Abstract: Certain aspects are directed to an anti-theft wheel locking system with independent locking mechanisms configured to protect the wheels and rims of an automobile is disclosed. The anti-theft wheel locking system comprises a fastener with a hollow chamber located on one end of the fastener and a plurality of lock pin slots disposed around an exterior of the fastener; a detachable lock with a plurality of retractable lock pins that match the design and dimensions of the hollow chamber and the lock pin slots respectively; a cap that screws onto a threaded head of the fastener; a cap key configured to unlock the cap via the unique key protrusions located on a bottom of the cap key; and an adapter configured to install and remove the fastener when the detachable lock is removed.

Abstract: The present application is directed to an anti-theft lug nut assembly and/or system for vehicular wheel use. A lug nut assembly of this application may be used in connection with each wheel of a particular vehicle. In another instance, multiple lug nut assemblies may be used in connection with a single wheel of a vehicle. In such instances, the lug nut assemblies may incorporate a common key member or distinct key members for use with each distinct lug members. Common wrenches and sockets are unable to engage and turn the lug member of this application as a result of the outer surface configuration of the lug member.

Abstract: A lug nut system for a wheel includes a rigid body having at a first end a tapered rim and a threaded aperture adapted to engage at least one threaded stud of the wheel. The body includes a tool engagement section, and a threaded shaft at a second end of the body adapted for receiving an ornamental cap. A cover has a first open end, a sleeve adapted for fitting over the body, and a cap at a second end that includes an aperture for the threaded shaft of the body. Preferably the sleeve has a cylindrical inside surface, such that the sleeve is free to rotate when in place over the body, thereby inhibiting removal of the wheel. The cover further hides any tool marks on the tool engagement section of the rigid body.

Abstract: A system for mounting a stanchion on a structure includes a base plate, a stanchion coupled to the base plate, and a number of base plate flanges coupled to the base plate. The base plate flanges to couple the base plate to at least one joist of the structure. The stanchion protrudes through the surface of the structure to a first side of the structure while the base plate and the base plate flanges remain on a second side of the surface of the structure.

Abstract: A vehicle wheel lock assembly includes a main body and a hollow cylindrically-shaped sleeve. The main body has a wheel contacting end, a sleeve retaining section and a key receiving end that includes surface contours defining a first key pattern. The hollow cylindrically-shaped sleeve has a first end and a second end, the first end being open with the main body extending therein. The sleeve retaining section retains the sleeve to the main body for free rotation about a central axis of the main body. The sleeve retaining section further is configured to prevent movement of the sleeve in an axial direction of the main body. The second end is closed covering the key receiving end and includes a key receiving aperture providing access to the first key pattern.

Abstract: An antitheft locking device (11), in particular for fixing a wheel to a motor vehicle hub, made in form of a nut or bolt, comprising a body (13) provided with engagement means (21) for a complementary key by means of which it is possible to rotate said device, and an associated bushing (19) freely rotatable around said body (13), in which at least a radial seat (25) is provided for at least a retaining element (23) capable of preventing the axial withdrawal of the bushing (19) from the body (13), said seat being obtained partially in the body (13) of the device and partially in the bushing (19), wherein said seat (25) has a depth varying along the axial direction.

Abstract: A theft prevention assembly for use on an externally threaded outer end of a fuel tank filling neck includes an outer cap, an internally threaded inner cap for mounting on the filling neck, and a lock assembly defined by a cup attached to the inner cap, a sleeve slidably in the cup and a lock in the sleeve. The outer cap is normally freely rotatable relative to the fixed inner cap, the cup and the sleeve which are releasably interconnected by the lock. When the cup is released from the sleeve, the inner cap is latched to the outer cap by the sleeve, and the two caps can be rotated as a unit to open the filling neck.

Abstract: An assembly unit attachable to a base structure has at least one assembly part with a through opening and at least one fastener with a radially expanded head and a shaft that is provided with a fastening section extends through the through opening and is held captive therein. The shaft is encircled by a sleeve and the head of the fastener projects in a radial direction over the sleeve. Two stop elements project from the outer circumferential surface of the sleeve. An axial catch projects from the wall of the through opening. The axial catch and the stop elements are embodied such that they can be moved past each other in axial direction. The axial catch inside the through opening and the second stop element on the outer circumferential surface are respectively arranged in an axial position. The fastening section is arranged in a specific axial position relative to the surface of the assembly part that is facing away from the head.

Abstract: A bolt assembly includes a head having a lock connected thereto which includes an eccentric rod with a curved outer periphery and a flat surface. A bead is retractably connected to an outer periphery of the curved outer periphery. A shank has teeth in an outer periphery thereof and has an end plate which has recesses such that the curved outer periphery of the eccentric rod can be selectively and removably engaged with one of the recesses by using a key to operate the lock. A cover is connected to an underside of the head. The shank is co-rotated with the head when the curved outer periphery of the eccentric rod is engaged with one of the recesses. When the curved outer periphery of the eccentric rod is removed from the recesses, the head is independently rotated relative to the shank so that the bolt assembly cannot be unscrewed.

Abstract: A method and device helps to prevent theft of sonar devices and GPS units from the brackets they are normally installed on or mounted to. The present invention provides for a unique locking device having a threaded end. The locking device is capable of alternatively permitting and prohibiting rotation of the threaded end. When a key is turned to lock the device, the handle of the device is permitted to rotate freely and the device does not permit rotation and removal of the threaded end. The device also provides for a hardened spacer that directly abuts the handle such that it prevents a thief from getting access to, and thus cutting the threaded end of the locking device.

Abstract: The lock assembly has a lock housing assembly, a driven assembly and a lock core. The driven assembly and the lock core are mounted in the lock housing assembly. The driven assembly has a connector and is selectively engaged to the lock core to allow the connector to be rotated to lock or unlock an object. The connector is able to lock two objects together or can connect an object to a stationary fixture with an optional cable, and the connector can be changed so a lock manufacturer can use this lock assembly to make many different kinds of locks.

Abstract: A lock including a lock body, lock cylinder, a threaded member and an engagement member. The engagement member moves within the lock body to engage the threaded member in at least two different positions. One of the positions allows the lock threaded member to be tightened onto a corresponding threaded connection and then locked into place, thereby securing the object which contains the threaded connection. Another one of the positions allows the lock threaded to be loosened from the corresponding threaded connection and thereby allows the lock to be removed from the object which contains the threaded connection.

Abstract: A locking fastener device for coupling to an item. The locking fastener device includes a body member having a shaft portion and a head portion. The shaft portion is designed for selectively coupling to structure. The head portion selectively engages the shaft portion whereby the shaft portion is selectively rotatable by the head portion when the head portion is rotated by a user.

Abstract: A safety pin and a magnetic key to actuated, loosen or tighten the pin, which incorporate means to automatically and by magnetic attraction connect a body of a cavity of a head of the pin, formed by a fixed part at an end of a road and by a movable par, by applying the key. The safety head of the pin delimits a totally closed cavity for a body of magnetic material, enable to slide axially while transmitting torque inside the cavity, provided with lateral locking means cooperating with similar means of the body, which is pressed against a bottom of the cavity by a spring supported by an upper base of the movable part, having external torque transmitting locking means for corresponding ones in the key.

Abstract: A lock nut designed for securing a nut on bolt, specifically for those situations in which the bolt cannot be rotated and the bolt is located proximate to an object that can obstruct the ability to rotate the lock nut on the bolt. The lock nut can change form by the addition of pieces, the removal of pieces, or by changing the shape of a single piece. The lock nut is designed such that in one form it can be threaded onto the bolt and, thereafter, it can be changed in form and locked into this new form, the new form being such that the lock nut cannot be fully rotated on the bolt without encountering an obstruction, thus preventing the ability to remove the lock nut.

Abstract: The present invention is a locking device for securing outboard motors and stern drives mounted on a plurality of exposed studs on the stern of a boat, and construction equipment on a plurality of studs inset in concrete or other media and other items which can be mounted. The invention is comprised of a 304 work hardened stainless steel body which has two blind holes connected by a slot. In one blind hole, a keyed lock assembly is fitted. The keyed lock deploys a catch which engages a groove in a stainless steel lock pin. The lock pin can be attached to items having protruding studs or other protuberances.

Abstract: A lock including a lock body, lock cylinder, a threaded member and an engagement member. The engagement member moves within the lock body to engage the threaded member in at least two different positions. One of the positions allows the lock threaded member to be tightened onto a corresponding threaded connection and then locked into place, thereby securing the object which contains the threaded connection. Another one of the positions allows the lock threaded to be loosened from the corresponding threaded connection and thereby allows the lock to be removed from the object which contains the threaded connection.

Abstract: The present invention provides for a key and bolt lock device. The key is constructed in a housing shell to be received by the head of the bolt. The key includes a power source, typically a battery, and a transmit coil which is capable of transmitting both energy and data from the key to a receiving coil in the bolt. This energy and data transfer is usually conducted by magnetic coupling. The key also includes a memory device for storing security codes which are used to compare to security codes stored in the bolt as well as a device for retrieving and transmitting the security code, typically an 8-bit microcontroller. The bolt has a body which is operatively associated with a head of the bolt so that the head rotates on the body when the bolt is in a locked position. The bolt also includes a latching device which is capable of attaching the head of the bolt to the body of the bolt so that the head and body may be rotated together.

Abstract: A vehicle article carrier apparatus adapted for use with a cargo bed of a vehicle such as a pick-up truck. The apparatus generally comprises a pair of cross rails each having a length sufficient to span the width of the cargo bed and to be supported on upper surfaces of the sidewalls of the cargo bed. A securing mechanism includes a threaded bolt and a threaded nut which clampingly secures a bracket to an inner lip portion of the sidewall and an undersurface of the cross rail to thus secure the cross rail to the sidewalls of the cargo bed. When an optional lock member is locked in place via a key, a threaded nut housed therein cannot be loosened when the lock member is in a locked position, and therefore the cross rail cannot be moved from the cargo bed.

Abstract: A theft prevention device for use in the mounting of automotive audio equipment, such as a two-way radio to a secure structure, such as a "U" bracket or trunnion. The invention is a generally conical-shaped mounting knob that threadably attaches the audio equipment to the mounting bracket. Attached to one end of the knob enclosure is a key lock and attached to the opposite end is a threaded stud that is able to rotate about the longitudinal axis of the enclosure. In operation, the knob, in its unlocked position, is rotated clockwise until the threaded stud is securely attached to its threaded counterpart on the radio. In this position, the lock assembly rotates a cam plate so that an engaging disc engages both the knob enclosure and a stud plate allowing torque applied to the enclosure to be transferred to the threaded stud. The knob is then locked.

Abstract: A fire hydrant locking arrangement which is intended for utilization on a conventional fire hydrant. Moreover, also disclosed is a method of producing a fire hydrant locking arrangement through a heat-meltable locking ring which will inhibit the unauthorized opening of fire hydrants while facilitating the ready servicing of the internal components of the fire hydrant.

Abstract: A lockable adjustment mechanism (1) for an adjustable component (2), the adjustment mechanism (1) comprising a first rotatable body portion (3) adapted in use to receive and be attached to a threaded elongated adjustment member (4) of the adjustable component (2), a second non-rotatable body portion (5) attachable to the adjustable component (2) and through which the threaded adjustment member in use passes, means (7, 9) for retaining a selected relative position between the first and second body portions, a third body portion (13) rotatably mounted on the first body portion (3) and lock means (17) operable to lock the third body portion (13) to the first body portion (3), rotation of the third body (13) effecting rotation of the first body portion (3) when locked thereto and thus effecting longitudinal movement of the adjustment member (4) of the adjustable component (2), the third body portion (13) being freely rotatable when not locked to the frist body portion (3) so as not to have any effect on the setti

Abstract: Improvements relating to fire hydrant closures are disclosed in which a cap-shaped cover for the outflow port from a fire hydrant, and a tool for locking and unlocking the cap on the hydrant, is provided. The cap includes a septum-like strong plate which is freely rotatable with the cap, but which is fixed against axial movement relative to the cap. Such septum-like plate, including means for mating engagement with corresponding means at the outflow spigot. The plate further includes means constructed to become engaged by the tool; the tool having a grip portion and a mating portion with a corresponding portion provided on the cap.

Abstract: A locking system for use with a wheeled vehicle such as a bicycle is described. The system is useful either to lockingly secure a wheel to the fork members of a bicycle or to lockingly secure the seat post to the center frame member. The locking member is cylindrical in shape and covers a specially configured nut that replaces the usual lever operated nut used with a spindled axle system.

Abstract: A drum lock device is disclosed for an open-head drum which has a flanged lip at the open end with a mating lid therefor. The drum lock device has a lug-type ring closure, a lockable bolt, and a shuttle wrench captively held on the bolt by a cap. The ring closure, which annularly attaches the lid to the lip, has a split therethrough with internally threaded lugs on either side. The shuttle wrench is captively held between the cap and the apertured boss of the bolt, and is slidably positionable between engagement with and disengagement from the lockable bolt. When the shuttle wrench is engaged, the lockable bolt is enabled, and, when the shuttle wrench is disengaged the rotation of the lockable bolt is disabled.

Abstract: The device comprises a sleeve (10,10') which serves to cover the polygonal head (4) of a wheel nut or bolt. The sleeve supports a lock cylinder (18) from which a locking member (28,36) projects for co-operating with a radial shoulder (6,6') formed in the head (4). The locking member (28,36) is retracted by means of a key (24) rotating the cylinder plug (20,20'). The sleeve (10,10') can be pushed on to the head (4) without using the key (24). The locking member (28,36) may be constituted by a latch (28) or annular spring (36).

Abstract: A king pin lock for preventing unauthorized movement of a trailer when detached from a tractor includes a hemispherical boby member having a flat planar face which faces the bottom surface of the trailer, when installed. A cylindrical trailer king pin has a circumferential groove for engagement into the fifth wheel of a towing tractor vehicle. The king pin lock has an aperture dimensioned to allow insertion of the trailer king pin. A pair of arcuate locking arms are pivotally mounted for radial movement within the hemispherical body member into and out of engagement with the king pin groove. A key actuated cam mechanism moves the locking arms between the lock and unlock positions. The locking mechanisms are assembled on a removable locking shell which may be replaced if necessary.

Abstract: A wheel lock apparatus is set forth wherein a wheel mount threadedly attaches to an existing axle bolt for securement of a conventional automotive wheel thereto. A reciprocating butterfly latch is mounted within diametrically spaced slots of the wheel mount and is positionable from a retracted position to an extended position by means of an overlying coaxial lock bolt mounted within a positioning cylinder, whereupon positioning of the butterfly latch to the extended orientation enables selective latching of a main hexagonal body containing the positioning cylinder and lock bolt. Upon latching of the main hexagonal body, the wheel mount may be secured or withdrawn from the associated threaded axle mounting member.

Abstract: A device for protecting motor-vehicles against theft comprising a freely rotatable sleeve covering the polygonal head of a wheel nut or screw, into which sleeve a cylinder lock engages rotatably, which lock is provided with at least one tumbler entering the inner wall of a cylinder lock location cavity of said polygonal head which projects beyond the circumference of said cylinder lock. In the locking position, said tumbler engages behind a cooperating locking shoulder which is located on an annular body inserted into an axial chamber of said polygonal head and locked in position thereto.

Abstract: A lockable rotary attachment device including an axially threaded attachment member having an externally splined drive head and a flange defining oppositely facing annular shoulders, and a knob mounted for axial translation on the attachment member between first and second axial positions on the attachment member. The knob is freely rotatable relative to the attachment member in the first axial position and has an internally splined socket for non-rotatably receiving the drive head when in the second axial position. A lock is mounted on the knob for moving a latch member between a first latch position in which it is disposed outwardly of the flange on the attachment member to allow axial translation of the knob between the first and second axial positions, and a second latch position disposed radially inwardly of the flange for engagement with the first shoulder when the knob is in its first axial position and for engagement with the second shoulder when the knob is in its second axial position.

Abstract: A removable hose protector to prevent the unauthorized removal of a hose from a faucet assembly wherein one embodiment of the invention consists of an elongate cylinder comprised of a pair of cylinder halves having top and bottom retaining lips and pair of overlapping locking tabs for the removable insertion of an ordinary padlock therein.

Abstract: A locking device for parking brakes of trucks using an internally grooved knob on the instrument panel to control air brakes. A sleeve covers the knob and is locked to the knob to prevent pushing on the knob and removing it from the knob. The sleeve is provided with a lock plug for engaging the groove in the knob.

Abstract: A lock unit of a roof carrier of a vehicle which includes a crossbar for placing an object to be carried thereon, a plurality of stands for supporting the crossbar on a vehicle roof, and a rotatable knob mounted on at least one of the stands, for fixing the stands at given positions, on the roof of the vehicle, wherein the knobs include a lock member for preventing rotation of the knobs, the locking member including a cam member, and wherein the knob includes a bottom plate, a rotating member mounted on the plate, a pin member, and a biasing member positioned between the rotating member and the cam member for biasing the pin member into engagement with the cam member.

Abstract: A device for use with a wheel lug nut having a frustoconical exterior surface includes a sleeve-like body adapted to be loosely fitted about the exterior surface of the lug nut so as to substantially cover the exterior surface thereof. The sleeve-like body defines two opposite inner and outer ends and concentrially-arranged, frustoconically-shaped interior and exterior surfaces extending between the inner and outer ends. When operatively positioned about a wheel lug nut used to secure a wheel rim upon a lug stud of a wheel, the sleeve-like body is retained upon the lug nut between the wheel rim and the frustoconical configuration of the lug nut and prevents the lug nut from being tightened or loosened by a tool such as a pipe wrench, operatively clasped about the exterior surface of the sleeve-like body.

Abstract: A center locking device of intermediary plate type for a disc wheel of motor vehicle. The device has a cap nut screwed onto a threaded section of a flange fixed to the axle of the disc wheel. The disc wheel is clamped between the cap nut and the flange. A locking device is provided to lock the cap nut to the threaded section of the flange for preventing the disc wheel from becoming loose and/or theft of the disc wheel.

Abstract: The anti-theft trailer assembly includes a trailer body, a cab connector in the form of a hitch post depending from the front portion of the trailer and having a generally central annular recess therein, and a lock releasably secured in the annular recess. The lock has a lock body with two generally U-shaped halves, each with a pair of spaced arms, one set having depending posts releasably secured in the other set of arms. The lock halves define a central transverse opening which receives the recessed portion of the hitch post, rendering it unusuable by filling it and slightly bulging from it. The lock cannot be pried out from the recess. The locking mechanism includes a locking plate, the ends of which fit into opposed notches of the lock posts, and a key lock component fixedly secured to the plate and rotatable by a key to move the plate out of the notches to unlock the halves against the biasing force of a spring bearing against the plate. The lock is simple, durable and efficient.

Abstract: The present invention is directed to a locking device to frustrate unauthorized removal of stereo systems and like assemblies from automobiles or trucks. The device includes a frusto-conically shaped housing with a rotation prevention mechanism fastened therein. A plurality of spaced nubs function to prevent removal of the locking device from the threaded shaft of the electronics unit without a tool having the proper combination of mating openings to receive the nubs.

Abstract: A generally cylindrical shaft having a first internal bore for receiving, at least in part, a portion of a protected item, a second internal bore communicating with the first internal bore and adapted to receive, at least in part, a portion of the protected item, and a third internal bore communicating with the second bore and adapted to receive a lock, said third bore being further provided with a hexagonal port; anda generally cylindrical sleeve having a first internal bore of a diameter slightly greater than the outer diameter of the shaft, and a second internal bore adapted to receive a collar attached to one end of the shaft, said sleeve being adapted to receive the shaft and the collar in rotational relationship within the internal bores.

Abstract: A lock and coupling apparatus for securing fire hydrants is disclosed. The two piece apparatus comprises an inner member concentrically received within an outer cylindrical member. The inner member is formed with a socket for receiving the five sided hydrant valve post. A snap ring connects the outer member to the inner member while permitting rotational movement therebetween. A square lock pin moveable between locked and unlocked positions is provided to lock the inner and outer members so that rotational movement of the outer member is transmitted to the inner member. A specifically designed wrench for imparting rotary movement to the outer member is also disclosed.

Abstract: A fill pipe lock assembly for protecting the fill pipe cap of an underground flammable liquid storage tank is disclosed. The lock assembly includes a floating baseplate inserted over the top of the fill pipe and below the adaptor ring and a removable cover. The baseplate is in loose engagement about the fill pipe in a manner which permits the baseplate to be rotated freely about the fill pipe. The baseplate and cover include a pair of cooperating, diametrically opposed, hasps and openings to removably lock the cover to the floating baseplate.

Abstract: Two caps are axially nested so that a smaller inner threaded cap is free to rotate within the outer larger protective cap and retained therein to form a security lock cap unit for gas supply tanks. It includes a locking means associated with the outer cap whereby the inner cap can be selectively engaged by the locking means to prevent its relative rotation, allowing the inner cap to be screwed on to a gas supply tank by rotating the outer protective cap and thereafter the inner cap is released by the locking means and retained in a disengaged position to prevent removal of the locking cap unit without a key to the locking means.

Abstract: Apparatus for locking elements together is disclosed which comprises socket means defining a first axis, knob means, and fastener means for attaching the knob means to the socket means. The fastener means has first and second ends and a middle portion, the first end including means for affixing said fastener means coaxially with, and in, the socket means; the second end including a smooth bearing portion; and the middle portion including a head portion, having faces, positioned beneath the bearing portion. The knob means houses lock means therein and is rotatable on the fastener bearing portion.

Abstract: The present invention comprises a lug nut which has two separable portions connected by a frangible neck, wherein a first portion engages the threads of the stud, and a second portion provides a surface adapted to engage a wrench so that the lug nut may be driven into the stud. When the stud-engaging first portion has been threaded onto the stud and sufficiently tightened, continued application of torque cause the frangible, wrench-engaging second portion to shear off from the stud-engaging first portion. The stud engaging portion has an annular notch which is adapted to engage a snap ring located in the wrench-engaging portion. After the wrench-engaging portion is severed from the stud-engaging portion, the wrench-engaging portion is then reversed and positioned onto the stud-engaging portion. When so positioned, the snap ring engages the notch, which rotatably secures the wrench-engaging portion to the stud engaging portion.

Abstract: Anti-theft device for nuts/screws of automobile wheels, comprising a barrel (10) rotatably subassembled with a lock cylinder plug (18) the tumblers (24) of which are placed in position by simple insertion of the key (23), which key, however, once inserted and turned, cannot be withdrawn inasmuch as a projection (28) on the key (23) then lies behind a shoulder (20) on the barrel. This subassembly may be rotatably locked upon the fastener element or removed therefrom using but one hand.

Abstract: A shield is rotatably mounted to a threaded element of the closure on an axis coincident with the axis of the threaded element, so that the shield impedes access to the threaded element. The shield can be removed from the threaded element or connected to the threaded element only upon actuation of the closure by an appropriate key. Absent such actuation, the threaded element cannot be rotated for disengagement from the conduit by rotating the shield. The closure is protected against attempts to disengage it from the conduit by bonding the shield to the threaded element with an adhesive and rotating the shield.

Abstract: A tamper proof lug nut or bolt lock assembly includes a substantially cylindrical portion on which is rotatably mounted a sleeve having a hex portion for receiving a wrench and a selective coupling assembly disposed within the sleeve for selectively coupling and uncoupling the sleeve to the nut or bolt assembly by means of a key of a predetermined configuration.

Abstract: The invention relates to fastening means of the known kind comprising a nut or bolthead and a spanner component, the nut or bolthead having a smooth edge surface and the spanner component having locating pins adapted to engage in cooperating bores in the nut or bolthead to rotate the nut or bolthead with the spanner component. Said fastening means are improved by providing (a) a sleeve which rotatably covers at least part of said edge surface and/or (b) an axial projection, preferably on the nut or bolthead, which is received as a rotatable fit in a recess, preferably in the spanner component, to restrict lateral movement between the nut or bolthead and the spanner component.

Abstract: A door lock system for the rear doors of the trailer of a tractor-trailer rig is disclosed. The lock system includes a locking bar fixedly secured to one door and attachably secured to a second door. A pin projects from the second door so that it may pass through an opening in the locking bar. A pin cover locks over the pin for securing the bar to the second door. In a preferred embodiment the pin is formed identical to a conventional trailer king pin or coupling pin so that the pin cover may be used either to lock the trailer doors or as a theft prevention device covering the king pin to prevent unauthorized coupling of unattended trailers.

Abstract: The invention consists of a screw cap assembly including a manually operable handle piece rotatable in both directions, a cylindrical case mechanically coupled with the handle piece for unitary rotation therewith, a key-operable cylinder lock mounted in the cylindrical case and capable of rotating only partially and independently therefrom when key-operated from outside, and a screw plug proper operably connected with the handle piece through the cylindrical case. The plug can be rotated in both screw-advancing and screw-retracting directions when the cylinder lock is key-operated to its unlocked position but only in the screw-advancing direction when the lock is in its locked position.

Abstract: A tamper-proof nut assembly for interlocking together the separable parts of a mounting support for a meter for monitoring the flow of liquid from a storage supply thereof to prevent separation of the meter from its support so that it is rendered inoperative to record and register the amount of liquid passing through the supply or delivery line with which the meter is associated, the nut assembly including an elongated tubular member having axially alined integrally formed first and second parts each externally fitted with a revoluble sleeve, one of said parts being adapted for threaded engagement with a bolt for locking together the separable parts of the meter support and the other of said parts being of a polygonal external shape for application of a tightening wrench thereto, the revoluble sleeve which encases the polygonal part of the nut member being removably held in place by a key-actuated tumbler cylinder fitted in the bore of said polygonal part of the nut member.