Compressed air rivet setting tool

Claim 2

A compressed air-powered blind rivet setting tool comprising a. a housing; b. a piston within the housing for movement by compressed air; c. a piston rod connected to the piston and supported for reciprocating movement along a straight line within the housing; d. rivet pulling means reciprocally mounted in said housing and spaced from the piston rod; e. a pivotable lever member pivoted about a pivot axle on the housing, said lever member having a first cam surface at one end portion which surface is slidably engageable on the pulling means and having a second cam surface at the other end portion slidably engageable with the piston rod so that as the piston rod is moved a distance by the compressed air the rivet pulling means is moved a fraction of that distance, said lever member cam surfaces being shaped so that as the member pivots about the axle the distances between the axle and the lines of contact between the cam surfaces on the one hand and the pulling means and piston rod on the other hand remain constant; and f. compressed air control means including valve means which direct compressed air to cause movement of the piston in one direction for actuating the rivet pulling means and cause movement of the piston in the other direction to return the piston, said compressed air control means includes a sleeve having an internal wall, a valve member slidable a selected distance within the sleeve between two limits each limit being defined by the engagement of a seal ring carried by the valve member against seat surfaces of the sleeve in abutting air tight engagement, said seat surfaces being formed in recesses in the internal sleeve wall.

Claim 3

The tool of claim 1 in which said sleeve has first and second opening means formed through the wall thereof, said first opening means for permitting fluid to pass therethrough to the valve member and to one side of the piston whenever said valve member is in one of said two limit positions, said second opening means permitting fluid communication between the other side of the piston and the atmosphere whenever in the other of said two limit positions, and said valve member is formed with a central passage therethrough for fluidically communicating with said first opening means whenever in said other of said two limit positions.

Claim 4

The tool of claim 2 in which said second opening means comprises a pair of separate and spaced apart openings formed in the internal wall of said sleeve, each on opposite sides of one of said seat surfaces.

Claim 5

A compressed air-powered blind rivet setting tool comprising a. a housing; b. a piston within the housing for movement by compressed air; c. a piston rod connected to the piston and supported for reciprocating movement along a straight line within the housing; d. rivet pulling means reciprocally mounted in said housing and spaced from the piston rod; e. a pivotable lever member pivoted about a pivot axle on the housing, said lever member having a first cam surface at one end portion which surface is slidably engageable on the pulling means and having a second cam surface at the other end portion slidably engageable with the piston rod so that as the piston rod is moved a distance by the compressed air the rivet pulling means is moved a fraction of that distance, said lever member cam surfaces being shaped so that as the member pivots about the axle the distances between the axle and the lines of contact between the cam surfaces on the one hand and the pulling means and piston rod on the other hand remain constant; and f. compressed air control means including valve means which direct compressed air to cause movement of the piston in one direction for actuating the rivet pulling means and cause movement of the piston in the other direction to return the piston said compressed air control means includes a sleeve having an internal wall, a valve member slidable a selected distance within the sleeve between two limits each limit being defined by the engagement of a seal ring carried by the valve member against seat surfaces of the sleeve in abutting air tight engagement, said seat surfaces being formed in recesses in the internal sleeve wall, said sleeve has first and second opening means formed through the wall thereof, said first opening means for permitting fluid to pass therethrough to the valve member and to one side of the piston whenever said valve member is in one of said two limit positions, said second opening means permitting fluid communication between the other side of the piston and the atmosphere whenever in the other of said two limit positions, and said valve member is formed with a central passage therethrough for fluidically communicating with said first opening means whenever in said other of said two limit positions, said second opening means comprises a pair of separate and spaced apart openings formed in the internal wall of said sleeve, each on opposite sides of one of said seat surfaces, whereby one of said openings communicates with atmosphere and said other opening communicates with the other side of the piston.

Claim 6

A compressed air-powered blind rivet setting tool comprising a. a housing; b. a piston within the housing for movement by compressed air; c. a piston rod connected to the piston and supported for reciprocating movement along a straight line within the housing; d. rivet pulling means reciprocally mounted in said housing and spaced from the piston rod; e. a pivotable lever member pivoted about a pivot axle on the housing, said lever member having a first cam surface at one end portion which surface is slidably engageable on the pulling means and having a second cam surface at the other end portion slidably engageable with the piston rod so that as the piston rod is moved a distance by the compressed air the rivet pulling means is moved a fraction of that distance, said lever member cam surfaces being shaped so that as the member pivots about the axle the distances between the axle and the lines of contact between the cam surfaces on the one hand and the pulling means and piston rod on the other hand remain constant; and f. compressed air control means including valve means which direct compressed air to cause movement of the piston in one direction for actuating the rivet pulling means and cause movement of the piston in the other direction to return the piston said compressed air control means includes a sleeve having an internal wall, a valve member slidable a selected distance within the sleeve between two limits each limit being defined by the engagement of a seal ring carried by the valve member against seat surfaces of the sleeve in abutting air tight engagement, said seat surfaces being formed in recesses in the internal sleeve wall, said sleeve has first and second opening means formed through the wall thereof, said first opening means for permitting fluid to pass therethrough to the valve member and to one side of the piston whenever said valve member is in one of said two limit positions, said second opening means permitting fluid communication between the other side of the piston and the atmosphere whenever in the other of said two limit positions, and said valve member is formed with a central passage therethrough for fluidically communicating with said first opening means whenever in said other of said two limit positions, said second opening means comprises a pair of separate and spaced apart openings formed in the internal wall of said sleeve, each on opposite sides of one of said seat surfaces, whereby one of said openings communicates with atmosphere and said other opening communicates with the other side of the piston.