US939457A - Expansion-bolt. - Google Patents

Description

G.' D; 'VERNON am. P. MORNINGSTAR. `*EXPA N BOLT. APPLIOATIGN vD SEPT. 10. 1908.

939,457. y Patented-Nov. 9, 1909.

INVENTDR'..

WITNESS E5:

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' UNITED srn'rns PATENT- OFFICE.

CHARLES D. VERNON AND JACOB P.,MORNINGS TAR, 0F WHEELING, WEST VIRGINIA;

' SAID MORNING-STAR ASSIGNOR T0 SAID VERNON.`

EXPANSION-BOLT.

Specification of Letters ratent.

Patented Nov. 9, 1909.

Application led September 10, 1908. Serial No. 452,467.

T o all whom 'it may concern: i

Be it known that we, CHARLES D. VERNON Bolts, of which the `following is a specifica-- tion.

This invention relates to improvements in expansion bolts, and more particularly to an vexpansion bolt which may be conveniently recovered when occasion requires.I

The primary object of the invention is to provide an expansion bolt which is particularly adapted for use in threaded holes or sockets and which may be readily, removed or recovered from its seated position. A further object of the invention is to provide a device of the character mentioned by means of which a rigid hold may be secured upon a coil-spring, such, for instance, as a trolley-pole supporting-spring, for attachments of parts or objects thereto without unduly weakening the spring. And a still further object of the invention is to provide an expansion `bolt the censtruction y of which is `such that when it has become seated with an expansion hold, itinay beV manipulated to effect the taking up of such slack as may exist.

With these and other important objects in view, the invention finally. consists in the particular construction, .arrangement and combination of parts which will' hereinafter be fully described, reference being had to,

the accompanying drawing, forming a part of this specification, in which-4 l" Figure 1 is a view, partly in'lori'gitudina1' section and partly 1n yside elevation,@illusf`H trating the application'of 'the invention to a spring; Fig.v 2 is a perspective view of the key. employed in connection with the spring;A

Fig. 3 is a view illustrating the bolt as employed for seating in a threaded hole or socket; Fig. 4 is a perspective view of the key employed in such hole or socket; Fig. 5 is a similar view of a slightly modified forni of the key shown in Figs. l and 2'; ande-Fig. 6 is a similar View. of a key still further modified in form. y

Referring to said drawing, in which like reference-characters designato like parts' throughout. the several viewsui indicates a bolt-body having a recess l in one side aisocket, fthe key may have on its sui-face -one.ormorestuds", as shown 1n Fig. l, for entering a. pocket provided therefor at the thereof` forming a shoulder 3 and an inchned face 4, the latter being inclined outward from said shoulder to or towai'd the .point of the bolt. A wedge-like key 5, of substantially the size and shape of the recess 2' in the bolt, is adapted for mounting in said recess with its butt-elid againseit said shoulder 3. The face of said key is provided with a vseries of alternate crossribs or spines and notches which arevspaced' to correspond with the spacing of the threads o the hole or socket to be penetrated, in case the bolt is to be employed in a -threaded hole or socket; or, in case of a coil-spring, the spines and notches are spaced to correspond with the spacing of the coils of the spring to he entered or penetrated.

The key may be provided with alternate spines 7 and notches 8 which extend across to .the other, as shown in Figs. l, 2, 3 and. 4,. in which case they have an inclination to the face of the key from one lateral edge correspond with that of the threads or coils to be engaged thereby; or, as shown in Fig. 5, the surface of the key may have formed integral therewith a plurality of spaced, upright, alined spurs 7a which are adapted to enter the interstices between the coils of a spring while said coils closely embrace the convex surface `of the key. VThe spines or spurs not only serve to engage the spiral interstices or grooves and thus eifect'uallylock the key in position, preventing chance rctraction ofthe bolt, but also serve to admit of the retraction of the bolt and key when the forineristurned in a reverse direction,

. fthe spines or spurs following the spiral of the article penetrated. 'When 'employed in side of the socket. l

In practce,tlie key is inserted in the recess in the bolt with its butt-end 6 against the shoulder 3, and the bolt and ke may theneither be to ether forced direct y into position in the lio e, or be' turned o r sci-owed` up in the holewitli the spines or spurs on the face of the key meshing with the threads oi' vspirals of the article penetrated, the outer und of the bolt beingl grasped for effect/.ing siicli turning. When driven inward the lcsned distance, an outward pull on the bolt .causes the inclined face 4 to slip olf-slide 110 slightly upon the coinciding face of the key, the latter remaining stationary, resulting in a wedging or gripping pressure being exerted upon the walls of the hole or socket which effectually holds the bolt against withdrawal. To take up the slack which eklstsafter the outward pull on the bolt, the latter may be turned to screw the wedge forward into the hole. It is manifest that the `grip of the bolt' is increased proportionately with the tensile strain exerted resulting in little or no tendency on the part of the spring to break. W

As is obvious, thevbolt may be readily withdrawn by simply turning the bolt in a reverse direction so as to effect the turning of the key along the spiral path.

Whenthe bolt is intended for use in a threaded hole or socket, the spines and notches are both of V-shape to correspond with the threads of such hole. lVhen intended for `use in a coil-spring, the spines orspurs are V-shaped and the intermediate notches are of rounded groove-shape te correspond with the size and shape of the coil of `which the spring is formed. Having thus described our invention, what we claim as new, and desire to secure by Letl. The combination with an article whose interior wall or surface is provided with a spiral path, of a bolt having an inclined recess in it's side, and slidable means insaidrecess whereby meshing engagement is had with said spiral path when the bolt is subjected to an outward pull, said'means retain! ing said engagement when the bolt is turned forward and drawing said bolt farther into said article.

2. In a device of the character described, a bolt having a recess in the Aside thereof,A forming a shoulder and an inclined face,` the latter extending outward from said shoulder vtoward the poi-nt of the bolt, a tapered key slidably mounted in said recess, and s iaced transverse spines carried by the face oi said keyhsaid key and bolt being adapted for freely entering a threaded hole without turning, and said spines being adapted for meshing engagement with the threads of said hole when the bolt is partially withdrawn.

3. The combination with an article whose interior wall or surface is provided with a spiral path, of a bolt having an inclined recess in itsside, a key slidably mounted in said recess, and spaced ribs carried by said key in mesh with the spiral path of said wall.

(et. An expansion bolt adapted for mounting in the end of a coil-spring, said bolt comprising a bolt-body having a recess in its side which forms a shoulder and an inclined face, the latter extending from said shoulder toward the point of the bolt., and a tapered key slidably mounted in said recess, said key having on its surface spaced upright V- shaped ribs meshing with the coils et the spring.

5. An expansion bolt adapted for mount.- ing within the end of a coil-spring. said bolt comprising an unthreaded bolt-body having a recess in its face which forms a shoulder and an inclined face, the latter extending from said shoulder toward the point of the bolt, a wedge-like key slidably mounted in said recess, and a plurality of cross-ribs in the face of said key adapted to seat in the spiral interstices of a spring whereby threaded engagement is had between said key and said spring, said bolt being adapted to be turned forward for increasing the depth to which it is seated in the spring, and vice versa.

6. The combination with an article whose interior wall or surface has a spiral path, of a bolt having an inclined recess in its side, a tapered key slidably mounted in said recess, and means carried by said key whereby meshing engagement is secured with said spiral path when the bolt is subjected to an outward pull, said means retaining said engagement and drawing the bolt forward when the latter is turned forward.

In testimony whereof we atlix our signatures in presence of two witnesses.

CHARLES D. VERNON. JACOB P. MORNTN G STAR.

wWitnesses:

E. A. Ln'rAnn, H. E DUNLOIA

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