US2771324A

US2771324A - Demountable scaffold

Info

Publication number: US2771324A
Application number: US412970A
Authority: US
Inventors: Reginald D Ryder
Original assignee: Sun Oil Co
Current assignee: Sunoco Inc
Priority date: 1954-02-26
Filing date: 1954-02-26
Publication date: 1956-11-20
Anticipated expiration: 1973-11-20

Description

NOV. 20, 1956 j DE 2,771,324

DEMOUNTABLE SCAFFOLD Filed Feb. 26, 1954 v 2 Sheets-Sheet 1 INVENTOR. REGINALD D. RYDER ATTORNEY Nov. 20, 1956 R. D. RYDER 2,771,324

DEMOUNTABLE SCAFFOLD Filed Feb. 26, 1954 2 Sheets-Sheet 2 REGINALD o g 3 (Li 0. shmM ATTOR N EY United States Patent'O -2;771,324 DEMOUNTABLESC-AEFOLD meg in'a'ld DfiRyder, Brailner, Ohio, 'assignor to "Sun 70H C'Ompany, Philadelphia, "Pa., a corporation of New Jersey Application February. 26,1954, Serial No. 412,970 }4 Claims. ((35304 2) -be-,quickly erected and dismantled with =minimurn labor.

-=It iis a turtlrer-objectof the winvention to provide a scaffold; of small sections capable of being erected in a limited space a which because of the unique iarrangement of -the sections; provides a strong, sturdy structure.

Yet another object is to provide a scaffold of sturdy structure, sufliciently rigid to meet all working requirements in litnited space, yt 'sutficientlybpen "in framework to permit workingease within"and around the scaffold with a minimum of climbing .overa parts of'the structure.

iStill'another object is to provide -a tscaifoldof tubular rmemberswi-th a reinforced corner joint of suflicientrstability toe'liminate cross membenreiriforcing.

various other objects and advantages of this :invention will more .fully appear during the course of the following specification and will be particularly pointed out in the appended claims.

One form of the invention in the assembled form, with details of the several elements, is shown in the accompanying drawings, in which:

Figure 1 is a perspective view of the assembled scaffold in elevation;

Figure 2 is an exploded view of a vertical corner joint;

Figure 3 is an exploded view of the base assembly at a corner.

Figure 4 is an exploded view of the corner post, top rail assembly.

Figure 5 is an exploded view of an alternate form of corner post assembly.

Figure 6 is a sectional detail in elevation of the corner post assembly of Figure 5 in closed position.

Referring to Figure. 1 it will be seen that the seaflold is composed of a limited number of different shapes. Individually the shapes are limited in size and configuration to approach tubular structural limits. This requires minimum openings for the passage of the separate elements and permits ease of assembly in limited space. The sequence of assembly is easily understood, aiding construction in confined quarters, and, once assembled as shown, presents a rigid support for workmen.

In this figure, the corner posts 10 are one of the members duplicated throughout the structure. These elements, of equal length and diameter measurements, space the corner connecting members at equal elevations.

The corner connectors include

tubular members

12, and 21 with hubs on each end. These connectors, forming ledgers in that they are laid .horizontally,-.aremade withtwo .diiferent sized l-hubs. {The itubulanmern ber-s Y12 and 21 connect either Yhubs 14 ofsmaller size, or.-hubs 16 of larger size,-respectively.

.F'gure 2 illustrates thewuse, of these different ledger members in assembling :acorner. Themember with-the smaller hubs 14 islequal indiametersgexternal and -inter4 nal, to the corner .postslO. .A pin member .18 "-istfitted into the -hub 14-having an externalrdiameter equal to the internal hub and corner post diameter. Pin i I-Smay-be 'either permanently attached to hub 14,.m'aking a complete corner reinforcing member, or maybe placedias each corner is assembled .where the limitations of space require. This :figure' also includes the larger hub 16 which has an internal diameter equal to therexternal (diameter of the corner post 10. Such relative diameter- 'sizes per- -mit the'corner; post .10 to'embracethe pin Hand .in turn be enclosed; in the hub 16. It is evidentthat a rigid corner construction. is .therresult.

5 As .a .matter. of protection for those "who use :the 2 struc- "ture, a top railing assembly is added. *Without {this safety section, ,the structure consistssimply iof three different elements,.four it-pin 18 d s-counted; separately. This addition requires modified orncapping corner pos-ts 11, .-same .diameter as posts lfl, with. .the upper endv closed to .*hold ithetstud-rl 3. Tubular: .rnembers 1:19, lvfiattenednon .the ends and-dril1edtoitfit oversthe-istud .13,. are the top rails ibeingheld by -wing-nuts.-1 7.

The capping corner, posts-tl l, ta s iin'dicated iab'ove are ipartially interchangeable with tcorner. posts -10; gpartially iinterchangeable because they are limited ttoclosing'ithe top ofi the scaffold; yet can-.be used (over the pin '18 s and .in 'theihubs .16t-as indicated -innEigure 5. In tthis-tfigure showing-=21 variationwofit the structure ialready described, the capping corner post 11 has been substituted afOl' corner post 10 showing a top corner joint instead ofaan intermediate tcornerijoint as shown .in Figurez.

In Figures .5 and'i6, i to increase the rigidity and "stability .of the structure beyond that 'indicatedtin Figures =1,'. 2 and 4; :presently described, 'hub114 iis increased inwthicle mess .until .its external diameter: equals 1 the: external idiameter of hub 16, yet retains the internal diameter of pin 18. This thicker hub is denoted by the numeral 15 connected by tubular member 23 as shown in Figures 5 and 6. The sectional view of this corner joint in the closed position illustrated in Figure 6 shows the completed connection. The assembly is made as already described in discussing Figure 2. By reason of the increased thickness of hub 15 (over original thickness of hub 14, Figure 2) the bearing surfaces between the elements is increased as they are connected in fixed alignment.

The one remaining figure of the drawing yet to be described, Figure 3, will be better understood if it is described in the discussion of the operation of the device. If Figure 1 is considered together with Figure 3, it will be apparent that this scaifold rests on a. base built of these elements. A square is formed of four ledger members with the larger hubs 16. As corner posts 10 insert in these hubs, the double hub depth on all four corners supports the initially erected corner posts in the vertical position.

Ledger members of the smaller dimensioned hubs 14 are then placed to engage opposite pairs of corner posts 10. These ledgers are held in place and abutting the ends of corner posts 10 by means of pin 18. On the upwardly projecting portion of the pin 18, and arranged 3 l ledger is maintained as each corner post is separated only by the uniform length of hub 14'.

This structure procedure is continued, using either the hub 14 member or the variation hub 15 until the top is reached when eappingcorner posts '11 are substituted for corner post 10 and the top rails 19 are fastened into place. The choice of

hub

14 or 15 is not one of con struction difference as both are erected the same. Each type has its advantage of lighter weight or increased rigidity and both will serve equally.

By reversing the operation, the scaffold can be as easily disassembled. The simplicity of the elements reduces maintenance and requires no tools for handling. Assembly and disassembly can be accomplished in a minimum of space with a minimum of work. The number of elements ofdifferent shapes is reduced to a minimum, and an open scafiold permitting comparatively free movement in restricted space yet of sturdy, usable construction is provided.

What is claimed is:

l. A scaffold of successive tiers comprising a base tier of interchangeable corner posts, first type ledger members with hub ends of an internal diameter equal to the external diameter of the corner posts positioned to receive and hold said corner posts in the hubs; and additional tiers including a pair of second type ledger members with hub ends of an internal diameter equal to the internal diameter of the corner posts placed on top of opposed pairs of corner posts, pin members extending through the hub ends extending above and below the same holding the corner posts below and positioned to receive corner posts above said hubs, and a pair of ledger members with hub ends of internal diameter equal to the external diameter of the corner posts connecting corners unconnected by said first pair of ledger members and transverse thereto, andcorner posts inserted in said pair of first type ledger member hubs to embrace the pin members positioned by the pair of second type ledger members reinforcing the corners of successive tiers of the scaffold. Y

2. The scaffold as defined in claim 2 further characterized by the highest tier being modified to include capping eorner posts adapted to fit into the hubs of the pair of first type ledger members to embrace the upw rdly p j g p from he hubs of h pair of s c type ledger members, each of said capping corner posts being closed at' the top by a stud projection, top rails apertured .to fit over said stud projections, and fastening means to engage the studs and hold the top rails in position.

3. A scaffold comprising a plurality of sets of four transversely extending tubes extending in different horizontal planes, the lower set comprising four tubes each having end hubs, a plurality of sets of vertically extending tubular posts, the lower ends of the lower set of posts extending into the end hubs of the lower set of tubes; two opposed tubes of an upper set having end hubs of smaller diameter than those of the lower set and having pins adapted to extend into the upper ends of the posts of the lower set and into the lower ends of the upper set of posts, the other two members of the upper set comprising tubes with end hubs into which extend the lower ends of an upper set of posts; and four transversely extending reinforcing members secured to the upper ends-of the uppermost set of posts.

4. Coupling means having, in combination, vertical tubular corner posts of a demountable scaffold, a first type ledger member with hub end, said hub having internal and external diameters equal to like diameters of the tubular corner posts, a pin member of an external diameter equal to the tubular corner post internal diameter extending through the hub end of the first type ledger member and engaging with said corner posts, and a second type ledger member having hub end of an internal diameter equal to both the external diameter of the tubular corner posts and'the hub of the first type ledger member, the hub of the second type ledger member resting on said firs-t type ledger member and engaging the hub .thereof and the pin engaged corner post in said hub.

References Cited in the file of this patent UNITED STATES PATENTS 742,755 Uffelman Oct. 27, 1903 832,625 Ryan Oct. 9, 1906 963,030 Baleh July 5, 1910 1,273,143 Bryan July 23, 1918 2,043,498 Wecker June 9, 1936 2,361,614 Dugan Oct. 31, 1944 2,462,429 Sachs Feb. 22, 1949