GB190815048A - Improvements in and relating to Bolt-screwing Machines. - Google Patents

Abstract

15,048. Hill, A. J., and McDermid, W. F. July 15. Screwing.-In an automatic machine for screwing bolts of the type in which a rotary work turret is mounted on a slide, the motion of the slide is controlled by a crank disk or the like rotated by a pawl, which is put into engagement with a continuously revolving ratchet-wheel &c. by the movements which open and close the screwing-dies. A ratchet-wheel a mounted on a shaft a<1> rotates a drum f by engaging a spring pawl e, the drum rotating a cam, eccentric, or crank d through mitre-gear g. The axes of the crank and ratchetwheel may be in line. Overrunning is prevented by the provision of a ratchet-wheel f Fig. 4, on the drum engaging a pawl a<2> on the ratchet a. The crank may be of adjustable throw, or it may be connected to the slide u by an adjustable rod m, a rod k, and a lever l having a slot l<3> to take the rod k. When cams are employed the connecting-rod is replaced by rods provided with rollers and sliding in guides. The crank is set in motion when the screwing-dies are opened through tappets and links j<2>, j<3>, j<1>, j, which, through a rod h<1> and links h<2>, move the roller stop h out of contact with the pawl e. The slide u is thus moved backwards against the action of a spring in the casing s<1> until the bolts are clear of the dies, when the attachment n to the rod m carrying a roller n' presses down a plunger pawl o or cam, Fig. 3, into contact with an adjustable bar on the machine bed formed with a notch o<5>, at the same time moving the spring pawl p out of contact with the turret. On further motion of the connecting-rod, the attachment n rotates the turret by means of a drag-pawl. Towards the end of the motion of the rod m, a cam on the shaft d<1> acts on a lever k<2> to move the roller h into contact with the pawl and stop the crank d, the dies at the same time being closed, while the attachment n abuts against a stop t, which releases the pawl o from the pressure of the feed-spring. The spring p<1> thus moves the pawl out of contact with the notched bar o' and the pawl p into contact with the turret. The feedspring then returns the slide u. The automatic movements of the parts may be suspended by a cam v operated by a thumb-piece to press down the pawl p, and compress a spring o<3> which forces the pawl o into the notch in the bar. The slots q<6> in the turret may be shaped to engage flats on the bolts, the heads of which are held up to the dies by pieces inserted in the turret. For holding bolts without flats, the bolts are passed through serrated holes in blocks z, Fig. 8, which are fixed in the turret. A rest x provided with clips x<1> may be used to support long bolts. The bolts may be removed from the turret by hand or by a cam or lever on the slide u engaging a stop or roller on the bed. According to the Provisional Specification, overrunning of the ratchet is prevented by a catch on the crank disk or cam.