US2548214A

US2548214A - Dowel attachment and adjusting lock for forms

Info

Publication number: US2548214A
Application number: US76213A
Authority: US
Inventors: Robert E Heltzel
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-02-14
Filing date: 1949-02-14
Publication date: 1951-04-10
Anticipated expiration: 1968-04-10

Description

April 10, 1951 R. E. HELTZEL DOWEL ATTACHMENT AND ADJUSTING LOCK FOR FORMS Filed Feb. 14, 1949 INVENTOR. Zlj e'l q 7/4 6%rnqy5' Patented Apr. 10, 1951 DGWEL ATTACHMENT AND ADJUSTING LOCK FOR FORMS Robert E. Heltzel, Warren, Ohio Application February 14, 1949, Serial No. 76,213

The present invention relates to improvements in Dowel Attachment and Adjusting Lock for Forms and more particularly relates to an attachment for use in connection with standard forms used in connection with pouring concrete slabs for road and other constructions in which provision is made for supporting the dowel bar from the form with an end portion of the dowel bar held projecting in position to be embedded in the slab being formed.

An object of the invention is to provide an attachment oi the kind above indicated which will dispense with the use of the so-called split form which was expensive in construction and diificult and tedious oimanagement in use.

A further object of the invention is to provide an improved attachment which will enable the forms to be stripped without any danger of the forms binding on the dowel bars.

Another object of the invention is to provide an improved locking device for locking the dowel bars and at the same time enabling the form setter to regulate the dowel at any desired angle position with respect to the plane of the form.

A still further object of the invention is to pro- 13 Claims. (Cl. 287-20) vide an improved locking device which will perniit quick attachment to the fOI'll'l prior to pouring and quick detachment when the forms are ready for stripping.

With the foregoing and other objetcs in View,

the invention will be more fully described hereinafter and more particularly pointed out in the appended claims.

In the drawings, in which like parts are denoted by the same reference characters throughout the several views,

Figure 1 is a fragmentary perspective view of road forms and a dowel position standard form showing a device applied thereto according to the present invention;

Figure 2 is a similar view with a portion oi the device removed preparatory to breaking the'dowel bar form away from the concrete;

Figure 3 is a vertical section taken through the slab showing the standard dowel positioning form broken away from the concrete;

Figure 4 is an end elevational view of the improved device with the standard form indicated in dotted lines; and

Figure 5 is a longitudinal section taken on the line 55 in Figure 4.

Referring more particularly to thedrawings, Iii designates a standard form it having a usual web H in which, according to the invention, an Opening 12 is made for each dowel. This opening may be circular or of any other form, the same being substantially larger in diameter than the outside diameter of the dowel bar or the outside contour of the dowel bar of any other shape.

In this opening i2 is removably fitted a shouldered disc is having a shoulder 54 of approximately the same diameter or external size as the opening E2 in the form and adapted to fit with-a rather close tolerance therein. The disc i=3 has a flange l5 outstanding from the shoulder M and offset therefrom, such flange i5 being of greater diameter or external size than that of the opening I2 to fit against the web A l for preventing the disc from being pulled through such opening 2.

The shouldered disc 13 on the shouldered side thereof and on the side away from the flange i5 is provided with two or more headed pins t8 adapted to mate with a corresponding number of key slots i9 formed in a sleeve flange 2% which projects outwardl from one end of, a'sleeve 2|.

The internal diameter of the sleeve 2! is substantially in excess of the outside diameter of the dowel il or where the dowel is other than circular in form the sleeve will be larger than the external configuration of such dowel.

The sleeve 25 carries a number of radially arranged dowel adjusting and lock screws 22 threaded through the Wall of the sleeve prefer ably adjacent the end of the sleeve opposite the sleeve flange 26. These adjusting screws may have cranks or heads 23 to facilitate rotating the screws into and out of binding and locking engagement on the dowel ll.

In the use of the device, the standard form it is set up on the subgrade and staked in place in a manner well known in the art. The disc [3 isv thereupon fitted to the opening l2 in such wise that the disc flange l5 fits against the side of the web H which is about to receive the poured concrete. The sleeve2l is fitted to the opposite side of the form web H in such relationship to the headed pins 18 that the key slots [9 at their larger portions are fitted over the heads of the pins. On partial rotation the narrower portions of the key slots l9 are brought under the heads of the pins l8 so that the disc and the sleeve are mutually locked in place on the form ill. The dowel ll is thereupon slid through the disc opening it, such opening 16 being of such size as to fit the dowel with small tolerance. The dowel is also passed into or partially through the sleeve 2| and the screws 22 are thereupon tightened upon the dowel. These screws support the dowel concentrically-at one point while the dowel also receives support in the wall of the disc opening I6 at a remote point. This duplex support maintains the dowel in correct position. Due to the relative thinness of the disc I3 the dowel may have a limited movement therein at approximately right angles to its axis so that by adjustment of the screws 22 the axis of the dowel may be brought into a desired relationship with the plane of the form web II or the subgrade. Consequently, if and when the form assumes a canted position with reference to the subgrade, by manipulation of the adjusting screws 22 the dowel may still be brought to a correct parallel position with respect to the subgrade.

It will of course be understoodthat one end portion of the dowel will project on the flange side of the disc I3 to a desired length to be embedded in the slab currently being poured and molded. After the concrete has sufficiently set and it is desired to strip the form, this may readily be done by initially backing ofi the screws 22 from the dowel and thereupon rotating the sleeve 2| and its flange 28 to free the same from the headed pins I8 of the disc I3. The sleeve and its disc are then removed from the dowel by longitudinal or axial sliding movement. The form web I I is then broken loose from the shoulder I4 of the disc I3. Thereafter it becomes an easy matter to strip the form Hi from the dowels I'I irrespective of any cocked positions of the dowels with respect to the openings I2 of the form because of the differential size of the openings I2 over the external dimension of the dowels II. In other words the large openings I2 in the form provide ample clearance for moving over the dowels and do not require that the dowels extend in an exactly right angular position with re spect to the form web I I. This greatly facilitates the stripping of the form from the set dowels.

After the form is removed the discs I3 are easily slipped off the set dowels I1.

I desire it to be understood that the headed pins I8 and the key slots IE} show only one form of an interlocking arrangement between the disc l3 and the sleeve flange 2t, and it is obvious that other forms of interlocking arrangements may be employed without departing from the invention.

The attachment according to the invention will be seen to have a threefold purpose; first, it holds and supports the dowel bars in a rigid position for the pouring operation; second, it provides a method for adjusting the position of the dowel bar with respect to the subgrade or the form web or face of the form; and third, by its nature permits easy stripping of the forms from around the dowel bars without any danger of binding the forms on the dowel bars.

While I have disclosed herein the best form of the invention known to me at the present time, I desire it to be understood that I reserve the right to make changes and modifications in the herein described embodiment of the invention provided such changes fall within the scope of the following claims.

What I claim is:

1. For use with a dowel bar and a standard form having an opening therethrough of a size in excess of the outside dimensions of the dowel bar, an attachment comprising a pair of complemental members adapted to be fitted to opposite sides of the standard form, one of said members having a part for fitting through the opening in the form, interlocking means for temporarily securing the members together, one of the members having an opening therethrougli adapted to receive the dowel with small tolerance,

and adjusting means on the other member for binding upon the dowel at a zone spaced from the opening in the companion member.

2. An attachment as claimed in claim 1 characterized by the fact that the member having the opening with small tolerance with respect to the dowel is narrow in an axial sense to permit the dowel to rock therein under the influence of said adjusting means.

3. An attachment as claimed in claim 1 wherein said other member constitutes a sleeve having an internal diameter greatly in excess of the external dimensions of the dowel and wherein said adjusting means is carried in said sleeve.

4. An attachment as claimed in claim 1 characterized by the fact that said adjusting means is a plurality of screws threadedly engaged through said other member and extending radially of said other member and of the dowel.

5. An attachment as claimed in claim 1 characterized by the fact that one of the members is a flanged disc having a shoulder adapted to fit the opening in the form with small tolerance and having a flange offset and outstanding from the shoulder and being of greater diameter than the opening in the form for engaging against the web of the form at one side.

6'. An attachment as claimed in claim 1 characterized by the fact that one of the members oomprises a sleeve which carries the adjusting means and has an outstanding flange adapted to fit against the first named member, the flange being of greater diameter than that of the opening in the form.

7 An attachment as claimed in claim 1 characterized by the fact that the interlocking means comprises headed pins on one of the members detachably fitting into keyhole slots of the other member.

8. For use with a standard form and dowel bars fitting through openings in the web of the standard form, such openings being of substantially greater dimensions than the external dimensions of the respective dowel bars, attachments comprising fianged discs having openings therein to slidably receive the dowel bars and shoulders to fit with small tolerance in the openings of the form and also having flanges ofiset and outstanding from the shoulders to take against the side of the form against which the concrete is poured, sleeves adapted to be fitted to the opposite side of the form and having flanges to fit against the exposed faces of the discs and also suficiently wide to engage the adjacent side of the form beyond the form openings, said sleeve having a greater internal diameter than the opening in the disc, and adjusting means at the outer portion of the sleeves adapted to engage the dowel bars.

9. An attachment as claimed in claim 8 in which the adjusting means is constituted by a number of radially arranged screws threaded through the sleeve and having heads for convenience in rotating the same.

10. An attachment as claimed in claim 8 in which interlocking means is provided between the discs and the respective sleeve flanges.

11. For use with a standard form and dowel bars fitting through openings in the web of the standard form, such openings being of substantially greater dimensions than the external dimensions of the respective dowel bars, attachments comprising flanged discs having openings therein to slidably receive the dowel bars and shoulders to fit with small tolerance in the openings of the form and also having flanges offset and outstanding from the shoulders to take against the side of the form against which the concrete is poured, sleeves adapted to be fitted to the opposite side of the form and having flanges to fit against the exposed faces of the discs and also sufficiently wide to engage the adjacent side of the form beyond the form openings, said sleeve having a greater internal diameter than the opening in the disc, adjusting means comprising a number of radially arranged screws threaded through the sleeve and having heads for convenience in rotating the same, interlocking means provided between said discs and the respective sleeve flanges comprising headed pins outstanding from the discs with keyhole slots in the sleeve flanges with the wider portions of the slots adapted to fit over the heads of the pins and on relative rotary motion the pin heads adapted to be brought opposite the narrower portions of the slots which are narrower in width than the diameters of said heads.

12. In a device of the kind described a form having openings therein, dowels having outside dimensions substantially smaller than the diameters of the openings and adapted to be loosely fitted therethrough, flanged discs fitted snugly and removably in the openings and having openings to fit with small tolerance over the dowels, flanged sleeves also adapted to slidably fit over the dowels with an opening greatly in excess of the external dimensions of the dowels with the flanges fitting against the exposed portions of the discs, interlocking means between the sleeve flanges and the discs, and adjusting means on the outer portions of the sleeves for engaging the dowel bars.

13. A device as claimed in claim 12 characterized by the fact that the adjusting means is formed by a plurality of screws threaded through threaded openings made in the outer portion of the sleeves.

ROBERT E. HELTZEL.

REFERENCES CITED UNITED STATES PATENTS Number Name Date 140,656 Smith July 8, 1873 Barnicoat Dec. 12, 1939