Explosively actuated tools
AssigneeCetram Pty Limited
InventorDavid John McCullough
Life of this patent
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Abstract
A firing mechanism of an explosively actuated tool for driving a fastener into a substrate includes a cocking rod and sear for entraining the firing pin with the firing pin being releasable on cocking by rotation of the sear. The cocking rod and sear form a structure subject to an axial and rotational bias by a coil spring anchored at one end to the structure and at the opposite end to a mounting which during assembly of the mechanism is rotated to apply torsional loading to the spring and is then locked into a housing of the mechanism in an angular orientation in which torsional loading is maintained in the spring.
Claims10
An explosively actuated tool for driving a fastener into substrate said tool comprising:
- a barrel;
- a piston displaceable in the barrel on firing of the tool to drive a fastener from a forward end of the barrel into the substrate upon firing of a charge;
- and
- a firing mechanism comprising a firing pin, and a rotary sear pivotal between a first position in which the sear entrains the firing pin and a second position in which the sear is released whereby the firing pin is driven towards the charge to thereby fire the charge;
- wherein the rotary sear is carried by a cocking rod, and the cocking rod and the sear carried thereby is subject to a rotational and axial bias by a spring anchored at one end relative to the cocking rod and at the other end to a mounting, the mounting being rotatable to apply torsional loading to the spring and being lockable to a housing of the cocking rod in an angular orientation in which torsional loading is maintained in the spring.
An explosively actuated tool for driving a fastener into substrate, said tool comprising:
- a barrel;
- a piston displaceable in the barrel on firing of the tool to drive a fastener from a forward end of the barrel into the substrate upon firing of a charge;
- and
- a firing mechanism comprising a firing pin, and a rotary sear pivotal between a first position in which the sear entrains the firing pin and a second position in which the sear is released whereby the firing pin is driven towards the charge to thereby fire the charge;
- wherein the rotary sear is carried by a cocking rod, and the cocking rod and the sear carried thereby is subject to a rotational and axial bias by a spring anchored at one end relative to the cocking rod and at the other end to a mounting, the mounting being rotatable to apply torsional loading to the spring and being lockable to a housing of the cocking rod in an angular orientation in which torsional loading is maintained in the spring;
- and
- wherein the cap is of cylindrical form and is locatable into a cylindrical passage formed in the housing, the cap being releasably locked within the passage in a predetermined angular orientation to provide the required torsional loading.
An explosively actuated tool for driving a fastener into a substrate, said tool comprising:
- a barrel;
- a piston displaceable in the barrel on firing of the tool to drive a fastener from a forward end of the barrel into the substrate upon firing of a charge;
- and
- a firing mechanism including a firing pin, and a rotary sear pivotal between a first position in which the sear entrains the firing pin and a second position in which the sear is released whereby the firing pin is driven towards the charge to thereby fire the charge;
- wherein the rotary sear is carried by a cocking rod, and the cocking rod and the sear carried thereby is subject to a rotational and axial bias by a spring anchored at one end to the structure formed by the cocking rod and sear and at the other end to a mounting, the mounting being rotated during assembly of the firing mechanism to apply torsional loading to the spring and then being locked to a housing of the cocking rod and firing pin in an angular orientation in which torsional loading is maintained in the spring.
An explosively actuated tool for driving a fastener into a substrate, comprising a cocking rod with a sear for entraining a firing pin with the firing pin being releasable by rotation of the sear, the cocking rod and sear forming a structure subject to an axial and rotational bias by a coil spring anchored at one end to the structure and at the opposite end to a mounting which is incrementally rotatable to apply torsional loading to the spring and lockable to a housing of the mechanism in an angular orientation in which torsional loading is maintained in the spring.
An explosively actuated tool for driving a fastener into a substrate, comprising:
- a cocking rod with a sear for entraining a firing pin with the firing pin being releasable by rotation of the sear, the cocking rod and sear forming a structure subject to an axial and rotational bias by a coil spring anchored at one end to the structure and at the opposite end to a mounting;
- and
- means associated with the mounting for enabling incremental rotation of the mounting with respect to a housing to vary a torsional loading to the spring.
Dependencies are inferred from the claim text.