Abstract: This food dish for pets is to prevent vermin or insects from reaching the food in a pet food dish, because many pets refuse to eat food, which is infested with insects or vermin. This dish is formed so it contains water and pet food. To prevent insects or vermin from reaching the food, the food dish is formed with barriers in the forms of a small cup, which may contain detergent or other chemicals poisonous to insects. These barriers are positioned so they require the insects or vermin have to swim over the detergent or other poison to reach the food. This has the effect of killing the insect before it can infest the food.

Abstract: In order to adjust the tone of a machine made stringed instrument, so the notes of the machine made stringed instrument are balanced, the sounding box of an initial test instrument is constructed. Then the surface of the sounding box is tested to determine regions of excessive resonance. Next, to control excessive resonance, resonating regions of the sounding box are covered with one or more layers of a wood based sheet material until the overall tone of the test instrument is satisfactory. Then machine made duplicates of the sounding box of the instrument are made. The location of the wood based sheet material having been determined, the new instruments are provided with the same material at the same locations, so the resulting instruments all have the same tone.

Abstract: An automobile anti-theft alarm has an internal air pressure sensor and an external pressure sensor and a connecting electric circuit. The internal pressure sensor is mounted inside the compartment of the automobile and is connected through the electric circuit to an alarm in such a way that when the internal pressure sensor detects a pressure change the alarm will sound. The external pressure sensor is mounted outside the compartment of the automobile. Air pressure fluctuations originating outside the vehicle compartment are transmitted by the flexure of the vehicle body into the vehicle. The electric circuit is connected to an alarm and to both the inner and external pressure sensors in such a way that external air pressure fluctuations affect both sensors and the outer pressure sensor produces a voltage in the electric circuit which prevents the alarm from being activated.

Abstract: An IFF device comprises a beam generator for directing an unmodulated beam at a target. The target has a plurality of retro-reflectors mounted on it. These retro-reflectors have internal reflecting surfaces for reflecting the unmodulated beam penetrating the retro-reflector. A device is associated with the internal reflecting surfaces for modulating the beam at a predetermined frequency so that the reflected beam emerging from the retro-reflector is modulated at the same frequency. A tuner is positioned in the path of the reflected modulated beam and tuned to predetermined frequency, so that if the tuner receives a signal, it indicates the target is friendly.

Abstract: A gang mail box for an apartment building comprising an outer frame and an inner frame. The inner frame is pivotally connected to the outer frame which is secured to a wall of the building. A number of individual mail boxes corresponding to the number of apartments are mounted on and pivotal with the inner frame. These individual mail boxes are shaped so when the inner frame is pivoted, the tops of the individual mail boxes are exposed so the mail carrier can insert mail in them. Each mail box is provided with a hinged door having an individual mail box lock. A tempered steel security bar is provided to cover and conceal the tenants' locks on the individual mail boxes to prevent theft. This bar is hinged to the inner frame and is provided with a padlock for securing the bar in place.

Abstract: A universal carrier comprises a pocket holding support and a harness for attachment to the body of a person carrying objects on the support. The support has an outwardly facing surface whereon various sized article holding pockets can be secured. A strap like extension extends from the support and is attached to a vertical strap on the harness. Article holding pockets are secured to the outwardly facing surface on the support, and at least one water bottle carrying pocket is secured to the vertical strap on the harness. The water bottle is attached at a proper level and has a flexible tube extending out from its mouth enabling a person engaged in an activity requiring the use of both hands to move his head so the end of the tube can enter his mouth permitting the person to get a drink without using his hands.

Abstract: This is a device for detachably attaching large wheels to the bottom of a suitcase. The wheels are connected together by a common axle. A bracket is molded or attached to the bottom of the suitcase and the bracket has axle receiving slots formed therein. A lever is pivotally mounted on the bracket, and when the axle of the wheels is inserted in the axle receiving slots, the lever is pivoted in a direction which closes off the entrance to the slot and locks the axis in the slot. A device is provided for pivoting the lever in a direction which allows the axle to be removed from the slot.

Abstract: A television viewing device for simulating the environment of a motion picture theater comprising in combination a viewing screen having an opening formed therein sized to expose the television tube. A pair of glasses like frames is used with the viewing screen. These frames having light blocking shields for preventing ambient light in the room in a home where a television set is situated from entering the eyes of the viewer through the top, bottom and sides of the frame. A light blocking shield is mounted in front of the frame in place of the glasses. This shield is provided with a narrow slit which can be varied in size, through which light from the viewing screen and television tube can be viewed. The surface of the viewing screen facing the viewer painted black so the only light visible to the viewer comes from the viewing screen, whereby the environment of a motion picture theater can be simulated in the home.

Abstract: A guidance system for of vehicle, such as a model airplane which has directional control devices. A device is mounted on the vehicle or at some remote station to generate a command attitude signal. At least two sensors are mounted on the body of the vehicle and face in opposite directions away from the body of the vehicle. These sensors are connected together in such a way that radiation falling on the sensors causes the sensors to produce a signal such that the signal at the junction between the sensor is functionally related to the orientation of the vehicle. A servo mechanism is mounted on the body of the vehicle and is connected to the directional control devices of the vehicle. An electric circuit is connected between the signal from the sensors and the device that generates a command attitude signal and the servo mechanism.

Abstract: A mail box for an apartment building comprising a number of individual mail boxes corresponding to the number of tenants. Each mail box has an individual mail box lock. Releasable locking means are connected to the mail boxy for covering the individual mail box locks until mail is to be removed to prevent theft. Unlocking means are provided for unlocking the releasable locking means to expose the individual tenants lock so they can get their mail.

Abstract: A self elevating signalling device for water skiers makes them more visible if and when they fall off their skies into the water. The device comprises an enlarged visual luminescent marker comprising an outer guide tube and a buoyant tube freely mounted inside the guide tube secured to a flotation jacket and positioned in a vertical position when the fallen skier is in the water. The guide tube has an opening formed therein below the surface of the water permitting the guide tube to fill with water causing the buoyant tube to rise inside the guide tube. The length of the buoyant tube is such that the water inside the guide tube lifts the buoyant tube above the head of the person wearing the flotation jacket enabling rescuers to locate him.

Abstract: A door positioning device comprising a housing concealed in a door jamb and a mechanism mounted in the housing for holding the door open in one or more selected positions. The mechanism comprises a cylinder mounted in the housing wherein a slidable piston is mounted. Linkage connects the piston to linkage mounted onto the door, in such a way that when the door opens, the linkage forces the piston upward in the cylinder. A shaft integral with the piston depends from the piston and is moveable with it. The shaft has a plurality of vertically spaced roller receiving recesses formed thereon. The housing has a movably mounted roller biased toward the shaft so as the door opens, the shaft moves upward in the cylinder until the roller moves into one of the vertically spaced recesses whereby the door is held open at a selected position. In this way when a slight pressure is exerted on the door it overcomes bias holding the roller in a recess formed in the shaft, allowing the door to close.

Abstract: A flush bolt boring jig is rigidly attached to a drill. The drill has a bit which is the length of the bore to be formed in the door. The jig holds the drill rigidly so the bore being drilled in the door is parallel to the free end of the door. This is done by tracks mounted by clamps in such a way that the tracks are parallel to the free end of the door. The jig is attached to a pair of slide tubes which slide on the tracks. Since the drill is attached to the jig, as the hole in the door deepens, the drill moving with the slide tubes over the tracks moves in a straight line so that the bore being formed is exactly parallel to the free end of the door.

Abstract: A replacement unit for a conventional bicycle which can be installed without modifying the bicycle requires the original seat and seat shaft to be taken out of the bicycle frame and replaced by the replacement unit. This unit comprises a tube which fits inside the vertical tubular bicycle frame. Inside the tube is a coil spring and a shaft. The coil spring is compressed by the weight of the shaft, and the weight rider sitting on the seat. When the rider places his weight on the pedals, the spring inside the tube lifts the seat. A plurality of stop members are disposed along the shaft and a pin is positioned to engage the stop member to lock the seat at the correct height above the frame, depending on the needs of the driver.

Abstract: An electrical connector for audio devices using earphones, has the shape of a snap jack in contrast to the conventional plugs and jacks which are long and thin. The snapjack shape of the connector provides a large area of electrical contact between the plug and the jack, so that if the audio device is portable and subjected to intense vibration, the electrical connection between the plug and jack will be strong enough to withstand this vibration without introducing noise into the circuit.

Abstract: A cabinet for displaying articles which can be used in two positions. The cabinet is provided with a plurality of divider walls dividing the cabinet into a plurality of differently sized article receiving pigeonholes or slots. The cabinet is constructed so that depending on the position of the cabinet the articles will be displayed in a horizontal or vertical position. The cabinet has at least two identically sized drawer receiving slots, each sized to receive a drawer. The drawer receiving slots are disposed perpendicular to each other and are positioned so that regardless of whether the cabinet is in one position or another one of the drawer receiving slots is along side a wall of the cabinet and the other drawer receiving slot is horizontal in the cabinet. In this way a drawer can always be inserted in a horizontal drawer receiving slot regardless of the position of the cabinet.

Abstract: The bracket comprises a base portion, one end of the base portion is bent upward defining a wall, the upper end of the wall is bent transverse to the wall extending over the base portion. An adjusting strip is mounted on the upper wall of the base portion and a view finder support is mounted on the adjusting strip. A view finder is mounted on the view finder support. The upper wall of the base portion and the adjusting strip and the view finder support are dimensioned so that the view finder is mounted centrally over the top surface of the video camera.