US3822860A

US3822860A - Reusable tie assembly for concrete forms

Info

Publication number: US3822860A
Application number: US00232450A
Authority: US
Inventors: P Lovisa; D Tausanovitch
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-03-07
Filing date: 1972-03-07
Publication date: 1974-07-09
Anticipated expiration: 1991-07-09
Also published as: CA966985A

Abstract

A retractable, removable and reusable tie assembly for concrete forms which includes a single tie rod, and an internal spreader and spacing system which includes a sleeve means, the spreader system having built-in provisions for internal spreading and spacing of forms in such a manner as to permit the tie rod to be partially withdrawn on one side of the form facilitating the installation of the closing form, on the opposite side, and then to be inserted to engage and lock with the internal spreader system, thus keeping the two adjacent sides of the forms in a definite predetermined position apart during the concrete pour, then to be removed undamaged from the hardened concrete prior to dismantling of the forms, leaving the internal spreader in the concrete to be removed after stripping of the forms without damaging the internal spreader.

Description

United Statesv Patent [191 Lovisa et a1.

[ REUSABLE TIE ASSEMBLY FOR CONCRETE FORMS 4 211 Appl. No; 232,450

[52] US; Cl 249/217, 249/42, 249/43, 249/190 [51] Int. Cl. E04g 17/06 [58] Field of Search 249/193, 40-47, 249/190-191, 196, 219, 213-217 [56] References Cited UNITED STATES PATENTS 1,907,618 5/1933 Umbach et a1. 249/43 X 2,069,085 l/l937 Day 249/43 X 2,314,866 3/1943 Bosco 249/43 2,709,292 5/1955 Otti 249/43 3,013,323 12/1961 Williams... 249/217 3,174,203 3/1965 Kemper 249/219 W 3,181,832 5/1965 Chianese 249/43 3,437,309 4/1969 Tausanovitch 249/43 X 7 23 Z5IZ6I v e, 29 g 2 39k m "3,822,8 0 ["14 1 July 9,1974

3,465,999 9/1969 Gates. ..249/217x Primary Examiner-Robert D. Baldwin Assistant Examiner-John McQuade Attorney, Agent, or FirmKane, Dalsimer, Kane, Sullivan and Kurucz 1.57] ABSTRACT A retractable, removable and reusable tie assembly for concrete forms which includes a single tie rod, and an internal spreader and spacing system which includes a sleeve means, the spreader system having built-in provisions for internal spreading and spacing of forms in such a manner as to permit the tie rod to be partially withdrawn on one side of the form facilitating the installation of the closing form, on the opposite side,

,of the forms without damaging the internal spreader.

16 Claims, 13 Drawing Figures PATENTED JUL 9 sum 1 0r 4 PATENTED JUL 9 PATENIEDJUL 919M smzgeeo SHEU a 0? REUSABLE TIE ASSELY FOR CONCRETE FORMS BACKGROUND OF THE INVENTION The general purpose of tie assemblies as a tensile unit is to secure forms in place against the lateral pressure of unhardened concrete.

There are three basic types of ties for concrete forms. First, a continuous single tie rod, usually equipped with two weakened break points at certain distance from the concrete faces. The external parts or ends of the ties, after the concrete is hardened, are twisted, broken at the weakened points and removed. The second type of tie is a reusable tapered tie, removed from the concrete wall in the direction of larger rod diameter. The third type of tie is an internal disconnecting tie which consists of a threaded inner part that is lost in the concrete and two removable end bolts which project through the form. In all cases, holes left in the concrete surface are plugged or patched by grout.

The first type of tie, (commonly called snap tie), break back tie, have a smaller cross section, and a weakened section for break back and are feasible only for lighter concrete pressures. They are used with a simple wedge type holding devices, which are hammered in place for easy adjustment of the forms.

The snap ties are a single unit tie with a built-in spreader system washers, or cones, but has disadvantages in closing and stripping operations of the forms. After the first side of the form is erected and reinforcing steel is installed, the snap tie has to be inserted from the inner face of these fonns through the hole in the plywood sheet. In this position snap ties project through the thickness of the future wall and in additon, about 8 inches past the face of the concrete surface. This condition creates time consuming work in matching and pushing ffishing" of ties through the large number of holes on the plywood sheet when it is installed on the opposite side.

Similar difficulties exist instripping of the forms. Usually, a form panel or plywood sheet gets stuck on the projected tie heads and long tie ends, which are nearly impossible to place exactly parallel to each other.

To overcome this, ends of snap ties are usually broken before stripping of forms. This cannot be done after the minimum required curing period of the concrete has elapsed since the ties cannot be twisted and broken because they will rotate in the still insufficiently hardened or green" concrete. Forms have to remain in place for a longer period and the reusability of the forms is decreased. Finishing can not take place while concrete is still green or relatively soft.

The second type of tie, a tapered tie, requires a coating before each reuse, needs to be hammered or roand the use of tools to secure them to the form which is time consuming and adds to the labor costs.

Conditions for closing and stripping of forms are much better than with a break back tie, but still represent a two man job to match and thread end bolts with intermediate threaded connection, especially for bolts out of reach, located in the middle part of large form panels.

A reusable concrete form tie is disclosed in U.S. Pat. No. 3,437,309. The tie assembly disclosed is provided with .a yieldable tube with a tie rod slidably disposed therein, the tube being employed as the sleeve means between the forms. After the forms have been removed the entire assembly, including the tie rod, is removed from the concrete wall.

SUMMARY OF THE INVENTION The present invention, combines the benefits of snap ties as a single tie rod unit, but without being restricted to a small cross-section and with the benefits of removable end bolts of the coil type tie, thereby providing greatly reduced labor costs in the forming operation,

freely retractable, easily installed and entirely withdrawn with forms in place. The removable tie rod with a remotely engaged internal spreader assembly represents an entirely new and unique type of tie, thus offering an improved technique in forming operations.

The invention herein generally contemplates the provision of a reusable tie assembly for concrete forms capable of being disassembled after use and which is readily removed from the concrete wall or structure without damage to any portion of the tie assembly. The tie assembly includes an internal spreader means adapted to be positioned between concrete forms and to provide internal spreading and spacing means as well as a passage for receiving a tie rod. The tie rod is removably mounted in the passage of the sleeve means and is provided with means defining surfaces engageable with the rod and internal spreader means so that the rod and internal spreader means are disengageable from each other after the concrete has been poured. The tie rod is removable therefrom while the forms remain in an erected position thereby permitting the stripping of the forms from the concrete without the necessity of severing tie rods or holding the forms in a position for removal from ends of tie rods embedded in the concrete and with the subsequent removal of the internal spreader means without damage. The invention also contemplates the provision of a novel wedge for removably mounting to the forms and adapted to releasably couple to the ends of the tie rod regardless of the plane of the tie rod passing through the concrete forms.

It is therefore an object of the present invention to provide an improved type of tie assembly which will facilitate the erection and stripping of concrete forms; which readily reduces the labor costs attendant thereto, and which can be disassembled prior to the stripping operation after the concrete structure has been formed. Another object of the invention is to provide a tie assembly which can be easily and quickly installed having a variety of uses including gang forming.

Another object of the invention is to provide a tie assembly which is relatively inexpensive tomanufacture, economical to use, readily assembled and disassembled prior to and subsequent to use, with all parts being reusable. Another object of the invention is to provide wedges which are employed to anchor or rigidly mount the tie rod to the form to prevent lateral movement of the tie rod assembly after erection of the forms and which can be readily removed from the form and easily disengaged from the tierod.

DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded view which illustrates one form of a tie assembly of the invention herein.

FIG. 2 is an elevational sectional view of the tie assembly ready for use.

FIG. 3 is a side elevational view of a washer means for releasably mounting the elastomeric sleeve means to the tie rod of the assembly shown in FIGS. 1 and 2.

FIG. 4 is a plan view of the washer means illustrated in FIG. 3.

FIG. 5 is an exploded view of another form of the tie assembly of the invention herein.

FIG. 6 is an elevational sectional view of thetie assembly ready for use.

FIGS. 7, 8 and 9 illustrate the steps for erecting and stripping concrete forms employing the tie assembly of the invention herein.

FIG. 10 is a perspective view of the novel wedge assembly for removably mounting to the ends of the tie rod of FIGS. 1 and 3.

FIG. 11 illustrates the wedge of FIG. 10 mounted to an end of the tie rod of FIG. 1.

FIG. 12 illustrates the wedge of FIG. 10 mounted to the sleeve end of the tie rod of FIG. 5.

FIG. 13 is a perspective view of the tie rod coupling means before being mounted to the wedge of FIG. 10.

DESCRIPTION OF THE PREFERRED EMBODIMENT For a better understanding of the invention herein reference is had to the drawings and particularly to the embodiment of FIGS. 1 through 4.

Tie assembly 10 includes tie rod 12 and internal spreader means 20. Internal spreader means 20 comprises a yieldable elastomeric tubular sleeve 21 having mounted at one end 24 a frustro conical cone 22. A passage extending through cone 22 is formed so as to be in axial alignment with the passage of tubular sleeve 21. Cone 22 is generally formed of hard rubber such as neoprene.

Cone 22 has a lower base 26 and an upper base 28 with an annular recess 30 formed therein and having a diameter substantially equal to the outside diameter of sleeve 21. The annular recess 30 facilitates mounting cone 22 on end 24 by providing contact surfaces within the annular recess for receiving a suitable adhesive so that end 24 is bonded thereto.

Cone 22 has embedded therein adjacent base 26 slotted washer 36. Slotted washer 36 is formed of a rigid material such as steel and forms part of the locking mechanism for removably mountinginternal spreader means 20 on rod 12. Slotted washer 36 may be formed by a stamping procedure wherein

slots

38 and 39 are formed diametrically opposite to each other. The portion of the slot which is stamped from washer 36

forms depending projections

40 and 41. Also, formed around the outer edge of base 26 is annular rim 29 which serves as a seal to prevent leakage of concrete through the holes in the forms F.

A removable cone 23 is formed of a hard rubber material such as neoprene and is made having the same configuration as cone 22. A-second steel washer 27 is embedded in the base 27 of cone 23 and may be slotted as-illustrated in FIG. 4 but is preferably provided without slots. Also, a similar sealing rim 29 as formed on base 26 is provided on base 27. Formed on the lateral surface of

cones

22 and 23 and adjacent their respective

upper bases

28 and 28 are raised

projections

22 and 23 so as to provide stop means to prevent rotation thereof when retracting or removing the tie rod 12.

Tie rod 12 is made of a material having high tensile and shearing properties such as suitable types of steel. Small projections 14 are formed on rod 12 and are positioned diametrically opposite to each other. Projections 14 may be made by simply pressing the steel rod so as to die cut the rod to form a raised projection on each side thereof. Similarly formed projections 15 are spaced from projections 14 a distance from each other substantially equal to the length of sleeve means 20. When mounting internal spreader means 20 on rod 12 one end of the rod is passed through cone 22 and tubular sleeve 21. Cone 22 is then rotated to permit cone 22 to pass beyond raised projections 14. Then, by simply rotating cone 22 less than 180 internal spreader means 20 will be in locked position on rod 12 Then cone 23 is passed over the end of rod 12 adjacent projections 14 so that cone 23 will be mounted in position as illustrated in FIG. 2.

Formed adjacent each end of rod 12 is a pair of

parallel notches

18 and 19. These notches form part of the locking assembly for removably mounting the tie rod assembly in fixed position to the forms.

Parallel notches

18 and 19 in the embodiment illustrated in FIG. 1 are mounted in a steel holding device such as illustrated in FIG. 11. Such a steel holding device or wedge is easily mounted to a form as illustrated in FIGS. 7 and 8.

Wedge 42 is generally rectangular in shape and is made of a malleable steel. A raised body portion in the form of an incline plane 43 having a longitudinally extending slot 44 is formed therein. At the base of slot 44 an opening 45 is provided for receiving

rod

12 or 62 and also to provide an access opening for mounting tie rod coupling means 50 in slot 44. Tie rod coupling means 50 is held in fixed slot 44 by a suitable stop means 52. Thus, tie rod anchoring means 50 is slidable along slot 44 from the junction of the opening 45 to the opposite end of slot 43. The notch 46 provided in tie rod anchoring means 50 has a dimension substantially equal to the mass 17 of rod 12 defining the base surfaces of

parallel notches

18 and 19.

The wall 71 defining the

parallel notches

18 and 19 and which are formed adjacent each end of the tie rod are arcuately formed. Tie rod coupling means 50 on its upper surface has an arcuate recess 56 formed normal to notch 46. The arcuate recess 56 permits the arcuate wall 71 of the respective

parallel notches

18, 19, 65 and to contact tie rod coupling means at any angle with respect to the tie rod passing through the concrete forms F illustrated in FIGS. 7 through 9. Also, formed in tie rod coupling means 50 is a recess 57 having dimensions substantially equal to the outside dimensions of camming head 64 of tie rod 62. Formed at the outer lips 48 of notch 46 are camming surfaces so that when wedge 42 is mounted on the form as seen in FIG. 11 tie rod coupling means 50 will automatically slip over camrning head 64 to releasably lock tie rod 62 in fixed position. i

Wedge 42 has increased strength due to the construction of tie rod coupling means 50. When

tie rod

12 or 62 is mounted in fixed position on the forms as illustrated in FIGS. 7 and 8 the forces exerted by the concrete against tie rod 112 or 62 would tend to shear the ends of the tie rod or tend to deform wedge 42 so that it would fail. However, by providing the tie rod 62 with arcuate wall surfaces 71 the forces exerted on the tie rod are transmitted over the entire mass of tie rod coupling means 50 as illustrated most clearly in FIGS. 11 and 12. It is possible therefore to increase the'load of the wedge by providing the structure of tie rod coupling means 50.

FIG. 5 and 6 illustrate another embodiment of a reusable tie assembly 60 for concrete forms capable of being disassembled after use in accordance with the invention herein. Tie assembly 60 comprises tie rod 62 having a flanged head portion 64 formed at end 63 and at the other end 61 is a pair of parallel slots 65. A tubular metal member 68 having a pair of parallel slots 70 is formed at end 69 and at the other end a threaded portion 72 is formed and is adapted to threadably mount internal spreader means 80 thereto. Tubular member 68 is slidably mounted on tie rod 62 so that parallel slots 70 are positioned adjacent the flanged head portion 64. Tubular member 68 is permanently retained on tie rod 62 by forming diametrically opposed projections 66 after tubular member 68 has been slidably mounted on rod 62. Projections 63 are formed similar to

projections

14 and 15 of rod 12 as described in FIG. 1. A similar pair of projections 66 are formed and spaced a distance fromthreaded end 72 of pipe '68 such that when internal spreader means 80 is mounted thereon, as illustrated in FIG. 6, a desired distance for maintaining forms is obtained as illustrated most clearly in FIGS. 7 through 9. Internal spreader means 80 has mounted at one end a frustro conical cone 82 similar in design and formed of similar material to frustro

conical cones

22 and 23 of FIG. 1. Embedded in base 81 of cone 82 is threaded nut 83 adapted to receive in threaded engagement threaded end 72 of tubular member 68. At the other end of internal spreader means 80 is a removable frustro conical cone 84 similar in configuration to frustro

conical cones

22 and 23 of FIG. 1. Embedded in the base of cone 84 is washer 37' similar to the washer 36 of FIGS. 3 and 4 but preferably without slots. Internal sleeve means 88 includes sleeve 86 and forms a passage for tie rod 62. Sleeve 86 is made of an elastic material such as natural or synthetic rubber.

Illustrated in FIG. 8, tie assembly 60 is mounted in position to forms F. Also illustrated mounted in position on tie rod 62 is steel wedge 42. Tie rod coupling means 50 is illustrated having the surfaces defining parallel slots 65 mounted therein while at the other end the surfaces defining parallel slots 70 of tubular member 68 are mounted to slot 44 of wedge 42 as illustrated in FIGS. 11 and 12. Tie rod coupling means 58 is provided with a recess 57 which is of a size to receive a portion of camminghead 64 of rod 62. The surfaces defining parallel slots 70 slidably engage the surfaces defining longitudinally extending slot 44. Thus, when tie assembly 60 is mounted in position, as shown in FIGS. 8, 11 and 12, tie rod 62 is incapable of lateral move ment since the

parallel slots

65 and 70 are locked in wedge 42 thereby maintaining forms F a predetermined distance defined by the length of internal spreader means 88. Also, by employing the wedge 42, tie assembly does not necessarily require mounting through forms F in a position normal to forms F but may be skew thereto. This is possible since the surfaces defining parallel slots and are formed having'arcuate walls 71' and 72. Similar arcuate walls are formed in

parallel slots

18 and 19 of rod 12. Further, by providing arcuate walls in the parallel slots of the embodiments of FIGS. 1 and 3 and the arcuate recess 56 of tie rod coupling means 50 it is possible to maintain the lateral pressures created by concrete being poured into the space between the forms and to increase the rated load of the wedge without the necessity of increasing the mass of the wedge or tie rod.

Inpractice, the process for erecting and stripping forms is illustrated in FIGS. 7 through 9. As indicated above, the tie'assembly depicted in FIGS. 7 through 9 illustrates the assembly of FIG. 3. Thus, in describing the erection and stripping of forms F illustrated in FIGS. 7 through 9 the tie assembly of FIG. 3 will be described. Tie assembly 60 is disassembled by unthreading tubular member 68 from internal spreader means and is removed from tie rod 62. Tie rod 62 is passed through an opening in form F, then internal spreader means 80 is slidably mounted on tie rod62 so-that only a short distance of tie rod 62 extends beyond removable cone 84 of internal spreader means 80. Then, after all of the tie rods that are to be employed for form F are similarly mounted therein the closing form is mounted by manipulating tie rod 62 into corresponding openings of the second form. Tie rod 62 is then mounted inposition by the assembly of steel wedge 40 the parallel members of wallers as illustrated in FIG. 8 and as shown in enlarged elevational view of FIGS. 11 and 12. Tie rod 62 is locked in position by mounting the ends of the tie rod as described for FIGS. 11 and 12. Wedge 42 is held in position simply by a wedging action or, for example, by using a nail through the openings 49 provided in wedge 42 as shown in FIG. 10.

After the concrete has been poured, the nails are removed from wedge 42 and the ends of the tie rod 62 are unlocked by simply removing the steel wedge from the forms. Tie rod 62 is released from tie rod coupling means 58 and is retracted to the point where projections 66 of tie rod 62 contact the end of tubular member 68. When tie rod 62 .is removed to the point where projection 66 are contacted by tubular member 69, tubular member 68 is unthreaded from the threaded nut 43 embedded in cone 82. Then tie rod 62 together with tubular member 68 is removed. Tie rod 62 is shown removed in FIG. 9 so that only internal spreader means 80 remains embedded in the concrete. Forms F are then stripped from the concrete in the usual

fashion exposing cones

82 and 84. Also

projections

82 and 84 formed on

cones

82 and 84 prevent rotation of the cones when removing tie rod 62 as described above.

Cone 82 is grasped and by simply stretching elastomeric sleeve 86 the bond holding the elastomeric sleeve in the concrete is broken and is then easily removed therefrom. Then by simply grasping cone 84 embedded on the other side of the concrete it is removed and reassembled as explained above. The passage made by elastomeric sleeve means is plugged in the usual fashion. I

It is obvious from the foregoing that a reusable tie assembly has been disclosed and it is easily and quickly disassembled for removal from the concrete after a forming operation and can be reassembled for subsequent reuse. Also, the reusable tie assembly of the invention herein can be mounted in position even though the tie rod is not exactly normal to the surface of the form and the wedge means employed permits mounting the tie rod in fixed position even though it is skewed to the surface of the form.

I claim:

l. A retractable reusable tie assembly for concrete forms capable of being disassembled after use comprismg:

a spreader means adapted to be coupled with concrete forms to maintain the forms a predetermined distance apart and providing a passage therethrough;

an elongatable, elastomeric sleeve cooperating in defining the passage;

a tie rod removably mounted in the passage of the- I spreader means; interengageable surfaces defined by the spreader means and the rod and arranged and constructed for releasably coupling said spreader means to said tie rod so that the tie rod and spreader means are disengageable from each other while the forms are still in place and the tie assembly can be disassembled after use and removed from'the concrete without damage to the concrete and tie assembly.

2. A retractable reusable tie assembly for concrete forms capable of being disassembled after use comprismg:

an internal spreader means adapted to be positioned between concrete forms to maintain the forms a predetermined distance apart and providing a passage therethrough;

a tie rod removably mounted in the passage provided by the spreader means;

said internal spreader means including an elongatable, elastomeric sleeve having a frustro conical cone mounted at one end thereof, said cone having an annular metal ring embedded therein and providing surfaces formed therein adapted to engage and disengage therod from said spreader means; said annular metal ring defining surfaces engageable with the rod and spreader means so that the tie rod and spreader means are disengageable from each other while the forms are still in place whereby the tie assembly can be disassembled after use and removed from the concrete without damage to the concrete and tie assembly.

3. The retractable reusable tie assembly of claim 2 wherein the cone is formed having a plurality of spaced projections formed radially about the lateral surface thereof so as to provide stop means to prevent rotation thereof when retracting or removing the tie rod.

4. The retractable reusable tie assembly of claim 2 end, said cone having an annular metal ring embedded therein.

7. The retractable reusable tie assembly of claim .6 wherein the cone is formed having a plurality of spaced projections formed radially about the lateral surface thereof so as to provide stop means to prevent rotation thereof when retracting or removing the tie rod.

8. The retractable reusable tie assembly of claim 1 wherein the tie rod includes projections formed on the surface thereof and spaced a predetermined distance apart and adapted to engage surfaces of the spreader means.

9. The retractable reusable tie assembly of claim 1 wherein a pair of parallel slots are formed adjacent each end 'of said tie rod; said slot having an arcuately formed wall adjacent the end of the tie rod and capable of coupling to mounting means positioned on concrete forms for releasably mounting the tie rod in fixed position.

10. The retractable reusable tie assembly of claim 1 wherein the tie rod includes an elongated tubular member slidably mounted thereon and having means at one end thereof for releasably coupling to the spreader means, said tie rod having stop means formed at one end thereof to prevent said tubular member from shifting beyond the end of the tie rod and said elongated tubular member being provided with a pair of parallel slots formed at one end thereof and adjacent the tie rod stop means.

11. The retractable reusable tie assembly of claim 10 wherein the walls defining each parallel slot, the wall adjacent the end of the rod is formed arcuately.

12. The retractable reusable tie assembly of claim 10 wherein the coupling means formed at one end of the tubular member is provided with threads.

13. A retractable reusable tie assembly for concrete forms capable of being disassembled after use comprismg:

a tie rod removably mounted in the passage of the spreader means;

said tie rod and spreader means having interengageable surfaces for releasably coupling the tie rod and spreader means so that these parts are readily disassembled to remove the assembly from the concrete without damage to the concrete and tie assembly;

the tie rod having coupling means disposed adjacent each end thereof for releasably mounting the tie rod in fixed position on the cement forms, and a wedge mounted on said form and having tie rod coupling means for receiving the ends of the tie rod;

the wedge comprising a generally rectangular body portion and a central portion thereof being raised to form an incline plane;

the incline plane having a slot extending longitudinally thereof; and

tie rod coupling means slidably disposed in said slot for rigidly and releasably coupling the tie rod in fixed position whereby the tie assembly can be disassembled after use and removed from the concrete without damage; to the concrete or tie assembly.

14. A retractable, reusable tie assembly for concrete forms capable 'of being disassembled after use comprising: I

a spreader means adapted to be mounted on concrete forms to maintain the forms a predetermined distance apart and providing a passage therethrough;

said spreader means including an elongatable elastomeric sleeve of essentially uniform diameter throughout so as to facilitate assembly and disassembly of the tie rod from the spreader means when mounted on the concrete forms;

a tie rod removably mounted in the passage of the spreader means;

said tie rod and spreader means having interengageable surfaces for releasably coupling the tie rod and spreader means so that these parts are readily disassembled to remove the assembly from the con- UNITED STATES PATENT OFFICE YE A E OF co-EtTIoN Patent No. 3 822 860 v Dated July 97 fInventor(s) w Peter R. Lovisa, Dusan Tausanovitch It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as vshown below:

Column 1,, line 36 "additon" should be --addition--=;

Column 3, line 27 "3" should be --5--;

Column 3, line 29 "1" should be ---5;

Column 3, line 31 "sleeve" should be --other--;

Column 4, line 3 "27" should be ---37-- Column 4, line 37 Fig 11" should be Fi 12--;

I Column 4, line 53 delete "71";

Column 4, line 58 delete "71";

Colunm 5, line 31 "63 should be --66--;

Column 5, line 33 "66" should be --67----:

Column 6, line 11 "3" should be --5--;

Column 6, line 20 "3" should be --5--;

Column 6, line 22 "3 should be 5--;

Column 6, line 25 "and" should be -which- FORM O-1050 (10-69) uscoMM-Dc 60376-P69 I U-5 GbVERNMENT PRINTING OFFCE I 1959 0-365334 UNITED STATES PATENT OFFICE- CERTIFICATE OF CORRECTION Patent No. H 3,822,860 I Dated July 9, 1974 i '-'-1nventor( g? Peter R. Lovisa and Dusan Tausanovitch Page 2 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 6, line35 "40" should be --42--;

Column 6, line 50 "69" should be --68--; Column 6, line 52 "43" should be --83--; and

Column 7, line 60 after "stop" insert --means Signed stud sealed this 18th day of February 1975.

(SEAL) Attest:

, C. MARSHALL DANN RUTH C. MASON Commissioner of Patents Attesting Officer and Trademarks FORM Po-wso (10-69) USCOMWDC 3764,69 U.$. GOVERNMENT PRINTING OFFICE I959 0-365-334

Claims

1. A retractable reusable tie assembly for concrete forms capable of being disassembled after use comprising: a spreader means adapted to be coupled with concrete forms to maintain the forms a predetermined distance apart and providing a passage therethrough; an elongatable, elastomeric sleeve cooperating in defining the passage; a tie rod removably mounted in the passage of the spreader means; interengageable surfaces defined by the spreader means and the rod and arranged and constructed for releasably coupling said spreader means to said tie rod so that the tie rod and spreader means are disengageable from each other while the forms are still in place and the tie assembly can be disassembled after use and removed from the concrete without damage to the concrete and tie assembly.

2. A retractable reusable tie assembly for concrete forms capable of being disassembled after use comprising: an internal spreader means adapted to be positioned between concrete forms to maintain the forms a predetermined distance apart and providing a passage therethrough; a tie rod removably mounted in the passage provided by the spreader means; said internal spreader means including an elongatable, elastomeric sleeve having a frustro conical cone mounted at one end thereof, said cone having an annular metal ring embedded therein and providing surfaces formed therein adapted to engage and disengage the rod from said spreader means; said annular metal ring defining surfaces engageable with thE rod and spreader means so that the tie rod and spreader means are disengageable from each other while the forms are still in place whereby the tie assembly can be disassembled after use and removed from the concrete without damage to the concrete and tie assembly.

4. The retractable reusable tie assembly of claim 2 wherein the annular metal ring is formed having diametrically opposed slots and stop depending from the base of the slot and normal to the annular ring.

5. The retractable reusable tie assembly of claim 2 wherein the surfaces formed on the annular metal ring are threaded.

6. The retractable reusable tie assembly of claim 2 wherein the elongated elastomeric sleeve includes a frustro conical cone removably mounted at said other end, said cone having an annular metal ring embedded therein.

7. The retractable reusable tie assembly of claim 6 wherein the cone is formed having a plurality of spaced projections formed radially about the lateral surface thereof so as to provide stop means to prevent rotation thereof when retracting or removing the tie rod.

9. The retractable reusable tie assembly of claim 1 wherein a pair of parallel slots are formed adjacent each end of said tie rod; said slot having an arcuately formed wall adjacent the end of the tie rod and capable of coupling to mounting means positioned on concrete forms for releasably mounting the tie rod in fixed position.

13. A retractable reusable tie assembly for concrete forms capable of being disassembled after use comprising: a spreader means adapted to be coupled with concrete forms to maintain the forms a predetermined distance apart and providing a passage therethrough; a tie rod removably mounted in the passage of the spreader means; said tie rod and spreader means having interengageable surfaces for releasably coupling the tie rod and spreader means so that these parts are readily disassembled to remove the assembly from the concrete without damage to the concrete and tie assembly; the tie rod having coupling means disposed adjacent each end thereof for releasably mounting the tie rod in fixed position on the cement forms, and a wedge mounted on said form and having tie rod coupling means for receiving the ends of the tie rod; the wedge comprising a generally rectangular body portion and a central portion thereof being raised to form an incline plane; the incline plane having a slot extending longitudinally thereof; and tie rod coupling means slidably disposed in said slot for rigidly and releasably coupling the tie rod in fixed position whereby the tie assembly can be disassembled after use and removed from the concrete without damage to the concrete or tie assembly.

14. A retractable, reusable tie assembly for concrete forms capable of being disassembled after use comprising: a spreader means adapted to be mounted on concrete forms to maintain the forms a predetermined distance apart and providing a passage therethrough; said spreader means including an elongatable elastomeric sleeve of essentially uniform diameter throughout so as to facilitate assembly and disassembly of the tie rod from the spreader means when mounted on the concrete forms; a tie rod removably mounted in the passage of the spreader means; said tie rod and spreader means having interengageable surfaces for releasably coupling the tie rod and spreader means so that these parts are readily disassembled to remove the assembly from the concrete without damage to the concrete and tie assembly.

15. The retractable, reusable tie assembly of claim 14 wherein said interengageable surfaces include a projection formed on the tie rod and a complementary recess which when oriented in a first position, said tie rod and said spreader means remain coupled and when oriented in a second position said tie rod and said spreader means are uncoupled.

16. The retractable, reusable tie assembly of claim 15 wherein said projection and recess forms a key and keyway.