US1997462A - Wheeling scaffolding - Google Patents

Description

April 9, 1935. F. F. HANSEN WHEELING SCAFFOLDING Filed June 13, 1951 4 Sheets-Sheet l April 9, 1935. F. F. HANSEN WHEELING SCAFFOLDING Filed June 15, 1931 4 Sheets-Sheet 2 .lmil l INVENTOR.

A ril 9,1935. I F. F. HANSEN 1,9 2

WHEELING SCAFFOLDING Filed June 15, 1931- 4 Sheets-Sheet 3 April 9, 1935. F. F. HANSEN WHEELING SCAFFOLDING 4 Sheets-Sheet 4 Filed June 15; 1951 INVENTOR. .ZJZW 2:114 $5 ing points for hooking scaffolding sets together by ropes or other means.

Fig. 4 illustrates rubber vacuum cups as a means of fastening pulleys at the ends of the course; In order to create a proper base for their adhesion onrough or porous surfaces, coatsof a solution of collodion or another quick drying fluid maybe applied with Vaseline as an additional measurement in the line of greatest strain. yIt

means. V

- The single column 23, rising from thebase, is constructed to combine light weightwith strength being hollow andhaving its longest'transverse carries on its outside a toothed rack 24, shown in Fig. 5, engaging the 'two pinions 25, which,

through their shafts '26 and their bearings, carry the sliding unit of the trestle, "the framework or which unit is constituted by a'l'central hollow member 21 encompassing and in shape conforming to the central column, on which it slide's,jand

of two side pieces '28 connected to the former and with one another-by the tubular pieces 29 and #38, to which the bracing rods;3l are fastened.

Also such connection is more firmly established by the vertical cross wall 32,,its substantially horizontalcontinuation 33, shown in Fig. 6, theifront piece 34, shown in Figs. 6, v(and S and two groovedbottom bars strengthened byv the bridge 38, all of which pieces contributeto form a casing or receptacle for the plank end and, the mechanism for securing it. i

This mechanism is constituted by a substantially', horizontally disposed but: slightly sloping plate 4% supported by two wedges .31. and 38, one

wedge overlying the other, the wedgei38 being supported by theabove mentioned bars 35 on which it slides, its motion guided by two ribs on its underside conforming to. and bearing in. the grooves of the barsj Similarlythe motion of the wedges in relation toone another is guided by ribs engaging in groovesas illustrated in Figs. 6 and 7; QIeovertheir dislocation is prevented sideways by means ;of two rods 39 depending from the plate 40 and fitting into holes in the bridge 36, and by'two vertically disposed ribs 4! on the c'rosswallBZ, and vertically by the spring 42 connecting thepla te 40 and bridge 35. v

The Wedges are operated by-the screws 4.3,the degreeof their overlapping determining'the distance of the plate'4fl from the slightlysloping roof of the casing 33, between which twobodies the plank end can be clamped in place.

This mechanism unites the plank 44, Fig. 1

so solidly with the sliding unit of each trestle,

that they may be thought of as forming one'body,

,the stability of which can be furthermore increased'by tightening of the steel rope 45 and the two sets of ropes 45Iand 41, the plank thereby being caused to arch upwardly. The rope 45 is connected to the bottom rim of part"21 or one trestle passing to a correspondingly located. pulley 48, Figs. 6 and 8, on the other trestle, from there taking an upwardly slanting course passing through the pulley guide (Fig. .12) and fastening" on to the reel 49, the rotationoi which can be 1 stopped by engagement between the ratchet wheel 59 and the pawl 5i. The ropes 46 and 41, Fig.

" l, are at one end coupled together by a cylindrical piece 52, which fits into the grasp of a'twin set of hooks 53 011 one trestle,- from where the ropes 41 and .465passjjrespectively-to the reels 54' and 55011 the other trestle, as shown in Fig. 5, of which reels 55 are permanently connected with the shaftpassing through the cylinder 30, while reels 54 are releasably connected to'the same bymeans of the set screws 55 so that the tension of rope 41 can be regulated to correspond with that of rope 46, when their function as common carriers of paint pots, etc., makes it desirable. The pawl.

51, engaging the ratchet wheel 58 and controllable by means of a lever serves to arrest rotation of the-reels connected to theshaft; Figs, 13 and 14 illustrate 'a means of maintaining a given distance between the ropes 46 and 41, the position of the rod 55 being adjustable in relation to the tubular piece Bil, through which it passes, by use of set screw 63. 7

When the plank is secured to the sliding units 21, and the ropes are slack, its angle with respect to each of .the sliding" units 21 will be slightly less than- 90 degrees due to the slanting surfaces presented by plate 40 and the 'roof 33 ofithe casing as best shown in Fig. 6. By suitably tightening rope45 and then ropes 46 and 41 to slightly arch the plank 44 upwardly, the

sliding sideunits 21ymaybebroughtinto parallel, vertically. disposed positions, desirable. for

.thesmooth raising. ,-and:lowering. of same; In .order to further increase thecurvature and supporting strength of. the plank, 'WhiIeJnaintaining a parallel relation between vthe'sliding units 21,.cooperative tightening of'the lower rope 45 ,andthe upper sets of ropes .46 and 41 may be from where they passlby way of the pulleys 65- and 65 to the reel E51,'the rotation of which can be prevented by the pawl 68 engaging the ratchet' wheel '69. "The raising of, the plank, isjeffected .by pulling downwardly the V rods or. steps 10, best shown in Fig. l, connecting the sprocket chains 1| which drive thei wheel's 1 2, Fig.5,

mounted on the shafts 26, previously referred to, the lower one of-which carries the bevel gear .13, Fig. 7, whichengages the smaller gear. 14

carried by the shaft15, which, through the hearing 15, connects to the flexible orhserni-u i-l versal coupling 11,, the one represented being of standard makegfrom the other half of which it continues througdthe' self-aligning bearing 18 and ends on its-other sidev presenting features for coupling with the telescoping shaft 19, Figs. 1 and 9, which constitutes" the connection to the corresponding mechanisrnof ,the other trestle. Downward movement of the plank is prevented by action of the pawl fll best shown in Figs, Sand ll on the ratchet wheel SLwhich is in rigid connection with the framethrough the bearing 82.

After releasing its pressure on the framework as a whole, the lowering of the plank is effeet ed by the use of the handle 83, Figs. arc ne-111,

the mechanism of which allows for the disengagement between saidpawl andratchet wheel maintained as long as the handle is firmly grasped. 1 Guided h y-the pulleys 84 and 85 the cord. 86 passes from the pawl to the cylinder 81 sliding,pistonlike in the tube'8 8 and equipped with lugs 89 engaging with slots in the tubewall, thus preventing rotation. fToward the front the cylinder' continues into a portion, 90 of smaller d am t r. carr a to p 9 l a n. o passingring 92 furnished-withhinged connections 93 to two arms 94 which in turn hinge on to the handle leaves 95, the latter at their other ends being hinged to another ring 96 'to prevent the cylinder from sliding back. The 'application of this screw will be necessary in regard to one of the, handles, when the lowering of the plank must be undertaken by one person. It appears to me, that the above described scaffolding unit possessesnew and original fea-. 1 tures entitling me to'the claims, which I submit as follow: 7

1. In a traveling scaffold, wheels supporting said scaffold, a rope connected to said scaffold, anchored pulleyslocated beyond opposite sides of said scaffold, said rope passing over each of said pulleys and a portion of said rope being accessible from aid scaffold, braking means for said wheels, means for normally maintaining said braking means in braking position, and, means connected to said rope for releasing said braking means when said rope is tensioned.

2. In a scaffold having'a platform mounted for vertical movement and having means for adjusts ing the height of said platform, a crank for adjusting said means, said-crank being revolubly mounted, and a ratchet wheel non-revolubly; mounted adjacent said crank, said crankcomsyj prising a main lever, a crank handle consisting" of twoopposing wings swingably connected to" the outer end of said lever, each wing carrying a toggle, a spring pressed pawl mounted on said lever to engage said ratchet wheel, and actuating connections between said toggles and said pawl to cause disengagement of said pawl when said wings are moved toward each other.

3. In a scaffold having a platform mounted for movement in a Vertical direction and having means for adjusting the height of said platform, a crank for operating saidacljustmentmeans,

said crank being revolubly mounted in a position accessible from said platform, and a ratchet wheel non-revolubly mounted adjacent said crank, said crank comprising a main lever, a tubular member extending at right angles to said lever, a second tubular member revolubly mounted on said first mentioned tubularmember, a

crank handle consisting of two diametrically located wings, pivotally; attached to said second,

tubular member, a plunger located partially within said first mentioned tubular member, a pair of toggle arms, the outer end ofsaid plunger being connected respectively through said toggles to said'wings, a spring pressed pawl mounted on said lever and positioned to engage said ratchet wheel, and operating means connecting said plunger to said pawl to cause disengagement of said pawl when said wings are moved toward each other.

4. In a scaffold, twosupporting structures, a

. carriage mounted on..each of said structures for adjustable vertical movement with respect thereto, a cross member supported at its respective ends by said carriages, and means acc'esible from said scaffold for simultaneously and similarly operating said carriages, said means including two 4 pairs of sprockets, a. sprocket chain connecting each of said pairs of sprockets, and bars connecting similar portions of said chains and being disposedat right angles thereto. 7

5. In a scafiold, two supporting structures, a carriage mounted on eachof said structures for, adjustable vertical movement with respect thereto, a cross member supported at its respective endsby said carriages and coordinated means accessible from said cross member for simultaneously and similarlyoperating said carriages, said means 'includingtwo pairsof sprockets, a sprocket chain connecting each of said pairs of sprockets,

and 'bars jconnecting similar portions of said chainsandbeing disposed at right angles thereto. 6. In a scaffold, two rigid upstanding supporting structures, a carriage mounted on each of said structures for vertical movement with respect thereto, means for raising and lowering "each of said carriages, a cross-member, releasable clampingmeans mounted on each of said carriages, the ends of. said cross-member being respectively rigidly held by said clamping means but beingremovable therefrom and said clamping means each being disposed in such manner that said'cross-member will slope slightly upwardly, of said toward its. medial portion iroin each clamping. means. V 7. Ina scafiold, two rigid upstanding supporting structures, a cross-member attached at its respective 'ends to said structures, meansfor fixing the angle at which each of the respective end portions of said cross-member are disposed with respect to said structures, and means for drawing said structures toward each other to produce a longitudinal stress in said member to cause the medial portion of thes'ame to archupwardly.

8. In a scafiold, two rigid upstanding supportingstructures, a cross member rigidly secured at its respective ends to said structures, and tension members connected between' saidstructures for causing a longitudinal stress in said cross member to arch the same upwardly, one of said tension members being situated above said cross member whereby it is accessible to a person situated on said cross member for hanging tools and material containers thereon.

FOLMER. FORSOM HANSEN.

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