US1019598A - Cement-mold. - Google Patents

Description

Patented Mar. 5, 1912.

ATTORNEYS (0.. WASHINGTON. n. c.

H. W. CLARK.

CEMENT MOLD.

APPLICATION FILED NOV.15, 1911.

WITNESSES %44/ COLUMBIA UNITED STATES PATENT OFFICE.

HORACE W. CLARK, OF MATTOON, ILLINOIS.

CEMENT-MOLD.

Specification of Letters Patent.

Application filed November 15, 1911.

Patented Mar. 5, 1912.

Serial No. 660,358.

To all whom it may concern:

Be it known that I, HORACE WV. CLARK, a citizen of the United States, and a resident of Mattoon, in the county of Coles and State of Illinois, have invented an Improvement in CementMolds, of which the following is a specification.

My invention is an improvement in cement-molds of the collapsible type, such as are employed in constructing pipes, sewers, drains, columns, and the like.

The invention is more particularly an improvement in the wedge type of fastening l for the inner one of the two concentric molds usually employed.

The details of construction, arrangement,-

part a vertical section illustrating my fastening as it appears before tightening. Fig. 3 is an elevation of the same parts showing the fastening tightened. Fig. 4 is a horizontal section on the line 44 of Fig. 2. Fig. 5 is a perspective view illustrating the wedges proper, together with a portion of the key by which they may be operated.

The numeral 1 indicates the outer shell, and 2, the inner shell of a cement mold.

These are arranged concentrically, and, in

I practice, iron blocks 3 are inserted between 1 them for holding them spaced apart, the cement being fed into the annular space which separates the two parts. The outer shell 1 has parallel flanges that lie flat together and are secured detachably by any suitable means. A wooden wedge-shaped block 3 (see Fig. 4) is placed between the flanges 4 and the latter are drawn ti ht against it when the fasteners are properIy adjusted.

It is requisite to collapse the inner mold 2 in order to effect its removal after the cement has set in the required form. For

this purpose the section or shell 2 is split or divided longitudinally and the adjacent edges 4 are turned inward and lie parallel as shown.

clamps 5 are formed of flat iron bars whose ends are bent at a right angle and thus lie opposite and parallel to each other. The clamps are riveted at one end to the fixed wedge-bar 6 and their opposite ends overlap the flange 4 of the mold 2 which is farthest removed from the wedge-bars. The wedge-bar 6 is provided at its inner side with wedges 10, and the slidable wedgebar 7 is similarly provided on its outer side with wedges 11, which, in practice, work in contact with the wedges 10 of the bar 6. The wedges are secured by screws to the respective bars, as illustrated in section in Fig. 2. The screw pins or bolts 8 pass through slots 13 in the fixed wedge-bar 6 and enter the slidable wedge-bar 7. The spiral springs 9, before referred to, encircle the portions of the pins or bolts 12 which project beyond the fixed wedge-bar 6, the same being interposed between the heads of the pins and the washer applied to the wedge-bar. It is apparent that by this arrangement, if the wedge-bar 7 he slid up or down, the pins or bolts 12 will move to a corresponding degree in the slots 13 of the wedge-bar 6.

In practice, when it is desired to draw the edges or flanges 4 of the mold 2 toward each other, the bar 7 is driven downward by blows of a hammer applied to its head, so that its wedges 11 slide down on the wedges 10 of the fixed bar 6, thus crowding the two bars farther apart, as illustrated in Fig. 3. Thus the outer wedge-bar 6 to which the clamps 5 are rigidly attached remains stationary during the operation just described, and the other or inner slidable bar 7 is driven down in the space between the bar 6 and the adjacent flange 4 of the mold section, the pins 12 moving with it as permitted by the slots 13. In order to effect release of this engagement of the wedges and to adjust the sliclable bar 7 upward to the position indicated' in Fig. 2, one wedge is provided on one side, adjacent to its plain surface, with a corrugated surface, as indicated at 10 and 11 in Fig. 5-see also Figs. 2 and 3. When the wedges are juxtaposed, the two corrugated surfaces lie practically parallel and near each other, but without contact, and the space between them permits the insertion of a key 14-see Figs. 4 and 5- whose working end is provided with longitudinal ribs and grooves corresponding to the corrugations -or teeth of the wedges.

Thus, by rotating the key, the wedges are moved longitudinally or caused to slide on each other as required for releasing them from looking engagement. By adjustment of the movable Wedge-bar and its wedges by this means, I avoid injury of the newlymade concrete form, which Would be likely to occur by concussion and vibration if the Wedge-bar 7 were driven upward and the wedges released by the blows of a hammer.

By the above described arrangement and combination of parts, I form a fastening for a collapsible mold which may be easily and safely operated and is highly effective for its purpose.

l/Vhat I claim is l. A clamping and fastening means for a longitudinally divided cement mold, the same comprising parallel bars having wedges arranged oppositely and adapted to slide on each other, guide pins fixed in the movable bar and passing through slots in the outer fixed bar, springs applied to the pins and bearing on the outer bar, and angular clamps secured to the outer bar and engaging the edge of the mold section which is farthest removed from the wedge-bars, substantially as described.

2. A clamping and fastening means for a longitudinally divided cement mold, the same applied thereto and consisting of parallel wedge-bars arranged in proximity and provided with a series of wedges adapted to work in slidable contact, the outer fixed bar having a series of longitudinal slots, screwpins passing through said slots and inserted in the inner or slidable bar, springs applied to the outer ends of the pins, and angular clamps secured to the outer wedge-bar and their opposite ends engaging the cont1nu ous edge of the mold, substantially as described.

8. A clamping and fastening means for a longitudinally divided cement mold,\ the same comprising two parallel bars provided with opposite wedges arranged for slidable contact, one pair of the wedges being constructed with corrugated and inclined surfaces adjacent to their plain inclined surfaces, the corrugations being adapted to receive a rotatable key for adjusting the wedges on each other, guide pins secured to the inner wedge bar and projecting through the outer one, springs applied to such pins, and angular clamps secured to the outer bar and engaging the farther edge of the mold, substantially as described.

A. The improved means for clamping and fastening a mold which is divided longitudinally, the same comprising two bars arranged parallel and provided with opposite wedges adapted to work in contact, the outer bar having a series of longitudinal slots and the inner bar having a series of pins Which pass through said slots and are provided with springs pressing against the outer bar and angular clamps secured to the outer bar,

as shown and described.

HORACE W. CLARK. Witnesses:

J. A. RUE, DWIGHT P. CHILD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. C."

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