# US 2016/0355391 A1 · Dispensing gun > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0355391 A1 - Document ID: US20160355391A1 - Status: Published application - Kind: A1 - Application number: 15/120,987 - Filed: 2015-02-23 - Published: 2016-12-08 - Earliest claimed: 2014-02-26 - Assignees: Identic AB - Applicants: Identic AB - Inventors: Mats TÖRNGREN - Web page: https://patentgrep.com/patent/US20160355391A1 ## CPC - B67D 7/54: with means for preventing escape of liquid or vapour or for recovering escaped liquid or vapour (B67D7/44 takes precedence) - B67D 7/04: for transferring fuels, lubricants or mixed fuels and lubricants - B67D: DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR (cleaning pipes or tubes or systems of pipes or tubes B08B9/02; emptying or filling of bottles, jars, cans, casks, barrels, or similar containers, not otherwise provided for B67C; water supply E03; pipe systems F17D; domestic hot-water supply systems F24D; measuring volume, volume flow, mass flow or liquid level, metering by volume G01F; coin-freed or like apparatus G07F) ## Abstract The present disclosure relates to a dispensing gun with increased safety. The dispensing gun comprises an expansion chamber into which liquid trapped inside the dispensing gun can escape in case of expansion of said liquid, thereby avoiding an increase of pressure inside the dispensing gun resulting from such an expansion which could damage internal components, such as the outlet valve arrangement. ## Claims ### Claim 1 Dispensing gun comprising: an inlet adapted to be connected to a device for delivering liquid to the dispensing gun, an outlet adapted to be inserted into and/or connected to a recipient of a liquid to be dispensed by the dispensing gun, a housing, a central body piping forming a main flow path for the liquid to be dispensed from the inlet to the outlet, an outlet valve arrangement arranged at or in proximity of the outlet, and an expansion chamber arranged inside the housing, said expansion chamber being separated from the main flow path and from the outlet valve arrangement, the expansion chamber being adapted to be in liquid communication with the main flow path via at least one through-hole in the central body piping to allow liquid to enter said expansion chamber in case of expansion of liquid contained in the main flow path. ### Claim 2 (depends on 1) Dispensing gun according to claim 1, wherein the expansion chamber is divided into a first portion adapted to receive liquid from the main flow path in case of expansion of liquid contained in the main flow path and a second portion adapted to not receive any liquid from the main flow path. ### Claim 3 (depends on 1) Dispensing gun according to claim 1, wherein the expansion chamber comprises a piston moveable in a first direction in response to an expansion of liquid contained in the main flow path. ### Claim 4 (depends on 3) Dispensing gun according to claim 3, wherein the piston is spring loaded, by means of a spring. ### Claim 5 (depends on 1) Dispensing gun according to claim 1, wherein the expansion chamber is essentially cylindrical and concentrically arranged with a central axis of the central body piping. ### Claim 6 (depends on 1) Dispensing gun according to claim 1, wherein an outer surface of the central body piping at least partially forms a first wall of the expansion chamber. ### Claim 7 (depends on 6) Dispensing gun according to claim 6, wherein said at least one through-hole in the central body piping is arranged in said first wall of the expansion chamber. ### Claim 8 (depends on 7) Dispensing gun according to claim 7, wherein the at least one through-hole is arranged in said first wall such that it opens into upper portion of the expansion chamber. ### Claim 9 (depends on 7) Dispensing gun according to claim 7, wherein the at least one through-hole is arranged in said first wall such that it opens into a lower portion of the expansion chamber. ### Claim 10 (depends on 3) Dispensing gun according to claim 3, wherein the piston is adapted to be located essentially over the at least one through-hole during a dispensing procedure. ### Claim 11 (depends on 2) Dispensing gun according to claim 2, wherein the expansion chamber comprises at least one ventilation hole arranged in a wall of the expansion chamber, wherein said ventilation hole arranged in said second portion adapted to not receive any liquid from the main flow path. ### Claim 12 (depends on 3) Dispensing gun according to claim 3, wherein the piston is provided with a sealing mechanism, said sealing mechanism comprising at least one O-ring, to provide a liquid tight seal between the piston and a wall of the expansion chamber. ### Claim 13 (depends on 3) Dispensing gun according to claim 3, wherein the piston is essentially cylindrical.