US2787716A

US2787716A - Scaffolding

Info

Publication number: US2787716A
Application number: US464386A
Authority: US
Inventors: Henderson G Leonard
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-10-25
Filing date: 1954-10-25
Publication date: 1957-04-02
Anticipated expiration: 1974-04-02

Description

April 2, 1957 H. G. LEONARD SCAFFOLDING Filed Oct. 25. 1954 ga. g @fd TQ/4 nited States Patent Office SCAFFOLDING Henderson G. Leonard, Covert, Mich.

Application Gctober 25, 1954, Serial No. 464,386

1 Claim. (Cl. 304-17) This invention relates to improvements in scaffolding and more particularly to scaffolding of that type adapted to be readily attached to structural beams such as I-beams, inverted T-beams, girders, etc. that may form part of bridges and/ or other structures; and as readily detached therefrom, and that may be, while in use, anchored to such supports and depending therefrom and that may be shifted therealong to follow the progress of work upon said structures, such as repair work, painting, and the like.

An object is to provide scaffolding that is simple in structure, readily adjustable to accommodate the work in hand, that is of light weight, durable in use and inexpensive to manufacture. A further object is to provide scaffolding that is so constructed as to be safe in use, capable of use readily by persons with little previous experience with such devices and that occupies small space thus making it adaptable to work in close quarters and in places ordinarily diicult of access with conventional equipment.

vWith the foregoing and other objects in View as will hereinafter appear, the invention consists of certain novel features of construction, combination and arrangement of parts as will be described in detail, defined in the claim and illustrated in the accompanying drawing forming part of this disclosure, and in which- Fig. 1 is a view in elevation of the instant scaffolding illustrating its application, a conventional platform used in connection therewith being omitted.

Fig. 2 is an edge View of Fig. l,

Figs. 3 and 4 are detail views taken respectively on the lines 3-3 and 4 4 of Fig. l.

Fig. 5 is an elevational view of a modified lower portion of the scaffold.

Fig. 6 is a View of Fig. Staken at right angles thereto, and

Fig. 7 is a cross-sectional View on line 7-7 of Fig. 6.

The reference numeral 1 denotes a portion of a girder, inverted T-beam or the like having the flange 2 to which the instant scaffolding may be applied and/or anchored or adjusted therealong. The scaffolding includes the pendant scissors jack 3 the arms 4 of which are desirably round in cross section except beyond a point 5 from which to their free ends they are reduced in diameter to facilitate the scissors action, said arms each terminating in an upper jaw 6 and a lower jaw 7, the jaw 6 each having a head 8 and contiguous thereto a roller 9 retained in place by said head and a bend in the arm at its juncture with the jaw.

Secured, as by welding, to the arms 4 are the chain links 10, 10 connected to each other by the turnbuckle 11 by means of which the arms 4 may be adjusted to clamp an object such as the flanges 2. The arms 4 are connected to rings 12 which are connected to a single ring 13 which, referring now only to Figs. 1 and 2, is connected by the S-hook 14 to the yoke 1S secured to the upper end of the metal bar 16 formed with a plurality of round perforations 17 for cooperation with a flat bar 18 formed with elongated perforations 19, and with round perforations 17 aforesaid, the

bars

16, 18 releasably anchored to each other by bolts (not shown) removably secured in the round perforations 17 at the ends of said bars. Bolts 20 and nuts 21 releasably connect the elongated perforate portions of bar 18 to bar 16 to retain said bars in adjusted positions.

Integral with the lower end of the bar 18 is the dual hanger 22, each hanger portion being of square shape and of a size to accommodate a Wooden 4 x 4" beam forming part of a conventional work platform, this scaffolding being used usually in pairs to carry, in said hangers, the ends of the wooden beams at a point below the girder convenient for men to work from upon the platform. Scaliolding is applied to the horizontal girder or beam by releasing the turnbuckle 11 to spread the jaws and permit them to be applied to the flanges 2 and then again tightened thereupon. The scaiiolding is easily shifted along the flanges 2 by one man, the rollers 9 travelling upon same. The conventional platform includes a at tablelike board or boards nailed or Votherwise secured to the 4 x 4 beams, the ends of which extend beyond said board andV are received in said dual hanger.

Referring now to Figs. 5, 6 and 7 a ring 25, similar to ring 13, is engaged by a pig-tail hook 26 integral With one end of the flat bar 27 connected by bolts 28 having thereon nuts 29 to a similar bar 30 terminating in a single oblong hanger 31 adapted to carry a scaffold beam similarly shaped in cross-section, the said bar 27 connected also, permanently, to bar 30 by a terminal metal strap 32 and `an auxiliary strap 33.

In the form shown in Figs. 1 and 2 two beams are carried in the hanger 22 while in the form shown in Figs. 5 and 6 a single one is to be carried, the beams being used perch-like by the workmen who may sit directly upon same or upon boards or planks secured to or carried by the pendant structures, the pendant structures being provided in such numbers as may be desired depending upon the area of the platform and the number of workmen to be accommodated thereby at a time.

What is claimed is:

In travelling scaiolding for use primarily in overhead work in connection with I-beams having flanges, a scissors jack having twin arms pivotally connected to each other adjacent their lower ends, said arms adjacent the connecting pivot having flattened portions to permit maximum span operation, said arms having opposed, cooperating, integral, upper jaws at the upper ends of said arms extending at right angles thereto and opposed, cooperating,

integral lower jaws spaced below said upper jaws a distance slightly greater than the thickness of the 1-beam flanges, rollers carried by said integral, upper jaws for travel over the I-beam flanges, chains, an end link of each chain connected to each arm adjacent said lower jaw, a turnbuckle connecting the free terminal links of said chains for spacing adjustment of the jaws, elongated vertically extending superposed bars adjustably and detachably connected to each other, a ring attached to the lower end of each of said arms, each of said rings being attached to a third ring, said third ring being pivotally connected to one of said bars by a pig-tail hook, and a hanger carried by the other of said bars.

References Cited inthe tile of this patent UNITED STATES PATENTS 310,767 Wilson Jan. 13, 1885 680,322 Faust Aug. 13, 1901 842,331 Palmer lan. 29, 1907 1,211,997 Ahlander Ian. 9, 1917 1,561,850 Guttman Nov. 17, 1925 1,929,325 Masterson Oct. 3, 1933 FOREIGN PATENTS 12,173l Great Britain May 22, 1912 40,710 Austria Jan. 25, 1910 Patented Apr. Z, 1957 j