US2080916A - Scaffold and clamp for scaffolds and the like - Google Patents

Description

y 1937. D. H. HAYDEN 2,080,916

, SCAFFOLD AND CLAMP FOR SCAFFOLDS AND THE LIKE Filed Aug. 14, 1934 2 Sheets-Sheet 1 May 18, 1937. D. H. HAYDEN SCAFFCLD AND CLAMP FOR SCAFFOLDS AND THE LIKE 2 Sheets-Sheet 2 Filed Aug. 14, 1934 I l /anion audaimerfl Patented May 18, 1937 PATENT OFFICE SCAFFOLD AND CLAMP FOR SCAFFOLDS AND THE LIKE David Homer Hayden, Brooklyn, N. Y.

Application August 14, 1934, Serial No. 739,790

8 Claims.

The invention relates to scaffolds and clamping means for scaffold and like members. At the present time, in' constructing temporary scaffolds from metal bars, it is customary to use metal tubes which are connected at their points of intersection by sleeve-like couplings. The present invention provides improved clamping means for connecting flanged metal bars at an angle and thereby provision is made for constructing a scaffold.of flanged metal bars without necessitating cutting or boring holes in the bars.

The invention consists in the features of improvement hereinafter set forth, illustrated in the preferred forms in the accompanying drawings and more particularly pointed out in the appended claims.

In the drawings: Fig. 1 is an isometric diagram of a one pole ,scafiold.

Fig. 2 is an isometric view of a portion of the improved scaffold and clamping means therefor.

Figs. 3, 4, and 5, are views in elevation of the parts shown in Fig. 2, Figs. 3 and 5 being views looking in the direction of the arrows. 3 and 5, respectively, of Fig. 4, and in Fig. 3 the flange of theupright bar or pole is broken away to show the clamp member in elevation.

'Figs. 4m and 6 are sections on the lines ad and 6-6, respectively, of Fig. 4.

Fig. '7 is a plan view and Fig. 8 an elevation of scaffold parts illustrating certain modifications. Figs. 9 and 10 are isometric views illustrating modified forms of the clamp. H

In the diagram of Fig. 1, uprights o r poles are indicated at A, longitudinal laterals or ledgers at B and transverse laterals or putlogs at C. As well understood, the scaffold may consist of a single row of poles or uprights in which case the transverse laterals or putlogs are supported upon the wall of the building; or two rows of poles spaced flve or six feet apart may be used.

In the arrangement shown in Figs. 2 to 6 inelusive, the uprights or poles and the longitudinal and transverse lateral are formed of channel bars, with the longitudinal laterals B and uprights or poles A having their webs in contact and their flanges facing in opposite directions, and with the webs of each transverse lateral C in contact with one of the flanges of the upright or pole A. v

The clamp for connecting the flanged bars hand B. comprises two members D which are of the same shape or form. Each member in plan is triangular in outline and in elevation somewhat conical, having parts l0 and II oppositely inclined from its central portion. The central portion is provided with an opening to receive a tie bolt [2 and a flat face l3 against which the head of the bolt or the nut thereon bears.

On one side of the bolt opening and. on its inner face, the clamp member is-provided with a groove or seat M which embraces or extends over the edge of one of the flanges of one of the bars. The inclined portion or horn ll] of the member overlaps this same bar and is provided at its end with a seat l5 which engages the web of the bar.

The other inclined portion ll of the clamp member bridges one of the angles between the bars and is provided with an angular seat 5 (as most clearly shown in Fig. 5) which engages the corner or edge of the other bar. That is to say each member overlaps one of the bars, is provided with seats I4 and H) for engaging the flange and web of the bar which it overlaps and is also provided with an angular seat l6 which engages the corner or edge portion of the other bar, so that the two bars are thereby positioned in predetermined angular relation. As' a further aid in holding these bars in angular relation, each member is provided with an arc-shaped lug l.'| extending from its angular seat I6 and these lugs of the two members engage each other, bridge the angle between the bars and abut against the faces of the bars on opposite sides of the angle.

As noted, the two clamp members are alike in form and when in position and connected by the bolt i2 are disposed opposite one another. Also, the flange engaging seat or groove I4 is so shaped that, as most clearly indicated in Fig. 6, the member bears on the bar at one end only of the groove. That is to say, when viewed as in the lower portion of Fig. 4, each clamp member bears upon the bar it overlaps at the points I5 and at the right hand end of the groove l4, and 40 on the other bar at the point l6, and these three points of bearing are triangularly disposed. It is also noted that the bolt I2 is located substantially centrally with reference to these three points of bearing and, when the nut on the bolt is tight- 45 ened, the bars are very securely clamped. The clamp members are preferably formed of forged steel which is somewhat resilient and harder than the mild steel used to form the flanged bars and, since the members engage the bars at spaced points, they tend to bite into and securely grip the bars. 7

The clamp member D shown at the upper por-v tions of Figs. 2, 3, 4., and 5, is the same in form as that previously described. It overlaps the transverse lateral C, has seats I l and I5 engaging the flange and web of the lateral and an angular seat l6 and lug l1 engaging the edge of the upright or pole A. However, the part which overlaps the upright or pole A at this point is in the form of a hook [8 formed upon the end of the bolt H! which extends through the clamp member D. Preferably as an aid in positioning the bars, the loop portion of the bolt i9 is providedwith seats (see Fig. 4a) for engaging the edges of the pole A. It is particularly noted that it is not necessary to provide holes or openings in the bars. Also the parts are'so arranged that the connecting bolts each extend through the angle between two connected bars and closely adjacent the apex of the angle between the bars.

In the arrangement shown in Figs. '7 and 8, each pole or upright of the scaffold, for additional strength, comprises two channel bars A and A having their webs disposed at right angles toeach other as shown in the plan view, Fig. 7. The longitudinal and transverse laterals B and C are also in the form of channel bars with their edge flanges in contact and with their webs in contact with the webs of the uprights A and A, respectively.

At their points of intersection, the longitudinal laterals B and upright channel bars A are connected by clamp members D in all respects similar to those previously described for connecting the uprights and longitudinal laterals in the form shown in Figs. 2 to 6 inclusive. The transverse laterals C are connected to. the uprights A by similar clamp members D, except that the clamp members D and D are rights and lefts. To aid in distinguishing the rights and lofts, the clamp members D are preferably made with a rounded or curved and substantially conical outer surface and the outer surface of the clamp members D are formed of facets.

The channel bars forming the longitudinal and transverse laterals of the scaffold which have their'edge flanges in contact are connected at their points of intersection by clamp members The members of each pair are the same in form. Each comprises a portion 2i which overlaps the edge flange of one of the channel bars, is of sub- .stantially triangular form and has at one corner an offset lug 22 which overlaps the edge of the flange of the bar and also forms an angle seat which engages the outer face and edge of the flange. The portion 2| of the clamp is also provided with an angle seat 23 which engages the corner edge or angle between the web and flange of the bar. The portion 24 of the clamp member is offset or inclined relative to the portion 21 and bridges one of the angles between the two bars and at its end is provided with an angle seat 25 which engages the corner between the outer faces of .the flange and web of the other bar and rests upon these faces. The members of each clamp are provided with bolt holes so arranged that the connecting bolt 26 extends through the angle between the bars that is bridged by the clamp members. Both in this form of the clamp and in that previously described the parts are so arranged that the connecting bolt is very closely adjacent and preferably substantially in contact with the faces of the bars which are connected by the clamp.

It is noted that in both forms each clamp member bears on the connected bars at three triangularly spaced points. Each of the clamp -members E bears on the bar which it overlaps only at the spaced seats 22 and 23, and on the other bar at the seat 25. The other portions of the clamp member do not engage the bars. With this arrangement the clamp members very securely grip the bars.

In the form shown in Figs. '7 and 8, it is noted that as most clearly shown in Fig. 7, the lugs 22 on the clamp members E overlap and engage the edges of the uprights A and A. The joint shown in these figures is very strong and rigid and, in effect, prevents any relative movement of the connected bars.

' Fig. 9 is an isometric view of the clamp members E shown in Figs. 7 and 8. Clamp members E shown in the isometric view, Fig. 10, are quite similar to the clamps E except that the clamps E and E" are rights and lefts and are distinguished by providing them with curved and facetted outer surfaces.

As stated, the clamp members are preferably formed of forged steel and can be used for forming temporary scaffolds and other like structures used in the building industry to rigidly connect flanged metal bars without cutting or forming holes in the bars. It is particularly noted that the clamp members bridge one of the angles between each pair of connected bars and form bracing struts between the bars to hold them in predetermined angular relation and usually at right angles. v

Changes may be made in the details set forth without departure from .the scope of the appended claims. By using rights and lefts rigid joints are provided which prevent any relative movement of the connected bars.

I claim as my invention:

1. A scaffold frame having polesv and laterals formed of. flanged metal bars in contact at their points of intersection, and a coupling clamp for each pair of intersecting bars comprising two members, each overlapping one of the bars and extending across the angle between the bars and bearingon the other bar and a. bolt extending through the angle between the bars and connecting the clamp members.

2-. A scaffold. frame having poles and. longitudinal and transverse laterals formed 01' flanged bars, and a clamp for connecting the bars at each point of intersection comprising two separate cooperating members each overlapping one of the bars and having two bearing seats engaging the same and also having an offset portion provided with a. bearing seat engaging the other bar, and means for separably connecting said members.

3. A scafiold frame having poles .and longitudinal and transverse laterals formed of flanged bars, and a clamp for connecting the bars at each point .of intersection comprising two members each overlapping one of the bars and having engaged lugs bridging one of the angles between the bars to hold the same in predetermined angular relation, and a bolt extending through such angle and connecting the clamp members.

4. A scaffold supporting frame comprising poles and laterals formed of flanged metal bars having their webs in contact .andtheir flanges facing in .oppositeldirections, clam-p members, each extending over one of the bars and having seats engaging the flange and web thereof and having an offset provided'with an angular seat engaging thev edge of the other bar, and a members adapted to respectively overlap the bar and bridge one of the angles between the bars and form bracing struts to hold the bars in predetermined angular relation, each member having three triangularly spaced bearing seats, two for engaging one of the bars and the third for engaging the other bar, and a connecting bolt disposed centrally with respect to said seats and arranged to extend through the angle between the bars and closely adjacent the bars.

6. A clamp member for connecting flanged metal bars comprising a portion arranged to overlap one of the bars and having a bearing seat and a groove for engaging the web and flange respectively of the overlapped bar, the clamp member also having an offset portion arranged to bridge an angle between the connected bars and provided with an angle seat at its end for engaging the edge portions of the flange and web of the other bar, and the member having a hole for receiving a bolt extending outside of and. closely adjacent the connected bars.

7. A pair of like clamp members for connecting flanged metal bars at an angle, each comprising a part arranged to overlap the flange of one of the bars and having spaced angular seats for engaging the edges of such flange, and a relatively inclined offset portion arranged to bridge an angle between the connected bars and having an angular seat at its end for engaging the corner between the flange and web of the other bar, the said bearing seats being triangularly spaced and the members being arranged to be connected by a bolt disposed centrally with respect to said seats and extending outside and closely adjacent the connected bars.

8. A scafiold frame comprising poles and longitudinal and transverse laterals formed of channel bars, each pole comprising two spaced bars, and each of said laterals extending between and in contact with both of said bars and in contact with the other lateral, and independent

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