Abstract: A hold down clamping means for screening or screen panels mounted on rain gutters attached to a facia board of a house comprising a clamping means and a hold down arm; the clamping means, when positioned over the outer wall of the rain gutter, locks the hold down clamping means to the gutter and positions the hold down arm into contact with the screening or screen panels to hold them securely in place.

Abstract: A dental apparatus, in combination with a dental handpiece that incorporates a rotable chucking mechanism with a locking means, and a driving mechanism that rotates the chucking mechanism at high speeds when actuated, comprising a dental bur which has a tool head at one end and a shank segment at the other end, a portion of the shank segment is received and locked in the chucking mechanism, and a barrier and deflecting means mounted intermediate the ends of the dental bur, the barrier and deflecting means upon being rotated by the chucking mechanism forming a barrier or shield and also creating air streams to intercept and prevent air-borne particles generated by dental procedures from being deposited on and in the handpiece.

Abstract: The engine of this invention comprises at least one hollow cylindrical member within which is a non-moveable disc that separates the cylinder into two opposite bores. A stationary piston is slideably contained in each bore. Each bore-piston combination contains an ignition means, a fuel passage and an exhaust passage. A valve connects with each of the passages and is timed to open and close to provide fuel, compression, and exhaust in conjunction with the ignition means to cause the cylindrical member to move in a reciprical motion with respect to the stationary pistons.

Abstract: A roll retaining means for retaining a roll of sheeting material in a dispensing box comprising a rod having two end segments with one of the segments being provided with a piercing means and a sleeve mounted thereon adjacent to the piercing means, the sleeve, upon being inserted through an end wall of the dispensing box, retains the roll in position when the other of the end segments is secured to the box.