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Publication numberUS806407 A
Publication typeGrant
Publication dateDec 5, 1905
Filing dateDec 9, 1904
Priority dateDec 9, 1904
Publication numberUS 806407 A, US 806407A, US-A-806407, US806407 A, US806407A
InventorsHarvey Farrington
Original AssigneeHarvey Farrington
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Expansible wedge.
US 806407 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

PATENTBD DB0. 5, 1005.





the practical use thereof, such devices being well designated expansible wedges.

The object of this invention is to provide a device of the character above indicated which shall be simple and inexpensive as regards construction, durable, efficient, yand reliable in practical service7 convenient in its application to practical purposes, which shall embody novel features of construction whereby is rendered practicable the generation and maintenance of a force for locking, grappling, severing, or analo ous purposes, and the varying within wide Iimits of the intensity of such force for distribution-that is, from a moderate intensity for ordinary locking purposes to an exceptionally high intensity for severing, grappling, or similar purposes-and which shall possess certain well-defined advantages over prior analogous devices. s

The invention consists in the novel disposition and relative arrangement of the respective coperating partsor elements thereof whereby the attainment of the foregoing object is rendered practicable, in certain combinations, and in certain details of construction, all of which will be specifically referred to hereinafter and set forth in the appended claims..

The invention is clearly illustrated in the accompanying drawings, wherein similar reference characters denote like parts throughout the several views. y

In said drawings, Figure l is an elevation, partly in section, of an expansible wedge emodying my said improvements, there being shown in vertical section in conjunction therewith and to better illustratethe practical application thereof `a fragment of a body or an Specification of Letters Patent. .Y

Application led December 9, 1904. l Serial Nc 236,181.

Patented Dele. 5, i905.

object, as a cement or marble block, stone, or the like, having a pocket to receive the device for service. Fig. 2 is a transverse sectional view, the 'section being taken above the spiral keeper and the latters containingsocket as on line a a of Fig. 1, a body or an object such as above referred to as receiving said wedge for service being shown in horizontal section in conjunction therewith. Fig. 3 is a perspective view of the socket aforenamed detached from the general construction. Fig. 4 is a side lelevation of the spiral keeper aforenamed vdetached from the general construction.

In a general sense my present invention comprises an elongated rotatable expander traversed to a greater or less extent by a spiral Wedge-face anda spiral keeper, the latter being engaged by the wedge-face aforenamed and through the medium of which said keeper may be'brought directly or indirectly in to a locking engagement with or caused to grapple or impinge upon or exert a severing effect upon another object or structure upon said expander being suitably rotated.

It further comprises, in a general sense, an expander and a keeper of the type respectivelyabove specified and a circumferentially-expansible 4socket or shell, said exander and keeper being relatively arranged or coperation substantially as above explained and said socket or'shell containing and substantially housing said keeper.

Having reference Vto the accompanying drawings, 2 denotes a keeper formed from any suitable material, as'brass, steel, alloyed metal, or the like, said keeper 'havingy the general contour or form of a spiral.

In conjunction with the keeper 2 I purpose to make use of an elongated rotatable expander,the same being here illustrated as comprising a main portion 3 of a given suitable diameter and of any appropriate` contour in cross-section and a tapered portion 3', the latter formed in continuation of said main portion and being traversed wholly or partially by a spiral wedge-face 3, which bears a coperative relation to the keeper 2 when the parts are assembled and as will be hereinafter more fully explained. In this instance the wedge-face 3 continuously tapers in width throughout its course spirally along the tapered portion 3 from the tip ofthe lat- IOO ter to its point of intersection with the main member 3 and inversely to the taper of said portion 3, the raised convolutions forming said wedge-face being accordingly variably spaced along said tapered portion and said wedge-face being inclined away from the axis and in the direction of the tip of said expander for a purpose which will more clearly hereinafter appear. This wedge-face varies in height from end to end, its greatest height being at the entering end of the bolt, so that the lower coils of the keeper hereinafter described will be expanded slightly more than the upper coils thereof. I prefer also that the general spiral figure or contour of the wedge-face 3 shall tapervtoward the tip of the expander aforenamed and at variance with the inclination of the tapered portion 3, as clearly indicated in the drawings. Now to the end that the expanding effect on the keeper 2, as through the medium of the expander aforenamed properly manipulated and as will be hereinafter explained, may be distributed universally or entirely over the keeper 2, and hence not localized with respect thereto, said keeper comprises a series of spirals or convolutions formed in continuity and continuously tapered from a given maximum diameter to a given minimum diameter considered with reference to the cross-sectional contour of the end segments, respectively, of said keeper, the normal state of the latter accordingly being such that when it (the said keeper) shall have been partially adjusted along the tapered portion 3, with the wedgeface 3 engaging it between the coils or convolutions thereof, as clearly indicated in the drawings, any rotative action given to the expander aforenamed in the direction to impel it homeward will result, through the medium of the inclination of the tapered portion 3 in conjunction with the wedge-face 3 in said keeper being universally expanded circumferentially or in all lateral directions` with respect to the expander aforenamed for a locking, binding, severing, grappling, or similar effect, as directly on the wall of a pocket 4, formed in a body or an object 4, or indirectly thereon, as by way of a circumferentially-expansible socket 4, to be hereinafter more particularly referred to, said wedge-face under these conditions and by reason of its inclination away from the axis and in the direction of the tip of said expander alone presenting to and maintaining upon said keeper a wedging or locking force adapted to increase in intensity or resisting actionproportionately to any force or pull which may be applied to said expander and calculated to withdraw the same from the pocket 4.

More specifically, the outermost points of the keeper 2, considered with reference to the longitudinal axis thereof, constitute under normal conditions-that is, before said expander shall have been inserted to any material extent into said keeper-a general spiral of less diameter than the greater dialneter of the tapered portion 3, and upon said expander being duly manipulated or rotated, as stated, these outermost points of the keeper 2 are urged by the movement of said expander into said keeper radially and in unison outwardly from said expander and proportionately to the degree of entrance of said expander into said keeper, thus permitting the intensity of the locking, binding, or analogous action of the device as a whole to be varied at the will of the user.

The expander aforenamed is ordinarily and by preference provided with a suitable head for the application thereto of a suitable manipulating or operating tool, implement, or accessory, said head in this instance being denoted by the reference-numeral 5 and taking the form of an enlarged eye.

The keeper 2 is preferably formed from a piece of stock or wire having some resiliency, as brass, or capable of being given some resiliency, as steel, circular in cross-section at all points therealong and gradually tapering from one end to the other thereof, all as clearly shown in the drawings, said keeper in practice being inversely a )plied to the expander aforenamed relatively to its greater end segment diameter and the greater diameter of the tapered portion of said expander.

In many instances', particularly where the pocket 4, designed to receive the device as a whole, is formed in material somewhat malleable and it becomes desirable to intcrpose between the keeper 2 and the wall of said pocket an element whereby an extensive frictional holding effect may be had on said wall without appreciable indentation thereof, I provide a circumferentially-ex )ansible socket or shell 4, here shown as taking the character of a longitudinally split sleeve having inturned annular lips or flanges 5 5 at its respective ends and containing and substantially housing the keeper 2, the latter being disposed or adjusted within said socket previously to the formation of either or both of the lips or flanges 5 5., The socket or shell 4 may be produced from any suitable material, though a material having some resiliency or admitting of being given more or less resiliency, as brass or steel in sheet form, respectively, is preferred.

1n applying my improved expansible wedge to practical purposes a pocket 4 of suitable diameter is formed in the usual way in a stone, cement block, beam, marble slab, or other desired body or object 4, a fragment of which is illustrated in the drawings.

35 i number of pockets 4, each to receivevone of Then thel device, witli or.' without the socket "or shell 4" and with the keeper 2 adjusted headed portion projecting therefrom, whereupon byr means of a suitable toolvor implement applied, as to the head 5, the expander i aforenamed is rotated in the direction proper readily remove to urge it homeward with the result that the keeper 2 is expanded universally in all directions radially With espect to said expander for a wed ing, bin ing, orlockin action on the wall of? the pocket 4, such we gin binding, or locking action being applied irectly to such wall or indirectly thereto through the medium of the socket or shell 4 when the latter is used, said socket or shell being expansible circumferentially, as hereinbefore stated.

Where the body or object in conjunction with which my improved device is being used is formed from or consists of material more or less malleable, the kee er 2 when expanded, as above stated, w1 l tend to indent or become embedded somewhat in the wall of the pocket 4, and Where this indenting effect is not desired the socket or shell 4 ma be availed of, as hcreinbefore alluded to.

My improved expansible wedge will be found highly serviceable in the operation of hoisting stones, cement blocks, and similar bodies or objects, splitting or severing the same, a plurality of said wedges being ordi-v narily used inv this connection and a like said wedges, being formed in the body or object whic it is desired to thus split or sever, l

as a means for locking or retaining one article or object in conjunction with or vupon another, and, in fact,'in a multiplicity of situations where it is desired to lock or fasten a member, such as 8, whether headed or not, in position for serviceor to utilize the wedgng 'olver or effect ofthe devilce as a whole or oc lng, severing, or ra m0 ur oses. Again, it will be observed tlialf, wljielfi tllie device shall have been locked, as stated, for service, as in a pocket 4, the keeper 2 having an extensive frictional holding grasp on the wall of said pocket either directly or indirectly, as above pointed out, any outward pulling or withdrawing force applied to the expander aforenamed will tend, through the medium of the wedge-face 3, to proportionately increase the wedging, locking, or binding action of said wedge-face on the keeper 2, thereby enhancing the effectiveness and worth of the device for practical service. However, the ex ander of the device may be (f) from said ocket by reversely rotating the same, and the keeper 2 may be thereafter separately removed from saidpocket, all as may become `desirable in the practical operation of the device. Hence it will'be seen that my improved expansible wedge is well adapted for the purposes for which it isA designed and, further, that the same may be modiiied to a considerable extent, particularly as regards the cross-sectional contourand character of the stock or material yfrom. which the keeper 2 is formed, the manner of providing the wedge-face 3, the relative arrangement or dispositionyof said wedge-face with respect to the expander of the device, the character and material of the socket or shell 4, the length of the tapered portion 3', and various other minor details of construction of the separate parts or elements of the device without materially departing from the spirit and principle of my invention. t

Having thus described my invention, what -I claim, and desire to secure by Letters-Patent, is,-

1. An expansible wedge I comprising an elongated, rotatable, tapered expander,-travl erse by a spiral wedge-face, and a spiral keeper whose end' segments vary from a maximum diameter to a minimum diameter, respectively, said keeper being adjusted along said expander inversely to the taper thereof, and relatively to the greater diameter of the tapered portion of said expander and the greater end segment diameter of said keeper, and engaging said wedge-face to receive from the latter an expanding force, upon said ex ander being dulyrotated, substantially as lierein specified.

2. An expansible wedge comprising an elongated, rotatable, tapered expander, trav-` ersed by a spiral raised membervarying in height from end to end and forming a spiral wedge-face, and a spiral keeper, said keeper being formed from a piece of stock or wire continuously tapered from one end# to the other thereof, and engaging said wedge-face to receive therefrom an expanding force, upon said expander being duly rotated, substantially as herein specified, the keeper being tapered inversely to the ta er of the expander.

3. An expansible- We ge comprising an elongated rotatable expander traversed by a spiral wedge-'face or thread having one face inclined away from the longitudinal axis and in the direction of the tip of the expander, its other face being perpendicular to the longitudinal line of the expander, and a spiral keeper engaging said wedge-face and IOO IIO

of the expander and adapted to engage the 1o spiral thread of the expander and to be oxpanded on the rotation of the expander in the proper direction.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2777718 *Apr 1, 1953Jan 15, 1957Vegren Conrad RQuick acting connector
US3492906 *Sep 9, 1968Feb 3, 1970Avia InstrShank strength fastener
US4395859 *Jun 5, 1980Aug 2, 1983State Of Illinois, Department Of TransportationMethod and apparatus for securing an object to a support structure
US4648767 *Jan 8, 1986Mar 10, 1987Artur FischerFastening element
US4712955 *May 14, 1985Dec 15, 1987Rexnord Inc.Expandable fastener assembly
US6345472 *Jun 9, 1997Feb 12, 2002Warren TaylorApparatus and method for anchoring and erecting concrete or similar materials
US6835036 *Mar 7, 2003Dec 28, 2004Illinois Tool Works Inc.Concrete anchor
US20040175251 *Mar 7, 2003Sep 9, 2004Paul Sigismund D.Concrete anchor
US20040181227 *Mar 11, 2003Sep 16, 2004Farid KhaliliSystem and method for attaching a bone plate to bone
WO1998057004A2 *Jun 9, 1998Dec 17, 1998Warren TaylorApparatus and method for anchoring and erecting concrete or similar materials
Cooperative ClassificationF16B37/12