US1238384A - Mold-form. - Google Patents

Description

M. BLUMENTHAL.

' MOLD FORM.

APPLICATION FILED MAR- |9| 1917.

1,238,384.. Patented Aug. 28, 1917.

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one of my UNITED STATES PATENT orator..-

MAURICE BLUMENTHAL, 0F BRQOK LYN, NEW YORK.

MOLD-FORM.

Specification of Letters Patent.

. Application filed March 19, 1917. Serial No. 155,658.

conduits in or of cement, concrete or similar material, and the object'thereof is to provide an improved mold form of the class and for the purpose specified whereby conduits Of the class specified and intended for any desired purpose may be quickly, economically and easily formed or constructed, and with this and other objects in View the invention consists in a mold form or forms of the class specified, constructed and adapted to. be used as hereinafter described and claimed.

The invention is fully disclosed in the fol lowing specification, of which the accompanying drawing forms apart, in which the' separate parts of my improvement are designated by suitable reference characters in each of the views, and in which Figure ,l is a longitudinal sectional view showing one step in the process of using my improved mold form or forms in making concrete conduits; i

Fig. 2 a similar view showing another step of said process;

Fig. 3 a section on the line 33 of Fig. 1;

Fig. '4 a sectional longitudinal view of proved mold forms;

Fig. 5 a section on the line 5'5 of Fig. i v

Fig. 6 a view similar to Fig. 5 but-showing a modification.

In the practice of my invention, I provide a mold form (1 shown in Figs. 1, 5 and 6, and which consists of a metal tube of any desired lengthand any preferred transverse dimensions, and which is made up of -two similar opposite longitudinal parts a and two other similar longitudinal parts a and'the parts a are tapered from one end a of the tube to the other end a of the tube, and the parts a are similarly tapered in the opposite direction, and the parts a are rigscrewed into the parts-a -to setor become hard Patented Aug. 2s, 1.917.

idly connected by transverse brace or other I members a, in any desired manner, to form what- I call a wedge or key member a The side portions or of the wedge member a and the corresponding longitudinal side members a of the tubular form are preferably connected as shown in Fig. 5, in which the side edge portions of the parts a abut against the'side edge portions of the parts a and the parts a are provided at their opposite ends with lugs or cars a which overlap the parts a and through a which are and whereby the by the parts a of the tubular form are which are passed screws wedge member a formed and the parts a rigidly connected. v

In Figs. 1, 2, and 3 I haveindicated a process of using two of my improved mold forms in making conduits in'cement, concrete and similar material, or in making concrete or cement conduits of the class a specified, and in said figuresI have also shown at b a section of earth or street in which is dug or formed a trench and, in the practice of my invention, trench a mold box 0 preferably consisting down, and set up again for use, whenever deslred.

, ,The end portions 0 and c of the mold box 0 are provided with apertures 0 and the form or forms a are passed through said mold box and through said apertures,- as shown in Fig. 1, after which concrete or similar material 5 is poured into the mold box, and conduits c are. formed in the concrete, andwhen this concrete has had'time or partially so, the wedge member or members a of the forms are drawn out in the direction of the arrow 00, the screws a havingbeen first withdrawn after which the parts 11 of the forms may be easily taken out as will be readily understood, after which the parts a of the forms are again connected and the end portions a thereof are inserted into the conduits c in the section of concrete first built up, after which the box 0 is placed in position with: the exception of the end portion 0 thereof, and as indicated in Fig. 2, afterlgwhich said mold box is again filled in with cQncrete, and

I place in the of side members 0 and end members 0 and .0", and the parts of the mold box may be the conduits are intended, and conduits made in this manner may be used as electric cable or wire conduits, or as sewer or drainage conduits, or for any other desired purpose.

In order to be able to pull out the wedge or key member a of the form, as hereinbe fore described, any suitable pulling device or means may be connected with one of the transverse hr cs members a, or I may form in the larger end portions of the parts a of the wedge or key member holes (1 with which may be connected any suitable device for performing said operation.

In Fig. 6 of the accompanying drawing, I

have shown a modified construction of the mold form a 1n which the separate parts a and a are abutted and provided with an interlocking rabbet groove construction 6, and with this exception the construction-and operation will be the same as that shown in Figs. 4 and 5, and one of the parts (0*, the bottom part when the mold form or forms are in use, is provided with a longitudinal rib or fin portion f by which a draining groove 9 is formed in the bottom of the conduit or conduits c,

Although I have shown and described my improved mold form as circular in form in cross section, it will be understood that this cross sectional shape is not absolutely necessary, and other shapes or forms may beemployed, and changes in and modifications of the construction herein'described may be .made, within the scope of the appended 1,2ss,ase

transversely to form a wedge or key device and the other oppositely arranged parts being tapered in the opposite direction.

2. A tubular mold form composed of four separate longitudinal parts, of which two oppositely arranged carts are tapered from one end to the olirer and connected to form a wedge or key device and the other oppositely arranged parts being tapered in the opposite direction, said parts being detachably connected.

3. A tubular mold form of the class specified, composed of four longitudinal similar parts, two of which are tapered from one end of the mold device to the other and the othertwo tapered in the opposite direction, one of said parts being provided on the outer side thereof with a longitudinal rib or fin.

- 4. A tubular mold device composed of four similar longitudinal parts, of which two opposite parts are tapered from one end to the other of the mold device and connected to'form a key or wedge, the other two parts being tapered in the opposite direction and all of said parts being detachably connected and one of said arts being provided with a longitudinal lo or fin on the outer side thereof.

In testimony that I claim the foregoing 'as my invention I have signed my name in presence of the subscribing witnesses this 10th day of March 1917.

' MAURICE BLIEIENTHAL. Witnesses:

C. E. MULREANY, H. C. THOMPSON.

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