US2457709A - Jig bushing - Google Patents

Description

Dec. 2s, 194s. y

' A.`H. NOLDE JIG BUsHING Filed Aug. 11, 1945 Arhu' z H. Noida v INVENTOR.

ATTURNEY.

Patented Dec. 28, 1948 .TIG RUSHING Arthur H. Nolde, Wauwatosa, Wis., assigner to The Falk Corporation, Wauwatosa, Wis., a corporation of Wisconsin' Application August 11, 1945, Serial No. 610,231

3 Claims.

This invention relates to jig bushings for use in guiding drills, taps, reamers and like tools.

Bushings for this purpose commonly include a cylindrical sleeve or liner usually iixed in a jig and constituting a support for a replaceable guide bushing adapted to be closely fitted and removably iixed therein.

One object of the present invention is to provide an improved simple and inexpensive means for releasably retaining the guide bushing within the liner.

Another object is to provide a retaining means of the character mentioned which will permit reversal of the guide in the liner and thus permit insertion of the guide from either side of the jig.

Other more specific objects and advantages will appear, expressed or implied, from the following description of an exemplification of the invention.

In the accompanying drawings- Figure 1 is an exploded View in perspective of a jig bushing constructed in accordance with the present invention.

Fig. 2 is a longitudinal sectional View of the assembled bushing.

Fig. 3 is a View in side elevation.

Fig. 4 is a View in side elevation, partly in section, illustrating the method of assembling the bushing.

The jig bushing shown comprises a liner I adapted to be fixed in a jig (not shown) and a replaceable guide bushing II adapted for insertion in the liner. The guide bushing is equipped with the usual supporting end flange I2 adapted to seat upon an end of the liner to position the bushing therein.

In this instance the guide bushing II is provided with a locking pin in the form of a stud I3 fixed in the wall thereof and projecting radially therefrom. The stud Iis positioned to engage in a circular opening III provided in the wall of the liner I0 when the bushing and liner are assembled, as indicated in Figs. 2 and 3. A longitudinal groove I5, formed in the interior of the liner III and extending from end to end thereof and through the opening III, provides a passageway through which the stud I3 is entered into the opening I4 as the bushing is entered into the liner as indicated in Fig. 4. The opening I4 is somewhat wider than the groove I5, so that upon slight rotation of the bushing within the liner, either by manual manipulation or by the action of the rotating tool guided by the bushing, the stud I3 assumes a position offset from the groove I5 and thus prevents accidental withdrawal of 2 the bushing from the liner during withdrawal of the tool from the bushing.

The stud I3, groove I5 and opening I4 thus provide an effective, yet inexpensive, means for releasably retaining the guide bushing II within the liner I0, the opening I 4 being formed by a simple drilling operation, the groove I5 being formed by a simple broaching operation, and the stud I3 being press fitted into a simple drilled hole in the bushing.

The opening I 4 is preferably positioned midway of the length of the liner I0 and the stud I3 is correspondingly positioned in the bushing II, so that the bushing may be entered through either end of the liner and, regardless of the direction of entry, the stud and opening will coact to releasably retain the bushing in the liner.

Various changes may be made in the embodiment of the invention hereinabove specifically described without departing from or sacricing the advantages of the invention as dened in the appended claims.

I claim:

l. In a jig bushing the combination of a liner member, a bushing member adapted for insertion in said liner member, a stud projecting from one of said members, an opening in the other of said members for coaction with said stud to releasably retain said members against separation, and a longitudinal groove extending through said last named member and opening through which said stud is admitted to said opening upon insertion of said bushing member into either end of said liner member, said opening being wider than said groove.

2. In a jig bushing the combination of a. liner, a guide bushing for insertion in said liner for support thereby, a stud projecting from said bushing, said liner having an opening therein adapted to receive and to coact with said stud to releasably retain said bushing in said liner, and a longitudinal groove extending through said liner and opening through which said stud may be admitted to said opening through either side thereof, said opening being disposed substantially midway of the length of said groove and extending beyond the sides thereof.

3. In a jig bushing the combination of a liner, a guide bushing for insertion in said liner for support thereby, said bushing having an end shoulder for coaction with said liner to position said bushing therein, a stud projecting from said bushing, said liner having an opening for receiving and coacting with said stud to releasably retain said bushing in said liner, and a groove extending lengthwise through said liner and through said opening to permit passage of said stud. into said opening, said opening being dis" posed midway of the length of said liner and groove so as to receive and coact with said stud regardless of the direction of entry of said bushing into said liner.

' 'l ARTHUR 12013D1131.4

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

5 UNITED STATES PATENTS Number Name Date 1,465,236 Briney Aug. 14, 1923 1,587,5M Briney June 8, 1926 10 1,660,190 Fisher Feb. 21, 1928 1 11,706,847 Fisher Mar. 26, 1929 1,748,006 Wohlart Feb. 18, 1930 OTHER REFERENCES american Machinist, May 29, 1924, page 827, 15 pub, by McGraw-Hm Pub. co., 33o W. 42nd Street, New York, New York.

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