US1960502A

US1960502A - Tie clamp

Info

Publication number: US1960502A
Application number: US397857A
Authority: US
Inventors: Howard O Mcmillan
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-10-07
Filing date: 1929-10-07
Publication date: 1934-05-29
Anticipated expiration: 1951-05-29

Description

May 29, I934- H. o. MCMILLAN 1,960,502

TIE CLAMP Filed OG'I'.. 7. 1929 4 Sheets-Sheet 1 May Z9, 1934. H. o. MCMILLAN TIE CLAMP Filed Oct. 7, 1929 4 Sheets-Sheet 2 May 29, 1934. H. o. MCMILLAN TIE CLAMP Filed Oct. 7, 1929 4 Sheets-Sheel 5 IN vE/v Tw?. #aw/M0 0. QN/Lum.

May 29, 1934. H. o. McMlLLAN TIE CLAMP Filed Oct. 7, 1929 4 Sheets-Sheet 4 Patented May 29, 1934 UNITED STATES Howard O. McMillan, Minneapolis,

Application Uctober 7,

9 Claims.

This invention relates to a device used for concrete work, and particularly to a tie used for concrete forms in making walls. While the invention may be used for tying theforms for any kind of concrete wall, it'particularly is designed for making blind ties. With such ties, the wall is iinished so that a tie is not visible at the faces of the wall, the wall being pointed or iilled with material which obscures the tie. If the ties projectto the outer face of the wall or extend through the surface of the wall, they rust when water is present and the water and rust run down the side of the wall, making an objectionable stain. The oxidation of the iron loosens the concrete around the tie and it crumbles and breaks away from the end of the tie with a spalling action, thus making an objectionable hole. These objections are eliminated when blind ties are used.

it is an object of this invention, therefore, to provide a simple and eiiicient tie for a concrete form, by means of which blind lties may be produced.

It is a further object of the invention to provide a simple and emcient device for producing a tie for concrete forms, including a tie extending between the sides of the form and members detachably secured thereto extending therefrom and adapted to cooperate with the timbers at the sides of the form, and wedge means for moving said last mentioned members inwardly to tighten the form, together with means covering the ends of said tie and members for protecting the same against the concrete and which are removable after the form'fis removed.

lt is another object of the invention to provide a simple andliiicieri1 clamp or tie for a concrete form having spaced" falls comprising a member extending between said walls and terminating at the inner sides thereof, members having a detachable connection with the ends of said member, and bars pivotally connected to said last mentioned members extending to the outer sides of said walls respectively, said bars having spaced slots therein and wedge means for relatively mov- 45 ing said bars and walls -to tighten said clamp and form and hollow cone members with flanged open ends surrounding the ends of said rst mentioned member and said last mentioned members and abutting the inner sides of said walls.

It is still another object of the invention to provide a clamp for a concrete form having spaced walls comprising a member extending between said walls and membershaving a detachable connection with the endsof said member and extending to the outer sides of said walls iszaseriai 10.397.851

(c1. :as- 131) PATENT @El-ica f respectively and having spaced slots therein, means 'for relatively moving said latter members and said walls to'tighten said clamp and form, hollow members with anged open ends being provided surrounding the ends of said last mentioned members and abutting the sides of said wallstogether with a hollow member surrounding said first mentioned member and abutting the inner ends of said hollow members.

It is more specically an object of the invention to provide a clamp for aconcrete form including a tie adapted to form a blind tie comprising a rod extending between the walls of said form and spaced from said walls, .members detachably engaging the ends of said rod,

bars pivotally coneral views, and in which:-

Fig. 1 is a view in front elevation showing a concrete form and wall with the device applied thereto;

Fig. 2 is a View partly in side elevation and partly in vertical section showing one end of the device adjacent the form wall;

Fig. 3 is a View in side elevation illustrating one of the tightening means, portions being shown in dotted lines;

Fig. 4 is a vertical section taken substantially on line 4 4 of Fig. 2 as indicated by the arrow; Fig. 5 is a horizontal section taken on line 5-5 of Fig. 3 as indicated by the Fig. 6 is a perspective view of avplate used;

Fig. 'I is a view in vertical section of the wall after the form is removed, illustrating a removal device for certain of the parts;

Fig. 8 is a view partly in front elevation and partly in vertical section showing one side oi.' a concrete form with a modiiied form of the invention applied thereto;

Fig. 9 is a view similar to Fig. 8, showing a further modication;

Fig. 10 is a view similar to Fig. 9 showing another modication;

Fig.`11 is a view similar to another modiiied form;

Fig. 10 showing still against the inner sides of the walls 1 0. Said shells Fig. 12 is a view similar to Fig.`8 showing another modication;

Fig. 13 is a View similar to Fig. 12 showing another modification;

Fig. 14 is a vertical section taken on line 14-14 of Fig. 13 as indicated by the arrows;

Fig. 15 is a view similar to Fig. 11 showing a modified form of the invention;

Fig. 16 is a view similar to Figs. 11 and 15 showing a further modified form of the invention;

Fig. 17 is a view similar to Fig. 16 showing another modification, and

Fig. 18 is a view similar to Fig..l6 showing a further modification.

Referring to the drawings, a form for aconcrete wall is shown, comprising the horizontally extending timbers 10 forming the walls of the form, the vertically extending timbers 11 which will be placed in spaced relation at the outer side of the parts 10 and thehcrizontally extending timbers or whalers 12 engaging the members 11 and extending longitudinally thereacross.

The clamp and tie include a rod 13 extending between the walls 10 and having its ends spaced from the inner sides thereof. The rod has detachably secured to its ends the members 14 and l while these members could be detachably secured to the rod in Various ways, they. are shown as threaded onto the ends thereof. Shells 16 are provided which are shown as frusto-conical 1n shape, having narrow inwardly extending anges 16a at their larger ends, which are disposed are also shown as having narrow inwardly extending flanges 16h at their inner ends, extending over the ends of members 14 and having an opening therethrough slightly larger than the d1'- ameter of rod 13. A pipe 15, the internal d1- ameter of which is somewhat greater than that of rod 13 surrounds said rod and extends between the members 16, said pipe abutting the inner ends of members 16. The members 14 are bifurcated at their outer ends to receive the ends of bars 17 to which they are pivoted by the rivets 18. The bars 17 extend through the

timbers

10, 11 and 12 and are embraced at the outer sides of the timbers 12 by members 19. It will be noted that one of the timbers 12 is shown as a solid timber such as a 4 x 4 or 4 x 6, while the other is a rather wide ange 19h. Lugs 19e project from the sides of members 19 at the sides of each of the slots 19a and set screws 21 are provided, threaded into these lugs. The outer of the lugs 19e is apertured to have connected therein the end link of chain 22 which carries at its other end a wedge member 23 of a size to extend through the slots 19a but wider at one end than the length of said slots. The bars 17 are also provided with a series of spaced elongated slots 17a adapted to aline with the'slots 19a when the bars 17 extend through the members 19. It will be-noted that the slots in

members

17 and 19 are differently spaced and that the slots in one of the members are spaced than the slots inthe other, the slots being substantially the same length in both members.

In Fig. 7 a member is shown for removing the members 16a from the wall, which comprises a bolt or rod 24 having a head 24a at its outer end and its inner end 24h bent substantiallyat a right angle. A block 25 of considerable weight embraces rod 24 and is slidable thereon between portions 24a and 24h.

In operation the rod 13 with the pipe 15 thereon will be disposed between the walls 10 of the form. The members 16 will then be placed on the ends of rod 13, the same engaging the ends of pipe 15. The outer ends of members 16 will engage or be adjacent the inner sides of the walls 10. The members 14 with the bars 17 can then be threaded onto the ends of rod 13, the bars 17 projecting outwardly through the Walls as shown in Fig. 1. The bars 17 .will usually extend between the boards of walls 10, but if desired said walls may have suitable openings for the reception of members 14 less than halfthe distance and 17. The members 19 are now placed in posiwedge 23 is now driven through the slots 19a and into the slots 17a partly alined therewith, and when this is done, themembers 19 are yforced inwardly, thusvmoving the sides of the form inwardly against members 16 and tightening the clamp and form. It the form is not sumciently tight when the wedge 23 isdriven. so as to bring the slots 17a into complete alinement with the slot 19:1,another wedge. can be inserted in the other slot 19a. and through the partially alinedslots 17a, to further draw and move the bars 17. A continuous take-up movement is therefore possible with the

members

19, 17 and the wedges 23. The form is thus drawn up in tight condition with the device arranged as shown in Fig. 1. When the form and clamp are thus tightened the outer ends of members 16 will abut firmly against the inner sides of walls 10 and the inner ends of members 16 will abut the ends of pipe 15.

The concrete 26 is now poured between the walls 10 and will cover and embed the tie rod 13, pipe 15 and the hollow members 16. After the concrete is set, the form constituting the

timbers

10, 11 and 12 will be removed and the wall will then appear as-shown in Fig. 7. To release the form, the wedges 23 will rst be driven out and the members 19 withdrawn from .the ends of bars 17. These bars can now if desired, and if the holes through the timbers will permit, be rotated` t0 screw the members'14 off of the ends of rods 13. When the

members

17 and 14 are screwed otl, one end of rod 13, said rod can be withdrawn at the other side of the form by merely moving outwardly

members

14 and 17 with the rod 13 still threaded in the member 14. The pipe 15 will remain embedded in the wall and extending between the sides thereof, but spaced from said sides. The timbers can then be removed, leaving members 16 in the wall. It will be seen that these members 16' taper inwardly and are not held by the rods 13.

will be positioned as shown in Fig. 7, wlthts inner end hooked over the ange 16a on member 16 and block 25 will be slid outwardly with considerable force against the head 24a. The force of the impact of the block 25 against head 24a is transmitted to shell 16 and the same is withdrawn from the wall. When the shell 16 is removed from the wall it will be seen that there is a frusto-conical recess or cavity in the wall and that the ends of pipe 15 are some distance from the wall surface. These recesses can be lled with concrete or mortar so that the pipes 15 are entirely covered, and there will be no metal projecting at the face of the wall. It will be noted that members 16 have the-flanges 16a extending annularly at their larger ends. These hollow conical members can conveniently be made from sheet steel and can be quickly and easily made by the use of dies. It will be noted that the rods 13 could extend beyond the walls 10 of the form if desired. The rod is removed as stated and only the pipe 15 remains in the wall as a tie. The ends of the pipe of course must terminate inside of the walls 10. Rods 13 are removed and can be repeatedly used.

In Fig. 8 a modied form of the invention is shown in which a rod 30 is used which will extend between the walls 10 but will have its ends spaced from the inner sides of said walls. The ends of rod 30 are threaded and engaged by an internal-y ly threaded thimble 31 screwed on each end of the rod. A bar 32 is provided having a cylindrically threaded end 32a which is also threaded into the thimble 31. Bar 32 extends outwardly through the form either between the boards of walls 10 or through an opening therein. Said bar also extends between the members 11 and through the Whaler 12 and has slidably mounted thereon the member lg'already described. The bar 32 will be provided with a plurality of slots similar to the slots 17a in the bar 17 and the wedge member 23 secured by chain 22 to member 19 will be driven through the slots in memberr 19 and bar 32. The cone members 16 surround the inner ends of bar 32 and engage the member 31 at their inner ends and the walls 10 at their outer ends.

In assembly and operation the rods 30 will be placed in position and members 31 attached thereto. The cone members 16 will then be placed on the inner ends of bars 32 and the latter screwed into members 31. The form can now be tightened by driving the wedges 23 in place. 'I'his draws outwardly on bars 32 moving the form members inwardly so that they are firmly pressed against the members 16 which in turn press against the members 3l. It will b e seen that adjustment can be had of the distance between walls 10 by having rods 30 and the inner portions 32a of bars 32 screwed more or less into the thimbles 31. When the form is taken down, bars 32 can readily be unscrewed from the thimbles 31, the latter remaining in the concrete with the rods 30. Members 16 can be withdrawn in the manner already described.

In the form shown in Fig. 9 a pipe member 33 extends between the walls 10 havingits endsspaced from the inner sides of said walls. The bar 32 is used and the threaded end 32a thereof is screwed into the internally threaded end of pipe 33. Members 16 surround the inner ends of bars 32 and abut against the ends of pipe 33. The bar 32 passes through the member 19 and like bar 1'7 Vhas spaced slots therein, the wedge 23 which is secured to member 19 by the chain 22 being adapted to pass through the slots and

members

19 and 32 to relatively move said bar and member 19. The whaler is illustrated as made of two 2 x4s, the

plate 20 being shown as embracing the edges thereof.

In operation the pipe 33 will be placed between the forms, the cone 16 placed over the inner end of bar 32 and the latter than screwed into the pipe 33. Bar 32 will extend to the outside of the form and

members

19 and 20 can then be placed in po sition and the form and clamp tightened by use of the wedge 23. When the form is taken. down pipe 33 will remain in the concrete, bar 32 unscrewed therefrom and cone 16 removed as already described. In the modification shown in Fig'. 16, a rod 34 is used between the walls 10, said rod having threaded ends which terminate some distance from the inner side of the walls and having formed `integral therewith an angular portion 34a, shown as hexagonal in form. Bars 17 having members 14 pvot-ed to their ends such as shown in Figs. 1 to 5 are used, members 14 being threaded onto the threaded ends of rd 34. 'I'he members 16 surround the ends of members 14 abutting walls 16 at their large ends and abutting the portions 34a at their small ends. Bars 17 are provided, as before described, with the members 19 and the wedges 23, bars 17 and members 19 having slots therethrough as already described.

.In operation the rod 34 will be placed between the forms, members 16 will be placed over member 14 and the latter screwed onto the threaded end of rod 34. The bars 17 will project at either side of the form and the clamp and form. can be tightened by use of wedges 23. When the form is taken down rods 34 will remain in the concrete, bars 17 and members 14 thereon being unscrewed from rods 34 and members 16 withdrawnv as already described. Members 34 are also adapted to be easily removed by the use of an ordinary claw hammer.

In the construction shown in Fig. l1 a pair of bars 35 are provided which bars are of hat rectangular shape and have their end portions 35a bent at right angles in the same direction. Said end portions 35a are apertured to have pass therethrough the rod and threaded end 36a of a bar 36, the outer portion o which is flat and provided with spaced slots as is the bar 17. The threaded portion 36a has an enlarged bifurcated outer end between the sides of which the outer at portion is pivoted. The bars 35 will be placed in oppositely disposed relation with their ends 35a overlapping as shown and the end 36a will extend through the apertures in the end portions 35a and be threaded into a nut 3'? disposed at the inner sides of the end portions 35d. The cone 16 will be disposed about the threaded portion 36a engaging the end of the outermostbar 35 with its small end and engaging the wall 16 with its large end. A nut 38 will be threaded on portiona to abut the outer sides of the walls 16. Bar 36 will be provided with the member 19 together with the wedge 23 secured by the chain 22. The form and clamp can be tightened by use of the wedge 23 as already described.

The bars 35 will iirst be placed in position, together with nut 37, cone 16 will be placed on member 36 and portion 36a thereof will then be passed through the ends of rod 35 and screwed into nut 37. Whenthe form is taken down bar 36 can be unscrewed from nut 37, the latter with bars 35 remaining in the concrete. Cone 16 can then be removed as already described.

In the modification shown in Fig. 12 channel clips 40 are provided having their flanges provided with holes 40a and tie wire 41 has strands thereof passed through said holes and extending from one side of the form to the other, the ends of said wire being twisted together as shown at 41a. The bai` 36 shown in Fig. 11 will be used, the threaded end 36a thereof passing through an aperture formed centrally of the flange of member 40 and being screwed into a nut 42 disposed at the inner side of channel member 40. The cone 16 will surround the inner end portion 36a of bar 36 and will engage the outer side of member 40 at its small end and the inside wall 10 as usual with its large end. A nut 43 may be provided on threaded portion 36a just outside of the wall 10 and engaging the same. Bar 36 will have the member 19 thereon as already described which has spaced slots therethrough as does also bar 36 and wedge 23 will pass through the slots in said members. Said wedge is secured to member 19 by the chain 22.

In operation the rods 36 will be placed Athrough -the form, members 16 being placed thereon as well as the channel clips 40 and nuts 42 will then be placed in position so that bars 36 can be screwed thereinto. If nut 43 is used it will rst be placed on the threaded end of bar 36 before the same is placed through the form. With the members in position as described, the wire 41 can be placed through the members 40 at both sides of the form and the ends thereof secured. When the form is taken down wire 41 together with members 40 and 42 will be left in theconcrete'while bar 36 will be screwed out of nut 42 and members 16 will be removed as already described.

In the form shown in Figs. 13 and 14, a pair o similar bars 44 will be provided, said bars being flat and substantially of rectangular cross section and having end portions 44a and 44b bent upwardly in the same direction at right angles. End 44a will have a threaded aperture 44e therein and the end 44h will have a transverse slot 44d extending thereinto from one edge for quite a distance. A set screw 45 is screwed into the top of end 44h. The bars 44 will be placed in oppositely disposed relation, the: central portion of each bar being inserted in the` slot 44d of the other bar. The bars can be slid so as to be adjustable lengthwise and when in the desired position can be secured in fixed relation by tightening the screws 45. The bar 32 already described will be used and the threaded end 32a thereof will be screwed into the threadedaperture 44c, cone 16 surrounding the end of portion 32a.

In operation the bars 44 will be placed between the forms and adjusted to the desired length. It will be seen that members 44 can `thus be used for walls of different widths. Cones 16 will be placed over the ends of bars 32 and the threaded portions 32a screwed into the holes 44e. Bar 32 will be provided, as usual, with the member 19 carrying the wedge 23 secured by chain V22 and wedges 23 can be driven through slots 19a and bar 32 to tighten the form and clamp. When the form is taken down bar 32 is screwed out of bar 44, the bars 44 remaining in the concrete. Cones 16 can then be removed as above described.

In Fig. 15 a modification is shown in which a rod 46 is used having threaded ends spaced from the inner sides of the walls 10. The threaded ends of the rod are engaged by the members 14 pivoted as already described to the slotted bars 17. The ends of members 14 and 46 are enclosed by the hollow cone 47 which in this case extends through an opening in the form walls 10 and has an outwardly extending flange 47a at its outer side. Short blocks of wood 48 are disposed at either side of bars 17 and engage the outer side of cone 47. The blocks 48 are substantially the width of the upright 2 x 4s 11 used and abut at their outer sides the whalers 12. Members 19 are as usual placed on bars 17 and have the wedges 23 chained thereto, which wedges pass through the slots in

members

19 and 17 and thus tighten the form. It will be seen that the blocks 48 are necessary to keep the cones 47 from pulling outwardly when the form is tightened. The pipe 15 is used which extends between the inner ends of cones 47.

When the form is tightened the cones 47 will abut the ends of pipe 15. When the form is taken down the members 14 will be unscrewed from rod 46 and the cones 47 can be knocked out as the boards 10l are taken down. 'I'he recesses left in the side of the form may be pointed up as in the other cases described after the cones 47 are removed. In this form a simpler removal of cones 47 is eilected.

In Fig. 16 a modication is shown in which the conical cups or members 16 are omitted. In this construction a rod 50 extends between the walls 10 having threaded ends which terminate at a point spaced from the inner sides of walls 10. A bar 17, such as shown in Fig. 1 is used the same having a member 14 pivoted to its end by a pivot 18, as already described. Bar 17 extends outwardlyand receives the member 19 having secured thereto the wedge 23, member 19 as usual abutting the Whaler 12, which whaler extends transversely of members 1l. The member 14 extends through an opening in wall 10 and as shown, has only its tapered or frusto-conical portion disposed inside of the wall.

In operation rods 50 will be placed between the walls and members 14 screwed thereon at either end.

Members

17 and 19 have slots therethrough as already described and the form will be tightened by driving the wedge 23 until the desired distance is secured between the walls 10. A block or stick (not shown) will be disposed between the walls against which the form will be tightened. Such blocks or sticks are of common use and will be spaced appropriate distances within the form and between the walls 10. When the concrete is poured the said blocks or sticks will be knocked out and when the form is taken down members 14 will be unscrewed from the rod 50. The outer sides of members 14 being smooth and the ends being tapered, this unscrewing movement is easily performed. This can take place as soon as the whalers 12 are removed if desired. The rods 50 will of course remain in the concrete and the holes in the wall at the ends thereof can be pointed up.

In Fig. 17 a modication of the clamp is shown in which a rod 51 similar to rod 13 will be used, said rod extending between the walls 10 and having threadedend portions, the rod terminating at points spaced from the walls 10. A member 52 having a conical inwardly tapering exterior surface is provided, the same being tapped to 'screw over the threaded end of rod 51. The large end of member 52 engages the inner sides of the wall 10 and said member has a bifurcated portion projecting through the wall comprising spaced portions 52a which are traversed by a rivet 53 passing through a bar 54 which is thus pivoted to member 52. Bar 54 extends outward between members 11 and between the portions of Whaler 12 and through the member 19. Said bar and member 19, as already described, having spaced slots therein through which the wedge 23 is adapted to pass relatively to move

members

19 and 54 to tighten the clamp and form.

In operation bars 54 will be passed through the holes in the walls 10 and threaded onto the rod 51'. The distance between the walls 10 can be determined by the position of members 52 on the rod 51. Members 19 will then be placed in position and the wedges driven in place at which time the form will be brought to tightly clamped position with the walls 10 abutting the large ends of members 52. After the concrete is poured and set the wedges 23 can be knocked out` members 19 removed and the members 12 and 11 and the boards of walls 10 then removed. Members 52 will then be unscrewed from rod 51, this operation being done with comparative ease owing to the tapered form of member 52. Rods 51 will remain in the concrete and the openings left by members 52 will b e pointed up.

In Fig. 18 a slightly modified form over that shown in Fig. 17 is shown. It is desirable after the concrete is set to be able to loosen the forms so that they will fall away from the wall. This cannot be done with the structure shownin Fig. 17 owing to the fact that bar 54 is permanently connected to member 52. In Fig. 18 rod 51 is used and a member 55 similar to member 52 is provided having an inwardly tapering conical portion threaded onto the end of rod 51 and having a portion projecting through the wall 10 comprising spaced arms 55a. The arms 55a will have aligned openings extending therethrough adapted to receive a small wedge member or pin 56 chained to bar 5'7. This pin Will pass through an opening in the inner end of bar 57, which extends outwardly through the WhalerA 12 and through member 19.

Members

57 and 19 will have spaced slots extending therethrough as already described and the wedge 23 chained to member 19 is provided adapted to pass through these slots.

In operation members 55 will be threaded onto the ends of rod'5l and the same then placed between the walls 10, arms 55a projecting outwardly. The pins 56 will then be dropped into place connecting the arms 55a to bars 57. Members 19 will then be placed in position and wedges 23 driven to tighten the form. The form will be brought to tightly clamped position 'with the Walls engaging the large ends of members 55. After the concrete has set an operator can go along the form and knock out the pins 56. This 'will permit the walls of the form with members 11 and 12 to fall outwardly and

members

19 and 57 can be removed. The members 55 can then be screwed out of the wall by merely placing bar 57 or some other bar between members 55a and rotating member 55. Members 51 will remain in the wall and the openings left by members 55 will then be pointed up. The openings made through arms 55a will of course be such as to support the wedge 56 in substantially the position shown. A cut nail can be used for this member 56 if desired, or any kind of a headed nail, spike or bolt.

From the above description it is seen that applicant has provided a simple, efcient and quickly operated structure for providing concrete walls with blind ties. The re-enforcing members are quickly placed in position and the form and clamp quickly tightened by means of the wedges. No implements are necessary for tightening the form except an ordinary hammer. The tie can be adjusted to suit various widths of forms or walls. The cones 16 and 47 have smooth outer surfaces and are easily removed from the concrete. The parts left in the concrete are of simple construction and can be inexpensively provided. Several of the forms shown have been amply demonstrated in actual practice, found to be very successful and eicient and the same are being lcommercially made.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts, without departing from the scope of applicants invention, which, generally stated, consists in a device capable of carrying out the objects above set forth, in the novel parts and combinations of parts disclosed and defined in the appended claims.

What is claimed is:-

l. A clamp for a concrete form having spaced walls comprising a member extending between said walls and terminating at the inner sides of said walls, members having a'detachable connection with the ends of said member and extending outwardly therefrom, bars pivoted respectively to said last mentioned members, extending to the outer sides of said form and having spaced slots therethrough, wedge means for moving said bars relatively to said walls to tighten said form, hollow cones 'surrounding the outer ends of said first mentioned members, enclosing said second mentioned members and abutting the inner sides of said walls.

2. The structure set forth in claim 1, and a metal pipe surrounding said first mentioned member extending between and abutting the inner ends of said hollow cones.

3. A clamp for a concrete form having spaced walls including a bar having longitudinally spaced elongated slots therethrough adapted to receive means for moving said bar relatively to said walls, a substantially cylindrical member pivoted to one end of said bar, said member having an interiorly threaded opening in its free end adapted to engage a member extending between said walls. 115

4. The structure set forth in claim 3, said cylindrical member being of slightly larger diameter than the longer transverse dimension of said bar and having its free end tapered for a portion of its length.

5. A member adapted to be used with the tie rod of a concrete form clamp, said member being of frusto-conical form pressed from sheet metal and having an `inwardly extending flange at its small end with an axial opening therethrough and an inwardly extending circumferential ange at its large end with a larger axial opening at its large end.

6. A clamp for a form having spaced walls for forming a concrete Wall having blind ties having in combination, a member extending between said Walls and terminating at the inner sides thereof, means for holding one end of said member relatively to one wall, a member detachably engaging the other end of said member and extending outy 135 wardly therefrom through one of said walls, said last mentioned member having an inner portion and an outer portion pivoted thereto, and means for engaging said last mentioned member and moving the same relatively to said last mentioned wall to tighten said form.

7. The structure set forth in claim 6, said portions being pivoted about a vertical axis disposed outside of the inner side of said last mentioned wall.

8. A clamp for a form having spaced walls for forming a concrete wall having blind ties having in combination, a member extending between said walls and terminating at the inner sides thereof, means for holding one end of said member relatively to one wall, a member detachably engaging the other end of said rst mentioned member and extending outwardly therefrom, a third member pivoted to the end of said last mentioned member and extending to the outer side of one of said walls, means engaging said last mentioned member for moving the same outwardly relatively to said last mentioned wall, a hollow member surrounding the outer end of said lrst mentioned member and said second mentioned member tapering inwardly and having its outer end abutmembers detachably engaging the ends of said member and extending outwardly therefrom, other members connected to said last mentioned members respectively and extending outwardly therefrom to the outer sides of said walls respectively and having swinging movement relatively to said second mentioned members, means engaging said last mentioned members at the outer side of said Walls to move the same and said rst mentioned member relatively to said walls to draw said walls together and tighten said form, hollow members separate from and surrounding the outer ends of the rst mentioned member and the inner ends of said second mentioned members having their outer ends abutting the inner sides of said walls respectively and tapering inwardly therefrom, and a member surrounding and enclosing said rst mentioned member extending between and abutting the inner ends of said hollow members. v

HOWARD O. Meli/BILAN.