US2281946A

US2281946A - Screed support

Info

Publication number: US2281946A
Application number: US258529A
Authority: US
Inventors: Jr Lambert J O'neill
Original assignee: POIRIER AND MCLANE CORP
Current assignee: POIRIER AND MCLANE CORP
Priority date: 1939-02-25
Filing date: 1939-02-25
Publication date: 1942-05-05
Anticipated expiration: 1959-05-05

Description

Patente-d May 5, 1942 UNITED STTES A@TENT OFFICE.

SCREED SUPPORT Application February 25, 1939, Serial No. 258,529

(Cl. 'l2-128) 4 Claims.

This invention relates to a support for a leveling device such as a screed or the like.

One of the objects of this invention is to provide a screed support which is simple and inexpensive in construction, yet sufficiently sturdy to rigidly support a screed. Another object is to provide a device of the above nature which may be secured in proper position and which is adjustable so as to vary at Will the elevation of the path of operation of the screed. Further objects will be in part apparent and in part pointed out hereinafter.

The invention accordingly consists in the features of construction,,combinations of elements,

and arrangements of parts as will be exernplifled in the structure to be hereinafter described and the scope of the application of which will be indicated in the following claims.

In the drawing in which is shown one of the embodiments of my invention:

Figure 1 is a transverse section of a concrete road or the like partly broken away with a pair of screed supports in operative position;

Figure 2 is a side elevation of one of the screed supports shown in Figure 1; and

Figure 3 is an enlarged section taken along the line 3-3 of Figure 2.

Similar reference characters refer to similar parts throughout the several figures of the drawmg.

In the pouring of concrete roads or the like where the concrete is poured to a substantial depth and width and where the surface of the concrete is to be uniformly leveled, screeds of various types are employed. Screeds such as are used in leveling concrete roads are quite heavy and are usually operated by machinery which jigs the screed longitudinally and at the same time advances it along the road so as to level oi the concrete. Rails at the opposite sides of the road are provided on which the screed rides during its leveling operation. These rails, in turn, have to be supported and maintained at a proper elevation from the concrete form or forms.

Because of the substantial weight of the screed,

the screed rails are preferably massive and, therefore, in turn, require a substantial support.

It is in the support and vertical adjustment oi the screed rails that considerable diliiculty is encountered. For various reasons, the depth of concrete may vary not only longitudinally of the road but also laterally thereof. Accordingly, the screed rails must be raised or lowered at various steps with respect to the concret-e forms in order to maintain the uniformity of the exposed sur- 55 face of the concrete. Furthermore, it is undesirable that any portion of the screed support extend above the screed rail so as to interfere in any manner with the operation of the screed. Still further, the screed rails must be rigidly held in adjusted position against Vertical or lateral collapse with respect to the road surface, as replacement of the screed rail subsequent to the pouring of the concrete is extremely difficult. lt is a further object of this invention to obviate the above difculties in addition to others.

With reference to Figure l of the drawing, a pair of screed supports are generally indicated respectively at I0 and II. As these supports are identical, only one will be described. Support I0 comprises one of an indefinite number of similar supports located at suitably spaced centers along one side of the road secured to a form I2. Support II comprises one of a similar series on the opposite side of the road also secured to form I2. Supports I and I I respectively carry screed rails I3 and Ill, which extend longitudinally of the rod and support a screed bar I 5. After the concrete I6 has been poured, screed bar I5 is moved along rails I3 and I4 to level off the upper surface of the concrete.

screed support I0 (Figure 2) includes a base or chair generally indicated at I'I having a plurality of legs I8; preferably three or more legs are provided. The lower ends of legs I8 are bent to form feet I9, While the upper ends of the legs are bent vertically to form attaching arms 20. Arms 2i? are welded or otherwise secured to a coil 2I (see Figure 3) which forms a threaded socket for the reception of a lag generally indicated at 22. The opposite ends 22a and 22h oi lag 22 are provided with threads of opposite pitch, end 22a being adjustably threadable in and through socket coil 2|. Preferably the upper end of chair I'I supports a washer 23 disposed about lag end 22a and against which a lock nut 24 may be taken up to lock lag 22a in any desired position in socket coil 2l.

The upper end 22h (Figure 3) of lag 22 is threadably received in a yoke or screed rail car rier generally indicated at 25. Yoke 25 comprises a coil 26 forming threaded socket similar to socket coil 2l. Socket coil 26 is suitably secured, as by welding for example, to a pair of bars or

rods

21, 23 which extend vertically upwardly from the socket. These rods are suitably spaced by reason of their attachment to opposite sides of the socket and are welded to a U-shaft bracket 29. The bottom 29a of bracket 29 extends across the space between rods 21 and 2B and forms a carrying member for screed rail I3 (see Figure 1). Bracket 29 also serves to rigidify

rods

21 and 28 and to hold them in proper alignment.

Referring back to Figure 3, it will be noted that lag 22 includes an unthreaded portion 22e which forms a suitable grip for a pipe wrench by which the lag may be rotated in one direction or another to raise or lower yoke 25 to any desired position within the scope of adjustment of lag 22. As hereinbefore noted, nut 24 may be threaded down against washer 23 and thus the lag may be securely locked as adjusted.

The specifications on concrete jobs often prohibit exposed metal surfaces after the job is poured. To this end (with reference to Figure 1), feet I9 of chair I'I preferably rest on suitable blocks 30 formed of concrete or other suitable non-metallic material, and nails 3l are driven through feet I9 and blocks 3i] into form I2 to hold chair I? securely in place. Thus, the only exposed portions of the lower end of screed support I are the small ends of nails 3I and this is not objectionable. Additionally, this manner of securing the screed support to the form is advantageous as it precludes the necessity of drilling holes in the form to receive a portion of the screed support.

With reference to Figures 1 and 2, it will be noted that screed rail I3 extends a substantial distance above the top of yoke 25. the concrete I6 (Figure 1) is poured, its upper surface after leveling by screed I is well above the top of screed support I, thus completely enclosing the support. After the concrete has set suiiiciently to permit removal of screed rail I3, the portion of screed support II) which is left exposed by the removal of the screed rail may be patched in any suitable manner so as to cover up any exposed metal. Furthermore, by reason of the fact that the upper end of carrier yoke terminates below the upper surface of screed rail I3, the screed support itself in no way impedes travel of screed I5 along the rails.

As shown in Figure 1, my screed support is adapted to carry a supplemental screed rail 40. Such an additional screed rail is often desirable where different concrete levels are specified. The elevation of the upper surface of rail is predetermined in accordance with the upper surface of rail I3 so that the proper space between the surfaces is always preserved. Hence, raising or lowering yoke 25 by manipulation of lag 22 properly and uniformly adjusts both upper surfaces of both rails I3 and 40.

It may now be seen that screed support I0 may be accurately and securely positioned on form I2 and attached thereto by nails 3| driven through the feet I9 of the support. Also, the pro- Thus when vision of legs I8 provides substantial rigidity and practically precludes lateral or longitudinal displacement of the screed support with respect to the road.- By reason of the threaded ends of lag 22, vertical adjustment of the screed rails may be accurately and rigidly effected and such vertical adjustment may be maintained by lock nut 24. As noted before, the screed support terminates below the concrete level and hence does not impede operation of the screed.

Thus, I have provided an adjustable screed support which attains the various objectives hereinabove set forth in a thoroughly practical and eflicient manner.

I claim:

l. A screed support comprising, in combination, a base member a threaded lag mounted in said base member and vertically adjustable with relation thereto upon rotation of 'the lag, a threaded socket threadably mounted on the upper end of said lag and movable axially thereof upon rotation of the lag, and a yoke secured to said socket and raisable and lowerable upon rotation of said lag.

2. A screed support comprising, in combination, a base member including a coil forming a threaded socket, a threaded lag adjustably positioned in said coil, and a second coil threadably mounted on the upper end of said lag, whereby rotation of the lag effects vertical adjustment of said second coil.

3. A screed support comprising, in combination, a base member adapted to be secured to a form, said base member including a plurality of feet, an individual support for each of said feet adapted to be interposed between the feet and the form, said support including a threaded portion, a threaded lag mounted in the threaded portion of said support and adjustable in relation thereto, means for locking said lag in an adjusted position, a threaded member carried by the upper portion of said lag, and a screed supporting bracket secured to said threaded member.

4. A screed support comprising, in combination, a base member adapted to be secured to a form, a threaded lag secured to said base member and extending upwardly therefrom, the upper end of said lag being threaded, a threaded part carried on said threaded end of said lag and adapted to support a screed rail, rotation of said lag with respect to said part being adapted to effect movement of said part axially of said lag to adjust said part at a desired height, and means for locking said lag against rotation to maintain said part in its adjusted position.

LAMBERT J. ONEILL, JR.