US2306671A - Concrete screed and guide - Google Patents

Description

Dec. 29, 1942. G. M. TAMBLYN 2,306,671

CONCRETE scEEED AND GUIDE v Filed June 17, 1941 I5 Sheets--Sheet l gm El'. .l-.H' .rf-J In Dec. 29, 1942. G. M. TAMBLY-N CONCRETE SCREED ANDl @UlmJ 3 Sheets-Sheet 2 Filed Junel'?, 1941 l INVENTOR. 60mm/v Al, ,X21/161. YN.

Dec. 29, 1942.

G. M. TAMBLYN CONCRETE scREED AND GUIDE Filed June l'T, 1941 3 Sheets-Sheet 3 INVENTOR. 60H00 /I// 7J4M1. y/v. BY y, E I A T TOI? /YE V Patented Dec. 29, 1942 STT UNTI.

"aa-'rar rence 5 Claims. (Cl

This invention relates to a device for leveling and nishing relatively large concrete areas, such as floors, platforms, sidewalks, roadways, and the like. Such surfaces are nished by a surfacing device known as a screed and the priny cipal object of this invention is to provide a highly efdcient screed construction and highly eiiicient means for supporting and guiding the screed on the various types of construction which may be encountered by a builder.

Other objects of the invention are to vprovide a screed runway which will not be aiected by moisture, sand, cement, weather conditions, etc.; to provide supporting means for the runway by means of which the latter can be quickly and easily brought to the desired-height and to a perfect level; and to provide screed runway supporting means which can be adapted to concrete forms, structural members and other supporting structures.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efciency. These will become more apparent from the following description.

In the following detailed description of the invention reference is had to the accompanying drawings which form a part hereof. Like numerals refer to like parts in all views of the drawings and throughout the description.

In the drawings:

Fig. 1 is a plan view of the improved screed and its supporting structure as it would'appear in use;

Fig. 2 is a longitudinal section, taken on= the .gL

line 2 2, Fig. 1, illustrating a side view of the runway support or screed leg;

Fig. 3 is a cross section, taken on the line 3-3, Fig. l, illustrating a side view of the improved screed;

Fig. 4. is an enlarged cross section through the screed;

Fig. 5 is an enlarged detail side view of one form of screed leg used for supporting the screed runway;

Fig. 6 is a vertical section therethrough, taken on the line 6 5, Fig. 5;

Fig. 7 is a front view of the screed leg as it would appear when arranged for clamping a structural member;

Fig. 8 is a vertical section therethrough, taken on the line 8-8, Fig. 7;

Fig. 9 is a detail top View lof the clamping member employed in Figs. 7 and 8;

Fig. l0 is a detail View illustrating an alternate leveling head which may be used on the screed les;

Fig. 11 is a side view of the screed carriage;

Fig. 12 is a horizontal cross section therethrough, taken on the line I2--I2, Fig. 11;

Fig. 13 illustrates the improved screed runway in use supporting a vibrating machine on a road- Way;

Fig. 14 is a crc-ss sectional View, taken on the line Irl-I4, Fig. 13;

Fig. 15 is a similar View, taken on the line I5-I5, Fig. 13;

Fig. 16 illustrates a type of screed leg for use on the ground;

Fig. 17 is a vertical section through the leg of Fig. 16;

Fig. 18 illustrates an alternate form of leg; and

Fig. 19 is a vertical section through the alternate form, taken on the line I9-I9, Fig.- 18.

In Fig. 1, a typical floor form for supporting the concrete of a concrete door is indicated at I3 with the reinforcing bars in place thereon at I4. The concrete being poured is indicated at I5.

The improved screed is supported on longitudinally extending tubular members or runways I6 formed of pipe or metal tubing. The tubular members are supported from the floor form I3 by means of screed legs. The preferred form of screed leg comprises a head I1 provided at its top with a horizontally extending, cylindrical socket I8 through which the tubular members I6 can be passed. The heads terminate below the upper surface of the tubular member when the latter are in place in the heads. A threaded socket I9 is formed in the bottom of each head to receive the upper extremity of a threaded supporting pipe 20.

A clamp bolt 2| extends downwardly through the head, the head of the bolt resting on a shoulder 22 in the screed head. When the screed leg is in place, the pipe 26 rests on the forms I3 and the bolt 2I extends through the forms to receive a clamp nut 23 by means of which the entire leg is clamped to the form. The height of the screed leg is vadjusted by loosening the nut 23 and rotating the pipe 20 to the right or left so that the tubular member I6 can be brought to a perfect level.

In some instances, it is necessary to clamp the screed leg to a steel column, beam or other structural member. For such occasions, a clamping plate 24 is provided which is clamped to the bottom of the head Il by means of the clamp bolt 2|. The clamp bolt is held in an axial position by means of a plug 25 which is screwed into thc socket I9 after the pipe 20 has been removed. It is preferred to have a square hole in this plug for the insertion of a plug wrench.

The clamp plate 24 is held in place and prevented from rotation by means of an upwardly extending lug 26 which enters into any desired one of a plurality of receiving sockets 2l formed in the head depending on the position of the structural member. It can be readily seen that by simply tightening the nut 23, the clamp plato can be caused to engage the edge of a structural.

member, such as indicated at 28, to hold the screed leg in place thereon.

An alternate form of screed legr is illustrated in Fig. which provides very accurate and quick aligning adjustment. This form consists of a coupling member 29 threaded at its bottom to receive a threaded supporting pipe 30 and threaded at its top, in an opposite direction, to receive the lower leg of an adjusting screw 3|. The upper leg of the adjusting screw '3l is threaded in a direction opposite to the lower leg and is received in a threaded socket 32 in a screed head 33.

The screed head 33 is provided with an arcuate notch in its top for receiving the tubular runway member I6 as in the precedingform. The adjusting screw 3| is formed with a knurled flange member 34 by means of which it may be readily rotated in either direction. It can be seenthat, when rotated in one direction, it will separate the coupling 29 and the head 33 and, when rotated in the other direction, it will drawthese members together so as to provide ready means for leveling the screed runways.

The screed comprises a cross bar 35 to which a leveling beam 36 is attached by means of downwardly depending beam arms 31. The beam arms extend oppositely outward at their bottoms to engage opposite sides of the beam 36 and the latter is secured therein by means of suitable clamp bolts 38. The clamp bolts 38 pass through slotted openings 39 in the arms 31 so that the leveling beam may be accurately adjusted to a position parallel to the cross bar 35. The bottom face of the leveling beam is covered with a sheet metal facing 40 for contacting the concrete.

'Iwo leveling beams are provided, one presenting a fiat bottom with relatively sharp rectangular edges, as indicated at 4| in Fig. 4, and one i presenting a rounded bottom as illustrated in solid line in Fig. 4. The dat bottomed beam is preferable for leveling the rough concrete While maintain its constantly perpendicular with the axis of the runways I6. The slides 42 are cut away at their mid-portions, as shown at 41, so that they may be placed directly over the screed legs when desired.

It can be readily seen that the operator or operators can grasp the handles 43 and pull the screed back and forth over the concrete or the finish, bringing the latter to a perfect level determined by the level of the tubular runways I6. The screed can also be swung back and forth by pushing one side forward and the other rearward so as to give a rotating effect, since the sleeves 45 are free to rotate on the post 44.

It will be noted that there are no obstructions on the leg pipes so that they may be easily withdrawn and the small holes remaining can be easily cemented up.

In Figs. 16 and 17 an alternate form of leg is illustrated for useA in laying walks, roadways` platforms, etc. on the ground. In this form a pointed spear-head 48 is employed which is clethe rounded form is preferable for smoothing the finish cement coating.

The cross bar is sufficiently long to extend completely over the two tubular runways |6. The leveling beam is shorter so that it may be passed downwardly between the runways. The cross bar may be slid directly on the runways if desired, It is preferred, however, to employ suitable carriages on the runways to hold the cross bar in a perpendicular direction.

These carriages comprise inverted troughlike slide members 42 which ride on and slide along the tubular runways 6. A suitable handle 43 is provided to facilitate moving them. A vertical post 44 arises from each slide member 42 and a sleeve 45 is mounted on each post. These sleeves are provided with downwardly opening yokes 46 which fit over the cross bar 35 so as to 75 signed to be driven into the ground. The spearhead is cast with longitudinally extending iins 49 which act to guide it vertically into the ground. An axial socket 5G is formed in the top of the spear-head to receive a pipe support 5|. The upper extremity of the pipe 5| is threaded into a head 52 which may be any of the previously described heads, as desired.

The head 52 is formed with a clamping jaw 53 which closes one side of a runway channel 54 in its top. The clamping jaw is held in place by means of a clamp screw 55. By simply loosening the screws 55 the runways can be quickly and easily lifted from place.

With this form of screed leg the spear-heads are simply driven into the ground along the runway lines, the pipes with their heads in place are inserted into the spear-heads, and the runways are placed in the channels 54 and clamped in place by means of the screws 55.

Another alternate form of leg is illustrated in Figs. 18 and 19. This form can receive any of the previously described heads upon the upper extremity of a pipe nipple 56, the lower extremity of which has left-handed threads 5l which are threaded into a coupling block 58.

The coupling block is universal in its application. It can be placed on a pipe leg such as those illustrated at 20 and 5|. The bolt 2| of Fig. 6 can be inserted through it, a socket 5S being provided for the bolt head or the clamp plate 24 of Fig. 8 can be attached thereto, since a notch is provided for the lug 26. Height adjustment can be made by simply rotating the nipple In Figs. 13, 14, and 15 a tamping device is illustrated for use on the improved runways. This device comprises a pair of parallel cross memvbers 6| resting at their extremities on the runways. 'Ihe cross members are held in fixed parallel relation by means of end plates 62, welded or otherwise secured thereto. Handles 63 arise from the end plates by means of which the entire assembly may be slid along the runways. A motor platform 64 rests on the cross members to carry a motor 65 having an eccentric rotary counterweight 66.

A plurality of horizontal tamping bars 6'! are suspended below the cross members 6| on adjustable jack screws 68 by means of which the tamping bars can be brought to a perfect level.

The operation of the tamping device is clearly apparent. The operation of the motor, due to the eccentric counterweight, vibrates the tamping bars in the concrete as the device is drawn along the runways so as to settle, spread, and compact the concrete.

While a specific form of the improvementI has been described and illustrated herein, it is desired to be understood that the same may be Varied, within the scope of the appended claims, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent is:

1. Means for supporting a runway for a concrete finishing device comprising: a head member; va horizontally extending recess in the upper extremity of said head member for receiving said runway; a threaded socket in the lower extremity of said head member at right angles to the axis of said recess; a tubular leg threaded into said threaded socket for supporting said head; a bolt extending through said head and through said leg; and means on said bolt for clamping said leg against a supporting structure.

2. Means for supporting a runway for a concrete finishing device comprising: a head member; a horizontally extending recess in the upper extremity of said head member for receiving said runway; a threaded socket in the lower extremity of said head member at right angles f socket for supporting said head above a surface; and a bolt extending downwardly through said head member and said leg for clamping the latter into a surface.

3. A screed leg for supporting a pipe-like screed runway comprising: a head member; a receiving notch in the upper extremity of said head member to receive said runway; clamping means for clamping said runway in said notch; a pipe nipple threaded into the bottom of said head member; the opposite ends of said nipple being threaded in opposite directions; a coupling block threaded on the lower extremity of said nipple; and means for securing said block to a supporting surface.

4. A screed support comprising: a head member having a groove for receiving a screed; a

tubular leg inserted into the bottom of said head for supporting said head above a supporting surface; a bolt extending downwardly through said head and through said tubular leg; and means on the extremity of said bolt for clamping said tubular leg to said supporting surface.

5. A screed support comprising: a head member having a groove for receiving a screed.; a tubular leg inserted into the bottom of said head for supporting said head above a supporting surface; a bolt extending downwardly through said head and through said tubular leg; and means on the extremity of said bolt for clamping said tubular leg to said supporting surface, said tubular leg being threaded into said head so that the projecting length of said leg may be varied.

GORDON M. TAMBLYN.

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