Common devices for gripping articles comprise the ordinary vice, tongs,
pincers, pliers, joiners’ handscrew, cramp bench screw, parallel vice,
instantaneous grip vice, &c.
=488. Hollow chuck,= with radial knives, for rounding wood rods. See
also No. 458.
=489. Barber’s patent= grip for shanks of drills, brace bits, &c.,
having square taper shanks.
=490. Collar grip= and bolt, or set screw.
=491. Cone and screw lever grip,= with two or more jaws; with two jaws
only it serves as a small vice.
=492. Taper grip= for vices.
=493. Tool box,= for lathes, planing machines, &c., with central
revolving tool post and set screw.
[Illustration: 480.-496.]
=494. Tool box,= with two tool stocks and set screws sliding in ~T~
grooves in the slide rest.
=495. Tool box,= with clamping screw and plate, which can be revolved to
any angle.
=496. A modification of 495,= the tool being secured by set screws in
the clamping plate.
=497. Rail grip= for holding a crane, car, &c., down to its railway.
=498. Cam-lever rail grip= for safety gear on inclines; this is usually
thrown into action by a spring released by the breakage of the hauling
rope.
=499. Cone centering grips= for machine tools.
=500. Hinged clamp,= with screw and nut.
=501. Fitter’s clamp or cramp.=
=502. ~V~ grip vice= for round rods and tubes. This is frequently made
with multiple ~V~’s to hold cylindrical articles such as drills, &c.,
and is a common device for drill chucks.
=503. Lathe carrier,= for round rods, spindles, &c.
=504. Bench cramp;= employed to hold down to the bench work operated
upon; the bench has a series of holes bored in it to receive the
vertical leg of the cramp.
=505. Grip tongs,= used for draw benches, &c., the bite of the jaws
increasing with the strain on the chain.
=506. Split cone expanding chuck= for rods, &c.; the centre cone is
split into three or four parts, and the screwed ring or collet contracts
the split cone upon any cylindrical article inserted in the central
aperture.
=507. Le Count’s patent expanding mandril,= with cone and three sliding
feathers which are fitted into dovetail grooves in the conical mandril.
The travel of the feathers being limited, they are provided with steps
to take various sizes of holes.
=508. Bell chuck= and set screws for lathes.
=509. Three jaw grip,= or stay bearing, used as a steady for long shafts
or spindles.
=510. Pipe tongs,= self gripping; there are several modifications in
use.
=511. Paper grip,= used for holding sheets of paper; released by
striking a stop ~A~ at any point in the travel of the machine.
[Illustration: 497.-511.]
=512. Split bar grip,= or tool holder.
=513. Eye-bolt tool holder.=
=514. Hand pad= for holding small tools.
=515. Self-adjusting jaws= for round articles.
=516. Adjustable gripping tongs= for lifting heavy stones, boxes, &c.
See also No. 761.
=517. Revolving tool post, or head,= to carry a variety of tools, each
being required in use in a certain order, as in special repetition
turning work.
=518. Double screw gripping tongs.=
See also No. 944, 912, 918, 917, 919, 923.
The ordinary three or four-jaw chucks, wood chucks with centre screw
or fork, and numerous varieties of self-centering chucks, are well
known. See tool makers’ lists.
Spindle grips, Nos. 917, 918, 919.
There are numerous forms of three and four-jaw chucks, both with
universal or centering motions, and with independent jaws. See
Horton’s, Cushman’s, the Sweetland, Pratt and Whitney’s, Westcott’s
and others, chiefly American.
These are various combinations of the scroll (No. 1384) and screw
jaws, as in the ordinary dog chuck. See also Nos. 1378 and 1381.