# US 12,179,327 B2 · Fastener driving device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,179,327 B2 - Document ID: US12179327B2 - Status: Granted - Kind: B2 - Application number: 18/254,001 - Filed: 2021-12-07 - Published: 2023-12-21 - Granted: 2024-12-31 - Earliest claimed: 2020-12-16 - Assignees: Illinois Tool Works Inc. - Applicants: Illinois Tool Works Inc. - Inventors: Olivier Baudrand - Web page: https://patentgrep.com/patent/US12179327B2 ## CPC - B25C 1/08: operated by combustion pressure - B25C 1/008: {Safety devices} - B25C: HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS (for shoemaking A43D) ## Abstract A fastener driving device comprising a pressure chamber, a first piston, a fastener channel and a second piston. The first piston is coupled to the pressure chamber such that pressurized gas in the pressure chamber causes the first piston to slide from a first position to a second position. The fastener channel is configured to receive a fastener, wherein when moving from the first position to the second position the first piston is configured to engage a fastener and drive it from the device. The second piston is slidable within a sleeve and arranged such that when the first piston slides from the first position to the second position the first piston drives the second piston and compresses gas within the sleeve. Compressed gas in the sleeve biases the first piston towards the first position. ## Claims ### Claim 1 A fastener driving device comprising: a pressure chamber; a first piston coupled to the pressure chamber such that pressurized gas in the pressure chamber causes the first piston to slide from a first position to a second position; a fastener channel configured to receive a fastener, wherein when moving from the first position to the second position, the first piston is configured to engage a fastener and drive the fastener through the fastener channel and from the fastener driving device; a sleeve; and a second piston slidable within the sleeve and configured such that when the first piston slides from the first position to the second position, the first piston drives the second piston and compresses gas within the sleeve, wherein compressed gas in the sleeve biases the first piston towards the first position. ### Claim 2 (depends on 1) The fastener driving device of claim 1, wherein the pressure chamber comprises an exhaust configured to release pressurized gas after the fastener has been driven from the fastener driving device, and wherein when force of the compressed gas in the sleeve acting upon the second piston exceeds force of the gas in the pressure chamber acting upon the first piston, the second piston acts against the first piston to slide the first piston towards the first position. ### Claim 3 (depends on 2) The fastener driving device of claim 2, which comprises an additional chamber fluidically linked to the sleeve, the additional chamber configured to house compressed gas from the sleeve. ### Claim 4 (depends on 3) The fastener driving device of claim 3, wherein the additional chamber is parallel to or surrounds the sleeve. ### Claim 5 (depends on 4) The fastener driving device of claim 4, wherein gas within the sleeve or the additional chamber is pressurized above atmospheric pressure when the first piston is in the second position. ### Claim 6 (depends on 5) The fastener driving device of claim 5, which includes a nose portion and wherein the second piston and sleeve are positioned on the nose portion. ### Claim 7 (depends on 6) The fastener driving device of claim 6, wherein the second piston and sleeve are mounted on or parallel to the fastener channel. ### Claim 8 (depends on 7) The fastener driving device of claim 7, wherein the sleeve defines a rebalancing hole, wherein the first piston is configured to occlude the rebalancing hole when in the second position, and wherein the rebalancing hole is open when the first piston is in the first position to couple the sleeve to outside of the fastener driving device. ### Claim 9 (depends on 8) The fastener driving device of claim 8, wherein the pressure chamber is coupled to a pressurized gas reservoir configured to selectively pressurize the pressure chamber to drive the first piston from the first position to the second position. ### Claim 10 (depends on 9) The fastener driving device of claim 9, which is a combustion fastener driving device, and wherein combustion gas expansion within the pressure chamber drives the first piston from the first position to the second position. ### Claim 11 (depends on 10) The fastener driving device of claim 10, wherein the pressure chamber is coupled to the sleeve such that expanded combustion gas can be supplied to the sleeve to increase the gas pressure in the sleeve. ### Claim 12 (depends on 11) The fastener driving device of claim 11, wherein the pressure chamber is coupled to the sleeve via a one-way valve. ### Claim 13 (depends on 1) The fastener driving device of claim 1, which comprises an additional chamber fluidically linked to the sleeve, the additional chamber configured to house compressed gas from the sleeve. ### Claim 14 (depends on 13) The fastener driving device of claim 13, wherein the additional chamber is parallel to or surrounds the sleeve. ### Claim 15 (depends on 14) The fastener driving device of claim 14, wherein gas within the additional chamber is pressurized above atmospheric pressure when the first piston is in the second position. ### Claim 16 (depends on 1) The fastener driving device of claim 1, wherein gas within the sleeve is pressurized above atmospheric pressure when the first piston is in the second position. ### Claim 17 (depends on 1) The fastener driving device of claim 1, which includes a nose portion and wherein the second piston and sleeve are positioned on the nose portion. ### Claim 18 (depends on 17) The fastener driving device according to claim 17, wherein the second piston and sleeve are mounted on or parallel to the fastener channel. ### Claim 19 (depends on 1) The fastener driving device of claim 1, wherein the sleeve defines a rebalancing hole, wherein the first piston is configured to occlude the rebalancing hole when in the second position, and wherein the rebalancing hole is open when the first piston is in the first position to couple the sleeve to outside of the fastener driving device. ### Claim 20 (depends on 1) The fastener driving device of claim 1, wherein the pressure chamber is coupled to a pressurized gas reservoir configured to selectively pressurize the pressure chamber to drive the first piston from the first position to the second position.