US1840169A - Combination clamp and drift pin - Google Patents

Description

Jean. 5, 1932. A. Q, NASH COMBINATION'CLAMP AND DRIFT PIN Filed Jan: 24, 1950 Patented Jan. 5, 1932 UNITED, STATES PATENT or-HCE@ -f ALEXANDER e. NASH,y or` CINGINATI, onro; GEORGE w. smEvEivsoN, ADMNrs'rRAroR or sAID ALEXANDER o. NAzsmDEoEAsED, AssreivoRmo CIRCULAR CONCRETE con TArNnR coRroRAronorenvoiNNArr omo; .AcoRroaArIon or omok COMBINATIONCLAMP 'AND DRIFT DIN Application'pmdfranary 24, 1930: 's eriaim. 423,1?1. f

This `invention is directed toV aoombination the jaws into 3kclamping relation ywith the clampand drift pin designed more particularly for use in connection in assembling and relatively fixing the sections of 'shell' molds usedin cement orlike molding.

ln building structures of cement or like plastic material it is usual to provide a shelllike mold Vto receive vand form the plastic material, and, particularly in large constructions, these shell molds arermade up of sec tions with edges ofangle-iron' orlikereinforcement. In previous constructions these sections of the mold are assembled `and held in mold-forming relation by'bolts passed through openings in the outstanding mai gins ofthe angle-iron yedges and held by nuts c tightened on the bolts during .the molding operation. rlhe timerequir'ed to plac'eand remove `the Vnuts and `bolts,to say nothing of thedifiiculty incident to holding/the sections in proper relation toy aline ythegbolt holes of 'adjacent sections, rendered theV work of assembling and dismantling the molds ay diiii-l cult .and expensive detailof the building operation.

The primary object of the present inven-L tionis to materially simplify and reduce the time and expense of both assembling and dismantling the Vmold sections through provision of a single element serving as a combined drift pin and clamp, and through the use of which the sections are assembled in proper relation by use of the drift pin-feature of L the element and the angle-iron elements of the sections secureiy'and relatively clampedv to hold the mold sections in mold-forming relation, through which both the assembling and dismantling of the mold sections may be carried out in a speedy and convenient manf ner, with a consequent saving of timel and expense. j

The improvement, structurally considered,

.comprises an integral lelementformed tol pro- ;vide relatively convergent clamping jaws withY an extended handle, one of the jaws being extended and provided with a ixed drift pin; so that the drift pin, when used to draw the sections together thereafter becomes the pivot on which the element is rotated to force angle iron sections or free the sections.: i f The invention is'illustrated in the accompanyingdrawings, in which `i Fig. 1 is a perspective view, showing the improved 'clamping element in operative relation with theangle-iron margins ofa mold section` f j .Y 5. Fig. 2 is a planlof the same. l

Fig. 3 is an edge view of the same, the mold sections being shownin section.l f -1 Fig. 4 is a perspective view-.of he improved clamp. f i f f' Fig. 5 is atransverse section through the clamp in operativeposition. L

f The improved clamp comprisesan integral i metallic body l, having a U-shaped portion 2, the side walls of which, as 3 and 4, have their inner-surfaces relatively convergent, as' indicated more particularly in Fig.n5. The clamp includes a handle section, extended fromjthe Lupper part of the UI-shaped portion, such between the side walls 3 and 4. This extension 6 isprovided withy arrigid driftfpin 7, projecting at right angles to the plane of the extension', and of course tapering toward itsV free end.. The drift pin has a length exceeding the ytransverse dimension of,v theclamp proper. f 'f nl j The improved-clamp, while of course joa` pable and intended for any use tof which it may be put, is primarilygdesigned for' posi'- tioning andclamping'fmoldsections in concrete or like `moldingl Asf'illustrated such molds are ymadeupof sheet metalV sections'S, having angle-iron reinforcements 9` at their marginal edges. Theseangle "irons are 'se y 'cureditopresent an outstanding! flange y10, and in assemblingthe sections 8, theflanges lO, both vertically and horizontallyfofthe sections are placed in contact and are designed to be secured together, both in annular formation and in superimposed relation. These flanges 10 are formed with openings 11, and in assembling the sections, as heretofore roposed, these openings of the respective anges l0 are brought into proper relation b drift pin action, and bolts passed through such aligned holes and secured by nuts. The difiiculty of holding the holes in the flanges 10 aligned after use of the drift pin and while inserting the bolts, together with the time consuming operation of applying the bolts and nuts in assembling and removing same in dismantling, added a very material expense to the ultimate molding operation.

The resent improvement avoids all the difficulties, and so reduces the time necessary to the operation, as to render the assembling and dismantling a comparatively minor item of time or ex nse. In use, when the sections are initially arranged in proper relation, the drift pin is driven through the appropriete holes in the meeting flanges l0, and such holes brought into alignment, thus properly` positioning the adjacent mold sections. hen, without removing the drift pin amlthereby holding the sections of the mold in their roper relation, the clamp as a whole is turned) on the drift pin as a pivot, and the jaws of the clamp forced to embrace the meet-y ing flanges 10. This operation, by reason of the conve nce of the walls of the portion 2 :ifA the c amp, forces the flanges 10 into fixed-and close contact, and secures the mold sections in desired relation. Of course, the separation of the clamp, when dismantling the sections, is carried out in an obvious inan- The clamp thus provides for drift-pin ar rangement of mold sections and subsequent clamping of such sections in fixed relation in a simple speedy operation, requiring only a s'uicient number of the clamps and a member for driving the drift pins, and the clamps can be continually reused. The clamps are of course to be constructed of rugged metal to stand the specified usage, though they may be of any size requisite for the particular mold. The handle 5 is sufliciently stron'g to rmit driving, thus insuring that force may e used if desired to insure a proper clamping action even under a slight distortion of the anges 10, as may in fact occur in repeated use of the mold sections. The handle, by reason of the plane of its projection relative to the clamping section 2, will, when in clamping relation, rest closely adjacent the free edges of the angle-iron sections 10, as shown in Fig. 1, thus avoiding undue projection, while at the saine time permitting free lw tothe handle for removing the clamp when desired.

Having thus described the invention, what is claimed as new, is

l. A combined clamp and centering pin for use in aligning the bolt holes in the flanges of moldin sections and for clamping said sections with relation to each other after bolt hole ali nment including a member having jaws to orm a clamp for the flanges, and a cylindrical tapered pin depending from one of said jaws to cooperate with and align the bolt holes of superimposed flanges and to serve as a ivot pin for the operation of the clamp fol owing such aligning function.

2. A combined clamp and centering pin including an element formed to provide clamping jaws, and a cylindrical tapered pin carried by the element wholly beyond the clamping jaws whereb the pin may be used as a centering pin without jaw interference and thereafter serve as a pivot for clamping movement of the jaws.

3. A clamp including a U-shaped clamping section providing clamping jaws, one of the jaws being extended, and a cylindrical tapering pin fixed in such jaw extension.

4. A combined clamp and centering pin operating to center the bolt holes in the lateral flanges of superimposed molding sections and to clamp the flanges together, comprising a clamping member formed to embrace the superimposed flanges and clamp them in fixed relation, and a pin carried by said member of cylindrical tapered form, said pin being operative to initially and perfectly align the bolt holes of the superimposed flanges and following such aligning operation serve as a pivot for the operative movement of the clamp with respect to such flanges while maintaining the aligned relation of the bolt holes.

In testimony whereof .l affix my signature.

ALEXANDER Q. NASH.

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