US2126844A

US2126844A - Putlog

Info

Publication number: US2126844A
Application number: US192496A
Authority: US
Inventors: Reinhold A Uecker; Ingar G Rambo; David E Beatty
Original assignee: SAFWAY STEEL SCAFFOLD CO OF AM
Current assignee: SAFWAY STEEL SCAFFOLD CO OF AM; SAFWAY STEEL SCAFFOLD CO OF AMERICA
Priority date: 1938-02-25
Filing date: 1938-02-25
Publication date: 1938-08-16
Anticipated expiration: 1955-08-16

Description

R. A. UECKER E1' AL PUTLOG Aug. 16, 193s.

Filed Feb. 25, 1938 3 Sheets-Sheet 1 hzvezmopew DiBa-effi) and Edryhold @Ueckaw f7/ Than@ Airomggy Aug. 1e, 1938.

R. A. UEcKER E-r AL PUTLOG Filed Feb. 25, 1938 3 Sheets-Sheet 2 Aug. 16, 1938. R, A UECKER ET AL 2,126,844

PPPPP G Filed Feb. 25, 1938 3 SheetS-Sheet- 3 Patented Aug. 16, 1938 UNITED STATES:

mit, 1

*PATENT orrlca 2,126,844 PU'rLoG ApplicationvFebruary 25, 1938, Serial o. 192,496

11 Claims.

This invention relates to scalolds and more particularly to a putlog for use on scaiolds.

In using scaffolds, particularly where work is being done on ceilings of buildings, it is desirable to connect parallel scaffold sections with a putlog so that planking may be laid over a comparatively wide area with a minimum amount of scaolding.

One object of the present invention is to devise a putlog which may be conveniently connected to a scaffold to enable a platform to be built between adjacent rows of scaffold sections.

A further object is to devise a putlog which will enable a platform to be built between scaffold ections at the same level as the top of the scafold. A

Another object isto produce a putlog which will extend in a line with the plank supporting member of the scaold.

Another object is to produce a putlog which v may extend at any angle to the scaold section.

-Another object is to produce a putlog which is adapted to support a scaiold section intermediate the ends thereof.

Another object is to produce 'a putlog whichA will be secure against-accidental disengagement from the scaffold section.

Another object is to produce a putlog in which the danger of disengagement from the scaiold is reduced to a minimum.

Other objects will become apparent as the description of the invention, as illustrated on the accompanying drawings, progresses.

In the drawings:

Fig. l is an end elevational view of two scaffold towers with a putlog connecting the same;

Fig. 2 is a cross-section on the line 2--2 ci' Fig. l, looking in the direction of the arrows;

Fig. 3 is a cross-section on the line 3-3 of Fig. 2, looking in the direction of the arrows;

Fig. 4 is a cross-section on the line 't-t of Fig. l, looking in the direction of the arrows;

Fig. 5 is a detail of a oor bracket for use where it is desirable to have a oor without the projections which occur when planks are laid on top of each other;

Fig. 6-is a View similar to Fig. 1 in that it is an end elevation of the assembly showing a second form oi putlog .applicable to varying center line distances between 'scaiold towers;

Figs. I and 8 are cross-sections on the line 'l-l and @-8 respectively, of Fig. 6, looking in the direction ofthe arrows;

Y Fig. 91s a perspective view showing a portion of a third form of putlog;

Fig. 10 is a cross-section on the line it-lil of Fig. 9, looking in the direction of the arrows; and

Fig. 1l is a plan View of a scaiolding employing a putlog of the type shown in Figs. 9 and l0.

Referring to the drawings, in which like numerals indicate like parts throughout the several views, the putlog 2li as herein defined comprises a truss 2| and a pair of

brackets

22, 22, one connected to each of two scaffold towers 24 and 25 to iorm a support for the truss, connecting the truss to and between the towers.

The scaiold towers shown are fully described in theU. S. patent to Reinhold A. Uecker,` No. 2,043,498, patented June 9, 1936, and comprise one or more end frames 26 superimposed on each other and joined by coupling pins 2l. Each frame comprises a pair of end posts 28, 2t joined by an upper horizontal brace 29 and a lower horizontal brace 310. Suitable shear braces 3l complete the end frame and form it into a rigid member. Suitable cross braces 33, shown only in Fig. 11 join the corresponding end frames constituting the towers 24 and 25 and hold the` end frames vertical. v

Figs. 1, 2 and 3 show the scaold towers 2t and 25 supporting a putlog 2B which is alined with and between the upper horizontal braces 29. As best seen-in Figs. 2- and 3 the bracket 22 for this form of putlog comprises an angle 34 welded onto the post 28 with the horizontal leg resting on the upper brace 28 and welded thereto. and a U- shaped retaining member 35 formed on the vertical leg of the angle to receive the end of the truss 2l. The lower end of the angle @t may be bent .outward to form an additional support for the retaining member.

The truss in the form of the putlog shown in Figs. 1, 2 and 3 may be conveniently formed from seamless steel tubing, and comprises an upper chord 38, a lower chord 3l and a plurality of shear absorbing braces Bt. The shear absorbing braces or members 3d may be merely vertical tubes Welded between the upper and lower chords where the spacing between the chords is slight, as in Fig. 6. However, where the truss is long, it is desirable to deepen the truss adjacent the center section, where the bending moment is a maximum, so as to more economically utilize the steel. As seen in Fig. l, it is desirable to provide such a deepened section with diagonal bracing which is more effective in absorbing the stress.

'In either type of truss, a'vertical shear absorbing brace 3B is fixed between the

chords

36 and 31 adjacent each end, and the truss held in the U-shaped retaining member 35 by a bolt and wing nut 39, which passes through both of the legs of the retaining member 35, and between times desirable to employ a guard rail 40 intermediate the towersv 24. Such a guard rail may beattached by means of a clamp socket 4| best shown in Fig. 4. The socket 4I is formed of a tubular member, receiving the lower end of the guard rail, with a bolt 42 connected to the tubular member and passing between the

chords

36 and 31. A retaining plate 43 ts over the bolt 42 and a wing nut 44 draws the socket 4| and the plate 43 into engagement with the chords and supports the guard rail 40.

If a smooth floor is desired (i. e. one in which no boards overlap) .T sections 45 may be welded to the top of the upper horizontal braces 29 and to the top chord 36 of the truss 2| in the manner shown in Fig. 5. Planking 45 may then be laid between 4the T sections which will support the ends of the planks.

The putlog 20 shown in Figs. 6 and 7 may be used where it is desired to spacer the towers 24 and at various distances, In this formof the invention the truss may comprise the two parallel chords 36' and 31' connected by shear braces 38 as described above.

The bracket, shown in Figs. 6 and '7, which is generally designated 22', to correspond with the bracket 22 of Figs. 1,` 2 and 3, comprises a U- shaped retaining portion 48 which is adapted to receive the truss 20, with one end of the U extended and bent back as shown at 49 to receive the horizontal brace 29. A .bolt 49' passes through the legs of the U-shaped retaining portion 48 and the backwardly extending leg 49 to simultaneously retain the truss 20 in the bracket and the bracket on the brace 29. The extended leg 49 is bent at such a position that the top of ther chord 36 is at the same elevation as the top of the brace 29.

The putlog 20 shown in Figs. 6 and 7 is used most extensively in positions where it is desirable to erect a third tower 50 on the putlog intermediate the towers 24 and 25. The bracketv used for this purpose is best shown in Fig. 8, and comprises an inverted U-shaped bracket 5I fltting over the top of the truss, with a tubular extension 52 'xecl to extend vertically upward from the closed end of the U. A-bolt 53 havingv a wing nut passes through both legs of the U and between the chords 3B and 31 of the truss to prevent disengagement. The end frame of the tower 50 engages over the tube 52, which holds it in position on the truss.

Figs. 9, l0 and 11 show a third type of putlog designated 20" adapted to be applied between scaffold towers at any angle to the end frames. The truss 2i shown in Figs. 9, 10 and 11 is similar to that described previously and consists of an upper chord 36', a lower chord 31 and a plurality of shear absorbing members 38 joining the upper and lower chords.

The bracket 22 shown in Figs. 9. 10 and 11 comprises a horizontal semicircle collar 55 with both ends extended and bent downward in a U- shaped retaining member 56, the truss 2| being engageable and retained in the member 56. The center of the collar ts around the upper end of the post 28, while the collar 55 rests, for all positions oi the putlog, on the brace 29. A U-bolt 51 passes around the post 28, through Having thus described the invention it is hereby claimed as follows:

1. In a. putlog for use with a scaffold tower including a pair of vertical posts and a horizontal brace connecting said posts, a bracket, including au-shaped retaining member engageable with an element of said scaffold tower, a truss comprising an upper chord, a lower chord and a plu'- rality of shear absorbing members joining said chords, and means engageable with said bracket and passing between the shear members `to prevent accidental disengagement of the truss from the bracket.

2. In a putlog for use with a scaffold tower including a pair of vertical posts and a horizontal brace joining said posts, a truss including an upper chord, a lower chord, and a plurality of shear absorbing members, a U-shaped retaining member adapted to receive said truss, a reverse bend at one end of said U-shaped retaining mem` ber adapted to t over said horizontal brace and be supported thereby, and meansl passing between said shear absorbing member to secure said bracket to said horizontal brace and said truss in said bracket.

3. In a putlog for use with a scaffold tower including a pair of vertical posts and a horizontal brace connecting said posts, a truss having an upper chord, a lower chordand a plurality of shear braces, a bracket including a U-shaped retaining member, adapted to receive said truss and enclose one of said shear members, with one end of said bracket .member extended and bent back to be received over and fixed to said horizontal brace whereby said truss is supported from said brace, and securing means' passing through said bracket and enclosing the shear. member therein to lock said truss in said bracket.

4. In a putlog for use withal scaffold tower including a pair of vertical posts and a, horizontal brace connecting said posts, a truss having an upper and lower chord, a bracket including a U-shaped retaining member, adapted to receive said truss, with one leg of said retaining member extended and bent backto be received over said horizontal brace whereby said truss is supported from said brace, and a bolt passing through said bent back end below said horizontal V brace and through both legs of said. U-shaped member between the chords of the truss to secure the bracket on the horizontalv brace and L the truss in the bracket. l

5. In a putlog for u se with a scaiold tower including a pair of vertical members, and a horizontal member connecting said vertical members,

6. In a putlog for use with a scaffold tower including a pair of vertical posts and a horizontal brace, a truss, a bracket including' a collar surrounding one of said posts and adapted to rest cluding a pair oi vertical posts and a horizontal j brace, a4 truss, a bracket includinga collar surrounding one of said posts and adapted to rest on said horizontal brace, and a U-shaped retain- 1 ing member carried by said collar and adapted to receive and support said truss, and` means to secure said bracket to said soaiold and said truss .in said bracket.

8. In'a putlog for use with a scailold tower including a pair of vertical posts and a horizontal brace connecting said posts, a truss, a bracket including a collar adapted to embrace said post above said brace. and to be supported on said brace, and projecting ends on said collar bent downwardly to form alined U-shaped retaining members adapted to receive and support said truss, and means to retain the trussassembled n with the bracket `and the bracket assembled with the scaffold tower.

9. In aputlog for use with a scaiold tower including a pair oi vertical posts and a horizontal brace connecting said posts, a truss, a bracket including a collar adapted to embrace said post above said brace and to be supported on said a0 brace, and projecting ends on said .collar bent downwardly to form alined Ll-shaped retaining members adapted to receive and support said truss, and a U- bolt passing around said post and passing through said U-shaped retaining members between the chords of' said truss to-clamp the bracket to the scaiold tower and the truss in the bracket.

10. A putlog lfor use withv a scaiold having a,`

horizontal member and a post, comprising a truss, a irst bracket embracing the truss, means on said bracket embracing the post of the scaffold and resting on the horizontal member thereof, a second bracket secured to said truss, said second bracket including a portion embracing said truss, means to secure. said truss within said portion, and means to secure said second bracket on a scaiold.

.11. A putlog bracket to secure a putlog truss to a scailuld having a horizontal brace and a vertical p'ost connected with said brace, comprisying a horizontal collar adapted to embrace the to'v