Iowa State University Research Foundation, Inc.

Other

Knight Rifle, Inc.

Vibroacoustics Solutions, Inc.

Jerald M Vogel

Vinay Dayal

Eric Hengstenberg

Howard D Carr

Steven J Winter

J Adin Mann, Iii

Ambar K Mitra

Atul G Kelkar

Matthew D Moore

Hemanth Porumamilla

Steven J Hooper

Jerry L Hand

An apparatus for minimizing the transmission of vibrations from an un-sprung mass object to a sprung mass object through continuous control of system natural frequency and damping ratio including an air spring, a source of high pressure compressible gas, a vacuum source, a variable volume accumulator and a gas flow rate control valve to allow specified gas flow between the air spring and the accumulator thus generating variable system natural frequency and damping ratio.

Continuously variable natural frequency and damping vibration isolation system

An apparatus that prevents collapse mode and sling-shot mode of the accumulated air spring vibration isolation system is presented. The apparatus is contained in an air spring which is connected to accumulator. The apparatus blocks air flow to the accumulator when the air spring is attempting to bottom out, resulting in a soft pneumatic stop for the suspended mass. High pressure air within the air spring at its lowest height is evacuated to the accumulator, thus precluding a 'sling shot' reaction of the suspended mass. The apparatus incorporates a double acting air cylinder with an orifice disk attached to a piston shaft end and an orifice contained within the air spring head. The upper air cylinder volume is vented to the air spring interior compartment through an unrestrictive orifice and the lower air cylinder volume is vented to the high pressure source through a highly restrictive orifice.

Pneumatic vibration isolation device

An improved action for a muzzleloading firearm which allows loading an ignition system from above, and completely releasing the action from below. The system covers the ignition system during firing to shield the user and the line of sight. The action may be removed in the field for inspection, cleaning or repair, without the need for tools.

Firing system for a firearm

An improved muzzleloading firearm having a novel safety system. The safety system utilizes a spool coupled to a compression spring to maintain an ignition system such as a primer out of potential contact with a firing pin, even in the event of unintentional actuation of a hammer or sear. The safety system is automatic in operation, automatically placing the ignition system within reach of the firing pin when the firearm is placed into battery.

Retractable face safety for a firearm

A firearm having an improved action for a muzzleloading firearm which allows the toolless field removal of the firing system for inspection, cleaning and repair. The system provides for quick release, removal and reinsertion of the firing system while maintaining safe and secure operation of the firearm during firing.

Action release for a muzzleloader

A method of measuring dynamic air pressure on a ground surface beneath a negative air system which is comprised of a rotatable negative air pressure element with a deck unit having a top with side walls and an open bottom involves placing the system on an elevated horizontal platform located in spaced relation to the deck. The system is then made operative. Measurements are then made of the air pressure at a plurality of locations adjacent the platform to determine if the air pressure at such locations is such that predetermined values are met. The apparatus for performing the aforesaid method has a horizontal platform with a plurality of apertures therein. The platform is adapted to support the negative air system. A plurality of air pressure sensors are mounted in spaced locations on the platform and are located in the lower end of hollow extending tubular pressure taps. The sensors are operatively connected to a monitor to permit the dynamic air pressure to be read adjacent each aperture when the operating negative air system is placed on the platform over the apertures.

Method and means for measuring dynamic and static air pressure on a

A method of measuring dynamic air pressure on a ground surface beneath a lawn mower system which is comprised of a rotatable horizontal blade with a deck unit having a closed top with side walls and an open bottom involves placing the mower on an elevated horizontal platform located in spaced relation to the deck. The blade is then rotated at a speed at which the blade normally would cut grass. Measurements are then made of the air pressure at a plurality of locations adjacent the platform to determine if the air pressure at such locations is such that a blade of grass at each location would be lifted or depressed with respect to the platform. The apparatus for performing the aforesaid method has a horizontal platform with a plurality of apertures therein. The platform is adapted to support a lawn mower deck with a rotatable horizontal blade mounted therein. A plurality of air pressure sensors are mounted in spaced locations on the platform and are located in the lower end of hollow extending tubular pressure taps. The sensors are operatively connected to a monitor to permit the dynamic air pressure to be read adjacent each aperture when a lawn mower with a deck and a rotating blade within the deck is placed on the platform over the apertures.

An apparatus for preventing the transmission of vibrations from one object to another including a first and second frame having a rod attached to one of the frames and the other being slideably mounted to the rod. An air bag or other force transmitting mechanism is attached to one end thereof to one of the frames and abuts the other of the frames. A source of fluid is provided for pushing the first and second frames apart when such fluid is allowed to flow into the force transmitting apparatus. A biasing structure is provided for causing the frames to move closer together when fluid is allowed to escape from the force transmitting apparatus and a valve structure is connected between the fluid supply and force transmitting apparatus for selectively controlling the flow of the fluid between the air bag, a source of pressurized fluid and atmosphere. A third frame, a second rod, a second force transmitting apparatus, biasing apparatus and valve and valve actuating mechanism are also provided for isolating transmissions of force in a similar fashion, but in a direction transverse to the direction of movement of the first and second frame referred to immediately above.

Growing community of inventors

Ames, IA, United States of America

Jerald M Vogel