# US 9,435,594 B2 · Low ammunition warning switch > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,435,594 B2 - Document ID: US9435594B2 - Status: Granted - Kind: B2 - Application number: 14/856,838 - Filed: 2015-09-17 - Published: 2016-03-17 - Granted: 2016-09-06 - Earliest claimed: 2014-09-17 - Assignees: Contract Fabrication and Design, LLC - Applicants: Contract Fabrication and Design - Inventors: Jesse L. Davison; M. Damon Serkland; Jarrett O'Hara; Marvin Vale Riggall, Jr. - Web page: https://patentgrep.com/patent/US9435594B2 ## CPC - F41A 9/62: having means for indicating the number of cartridges left in the magazine, e.g. last-round indicators (last-round safeties F41A17/40) - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE ## Abstract An ammunition magazine, including a container configured to hold ammunition and dispense the ammunition to a weapon, and an indicator disposed in the container and configured to create a signal indicative of a predetermined amount of ammunition remains in the container. In one example embodiment, the indicator includes a sensor member configured to engage with the ammunition when more than the predetermined amount of ammunition remains in the container, and configured to not engage with the ammunition when less than the predetermined amount of ammunition remains in the container. A signal generator is coupled to the sensor member and configured to provide an electrical signal indicative of whether the sensor member is engaging the ammunition, or is not engaging the ammunition. ## Claims ### Claim 1 An ammunition magazine, comprising: a container configured to hold ammunition and dispense the ammunition to a weapon; and an indicator disposed in the container and configured to create a signal indicative of a predetermined amount of ammunition remains in the container, wherein the indicator comprises: a sensor member configured to engage with the ammunition when more than the predetermined amount of ammunition remains in the container, and configured to not engage with the ammunition when less than the predetermined amount of ammunition remains in the container, wherein the sensor member is comprised of a lever that is configured to have a first position when the container holds at least the predetermined amount of ammunition, and a second position when the container holds less than the predetermined amount of ammunition; a signal generator coupled to the sensor member and configured to provide an electrical signal indicative of whether the sensor member is engaging the ammunition, or is not engaging the ammunition; and a ledge member disposed over the lever and having a pivot coupled to the lever. ### Claim 2 (depends on 1) The ammunition magazine as specified in claim 1, wherein the lever engages the ammunition in the first position, and does not engage the ammunition in the second position. ### Claim 3 (depends on 2) The ammunition magazine as specified in claim 2 wherein the lever is configured to automatically transition from the first position to the second position when the ammunition stops engaging the lever. ### Claim 4 (depends on 2) The ammunition magazine as specified in claim 2, wherein the lever is positioned on a bottom of the container. ### Claim 5 (depends on 4) The ammunition magazine as specified in claim 4, wherein the sensor member is positioned at a central position on the bottom of the container. ### Claim 6 (depends on 4) The ammunition magazine as specified in claim 4, wherein the predetermined amount is a function of where the sensor member is positioned on the bottom of the container. ### Claim 7 (depends on 1) The ammunition magazine as specified in claim 1, wherein the signal generator comprises a switch. ### Claim 8 (depends on 1) The ammunition magazine as specified in claim 1, further comprising a spring configured to urge the lever to the second position. ### Claim 9 (depends on 8) The ammunition magazine as specified in claim 8, wherein the spring extends between one end of the lever and the ledge member. ### Claim 10 (depends on 1) The ammunition magazine as specified in claim 1, wherein the ledge member is configured to be disposed over a portion of the ammunition proximate the sensor member. ### Claim 11 (depends on 10) The ammunition magazine as specified in claim 10, wherein the portion of the ammunition proximate the sensor member is disposed between the ledge member and a bottom of the container. ### Claim 12 (depends on 11) The ammunition magazine as specified in claim 11, wherein the lever is configured to move between the first position and the second position in a direction parallel to the bottom of the container. ### Claim 13 (depends on 10) The ammunition magazine as specified in claim 10, wherein the ledge member is configured to wedge the portion of the ammunition in place. ### Claim 14 (depends on 13) The ammunition magazine as specified in claim 13, further comprising a vertical member configured to allow the ammunition to be draped over the vertical member and then wedged under the ledge member. ### Claim 15 (depends on 14) The ammunition as specified in claim 14, wherein the ledge member includes the vertical member. ### Claim 16 (depends on 1) The ammunition magazine as specified in claim 1, wherein the ledge member comprises a plate. ### Claim 17 (depends on 16) The ammunition magazine as specified in claim 16, wherein the ledge member is parallel to a bottom of the container. ### Claim 18 (depends on 1) The ammunition magazine as specified in claim 1, further comprising an opening in the ledge member configured to allow a user to see a bottom of the container from above the container when the lever is in the second position. ### Claim 19 An ammunition magazine, comprising: a container configured to hold ammunition and dispense the ammunition to a weapon and having a bottom; and an indicator disposed in the container and configured to create a signal indicative of a predetermined amount of ammunition remains in the container, wherein the indicator comprises: a lever configured to engage with the ammunition when more than the predetermined amount of ammunition remains in the container, and configured to not engage with the ammunition when less than the predetermined amount of ammunition remains in the container, wherein the lever is configured to pivot about an axis that is perpendicular to the bottom of the container to have a first position when the container holds at least the predetermined amount of ammunition, and a second position when the container holds less than the predetermined amount of ammunition; a signal generator coupled to the lever and configured to provide an electrical signal indicative of whether the lever is engaging the ammunition, or is not engaging the ammunition; and a ledge disposed inside the container at a position over the lever and configured to secure the ammunition in engagement with the lever when more than the predetermined amount of ammunition remains in the container.