Abstract: A locking device for preventing an end plug on an equipment from being connected to a source of current or preventing equipment theft. The device is a small, rigid plastic body that includes a receptacle to plug in either a three-pronged or two pronged plug, and includes internal means to engage and secure the plug prongs by using a floating pin that engages a hole in the prong tips. The device is locked by passing a cable, shaft or a padlock shackle through a passage in it, and may be secured by locking the cable, shaft or padlock shackle to a post. A multiple number of devices may be secured using one cable.

Abstract: A control pod for a plug and cord assembly secures the electrical appliance to which the cord is attached and prevents insertion of the plug into a power outlet by having an upper section connected to a lower section by a hinge on one side and a lock oppositely disposed from the hinge.

Abstract: An electrical plug locking device that prevents the unauthorized use of electrical devices. The locking device employs an innovative key actuated cam and cam slide locking mechanism to securely engage the prongs of an electrical plug. The locking device is strong, durable, and tamper resistant.

Abstract: An electrical-cord lock has a plug container (1) that is sized and shaped to receive an electrical-cord plug (2) laterally. The plug container has first and second ends (3, 4) that are closed and a closure wall (5) that is operable and closeable with a wall positioner such as a tongue-and-grooved slideway (8, 9). The first end of the plug container has a cord bay (6) that is sized and shaped to receive an electrical cord (7) laterally and to prevent passage of the cord plug through the cord bay. The wall positioner positions the closure wall selectively to open and to close the cord bay and the plug container. A closure lock (12, 18) locks the closure wall in closed position at an entrance to the cord bay and at an entrance to the plug container, such that the cord plug can be locked into and unlocked from the plug container with the closure lock on the closure wall.

Abstract: A lock-out device for electrical cables and associated plugs that is intended to allow the workman to protect against the possibility of a re-connection of any plug in the device, while the workman is working on the electrical apparatus associated with such plug. The lock-out device is comprised essentially of a flexible containment chamber, a keeper bar, a perforated strap, a fastener for the strap, a locking device for the keeper bar, and a pocket, which has two openings.

Abstract: A plug lock (10) functioning to securely lock a plug (16). The plug lock (10) having a a lock base (12) and a U-member (14). The U-member first shaft (14A) is slidably insertable into the lock base first opening (12BA). The U-member second shaft (14B) is slidably insertable into the lock base second opening (12BB). The U-member first shaft (14A) further comprises a U-member tab (14D) extending therefrom. The U-member tab (14D) comprises an U-member tab first member (14DA) securely connected at a front distal end at a perpendicular angle to a top distal end of an U-member tab cross member (14DC) which is securely connected at a bottom distal end to the U-member first shaft (14A).

Abstract: This invention relates generally to the field of devices designed to prevent the use of electrical equipment or appliances by securing the electrical plug. More specifically this invention relates to a device which will captivately surround the blades of the electrical plug in such a manner that young children, elderly persons, or mentally retarded persons cannnot gain access to their use, and which incorporates a clamping mechanism which can be actuated without the use of any external apparatus, such as a key or a tool.

Abstract: A plug lock for locking electric plugs is disclosed. The device comprises a case having a shaft. The shaft has a pair of inverted U-shaped cut portions that pivot outwardly. A lock gear is rotatably disposed within the shaft and engages the cut portions pushing them outwardly. A block cap is slidably disposed on the shaft. In its extended position, the block cap blocks the electric prongs' access to an electric socket. In this position, the lock gear is rotated so that the cut portions extend outwardly, preventing the lowering of the block cap. Lock drive means control rotation of the lock gear.

Abstract: The present electrical plug lock out apparatus comprises two matable, close-ended lids; a first female threaded lid and a second male threaded lid. Each lid has a flange or brim around the circumference of the lid which is integral with the lid. The flange or brim on each lid has an allignable hole for accepting a conventional pad lock or similar device. The male threaded lid has a plurality of elongated "U" shaped slots running through the threaded wall of the lid to a point approximately midway through the non-threaded wall of the lid. Each slot is sized to accept an electrical cord having a plug head.

Abstract: An electrical plug lockout device having an integrally formed pin for engaging with a prong of an electrical plug to prevent unauthorized insertion of the plug into an electrical outlet. The plug lockout further includes shielding means for shielding all of the prongs of a plug against inadvertant or unauthorized use.

Abstract: The invention is a lock for male electrical connectors used with appliances and power equipment and consists of a housing with receiving slots for the connector prongs and a U-shaped spring in the housing containing nibs that engage the apertures on the connector prongs. A spring biased plunger engages the arms and cause them to release the prongs when depressed. Cooperating holes through the housing and the plunger allow a lock to pass through and disable the plunger. The spring biasing the plunger is selectibly changeable for situations where a stronger spring would negate the use of a lock. The housing is sufficiently thin that a three conductor plug could be locked without interference from the ground prong.

Abstract: A small box with a keyed lock into which an electrical plug is placed and then locked for preventing the insertion of the electrical appliance plug into a wall socket comprises a plastic box (A) with a front sliding door (B) and a keyed cam lock (D).

Abstract: An electric plug locking device (10), which remains affixed to an electric plug (13) for preventing unsupervised use of electrical equipment, has an upper housing member (11) movably mounted to a lower housing member (12). The upper housing member which has an opening (23) for receiving a plug terminal (15) moves from a position that shields the terminal to prevent it from being inserted into an electrical socket to a position that unshields the plug terminal to permit it to be inserted into the socket.

Abstract: A cover structure arranged to enclose a power tool plug to discourage access includes first and second housings pivotally mounted relative to first and second anchor straps, wherein the first and second covers each include a respective first and second floor having a respective first and second floor recess when in contiguous communication or a mirror image relationship relative to one another to receive an opening tool within said recess.

Abstract: There is disclosed an addressable device for receiving address coded signals from a central control unit. The device includes an electrical unit that is detachably connected to a base. The electrical unit has a switch for setting the address of the electrical unit. The base has an addressable key that is insertable into an opening in said switch when the addresses of the key and switch match and is not insertable when the addresses do not match. Alternatively, there is an addressable lock on one of the electrical unit and base and a separate addressable key on the other of the electrical unit and base.

Abstract: The Power Cord Lock provides an inexpensive and easily manufactured apparatus to deter the unauthorized use of electrical or electronic equipment by preventing the power cord plug from being inserted into an electrical outlet. The plug is locked by inserting the prongs of the plug into holes in the center block which are sized and positioned to accept known standard two or three prong plug configurations. The plug is secured in the center block by folding two flexible straps attached to the sides of the center block around the plug and power cord and inserting the shackle of a padlock around the power cord through one of several pairs of parallel holes in the straps such that the prongs of the plug cannot be withdrawn from the center block. The flexibility of the straps and the spacing and shape of the sets of holes allow the device to be used with a range of plug cross sections and lengths.

Abstract: Electrical appliance current supply control apparatus in which there is positioned between an appliance plug with current pickup prongs and current input supply prongs a housing having electrical current carrying leads interconnecting the current input supply prongs and the current pickup prongs in which housing one of the electrical current carrying leads is led through a control in the housing which includes a key operated lock to either complete the current supply or to interrupt the current supply to the appliance pickup prongs through the one lead.

Abstract: A two prong plug locking device having opposed top and bottom hemi-spherical housing elements enclosing an intermediate guide lever and guide plate. A keyed tumbler lock turns the intermediate guide lever. Such guide lever is attached to a flexible cable that moves within a channel in the top and bottom housing. A pair of plug prongs inserted into the bottom housing through multiple apertures are engaged by the cable and locked within the bottom housing. By turning the tumbler lock, the cable is retracted from the plug prongs and the plug is released.

Abstract: A device for preventing the unauthorized removal of electrical appliances having a cord terminating in a plug with two prongs having aligned holes therethrough, comprises an enclosure adapted to be opened and closed and having holes through a side wall thereof of a size to permit the insertion of the prongs through the holes but to prevent insertion of the plug through the holes. The enclosure is locked against unauthorized opening. A spring clip within the enclosure is removably engageable within the holes through the prongs and releasably retains the prongs within the enclosure. The enclosure comprises two portions hingedly interconnected, and the lock releasably retains these two portions closed together. The enclosure comprises polygonal channels which, when closed together, form a polygonal enclosure of closed polygonal cross-sectional configuration, preferably rectangular, for example square.

Abstract: An apparatus for securing the prongs of an electrical appliance plug into a block of strong, flexible plastic. The block has a pair of grooves spaced at the appropriate distances to accommodate the parallel prongs of a standard electrical plug. Additionally, the block has an aperture to receive the third, or grounding prong of the electrical plug. A hole, receptive of a bolt, exists at right angles to the direction of insertion of the plug. The hole has a clearance region through the middle and the section of the block adjacent to the bolt head, but is threaded at the section which is opposite the bolt head. The bolt is of the appropriate length to traverse the width of the block when fully tightened into the block. Additionally, the hole may be recessed to form a depression around the bolt head to discourage tampering or probing. Similarly, a recessed region may be formed on the face of the block into which the plug is inserted to likewise discourage tampering or probing.

Abstract: A male electrical connector having an insulating plug body and a cylindrical sleeve surrounding conductive prongs extending from the plug body. The sleeve has at least one aperture in a side wall thereof to removably receive a locking member. The removable locking member is preferably a padlock having a substantially U-shaped shackle extending through the aperture in the sleeve to prevent insertion of the male connector into the mating female connector.

Abstract: An electrical plug lock having a hollow body closed at one end and open at the other end. A closure having a fastening means for holding the closure in the body. The closure has a radially extending slot. A hole is formed in one side of the body to receive the hasp of a lock. When the slot is aligned with the hole in the body and the hasp is in the hole and in the slot the closure cannot be rotated. An electrical plug can be located inside the body and a cord on the plug can extend through the slot in the closure. The hasp of the padlock prevents the closure from being rotated to release the closure from the body.

Abstract: A lockout apparatus for preventing the use of an electrical device is characterized by a body having at least a first channel sized to receive a projecting portion of the electrical apparatus. A bore intersects the first channel and has a locking pin threadably displaceable therein. The locking pin is engagable in securing contact with the projecting portion of the electrical device receiveable within the channel. The body further includes a second bore intersecting the first bore, the second bore being sized for receipt of a member that prevents access to the locking pin disposed in the first bore.

Abstract: An apparatus to prevent the insertion of the prongs of an electric cord plug into an electric outlet, where at least one of the prongs has a hole through it, includes a casing having ports for receiving the prongs of the plug, a latch within the casing for sliding through the prong hole, a lock connected to the latch such that the lock controls the operation of the latch, and a key for operating the lock. At least one channel may optionally be provided in the casing into which the portion of the cord extending from the locked plug can be laterally fitted.

Abstract: An electric plug combination lock for locking the prongs of an electric plug thereto. The lock includes a casing enclosing a chamber having a lock subassembly therein which has a frame lock portion with lock hooks that lock into holes in the prongs of the electric plug, a spring biasing the frame lock portion to the locked position and a combination lock for preventing the frame lock from entering the unlocked position unless the correct combination is present.

Abstract: A male electrical connector with positive locking prongs and shielded blade protection. The connector comprises a plug body, a plurality of curved blades extending therefrom, and a plate carrying locking prongs and axially slidably coupled to the blades and plug body. In one embodiment, the plate is slidably received in a recess in the plug body, while in another embodiment, the plate is coupled to a tube which is slidably received on the exterior surface of the plug body. The connector can include an auxiliary lock-in assembly, a lock-out assembly, or both, as well as a seal to resist ingress of dirt or moisture.

Abstract: A locking apparatus for electrically isolating a trolley-type electrical connector on the end of a conduit on an electrical mining machine or the like, to prevent an electrical connection from being made with the connector. The locking apparatus comprises an open-ended sheath made from an electrically insulating material, slidably mounted on the end of the conduit, to slide between an extended position in which the sheath surrounds the connector, and a retracted position in which the connector projects through the open end of the sheath. The sheath has aligned openings on opposite sides thereof, adjacent the open end of the sheath. A locking member is adapted to extend through the aligned openings and substantially block the open end of the sheath. A retaining cord tethers the locking member to the sheath. A lock can be used to secure the locking member in its position blocking the open end of the sheath.

Abstract: A tubular enclosure for a power connector attached to a power supply line, whereby the enclosure can be moved along the line to a position enclosing the power connector; the enclosure serves as a lock-out device to prevent the connection of the power connector to a power source by unauthorized or untrained persons. In a preferred form of the invention the enclosure is permanently retained on the power line so that it is readily available for use when needed for the lock-out function.

Abstract: A locking device for attachment to the male electric plug on the power supply line to an electric appliance, for the purpose of preventing use of the appliance, comprises a maximum of four separately molded plastic parts, two of which are identical and are secured together to form a housing containing one of the other two components, which is a unitary molded plastic spring locking member. The housing is provided with a pair of slots for receiving the prongs on the electric plug to be locked, and insertion of the prongs into the housing automatically effects the locking action. The device can be unlocked only by a key which is separate from the device, and which is the fourth component and is inserted through an opening into the interior of the housing to release the locking action.

Abstract: A tubular enclosure for a power connector attached to a power supply line, whereby the enclosure can be moved along the line to a position enclosing the power connector; the enclosure serves as a lock-out device to prevent the connection of the power connector to a power source by unauthorized or untrained persons. In a preferred form of the invention the enclosure is permanently retained on the power line so that it is readily available for use when needed for the lock-out function.

Abstract: A housing (11) is provided for insertion of standard size prongs (12) from an electrical plug which are then secured by latching means (16) and securing means (18). The securing means prevents the removal of prongs (12) from housing (11) which in turn prevents unrestricted use of the electrical plug.

Abstract: A closure device clamps over the plug to an appliance for securing the appliance from unauthorized use. The closure device has a base and an opposed hinged cover which closes over the base to enclosed the plug. Twin posts extend upward from the base for engaging twin apertures in the cover when the device is closed. Caps on the posts lock the device closed, and must be severed to remove the posts from the apertures.

Abstract: A lock apparatus (10) for an electrical plug (100) wherein the lock apparatus comprises a housing unit (11) provided with an elongated slot (25') and containing a key actuated lock mechanism (70) which cooperates with a plug capturing member (80) which is slideably disposed in the elongated slot (25'); wherein, the capturing member (80) is provided with capturing arms (83) which are adapted to engage the rear of the electrical plug (100).

Abstract: An electric plug lock is provided for preventing the unauthorized use of an electrically operated appliance which has an electrical cord and plug. It operates by isolating the electrical prongs of the plug in a two part container and then locking the parts together with a conventional padlock.