US1821400A - Anchorage device - Google Patents

Description

Sept. l, l931- R. s. PEIRCE 1,821,400

ANCHORAGE DEVICE Filed Jan. 28h 1926 Patented Sept. l, 1931 `namen s. ramon, or Emsnann, InLINoIs Anonoaxen nnvrcn application' med January 2s, 192e'.- serm 1ro. 84,432. y

My invention relates to anchorage' devices, and in one of its aspects, to such devlces which employ sleeves having tapering'bores and which are receivable within openings provided in ,a wall or other support andwhich are adapted to be expanded into holding engagement with thesupport by means of expanding screws or rodsdriven into the sleeves. In such devices, the smaller ends of the bores are placed innermost within the openings that are formed in the walls or other suppor'ts that are to receive the anchoring devices. Workmen frequently insert' the sleeves wron end to. To uard against this Wrong use o the sleeves, form them with portions at .the smaller ends of the bores that 'are in line with the bores, these portions desirably completely closing the smaller ends of the bores. Inthe use of an anchoring that is to be inserted first is readily discerned.

In accordance with another feature of my invention, the expanding rod, which is received in the sleeve to be substantially coaxial therewith, has a lateral portion or portions which find. passage through the sleeve into direct holding engagement with the support.. The expanding rod is desirably in the 0rm of a screw whose threads penetrate the sleeve f laterally and preferably; at vintervals into holding engagement wit the support. In accordance with another object ofthe invention, I em loy an expanding rod and a securing mem er extending alon the e x panding rod said expanding ro having a thread of a diameter to enter the securing member laterally when the rod is driven, the angle defined between the` thread' and a planar portion that includes the portion of the axis extending from vsuch thread to the entering endof the rod being less than sixtyfive degrees. In accordance withY another feature of my invention, I employfan expanding rod withinthreads of gentle slope. This structure enables the ro thus threaded, to be driven as a nail and to be turned somewhat as a screw as which Fig. l is a side elevation of the sleeve thus constructed, the end of the sleeve i iron or of ductile metal and substantially coaxial with the sleeve and expanding said sleeve into engagement with the support and formed with intertwined' a result of the hammer blows thereon sothat as it is forced into place, channel ways are formed which receive the threads and guard Y the rod from withdrawal. l

I will explain my invention more fully by 5s reference to the accompanying drawings-in referred form of expanding rod.; Fig.l 2 is a View in elevation of thecomplete anchorage device with the wall carryin it shown in sec-, tion and an object supporte by theexpanding rod also shown in section; Fig. 3 is a longitudinal sectionalvv view of thev preferred form of sleeve; Fig; 4-isa view similar to E 1g. 2 before reception o i kthe anchorage de- 65 vice; and F ig. j isaview similar to Fig. 2 with the expanding rod shown mainly in Section and the expanded sleeve also shown in section. The anchorage device includes anfexpand-76 ing rod-1 preferably formed with a head 2""4 which is desirabl with Yintertwine threads 3 which-are desirably` deep and slope `with res ect tothe axis of the screw less than forty-five degrees, the i5.

.threaded portion ofthe rod from crown to crownof the screw thread kbeing desirably of the'same diameter as the Unthreaded ob- )ect holding portion ofthe rod Vwhich is adyac ent the head. The sleeve orfsecuring memso cast metal such as such'as lead. The y sleeve is desirably threaded` throughout the er 4'may be formed of length of its bore similarly to the threading ofthe expanding rod so as readily vto take 'sa the threa s of the rod, such threading of the sleeve being especially desirable if thesleeve is made of castirom- The bore of the sleeve desirably c tapers' whereas the: expanding: rod does not taper, where itis surrounded by '9a the sleeve, except at thel inner end of the rod which has a formation 5 in the nature of a point. That is, the entering end of the rod is unthreaded and tapers *to a point. In the useV of `the anchoragedevice, the sleeve is first inserted, with thesrnalle'r end of theisleeve bore innermost, within the cylindrical opening 6 which is `formed inthe wall 7 or other support, this opening being to snugly receivethe sleeve. The me of a size conical. The rod-is formed i 4rod is next inserted into the sleeve, point first. It may be hammered into place, the

' ,rod turning as its screw thread follows or `suliiciently thin and the threading of the exrod is sufliciently deep so that the panding crowns of the threads of the rod will penetrate the sleeve and have direct engagement with the support. The interaction of the A sleeve and the expanding rod is such that the threading of the rod will not continuously penetrate the sleeve but only at intervals, such as indicated at 8. The unthreaded portionnof the expanding rod supports any suitable object 9 through which the rod is passed.

As viewed in elevation, Fig. l, it will be observed that the angle defined between each thread and a planar portion that includes the portion of the axis extending from such thread to the entering end of the rod is less than sixty-live degrees. By thus sloping the threads, a lateral wedging action is caused upon the surrounding sleeve having a force greater than the force exerted on the sleeve axially of the nail whereby the sleeve is prevented from travelling inwardly with the nail but is held stationary with respect to the wall and with no material tendency to become hunched or buckled anywhere throughout its length. This characteristic enables the employment of a very thin surrounding sleeve which, if desired, may be readily penetrated by the crowns of the threads.

In order that the workmen may be guided in the use of anchoring sleeves that are circumferentially continuous throughout their length and have tapering bores, Whether of the construction shown or of other construction', I provide the sleeve at the end thereof where the bore is smallest with a portion 10 which extends into line with the bore.V In

the preferred embodiment of the invention, Y

the portion 10 is an integral part of the sleeve and is imperforate so as to close the sleeve at the end thereof where the bore is smallest. The point 5 of the expanding rod will find its way through the portion 10 of sleeve from being crowded ahead as the rod is being driven, a result which I believe to be novel in the type of device illustrated. The tapering end ploughs its way through the narrower portions of the sleeve while also expanding these portions. While the bore of the sleeve is wider, at other places, than the tapered end of the rod in the device as illustrated, I do not wish to be thus limited nor do I wish to be limited to the preferred sloping ofthe threads.

1Having thus described my invention, I c aim:

In an anchorage, the combination with a my name.

RALPH S. PEIRCE.

the sleeve and will inwardly extend the sleeve into gripping engagement with the wall portion at the bottom of the opening 6. The tapering end of the rod l is of greater width, at some portion thereof, preferably the upper or base portion of the tapered end than the narrower portions of the bore of the sleeve 4, whereby the sleeve is expanded into engagement with the surrounding wall of the hole in the supportI 7 to prevent this

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