Patent GB-189702054-A (GB)
Title: Improvements in Forging and like Machines.
Inventor: RICE CHARLES DELOS
Filed: 1897-01-26
Granted: 1897-05-22
Abstract: 2054. Rice, C. D. Jan. 26. Forging; stamping. -Relates to machines for forging or stamping small articles provided with two holding-dies and two end upsetting - dies which force the metal into all parts of the holding-dies. The billet or blank is placed in a stationary die contained in a holder C, and the other holding- die mounted in a slide C<3> is brought up by hand. A cam C<8> on a shaft B, acting on a roller C<7>, rocks a shaft C<5>, so that the frame C<4> and link C<6>, forming a toggle, actuate the slide C<3> with its die to compress and tightly hold the blank. The two side slides D with the end dies are then operated by eccentrics D<3>, rods D<5>, slides D<6>, and links D<7> to upset the blank. The slides D are first withdrawn slowly and, after they are disengaged from, but before they are fully clear of, the forging, the slide C<3> is withdrawn so that the dies in the slides D hold the forging while the die in the slide C<3> is stripped off the forging. Fingers E<1>, attached to shafts E rocked against the action of springs E<2> by lips on brackets E<7> attached to the slides D engaging teeth on rods E<4> connected to cranks E<3> on the shafts E, may be used to eject the work from the stationary die. Inclines on the rods E<4> moving over rollers E<10> on the frame of the machine lift the rods E<4> clear of the brackets E<7>. To place the blank properly and temporarily hold it in the stationary die, a gauging-finger F<1> and holding-fingers F may be employed. These fingers are carried by an L-shaped piece F' secured to a pivoted arm F<3>, and are swung upwards clear of the work, as the slide C<3> advances, by a stop F<5> on the frame C' acting on a rod F<4> which abuts against the arm F<3>. The m a i n shaft B is driven through any suitable clutch mechanism, so that it is brought to rest after each complete cycle of operations or every rotation of the shaft. Fig. 8 shows one form of clutch mechanism. A key H sliding in a recess B<2> in the boss B<1> is normally pressed by a spring to engage a recess G<9> in a ring G<2> loosely mounted on the hub G<1> of the constantly-driven flywheel G. The ring G<2> and flywheel are provided with opposing driving-surfaces between which metal sheets G<7> are inserted. The ring Q<2> is also connected to the flywheel by a pin Q<3> entering a recess in the ring. The key H is withdrawn by the wedge-shaped end of a slide I' normally held in position by a spring I<9>, and the shaft B is arrested by a brake shoe M coming in contact with an inclined band M'. In order to leave the key H in engagement, a tripping-blade L on a bell crank P is moved by treadle mechanism into the path of a pin L' on the flywheel and acts through links I<6>, P to withdraw the slide I' clear. In the preferred form of clutch mechanism shown in Fig. 18, the constantly-driven flywheel C<lx> has a friction surface to engage a wheel B<12> keyed on the shaft A". The friction surfaces are normally kept apart by springs in the hub C<12> pressing a ring D<11>, connected to the hub C<12>, against the wheel B<12>. The friction surfaces are engaged by admitting hydraulic pressure through the pipe G<12>, central chamber a<1>, and passage a<2> to the cylinder H", forcing the piston I" to press against a ring C<21> attached to the hub C<12>. E<12> and J" are grease cups. The wheel B" is brought to rest when the clutch mechanism is disengaged by brake jaws K<11>, K<12> closed to grasp a segmental plate B<21>, by admitting hydraulic pressure to the cylinder K<31> on the fixed jaw. The cylinders H<11> and K<31> are alternately put into communication with the pressure supply and exhaust by a three-way valve N operated by the arms n<1>, n<2>. A pin a<21> on the shaft A<11> acting on the arm n<3> moves the valve to supply water to the cylinder H" and open the cylinder K<31> to exhaust. A rod R reciprocated by a constantly-rotating disc R<1> carries a tappet r which is normally held clear of the arm n<1> by a spring R<5> attached to the slide R<3> of the lower guide R<2> of the rod R. The lower end of the rod R is drawn inwards by a treadle and rod r<3>, so that the tappet r strike3 the arm n<1> to move the valve N and supply water to the cylinder K<31> and open the cylinder H" to exhaust, thereby throwing the clutch mechanism out of and the brake into action.