US2376251A - Device for pulling steel pins - Google Patents

Description

. g r y 1945- s. A. HOWERTON 2,376,251

DEVICE FOR PULLING STEEL PINS 1 Filed Sept. 4, 1943 gwmw . Jamzaellfibzwfian 7%? 4 Patented May 15 1945 .1 ,if

2,376,251: nEvIoE" es PULLING's rEEL PINS 'Sam'uel'Af Howerton, Edwardsville, Ill. n n eauen September 4, 1943 Serial No. 501,315

' ioiaia. o1.254' 23) 'Theinventionrelates to devicesintended primarily for pullin steel. pins and thelike from steel forms which are used in layingconcrete.

crete without the necessity for the operator stepping upon the concrete and without disturbing the concrete during the curing process. It will be obvious that while the invention is primarily intended for the pulling of steel pins from concrete forms it may also be used for other purposes, such as extracting nails, spikes, and the like.

The invention in its preferred embodiment includes a pair of lazy tongs provided with gripping jaws, the tongs being actuated by a lever hingedly supported upon an upright post or the like, although, if desired, other actuating means for the lazy tongs may be employed without departing from the spirit of the invention.

The invention will be more'readily understood by reference to the accompanying drawing, in

' which is set forth an illustrative embodiment of the inventive thought.

In the drawing:

' Fig. Us a perspective of the entire assembly including the upright supports, the operating lever and the gripping tongs;

Fig. 2 is a detail view showing the novel features of the gripping jaws.

Referringin detail to the drawing, A indicates I an upright support of any suitable construction;

B a lever pivotally mounted at any desired height on theupright support; and C denotes a pair of lazy tongs supported at one end of the lever and provided with gripping jaws for engaging a steel pin or the like.

As shown, the lazy tongs include a pair of steel.

owing to the fact that the jaws are pivoted at l2,

would necessarily cause the jaws to meet at an To avoid this difficulty the jaws are twisted or turned sufiiciently so that the jaws will be in substantially the same plane when their meeting edges contact in the gripping position. To permit the jaws to engage a-small pin or the like each of the jaws is notched to providea central opening [5 to permit the shank of a pin or the like to pass therethrough, while at the same time permitting the edges of the jaws to contact beyond the margin of the opening. The jaws are suitably tapered adjacent the central opening so as to enable the jaws to contact the head of a pin even though only a very small portion thereof is exposed.

As shown in Fig. 1 one of the steel strips is preferably provided with an integral extension I! which may be bent to provide a handle portion I8, by means of which the jaws may be caused to initially contact the pin and may be held in contact therewith until the jaws are caused to tightly grip the pin on operation of the lever B. The members l0 and II are pivotally connected at l9 and 20 to links 2| and 22 which complete the lazy tongs, which links are shown as provided with suitable openings 26, 25, through which is threaded an eye 23 of a bolt 24 which may be secured by means of a nut 25 through an opening in one end of the lever B. It will be uhderstood, of course, that the ring 23 is closed after having been threaded through the openings 26, 26 in the links 2|, 22.

The operation of the device will be apparent from the foregoing description. To grip the pin or the like the support A is set up adjacent such pin and the gripping jaws of the lazy tongs are lowered and'broughtinto contact with the pin by means of the handle IS. The operating lever B is then actuated by pressing down on the handle, thus lifting the ring 23'and causing the pivot portions l9 and 20 of the lazy tongs to approach one another and at the same time causing the jaws l3 and 14 to tightlygrip the pin, which pin is lifted as the operating lever B continues to be lowered. It will be noted that owing to the peculiar shape of the jaws l3 and M a firm grip upon the pin or the like is insured. Furthermore, owing to the presence of the handle [8 it is possible to properly locate the jaws so that they will not slip when the operating lever B is first actuated. Furthermore, the curvature of the ring portion 23, which is mounted through the links 2| and 22, insures a smooth but very firm gripping operation.

It will be apparent that the upright or standangle, thus interfering with their. gripping action. '55 ard A may be operated from a location adjacent pull steel pins from forms used in laying cone; crete; comprising an upright support adaptedto be positioned adjacent the pin to be pul-led' and" having hinge receiving apertures at varying levels, a hinge member retained in one of said apertures, an operating lever hingedly mount ed intermediate'its ends on said upright bymeans. of said hinge member, and pin pulling means of the, lazy 'tongs'. type 'swingingly. mounted adj acent oneeend'roft the: lever,: saidipullingl. means ainclud-iing a pair ofi'flatmetai strips pivoted; intermedi: ate their ends and having; gripping. jaws .at one end thereofieach bent. at'1substantiallyr right angles to the plane of the face of the strip from which it is formed and turned sufficiently to bring the bottomsurfaces of the jaws into substantially the same plane in closed position, each of the jaws being similarly notched to provide a central opening to permit the shank of a pin to be engaged by the margins of the jaws adjacent said opening while permitting the edges of the jaws to substantially contact beyond the margins of theopening, the jaws being taperedjadjacent the central opening so as to enable the jaws, to firmly grip the end of a pin even though only a small I portion of the pin is exposed, flexible supporting means for said pivoted strips comprising a pair of links loosely mounted at the end of said operating lever, and pivoted to the ends of the metal strips opposite the gripping jaws, one of said pivoted-stripshaving-a'rigid extension handle inte- SAMUEL, HOWERTON.

Images