US2509990A - Tool ejector - Google Patents

Description

May 30, 1950 o. E'. scHAUl-:R

TOOL EJECTOR Filed Feb. 7, 1950 lllll/ INVENTOR. om E, Sr/QAM @gw/ @9kb/m1 ATTORNEY Patented May 30, n1950 UNITED STATES PATENT oFFlcE Q TOOL EJ ECTOR Ozni E. Schauer, Cincinnati, Ohio, assignorrto The Cincinnati Bickford Tool Company, Oakley, Cincinnati, Ohio, a corporation of Ohio Application February 7, 1950, Serial No. 142,767

3 Claims. l

This invention relates to automatic mechanisms known as tool ejectors of which a variety has hitherto been proposed and in part marketed. In such mechanisms the tool has a tapered shank which is mounted in a tapered bore at the end of a spindle; the bore being longer than the tool shank. In the initial nonautomatic construction, a cross-slot was provided so that the tool could be forced out by laterally driving in a wedge or drift which, by contact, with the extreme end of the tool, would displace it suinciently to loosen it in its socket. This consumed time and tended to batter the end of the tool.

In certain of the subsequent automatic types, a camming-lever was arranged in a suitableY space in the spindle and pinned to the side walls of the space; the pin acting as a xed pivot about which the lever could be swung so as to bring a camming contour thereof into sliding contact with the tool and forcibly eiect its release.

The objective of the present arrangement is to avoid all pivot pins, which are a source of weakness and some trouble to make and assemble, and in lieu thereof to provide a rocker so shaped that it requires only to be slipped in place, and which, inherently, will be more sturdy and reliable.

In the drawings, Figures 1 and 2 are similar vertical sectional assemblies; the rst showing the normal relation of the parts, and the second showing the rocker tilted to discharge the tool. Figure 3 is a horizonal cross-section through plane A-A of Figure 1.

The spindle I, which is conventionally mounted for rotation and translation in the machine frame, has the customary taper socket 2 which extends, at its upper end, from a narrow crossslot 3. Normally, the taper-shank 4 of the tool 5, is seated in said socket and has the usual ilat end E terminating midway the ceiling 'I and floor 8 of the slot.

Occupying this slot, is an L-shaped rocker A; the foot Ill of which is curved at its toe I I to rest on the oor of the slot at one side of the space occupied by the tang 6 of the drill, the heel I2 of the foot likewise bears, or nearly so, on the ceiling and is curved so that the rocker may be rocked while maintaining the said relation.

The leg 9 of the rocker serves the dual purpose of enabling the rocker to be tilted and also of pushing the tang of the tool to free it. This leg extends transversely and occupies the upper half of the slot and terminates at I2 to protrudel somewhat beyond the periphery of the spindle.

The means for operating the rocker is a col-"j lar B which tsaround the spindle and is caused to rotate therewith but may be vertically shifted W thereon; a key I3 secured by a screw I5 and# slidable in a spline-groove I4 in the spindle'pro This collar B is provided-U the rocker A will be caused to press againstV the tang to release the tool.

The upper or normal relation of the collar to` the spindle is maintained by a spring interposed between a flange I8 provided on the spindle and shoulder I9 of the collar. This relation is maintained during the translations oi' the spindle within its working range i. e. below the position shown by Figure 1.

To eject the tool, however, the spindle with its collar is further raised. This ilrst brings the flange 20 of the collar impacts against a stationary portion 2l of the frame or head which. arrests its further upward travel. The spindle, however, can continue and the collar, in eiect, slides thereon; the spring I1 being compressed until the ultimate position as indicated by Figure 2 is attained.

The rocker A is thereby tilted down against the top of the tang and the tool is thus loosened in its socket and can be entirely withdrawn. During this tilting, the heel and toe of the foot shift laterally somewhat by reason of the contact at 22 of the sole of the foot against the side wall of the collar.

The rocker is thus in the nature of a, floating element and, begin devoid of any pivot pin, constitutes a sturdy construction capable of enduring long-life usage. As will be perceived, the pressure of the collar is compounded at the tang and furnishes adequate pressure to release the tool in its socket.

I claim:

1. A tool ejector comprising a spindle having a taper bore opening into a transverse slot; -a taper shank tool within said bore and having its tang in said slot; an L-shaped one-piece rocker with said slot and having the toe of its foot normally resting on the floor of the slot and its heel closely contiguous to the roof of the slot, said rocker having a leg extending diametrically through the upper region of said slot and extruding somewhat beyond the periphery of the spindle; a. col- 2. A tool ejector comprising a spindle having ar taper bore opening into a transverse slot; la taper shank tool within said bore and having a tang extending into said slot; an L-shaped one-piecev rocker within said slot with the toe of its foot normally resting on the floor of the=slot and with its heel closely contiguous to therroof of the slot, said rocker having a leg extending diametrically through the upper region of said slot andi extruding somewhat beyond the' periphery of the spindle; a; collar; slidablyA mountedon said spine-1V dle and-,engagingthe extremity oftherocker leg` and normally maintained in its uppermost position:vr relative tol saidspindle by a stop on said spindle; a stationaryframe-member adapted to befabutted by aV ange provided by4 said collar to.' limit its upward travell with said spindle and causersaid collar to tilt the rocker downwardlyV to-bring its heel againstthe roof of said slot and itssole against the inner periphery of the collar toy-bringitsrlegfagainst theftangof the tool.

3.y AA toolI ejector comprising a spindle having a taper boreropening into a transverse slot; a iioating, L-shaped one-piece rocker loosely mounted within said slot and havingfthe toe of. itsv foot. normally resting on the iioor of the slot and its heel closely contiguous to the roof of the slot, said rocker having a leg extending diametrically through the upper region of said slot and protruding somewhat beyond the periphery of the spindle; a collar mounted on and shiftable relatively to said spindle and having a recess containing* thev protruding extremity of the rocker leg; a spring for normally maintainingv said collar in its uppermost position relative to said spindle against a stop provided by the spindle; a stationary frame-member adapted to be abutted against a flange provided by said collar to arrest its upward travel when said spindle has been raised beyond its normal working-range and cause said collar downwardly to tilt the rocker to bring its heel against the roof of said slot and its leg against the top of said tang.

OZNI E. SCHAUER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 794,039- VNelson July 4, 1905 1,159,326 Mundy Nov. 2, 1915 1,405,921 Kipniss Feb. '7, 1922 1,414,460 Dixon May 2, 1922 1,702,810 Bunr Feb. 19, 1929- OTHER REFERENCES LaRue: American Machinist; of Julyr6, 1922, page/29. (Copy in Division 52.)

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