US2331555A - Locking device - Google Patents

Description

Oct. 12, 1943. R. .Jos-HCH, JR., Erm. 2,331,555'

LOCKING DEVICE Filed June 2l, 1940 lIhwentors' 4 (Ittomegc u Patented Oct. 12, 1943 UNITED STATES PATENT ortica LocKmG DEVICE Rudolph Jostich, Jr., and Eugene J. Phillips, Detroit, Mich.

Application June 21, 1946, Serial No. 341,600

3 Claims. y, (C1. 29-105) vide a new and improved holder or locking mem ber for Yholding or locking a tool to a body or carrier to insure against movement of the tool relative to said body or carrier,

Another object of the invention is to provide a new and improved holder or locking member constructed to exert forces in several directions to insure rigidly securing a tool to a body or carrier.

Another object of the invention is to provide a new and improved holder or vlocking member constructed to expand peripherally and also to move rectilinearly in holding a tool to a body or carrier.

A further object of the invention is to provide a holder or locking member for the abovementioned purpose which is efficient for the purpose intended and one which is inexpensive to manufacture. f y

Other objects of the invention will become apparent from the following detailed description taken in connection with the accompanying drawing in which- Fig. 1 is a top plan view of the holder or locking member;

Fig. 2 is a vertical central sectional view of the holder shown in position to hold a tool to a body or carrier therefor;

Fig. 8 is a fragmentary top plan view of the tool body or carrier; and

Figs. 4 and 5 are views respectively similar to Figs. 1 and 2 showing a, modified form of tool holder or device.

Referring to the drawing by characters of reference and first to Figs. 1, 2 and 3, the numeral I designates generally a body or tool carrier having in a wall lila thereof an openingl I to receive a tool I2 which may be a cutting tool or any other tool or element to be releasably and rigidly held to the body Il). The tool I2 may have a serrated portion I4 for increasing its grip ping power. As shown in Fig. 3, the tool receiving opening I I is in the form of a slot which may extend through one end IIa of the body I0, the slot II providing a flat side wall surface I3@ against which one side of the tool I2 is held. Also in the wall Ia a, recess I3 is provided which intersects the slot II, the recess I3 having a cylindrical side wall portion I 5. In the recess I3 there is a holder or locking member I6 for holding the tool rigidly to the body It! against the wall I 3a of the slot II.

` The outer wall surface or periphery of the locking member I6 conforms or is complementary to the cylindrically shaped portion I5 of the recess I I, the locking member I5 having a cylindrically shaped portion Il and a attened wall portion I8 of which the latter is arranged to engage the inner at side of the tool I2.

A threaded, tapered bore 2li is provided through the locking member I6, the axis of the bore 20 extending longitudinally of but 01T center or, Yeccentric with respect to the axis of the cylindrical portion I1 of the locking member. Preferably at the narrowest part of the wall of the bore 2B, the locking member I6 is split by the provision of a slot 22 which extends longitudinally of and preferably coextensive with the bore 20, Serewthreaded into the bore 2li there is a tapered "screw 23 'which when tightened down "causesl peripheral expansion of the locking member I6, which expansion is permitted by reason of thesplit or slot '22. This peripheral expansion of the locking-member I6 is illustrated by the dot and dashy lines 24. To provide desired peripheral expansion of the locking member IS, a second slot 25 preferably diametrically opposite the slot 22 is provided, this second slot extending toward but not running out of the attened wall portion I8 of the locking member I6.

In operation, it will be seen that when the screw 23 is tightened down it will expand the locking member IS peripherally, as illustrated by the dot and dash lines 24, and that the at wall I8 of the locking member will be deformed, as indicated by the dot and dash line I8a, with the result that the locking member I6 will force the tool I2 laterally or to one side against the wall I3a to secure the tool rigidly to the body or tool carrier IB. As the tapered screw 23 is tightened down the bore 28 is deformed such that cross sectionally it is of general elliptical form as indicated by the dot and dash lines 2da. This results in a four point Contact between the screw 23 and the wall of the bore which points of contact are designated A on the drawing. Ths four point contact is obtained by reason of the provision of the slots 22 and 25 and insures against loosening of the screw 2i?.

Referring now to the modification shown in Figs. 4 and 5, the body I0' is similar to the previously described body Il but differs therefrom in that the wall I3 is angularly disposed, the wall I3' and the axis of the nut 22 tendingto converge upwardly, as seen on the drawing.

Opposed to and spaced from the angularly disposed wall I3', the wall I8' of the locking member I5 is similarly angularly disposed and, consequently, the portion of the tool I2 held between walls I3 and I8 is angularly disposed with respect to the axis of the screw 23. In this form of locking member, a lower end portion 2G of the screw 23 seats against the recessed wall 21 of the opening or recess Il in the body Hl. As a result of the above arrangement, when the screw is tightened down, the locking member I6 is expanded thereby to urge the tool outwardly against the body wall I3 and in addition, by reason of the screw 23 engaging the wall 21, the locking member I6 is urged upwardly relatively to the body I. This combined peripheral expansion and upwardly or rectilinear movement of the locking member I6' results in a wedging action of the tool between the wall surfaces I3 and I8 providing for rigidly securing the tool I2 to the body ID'. As in the previously described lock lli, the at wall I8 of the lock I6 is deformed, as illustrated, upon expansion of the lock and the screw 22 grips the wall of the bore at the points A'.

While we have sho-wn and described our invention in some detail it is to be understood that the same is to be limited only by the appended claims for many changes may be made without departing from the spirit and scope of the invention.

What we claim is:

l. In a tool holding device, a body having an opening to receive a tool and a partially circular hole extending into said opening, a holder positioned in said hole and having a cutaway portion positioned to engage and hold the tool to said body, said holder having a tapered threaded bore, a pair of diametrically opposite slots in the wall of said bore and extending longitudinally thereof, one of said slots extending through the wall of said bore and through the outer Wall of said holder, said pair` of slots being directed substantially perpendicularly to said cutaway portion providing for peripheral expansion of said holder, and a tapered screw in said bore to hold said holder expanded.

2.y In a tool holding device, a body having an opening to receive a tool and a partially circular hole extending into said opening, a holder positioned in said hole to engage and hold the tool to said body, said holder having a partially cylindrical outer surface portion and also having a cutaway portion for engaging the tool, slots in said holder directed substantially perpendicularly to said cutaway portion and extending longitudinally of the axis of said cylindrical portion, a threaded bore in said holder with its axis disposed eccentrically of the axis of said holder toward the side thereof remote from said cutaway portion and extending longitudinally of said slots, at least one of said slots extending through the outer periphery of said holder and into said bore to provide for peripheral expansion of said holder, and a tapered screw in said bore to expand said holder and urge the tool tightly against said body.

3. In a tool holding device, a body having an opening to receive a tool and a partially cylindrical hole extending into said opening, the wall defining said opening having a flattened portion Q5 for abutment by the tool and angularly disposed with respect to and extending longitudinally of the axis of said cylindrical hole, a holder positioned in said hole, said holder having an outer cylindrical wall surface portion and having a cutaway portion opposed to said flattened portion and engaging the opposite side of the tool, said cutaway portion being angularly disposed with respect to the axis of said cylindrical holder portion and extending substantially parallel with said liattened portion, slots in said holder directed toward said cutaway portion and providing for peripheren expansion thereof to force the tool laterally, a threaded bore through said holder with the axis of the bore extending longitudinally of the axis of said cylindrical holder portion and disposed eccentrically thereto, and a tapered screw in said bore to expand said holder and also acting to urge said holder longitudinally of the axis of said bore to aid in wedging 45 the tool between said holder and said body.

RUDOLPH JOSTICH, JR. EUGENE J. PHILLIPS.

Images