초록 ▼

A fastener applying tool driven by air in a driving stroke and a return stroke featuring noise and recoil reduction and increased efficiency, driving force, and speed of operation. Air directed into the main cylinder to force the main piston through its driving stroke is stored in a chamber to rapid

A fastener applying tool driven by air in a driving stroke and a return stroke featuring noise and recoil reduction and increased efficiency, driving force, and speed of operation. Air directed into the main cylinder to force the main piston through its driving stroke is stored in a chamber to rapidly return the main piston. Air compressed by the main piston at one end of the main cylinder is used to form an air cushion to keep the main piston from striking the bottom of the cylinder. The main piston cycles within a slidably mounted main cylinder. Pressurization of one end of the main cylinder during the driving stroke repositions the main cylinder to close the main valve to shut off high pressure air from the main piston and open a valve to vent the air above the piston to atmosphere. Upward movement of the cylinder and rapid return of the piston significantly reduces the recoil force normally experienced in such a tool. A valve assembly coaxially located at the opposite end of the main cylinder functions to admit and exhaust air to pressurize and vents the piston and main cylinder respectively. Noise suppression is achieved by an elastomeric cap. Rapid acting components reduce air wastage and improve overall tool efficiency.

대표청구항 ▼

A pneumatic fastener applying tool, comprising: a housing adapted to contain a supply of air under pressure; a main cylinder in said housing having open and closed ends; a main piston slidably disposed in said main cylinder and having a fastener driver secured to one side thereof which extends out t

A pneumatic fastener applying tool, comprising: a housing adapted to contain a supply of air under pressure; a main cylinder in said housing having open and closed ends; a main piston slidably disposed in said main cylinder and having a fastener driver secured to one side thereof which extends out through the closed end of said main cylinder; means for feeding a fastener into position to be driven by said driver; valve means, cooperating with the open end of said main cylinder, for controlling the flow of air into and out of said main cylinder to move the main piston through its driving and return stroke; a sealed chamber defined by said tool adjacent the closed end of said main cylinder; valve means, disposed above the closed end of the main cylinder for controlling the flow of high-pressure air into said sealed chamber, and valve means, adjacent the closed end of the main cylinder for admitting air into the main cylinder below said main piston whereby air will be trapped in the main cylinder below the main piston which will be compressed by the main piston to form a cushion preventing contact between the main piston and the bottom of the main cylinder and air will be introduced into the closed end of the main cylinder from the sealed chamber when the air above the main piston has been exhausted to return the main piston into its driving position.