US1511679A - Extension tower - Google Patents

Description

C. SCHWARZ EXTENSION TOWER Wm. M, 1924. 151mm Filed June 23, 1922- 2 Sheets-Sheet 2 IN VENTOR WIT/Masses Patented @ct. 1d, 192d.

CARL SCHWARZ, 035 PITTSBURGH, PENNSYLVANIA.

EXTENSION rowan.

Application filed June 23, 1922. Serial No. 570,441.

To all whom it may concern:

Be it known that I, CARL SoHwAnz, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and the State of Pennsylvania, have made a new and useful invention in Extension Towers, of which the following is a specification.

This invention relates to extension towers.

In the distribution of material. such as concrete in building operations, it is now customary to erect towers of sufficient height from the top of which to distribute the concrete throughout the entire building operations. These towers are generally of more or less skeleton formation built from heavy timbers and when the building operation is completed, the lumber entering into the make-up of the towers is practically lostor worthless. The construction of these timber towers is expensive, both from the standpoint of the lumber used and the labor necessary to build the same.

An object of this invention is to provide a tower capable of being used as the present towers are, (especially for concrete distribution) the major part of which is a permanent structure, capable of being collapsed for storage and transportation and of being extended to form the basis for a rigid and practical structure, capable of fulfilling all, the requirements which such a tower has to meet.

This, as well as other objects which will readily appear to those skilled in this particular art, I attain by means of the device described in the specification and illustrat ed in the drawings accompanying and forming part of this application.

In the drawings, Figure 1 is a view in side elevation of a tower embodying this invention shown in extended or operative position. Figure 2 is a view in sectional front or back elevation as the case may be of the upper portion of the tower shown in Fig. 1. Fig. 3 is a top plan view taken on line 33 of Fig. 2. Fig. 4 is a view in side elevation of the tower shown in Fig. 1, collapsed with the elevator rails and tie rods removed. Fig. 5 is a top view in section of the top of the structure. Fig. 6 is a view partially in section and partially in plan taken on line'66 of Fig. 1, looking downwardly. Figs. 7 8, and 9 are enlarged detail views of portions of the apparatus.

The tower in a general way consists of four series of lazy tongs so arranged and articulated as to form a hollow square open work structure capable of being manipulated from the base end thereof, 'soas to extend the same to the desired height and to collapse the same for the purpose of storing the structure or transporting it. y

The structure is mounted upon'a base and when extended to the desired height, is guyed against side movement and then formed into a rigid non-collapsing structure by means of horizontal tie rods and upright vertical rails forming elevator guides.

Each series of lazy tongs is made up of crossed levers 10 (shown in Fig. 9), each consisting of a bar-shaped body portion 11 having reinforcing ribs 12 and 13. The ribs are spaced at the center of the bar so as to allow the crossed bars to be riveted together as shown at 13 and the ends of the body portion are provided with holes or openings 14.

The co-operating series of lazy tongs forming the several sections of the structure are secured to corner brackets 15 illustrated in detail in Fig. 8. The ends of the bars 10 are preferably riveted to the corner brackets by means of shouldered rivets so that the bars can freely pivot in the brackets. Each pair of levers 10 for one side of a horizontal section of the structure are arranged so that the strengthening ribs 12 and 13 of one lever lie on the inside of the structure while those of the other lever lie on the outside of the structure.

The lower ends of the lowermost pair of crossed levers are pivotally connected to collapsible sill members 1616 which in turn, rest on sills 1717. 1 1

Two operating screws 1818 each provided on opposite sides of its center with oppositely arranged threads at its center is unthreaded and the unthreaded portion of each is mounted for rotation in a supporting bracket 19 carried on its sill 17. Screws 18 are threaded through threaded blocks 20 secured in the ends of sill members 16. The outer end of each screw 18 car? ries a worm wheel 21 and an operating shaft 22 carrying an operating crank 23 at one end is provided with worms 2424 which mesh with worm wheels 21. Shaft 22 is collapsible and the co-operating parts are preferably squared one externally and the other internally, so that both parts will operate in unison. and as one in driving worms 24:.

I Sill members which are collapsible, are fifefra-lili fortified shown iii 7 i Which'is' a View taken on line 77 of Fig.

'6 looking in the direction of the arrows.

One half of each member consists of a nel section having a cover plate closing its open side. 'VVithin this, a channel section 27 is fitted to slide. Channel 27 is provided With an end or abutment plate 28 and between t his andblock 20 two coil 2 9 ,30 ar'fconfi'lied can plate 2 is "provided with" an abutment end 31 7' ih s i fi i li b infi tech e 27 and f rms 'one abutment for two eoil springs was 201 other the series of similar to 3'0. opposite ends of. these springs abut against end sins i7 are apporad on stationar .f oiindationsills s2. Assails 16 are moved a v, All: "sills'l'l' will be cause to approach dne anii'ect sanie tcgithefi and to sills this the tower iseollapsed by reverse inbveiiieiit oiserews 18; sil members 16' will be foi'ceid it b? the stress amt sills 1'? sin be for ifd empty the springs 29 as tion to siues;

The four sex-1656f lazy tongsattli eir top I support the tower head and the four iiieiiib'eie 3e inningup: this head can; ra ned iii slibs'tahtiauy the" sanie manner as one of th'siill members" 16'. Each member '33 at its eras-ran emf-16 a block at formed was an eye in; a gu was or cable. The block is; ans-la the end 'Of'tli channel reenter i o'riiiin'g'fl ens enis-a or mem er-13s, by a rivet 36 which pass s'thieugn the channel member; the block 8, and iiil ila plate 37 with which inner channel member "38 of mglabeg' s3 is rovi ed. y na amass, the iourmem'bersas are held in nit-psian: form a square havingcollapsible Aft'ei; themes-1* is xtended td the as} sired. height; horizontal "tfo'iiiie'etiljig Bars 39 I are hooked in place in holes formed for that purpose in brackets 15 and by ineans of turn-buckles 41 these horizontal connecting bend ear; anotli'eif b." wa of screws is members are tightened up so as ,to stiffen the sesame The eievatbr rais n are next positioned and bolted iii place to the levers 10. The opening between stiffening ribs 12 and 13 on the inner levers 10 is of such len 'th as to accommodate the elevator rails.

.55 springs confined within top members 33 are areferably of such length that they will no seated with their abutments when the tower is collapsed, nor n1 has reached about Half of its enshe height.

If desired,- this m y alga e tite- Oi p'i'in s 29 nd 30 farming part a sillinein are it.

An elevator or cage 43 is to slide within elevator guides 42 and 116 operated iiieans of a suitable penis, 44 which passes overpulle'y's" 45 and 46 carried "on caiheaa i7.

While i have de sest-ea tat ens eaten-t wotin wheel oii ea'ch rot and a telesco ing worm shaft fer driving said woilh wheels: p a

2.,111 an extensible tower, ij'bui series of interconnected ceoperaiir inz tongs fansing a rectangular eitensible str'uctiiie', a

ili i,l i aii ble tqivei liead seemed t6 Siiid ongs and means i'b'i raising a d lowering the structure.

11 ,an extensible power, multiple series of interconnected cooperating" laz'j' tongs forming a hollow extensible snwictui'e, k tlii eatle'ol rods io'i spewing Said my t dllgy a warm, w en on teen rd and ail" ktnsildle woriii s liaft foi' driving said woi'lr'i wheels. V v Iii testimony veer-ear, I have hereunto subscribed my naiii this 15th dayoi' line,

1922'. v i i I CARL senwlnz.

oi the invention as set

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