Abstract: An affordable plumbing device that uses a compressed gas and a burst disk having a relatively even surface of substantially uniform thickness to produce a sudden discharge of energy to forcibly act against any obstruction that may interfere with the proper function of a drain. The plumbing device has a cylindrical chamber for receiving the compressed gas and may generally take the shape of a plunger, which is flexible to use and is easy to store. A portion of the chamber forms a receiving chamber with the burst disk for harnessing and directing the energy of the compressed gas to clear the drain.

Abstract: An affordable plumbing device that uses a compressed gas and a burst disk having a relatively even surface of substantially uniform thickness to produce a sudden discharge of energy to forcibly act against any obstruction that may interfere with the proper function of a drain. The plumbing device has a cylindrical chamber for receiving the compressed gas and may generally take the shape of a plunger, which is flexible to use and is easy to store. A portion of the chamber forms a receiving chamber with the burst disk for harnessing and directing the energy of the compressed gas to clear the drain.

Abstract: An affordable plumbing device that uses a compressed gas and a burst disk having a relatively even surface of substantially uniform thickness to produce a sudden discharge of energy to forcibly act against any obstruction that may interfere with the proper function of a drain. The plumbing device has a cylindrical chamber for receiving the compressed gas and may generally take the shape of a plunger, which is flexible to use and is easy to store. A portion of the chamber forms a receiving chamber with the burst disk for harnessing and directing the energy of the compressed gas to clear the drain.

Abstract: An affordable plumbing device that uses a compressed gas and a burst disk having a relatively even surface of substantially uniform thickness to produce a sudden discharge of energy to forcibly act against any obstruction that may interfere with the proper function of a drain. The plumbing device has a cylindrical chamber for receiving the compressed gas and may generally take the shape of a plunger, which is flexible to use and is easy to store. A portion of the chamber forms a receiving chamber with the burst disk for harnessing and directing the energy of the compressed gas to clear the drain.

Abstract: An apparatus for docking a smaller vessel, such as a dinghy, to a substantially horizonal platform or swimstep of a larger vessel, such as a boat. The docking apparatus comprises a pair of mounting brackets attached at spaced locations to the edge of the swimstep. A substantially vertical bumper attached to each mounting bracket extends vertically above and below the swimstep. An adjustment bracket connected between each bumper and mounting bracket permits vertical, horizontal and rotational adjustment of the bumper with respect to the swimstep. For soft dinghies, a line connected to the dinghy and the bumper docks the two together. For hard dinghies, the bumper includes a cushion interposed between the bumper and the hard dinghy.

Abstract: A latch guard for protecting a door latch installed in a door comprises a removable cover plate with a cylinder pivot hole and two mounting holes located generally above and below the cylinder pivot hole. Adjacent to each mounting hole are two slots that extend from the mounting hole. When installed, the cover plate extends over the space between the door and an adjacent door frame in the area of the latch to protect the latch. The cover plate is mounted to the door by first and second mounting bolts that extend through the slots in the cover plate and completely through the door. Each mounting bolt includes a spacer that spaces the enlarged head of the respective mounting bolt so that the cover plate can rotate about the cylinder pivot hole to allow easy installation and removal of the cover plate. The cover plate may also include anti-spread pins.

Abstract: A door latch guard for guarding the latch of an outwardly opening door and for preventing spreading of the door away from an adjacent door frame comprises a cover plate having a first flat portion for connection to the door and a second flat portion adapted to overlie the adjacent door frame. A third portion of the cover plate, between the first and second flat portions, defines a groove adapted to overlie the door and the door frame and to receive a protruding latch strike plate. The groove includes a flat outer portion having a width adapted to accommodate locks installed in the door at a plurality of different backsets. In addition, the cover plate has a cut-out adapted to allow the cover plate to be mounted flat against the door, without interfering with the door lock hardware, yet still receive the protruding latch strike plate, regardless of the backset at which the door locks are installed.

Abstract: An interlocking latch guard for obstructing and resisting the unauthorized opening of an inwardly opening locked door comprises a frame channel mountable on the outside surface of a door frame, and a door channel mountable on the outside surface of a door. The frame channel has a pair of spaced-apart, parallel side flanges, and a front flange directed perpendicularly to the side flanges such that the frame channel has a generally U-shaped cross-section. The door channel includes at least one interlocking flange, and a back flange directed perpendicularly to the interlocking flange. When the door is closed and locked, and the channels are appropriately mounted by fasteners, the interlocking flange of the door channel protrudes substantially parallel to and in between the side flanges of the frame channel, thereby restricting or blocking access to the fasteners.

Abstract: A door hole cover for covering a hole in a door has two substantially flat cover plates that are secured to opposite sides of the door for covering the door hole. The first cover plate has an attachment tube extending from the center of its inner surface such that the attachment tube is positioned inside the door hole during assembly. A centering disk is placed over the attachment tube and held in place by a retainer clip. A fastener fits through a hole in the second cover plate and engages an internally threaded hole in the attachment tube to secure the first and second cover plates to the door in a position covering the door hole. The centering disk inside the door hole substantially prevents movement of the cover plates in a plane that is parallel with respect to the door. The centering plate may include three removable tabs that are left in place to cover relatively large door holes, but may be removed to cover smaller door holes.

Abstract: A locking device for securing a sliding window in either a fully closed or partially opened, vented position includes an elongated bar, a venting link and a clamp that attaches to the window channel. The bar may be attached to the clamp in either of two opposing orientations and thus may secure the window irrespective of whether the window opens to the left or the right. The bar is connected to the clamp by a retaining pin that engages a slot in the bar, and a spring-biased locking button on the clamp that engages one of two locking apertures in the bar.

Abstract: A locking device for securing a sliding door in either a fully closed or partially opened, vented position. The device comprises an elongated bar having one end pivotally attached to the door frame and a free end with a specially shaped recess adapted to engage a lock assembly connected to the door. The lock assembly includes a rotatable shaft having a substantially rectangular cross-section for locking engagement with the bar's recess. Rotation of the shaft between locked and unlocked positions respectively locks and unlocks the bar to the lock assembly. The free end of the bar also may have a folding vent link having a similar specially shaped recess that may be used for venting of the door, while still securing it to prevent unwanted entry.

Abstract: A generally U-shaped protective door shield that engages the swingable edge of a door defines a bolt opening that is to be aligned with a bolt aperture of an underlying face plate of a bolt or lock mechanism. Common anchoring screws are driven through the shield and the face plate into the door, forming a single integral structure of increased strength and insuring proper alignment. Preferably the face plate has recessed screw holes that receive lips on the shield. These lips may be deformed into the recesses by the anchoring screws.

Abstract: A strike plate has a center section with an aperture for receiving a bolt or latch, and upper and lower sections, disposed on opposite sides of the center section, that include interlock surfaces and horizontally elongated slots for receiving screws. Upper and lower keeper plates have corresponding interlock surfaces that engage those of the strike plate in a selected position to prevent movement of the strike plate. The keeper plates have round screw holes that can be aligned with the slots of the strike plate. Preferably, the interlock surfaces are formed by contiguous, V-shaped, vertically extending grooves.

Abstract: A door lock of the dead bolt type in which an eccentric cam on the inner end of a lock cylinder can be rotated to engage a deformation in a ring, causing the ring to rotate. A linkage connects the ring to a bolt so that rotation of the ring causes reciprocation of the bolt, the ring being concentric with and supported by the cylinder. An engagement portion of the ring that extends beyond the cylinder forms the deformation, preferably a recess, permitting the cam to engage and disengage the recess as it makes a complete revolution. The cam engages opposite ends of the recess to move the bolt in opposite directions. A spring, that can be disposed within the bolt, is used to bias the ring toward positions corresponding to extended and retracted positions of the bolt.A catch mechanism can be provided to engage a housing and resist movement of the bolt if the bolt is forced toward its retracted position.

Abstract: A door lock including a bolt connected by a link to an actuator mechanism by which it is movable within a housing between a retracted position and an extended position. A pin and slot connection between the bolt and link form a coaction mechanism that causes a prong on the link to engage an abutment on the housing when a force is applied to the extended bolt in the direction of its retracted position. As the link pivots, a second abutment on the housing is engaged to further resist bolt movement. The force is then absorbed by the housing rather than the more fragile actuator mechanism. If the bolt is subjected to a force that would tend to pull it from the lock, the link engages another abutment on the housing to retain the bolt.The bolt is movable a short distance from its normal extended position by compressing a spring without transmitting to the link the force applied to the bolt. A hardened security pin within the bolt normally transmits the spring force to the link to avoid looseness.

Abstract: A protective door shield and mounting for a lock, particularly a mortise lock or double lock, including a generally U-shaped plate that engages the swingable edge of the door in the region of the lock and a plurality of interchangeable inserts seated in openings provided in opposing side panels of the plate. Apertures in the inserts accommodate door knob shanks, lock cylinders, thumb turns and the like. The shield permits the substitution of a lock having a different arrangement of apertures without replacing the door, while it strengthens the door and provides a convenient push plate. Since the inserts are interchangeable, a standardized shield may be readily adapted for use with a wide variety of locks. The lock face plate is received by a recess in the shield and can be surrounded by a trim plate, if required.

Abstract: A door lock structure adapted to be actuated by a magnetic card key to operate a conventional cylindrical door lock with substantially no modification to such lock. A housing containing the magnetically operated elements of the lock is mounted, along with a modified knob, on the conventional spindle of the lockset in lieu of the usual door knob. The housing is freely rotatable relative to the lockset spindle to prevent wrenching. The latchbolt retractor of the lockset is actuated in the normal manner to unlock the lockset by rotating a conventional driver bar. The driver bar in this structure is rotated by registering interengaging elements carried by the driver bar and a slide which is actuated by a properly coded magnetic card key. The modified knob may be freely rotatable on the spindle or may be fixed thereto.