Abstract: A polarity indicator adapted to be mounted on a vehicle battery. A light emitting diode mounted on an elongated non-conductive strip and electrically connected to two poles having conductive surfaces at each end of the strip. The poles are intended to be oriented to correspond to the polarity of the battery terminals. When the battery is depleted and needs to be boosted, the booster cables are first connected to the poles which can identify the direction of the flow of current coming from the booster cables, the later being subsequently switch to the proper terminals of the battery.

Abstract: A liquid level control system for automatically stopping the flow of water in a bathtub. The system includes an adjustable level control mechanism and a flow control device. The control mechanism comprises a float suspended from a flexible chain and slidingly mounted in a vertical chamber hydraulically linked to the bathtub. When the float is buoyantly actuated by the level of the water reaching a predeterminedly set height, the flow control device obturates the inlet of water coming from the water supply conduit.

Abstract: A mailbox charecterized by a tubular container having a flat back face adapted to rest against a door surrounded by a door jamb. The back face extends upwardly into a flat plate which hangs on a door knob. The container has an opening at one end which abuts against the door jamb for closing this one opening. The opening at the other end is provided with a unidirection gate for preventing withdrawal of letters and papers inside the container. Access to the inside of the container is reached when the door is opened.

Abstract: A driving device for initiating and maintaining a spinning top in a continuous movement of rotation and precession. The driving device is made of a shaft adapted to axially rotate in a tube on which is concentrically fixed a rim. A top is hingely connected by its central post to the end of the shaft adjacent the rim. The post is able to rotate around the rim through a ball-bearing joint and the friction between the post and the rim causes the top to spin around the rim. By momentarily braking or changing the direction of the shaft with a manual contact on the shaft, it is possible to create a precession movement to the spinning top which will raise above the rim.

Abstract: A ski spur made of a supporting block and a horseshoe-shaped member axially supported by the block between a horizontal and a vertical position. A locking rod excentric to the axle extends between the legs of the horseshoe-shaped member of the latter and acts as a stopper on the block in both vertical and horizontal positions. The axle is preferably mounted in a substantially vertical slot provided in the block and is resiliently urged toward the ski.

Abstract: A locking device for double sliding doors or windows consisting of at least two separable and superposed plates to be located between the adjacent vertical jambs of the exterior and interior doors. The plates have a shank and two oppositely directed tongues at each end of the shank. The plates are thin enough to be separately introduced edgewise between the adjacent jambs and rotated flatwise one over the other. The space between the tongues is determined to abut against the adjacent jambs. All the plates are fastened together to prevent them from being rotated edgewise and removed from between the jambs.

Abstract: A stair supporting frame made of a pair of stringers and a set of triangular blocks slidingly fitted in a groove provided in upper surface of the stringer. The groove has a uniform width defined by parallel sidewalls and the width of the blocks corresponds to the width of the groove. The blocks can slide into and along the groove. The degree of penetration of the blocks in the groove does not affect the outer appearance of the blocks relative to the stringer.

Abstract: An apparatus for detecting faulty power line insulators of the suspension type on an energized power line by comparing two adjacently mounted insulators in series. The apparatus is generally made like a three-prong fork. Each prong has a metal tip forming a probe adapted to conductingly straddle two adjacently mounted insulators. The lateral prongs are each connected to the central prong through a high voltage resistor and an ammeter. Comparison of the amperages registered by both ammeters indicates the existence of a faulty insulator.

Abstract: A vehicle hoist having four separate pivoting shafts. Each shaft is pivotally and slidingly mounted at its lower end on a transversal cylindrical beam which is fixed on a frame. The shaft is adapted to move between a horizontal and a vertical position. The frame is fixed on a base structure and adapted to longitudinally slide on it. The top of each shaft is pivotally connected to an anchoring member which is adapted to grip the rocker panel pinchwelds of the vehicle. When the vehicle is pulled horizontally, the four shafts gripping the vehicle, raise the latter. Abutting components stop and hold the shafts in their upright position. The transversal and longitudinal movements are provided to adjust to the width and the length of the different types of vehicles.

Abstract: This invention consists of a container inside which potatoes or other vegetables or food may be kept until eaten within a short term. This parallelepiped-shaped container is a one-piece device provided with three different openings: there is one on the upper part of the container, one on the front part and a third one on the lower part. The three openings are themselves provided with three identical covers. The appropriate shape of the container provides a good rotation and ventilation of vegetables. Also, a plastic screen situated on the lower part of the container permits the filtration of vegetable deposits, which may be removed by opening the bottom cover.

Abstract: An alarm system mounted in a casing intended to be installed in a door. The casing includes a power supply, a noise producing device and a circuit for connecting the power supply to the noise producing device. The circuit includes a key operating device and a mechanism responsive to a detecting knob located on the stile of a door. The key operating device comprises a tumbler switch and a cam operated by the switch which is mounted in the circuit. The mechanism responsive to the knob comprises a hingely mounted plate connected to a spring for biassing the plate in the direction of the cam and the switch. The switch can close the circuit when the door opens and the knob projects outside the stile of the door. Additional cams, tumbler switches and circuits may be combined for producing a variety of alarm producing conditions.

Abstract: The incinerator is made of a loading member, a burning chamber, a combustion chamber and a duct member having a restricted dimension for connecting the burning and the combustion chambers. The loading member is an upstanding cylinder for receiving the waste material and dropping it in the burning chamber. The burning chamber has a floor located at such a distance from loading cylinder so as to obtain the spreading of the waste material in a generally frusto-conical shape. A peripheral wall around the burning chamber is dimensioned to leave an air space around the frusto-conical shape. An air intake in the peripheral wall provides a circulation of air in the air space. The duct members are diametrically opposed to the air intake and funnel the hot fumes from the burning chamber to the combustion chamber. The concentration of the hot fumes in the duct members considerably raises the temperature in the duct members for a practically complete decomposition of the products in the fumes.

Abstract: A clothes drying rack adapted to be fixed to a ceiling and between lateral walls surrounding a bathtub. It includes a rectangular frame having cross-bars secured to the frame. The frame is supported to the ceiling by a pair of brackets having a flange in the plane of the frame. Each bracket is mounted on two opposite long sides of the frame. The frame is also supported by two pairs of S-shaped hooks slidingly mounted on the two opposite short side of the rectangular frame. These hooks have an eyelet at each end. The eyelets are twisted in planes perpendicular from each other. The frame is preferably made to be sidingly adjustable relative to the bracket and the hooks so that the rack can be installed above the bathtub while it is secured to the most solid parts of the surrounding walls and the ceiling.

Abstract: A sound box for violin, made of molded plastic, is made of a lower and upper sound board and an intermediate surrounding sidewall sealed together. The sound boards are molded with ribs on their internal surface. The handle is molded with the lower board and extends from a large axial rib on the latter. The handle and the large rib have a core made of hard wood.

Abstract: A coin operated lock for ski racks comprises a latch secured to an inner sliding member provided with a passageway for receiving a coin. The passageway has an opened bottom obstructed by a tiltable cam plate which hinder the movement of the sliding member. The introduction of a coin in the passageway tilts the cam plate and releases the sliding member. A key operated lever actuates the liberated sliding member and projects the latch outside the lock for engaging into a catch.

Abstract: A sheet cover for a swimming pool adapted to become arched over the pool when air under pressure is projected under the cover. The cover has a pending skirt adapted to hang in the water adjacent the peripheral sidewall. The skirt is provided with a series of holes at a distance from its lower edge. When the cover is arched, the skirt raises until the air leaks through the holes to maintain the cover at a desired height.

Abstract: A security box adapted to be mounted on a bicycle bar comprises a tubular container slidably mounted in a sleeve member. The container has a sliding cover at one end which locks by a tongue arrangement which engages the container per se. The container has a pin retractably projecting through its periphery and adapted to penetrate into a recess in the sleeve member. The pin can be retracted from the recess only from the inside of the container. The sleeve member which is fastened to the bicycle bar cannot be unfastened when the container is in the sleeve member.

Abstract: A saw table having an undercarriage mounted under the table pivotable about an axis adjacent one of its lateral sides and angularly actuated by a handle extending on the side of the table opposite the axle. The undercarriage has a frame extending outside the one side of the table and above the latter. A carriage, adapted to support the circular saw is slidingly mounted on the frame to move above and across the table.

Abstract: A dice shaker having a hinged cover provided on its lowered surface with an L-shaped partition which delimites an enclosed space when the lid is closed. The cross-section of the space corresponds to the cross-section of a die in order to limit or hinder the rotation of the dice located inside that space.

Abstract: A shelf bracket formed by a sheet of material having a rectangular front flange and a two triangular lateral flanges extending from two opposite sides of the rectangaular front flange. The two lateral flanges are folded towards each other along the said opposite sides of the front flange. The wide end of the lateral flanges are adapted to be fastened to an upstanding exposed stud. The upper edges of the three flanges are coplanar and adapted to support one end of a board to form a shelf.