US2022648A - Tool for extracting tierods from cast concrete - Google Patents

Description

Dec. 3, 1935. s s COLT TOOL FOR EXTRACTING TIERODS FROM CAST CONCRETE Filed Jan. 14, 1935 2 Sheets-Sheet l INVENTOR ATTORNEY 2 Sheets-Sheet 2 INVENTOR 61 6. 025;,-

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m ATTORNEY Dec. 1935- s. s. cour TOOL FOR EXTRACTING TIERODS FROM CAST CONCRETE Filed Jan. 14, 1935 Patented Dec. 3, 1935 UNITED STATE PATENT OFFICE TOOL FOR EXTRACTING TIERODS FROM CAST CONCRETE 12 Claims.

This invention relates to a novel tool for withdrawing form tie-rods from cast concrete, for tightening up form holding devices, and for similar uses.

This invention has for its principal object to provide a novel and easily manipulated tool for the above-named and similar purposes, wherein means are provided for gripping a form tie-rod end in combination with means for imparting motion to the gripping means to thereby transmit such motion to the tie-rod for loosening and thereupon withdrawing the same from a finished concrete mass, or by so gripping a fixed form tierod utilizing the tool movement for pressing home form wall structures to desired assembled relation.

The invention has for a further object to provide a novel tool for the purposes described, com}- prising an abutment means, a frame movable relative to said abutment means, lever means operatively interconnected between said abutment means and frame for producing relative movement therebetween, and a rod gripping means carried by the frame, means being provided for moving the rod gripping means into and out of gripping relation to a rod.

Other and more specific objects of this invention, not at this time more particularly enumerated, will be understood from the following detailed description of the same.

Embodiments of this invention are shown in the accompanying drawings, in which:--

Fig. 1 is a side elevation of the novel tool according to this invention as applied to a tie-rod, the tie-rod gripping means being shown by full lines in released relation to the rod, and by dotted lines in gripping relation thereto; Fig. 2 is a top plan view of the tool; Fig. 3 is a fragmentary transverse section, taken on line 33 in Fig. 1;. Fig. i is a fragmentary horizontal section, taken on line 44 in Fig. 3; Fig. 5 is a longitudinal sectional View of the tool in operative relation to a tie-rod, ready for manipulation; and Fig. 6 is in part a side elevation and in part a longitudinal section showing the operation of the tool for transmitting extracting movement to the tierod.

Fig. '7 is a fragmentary view showing a modified means for producing relative movement between the abutment means and frame of the tool.

Fig. 8 is a fragmentary transverse section through the abutment means showing a sleeve therein for reducing the diameter of its bore to fit small sizes of tie-rods.

Similar characters of reference are employed ensuing setting or hardening of the same, the 10 form walls are removed, the tie-rods remaining imbedded in the concrete mass. Sometimes the projecting ends of the tie-rods are cut off and the bodies thereof left imbedded in the concrete. This is not desirable, since it involves waste. desirable, where possible, to withdraw the tie-rods from the finished concrete so that the same may be used over again. Apparatus for loosening and withdrawing such tie-rods from finished concrete as heretofore provided has not been entirely sat- 20 isfactory, for the reason that the use and manipulation thereof was frequently difficult and arduous, and operated toso bend and distort the tierods, that considerable additional labor and loss It is 15 of time was involved in straightening the same 25 before they could again be used, all of which offset the economical advantages otherwise attainable by such salvaging of the rods. This novel tool, which is the subject of this invention, has been designed not only with the view of providing a powerful and yet easily manipulated tool for the purpose, but also a tool which so functions in withdrawing the rod that tendency to bending and distortion thereof is avoided.

The novel tool according to this invention com" prises an abutment means preferably in the form of a collar or tubular sleeve I2, having an annular lateral flange or footing means l3 at one end thereof. Adjacent to its opposite end, said collar or sleeve I2 is provided with an externally 40 disposed perforate fulcrum ear or lug [4, to which is pivotally attached, by a pivot pin' l5, the bifurcate end it of a crank-lever ll. Said cranklever I1 is provided with an outwardly projecting hand-lever [8 for manipulating the same.

Pivotally attached to said crank-lever i1 is a frame structure comprising side pieces l9 respectively disposed on opposite sides of the cranklever l1 and connected thereto by a cross bolt 20 which extends through ends thereof and said crank-lever. Integral with thus connected ends of said frame side pieces are downwardly extending arms 2|, which straddle and terminate below said collar or sleeve l2. Connected by a cross-bolt 22 between the lower free ends of said frame arms 2! is a longitudinally and outwardly extending stationary handle member. This handle member preferably comprises a pair of laterally spaced apart 23, between the outer ends of which is secured the attachment lug of a hand or push-piece 25, whereby the latter is affixed to the outer end of the stationary handle member.

Pivotally mounted on a fulcrum bolt 25 extending between the frame side pieces, at a point intermediate the ends of said frame, is transverse dependent chuck memberZ'l' having an opening 28 therethrough. Formed on the outer face of said chuck member 21 are transverse stop ribs, comprising an upper stop rib 29 above the opening 28 and a lower stop rib 35 below said opening 28. These ribs 29--3E3 bound a seat againstwhich is seated a hardened steel gripping plate 3! having an opening 32 therethrough, which registers with the opening 28 of said chuck member, when the gripping plate is operatively assembled with the latter. Extending V laterally outward from each side of said chuck member 2'! are perforate ears or lugs 33. A detachable clamp plate is provided for binding said gripping plate to said chuck-member. This clamp plate is also provided with lateral perforate ears or lugs 35 to register with the ears or lugs 33 of the chuck member. Fastening bolts 35 are passed through the registered ears or lugs 35-33, thus securing the clamp plate 3 in holding relation to the gripping plate 3!. Integral with and dependent from said chuck member 23 is an arm 37 Pivotally mounted on a cross bolt 38 at and between the outer free ends of the frame side pieces is a dependent swinging lever frame comprising lever bars 39. The lower end of said lever frame is pivotally connected with the chuck member arm 3! by an interconnecting link Ail. Connected with the outer free end portion of the stationary handle member is a slide-piece ll, provided at its under side with a perforate ear 42. Interconnected between said slide-piece car 42 and the lower free end of said lever frame is a pushbar 43. If desired, means may be provided in association with said slide-piece 4! for cooperating therewith to frictionally grip the end of the stationary handle member for thrusting upon the same without moving the slide-piece relatively thereto. This means comprises a gripper bar 54 movable by hand grasping and squeezing pressure to frictionally bind the intermediate handle member between the same and the slidepiece. To hold the gripper bar 44 in such operative relation to the handle member and the slide-piece, the latter is provided at its end portions with webs 45 extending upwardly through the intermediate space between the bars 23 constituting the handle member, said webs having T-head portions 46 to engage over the top side of said handle bars; the gripper bar 44 is provided on its underside at its ends with lugs 61 to engage and ride in the space between the handle bars 23, said lugs having longitudinal projections 48 to underlie portions of said T-heads 45 of the slide piece 4!, thereby holding the gripper bar against displacement from assemble-d relation and yet movable toward and from the handle member and said slide-piece.

It is desirable to provide in connection with the stationary handle member and outwardly of the chuck member 2! and its gripping plate 3!, an adjustable tie-rod support or' rest. This tie-rod support or rest comprises a vertically movable supporting head 19 having a tail piece 58!, vertically movable in guideway 5| provided by a guide plate 52 affixed in the space between the handle bars 23. Said guide plate 52 is provided at its lower end with an internally screw-threaded nut piece 53, through which is threaded anadjusting screw 54 to engage the tail piece 5|) to thereby vertically adjust the supporting head 49 at desired elevation.

If desired a rod retaining means may also be provided in connection with the stationary handle member intermediate the main frame and the slide piece 4|. This retaining means is preferably in the from of a loop or ring 55 having a hinge butt 56 engaged between the handle bars 23 and pivoted thereto by a hinge pin 5'1. When in use, the loop or ring 55 may be upturned at right angles to the handle member, whereby the end of the tie-rod undergoing extraction may be passed therethrough, so as to be retained thereby against wobbling, undue bending, etc. When not in use, the loop or ring 55 may be folded down upon the top of the handle member, and thus out of the way. 7 V V The manner of using the novel tool for a tierod extracting operation is as follows:

The tool may be used either before or after the form walls are stripped away or removed from the faceof the cast concrete mass ID; as shown in the drawings, however, the form walls have been removed, leaving the tie-rod H with a free 6 end portion thereof projecting outwardly from the face of the concrete mass In. Before applying the tool to the projecting end portion of the tie-rod H, the slide-piece '4! is slid on the st-a tionary handle member to its outwardly moved position (shown in full lines in Fig. 1), thereby drawing outwardly the push-bar 43 and thus outwardly swinging the lever frame 39. outward swinging movement of said lever frame 39 imparts, through the link 40, a like swinging movement to the chuck member 21, whereby the gripping plate 3| carried by the latter is disposed in a vertical position transverse to the longitudinal axis of the tie-rod end to which the tool is to be applied (see full line representation of these parts shown in Fig. 1) so that the rod ll extends through the chuck member opening and thence freely through the opening 32 of the gripping plate 3|. With the tool thus arranged, it is ready for application to the tie-rod end, such application being made by sliding the sleeve or collar I2 of the abutment means onto the rod end until the flange or footing means [3 thereof abuts the outer surface of the concrete mass I0, whereupon the hand lever I8 is upswung to the raised position shown in Fig. 1. Such upswinging of the hand lever [B swings inwardly the crank lever I1 and draws the frame l92| to innermost position. This application of the tool accomplished by utilizing the stationary handle member 23 and push-piece 25 to thrust home the tool to the described position, and the operation can be facilitated by grasping both the slide piece 4H and gripper bar 44 in a squeezing hand grip which will bind the slide piece against movement relative to the stationary handle member, and will thus assist in the thrusting home of the tool. After the tool is thus applied to the tierod end, the slide-piece 4! is slid inwardly along the stationary handle member 23, whereby inward motion is imparted to the push-bar 43, which in turn is transmitted to the lever frame 35 and through the link 4G to the chuck-member 21. Such movement swings the chuck member 21 and the gripping plate 3| carried thereby into an ob- The.

lique or tilted relation to the tie-rod (as shown by dotted lines in Fig. 1 and by full lines in Figs. 5 and 6). The opening 32 of the gripping plate 3! is slightly larger in diameter than is the diameter of the tie-rod ll, so that, when tilted in the manner described, the sharp peripheral margins or edges 32 of the gripping plate opening 3! respectively at the upper and lower sides thereof, Will provide biting edges for strongly gripping the tie-rod. The tie-rod portion projecting outwardly beyond the thus engaged gripping plate is sup ported by the support or rest 49 so that bending down or distortion of the tie-rod on extracting manipulation of the tool is prevented. With the tool thus operatively engaged with the tierod, the hand lever i8 is thereupon swung downwardly and outwardly, in turn swinging outwardly the crank-lever ii and thereby producing an outward movement of the frame |B2|, which is transmitted to the chuck member 2'! and gripping plate 3! carried thereby; such movement being relative to the abutment means l2- 13, which is held by its abutment against the surface of the concrete mass iii against opposite yielding movement. Such outward movement of the frame lB-Zi as imparted to the tilted chuck member 2? and gripping plate 3i, causes the latter to increasingly and unyieldingly grip the tierod, so that an outward longitudinal pulling force is strongly exerted upon the latter, thus loosening the same and starting it outwardly from the concrete mass it. At the end of the outward stroke thus imparted to frame iii-24, chuckmember 21 and gripping plate 35, the slide-piece 4| is slid outwardly on handle-member 23, thus swinging outward the lever frame 39 and chuck member 21 to release the gripping plate 3i from biting relation to the rod i i, whereupon the hand lever is again swung upward, thus retracting inwardly the frame Iii-2i to initial position. When the frame is thus positioned the chuck-member and gripping plate is again tilted to engage the latter in biting relation to the tie-rod, whereupon the operations are repeated to produce another outwardly pulling impulse to the tie-rod. These operations may be repeated to draw out the tierod step by step until the same is entirely released from the concrete mass iii, or sufficiently loosened to be directly entirely withdrawn by hand. As the rod is shifted outwardly, its extended end portion may be passed through the guide ring or loop 55, so as to be retained thereby against wobbling or accidental bending or distortion during further manipulation of the tool.

It frequently happens that once a tie-rod is loosened relative to the concrete mass in which it is imbedded, and started outwardly by operation of the tool, the rod may thereafter be entirely withdrawn by directly applied outwardly pulling force. Means are therefore provided for affixing the abutment means l2-i3 to the tierod so that the tool may be used for such direct hand pulling operation. This means comprises one or more set-screws 58, threaded through a laterally projecting neck 59 provided in connection with the sleeve or collar l2. When this; setscrew is tightened, the sleeve or collar I 2 is thereby locked to the tie-rod so that direct outward pulling upon the tool is transmitted to said rod. When the set screw is thus set to lock the sleeve or collar l2 to the tie-rod, the tool may also be turned about its longitudinal axis, thereby to twist the tie-rod in the concrete in aid of loosening the same therein preparatory to rod extracting operations. Another use forthe set-screw 5B is to provide means for applying and fixing in the bore of the sleeve or collar i2 bushing sleeves 69 (see Fig. 8) which may be employed to reduce the diameter of the sleeve bore to adapt the same to snug fitting of tie-rods of smaller than maximum diameter receivable therethrough.

In addition to the functioning of the tool as a means for extracting tie-rods from finished concrete, the same may also be used in tightening up forms preparatory to casting concrete.

In making the latter use of the tool, the same is applied to a projecting end of a tie-rod, the op posite end of which is suitably anchored, and with the gripping plate 3! engaged 'to grip or bite the rod, the hand lever it is swung down, whereby 15 inward thrusting movement is imparted to the abutment means l2i3, to cause the same to exert inward thrusting pressure upon the form wall structure against which it is abutted. By

this operation the form wall assembly is tightened up and held while permanent form holding means are applied and secured, all as is well understood by those skilled in the art of erecting such forms.

Referring to Fig. 7 of the drawings, there is illustrated therein a modified form of means adapted to produce relative movement between the abutment means l2i3 and frame |92l. This modified arrangement comprises the provision of a longitudinal row of rack teeth. 6!

upon the exterior of said sleeve or collar 52, with which meshes a toothed quadrant pinion 62, rotatably mounted on the cross-bolt of the frame l9-2l, said pinion having a radial neck-portion 63 to which is aifixed and from which extends an actuating hand lever 64.

From the above description it will be apparent that a very serviceable and easily manipulated and yet powerful tool is provided for the various purposes above referred to. I am aware that many changes may be made in the above described constructions, and many apparently different embodiments of this invention could be made without departing from the scope thereof; it is therefore intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

1. In a tool of the kind described, an abutment means having a passage through which a rod may extend, a frame longitudinally movable relative to said abutment means, a stationary handle means extending outwardly from said frame, a rod gripping means pivotally suspended from said frame, means slidably related to said stationary handle means for moving said gripping means into and out of gripping relation to a rod, actuat ing means interconnected between said abutment means and frame for producing relative movement therebetween, and a handle for said actu ating means.

2. In a tool of the kind described, an abutment means having a passage through which a rod may extend, a frame longitudinally movable relative to said abutment means, a stationary handle means extending outwardly from said frame, a rod gripping means carried said frame, means for moving said gripping means into and out of gripping relation to a rod. means carried by and movable relative to said stationary handle means for operating said means for moving the gripping means, actuating means interconnected between said abutment means and frame for producing relative movement therebetween, and a handle for said actuating means.

3. In a tool of the kind described, an abutment means having a passage through which a rod may extend, a frame longitudinally movable relative to said abutment means, a stationary handle means extending from the lower inner end of said frame outwardly therefrom, a rod gripping means pivotally suspended from said frame, said rod gripping means comprising a chuck-member and a rod gripping plate carried by said chuck-memher and having an opening through which a rod may extend, said chuck-member being movable to cant said gripping plate on the rod to engage opposite edges of the plate opening in biting and gripping relation to the rod, means slidably related to said stationary handle means and pivotaliy connected to the free end of said chuck member for canting the latter, actuating means 7 interconnected between said abutment means and frame for producing relative movement therebetween, and a handle for said actuating means.

4. In a tool of the kind described, an abutment means having a passage through which a rod may extend, a frame longitudinally movable relative to said abutment means, a stationary handle means extending from the lower inner end of said frame outwardly therefrom, a rod gripping means, said rod gripping means comprising a chuck-member and a rod gripping plate carried by said chuck-member and having an opening through which a rod may extend, said chuckmember being movable to cant said gripping plate on the rod to engage opposite edges of the plate opening in biting and gripping relation to the rod, means carried by and movable relative to said stationary handle means for operating said "chuck-member and gripping plate, actuating -means interconnected between said abutment means and frame for producing relative movement therebetween, and a handle for said actuating means.

5. In a tool as defined in claim 3, a vertically adjustable rod rest carried by said stationary handle means outwardly of said chuck-member and gripping plate.

6. In a tool as defined in claim 4, a vertically adjustable rod rest carried by said stationary 9. In a tool of the kind described, an abutment means having a passage through which a rod may extend, a frame longitudinally movable relative to said abutment means, a stationary handle means extending from the lower inner end of said frame outwardly therefrom, a chuck-member pivotally dependent from said frame outwardly of said abutment means, a rod gripping plate carried by said chuck-member and having an opening through which a rod may extend, said chuck-member being swingable to cant said gripping plate on the rod to engage opposite edges of the plate opening in biting and gripping relation to the rod, a lever means pivotally dependent from the outer end of said frame, a. link interconnecting the lower end of said lever means and the lower end of said chuckmember, a slide means movable on the outward portion of said stationary handle means, a push-bar interconnected between said slide means and said lever means, actuating means interconnected between said abutment means and said frame for produc ing relative movement therebetween, and a handle for said actuating means.

10. In a tool as defined in claim 9, a vertically adjustable rod rest carried'by said stationary handle means outwardly of said chuck member.

11. In a tool as defined in claim 9, a rod retaining loop means mounted on said stationary handle means intermediate its free end and said frame.

12. In a tool as defined in claim 9, a vertically adjustable rod rest carried by said static-nary handle means outwardly of said chuck-member, and a rod retaining loop means mounted on said stationary handle means intermediate its free end and said frame.

SAMUEL S. COLT.

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