US2164031A

US2164031A - Means for extracting form ties from cast concrete

Info

Publication number: US2164031A
Application number: US241886A
Authority: US
Inventors: Samuel S Colt
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-11-23
Filing date: 1938-11-23
Publication date: 1939-06-27
Anticipated expiration: 1956-06-27

Description

June 27, 1939. s, 5 CQLT 2,164,031

MEANS FOR EXTRACTING FORM TIES FROM CAST CONCRETE Filed Nov. 23, 1938 2 Sheets-Sheet l 42 I lgf/5 /7 212/ /o 26 F/Zf/Z 4'5 Il, a? I Z6 if /2 a A f I 2" f/J 47 l I d [l/ Li um j b Z7 TL- A@ o 2s 5' y I 5 l ATTORNEY.

vJune 27, 1939. s. s. coLT 2,164,031

MEANS FOR EXTRACTING FORM TIES FROM CAST CONCRETE BY M @d Mh ATTORNEY.

Patented June A27, 1939 MEANS FOR EXTRACTING FORM TIES FROM CAST CONCRETE Samuel S. Colt, West Orange, N. J. Application November z3, 193s, serial No. 241,886

9 Claims.

This invention relates to improvements in devices for withdrawing form Wall tie rod-s, wires 4and the like from east concrete, -and for like operations; and the invention has reference, more particularly, to anV improved tool for such purposes of :the general type and kind shown in my `.co-pending application for United States Letters. Patent Ser. No. 205,698, ,filed on or about May 3, 1938,

This invention has for an object to provide ina tool of the type mentioned a novel form and arrangement of rod soiling sheer cam block in combination with the rod winch roll and gripper means, whereby said sheer cam block is adjustably supported relative to the winch roll, and in such manner as to provide an auxiliary supporting bearing therefor.

Another object of the invention is to provide means to bear the thrust of spacer Washers with "which form tie rods are often provided, whereby said washers are held immovable and'free from the risk of distortion While the tie rod is being extractedfrom a concrete mass and coiled by the functional operation of the tool in use.

Another object of this invention is to provide means for reenfnrcing both the tool lever against distortion and-the winch roll .against displacement `under stresses to which the tool is subjected in use. Y f

i-Stillanother object .of the invention'is to provide manipulatable means for securing relatively movable parts of the tool in folded together relation `wheny the tool .is not in use, and While being carried about'from place to place.

"Other objects: of this invention, not at this time more particularly enumerated, will be understood from the 'followingV detailed description of the same. n

An illustrative embodimentof the present invention is shown inthe accompanying drawings, in which: l i

Fig; lis :a side elevation of thenovel rod pulling tool as applied to the Work in the performance of its functions; Fig. 2 is a top end elevation ci the same as viewed dovmwardly in Fig. l; Fig. 3 is a view showing a spacer washerequipped tie rod,`as relatedto'a concrete mass prior to extracting the rod from said mass; Fig. 4 is a front elevation of the `novel tool; and Fig. V5 is a vertical -c'r'oss sectional view of the same; taken on `line 5-5 in Fig. l. I i

Fig. Y6 lsa side elevation ofthe novel tool as folded togetherwithits parts secured against relative movement, and `thus subject to be conveniently carried about from place to place.

Similar characters of reference are employed in the above described? views, to indicate correspend-ing parts. v

Referringto the' dr wings, the 'referencechar- `21361281.' 10 indicates a astconcetemass `.from a face of which a wall of the form in which the mass was cast has been removed, leaving exposed a projecting end of an imbedded form wall tie rod I I desired to be extracted from the concrete mass.

In many instances spacer discs or washers I2 are affixed o-n the tie rods II against inward movement thereon, as by means of stop projections I3 (see Fig. 3) raised out of the rod material behind the discs or washers, whereby the form wall, by abutting the thus xed discs or washers, is held against inward displacement relative to the form interior prior to casting concrete therein. After the concrete has been cast and set, and theform dismantled, it is desirable, when extracting a tie rod, to` hold the disc or washer immovable and to pull the rod'therethrough as the latter is drawn outward, thus preventing the disc or washer from interfering with thev desired and efficient operation of the rod extracting tool.

The novel tie rod extracting tool, according to the instant invention, comprises a foot plate I4 from which outwardly projects a bearing bracket I5 pro-vided with a laterally disposed bearing hub I6. Mounted on said hub I6 is a pivoting spindle or journal bolt I1. Fulcrumed on said journal bolt I'I is a hand lever I8. Also mounted on said journal bolt I'I, adjacent to one face of said hand lever I8, is a freely rotatable winch-roll I 9. Aihxed tothe hand lever I8,-so as to spring from its other face, is a reenforcing member or yoke bar 20 having an offset leg portion 2l which abuts the bearing hub end, 'and through which the journal bolt ll also extends, the assembly being retained in place by anut 22 which engages the journal bolt Il. The provision of said reenforcing member or yoke bar stiiens the hand lever against distortion, and also reenforces the mounting of the Winch-roll so that true running rotation thereof is assured.

Mounted on the hand lever Iain parallel spaced relation thereto andv above the winch-roll I9 is a strap-member 23 to form with said hand lever a bifurcate mounting for'the support of a releasable rod cr wire gripping means .to cooperate with said Winch-roll I9. Said wire gripping means comprises an eccentric gripper-head 24 having gripper serrations or teeth 25 formed on peripheral portions thereof, and the same is pivotally mounted on la transverse pivot pin 26 which is supported by and between the hand lever I8, said strap-member 23, and said leg portion 2l, being fixed against displacement by cotter pins 25'. This disposition and mounting of the pivot pin 26 also assists in stiffening the assembly of hand lever I8, strap 23 and yoke bar 2B and its leg 2I against relative displacement or distortion. Extending from said `gripper head 24 is a lever arm 2l for manipulating the same. f.

Cooperating withtsaidwinch-rloll I9 is a sheer cam block 28, theiis'ame being supported by the bracket I5 between said winch-roll I9 and the foot plate I4, but so as to be adjustably disposed relative to the former. The means for thus supporting the sheer cam block comprises a stud bolt 29 which extends. through a slot 30 formed in the bracket I5 so as to screw into the at inner side 3| of said sheet cam block 28 which is contiguous to said bracket I5. Preferably said stud bolt 29 is provided with an elongated collar 32 mounted thereon between its head 33 and the bracket I5. The outer side of said sheer cam block 28 is formed to provide a sheer cam face 34 in shape of an upwardly and outwardly inclined spiral plane. The top end 35 of said sheet cam block lies in a plane horizontally tangent to the top side of said winch-roll I9. Associated with the rearward side of said sheer cam block 28 are one or more adjusting screws 35 which thrust against the foot plate I4 to which they are opposed. The forward side of said sheer cam lock is provided with a curvilinear bearing face 31 adapted to fit against the side of the winchroll I9 to which it is opposed, thus bracing and supporting said winch roll against the stresses exerted by an outwardly pulled tie-rod thereon. By slightly loosening the stud bolt 29, and then adjusting the screw or screws 36, the sheer cam block 28 may be moved relative to and into the described supporting or bracing relation to the winch-roll I9, after which adjustment is made, the stud bolt 29 is again tightened. Any wear between the winch-roll and sheer cam block can therefore be compensated for as may be from time to time necessary. Said sheer cam block is so shaped as to provide a portion having a face surface 28 substantially parallel to the plane of the oot plate I4 and disposed to lie in the path of swinging movement of said hand lever I8, thus serving, by its lower portion, as a stop to .limit the down-swinging movement of said hand lever I8, and, by its upper portion, a stop to limit the up-swinging movement of said hand lever i8.

Provided in the upper end portion of the foot plate I4 is a downwardly indenting slot or way 38 through which the exteriorly projecting end of a tie-rod II may extend to pass over the top of the sheer cam block 28 and thence to and around the winch-roll. Said sheer cam block 28 is further provided at its upper end with a guide projection 39 by which the outwardly extending tie-rod portion is retained against displacement as it passes to and over the winch-roll i9.

The means to support a spacer disc or washer against the thrust of an outwardly moved tierod l I provided with the same, comprises a stoppiece 48 of a width corresponding to the width of the foot plate slot or way 38, said stop-piece being so mounted as to be movable to either an operative position wherein it is disposed within said slot or way 38 above the tie-rod passing therethrough and ush with the concrete contacting face of said foot plate I4 so as to engage the spacer disc or washer I2, or to an inoperative position wherein it is withdrawn from said slot or way 38 and laterally offset therefrom, so as to leave the slot or way 38 unimpeded for entrance thereinto of the tie rod when the tool is applied to a concrete mass from which it is desired to extract said rod.

One means for mounting said stop-piece 49 so as to be capable of the selective operative or inoperative dispositions above mentioned, comprises the mounting of said stop-piece 4I) on a carrier bar 4I which is both slidable and rotatable relative to a supporting bearing 42 therefor; said bearing being suitably aixed to said foot plate I4. The stop-piece 40 is provided with a nger piece or lever arm 43 for manipulating the same and its carrier bar 4I. A stop-pin 44 which is afiixed to and projects from the foot plate I4 limits the sliding movement of the carrier bar and stop-piece so as to determine the operative register of the latter with the slot or way 38. A second stop-pin 45 carried by the stop-piece, by abutting the face of the foot-plate I4 limits the rotary movement of said carrier bar and stoppiece so as to determine the operative entered disposition of the latter into the slot or way 38, and into abutting relation to a spacer disc or washer I 2.

In the use and operation of the tool, after a form wall has been removed from the concrete mass I8, and the projecting end portion of a tierod I I is thereupon rendered accessible, the novel tool is applied to the latter. To so apply the tool, the foot plate I4 is abutted against the face of the concrete mass IU in such manner that the tie rod extends through the slot or way 38 and thence across the top of the sheer cam block 28 and over the top of the winch-roll I9, whereupon the gripper head 24 is swung downwardly to engage the tie rod II with its serrations or teeth 25, thus gripping the tie-rod between the winch-roll and said gripper head. If the tie-rod II is equipped with a spacer disc or washer I2, the stop-piece 48 is operatively entered through the slot or way 38 so as. to engage that portion thereof exposed through the slot or way, the remaining portions being abutted by those parts of the foot plate I4 contiguous to the slot or way 38, thus firmly supporting the disc or washer around its entire circular extent.

Preparatory to operating the tool, the free end portion of the tie-rod II, which projects outwardly beyond its point of infringement upon the winch-roll I9, is bent at right angles to the rod axis, to form the bent portion Il', thus so disposing the free end of the tie-rod as to assure its clearance of the tool parts, when by operation of the latter coiling or winding of the same takes place coincident with extracting movement thereof.

With the tool thus applied, the hand lever I8 is oscillatingly swung back and forth, thereby drawing outward the tie-rod, and at the same time bending the same around the winch-roll I9. As such bending of the rod continues, the bent portions will be carried into engagement with the sheer cam face 34 of the block 28, and, as moved in contact therewith, will be caused to sheer outwardly in a spiral path, thus progressively coiling the tie-rod as it is extracted and until it is entirely withdrawn, after which the tool is removed from the concrete mass, whereupon said tie-rod may be removed laterally off the winch roll, freeing the tool for further use.

When it is desired to carry the tool about frotn place to place, the same may be conveniently collapsed, and its parts axed together against relative movement in the following manner and by the following means.

Aixed to the foot-plate I4 is a perforate ear or lug 46, upon which is pivotally mounted a latch-hook 41 by means of a pivoting bolt 48 and clamping wing nut 49.

To collapse the tool, the handle lever I8 is swung to a position parallel in plane to the foot plate I4, whereupon the latch-hook 4'I is turned to engage its hook-end over a portion of the pivot pin 26. When the latch-hook 41 is thus engaged,

the wing nut 49 is tightened to secure the same against displacement. It will be obvious that the latch-hook 41, as thus operatively disposed, ties the foot plate I4 and handle lever I8 together against relative movement, thus securing the tool in a collapsed condition for convenient carrying about.

I am aware that various changes could be made in the construction of the above described tool, and many apparently Widely different eimbodim'ents of the novel features of the present invention could be made Without departing from the scope thereof as dened by the following claims. 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.

I claim:

1. In a tool for the purposes described, a foot plate, a hand lever fulcrumed in connection with said foot plate, a winch-roll rotative about the fulcrum of said hand lever, gripper means mounted on said hand lever for cooperation with. said winch-roll, and a sheer cam block adjustably mounted intermediate said foot plate and winch-roll and having a bearing face to abut the circumferential face of said winch-roll in sup-A porting relation thereto.

2. In a tool for the purposes described, a foot plate having a Way for the extension of a tie-rod'A or the like therethrough, a hand lever fulcrumed in connection with said foot plate, a Winch-roll rotative about the fulcrum of said hand lever, gripper means mounted on said hand lever forl cooperation With said Winch-roll, a sheer cam. means cooperative with said Winch-roll, and a spacer disc or Washer stop-piece movably mount-v ed relative to said foot plate for operative disposition at will across and Within the Way thereof.

3. In a tool for the purposes described, a foot plate, a hand lever fulcrumed in connection with said foot plate, a Winch-roll rotative about the fulcrum of `said hand lever, gripper meansy mounted on said hand lever for cooperation vvith` said Winch-roll, a sheer cam block adjustably mounted intermediate said foot plate and winchroll and having a bearing face to abut the cir-- cumferential face of said winch-roll in support-- ing relation thereto, said foot plate having a Way for the extension of a tie-rod or the like therethrough, and a spacer disc or Washer stop-piecel tmovably mounted relative to said foot plate for operative disposition at will across' and Within the way thereof.

4. In a tool for the purpose described, a foot plate, a hand lever fuiorumed in connection with said foot plate, a winch-roll rotative about the: fulcrum of said hand lever, gripper means: mounted on said hand lever for cooperation with'. said winch-roll, a sheer cam means cooperative: with said winch-roll, and releasable means for' immovably holding said hand lever in collapsedl folded relation to said foot plate.

5. In a tool for the purposes described, a foot plate having a way for the extension of a tie rod or the like therethrough, a. bearing means'y carried by said foot plate, a hand lever fulcrumed. on said bearing means, a Winch roll rotativeY about the fulcrum of said hand lever, gripper means mounted on said hand lever for coopera tion with said winch roll, a. sheer cam block. mounted intermediate said foot plate and winch.

roll, and said block having portions lying in the path of movement of said hand lever and adapted to provide stops to limit the swing of said hand lever in each direction of its movement.

6. In a tool for the purposes described, a foot plate having a Way for the extension of a tierod or the like therethrough, a bearing means carried by said foot plate, a hand lever fulcrumed on said bearing means, a winch roll rotative about the fulcrum of said hand lever, gripper means mounted on said hand lever for cooperation with said winch roll, a sheer cam block mounted intermediate said foot plate and Winch roll, said block having portions lying in the path of movement of said hand lever and adapted to provide stops to limit the swing of said hand lever in each direction of its movement, said sheer cam block having a bearing face to abut the circumferential face of said winch roll in supporting relation thereto, and means for adjusting said block relative to said Winch roll.

'7. In a tool for the purposes described, a foot plate having a Way for the extension of a tierod or the like therethrough, a bearing means carried by said foot plate, a hand lever fulcrumed `on said bearing means, a winch roll rotative about the fulcrum of said hand lever, gripper means mounted on said hand lever for cooperation With .said Winch roll, a sheer cam block mounted intermediate said foot plate and Winch roll, said block .having portions lying in the path of movement of said hand lever and adapted to provide stops to limit the swing of said hand lever in each direction of its movement, and a spacer disc or washerv SOD piece movably mounted relative to said foot plate for operative disposition at will across and 'within the way of the latter.

8. In a tool for the purposes described, a foot plate having a Way for the extension of a tie-rod or the like therethrough, a bearing means carried by said footl plate, a hand lever fulcrumed on .said bearing means, a winch roll rotative about the fulcrum of said hand lever, gripper means :mounted on said hand lever for cooperation with `said winch roll, a sheer cam block mounted inter- :mediate said foot plate and winch roll, said block lhaving portions lying in the path of movement -of said hand lever and adapted to provide stops to limit the swing of said hand lever in each direction of its movement, said sheer cam block Ihaving a bearing face to abut the circumferential ace of said winch roll in supporting relation "thereto, means foradjusting said block relative 'to said winch roll, and a spacer disc or washer .stop piece movably mounted relative to said foot plate for operative disposition at Will across and within the way of the latter.

9. In a tool for the purposes described, a foot jplate, a bearing means including a bearing hub, ya journal bolt extending through said bearing means and its hub, a hand lever fulcrumed on .said journal bolt, a winch roll adjacent said hand .lever and rotative on said journal bolt, a reen- :forcing yoke bar having one end fulcrumed on the journal bolt at the outer end of said bearing :means hub and its other end fastened to said ihand lever, a gripper means also mounted on said .'hand lever for cooperation with said Winch roll, and a sheer cam block mounted intermediate said :foot plate and said winch roll and cooperative with the latter.

SAMUEL S. COLT.