Abstract: An anti-theft bracket for interactively displaying electronic gadgets. An electronic sensor is attached to the back of the gadget. An annular base surmounts the sensor. A circumferential channel is disposed on a lateral surface of the annular base. At least one arm is slidingly received within the circumferential channel, whereby the arm can move radially about the annular base. A clamp is in sliding communication with the arm forming an arm-clamp assembly. The overall length of the assembly is adjustable by sliding the clamp along the arm. A clamping member is attached to the clamp. A corner of the gadget is received within the space between the clamping member and the clamp, thereby securing the gadget within anti-theft device. The distance between the clamping member and the clamp may be adjustable to accommodate the thickness of the gadget.

Abstract: A device includes an actuating device, and the actuating device includes: a locking device having a lock; an actuating member which pivots about an axis of rotation to move a movable furniture part; and a spring device which biases the actuating member to pivot about the axis of rotation in an opening direction. The lock is lockable by a key for preventing the actuating member from pivoting about the axis of rotation, and the lock is unlockable by the key for enabling the actuating member from pivoting about the axis of rotation.

Abstract: The invention relates to a steering lock with a deadlock for a motor vehicle comprising: •a bolt guide (5), •a bolt (4), •a deadlocking means (15) comprising a locking element (16) designed to lock the bolt (4) in deadlocked position and to be subjected to torsional and translational movement towards said bolt (4), said element (16) being received in a housing (18) of the bolt guide (5). The deadlocking means (15) further comprises a closing plate (10) having a face that engages with an element of the deadlocking means (15), and engages with the opening of the housing (18) in such a way that the rotation of the closing plate (10) is locked relative to the guide bolt (5) and causes the translational and torsional movement of said locking element (16).

Abstract: A lockout device includes a first member having a first lockout feature and at least a first aperture, and a second member including a second lockout feature and at least a second aperture. The second member is assembled with the first member and is slideable along a range of positions between first and second limit positions of the second member with respect to the first member. The range of positions includes a first lockout position in which the first and second lockout features are positioned to interlock with a first external structure, and a release position in which the first and second lockout features are positioned to disengage from the first external structure.

Abstract: The present invention, and inventive system, describes a locking system that reinforces an existing cover or tubular. In many embodiments of the present invention, the present invention reinforces an existing recessed cover by preventing the cover of a tubular or ring from being easily removed, or rotates by unauthorized persons and prevents any unauthorized personnel from accessing a locked down tubular. In one embodiment of the present invention, the inventive system is designed to maximize the overall strength of the locking unit for recessed covers or tubulars by using applied force on both the recessed cover and the circumference, curves, or straight, edge of the recessed unit or tubular interior.

Abstract: A safety lockout hasp for interaction with equipment, infrastructure, machinery, appliances, tools, implements and the like. The hasp comprising a body, a cable for engaging the plant and a movable member being movable relative to the body between an open condition and a closed condition. The movable member interacting with the cable such that in the closed condition an intermediate portion of the cable is secured in its position relative to the body. The movable member also interacts with the body such that in use in the closed condition the hasp can accommodate a plurality of locking elements so that the hasp is prevented from disengagement from the plant when accommodating at least one of the plurality of locking elements, and when the movable member is in the open condition the hasp is prevented from accommodating any of the locking elements.

Abstract: A latch-locking device for an electric vehicle charging connector having a movable latching element for engaging a matching latching element on a charging station, or on an electric vehicle. The latch-locking device includes a movable latch-locking element mounted adjacent the matching latching element on the charging station or an electric vehicle for movement, in a direction transverse to the direction of movement of the movable latching element, between a retracted position spaced away from the matching latching element and an advanced position where the latch-locking element overlaps at least a portion of the movable latching element when the movable latching element is engaged with the matching latching element. An actuator is coupled to the latch-locking element for moving the locking element between the retracted and advanced positions.

Abstract: A lock for locking adjacent spools that have parallel, non-collinear adjacent axes of rotation has first and second locking plates with spool-engaging surfaces. A locking member connects the locking plates. The locking member is connected to an intermediate position on each of the first and second locking plates. The locking member has a release position and a locking position. In the locking position, the spool-engaging surfaces clamp against adjacent spools.

Abstract: A security device protects the vulnerable portions or accessories of a bulk storage tank or container against unauthorized access. The device includes a housing that covers the vulnerable portions of the tank, the housing having two or more lockable doors that selectively permit access to the tank or container via two or more respective apertures. A first door is openable after unlocking a readily-accessible lock, while the second movable door is openable after an elongate lock member that is positioned internally within the housing is moved to an unlocking position. The elongate lock member can be moved to its unlocking position after the first door is opened. Certain tank operations, such as dispensing fuel, may be carried out after unlocking and opening a single door, while other operations, such as refilling the tank, may be accomplished after opening a second door once the first door has been opened.

Abstract: A hydrant locking device inhibiting unauthorized operation of a fire hydrant and includes a flip-top lid positioning between an open configuration and a closed configuration relative to a base. The flip-top lid is hingedly connected to the base of the locking device. The base may be releasably secured to an operating nut of the fire hydrant or more specifically an operating nut extension that engages the operating nut of the fire hydrant. The flip-top lid may also include a sealed cavity that may include electronics. These electronics may be in electrical communication with a wireless mesh network.

Abstract: The present invention relates to an anti-theft system for a camper. The camper is supported at its front end by a pair of spaced-apart jacks. The system includes a barrier having a first end operatively connecting to a first one of the jacks and a second end opposite thereof. The second end of the barrier operatively connects to a second one of the jacks. The barrier extends in a horizontal direction and is positioned and configured to prevent an unauthorized vehicle from passing underneath the camper and mounting of the camper onto the vehicle.

Abstract: The present invention relates to an anti-tamper cam system 2 used to selectively operate a safety interlock switch 6. The cam system 2 comprising a cam 12 selectively rotatable between two positions in order to activate the switch 6. The cam 12 has a locking system 20, 22; 32a, 32b to lock the cam 12 in one of its positions. The locking system 20, 22; 32a, 32b comprises a separate mechanical locks 20, 22; 32a, 32b on each side of the cam 12, each of which must be unlocked using a dedicated key actuator 8 before the cam 12 can be rotated to its other position.

Abstract: A safety system comprising a work area having a perimeter and hazardous automated machinery within the perimeter, wherein access by workers to the work area within the perimeter is controlled by one or more controlled access points; at least one safety work cell within the perimeter, each safety work cell having no hazardous automated machinery within or accessible from the safety work cell; a primary key-secondary key system which includes a tertiary key receptacle within the safety work cell; an optional light barrier surrounding each safety work cell; optional fingerprint scanners to authenticate authorized persons, and a controller programmed to permit operation of the hazardous automated machinery only when all controlled access points are closed, all secondary keys are placed within either a secondary key receptacle or a tertiary key receptacle, any light barrier has not been tripped by interruption of the light barrier, and any fingerprint scanners have authenticated a person.

Abstract: A lockout device for a component extending from a component supporting structure includes a base member and a shell member. The base member defines an aperture sized to receive the component therethrough, and includes an outer flange portion that extends from the base member. The shell member includes first and second body members configured to be secured together with the base member in a first condition to block access to the component, and movable to a second condition to allow access to the component. At least one of the first and second body members includes an interlock portion received in an outer peripheral recess defined between the flange portion and a surface of one of the base member and the component supporting structure. The first and second members define a clasp portion configured to receive a locking component to secure the first and second body members in the first condition.

Abstract: This invention relates to a coupling plug lock assembly 2 for controlling access to a coupling plug 1. The lock assembly 2 includes a housing 9 for receiving the plug 1, an actuator 10 moveable between a latch position and a release position, and a lock means 17 for locking the actuator in the latch position. The lock assembly 2 is intended for obstructing access to the plug 1 for discouraging unauthorised access to the plug 1.

Abstract: A locking device comprising a safety lock switch unit for adjacently located the motor switch. The safety lock switch unit has a lock part and a piece of the action element therewith a control end extended to the motor switch. The locking device can control the handle of the motor switch cannot move.

Abstract: A safety switch for generating a system enable signal depending on the position of a movable guard door which is used for safeguarding a hazardous area of a machine installation. At least one part of the machine installation can only be operated when the system enable signal is present. The safety switch has a door part to be fastened to the movable guard door and a frame part to be fastened to a mating door piece. The safety switch also has a bolt which can be moved between a first position and a second position, a recess in which the bolt can engage in the second position, and a locking element designed to block the bolt in the second position. In addition, the safety switch comprises a first position sensor designed to clearly detect at least one of the positions of the bolt in order to generate the system enable signal. Moreover, the safety switch comprises a door release request unit configured to generate a door release request signal in addition to the system enable signal.

Abstract: A electrically operated blocking device used to block the operation of electrical or mechanical equipment without using a system of deadbolt locks, keys, and electrically operated key traps. The electrically operated blocking device preferably includes a blocking shaft used to block the operation of electrical equipment such as, e.g., switches, circuit breakers and other similar electrical equipment, or mechanical equipment such as, e.g., valves, cams, gears, doors or any moving device or device operator, and preferably includes a keyless solenoid release unit (KSRU) used to control a plunger that locks the blocking shaft into place and unlocks the blocking shaft to allow the blocking shaft to move freely along its axis.

Abstract: The invention relates to an actuator having at least one actuating member for moving a movable furniture part and having a locking device for inhibiting a movement of the actuating member, wherein the locking device has a lock which is disposed in or on the actuator and can be unlocked by a key so as to release the movement of the actuating member.

Abstract: A security device protects the vulnerable portions or accessories of a bulk storage tank or container against unauthorized access. The device includes a housing that covers the vulnerable portions of the tank, the housing having two or more lockable doors that selectively permit access to the tank or container via two or more respective apertures. A first door is openable after unlocking a readily-accessible lock, while the second movable door is openable after an elongate lock member that is positioned internally within the housing is moved to an unlocking position. The elongate lock member can be moved to its unlocking position after the first door is opened. Certain tank operations, such as dispensing fuel, may be carried out after unlocking and opening a single door, while other operations, such as refilling the tank, may be accomplished after opening a second door once the first door has been opened.

Abstract: An anti-theft device for preventing theft of a boat fitted with an outboard motor. The anti-theft device is made up of a rear collar and a front collar. In one embodiment the rear collar comprises an elongated bracket having a U-shaped cross-section defined by first and second opposite sidewalls with a joining curved portion there-between. A nut cover is integral with and located at one end of the front collar. Complimentary locking teeth and locking teeth receiving apertures allow a user to affix the front and rear collars around an outboard motor's steering piston. Each of the front and rear collars are provided with locking tongues. In typical use a shackle is threaded through the locking tongues and attached to a padlock to secure the anti-theft device to the steering piston.

Abstract: An extended safety cage provides access to a plurality of hatches on the top of a mobile container. The cage is rotatably attached to the end of a gangway, which extends from and is rotatably attached to a platform. The platform carries a pair of braces that extend out in opposite directions and support the cage through spring-loaded lifting arms. The apparatus can include actuators, such as hydraulic or pneumatic actuators, that urge the gangway and cage downward when activated. Secondary braces ensure that the lifting arms and safety cage move in unison.

Abstract: A computer docking station is provided for supporting and electrically coupling to a portable computer that includes a docking connector and an aperture at least partly defining a carrying handle for the computer. The docking station includes a body with a cradle portion configured to support a portion of the computer and having a connector operable to electrically couple with the docking connector of the computer. The body further includes an arm portion sized and configured to be received in the aperture in the computer. A latching member is coupled with the arm portion and is movable between a first position relative to the arm portion, in which the arm portion can be inserted into or removed from the aperture in the portable computer, and a second position relative to the arm portion, in which the arm portion cannot be removed from the aperture in the portable computer.

Abstract: An apparatus and method for locking a composite component such as blade or vane of a turbine engine is disclosed herein. The disclosed lock can also be used generally to fix the position of composite structures. The lock includes a first locking member including a first structure operable to at least partially fix the first locking member along an axis of a slot for receiving a blade or a vane. The lock also includes a second locking member including a second structure operable to engage the blade or vane. The first and second locking members are slidably engaged with one another along mating ramped surfaces.

Abstract: The disclosed devices use shape memory materials, and specifically shape memory polymers and composites to allow or disallow mechanical or physical movement. By positioning the shape memory polymer so it is near the mechanical device which is to be moved, the shape memory polymer will allow or disallow the motion of the mechanical device depending on the state the shape memory polymer is in. When the shape memory polymer is in its hard rigid state the device cannot move. Once activated the shape memory polymer will become soft and pliable, whereupon with sufficient force the mechanical device can be moved to a new position. Once in this new position the SMP can either remain in its relaxed state, the SMP can return to a hard rigid state and maintain its deformed shape, or the SMP can return to its original shape to ensure the device does not move.

Abstract: An outboard motor lock assembly (10) has a longitudinally extending base (20) having a longitudinally-extending slot (28) defined within the base (20). The base (20) is functionally adapted to overlay the lever-like head portions (8) of the clamping screws (18) that are used with the motor supports (6), when the head portions (8) are aligned in a co-linear fashion. In that position, the base (20) slides over the lever-like head portions (8) via the slot (28), one end (26) of the slot (28) being open and the opposite end of the slot (28) being closed to allow for this movement. A transversely disposed lock cylinder (45) is slidingly attached to the base (20) at the open end (26) of the slot (28). The lock cylinder (45) includes a latch (44) that is engageable with a latch “keeper” (35) that is also situated at the open end (26) of the slot (28).

Abstract: A trolling motor lock assembly (10) has base member (40) that is attached via a hinge (70) to a cover member (20). The base member (40) and the cover member (20), when rotated such that the cover member (20) engages the base member (40), overlay the head portion (8) of the clamping screws (18) of the motor support (6) of the trolling motor (4) preventing rotation of them. The base member (40) and the cover member (20) have cooperating cut-outs (31, 33, 35, 51, 53, 55) adjacent side-walls (25, 45) that allow the shaft of the clamping screws (18) to protrude through the cut-outs (31, 33, 35, 51, 53, 55). In that way, the base member (40) and the cover member (20) may be “clamped” down over the head portions (8) of the clamping screws (18).

Abstract: An open/close control system for an inspection lid adapted not to open while a vehicle travels. The open/close control system has emergency release means which disables power transmission of drive means for opening and closing a side entrance/exit door of a railway vehicle. The emergency release means is installed in a space inside a wall surface inside the vehicle, and the space can be opened and closed by the inspection lid. The emergency release means has locking devices provided in the space inside the wall surface in order to restrict rotation of the inspection lid, and also has an open/close controller for detecting traveling of the railway vehicle to actuate the locking device.

Abstract: A tool carrier assembly (100) comprising a main body (101), a quick hitch (102), and a rotatable locking device (103) between the quick hitch and the main body. The rotatable locking device employs releasable locking means (104,105) at opposite ends. A scroll plate (106), cylinder (107) and piston (108) which upon assembly is located inside the cylinder) are located between the releasable locking means (104,105). In normal operation the piston (108) is driven back and forth to tilt the hitch by reason of rotation of the cylinder as guide (109) travels in the helical guide way (110) of the scroll plate (106). The hitch is fixed to the cylinder and the main body is fixed to the scroll plate. The releaseable locking means (104) and (105) each comprise an internally tapered end cup (111), bearing (112), an unlock piston (113), a locking element (114) and a locking spring (115).

Abstract: An exercise device including at least one positionable component configured to be positioned by a user. The exercise device includes a frame to which a collar is mounted. The positionable component includes a member that is slidably received within the collar and may be positioned by sliding the member to a selected position. A locking assembly is coupled to the collar and is operable to lock the member in a selected position within the collar, to release the member from the locked position, and when released, to allow the member to slide within the collar. The locking assembly includes a cam pivotably mounted to the collar and a cam follower assembly selectively biased by the cam against a portion of the member disposed inside the collar. The locking assembly also includes a pair of engagement members disposed inside the collar opposite the cam against which the cam biases the member.

Abstract: A storage system comprises a support assembly, a shelf assembly supported by the support assembly, and a drive system controllable by a user to raise and lower the shelf assembly. The shelf assembly includes a storage platform and panels that are removable from the storage platform. In some embodiments, the size of the storage platform is adjustable. In some embodiments, a single-point locking system is employed that includes a cam for engaging a sliding carriage that moves as the platform rises and lowers. A cam spring urges the cam towards a locking position, where the cam prevents the sliding carriage from moving in a platform-lowering direction.

Abstract: An integrated locking assembly that includes a linear locking mechanism and a rotary locking mechanism. The linear locking mechanism employs opposing locking plates having aligned bores that can lock onto a rod extending through the bores. The rotary locking mechanism includes rollers positioned between a housing and a cam where the rollers are wedged between the housing and the cam to lock the rotary locking mechanism and are positioned in an open position between the housing and the cam to unlock the rotary locking mechanism. The rotary locking mechanism includes T-shaped driving lugs each including a key portion that is slidably engaged in a slot in the cam and a driving portion having a flange that is positioned within an indented neck portion of the rollers when the rotary locking mechanism is in the locked position.

Abstract: An actuator suitable for a washing machine lid lock employs a shape memory alloy wire indirectly heated by a temperature regulating heater that provides a sliding coupling to the wire and that may be driven, for example, directly by line voltage without the need for temperature regulation circuitry.

Abstract: Various embodiments of this invention is an easy-to-use one-piece air brake securing device designed for use in recreational vehicles, trucks, and other automotive vehicles employing air-operated parking brakes. The device is designed to fit around the shaft of the air brake plunger and to prevent the plunger from being moved intentionally or inadvertently in a manner that may disengage the air brake.

Abstract: A locking clamp device is provided with first and second clamping members. The first clamping member includes a base member with a first clamping surface and a locking member movable with respect to the base member between a securing position and a releasing position. The second clamping member is slidably engaged with the first clamping member and selectively movable to a plurality of clamping positions. The second clamping member includes a second clamping surface opposite the first clamping surface. The lockout device further includes a means for preventing movement of the locking member from the securing position to the releasing position. The locking member is configured to secure the second clamping member in one of the plurality of clamping positions when the locking member is in the securing position.

Abstract: An anti-theft device for a machine-operated implements includes an adjustable shaft and a locking mechanism. The adjustable shaft includes at least a first adjustable member having a first end portion and a second adjustable member having a substantially perpendicular bar portion located a sufficient distance from an exposed end of the second adjustable member. The anti-theft device is placed on a machine-operated implement to prevent attachment of an earth mover thereto and subsequent theft.

Abstract: A locking apparatus with a locking system housing is provided. The locking system housing includes at least one sliding pad and a locking pad with at least one locking groove. The at least one sliding pad and the locking pad are arranged in such a manner that they may be displaced by at least or counter to at least a first spring.

Abstract: A rotating machine includes a stationary component, a rotating component that is moveable relative to the stationary component, and a balancing member detachably mounted to the rotating component. The balancing member includes a self-locking device that selectively engages the rotating component when in a locked position and disengages the rotating component, to permit removal of the balancing member, when in an unlocked position. In this manner, the self-locking device prevents the balancing component from becoming loose during operation of the rotating machine without requiring staking the balancing component to the rotating component.

Abstract: The invention relates to a protective hood anti-rotation lock for a portable power tool (12a-k), especially for an angle grinder, for providing anti-rotational locking between the portable power tool (12a-k) and a protective hood unit (14a-k). According to the invention, the protective hood anti-rotation lock has a form-fit unit (16a-k) which is provided for anti-rotational locking of the protective hood unit (14a-k) in relation to the portable power tool (12a-k) in the event of a tool (18a-k) breakage.

Abstract: An ice cream scooping implement includes an elongated handle that has an axial bore extending from a handle distal end and terminates approximately midway therealong. The handle has an end cap removably mated to a proximal end thereof. A scooping section is telescopically and removably insertable into the axial bore and includes a mechanism for locking the scooping section within the handle. A heating element is concentrically seated about a proximal portion of the scooping section, is in direct contact with the scooping section, is isolated from the handle, and is formed from thermal-conductive and electrical-conductive material, including tungsten. The heating element includes a pair of conductive terminals that extend proximally along a longitudinal length thereof. A mechanism is included for supplying power to the heating element. The terminals are directly engaged with the power supplying mechanism.

Abstract: A circuit for driving an appliance for treating laundry, includes a motor circuit having an AC motor, and a door-locking circuit. The motor circuit and the door-locking circuit may be driven by a single common electronic switching element.

Abstract: An anti-theft device including a shaft divided into first and second brackets and a locking mechanism. First bracket defines first 300a and second 320a edges, second bracket defines first 300b and second 320b edges. First 320a and second 320b edges are hingedly connected such that first and second brackets can be opened or closed. Edge 300b includes at least one inner-flange and a locking tab. First bracket 260a includes sidewall 340a. Locking tab and sidewall 340a respectively define apertures 440 and 390. Apertures 440 and 390 are aligned upon closing the first and second brackets. When the first and second brackets are in a closed configuration, the locking mechanism is in operable communication with apertures 440 and 390 such that the locking mechanism is capable of reversibly locking first and second brackets together, and wherein the at least one inner flange prevents illicit tampering of the locking mechanism.

Abstract: A system for restricting access to wellhead equipment is provided. A cable may be snugly wrapped around or threaded through wellhead equipment and secured with a cable restraint to prevent loosening of the cable from the equipment. Other devices are also provided within the system, the devices for covering ports or shielding equipment to prevent unauthorized access to the ports and/or equipment. Such devices may also be secured with the cable and restraint system. A method and kit for securing wellhead equipment are also provided.

Abstract: An alarm system that indicates to an operator the status of locking pins of a vehicle sliding axle assembly. The alarm system includes an alarm valve coupled to the locking pins and in fluid communication with an alarm. When the pins are unlocked from a vehicle component, the alarm valve is configured in an alarm mode to indicate the unsecured condition of the assembly. In this mode, air is diverted from the vehicle brakes to sound the alarm, thereby informing an operator that the pins are improperly engaged. In one embodiment, the alarm valve is in communication with or includes a pressure relief valve, which diverts a sufficient amount of air from the vehicle brakes so that the brakes cannot be released. When the pins are properly locked to secure the slider axle assembly, the alarm valve does not divert air from the brakes to sound the alarm.

Abstract: A device for preventing the inadvertent rotation of a temperature selection dial associated with the temperature controller of a water heater. The device includes a spring-loaded prong that extends across the face of a rotatable dial so as to prevent rotation of thereof. The force required to pry the prong off of the dial is selected to be greater than what a small child is typically capable of exerting.

Abstract: A keyed knob assembly (10) having a knob portion (12), a knob insert (14) partially received within a bore (18) formed in the knob portion (12) and a shank portion (16) partially covering the knob insert (14) is disclosed. A throughbore (48) formed in the knob insert (14) is provided which operably supports a locking cylinder assembly (42). An axial channel (50) formed in the shank portion (16) terminates at a radial slot (52) to provide a means for releasably coupling the knob,assembly (10) of the present invention to a catch (54) of a lever catch subassembly associate with the chassis of the lockset.

Abstract: A anti-theft device for removably placing around the cylinder of a stabilizer leg of heavy machinery such that the cylinder may not be retracted. The anti-theft device includes a shaft. The shaft is elongate and has a first and second end. The shaft is hollow such that the shaft has an inner surface and an outer surface. Each of the first and second ends is open. The shaft is divided into two substantially equal portions along a line orientated generally parallel to a longitudinal axis of the shaft. Each of the portions has a pair of free edges. A first free edge of a first portion is hingedly coupled to a first free edge of the second portion such that the second free edges are abuttable. A closed position is defined by the second free edges being abutted. A latching means coupled to the shaft removably latches the first portion to the second portion in the closed position.

Abstract: A aircraft anti-theft device for immobilizing the yoke of an aircraft. The aircraft anti-theft device includes a device for immobilizing the yoke control of an aircraft. The yoke control has a gust lock hole for holding the yoke in a stationary position. The device has a sleeve for wrapping about the yoke control. The sleeve has an interior channel for receiving a portion of the yoke control. The sleeve is divided along its longitudinal axis to form a first and second sections. The first and second sections each have a pair of end edges, a first side edge, and a second side edge. A lock locks the first and second sections in a closed position. A pin for insertion into the gust lock is fixedly coupled to an interior surface of the first section of the sleeve. The pin protrudes from the interior surface of the sleeve. The first and second sections are placed around the yoke control such that the pin enters the gust lock.

Abstract: For a door or protective hood locking control system of a safety device with normal or excessive safety for machines, particularly machines carrying out rotational motions, a stoppage monitoring guard is disposed in the current circuit for the door locking mechanism that is operated by push-buttons. This stoppage monitoring guard is taken from a redundant, rotational motion signal evaluating system of the target installation of a rotational motion monitoring device, which is already present, and operates redundantly to monitor each axle with two rotational motion sensors so that a dedicated rotational motion sensing system can be dispensed with for the redundant operation of the door locking system.

Abstract: A pyrometer has a lock nut that engages a threaded sighting tube. The lock nut has a flange with a circle of thirteen apertures. A second similar flange is mounted on the body of the pyrometer which is restrained from rotation by splines which engage splines in the sighting tube. The second flange has a circle of only twelve apertures which is concentric with the circle of apertures on the first flange. The two flanges are locked together and the pyrometer is thereby locked in the sighting tube by means of a split pin pushed through aligned apertures. The different number of apertures in the flanges gives a number of locking positions that exceeds the number of apertures.