# US 11,451,904 B2 · Audible end cap and handheld metal detector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,904 B2 - Document ID: US11451904B2 - Status: Granted - Kind: B2 - Application number: 17/168,183 - Filed: 2021-02-05 - Published: 2022-06-23 - Granted: 2022-09-20 - Earliest claimed: 2020-12-21 - Applicants: Shenzhen Checkpoint Security Electronics Co., Ltd. - Inventors: Maoquan Deng - Web page: https://patentgrep.com/patent/US11451904B2 ## CPC - H04R 1/44: Special adaptations for subaqueous use, e.g. for hydrophone - G01V 3/165: operating with magnetic or electric fields produced or modified by the object or by the detecting device (with electromagnetic waves G01V3/17) - H04R 1/021: {incorporating only one transducer} - H04R 1/028: {associated with devices performing functions other than acoustics, e.g. electric candles} - H04R 1/28: Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means {(combinations of transducers with horns, i.e. front-loaded horns H04R1/30)} - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) - G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02) ## Abstract An audible end cap is provided, including a waterproof loudspeaker for generating multiple alarm sound combinations, wherein the diameter of the waterproof loudspeaker is greater than 2 cm; a back cover provided with a first connecting portion whereby the back cover is capable of being fixedly installed on a metal detector, wherein the waterproof loudspeaker is installed in the back cover; an audio connector, electrically connected to the waterproof loudspeaker, wherein the waterproof loudspeaker is capable of receiving and emitting the sound signal output by the metal detector through the electrical connection between the metal detector and the audio connector. The waterproof loudspeaker is installed in the back cover through multiple waterproof designs. The audible component and the main body of the metal detector, which can be charged after the back cover is removed, are designed separately. When damaged, the loudspeaker can be replaced separately without replacing the entire circuit board. ## Claims ### Claim 1 An audible end cap, comprising: a waterproof loudspeaker, for generating multiple alarm sound combinations, wherein the diameter of the waterproof loudspeaker is greater than 2 cm; a back cover provided with a first connecting portion whereby the back cover is capable of being fixedly installed on a metal detector, wherein the waterproof loudspeaker is installed in the back cover; an audio connector electrically connected to the waterproof loudspeaker, wherein the waterproof loudspeaker is capable of receiving and emitting the sound signal output by the metal detector through the electrical connection between the metal detector and the audio connector; wherein the audible end cap further comprises a protective collar, a first protective bracket, and a second protective bracket, wherein the waterproof loudspeaker is fixedly clamped between the first protective bracket and the second protective bracket, wherein the protective collar is fixedly installed in the back cover and is sleeved and fixed on the outer periphery of the first protective bracket and the second protective bracket, and wherein the first protective bracket, the second protective bracket and the waterproof loudspeaker are all contained in the back cover. ### Claim 2 (depends on 1) The audible end cap according to claim 1, wherein the protective collar is provided with a snapping groove, the first protective bracket comprising a first snapping ring plate, and the second protective bracket comprising a second snapping ring plate, wherein the first snapping ring plate and the second snapping ring plate abut against each other and are fixedly engaged in the snapping groove. ### Claim 3 (depends on 1) The audible end cap according to claim 1, wherein the first protective bracket further comprises a docking ring plate, and the second protective bracket is provided with a docking groove, wherein the docking ring plate is inserted into the docking groove when the first protective bracket and the second protective bracket clamp and fix the waterproof loudspeaker. ### Claim 4 (depends on 1) The audible end cap according to claim 1, wherein the back cover is provided with a receiving cavity, and the protective collar is fixedly installed in the receiving cavity. ### Claim 5 (depends on 1) The audible end cap according to claim 1, wherein the second protective bracket further comprises a mounting barrel, and the audio connector penetrates the entire mounting barrel. ### Claim 6 A handheld metal detector, comprising a host and an audible end cap, wherein the audible end cap comprises: a waterproof loudspeaker, for generating multiple alarm sound combinations, wherein the diameter of the waterproof loudspeaker is greater than 2 cm; a back cover provided with a first connecting portion whereby the back cover is capable of being fixedly installed on a metal detector, wherein the waterproof loudspeaker is installed in the back cover; an audio connector electrically connected to the waterproof loudspeaker, wherein the waterproof loudspeaker is capable of receiving and emitting the sound signal output by the metal detector through the electrical connection between the metal detector and the audio connector; wherein the host is provided with a second connecting portion, and the back cover is capable of being installed on the tail portion of the host through the screw connection between the first connecting portion and the second connecting portion. ### Claim 7 (depends on 6) The handheld metal detector according to claim 6, wherein the audible end cap further comprises a protective collar, a first protective bracket, and a second protective bracket, wherein the waterproof loudspeaker is fixedly clamped between the first protective bracket and the second protective bracket, wherein the protective collar is fixedly installed in the back cover and is sleeved and fixed on the outer periphery of the first protective bracket and the second protective bracket, and wherein the first protective bracket, the second protective bracket and the waterproof loudspeaker are all contained in the back cover. ### Claim 8 (depends on 7) The handheld metal detector according to claim 7, wherein the protective collar is provided with a snapping groove, the first protective bracket comprising a first snapping ring plate, and the second protective bracket comprising a second snapping ring plate, wherein the first snapping ring plate and the second snapping ring plate abut against each other and are fixedly engaged in the snapping groove. ### Claim 9 (depends on 7) The handheld metal detector according to claim 7, wherein the first protective bracket further comprises a docking ring plate, and the second protective bracket is provided with a docking groove, wherein the docking ring plate is inserted into the docking groove when the first protective bracket and the second protective bracket clamp and fix the waterproof loudspeaker. ### Claim 10 (depends on 7) The handheld metal detector according to claim 7, wherein the back cover is provided with a receiving cavity, and the protective collar is fixedly installed in the receiving cavity. ### Claim 11 (depends on 7) The handheld metal detector according to claim 7, wherein the second protective bracket further comprises a mounting barrel, and the audio connector penetrates the entire mounting barrel. ### Claim 12 (depends on 6) The handheld metal detector according to claim 6, wherein the host is further provided with an audio output interface, and the audio connector is capable of being inserted into the audio output interface. ### Claim 13 (depends on 6) The handheld metal detector according to claim 6, wherein a waterproof ring is fixedly sleeved at the bottom of the outer circumference of the second connecting portion, wherein the waterproof ring is capable of abutting against the first connecting portion when the first connecting portion is screwed and rotated to the bottom of the second connecting portion.