Other

Southwest Research Institute

John T O'Brien

William T Balogh

A chainsaw starting apparatus comprises a frame, a first crank arm, a second crank arm, and a locking mechanism. The frame is designed to occupy a fixed position relative to a floor surface. The first crank arm and the second crank arm are each rotationally supported by the frame and interconnected to produce rotational movement of one arm upon rotational movement of the other arm. The locking mechanism may be used for releasably attaching a chainsaw to the frame.

Apparatus and method for starting a chain saw

A tubewave damper probe for the suppression of borehole tubewaves in seismic applications is disclosed. The damper probe is suspended into a borehole by means of a cable and is comprised of a housing, a gas-filled bladder within the housing, and a plurality of valves located on the housing. The damper probe operation is based on a modified Helmholtz resonator effect. The bladder is precharged before insertion into the borehole, and pressure variations within the borehole cause the bladder to expand or contract. The valves are designed such that expansion of the bladder causes the valves to close, and contraction of the bladder causes the valves to open. The valves also prevent over-expansion of the bladder.

Tubewave damper probe for seismic applications

Seismic cable shielding method and apparatus. Shielding is obtained by switching unused wire pairs to ground via a roll-along switch which is connected to system ground. Grounding of the unused conductors in the cable is accomplished by ground connections at the roll-along switch. By grounding the unused conductor pairs (all pairs except those required for the sensor signals) within the cable, partial shielding is provided between the active wire pairs and cross-talk is reduced to a negligible level. Additional wire pairs are hardwired to system ground and distributed uniformly throughout the cable cross section to form an interstitial shield.

Shielding for seismic cables

A hydraulic wood splitter including a trackway (57) (157) (225) and a carriage (60) (160) (230) movable therealong, the trackway including a main rail (26) (126) (201), a pair of guide rails (50, 51) (150, 151) (213, 220) parallel thereto and spaced therefrom, and a plurality of spaced splitter elements (80, 81) (180, 181) (210, 211, 212), and the carriage including a ram or rams (74) (124) (235, 236) located at all times between said splitter elements: the carriage is reversibly moved along the trackway by actuating means (34) (134a, 134b) (240, 241) and may include a saddle (161) or a pair of saddles (61, 62) (231, 232) mutually spaced in the direction of the trackway.

Growing community of inventors

San Antonio, TX, United States of America

John T O'Brien