Blind-end hole forming device for poured concrete slabs

Dec. 27, 1955 _{L A}. whitlock 2,728,126

BLIND-END HOLE FORMING DEVICE FOR POURED CONCRETE SLABS

Filed April 6, 1953

<img file="US2728126A_D0001.tif" />

<img file="US2728126A_D0002.tif" />

i6

INVENTOR .Leslie /1. IVhiflock,

BY

<img file="US2728126A_D0003.tif" />

ATTORNEYS

United States Patent Office _p 2,728,126

Patented Dec. 27, 1955

2,728,126

BLIND-END HOLE FORMING DEVICE FOR POURED CONCRETE SLABS

Leslie A. Whitlock, Modesto, Calif.

Application April 6,1953, Serial No. 346,986

Claims. (CI. 25—128)

The sleeve 1 projects 'ata right angle from the attachment plate 4 and is preferably fastened to the annular flange by spot-welding or the like.

At the corners thereof the attachment plate 4 is formed with holes 5. The adjustable ;sleeve 2 has a baffle plate •or disc -6 disposed -therein adjacent but short of the Outer end 7; the disc 6 being held in place by an outturned •annular flange.:8 attached to the sleeve '2 on the inside, as by ;spot-welding or the like.

The adjustable sleeve 2 is cut, on opposite sides and at its inner end, with a pair of notches 9 of circumferentially elongated, right angle triangular form.

The notches 9 thus define opposed circumferential edges 10 which are generally a part of a-helix :and Extend diagonal to the transverse or radial -plane -of the •telescopic sleeves. Such edges 10 rare saw-toothed or ratchet cut, as shown.

Qn opposite sides thereof the fixed sleeve 1 -is provided with inwardly deformed nubs or detents 11 -alined with .each other and adapted for cooperative engagement with the ratchet edges 10 of the notches' 9.

When the device is -in use -the attachment -plate ;4 -is ra.butted.at a -pre-selected point against-the inner -face of ;a iorm 12 on or against which a-concrete slab 13-is subsequently .poured; the .-attachment-plate -4 being secured -to ^Λ wXk^{12 by} ΰ^{318 14 driven} torough the holes 5.

thT ^the ^^t plate 4 so mounted on the form 12, the assembly of telescoped sleeves 1 and 2 projects bST ? -‘““‘“’J&lt; “ crete siao 13 when it is poured.

_ρΛ-^Ιη»·^3&lt;1ντ^3η£:ε1.^{θί pourin}S ^of said concrete slab 13 the 1^ffanrf^V? °^f T® ^{assembly of tbe} telesconed sleeves ? ^{ad 2 IS ad}l^usted so that such length is only slightlv less than the known thickness of the slab 13. This adjustment is accomplished by manually rotating the sleeve 2 m the fixed sleeve 1 whereby to cause the ratchet edges ”»^d”^Mi“ “ --» s 51οίν_β¹2^β₁·η³±ΤΤ⁸? ^{10 diagonaI}’ ^rofatioa of sleeve 2 in one direction causes it, by the coonerafiva wm-fflv^meT °^{f Said edgeS and the detents} It to move outwardly, whereas rotation of said sleeve 2 in the opposite

XT T^rmT ^th%^Same ‘° ^{be adiusted} inwardlT

When the sleeve 2 is adjusted to proper nosition it ¹ EThXTX ?^aT °^{f Λ}®^e£T££ setting i a T ^{h tChet edges 10 at the} point of setting, i. _e. there cannot thereafter be any accidental telescopic reduction in the effective length of the See during pouring of the slab. ^ce is poured; toe _surface wpS”'* £ n ring only slightly beyond the outer end 7 of the adiust p*^,a“” — * fAvsxxa nd the fixed sleeve 1; the initially adjustable sleeve 2 wiSffleTiab 11”³®^{6 remaining}-f°r moment13^ThXen^dXX “Τ’;⁶^{0 h}°^{Ie 16 in the concr}ete slab is ‘ ^{desired t0} °Pen the blind end of the hole froT ffs οηΪηΤηΤ^{11 (n?t} —^Π) *^{S engaged in} such hole HnTT T ^pr°J^ectlng into the sleeve 2 and abutting the baffle disc 6 from the back side. The punch is nlX % T ^b ? ^{d,sc 6 ln a} Erection to fracture the of «·“.«’ ™ ² - - ‘ov desSXXT °^Ut °^{f the plug 15 in the} manner above described, the hole extends through the wall and is open

The present invention is directed to, and it is a major object to provide, a novel device for forming a blind-end hole in a poured concrete-slab, yet with the blind end adapted to be driven out to produce a hole through the slab open at :both ends.

The device is two-part and is initially supported from .a form on or against which the concrete slab is subsequently poured. Upon stripping of the form, one part of the device removes therewith, leaving the other /part within the blind-end hole; such either part being adapted to be driven out of the hole in a direction to open its blind end when desired, and for the purpose of permitting the installation of utility conduits through said hole in the slab, or the mounting in the hole of utility outlets on one side of the slab with access from the other side.

Another important object of the present invention is to provide a blind-end hole forming device for poured concrete slabs, wherein such device is readily manually adjustable in effective length so that the device may be accommodated to concrete slabs of varying thickness.

An additional object of the invention is to provide a device, as in the preceding paragraph, which includes telescopic sleeves, and wherein said adjustment is accomplished by a novel arrangement of nubs on one sleeve cooperating with ratchet-edges in the other sleeve dis- 40 posed diagonal to the transverse or radial plane of said telescopic sleeves.

It is also an object of the invention to provide a blindend hole forming device for poured concrete slabs which is designed for ease and economy of manufacture and convenience of use.

Still another object of the invention is to provide a practical, reliable, and durable blind-end hole formin', device for poured concrete slabs, and one which will be designed³’^{7 PUrp}°^{3e f}°^{r which is} 50 X ^justment °^fX device,

These obj’ects are accomplished by means of such structure and relative arrangement of parts as will fully appear by a perusal· of the following specification and claims.

In the drawings:

Fig. 1 is a perspective view of the device, detached

Fig. 2 is a sectional elevation of the device looking in *T Λ™® T^re&lt;^^{tlOn aS Flg}‘ ¹’ ^{but sbow}“g the device as in use, though prior to stripping of the form take'non °^{f the device}&gt; Cached, laKen on line 3—3 of Fig. 1.

^F&gt; ^{4 iS} d^{SimiIar t0 Fig}· ^{2 but after} stripping Of the form and removal therewith of the fixed sleeve

Keternng now more particularly to the characters of reference on the drawings, the device comprises a fixed sleeve 1 and an adjustable sleeve 2; the latter sleeve being telescoped into the fixed sleeve 1 in relatively close fitting but manually adjustable relation. ^Y

The fixed sleeve 1 is secured at its outer end .. annular flange 3 to, and opens through, an enlarged at” ⁷⁰tachment plate 4 of rectangular configuration at both ends for the installation of a utility conduit or the mounting of a utility outlet. ,,, - ,.

Also, as the outer end of the adjustable sleeve 2 lies short of the adjacent surface of the slab, such surface can be accurately finished smooth and level without interference from the device.

From the foregoing description it will be readily seen that there has been produced such a device as substantially fulfills the objects of the invention, as set forth herein. *

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.