the reservoir; operating means connected to the main valve means for controlling movement of the main valve means between its normal and operated positions, said operating means including a fluid pressure control chamber and a fluid pressure responsive means with a fluid pressure responsive surface; a manually controlled valve means having a first passage connected to the control chamber and additional second and third passages said manually controlled valve means having a first position coupling the first and second passages and a second position connecting the first and third passages; first means coupling the second passage to the reservoir so that fluid is applied from the reservoir to said surface when the manually controlled valve means is in its first position; and second means for placing the third passage in communication with the cylinder so that the third passage is alternately connected to pressurized fluid and the atmosphere thereby to connect fluid and the atmosphere to said surface over the first and third passages when the manually controlled valve means is in its second position.

Claim 10

The fastener driviNg tool set forth in claim 6 in which the second means includes an opening communicating with the interior of the cylinder that is selectively connected to the atmosphere or pressurized fluid in dependence on the position of the piston.