Impact blow actuated pneumatic fastener driving tool

Details Impact blow actuated pneumatic fastener driving tool Impact blow actuated pneumatic fastener driving tool

B - Operations, Transporting

25

C

B25C 1/04 (2006.01) B25C 7/00 (2006.01)

Patent

CA 2298865

The nailing tool has a hollow main body including a valve slidable therein. The main body includes a compressed air reservoir, the compressed air keeping the valve closed in a resting position. An anvil is provided at the upper end of the tool, with an empty annular chamber at atmospheric pressure being located under the anvil and over a ring integrally attached to the valve. Thus, if a hammer blow is dealt on the anvil, the latter loosely slides inside the main body, without reaching the ring, with the valve remaining closed and no fastener being expelled from the tool. Upon a trigger being activated on the tool handle, compressed air fills the annular chamber between the anvil and the ring. In this condition, upon a hammer blow being dealt on the anvil, the impact of the blow is transmitted by the compressed air to the underlying ring, consequently opening the valve. The opened valve allows compressed air to flow into an underlying piston drive chamber, where a piston is driven by the sudden compressed air inflow to drive a fastener out of the tool. Air exhaust channels allow the piston and the valve to return in their initial resting positions after a nail has been expelled from the tool.

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