"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 7334541 | Animal behavior shaping device A device for shaping the behavior of an animal using a behavior marking and reward delivery system is provided. The compact behavior shaping device includes a battery, a trigger assembly, a receiver, a spring assembly, and a bore assembly, and is capable of storing ... | 02/26/2008 |
| 7293774 | Moving shooting target system A moving shooting target system for providing a first stationary target that triggers a second moving target when stricken with a bullet. The moving shooting target system includes a frame with a shooting opening and a target reservoir, a first target attached to a ... | 11/13/2007 |
| 7270332 | Activity sets A play activity set including a target at which objects may be directed, a plurality of objects for throwing at the target, the plurality of objects including at least a first object with a first opening therethrough and a second object with a second opening thereth... | 09/18/2007 |
| 7232092 | Flying vehicle-launching apparatus and method A flying vehicle-launching apparatus and method for launching a winged flying vehicle by accelerating the vehicle in a predetermined direction includes a flying vehicle-supporting platform, a guide device, and a driving device. The flying vehicle-supporting platform... | 06/19/2007 |
| 7213724 | Table tennis ball delivery device A table tennis ball delivery device adapted to be secured to or adjacent the side of a table tennis table for directing a ball to a player upon the activation of a switch by the player. The device includes a chamber for carrying a supply of table tennis balls, a bal... | 05/08/2007 |
| 7195197 | Techniques for controlling a fin with unlimited adjustment and no backlash A fin control assembly includes a housing, an arm configured to couple to a fin and to steer the fin relative to the housing, and a locking member disposed within the housing. The locking member is configured to (i) lock the arm in a substantially fixed state to inh... | 03/27/2007 |
| 7125058 | Locking device with solenoid release pin A locking device with a solenoid release actuator includes a housing, a plunger axially slidable within the housing, a biasing member for biasing the plunger in a first direction, one or more locking balls, and the locking balls disposed in an aperture in the housin... | 10/24/2006 |
| 7040310 | Paintball projectile drop compensator A barrel adaptor for a paintball gun is provided to induce spin onto a paintball exiting the barrel of the paintball gun thereby providing selected projectile drop compensation. The adapter consists of a structure having an elongated aperture with a first end adapte... | 05/09/2006 |
| 6962027 | Masonry attachment pin and method of use A masonry pin assembly and method of use is provided for aligning and setting masonry materials used in construction. A masonry pin assembly is provided having a substantially cylindrical cartridge, a spring residing within the cartridge and reacting against the car... | 11/08/2005 |
| 6953033 | Ring airfoil launcher toy with safety features A ring airfoil launcher comprises a main support on which is movably mounted a ring airfoil accepting conical chuck and a retractor. A stop mounted on the main support for limiting forward movement of the chuck. A spring biases the chuck towards the stop. The retrac... | 10/11/2005 |
| 6752682 | Hand-launched toy rocket A cylindrical toy rocket that measures at least 8-inches long and 2½ inches in diameter. The rocket has a weighted rubber nose cone that is mounted on an inner slide tube that fits inside the rocket's main body tube in contact with a compression spring. At least th... | 06/22/2004 |
| 6708683 | Spear gun having side-by-side spears A spear gun includes two spears disposed in laterally spaced relation to one another. A separate trigger is dedicated to each spear. Each spear is received within the lumen of a forward spear guide tube and a rearward spear guide tube. Each forward spear guide tube ... | 03/23/2004 |
| 6481429 | Simulated gun A simulated gun for use with a disk-shaped or substantially disk-shaped flying member made of a metal as a bullet for discharging it forward, the simulated gun comprising: a gunbarrel having the hollow whose cross section along a direction normal to a fly... | 11/19/2002 |
| 6112733 | Intrusion apparatus An intrusion apparatus for safely propelling a non-lethal diversionary device into a structure through a barrier. The intrusion apparatus comprises an extension device adapted to be gripped by an individual and being movable generally towards the barrier ... | 09/05/2000 |
| 5979424 | Toy gun for firing balloons A toy gun can be equipped with a specially configured ram for firing air-filled or water-filled balloons. The forward surface of the ram has a hemi-spheric contour, so that the ram has extensive surface area engagement with the balloon rear surface. When ... | 11/09/1999 |
| 5933892 | Multipurpose bottle cap launcher A multipurpose bottle cap launcher (14) comprising a body member (16). An assembly (18) in the body member (16) is for shooting a bottle cap (20) therefrom for recreational target practice. A structure (22) in the body member (16) is for removing a bottle... | 08/10/1999 |
| 5842907 | Radio-controlled toy missile launcher A radio-controlled toy missile launcher with missile launch mount having a first end mounted on a chassis and a second end movable upward and downward. The missile launch mount has at least one missile projector accommodating a missile. A supporting membe... | 12/01/1998 |
| 5803060 | Missile launching Missile launching apparatus includes a housing section and a trigger mechanism. The trigger mechanism is integrally formed from a common piece of material with the housing section to define a single component.... | 09/08/1998 |
| 5690089 | Mechanical hand grenade launcher A mechanical hand grenade launcher comprised of a launch tube and spring-ven plunger for propelling a hand grenade to a target area. At the aft end of the launcher is a charging handle that when pulled rearward compresses a spring within the launcher tub... | 11/25/1997 |
| 5681230 | Automatic basketball return apparatus An automatic ball return apparatus includes a ball retrieval net with a chute at the lower end for receiving an directing a ball to a ball return mechanism. The ball return mechanism includes a frame with guide rails for directing a ball forwardly out of ... | 10/28/1997 |
| 5456036 | Animal scent dispensing pistol assembly An animal scent dispensing pistol assembly for dispensing scent for attracting animals comprising a pistol including a barrel having a sealed base end, an opened tip end, and a bored intermediate portion therebetween; a handle extended from the barrel; a ... | 10/10/1995 |
| 5447144 | Apparatus for throwing footballs Apparatus for propelling projectiles and particularly suited to throwing footballs. The apparatus includes (a) a structural frame having elongate bearing surfaces and a forward end from which the projectiles are ejected; (b) a ball carriage adapted to con... | 09/05/1995 |
| 5363833 | Leg-loading spear gun A spear-gun is disclosed which can be loaded by holding the butt end in the hands and moving a slider forwards with the feet to extend a spring. This allows a person of given strength to more easily load the gun or to store more energy in the spring than ... | 11/15/1994 |
| 5355866 | Power dart launcher A hand-held launcher for a dart comprises a pistol-shaped frame with a stock and handle. A channel is provided in the stock to receive a slidable launcher block. The dart is received in the launcher block. The launcher block is spring biased forward and r... | 10/18/1994 |
| 5311855 | Bow launcher and arrow system In order to provide enhanced performance from fletching, a stabilizer is operatively associated with an arrow shaft to be moveable from a launch position near the tip of an arrow at one end thereof to a flight position near the nock of the arrow at the ot... | 05/17/1994 |
| 5265583 | Automatic ball control apparatus This invention relates to an automatic ball control apparatus readily connectable to a ball ejector barrel on a ball ejector machine to impart top spin to ejected tennis ball members. The automatic ball control apparatus includes a ball top spin actuator ... | 11/30/1993 |
| 5254030 | Rapid action toy vehicle launcher A toy vehicle launcher includes a generally planar base having a pair of angularly disposed downwardly sloped toy vehicle feed ramps coupled thereto. A pivotally supported carriage defines a pair of angularly disposed launching stations for receiving toy ... | 10/19/1993 |
| 5145740 | Retractile speargun line A retractile speargun line suitable for use in conjunction with a speargun comprising a line of flexible linear material having a first end adapted for connection to a speargun and a second end adapted for connection to a speargun spear by the use of a cl... | 09/08/1992 |
| 5062406 | Attachment for crossbow that shoots arrows to enable the crossbow to shoot slugs Apparatus is provided to shoot both arrows and slugs. A crossbow has a longitudinal groove for guiding a feather of an arrow being shot by the crossbow. An attachment may be added to the crossbow to enable the crossbow to shoot slugs. When the attachment ... | 11/05/1991 |
| 5050575 | Disk launcher A disk launcher includes a generally cylindrical housing having a handle depending downwardly therefrom. The housing further defines an interior cavity within which a launching shuttle is pivotally movable under the urging of an internal power spring. An ... | 09/24/1991 |
| 5033446 | Scent projectile missile and launcher This invention relates to a device and method for better enabling outdoors-people to see more wild animals up more closely by helping to cover up or mask their human scent at a greater distance. In the method of the present invention the outdoorsman arriv... | 07/23/1991 |
| 4860719 | Magnetic hold-down device for crossbow A hold down device for a crossbow arrow or bolt uses a magnet supported and adjustably positionable in the tray beneath the ferro magnetic arrow head to hold the arrow against the arrow rest.... | 08/29/1989 |
| 4827893 | Shooting guide for bows A combination of a shooting bow and a guide assembly is provided for use with a projectile. The bow includes an elongated frame. The guide assembly is connected to the frame and includes a guide member for slidably supporting and guiding the projectile. T... | 05/09/1989 |
| 4722318 | Crossbow bolt stabilizer In a crossbow of the type wherein a bolt is supported solely at its front and rear ends, a spring-loaded bolt stabilizer is provided which cooperates with the front bolt rest to maintain a bolt in position. The stabilizer may be pivotally mounted on the c... | 02/02/1988 |
| 4721091 | Ball projectile machine A ball projecting machine comprises a ball striker in the form of a bar secured to a shaft rotatably mounted by bearings in a part of a machine frame. The striker carries a pin on the same side of the shaft as the end of the striker which strikes the ball... | 01/26/1988 |
| 4714069 | Volleyball setting machine A volleyball setting machine includes a leaf spring powered propulsion assembly mounted on a portable main frame. Several volleyballs are carried in a ball holding rack and are delivered one at a time to be positioned by a ball positioning track up agains... | 12/22/1987 |
| 4696281 | Projectile shooting guide for bows An elongated guide member is positioned on a bow and extends longitudinally in a direction of shooting motion of the bow's bowstring. The guide member includes elongated parallel portions for guiding both short projectiles and arrows. A short projectile i... | 09/29/1987 |
| 4690654 | Toy vehicle carrying case and launcher A toy vehicle carrying case and launcher having a clip for carrying on the belt of the user. The clip retracts as the case is placed on a surface for launching. The vehicle and launcher are completely enclosed in the carrying mode. A ready button releases... | 09/01/1987 |
| 4642066 | Toy vehicle launcher and sound generator An apparatus for launching toy vehicles utilizes a hexagonal magazine, rotatably mounted on a frame, having a plurality of pairs of open-ended chambers therein. The magazine is rotated to align a pair of chambers having toy vehicles therein with, respecti... | 02/10/1987 |
| 4579100 | Ball throwing machine A machine for propelling a ball comprising an elongated barrel having an axially compressible coil spring therein that is controlled by an axially reciprocable screw disposed coaxially with and internally of said spring. A nut is threadably engaged on the... | 04/01/1986 |