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Publication numberUS3265349 A
Publication typeGrant
Publication dateAug 9, 1966
Filing dateAug 13, 1963
Priority dateAug 13, 1963
Publication numberUS 3265349 A, US 3265349A, US-A-3265349, US3265349 A, US3265349A
InventorsHamrick James C
Original AssigneeJet Line Products Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Sleeve mold for forming passageway in concrete structures
US 3265349 A
Abstract  available in
Images(3)
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Aug. 9, 1966 JQ C JHAMR ICK 3,265,349 7 SLEEVE MOLD FOR FORMING PASSAGEWAY IN CONCRETE STRUCTURES Filed Aug. 13, 1963 5 Sheets-Sheet l INVENTORI 1219-5 IO 7 JAME-s C HAMEICK I 6,3211, M

Z1 F5 Z5 BYAM*W ATTORNEY S Aug. 9, 1966 Jfc, HAMR'lcK 3,265,349

SLEEVE MOLD FOR FORMING PASSAGEWAY IN CONCRETE STRUCTURES Filed Au 13; 1963 M 5 Sheets-Sheet z INVENTOR. JAME-s C. HAMRXQK BY 4' W ATTORNEYQ} Filed'Aug. 13, 1963 5 Sheets-Sheet 5 Aug.- 9,-1966 1 J. CQHAIMRIICK 3,265,349

S LEEVE MOLD FOR FORMING PASSAGEWAY IN CONCRETE STRUCTURES I INVENTOR.

JAMES C. HAM/Q/CK United States Patent 3,265,349 SLEEVE MOLD F033 FORMENG PASSAfiEWAY IN CONCRETE STRUCTURES James C. Hamrick, Matthews, N.C., assignor to Jet Line Products, Inc., Miatthews, N.C., a corporation of North Carolina Filed Aug. 13, 1963, Ser. No. 391,332 4 Claims. (Cl. 249-177) This invention relates generally to the formation of a passageway through a poured concrete structure, such as a Wall, a floor, and the like, and more particularly to an improved device providing a sleeve mold for this purpose.

In construction work, where concrete walls, floors, and the like, are to be employed, it is desirable to form passageways or openings through these concrete structures when they are being built so that pipes, electrical wiring, and other elongated articles can be subsequently installed in the passageways to extend through the concrete structures, thereby avoiding the cutting of holes through the concrete structures to permit installation of such elongated articles therethrough which latter practice is expensive and time-consuming, as well as being frequently responsible for structural weaknesses occurring in the concrete structures.

In concrete construction work, it is sometimes the practice to install or lay electrical conductors, pipes, and similar service connections directly in the concrete so that such service connections are embedded in the concrete throughout a major portion of their length. The major portions of such service connections as electrical conductors may thus be embedded in a floor of a building with the free end extending transversely of the floor upwardly or downwardly to a desired point, as to a receptacle to be installed subsequently.

Molds heretofore available for use in forming a passageway through a poured concrete structure are of relatively limited adaptability and are generally restricted as to the range of sizes of concrete structure with which they may be suitably employed for forming passageways therethrough. In many instances, such molds are custommade and must conform to predetermined dimensions with a relatively limited tolerance range in order to satisfactorily serve their purpose. Such custom-made molds are expensive and where the tolerance limitations are exceeded, often fail to perform satisfactorily. One such problem encountered where tolerance limitations are exceeded is the seeping of concrete within the interior of the mold as the concrete structure is being poured because of undue looseness between an end capand one end of the mold.

Under various circumstances, molds of the character described may remain in place after hardening of the concrete structure thereabout, or it may be desired to remove the molds when their purpose has been served. In the former circumstance, it is sometimes desirable to accurately locate the mold after the concrete floor has been installed, and this has proven troublesome with molds heretofore in use. In the latter case, difficulties in removing the mold after hardening of the concrete structure thereabout are commonplace.

It is therefore an object of this invention to provide a new and improved device for forming a passageway through a poured concrete structure, such as a wall, a floor, and the like, which device is so constructed that it is not required to adhere to rigid dimension tolerances of limited extent, is less expensive than custom-made molds, and yet is highly reliable for forming a passageway through a concrete structure without the seepage of concrete into the interior thereof during the pouring of the concrete structure.

3,265,349 Patented August 9, i966 "ice It is another object of this invention to provide a new and improved device of the character described in the form of a sleeve mold for forming a passageway through a poured concrete structure which is readily adaptable for use in diverse situations requiring molds of differing lengths so as to substantially reduce the number of stock sizes of sleeve molds which would ordinarily be kept in inventory on a construction project to be ready for use as needed.

It is another object of this invention to provide a new and improved sleeve mold for forming a passageway through a poured concrete structure, wherein the sleeve mold may be readily removed from the concrete structure after hardening of the concrete structure thereabout.

Another object of this invention is to provide a sleeve mold intended for use in forming a passageway through a poured concrete structure, which sleeve mold has a plurality of aperturesor openings extending radially therethrough and through each of which the free end portion of an electrical conductor is intended to pass. The remainder of said electrical conductor is embedded in or is intended to be embedded in a concrete deck and the free end portion is passed through one of the apertures in the sleeve, the free end portion being coiled within the sleeve mold during pouring of the concrete and subsequently Withdrawn from the sleeve mold and connected to a receptacle junction box or other electrical connection. Any suitable means may be employed to close the apertures not used and to surround the electrical conductor passed through an aperture. Polyurethane foam cut in plugs or strips is satisfactory for this purpose.

Still another object of the invention is to provide a new and improved sleeve mold including detecting means whereby the mold may be located after the concrete has been poured thereabout.

A further object of the invention is to provide a sleeve mold for use in pouring concrete wherein there may be associated therewith a base member of substantially greater cross-sectional area than the diameter of the mold, thereby giving increased support to the mold while the concrete i being poured thereabout.

It is another more specific object of this invention to provide a new and improved device for forming a passageway through a poured concrete structure, wherein the device comprises a split sleeve mold having a joint connection securing the side edges of the sleeve defined by the split in overlapping relation, with the joint connection including elongated slots extending transversely of the sleeve and located in the opposite end regions thereof adjacent one side edge defined by the split, and struckout tabs adjacent the other side edge defined by the split and respectively corresponding to the slots, wherein one of the tabs is loosely received within the slot in one end region of the sleeve, while another tab is relatively snugly received within the slot in the opposite end region of the sleeve to provide for adjustment of the size of the end region of the sleeve which includes the loosely interconnected slot and tab. Thus, the latter end region of the split sleeve may be expanded sufiiciently by appropriate relative movement between the loosely interconnected slot and tab so as to accept another split sleeve therewithin in telescopingrelationship to increase the effective length of the device where required. In this way, the number of stock sizes of sleeve molds ordinarily held in inventory on a construction project may be substantially reduced, since the effective length of the device in accordance with the present invention can be varied at will by telescoping two or more split sleeves together. In addition, the adjustability of the size of one end region of the split sleeve mold permits an end cap to be tightly received on the end of the sleeve corresponding to the said end region without observing narrow tolerance limits as to the relative dimensions of the end cap and the split sleeve mold to prevent the seepage of concrete into the interior of the sleeve mold during the pouring of the concrete structure.

Some of the objects of the invention having been stated, other objects will appear as the description proceeds, when taken in connection with the accompanying drawings, in which FIGURE 1 is a plan view of a flat blank adapted to be rolled to form a split sleeve mold in accordance with the present invention;

FIGURE 2 is an exploded perspective view of the split sleeve mold constructed from the blank of FIGURE 1 and an end cap provided for one end thereof;

FIGURE 3 is .a perspective view similar to FIGURE 2, but showing the split sleeve mold mounted in place at one end thereof on a form and having the end cap covering the other end thereof;

FIGURE 4 is a fragmentary longitudinal sectional view taken along the line 44 in FIGURE 3;

FIGURE 5 is a fragmentary enlarged longitudinal sectional view taken along the line 55 in 'FIGURE 3;

FIGURE 6 is a perspective view showing a pair of the split sleeve molds in telescoped relationship;

FIGURE 7 is a side elevational view of a single split sleeve mold as mounted at one end thereof on a form for a concrete floor or the like with an end cap covering the other end of the split sleeve mold, and showing a portion of the concrete poured about the split sleeve mold;

FIGURE 8 is a side elevational view of a pair of telescoped split sleeve molds mounted between two parallel members of a form for a vertical concrete wall or the like, and showing a portion of the concrete cast about the telescoped split sleeve molds;

FIGURE 9 is a perspective view of a modified form of split sleeve mold in accordance with the present invention, partially broken away for purposes of clarity;

FIGURE 10 is a fragmentary longitudinal sectional view taken along the line 10-10 in FIGURE 9;

FIGURE 11 is a plan view of a base member illustrating a configuration which renders it readily attachable to the sleeve mold;

FIGURE 12 is a perspective view of the sleeve mold in association with the base member, and illustrating the sensing or detecting means on the cap of the mold;

FIGURE 13 is an inverted perspective view similar to FIGURE 12, but looking fro-m the opposite direction;

FIGURE 14 is a fragmentary sectional view taken along the line 14-44 in FIGURE 13, and illustrating the relative dimensions of the base member and sleeve mold at their juncture; and

FIGURE 15 is a sectional detail of the flexible tab member taken along line 1515 of FIGURE 12.

Referring more specifically to the drawings, the device for forming a passageway through a poured concrete structure, such as a wall, a floor, and the like, in accordance with the present invention is assembled from a flat blank 10 of generally rectangular configuration. The blank 10 is preferably made from sheet metal and is provided with a pair of spaced apart slots 11, 12 adjacent a side edge '13 thereof, and a pair of struck-out tabs 14, 15 adjacent the other side edge 16 thereof. The elongated slots 11, 12 are positioned so as to extend substantially perpendicular to the adjacent side edge 13, and it will be observed that the length of the slot 11 is substantially greater than that of the slot 12. The tabs 14, 15 adjacent the other side edge 16 of the blank 10 are disposed so as to extend substantially parallel thereto in opposite directions toward the marginal edges 17, 18 of the blank 10 which are adapted to form the end edges of the split sleeve mold upon assembly of the blank 10.

The blank 10 is further provided with a plurality of spaced apart end panels 19 extending outwardly from the marginal edge 18 and adapted to be bent to form mounting flanges which serve as feet to support one end of the split sleeve mold. Each of the end panels 19 is provided with a centrally-located aperture 20 therethrough.

Associated with each of the end panels 19 are respective pairs of score lines 21. One score line 21 of each pair is alined with each side edge of the end panel 19 corresponding thereto and extends inwardly of the marginal edge 18 of the blank 10. The score lines' 21 associated with each of the end panels 19 facilitate the bending thereof during assembly of the split sleeve mold by providing respective weakened areas in the blank 10 in communicative alinement with each side edge of the end panel 19 corresponding thereto. The expression Weakened areas as used herein is intended to apply to means other than score lines 21 for facilitating the bending of the end panels 19, such as slits (not shown), for example.

Preferably, the blank 10 may be rolled into a cylindrical form to comprise a split sleeve in which the sleeve portions adjacent the side edges 13, '16 of the sleeve defined by the split therein are arranged in overlapping relation. A plurality of the rolled blanks 10 may be readily nested together to provide for a substantial increase in the number of split sleeve molds which may be stored in a given area as compared to the usual custommade sleeve mold, this adaptability for nesting a number of the rolled blanks 10 together also leading to important economies in transportation charges for shipping the sleeve molds to desired locations. 'Following the rolling of the flat blank 10 into a cylinder, the sleeve mold to be formed from the blank 10 can be readily assembled on the job as needed by a construction worker without requiring any tools other than pliers to bend the tabs 14, 15 and the end panels 19 to form mounting flanges at one end of the split sleeve.

For purposes of clarity, the marginal edges 17, 18 and the end panels :19 as termed in describing the blank 10 will be referred to as end edges '17, '18 and flanges 19, respectively, in describing the assembled split sleeve mold which will be identified broadly by the reference numeral 10.

The tabs 14, 15 are bent laterally outwardly from the cylindrical sleeve 10 and are respectively inserted through the slots 11, 12 following which the tabs 14, 15 are bent outwardly in opposite directions toward the opposite end edges 17, 18 of the sleeve 10. The overlapping sleeve portions adjacent the side edges 13, 16 are thereby secured together in such a manner as to substantially eliminate relative longitudinal movement therebetween. It will be observed that the slots 11, 12 are arranged with their lengths extending in a direction transversely or circumferentially of the sleeve 10 and are spaced so as to be respectively disposed outwardly with respect to the medial position on the sleeve 10 in the opposite end regions of the sleeve 10. The tab 14 is loosely received within the slot 11, while the tab 15 is relatively snugly received within the slot 12.

The end panels 19 of the blank 10 upon being bent laterally outwardly from the cylindrical sleeve 10 form mounting flanges 19 to secure the split sleeve mold 10 to a form or deck 22 which is adapted to be covered by poured concrete. In this connection, the respective pairs of score lines 21 associated with each of the flanges 19 facilitate bending of the end panels forming the flanges 19 and also provide for the disposition of the end edge 18 of the sleeve 10 in flush relationship with the surfaces of the flanges 19 facing outwardly with respect to the sleeve 10. This flush relationship between the end edge 18 of the sleeve 10 and the outwardly facing surfaces of the flanges 19 insures proper engagement of the device with the form or deck 22 to prevent concrete from entering into the interior of the device along the end edge 18 thereof during the pouring of the concrete structure. Suitable fastener elements, such as nails 23, for example, are driven into the form 22 through the apertures 20 in the flanges 19 to secure the sleeve mold 10 in place.

The flanges 19 extend laterally outwardly of the sleeve at the end thereof adjacent the snugly-received tab 15. The opposite end of the sleeve 10 adjacent the looselyreceived tab 14 may be covered by a cap 24 to prevent the entrance of concrete into the sleeve 10 from that end thereof. The cap 24 includes a marginal cylindrical rim adapted to frictionally engage the end portion of the sleeve 10 adjacent the end edge 17 in tight overlying relationship.

In accordance with the present invention, rigid dimension tolerances of limited range are not required to be observed in order to achieve a sufficiently tight frictional engagement between the marginal cylindrical rim 25 of the cap 24 and the underlying end portion of the sleeve 10 adjacent end edge 17. In this respect, the end region of the sleeve 10 corresponding to the end edge 17 is adjustable in size or diameter because of the transverse play of the tab 14 in the slot 11 where it is loosely received. The diameter of the end portion of the sleeve 10 adjacent end edge 17 can therefore be readily adjusted to accommodate normal dimensional variances in manufacture as between the cap 24 and the sleeve 10 in order that the cap 24 may be received in tight frictional engagement about the end portion of the sleeve 10 adjacent end edge 17.

The adjustability of the size or diameter of one end region of the sleeve 10 is also important in that it permits the latter end region of the sleeve 10 to be expanded sufliciently for receiving another split sleeve 10 within the first split sleeve 10 in telescoped relationship (FIG- URE 6 and FIGURE 8). This telescoping relationship between two or more split sleeves 10 in accordance with the present invention permits a construction worker to vary the effective length of the sleeve mold at will as needed for use in forming a passageway through a poured concrete structure to substantially reduce the number of stock sizes of sleeve molds which would ordinarily be kept in inventory on a construction project to be available if needed.

In FIGURE 6, the pair of telescoped split sleeves 10 may be arranged so as to include laterally outwardly extending flanges 19 on the free end of one sleeve 10 and a cap 24 on the free end of the other sleeve 10 whose end panels 19 have not been bent to form laterally outwardly extending flanges and are instead received within the first sleeve 10 in telescoped relationship.

In FIGURE 8, the device is shown as being installed between parallel form members 26 of a form 22 for a vertical concrete wall, the device comprising two split sleeves 10 telescoped together as previously described so as to arrange the distal ends of the telescoped sleeves 10 with the laterally outwardly extending flanges 19 thereon for securing the telescoped sleeves 10 in place on the parallel form members 26, 26 and extending therebetween.

In FIGURES 9 and 10, a modified form of split sleeve mold 10' is disclosed, the split sleeve mold 10' differing from the split sleeve mold 10 illustrated in FIGURES 18, inclusive, in that a third tab and slot joint connection comprising a transversely elongated slot adjacent the side edge 13' and a tab 31 adjacent the side edge 16 of the sleeve 10 are located approximately intermediate the ends of the sleeve 10'. The tab 31 is loosely received within the slot 30 in the same manner of the tab 14 which is loosely received within the slot 11 for permitting adjustment of the diameter of the end region of the sleeve 10 adjacent the end edge 17'. This added tab and slot joint connection to secure the overlapping sleeve portions adjacent the side edges 13', 16' of the sleeve 10' formed by the split therein is beneficial when the length of the sleeve is relatively long to prevent the occurrence of gaps between otherwise widely spaced tab and slot joints which could allow concrete to enter within the sleeve. The modified sleeve 10' may be further equipped with end caps 24' at each of its ends. In the illustrated embodiment shown in FIGURES 9 and 10, each of the end caps 6 24' is dish-shaped and includes a marginal cylindrical rim 32 terminating in a beaded edge 33. The caps 24' are adapted to be inserted within the respective ends of the sleeve 10' so as to dispose the marginal cylindrical rims 32 thereof in underlying frictional engagement with the ends portions of the sleeve 10 adjacent the end edges 17 and 18 and the beads 33 in abutment with the respective end edges 17 and 18'.

It will be understood that the caps 24 and 24' may be interchangeably employed with the sleeves 10 and 10' within the spirit of the present invention.

In removing a split sleeve mold from a poured concrete structure following hardening of the concrete structure thereabout, it will be observed that the positioning of the tab 14 or 14' for either sleeve 10 or 10' so as to extend toward the end edge 17 or 17' (as in FIGURE 4) allows a suitabe tool, such as a screwdriver, to be thrust beneath the tab 14 or 14 by a construction worker. The sheet metal from which the tabs on the sleeves 10 or 10 are made is such that pressure applied against the portion of the tab connecting it to the sleeve or bending of the tab in a reverse direction from the direction in which it was originally bent is usually suflicient to cause the tab to break away from the sleeve 10 or 10'. Upon breaking of the tab 14 or 14 by utilizing a screwdriver or other suitable tool, a person can thereafter readily collapse a substantial portion of the split sleeve radially inwardly to facilitate removal thereof. In many instances, the form 1 22 would also be removable to provide access to the other tab 15 or 15 which can be broken from the sleeve 10 or 10' in the manner described to facilitate removal of the sleeve from the concrete structure.

In FIGURE 11, a base member or plate 34 is illustrated which may be associated, as desired, with any of the forms of the invention previously described. Thus, as in FIGURES 12, 13 and 14, the base plate 34 is cut away adjacent its center as at the straight lines 35 to accommodate the flanges 19 on the end of the mold 10. The lines of cut 35 may be interconnected by arcuate lines of cut 36 so that the center of the base plate 34 is cut away to define a centrally located opening 37. The diameter of the opening 37 is slightly smaller than the inside diameter of the mold 10 so that the edge 18 on the mold 10 is supported by the base plate 34 as most clearly seen in FIGURE 14.

As illustrated in FIGURE 13, the flanges 19 are bent outwardly from the mold 10 after being passed through the cut-away portions 35 in the base plate 34. The base plate 34 and mold 10 are thereby readily connected and maintained in this condition by the tendency of the split sleeve to expand against the Wedging action created by the flanges 19 penetrating the base plate 34. The base plate 34 is provided with a desired number of openings 20" adjacent its marginal edge through which nails or other suitable fastening means 23" may be passed.

Although the base plate 34 is illustrated as being of circular external configuration, it will be understood that its configuration may be of any desired shape.

The cap 24 in FIGURE 12 is provided with a flexible tab or feeler element 40 which may be formed of rubber or other resilient material, and which is intended to pro-,

trude through the finished layer of concrete formed above and about the sleeve mold 10. The feeler element 40 may be associated with either of the caps 24 or 24 and may be used in conjunction with any form of sleeve mold within the spirit of the invention. In any event, it will be appreciated that the protrusion of the element 40 above the finished concrete makes it possible to locate the mold after the concrete is poured. The flexibility of the member 40 renders it yieldable under pressure of a finishing trowel for ease in finishing the concrete.

The sleeve mold of FIGURE 12 is also provided with a plurality of apertures 41 extending radially through the Wall of the sleeve and provided for the reception of the free end of a length of electrical conductor embedded in concrete as shown in FIGURE 7. The openings 41 are closable as by plugs or strips of polyurethane foam 42 as means for keeping concrete from entering the mold about the electrical conductor C (FIGURE 7) or through an unused aperture 41 (FIGURE 12). After passing the free end of the wire C through the aperture 41, the free end of the wire is coiled within the sleeve mold while the concrete is poured. After the concrete has hardened about the mold, the cap 24 may be removed and the free end of the wire drawn from the sleeve mold 10 to a suitable electrical connection such as a receptacle junction box or the like.

It will therefore be seen that I have disclosed a device of improved construction and adaptability for use in forming a passageway through a poured concrete structure. The device is inexpensive and is so constructed as to prevent the entrance of concrete into the interior thereof during the pouring of the concrete structure, thereby making it unnecessary to fill the device with sand, as is often done with sleeve molds of inferior construction to prevent concrete seepage into the sleeve molds during the pouring of the concrete structure.

In the drawings and specification there have been set forth preferred embodiments of the invention and, although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention being defined in the claims.

I claim:

1. A device for use in the pouring of a concrete structure, such as a wall, a floor, and the like, to form a passageway therethrough, said device comprising (a) a split sleeve,

(b) said sleeve having at least two slots therein adjacent one side edge of said sleeve formed by the split,

(c) the slots being elongated in a direction transversely of said sleeve and being spaced apart so as to include one slot disposed in each of the opposite end regions of said sleeve,

(d) the slot in one of the opposite end regions of said sleeve being longer and more closely spaced to said one side edge than the slot in the other end region of said sleeve,

(e) a plurality of tabs struck out from said sleeve, said tabs being of substantially equal width and being disposed adjacent the other side edge of said sleeve formed by the split and corresponding in number and relative positions to the slots in said sleeve,

(f) the sleeve portions adjacent said side edges of said sleeve formed by the split being in overlapping relationship,

(g) said tabs being received through the respective slots corresponding thereto,

(h) the tab corresponding to the longer slot disposed in said one end region of said sleeve being loosely received therethrough to provide for play therehetween, and

(i) the tab corresponding to the slot disposed in said other end region of said sleeve being relatively snugly received therethrough,

(j) whereby the size of said one end region of said sleeve is rendered adjustable by causing relative movement between the loosely interconnected tab and slot disposed in said one end region.

2. Apparatus for use in forming a concrete structure, such as a wall, a floor, and the like, with a passageway therethrough, said apparatus comprising (a) a form enclosing at least a part of a space to be filled by the concrete structure,

(b) a split sleeve,

(c) said sleeve having at least two slots therein adjacent one side edge of said sleeve formed by the s lit,

(d) the slots being elongated in a direction transversely of said sleeve and being spaced apart so as to include One slot disposed in each of the opposite end regions of said sleeve,

(e) a plurality of tabs struck out from said sleeve, said tabs being disposed adjacent the other side edge of Said sleeve formed by the split and corresponding in number and relative positions to the slots in said sleeve,

(f) the sleeve portions adjacent said side edges of said sleeve formed by the split being in overlapping relationship,

(g) said tabs being received through the respective slots corresponding thereto,

(h) the tab corresponding to the slot disposed in one end region of said sleeve being loosely received therethrough to provide for play therebetween,

- (i) the tab corresponding to the slot disposed in the other end region of said sleeve being relatively snugly received therethrough,

(j) the end of said sleeve adjacent the snugly-received gab having a plurality of flanges projecting there rom,

(k) said end of said sleeve being provided with pairs of spaced weakened areas,

(1) each pair of spaced weakened areas respectively corresponding to one of said plurality of flanges and comprising (1) a weakened area in communicative alinement with each side edge of the flange corresponding thereto and extending into the other end region of said sleeve;

(m) said flanges being bent laterally outwardly of said sleeve,

(11) the edge of said end of said sleeve being disposed in flush relation with the surfaces of said flanges facing outwardly with respect to said sleeve,

(0) said end edge of said sleeve and said outwardly facing surfaces of said flanges engaging said form,

(p) fastener means extending into said form and securing at least one flange thereto, and

(q) a cap covering the opposite end of said sleeve adjacent the loosely-received tab.

3. A blank adapted to be assembled into a sleeve mold for use in forming a passageway through a concrete structure, such as a wall, a floor, and the like, said blank comprising (a) a flat sheet of substantially rectangular shape,

(b) said sheet having at least two slots therein adjacent one side marginal edge thereof,

(c) the slots being elongated in a direction perpendicular to said one side marginal edge of said sheet and being spaced apart so as to include one slot disposed on each side of the medial point on said one side marginal edge of said sheet,

(d) the slot on one side of the medial point on said one side marginal edge of said sheet being longer and more closely spaced to said one side marginal edge than the slot on the other side of the said medial point,

(e) a plurality of tabs of substantially equal width struck out from said sheet and being disposed adjacent the other side marginal edge of said sheet in substantially parallel relation thereto, said tabs corresponding in number to the slots and in substantial longitudinal alinement therewith,

(f) a plurality of spaced end panels extending outwardly from the end of said sheet remote from the longer slot,

(g) said sheet being provided with pairs of spaced score lines, and

(h) each pair of spaced score lines respectively corresponding to one of said plurality of end panels and comprising one score line in communicative alinement With each side edge of the end panel corresponding thereto and extending into said sheet away from said end thereof.

4. A mold for use in forming voids during the pouring of concrete structures such as walls, floors and the like, said mold comprising;

(a) a split sleeve, the said sleeve having at least two slots therein adjacent one side edge of said sleeve,

(b) the slots being elongated in a direction transversely of said sleeve and being spaced apart so as to include one slot disposed in each of the opposite end regions of said sleeve,

(c) a plurality of tabs of equal width struck from said sleeve, said tabs being disposed adjacent the other side edge of said sleeve and corresponding in number and relative positions to the slots in said sleeve and being receivable therein,

(d) the slot disposed in one end region of said sleeve being longer than the other slot and more closely spaced to said one side edge of the sleeve, and

(e) the end of said sleeve remote from said longer slot having a plurality of flanges extending therefrom adapted to provide a support for said sleeve.

References Cited by the Examiner UNITED STATES PATENTS 746,445 12/1903 Bois 25-128 1,229,576 6/1917 Boyton et a1. 25-128 1,482,565 2/1924 Johnson et a1. 25-128 1,603,245 10/1926 Pederson 25-128 1,729,356 9/1929 Murray 25-128 1,845,760 2/1932 Murray 25-128 1,885,492 11/1932 Trew 229-21 2,022,601 11/1935 McDonald 217-3 2,197,737 4/ 1940 Appleton 220-32 2,648,439 8/1953 Miller 25-128 2,668,999 2/1954 Baechler 25-121 2,684,518 7/1954 Whitlock 25-128 3,004,320 10/1961 Beckman 25-128 3,119,895 1/1964 Palmer 220-32 1. SPENCER OVERHOLSER, Primary Examiner.

ROBERT F. WHITE, MICHAEL B. BRINDISI, WILLIAM J. STEPHENSON, Examiners.

G. A. KAP, Assistant Examiner.

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Classifications
U.S. Classification249/177, 249/183, 29/513, 220/690
International ClassificationE04G15/06, E04G15/00
Cooperative ClassificationE04G15/061
European ClassificationE04G15/06B
Legal Events
DateCodeEventDescription
Apr 26, 1982ASAssignment
Owner name: BENJAMIN ELECTRIC MANUFACTURING COMPANY A CORP. OF
Free format text: MERGER;ASSIGNORS:BENJAMIN ELECTRIC MANUFACTURING COMPANY, A CORP. OF TENN.;COLONIAL MANUFACTURING COMPANY,THE, A CORP. OF MICH.;HARRIS & MALLOW PRODUCTS, INC., A CORP. OF N.J.;AND OTHERS;REEL/FRAME:003981/0451
Effective date: 19761220