1
Donald L DeVall: Impact measuring game ball. Gary J Morris, September 25, 2007: US07273431 (51 worldwide citation)

A game ball is instrumented with a transducer to measure the impact forces on the ball and/or the decelerations by the ball experienced during an attempted catch by a person. The impact forces on the ball are equal and opposite to the forces on the hands of a person catching the ball so that the bal ...


2
Donald L DeVall, Hu D DeVall, Clarence L Tennant: Apparatus for repairing chains. Webb Burden Robinson & Webb, March 26, 1985: US04506501 (15 worldwide citation)

Apparatus for repairing a section of chain having a closed rectangular frame and a hydraulic ram located within the confines of the frame. The frame has a pair of spaced parallel side rails, a front end member connecting one end of the side rails, and a rear end member connecting the other end of th ...


3
Donald L DeVall, Hu D DeVall: Rotary valve. Webb Burden Robinson & Webb, October 23, 1984: US04478248 (11 worldwide citation)

A rotary valve having a housing with a center section and a pair of end sections attached to the center section. A rotary shaft extending axially through the center section into said end sections with bearings in each end section rotatably supporting an end of the shaft. The center section and the e ...


4
Albert Phillips, Donald L DeVall, Hu D DeVall: Drill head assembly. Stanley J Price Jr, John M Adams, November 22, 1983: US04416337 (8 worldwide citation)

A drill housing includes an internal cavity for receiving a unitary tubular support member rotatably supported by bearing assemblies in the drill housing. The tubular support member is connected through meshing gears to a drive shaft of a rotary motor mounted externally on the drill housing. An uppe ...


5
Donald L DeVall: Reamer bit. Price & Adams, April 7, 2009: US07513319 (6 worldwide citation)

A drill steel includes a drill bit and a reamer bit. The drill steel rotates the drill bit to form a hole in a work surface and drives forward to insert the reamer bit into the hole. The reamer bit includes a plurality of inserts positioned on a cylindrical drilling surface to ream out the hole by c ...


6
Donald L DeVall: Drill bit. Price & Adams, June 12, 2007: US07228922 (6 worldwide citation)

A drill bit has a pair of cutting teeth with cutting elements extending from a cutting end portion of the drill bit. Each cutting tooth extends radially, outwardly parallel to a longitudinal axis of the drill steel. The cutting teeth are juxtaposed with one another on the longitudinal axis. Each cut ...


7
Donald L DeVall: Drill head assembly. Price & Adams, April 21, 2009: US07520341 (2 worldwide citation)

A drill housing rotatably supports a shaft having an internal cavity for receiving a drilling device, such as a drill steel, bolt driver, and rock anchor adaptor. The upper end of the housing is closed by a cover plate and a flinger having an opening for receiving pressurized fluid and a passageway ...


8
Donald L DeVall: Drill head assembly. Price & Adams, February 24, 2004: US06695071 (2 worldwide citation)

A drill head for holding a drill steel includes a drill housing having an internal cavity defined by an upper opening and a lower portion with a lower opening extending therethrough. The internal cavity includes a pair of concentric axially aligned sleeves. An internal sleeve has an inner surface fo ...


9
Donald L DeVall: Drill head assembly. Webb Burden Ziesenheim & Webb, March 23, 1993: US05195598 (1 worldwide citation)

An improved rotary drill head assembly including a drill head cover having an upper portion, a rotatable drill retaining socket having an outer surface and a support member having an upper portion. The socket extends above the support member. A flinger attached to the upper portion of the support me ...


10
Donald L DeVall: Reamer bit. Price & Adams PC, November 1, 2007: US20070251727-A1

A drill steel includes a drill bit and a reamer bit. The drill steel rotates the drill bit to form a hole in a work surface and drives forward to insert the reamer bit into the hole. The reamer bit includes a plurality of inserts positioned on a cylindrical drilling surface to ream out the hole by c ...