Pliers type blind riveting tool

Claim 2

A pliers-type blind riveting tool comprising a handle member supporting a nosepiece engageable with a rivet of a mandrel rivet to be set, a jaw case movable in the handle member to carry cooperative mandrel gripping jaws toward and from the nosepiece, a force transmitting member pivoted to the handle member and operatively connected to the jaw case, and a pulling handle pivoted to the handle member and formed with a cam surface for causing the force transmitting member to pivot on the handle member and thereby, in a rivet-setting stroke, forceably retract the jaw case from the nosepiece with increasing mechanical advantage.

Claim 3

A pliers-type blind riveting tool as in claim 1 wherein said force transmitting member carries at least one roller, and said cam surface is arcuately shaped to bear on said roller, the center of curvature of the cam surface being selected so that the distance between the pivotal connection of the pulling handle and the line of action of the force applied through said surface to the roller decreases during rivet-setting.

Claim 4

A hand tool for feeding mandrel-rivets comprising a pair of handles pivotally connected together, one of said handles carrying at one end a nosepiece adapted to receive a mandrel while abutting its rivet, said one handle slidably supporting a jaw case and mandrel gripping jaws therein in alignment with the nosepiece, a force transmitting member pivoted at one end to said one handle and operatively connected at the other end of said member to said jaw case, the other of said handles having a cam and follower connection to said force transmitting member, the arrangement being such that relative movement together of said handles causes said member to move the jaws to effect a mandrel tensioning stroke with increasing mechanical advantage.

Claim 5

A hand tool for feeding mandrel-rivets comprising a pair of handles pivotally connected together, one of said handles carrying at one end a nosepiece adapted to receive a mandrel while abutting its rivet, said one handle slidably supporting a jaw case and mandrel gripping jaws therein in alignment with the nosepiece, a force transmitting member pivoted at one end to said one handle and operatively connected at the other end of said member to said jaw case, the other of said handles having a cam and follower connection to said force transmitting member, the arrangement being such that relative movement together of said handles causes said member to move the jaws to effect a mandrel tensioning stroke with increasing mechanical advantage.

Claim 6

A tool as in claim 3 wherein the cam of said cam and follower connection is a wall of a convex slot formed in said other handle, and said follower is a roller adapted to be received in said slot, the roller being carried by a pin in said member.

Claim 7

A tool as in claim 4 wherein the center of curvature of said cam wall is selected to define a line of action of the force applied to said roller, which line moves closer to the pivot connection of the pair of handles as said other handle is pulled toward said one handle.

Claim 8

A pliers-type tool for setting mandrel-rivets comprising a pair of pivotally connected handles, one of said handles having a tubular portion providing a rivet abutting end and another portion adapted to be engaged by the palm of one hand of an operator, a slidable jaw case in said tubular portion carrying cooperative jaws adapted to grip the stem of a rivet to be set, a force transmitting member pivoted to said one handle and operatively connected to the jaw case, the other of said handles being adapted at its free end portion to be pulled by the Fingers of the operator''s hand and formed at its other end portion with an arcuate slot, and said member carrying a roller adapted to ride in said slot, the arrangement being such that movement of said other handle toward said one handle and away from a structure in which the rivet is to be set causes a wall of said slot to bear with increasing mechanical advantage on said roller as the mandrel gripping jaws are thereby retracted from the structure.

Claim 9

A pliers-type tool for setting mandrel-rivets comprising a pair of pivotally connected handles, one of said handles having a tubular portion providing a rivet abutting end and another portion adapted to be engaged by the palm of one hand of an operator, a slidable jaw case in said tubular portion carrying cooperative jaws adapted to grip the stem of a rivet to be set, a force transmitting member pivoted to said one handle and operatively connected to the jaw case, the other of said handles being adapted at its free end portion to be pulled by the Fingers of the operator''s hand and formed at its other end portion with an arcuate slot, and said member carrying a roller adapted to ride in said slot, the arrangement being such that movement of said other handle toward said one handle and away from a structure in which the rivet is to be set causes a wall of said slot to bear with increasing mechanical advantage on said roller as the mandrel gripping jaws are thereby retracted from the structure.

Claim 10

A tool as in claim 6 wherein said other handle has its slotted end portion forked to straddle said force transmitting member, and a pin transversely extending through the member supports a pair of rollers respectively nested in aligned slots of said forked handle portion.

Claim 11

A tool as in claim 6 wherein the jaw case includes spring means and a tubular pusher for urging the jaws into mandrel gripping relation, and the end of said handle tubular portion remote from said rivet abutting end is open to allow passage therethrough of broken-off mandrel stems.