US3388771A - Scaffold structures - Google Patents

Description

June 18 1968 1 QACAORNELIUSEN I3,388,771

sCAFFoLD STRUCTURES Filed July 1, 1966 2' Sheets-Sheet 1 June 18, 1968 L.. o. coRNELlUsr-N 3,388,771

` scAFFoLD STRUCTURES Filed July l, 1966 2 Sheets-Sheet 2 IN V EN TOR.

few/4p@ @MQ/@Sew United States Patent O 3,388,771 SCAFFOLD STRUCTURES Leonard 0. Corneliusen, Prairie Industries, Inc.,

Terry, Mont. 59349 Filed July 1, 1966, Ser. No. 562,180 7 Claims. (Cl. 182-153) ABSTRACT OF THE DISCLOSURE A scaffold jack comprising a vertical standing frame including a pair of spaced side bars, an upper pivot bar connecting the side bars, a cross-member adjacent to and connecting the lower ends of said side bars, and vertically spaced loop means on each side bar adapted to slidably receive a lumber plank for extending the length of each side bar, a prop frame secured at its upper end to the pivot bar, and a prop pivoted at one end on the lower end of the prop frame and having longitudinally spaced hooks at its free end selectively engageable with said cross-member, said jack being collapsible to fold into one plane and being erectable to support one end of a scaffold with the prop frame pivoted to a substantially horizontal position and said prop bracing the free end of the prop frame from said lower cross-arm.

This invention relates to scaffold structure, and more particularly to multiple use jacks adapted to be used alone or in combination with readily available lumber for constructing different scaffold structures.

The primary object of the invention is the provision of efficient, Versatile, and lightweight jacks of the kind indicated which are adapted to be easily and quickly connected and disconnected from each other and/or from lumber components, and folded to compact easily portable and easily storable forms, such that the jacks can be carried to jobs in the contractors private car or pickup truck, instead of requiring to be transported in heavy and expensive trucks.

Another object of the invention is the provision of jacks of the character indicated above, which are formed to be used in conjunction with lumber components which are usually available at building sites, whereby the transportation of such components to the job is eliminated, as far as the jacks are concerned.

A further object of the invention is the provision of jacks of the character indicated above which are adapted to be used, in conjunction with available lumber components, for the construction, on the job, of such structures as saw horses, painters and plasterers scaffolds, wall scaffolds, and carpenters scaolds, and the like.

In the drawings:

FIGURE l is a fragmentary side perspective view of a painters scaffold of the present invention;

FIGURE 2 is a fragmentary end View of FIGURE 1, taken from the line 2 2;

FIGURE 3 is a perspective view of a single jack of the present invention, in collapsed condition, and minus the lumber components appearing in FIGURES 1 and 2;

FIGURE 4 is a fragmentary and contracted vertical transverse section, taken on the line 4-4 of FIGURE l;

FIGURE 5 is a side perspective view of a scaffold, like FIGURE 4, but minus lumber components; and,

FIGURE 6 is a fragmentary perspective view, showing a painters wall-supported scaffold engaged with a wall.

Referring in detail to the drawings, and first to FIG- URE 3 thereof, a single jack 10` is shown therein, which comprises a standing frame composed of a pair of normally vertical, upwardly converging side bars 12, spaced and connected, at points adjacent to their lower ends, by

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a lower cross bar 14. The side bars 12 are of angle iron form and have right angularly related first and second flanges 16 and 18, respectively. The first flanges 16 are in planes extending crosswise of the side bars 12, and the second flanges 18 extend laterally outwardly, relative to the first flanges, and are in the same plane with each other. The lower cross bar 14 is also of angle iron form, and has a first horizontal flange 20 and a second vertical flange 22.

The side ba`rs 12 are spaced and connected, adjacent to their upper ends, by means of an upper cross rod 24, which is journalled through the lateral or second flanges 16, of the side bars, the rod 24 being formed with retaining heads 26, on its ends.

The second flanges 13, of the side bars 12, terminate, at their upper ends in 45 degree angled terminals 28, which are formed with centered holes 3f), provided to pass bolts 32. The flanges 18 are further provided, adjacent to the terminals 28, with right angular stop flanges 34. Spaced along the flanges 18, from the stop flanges 34 and from each other, are rectangular loops 36. The loops 36 have cross members 38 which are spaced from the flanges 18, at distances, to accommodate between these cross members and the flanges 1S. The wide width of lumber lengths P, such as ordinary two-by-fours. The outer legs 40 of the loops 36 are secured, at their inner ends, to the free edges of the flanges 18, and are spaced from the lateral flanges 16 of the side bars 12, at distances to accommodate the narrow widths of the lumber lengths P. The inner legs 42 of the loops are secured to the inner sides of the first flanges 16 of the side bars.

A prop assembly 44 is fixed to the rod 24. The prop assembly 44 comprises a frame composed of a pair of similar downwardly converging side bars 46, of angle iron form, which have lateral flanges 48, facing each other, and coplanar flanges 50. The side bars 46 have deflected upper end portions 52, which are parallel to each other. The lateral flanges 48 of the upper end portions 52 are traversed by the rod 24, and they and the coplanar flanges 50 are suitably fixed to the rod 24.

At their lower ends, the side bars 46 are fixed together, their coplanar flanges 5f) having their facing inner edges cut away and securably engaged, as indicated at 54. Adjacent their lower ends, the lateral flanges 48 are traversed by a pivot bolt 56, having heads 58 engaged with the outer sides of the lateral flanges. A rectangular plate 60, larger in cross section than the side bars 46, is secured across their lower ends, and has a stop portion 62 extending laterally beyond the coplanar flanges 5).

A prop 64, of channel form, is pivoted at one end, on the prop bolt 56, and has centrally fixed to its concave side, and projecting from the prop, at least two longitudinally spaced hooks 66, whose bills 68 are parallel spaced from the prop and are directed toward the free end of the prop, As shown in FIGURE 5, the prop assembly 44 is arranged to be swung away from the standing frame '70, constituted by the side bars 12, the lower cross bar 14, and the rod 24, so as to be at a downwardly diverging angle relative to the frame 70, with the free end of the prop 64 overlying the lower cross bar 14, and with the lower of the hooks 66, engaged with the adjacent edge of the horizontal flange 2f), of the lower cross bar, so that the lower end of the prop 64 engages the floor, along with the lower ends of the side bars of the frame 70, so that such as a two-by-six lumber piece L can be supported, at one end, upon the rod 24, to define the related end of a sawhorse A, the other end of the piece P being similarly supported.

In FIGURES l, 2 and 4 is shown a painters or plasterers scaffold B, involving one or more lumber pieces L, laid side-by-side upon connected pairs of jacks 10, in which the jacks are opposed in downward divergent relationship, and are secured together, at their upper ends by mutual engagement of their angled terminals 28, through which bolts 32 are passed and tightened. In this arrangement, lumber elements P are engaged through the loops 36, with their upper ends engaged with the stop flanges 34, and with their lower ends extended below the side bars of the frames '70, and engaged with the floor.

In this arrangement, the prop assemblies 44 are swung upwardly to horizontal positions, and hooks 66 on their props 64 are engaged with the lower cross bars 14 of the frames 7l), whereby the prop frames are disposed horizontally, with related hooks of the props 64 engaged with the lower cross bars 14 of the frames 79, the lumber pieces L being laid upon the prop frames.

In FIGURE 6 is shown a wall scaffold, which is cornposed of a pair of longitudinally spaced single jacks 10, arranged, as in FIGURES 1, 2 and 4, to put their terminals 23 against a wall W, with the frames 70 disposed at an outward and downward angle, relative to the wall, and with one or more lumber pieces L, laid upon their prop frames.

As shown in FIGURE 3, when not in use, the jacks 19 are adapted to be collapsed to a fiat, compact form, wherein the prop assemblies 44 are folded down between the side bars 12 of the frame 7), and rest upon the lower f cross bars 14 thereof.

What is claimed is:

1. A scaffold jack comprising a vertical standing frame, a prop assembly including a prop frame pivoted at its upper end on the standing frame at the upper end thereof, said prop assembly having a prop pivoted at its lower end on the lower end of the prop frame, said standing frame having a cross-member adjacent to its lower end, and said prop having longitudinally spaced hooks at its free end selectively engageable with said cross-member, an upper rod extending between and journalled through the side bars at the upper ends thereof, said prop frame being fixed at its upper end to the said upper rod, said standing frame side members having coplanar flanges and lateral fianges on the inner edges of the coplanar dianges, vertically spaced loops fixed to said anges and having cross members facing the coplanar flanges, lateral stop flanges on said coplanar flanges above the upper one of said loops, and lumber lengths engaged with said flanges and extending through the loops, said lumber lengths having upper ends engaged with the stop fianges and lower ends extending below the lower ends of the side bars of the standing frame for engagement with a supporting surface.

2. A scaffold jack comprising a vertical standing frame, a prop assembly including a prop frame pivoted at its upper end on the standing frame at the upper end thereof, said prop assembly having a prop pivoted at its lower end on the lower end of the prop frame, said standing frame having a cross-member adjacent to its lower end, and said prop having longitudinally spaced hooks at its free end selectively engageable with said cross-member, an upper rod extending between and journalled through the side bars at the upper ends thereof, said prop frame being fixed at its upper end to the said upper rod, said side bars having angled terminals on their upper ends adapted to make mutual engagement with angled terminals on a companion jack, with the standing frames of the two jacks in downwardly divergent relationship.

3. A scaffold jack comprising a vertically disposable standing frame including a pair of spaced side bars, an upper pivot bar connecting the side bars, a cross-member adjacent to and connecting the lower ends of said side bars, and vertically spaced loop means on each side bar adapted to slidably receive a lumber plank for extending the length of each side bar, a prop assembly including a prop frame having a pair of side members and a width substantially equal to the length of said pivot bar, said side members being hinged at their upper ends to the pivot bar to swing about the axis of the pivot bar and being connected at their lower ends, and a prop pivoted at one end on the lower end of the prop frame and having at least one hook at its free end engageable with said cross-member, whereby said jack may be collapsed by folding both the prop assembly and the prop about their pivots to lie between the side bars of the standing frame.

4. A scaffold jack according to claim 3 wherein each of said side bars comprises an L-shaped cross-section angle bar, said loop means being angle straps affixed to the flanges of said angle bars to define tubular receiving passages for said lumber planks, and a stop secured to each said angle bar between the uppermost of said loop means and said pivot bar for engagement with the top of a lumber plank.

5. A scaffold jack according to claim 3 wherein said prop frame comprises a pair of downwardly converging side bars fixed together at their lower ends, the prop frame side bars beingy secured at their upper ends to said pivot bar, said prop being disposed between the side bars of said prop frame and having said one end pivoted to the prop frame side bars at the lower ends thereof.

6. A scaffoldv jack according to claim 3 wherein a pair of longitudinally spaced hooks are provided near the free end of said prop selectively engageable with said crossrnember, whereby to vary the inclination of said prop and prop frame with respect to said frame.

7. In combination, a pair of scaffold jacks each as described in claim 4, the angle bars of each frame having angled terminal tongues at their upper ends adapted to mutually engage the corresponding tongues of the companion jack, and means for securing the tongues of one jack to those of the other with the standing frames in downwardly divergent relation, whereby said prop frames may be swung outwardly into opposed horizontal positions to seat the end of a lumber plank platform at one end of a scaffold.

References Cited UNITED STATES 'PATENTS 363,483 5/1887 Ramsey 182-121 1,612,941 1/1927 Peachee 182-184 2,549,212 4/1951 Lane `TS2-181 2,611,570 9/1952 Kroll 182-225 2,846,274 8/ 1958 Nakano 182-181 2,966,957 l/l961 Ireland 182-224 2,330,766 9/1943 Walstrom 182-214 REINALDO P. MACHADO, Primary Examiner.

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