Chuck assembly

Claim 2

A chuck jaw for an automatic pipe chuck, said jaw being of generally spearhead shape in front elevation and being symmetrical about a longitudinal axis, said jaw including two arcuate edge surfaces meeting in a point, said jaw having a rearwardly extending tongue for rotating said jaw, said jaw further having a central pivot opening near the base of said tongue, said jaw having four rows of teeth, a pair on each edge surface with each pair spaced apart a distance not less than the width of one of the rows, each of said teeth being inclined toward the point of said jaw, said teeth also slanting rearwardly from the point toward the center of the space between the rows, said teeth near the point in several rows further being grooved to form separate work-engaging tip teeth, and said teeth of each row being higher on the inside at the rear thereof and higher on the outside at the point thereof.

Claim 3

A chuck assembly comprising a plurality of chuck jaws, each having an inner end, an intermediate hole, and a single tongue extending outwardly therefrom and terminating in a single transverse tang extending from one side of said tongue, the inner end of each of said jaws having an arcuate surface terminating at a point, said arcuate surface having two rows of teeth spaced apart with a groove therebetween, at least a majority of the teeth in each of said rows varying uniformly in height from one end to the other and being symmetrical about a plane taken centrally through the groove, a jaw driving plate having a central passage and a hub therearound and further having a plurality of substantially radially extending grooves, one for each of said jaws, a jaw mounting ring rotatably carried on said hub around said central passage, said mounting ring having a plurality of openings, one for each of said jaws, uniformly spaced therearound, a brake disc having a central opening therein and having an outer braking surface, said brake disc having a plurality of openings, one for each of said jaws, equally spaced apart and at a common distance from the center of said central opening, and fasteners extending through said brake disc openings, through said intermediate holes of said jaws, and into said mounting ring openings to mount said brake disc and said jaws on said mounting ring with said jaw tangs received in said radial grooves of said driving plate.

Claim 4

A chuck assembly comprising a plurality of chuck jaws, each having an inner end, an intermediate hole, and a single tongue extending outwardly therefrom and terminating in a single transverse tang extending from one side of said tongue, the inner end of each of said jaws having an arcuate surface terminating at a point, said arcuate surface having two rows of teeth spaced apart with a groove therebetween, at least a majority of the teeth in each of said rows varying uniformly in height from one end to the other and being symmetrical about a plane taken centrally through the groove, a jaw driving plate having a central passage and a hub therearound and further having a plurality of substantially radially extending grooves, one for each of said jaws, a jaw mounting ring rotatably carried on said hub around said central passage, said mounting ring having a plurality of openings, one for each of said jaws, uniformly spaced therearound, a brake disc having a central opening therein and having an outer braking surface, said brake disc having a plurality of openings, one for each of said jaws, equally spaced apart and at a common distance from the center of said central opening, and fasteners extending through said brake disc openings, through said intermediate holes of said jaws, and into said mounting ring openings to mount said brake disc and said jaws on said mounting ring with said jaw tangs received in said radial grooves of said driving plate.

Claim 5

A chuck assembly according to claim 2 characterized by the teeth of each of said jaws near the point of each row being higher on the outside and the teeth at the rear of each row being higher on the inside, and each of said fasteners including a threaded end threadedly engaged in one of said mounting ring openings, a shoulder adjacent said threaded end and abutting said mounting ring, and an enlarged head abutting a portion of said brake disc.

Claim 6

A chuck jaw for a pipe chuck assembly, said jaw having an arcuate surface at one end thereof terminating at a point, said arcuate surface of said jaw having two rows of teeth spaced apart with a groove therebetween, said jaw further having a rearwardly extending tongue, and a tang extending outwardly from one side of said tongue for rotating said jaw, at least a majority of the teeth in each of said rows varying uniformly in height from one end to the other end and being symmetrical about a plane taken centrally through the groove, with the teeth near the point of each row being higher on the outside and the teeth at the rear of each row being higher on the inSide.

Claim 7

A chuck jaw for a pipe chuck assembly, said jaw having an arcuate surface at one end thereof terminating at a point, said arcuate surface of said jaw having two rows of teeth spaced apart with a groove therebetween, said jaw further having a rearwardly extending tongue, and a tang extending outwardly from one side of said tongue for rotating said jaw, at least a majority of the teeth in each of said rows varying uniformly in height from one end to the other end and being symmetrical about a plane taken centrally through the groove, with the teeth near the point of each row being higher on the outside and the teeth at the rear of each row being higher on the inSide.

Claim 8

A chuck jaw according to claim 4 wherein several of the teeth near the point of the jaw are notched to further subdivide the teeth into separate work-engaging portions.