# US 5,699,687 A · Firearm security device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,699,687 A - Document ID: US5699687A - Status: Granted - Kind: A - Application number: 08/659,291 - Filed: 1996-06-06 - Granted: 1997-12-23 - Earliest claimed: 1996-06-06 - Inventors: John M. Pittman - Web page: https://patentgrep.com/patent/US5699687A ## CPC - F41A 17/44: Safety plugs, e.g. for plugging-up cartridge chambers {, barrels, magazine spaces} - F41A 17/02: Key-operated safeties {(F41A17/44 takes precedence)} - Y10T 70/20: Attack-actuated defeating mechanisms - Y10T 70/40: Portable - Y10T 70/50: Special application - Y10T 70/5009: For portable articles - Y10T 70/7689: Tumblers - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A firearm-securing device providing tamper resistance features which device includes a keyway that operates a threaded rod which, in turn, controls spring-loaded cams that obstruct a tubular area including a chamber, a barrel, and a muzzle of a firearm. The cams have either fixed or articulated contact pads. Operating the keyway in clockwise rotation causes the cams to wedge against the inner chamber and barrel surfaces, locking the device in place. Counterclockwise keyway rotation unseats the cams, allowing the device to be remove from the chamber and barrel and thus allow operation of the firearm. The device includes several components designed to minimize tampering of the device itself as well as tampering of the firearm. ## Claims ### Claim 1 A locking device for controlling access to a length of a tubular element having an inner surface, said locking device comprising: a shaft having one or more conical sections, one or more sets of cams engageable with said one or more conical sections of said shaft, wherein at least one cam of each of said one or more sets of cams has a contact pad pivotably mounted thereon and substantially conforming with a shape of said inner surface of said tubular element, a lock mechanism, and a control means for use within said lock mechanism to control movement of said shaft. ### Claim 2 (depends on 1) The locking device as claimed in claim 1, wherein said lock mechanism is a double-sided pin tumbler lock. ### Claim 3 (depends on 2) The locking device as claimed in claim 2, wherein said lock mechanism includes a plurality of pins. ### Claim 4 (depends on 1) The locking device as claimed in claim 1, wherein said control means is a safety key which enables and disables said locking device and is maintained within said lock mechanism during operation and use of said locking device. ### Claim 5 (depends on 1) The locking device as claimed in claim 1, wherein said control means is a removable key which enables and disables said locking device. ### Claim 6 (depends on 1) The locking device as claimed in claim 1, wherein said contact pads are replaceable and are made of a material of a hardness not more than a hardness of said inner surface of said tubular element. ### Claim 7 (depends on 6) The locking device as claimed in claim 6, further comprising a bi-directional slip gear couplable to said shaft, wherein said bi-directional slip gear is design to protect internal components and associated surfaces of said device within said tubular element when said device is activated or de-activated. ### Claim 8 (depends on 1) The locking device as claimed in claim 1 further comprising: a pyric disk located within said lock mechanism, wherein said pyric disk is made of a material which has a melting point lower than substantially all other parts of said locking device. ### Claim 9 (depends on 1) The locking device as claimed in claim 1 further comprising: a compression spring couplable to said lock mechanism. ### Claim 10 (depends on 1) The locking device as claimed in claim 1 further comprising: a substantially cylindrical means for housing said cams, wherein said cylindrical means is superimposed upon said shaft, and said cams, upon engagement by said shaft, are displaced from a fixed position within said cylindrical means. ### Claim 11 (depends on 1) The locking device as claimed in claim 1 further comprising: a plurality of disks spaced axially along said shaft and couplable to said locking mechanism, a compression spring couplable to said shaft, a plurality of axially-oriented, freely-rotatable pins couplable to said compression spring, a plurality of bearings within said locking mechanism, and a bushing couplable to said locking mechanism, wherein said disks, said compression spring, said pins, said bearings, and said bushing are strategically located to provide a physical barrier against tampering. ### Claim 12 (depends on 1) The locking device as claimed in claim 1, wherein said lock mechanism includes a lock housing and a lock foundation arranged together to protectively house one of either end of said tubular element. ### Claim 13 (depends on 12) The locking device as claimed in claim 12, further comprising a cushion to protect said one of either end of said tubular element. ### Claim 14 A locking device for controlling access to a length of a tubular element having an inner surface, said locking device comprising: a shaft having one or more conical sections, one or more sets of cams arranged in sets of at least two diametrically-opposed cams and engageable with said one or more conical sections of said shaft, each of said cams including a contact pad, wherein at least one of said contact pads of each of said one or more sets of cams has a contact surface substantially conforming with a shape of said inner surface of said tubular element, a lock mechanism, a control means for use within said lock mechanism to control shaft movement, and pyric disk located within said lock mechanism, wherein said pyric disk is made of a material which has a melting point lower than substantially all other parts of said locking device. ### Claim 15 (depends on 14) The locking device as claimed in claim 14, further comprising: a substantially cylindrical means for housing said cams, wherein said cylindrical means is superimposed upon said shaft, said cams, upon engagement by said shaft, are displaced from a fixed position within said cylindrical means, and wherein each of said set of cams includes at least two cams, wherein cams within any one of said sets are placed in diametric opposition to one another. ### Claim 16 (depends on 15) The locking device as claimed in claim 15, wherein said contact pads are made of a material of a hardness not more than a hardness of said inner surface of said tubular element. ### Claim 17 (depends on 16) The locking device as claimed in claim 16, wherein said contact pads are fixedly mounted upon said cams. ### Claim 18 (depends on 16) The locking device as claimed in claim 16, wherein said contact pads are pivotably mounted upon said cams. ### Claim 19 (depends on 14) The locking device as claimed in claim 14, further comprising: a lock housing coupled to a lock foundation, wherein said lock housing is designed to surround an exterior of said tubular element, and wherein an end of said lock foundation includes a cushion designed to abut an open end of said tubular element. ### Claim 20 (depends on 14) The locking device as claimed in claim 14, wherein said locking device occupies substantially all of an interior of said tubular element. ### Claim 21 A locking device for controlling access to a length of a tubular element, said locking device comprising: a shaft, a plurality of cams arranged in at least two sets and enagageable by said shaft, each of said cams including a contact pad made of a material of a hardness not more than a hardness of any tubular element surface upon which said contact pads rest during operation of said locking device, a substantially cylindrical means for housing said cams, wherein said cylindrical means is superimposed upon said shaft, said cams, upon engagement by said shaft, are displaced from a fixed position within said cylindrical means, wherein each of said set of cams includes at least two cams, wherein cams within anyone of said sets are placed in diametric opposition to one another, a lock mechanism including a double sided pin tumbler lock, a control means for use within said lock mechanism to control shaft movement, a pyric disk located within said lock mechanism, wherein said pyric disk is made of a material which has a melting point lower than substantially all other parts of said locking device, and a bi-directional slip gear couplable to said shaft, wherein said bi-directional slip gear is designed to protect internal components and associated surfaces of said device within said tubular element when said device is activated or deactivated. ### Claim 22 (depends on 21) The locking device as claimed in claim 21, wherein said bi-directional slip gear is couplable to a spring-loaded wedge within an annulus such that upon activation or de-activation of said device, contact between said wedge and said slip gear that causes a slippage of said wedge over said slip gear creates an audible noise designed to indicate that said locking device is fully engaged or fully disengaged. ### Claim 23 (depends on 21) The locking device as claimed in claim 21, wherein said control means is a safety-key which enables and disables said device and is maintained within said lock mechanism during operation and use of said locking device. ### Claim 24 (depends on 21) The locking device as claimed in claim 21, wherein said control means is a removable-key which enables and disables said locking device. ### Claim 25 (depends on 21) The locking device as claimed in claim 21, further comprising a chamber plug couplable to an end of said tubular element. ### Claim 26 (depends on 25) The locking device as claimed in claim 25, wherein said contact pads and said chamber plug are fabricated in shapes and of materials designed to be replaceable. ### Claim 27 (depends on 21) The locking device as claimed in claim 21, wherein said cams are designed to be fully containable within said cylindrical means such that said device may be inserted into or removed from said tubular element without said cams causing damage to an interior of said tubular element. ### Claim 28 (depends on 21) The locking device as claimed in claim 21, wherein said contact pads of said cams are designed to maximize surface-to-surface contact between said cams and an interior surface of said tubular element.