초록 ▼

A stapler wherein the piston which drives home discrete fasteners is received in a cylinder having an open end overlapped by the valving element of a main valve. The valving element is permanently biased to sealing position by a plastic diaphragm spring and is normally held in such position by press

A stapler wherein the piston which drives home discrete fasteners is received in a cylinder having an open end overlapped by the valving element of a main valve. The valving element is permanently biased to sealing position by a plastic diaphragm spring and is normally held in such position by pressurized gaseous fluid which is supplied by way of a passage containing a second valve and a reciprocable second valving element close to a chamber at the outer side of the valving element of the main valve. The second valve seals the passage from a source of pressurized fluid and simultaneously establishes communication between the passage and the atmosphere in response to depression of a trigger. This results in a reduction of pressure in the passage whereby the pressurized fluid in the chamber shifts the second valving element to a position in which the chamber is free to communicate with the atmosphere at a location close to the chamber. This enables pressurized fluid to lift the valving element of the first valve and to abruptly propel the piston in a direction to drive a fastener into one or more objects.

대표청구항 ▼

A pneumatic implement for driving staples, nails and analogous fasteners, comprising a housing: a cylinder provided in said housing and having an open first end and a second end; a piston reciprocable in said cylinder and having means for driving a fastener in response to movement of the piston from

A pneumatic implement for driving staples, nails and analogous fasteners, comprising a housing: a cylinder provided in said housing and having an open first end and a second end; a piston reciprocable in said cylinder and having means for driving a fastener in response to movement of the piston from said first toward said second end; a valve including a valving element adjacent said first end and movable in said housing between operative and inoperative positions in which said first end is respectively sealed and exposed, and means for biasing said element to said operative position, said biasing means comprising a ring-shaped spring and at least a portion of said spring consisting of polyurethane; a source of pressurized gaseous fluid, said element having a first surface which is acted upon by fluid to move said element to said inoperative position with attendant penetration of fluid into said cylinder and propulsion of said piston toward said second end, said element further having a second surface substantially opposite said first surface and said housing having a chamber adjacent said second surface; means for connecting said source to said chamber so that the fluid in said chamber assists said biasing means to maintain said element in said operative position; and means for establishing communication between said chamber and the atmosphere adjacent said chamber to thus reduce the pressure in said chamber and enable the fluid acting upon said first surface to move said element to said inoperative position.