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Publication numberUS2297923 A
Publication typeGrant
Publication dateOct 6, 1942
Filing dateJul 11, 1939
Priority dateJul 11, 1939
Publication numberUS 2297923 A, US 2297923A, US-A-2297923, US2297923 A, US2297923A
InventorsWilliam E S Strong, Charles E Parsons
Original AssigneePierce John B Foundation
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method of positioning magnetically responsive sleeves within a mass of moldable material
US 2297923 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Och 2- w. E. s. STRONG ETAL 2,297,923

METHOD OF POSITIONING M ETICAL RESPONS SLEEVES WITHIN MASS MOLDAB MATERIA Filed July 11, 1939 INVENTOR WILLIAM E.5.5TRO AND CHARLES E AR w? l 1 THEN: ORNEY Patented Oct. 6, 1942 METHOD OF POSITIONING MAGNETICAILY RESPONSIVE SLEEVES WITHIN A MASS OF LIOLDABLE MATERIAL William E. S. Strong, New York, N. Y., and Charles E. Parsons, Princeton, N. J., assignors to John B. Pierce Foundation, New York, N. Y., a corporation of New York Application July 11, 1939, Serial No. 283,724

3 Claims.

This invention relates to anchorage devices and-to methods of positioning the same.

More particularly. this invention relates to an improved method for pro-positioning sockets or liners adapted for employment with structures formed from concrete or other moldable, hardsetting material, to form anchorage means for male-threaded elements.

The present invention contemplates the use of .a magnetic metallic shell wall insert having an open end. The wall structure of such insert is formed with deep-shouldered threading, whereby upon pouring concrete about the insert, a portion of said concrete fills the lower portion of the insert and supplements the engagement of the concrete with the external threading, to secure the insert against withdrawal orsubstantial separation from the hardened concrete or like material.

By the employment of magnetic materials for the anchorage device, means are afforded whereby said anchorage devices may be magnetically held 1 on a suitable jig or other supporting means during the stage of pouring the concrete or like material, and the holding devices readily removed therefrom after the concrete has hardened.

It is a feature of the invention that the holdin power of, the insert is derived by means other than a distortion ofthe walls thereof, outward expansion against the walls of a drilled openin within the holding structure, or by external wings, ilns, or the like. Itis an additional feature that the lag screw may be removed and re-inserted, without damaging the sleeve or adversely affecting its holding power.

This application is a continuation in part of our presently copending application Serial No. 156,699,1l1ed July 31, 1937, entitled Anchorage device.

Other features and advantages will hereinafter appear.

In the accompanying drawing:

Figure'l is an elevation, partly in section, of a screw-threaded liner pursuant to the present invention;

Figure 2 illustrates a preferred method of positioning the liner and holding the same during the molding of the concrete mass;

Figure 3 is illustrative of the application of the liner and the engagement of concrete with the internal and external threading thereof;

Figure 4 is a plan view of the liner.

The anchoring device or liner 10, Fig. 1, comprises a helically conflgurated, open ended cylinder, preferably of steel, sheet iron, or like sheet metal, advantageously formed by die-embossing thread-forming corrugations on a flat metal blank, and shaping said blank around a mandrel to form a cylinder, the extremities of the corrugations being brought into register to form a continuous thread.

It will be understood that materials other than steel or sheet iron may be used for manufacturing our anchoring devices; magnetic materials, however, lend themselves advantageously to desirable means of positioning and holding the liners during the pouring and compacting of the cementitious mass, as later described.

As illustrated in Figure l, the liner Ill has a deep shouldered female threading I1, and a male thread provided with sloping, collapse-resistant shoulders or abutments l8. l'he liner may advantageously be used with any moldabie material which, although possessing desirable structural qualities in mass, is of a friable nature in that corner-surfaces or threadlike configurations crumble under abrasion combined with tensile or compressive stresses, such friable characteristic making it impracticable to tan or otherwise form a screw-thread in the material per se.

Fig. 2 illustrates a preferred method of positioning a liner or anchorage device In during the stage of pouring and compacting a cement slab 20. A liner l0 may be inserted over a mandrel 22 of soft iron or like magnetic material, said mandrel forming the core of an electromagnetic holding device 23 connected, as shown, to any suitable source of electric current.

Any suitable switch means, as 2%, may be provided in the circuit.

When it is desired to position a plurality of anchorages H3 in one operation, a suitable ji having such plurality of electromagnetic devices 23 may be employed, each of the cores 22 of which receive an anchorage l0.

Closing the switch 24 nergizes the electroma net 23, retaining the anchorage It! for suitable positioning with respect to a mold, one wall, 2 I, of which is shown.

As appears in Fig. 2, the core 22 is shorter than the anchorage device in, to maintain a substantial portion of the end of the anchorage in open status.

' The cementitious mass may then be introduced into the mold, whereupon it flows into engage- I ment with the shoulders 18 of the external wall shoulders of the internal corrugation ll. Desirably, the concrete mass is jarred or compacted to densify the mass and to insure the intimate engagement of the concrete with the corrugations of the anchorage device l0.

Upon the opening of the electric circuit the electromagnetic holding means 22, 23 may be removed. I

As is shown in Fig. 3, the anchorage lli is secured within the cement slab 20 by the engagement of hardened concrete with the external shoulders l8, and by the coincident engagement of a concrete slug 20a, integral with the main body 20, with several of thelowermost internal corrugations H. The anchorage device is, therefore, characterized by the absence of external projections; the maximum external diameter of the anchorage device being only slightly greater than the maximum external diameter of the la screw 25, said device is adaptable for use in restricted locations. It is thus possible to position said devices in comers or like locations where the proximity of a plurality of wall surfaces may preclude the use of anchorages having wing-like The metal of the liner is substantially unmutilated by the lag screw 25, and, therefore, the

. stated screw can be removed and re-inserted without damaging the liner or detracting from its holding power.

Desirably, the length of the anchorage device or liner in afifords full threaded engagement with the threads of the lag screw or the like, and additionally provides alength of engagement of the concrete with the internal threading ll of the order of one-quarter of the total threaded length of the liner.

It will be observed that the sleeve W is not held within the slab 20 by expansion or other pressure-induced distortion. The sloping shoulders l8 resist tensile pull on the sleeve it along frusto-conical surfaces established within the mass, and normal to the said shoulders, as indicated by the arrowed lines in Fig. 3.

The liner l0 may be provided with a. suitable rust-resistant coating, such as tin or zinc. The close bond between the concrete of the slab 20 and the liner I0 precludes the penetration of water around the liner, and plastic cement may be utilized to seal the space between the shank of the lag screw and the inner wall of the liner to prevent the percolation of water therein.

Whereas a specific form of our invention has been described, it will be understood that many changes and modifications may be made without departing from the spirit of the invention.

We claim:

1. The method of securing a screw anchor having an open end and a screw-thread provided internal and external wall within a, mass of hardsetting moldable material, comprising inserting an electromagnetic core into said anchor to plug all but the lower portion thereof against the entry of said moldable material, energizing said electromagnetic core to retain said anchor thereon, causing said hard-setting moldable material to flow about the externalwall of said anchor and to flow into the said open end of said anchor to engage the screw-threading thereof,-de-energizing said electromagnetic core after said moldable material has set, and removing 'said core therefrom.

2. The method of positioning an open-ended sleeve within a mass of hard-setting moldable material, comprising magnetically retaining said sleeve on a core disposed internally thereof, inserting the thus mounted and magnetically held sleeve into a mass of such material, whereby said material enters the open end of said sleeve to an 'extent permitted by said core, and withdrawing said core from said sleeve after the said moldable material has rigidified suficiently to preclude any further-substantial entry of said material into said open-ended sleeve.

3. The methodof positioning a magnetically responsive open ended tubular sleeve within a mass of hard-setting moldable material, comprising the steps of plugging said sleeve over all but a desired portion of its length, magnetically holding such plugged-sleeve in desired position, causing said mass of moldable material to flow about said sleeve and into the open end thereof, permitting said moldable material to solidify, and releasing said magnetic holding means and removing'the plug means from said sleeve.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2416559 *Sep 4, 1945Feb 25, 1947Wilson John HartApparatus for molding and handling concrete slabs
US2670502 *Oct 11, 1951Mar 2, 1954Goodrich Co B FMethod of making rubbery articles
US2808621 *Nov 17, 1951Oct 8, 1957Goodyear Tire & RubberMethod of and apparatus for manufacturing anti-skid tires
US2887763 *Jul 29, 1955May 26, 1959Benjamin L SnavelyAssembly molding process for electrical elements
US2916793 *May 6, 1954Dec 15, 1959Jesse D EllisApparatus for making concrete building block
US3061888 *Dec 28, 1959Nov 6, 1962Ambrose E WadhamMethod of manufacturing a reinforced plastic article
US3216157 *Jun 28, 1961Nov 9, 1965Pinter George SConcrete structure and process for making same
US3234756 *Nov 19, 1962Feb 15, 1966Stuart & Co Inc C HEarring construction
US3744208 *Oct 19, 1971Jul 10, 1973Spanel Abram NathanielGrout accommodating shells for easy storage and transport
US4288189 *Aug 10, 1979Sep 8, 1981Yardley Products Corp.Threaded insert
US4948541 *Oct 27, 1988Aug 14, 1990Stephen BeckMethod of forming an arm rest for a chair having a tubular passageway for containing control mechanisms
US5222957 *Apr 10, 1992Jun 29, 1993Zimmer, Inc.Method and apparatus for extracting a cement mantle from a bone recess
US5839155 *Jun 6, 1996Nov 24, 1998Cfr CorporationContinuous flow cleaning system with ozone injection
US20040079043 *Oct 20, 2003Apr 29, 2004Scott William M.Pull strip for forming holes
U.S. Classification264/278, 425/3, 335/305, 425/DIG.330, 269/8, 52/705, 425/126.1
International ClassificationE04B1/41, F16B1/00, F16B13/00
Cooperative ClassificationF16B2001/0035, Y10S425/033, E04B1/4121, F16B13/00
European ClassificationF16B13/00, E04B1/41D1