US2904126A

US2904126A - Multiplatform scaffolds

Info

Publication number: US2904126A
Application number: US555424A
Authority: US
Inventors: Victor W Meng; Arthur C Borgman
Original assignee: PATENT SCAFFOLDING CO Inc
Current assignee: PATENT SCAFFOLDING CO Inc
Priority date: 1955-12-27
Filing date: 1955-12-27
Publication date: 1959-09-15
Anticipated expiration: 1976-09-15

Description

P 1959 v. w. MENG ET AL 2,904,126

MULTIPLATFORM SCAFFOLDS 3 Sheets-Sheet 1 Filed Dec. 27, 1955 I h llslirlf p 1959 v. w. MENG ET AL 2,904,126

MULTIPLATFORM SCAFFOLDS Filed Dec. 27, 1955 I5 Sheets-Sheet 3 INVENTOR 5 United States Patent MULTIPLATFORM SCAFFOLDS Victor W. Meng, Garden City, and Arthur C. Borgman,

Franklin Square, N.Y., assignors to The Patent Scaffolding Co., Inc., Long Island City, N.Y., a corporation of New York Application December 27, 1955, Serial No. 555,424 *1 Claim. (Cl. 182-103) This invention relates to scaffolds, and more particularly to a multiplatform structure of this character adapted for use by bricklayers, masons and other construction workers above the ground.

The invention provides a scaffold with a plurality of platforms movable freely along a vertical frame to any desired level.

The invention also provides a multiplatform structure of the character referred to with one platform raised above the level of the other platforms.

The invention further provides a multiplatform structure which may be readily disassembled and erected at a different location.

Still further, the invention provides a multiplatform structure which may be added to existing conventional scaifolds.

Yet further, the invention provides a multiplatform structure which will reduce the time and effort for construction workers.

The scaffold of the present invention consists essentially of a plurality of uprights which are suitably spaced and transversely and longitudinally joined by a number of horizontal and inclined braces to form parallel rows of vertical ladders, a base support for the ladders, and a multiplatform frame which is vertically slidable along the uprights of said ladders, with one platform raised above thelevel of the remaining platforms. The frame carries a plurality of winches for raising or lowering the platforms to a desired level. 7

Other objects, features and advantages of the novel structure will become apparent in the course of the following detailed description of a preferred embodiment which is illustrated in theac'companying drawing, and and the invention will be finally pointed out in the appended claim. 7

1 In the drawing, wherein similar characters of reference indicate similar elements,

Fig.' 1 is a perspective illustration of the elevating multiplatform scaffold with .the bricklayers platform closest to the wall structure; v

Fig. 2 is an end view of the scaffold, as seen from the left in Fig. 1;

Fig. 3 illustrates a pair of modified vertically adjustable scaffold legs;

Fig. 4 is a view of a detached ladder forming one composite upright member of the stationary elevating scaffold frame;

Fig. 5 is a detailed illustration of one of the winches shown in Figs. 1 and 2;

Fig. 6 is an enlarged view of the upper end of the elevating scaffold, with the multiplatform frame in its uppermost position;

Fig. 7 is a top plan view of the hoist arm;

Fig. 8 is a section taken on line 88 in Fig. 6; and

Fig. 9 is an enlarged detail view of one of the upper sheaves, as viewed in the direction of arrows on line 99 in Fig. 6.

"ice

Referring now in detail to the illustrated structure, and more particularly to Fig. 1, there is shown a threeunit elevating scaffold 10, having a stationary frame 10a including four base members Ila-d, four composite upright ladders 12-15, each consisting of respective uprights 12a-15a and 12b15b, and horizontals 12c-15c, with cross braces 16a-18a and 1612-18b for connecting the base support members Ila-11d,

diagonal braces

19a, 19b, 21a, 2112 between upright ladders 12, 13,

braces

20a, 20b, 22a, 22b between

upright ladders

14, 15, and a hoist arm 23 attached to the top of ladder 15. The vertically movable frame 10b includes composite transverse horizontal base members 24-27, guard rail 28, four rigid structural members 29-32 integral with a corresponding one of base members 2427 of frame 10b, each of said structural members having a pair of verticals 29a32a and 29b--32b, and horizontals 29c--32c, each of said horizontals consisting of a pair of L-shaped members for supporting the ends of planks forming the platform C. Platforms A and B are supported on horizontal base members 24-27. Four winches gener-ally indicated by numerals 33a-d are rigidly attached to verticals 29b32b. These winches, in cooperation with various sheave wheels attached to the stationary frame lila and to the movable frame 10b, respectively, cause the frame 10b to ascend or descend along the stationary frame 10a into a position most suitable for, say, a bricklayer standing on platform A to pick up bricks stacked on platform C and continue with the construction of wall D, as shown in Fig. l. The platform tender or tenders standing on platform B are in charge of supplying the necessary materials for the bricklayers onto platform C, and also operate the rope 35 over pulley 34 on hoist arm 23 by means of which the supplieslare lifted from the ground.

The lowermost positions A, B, C of the platforms A, B, C are indicated in Fig. 1 in dotted lines.

Additional reinforcing and connecting braces 36a41a and 36b-41b are provided in the proximity ofthe upper ends of members 12-15. It will be noted that all braces With the exception of braces 19a22a and 19b 22b are so connected as not to impede the movable frame 10b when the latter slides along the members 12-15, suspended'on cables 42a-d, each cable having one end anchored in one of the respective cable drums 59a-d of winches '33ad (see Figs. 2 and 6), and the other end attached to the junction of respective upright and horizontal members 29a32a and 29c32c. Each of members 2427 also consists of a pair of spaced parallel beams, such as L-beams, with sheaves 43a-46a and 43b4 6b rotatably supported therebetween to slide along respective uprights 12a15a and 12b15b. As stated, horizontals 29c32c similarly consist of pairs of spaced parallel members with sheaves 47a-50a and .47b-50b therebetween to slide along the same uprights 12a15a and 12b15b. Cables 42ad pass over pulleys 51a54a and 51b-54b attached to the upper ends of uprights 12a-15a and 12b15b.

As better seen in Figs. 2 and 4, braces 16-18, 19-22 and 3641 are attached to uprights 12a-15a and 12b-15b by wing nuts 55a screwed onto bolts 55 but, obviously, any other suitable brace lock may be employed.

In Figs. 1 and 2, base members Ila-d consist of transverse horizontal I-beams supported on a pair of short units of the same contour, and each one of uprights 12a15a and 12b-15b is provided with a bore 56 for reception of studs 57, the latter being integral with bases 11ad and held in respective bores by cotter pins 58 or the like.

Fig. 3 illustrates an adjustable base for the uprights 12a15a and 12b15b in the form of vertically retraca 3 tive or projectable legs including base members 111, externally threaded inner leg members 157 and rings 158 which are provided with internally threaded nuts meshingwith the external threads on members 157 to -move the same/into rorfout of .the bores 156 in the respective .upfig'h'ts. Caster wheels may replace "blocks'111 to permit short-distancetransportation of the erected sca'fio'ld I "Winches'33a-d may be of any conventional construction, such as shown for example in Figs. 2 and '5. As illustrated, winc'h33a includes a cable drum 59a rotatably supported in frame 6000f inverted U-shape and securely connected to the upright member 2%. A pair of

ratchets

61a, 62a cooperate Withfpawls 63a, 64a, and a crank 66a is provided to operate 'the winch by rotating the drum 590 after the selected ones of pawls 63:1,:6411 eitheriengage orrelease ratchets 761a',62a.

' As illustrated in Figs. .6 and'8, one parallel beam of themem'berl29c is interrupted in the proximity of upright 12b to permit the passage 'of the ends of

diagonal braces

19a, 19b and 21a, 21b therethrough. A reinforcing diagonal beam"67a is shownin Fig. 6 to support the "platform'C.

While the hoist arm is shown at the right hand end of 'the multiplatform scaffold, it may be attached to any of theladders 12, '13, 14 or at both ends of the scaffold.

The planks forming platforms A and B need not be of 'a predetermined length "since these platforms are outside of the scaffold structure at all times. However, the planks of the platformC are cut'to size to fit between the respective 'L-members of horizontal supports 29c32c, whereby th'e horizontals 120-150 and uprights 12a--*15a and 1'2b-15b are free to move between the spaced 'elejm'ents 29c-32c. When the structure is mounted on casters, "it is simply pushed along the Wall, "whereas 'a lengthy transportation'requires dismantling of thescafiold. It is believed "that 'a center platform C lifted about 30 inches :above the level platforms A and Bwill be 'most convenient to the workers standing on the outer platform A.

The scaffold shown in 'Fig. 1 is open at its side facing the wall D so that the construction worker is free to reach for materials on platform C irrespective of the position of frame 10b. The structure is rigidly connected by braces 16-18, '3638, 3941 and 19-22, which simplifies the construction "of the 'slidable frame 10b since slots must be provided therein for passage of braces 19-22 only, braces 39-41 being above the uppermost 'lcvel'oftheplat'formframe 10b (see Fig.6).

It -will'be seen that we have provided a novel structure which consists-of a'stationary multi-unit, preferably collapsible 'scafiold and a multiplatform frame which is vertifcally slidable along the scaffold uprights, with one or more of the platforms -'at different levels. The platform frame and the scaffold are so constructed that a free movement is possible while one of the platforms is within the scaffold frame. -By providing vertically adjustable legs and caster wheels at the lower ends of the uprights, the structure is adjustable on uneven ground and trans All the elements of the stationary scaffold and the slid- -aole frame 'are so constructed and connected as to be easily and quickly disassembled for transportation or storage. The scaffold frame may consist of collapsible units which may be superimposed in a well known manner as is customary with elevated scafiolds.

Several changes and modifications may occur to persons skilled in the art within the spirit of this invention, and we therefore do not desire to be limited to the exact details -of-the device shown and described, but only by "the scope of'the-appended:c1aim.

We "claim: 7

In combination: two aligned rectangular sectional scaffolds each comprising two spaced parallel ladders, each ladder consisting of two interconnected uprights and each having an inner side and an outer side, means for connecting the upper and lower ends, respectively, of the ladders in each scaffold, and braces for connecting one upright of one ladder with the aligned upright of the versely beyond each ladder, an inner and outer plank support connectedto and-disposed above the level of each horizontal support, said inner and said outer plank supports-being parallel with and spaced from each-other for permitting the passage of a ladder therebetween, each inner plank support extending inwardly from the open side of eachscatfold and short of said secondside, the assembly of each horizontal support and an inner and an outer plank support connected therewith constituting a rigid unitmovable in vertical directions along one of I said ladders; a first'platform on said horizontal supports portable along the building under construction or repair. 3

adjacentto'the open sides :of said scaffolds; asecond platform 011 said horizontal supports adjacent to said second side; arp'lurality of horizontal platforms above the levels :of :said firstiand said .second platforms and each extend- :ing between adjacent .pairs of inner and outer iplank supports, respectively; and means for moving the horizontalisupports along said ladders.

References Cited in the file of this patent UNITED STATES PATENTS 378,810 Strout Feb. 28, 1888 554,024 Gilbreth Feb. 4, 1896 588,982 Gray Aug. 31, 1897 657,396 Curley Sept. 4, 1900 771,878 Laughlin Oct. -11, 1904 1,168,868 'Ericsson Jan. 18, 1916 2,790,684 Sprinkel Apr. 30,1957

FOREIGN, PATENTS 15,346 Great Britain Dec. 21, :1914