Indirect firing fastener driving tool
AssigneeSociete De Prospection Et D'Inventions Techniques Spit
InventorsRoland Almeras, Jean-Claude Vernerey
Life of this patent
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Abstract
An indirect firing fastener driving tool is provided including a barrel (51), a piston (6) sliding in the barrel for driving a fastener (3) housed in a fastener guide (7). Between the barrel (51) and the fastener guide (7) are disposed a rigid ring (22) and a resilient ring (24). Inside the resilient ring (24) is disposed a rigid ring (27) for limiting the stroke of the ring (22) intended to be received in a recess (25) provided at the rear part of the fastener guide (7). The head (14) of the piston is of a truncated cone shape and may cooperate with a bore (23) of corresponding shape in the rigid ring (22). The rings serve as absorber for the piston (6) whose stroke is thus controlled.
Claims13
An indirect firing fastener driving tool, including a piston mounted in a barrel for, under the action of the combustion gases of a propulsive charge, driving a fastener for fixing a work piece on a support, means for absorbing the piston energy being provided between the barrel and a fastener guide disposed in front of the barrel, for absorbing the excess propulsion energy of the piston and limiting its stroke, the absorbing means comprising, in combination, a ring arranged for cooperating with the piston, a first intermediate ring, made from a resilient material, disposed between the ring cooperating with the piston and the fastener guide, and a scond intermediate ring, made from a rigid but slightly deformable material, movable axially between the ring cooperating with the piston and the fastener guide, characterized in that the fastener guide and the second intermediate ring are arranged so the the length of the axial displacement of this second intermediate ring is equal to the maximum reduction of the axial dimension of the first intermediate ring after compression said first and second intermediate rings being concentrically disposed relative to each other.
The tool according to claim 6, wherein the length of the axial displacement of the second intermediate ring and the volume of the space surrounding said first intermediate ring are such that, at the end of the step of deformation of the first intermediate ring, when the second intermediate ring abuts against back bottom of the fastener guide, said volume is not null.
A fastener driving tool including a piston mounted within a barrel adapted to be driven by a propulsive charge to drive a fastener into a structure, and a fastener guide disposed in front of the barrel, means for damping the piston at the end of a driving stroke to absorb the kinetic energy and limit the stroke, said means including a ring or collar of rigid material disposed to be engaged and moved axially by said piston during the driving stroke, said collar being spaced axially from said fastener guide, first and second rings disposed concentrically within the space between said collar and said fastener guide, one of said first and second rings being a rigid material and the other of resilient material, whereby axial movement of said collar against the first and second rings causes the one of rigid material to move axially into engagement with the fastener guide while the ring of resilient material is compressed axially and expands radially thereby absorbing the energy and limiting the driving stroke.
Dependencies are inferred from the claim text.