US1471304A - Safety portable scaffold - Google Patents

Description

Oct. 16, 1923. 1,471,304

J. F. YOUNG S SAFETY PORTABLE SCAFFOLD Filed July 6, 1922 2 Sheets-Sheet 1 MHHHHHQ WITNESSES 'NVEVTOR ATTORNEYS J. F. YOUNG SAFETY PORTABLE SCAFFOLD Filed July 6, 1922 2 Sheets-Sheet 2 70 l'Y/VESSES XXV am ATTORNEYS Patented @et, id, 1923.

JOSEPH FREDERICK YOUNG, 93F MGEIt-ISTGVVN, NEW JERSEY.'

earner roarnernsoarrorn.

Application filed July 8,

vented a new and Improved Safety Portable Scaffold, of which the following is a de scription.

My invention relates to scaffolds to be used.

by painters, carpenters, or others doing work requir ng the use of a platform arranged to be raised or lowered by degrees and the general object of the invention is to. provide a safety scaffold that may be raised or lowered with convenience and in which the platform is arranged to be securely held in the adjusted position. I

A further object of my invention is to provide a scaffoldiniproved in various particulars with respect to its portability and the facility with which the scaffold can be as sembled or disassembled. I

The invention also has in view the production of a light portable structure that can be handled readily by one man if necessary. 7

The invention contemplates furthermore to make it impossible ion the platforinto drop except at the will ofthe person using it and to positively prevent the platform from swaying in any direction.

Reference is to be had to the accompanying drawings forming a part of this specification, it being understood that the drawings are merely illustrative of one example of the invention. I

Figure 1 is a side elevation of a scaffold embodying my invention showingv the same in position for use;

Figure 2 is a fragmentary side'elevation with the raising means for the platform in difierent position; I r

Figure 3 is a front elevation of a scaffold;

Figure 4: is a vertical section given to show the raising and lowering assemblage at the inner surface of a side rail Figure 5 is a plan view showing the at tachment provided atthe top of each side rail; V I I Figure 6 is a sectional plan view as 1nd1 cated by the line 66, Figure 3.

In carrying out my invention in accord ance with the illustrated example side rails or supports 10 are provided. A tie bar or girt 11 extends transversely between the side platform by engaging the bars 20.

1222.1 Serial No. 573,127.

rails has vertical slots 12 extending from the lower edgeadapted to receive bolts 13 on the side rails the bolts having wing nuts 13. Diagonal braces 1a are provided on the tie barll and secured bolts'15 and wing nuts 16, the'bolts being received in slots in said braces, the arrangement being such that byllooseningthe wing nuts13, 16, the girt. or tie bar be detached and when the tie ispositioned the side rails 10 will 'be'ieldi'irmly and spacedy adapted to be placed against a wall of a building." I At the upper end each side rail h'as'a'clip' 18'secured thereto and formed with diverg ing terminals to contact with the face of a building the building.

for holding the scafiold out from The platform 19 of the scaffold is support- I ed ateach end on bars 20, providedat'each side rail 10 and disposed transversely to said platform. The platform in practice is preferably made of sheet metal qhaving depend ing flanges 21 for strength. The-platform 19 is' formed at its ends with acut-out portion 22 n which fit the side rails'lO; I The platform 1:9 is supported on transverse supporting bars 20 carried by the slides 24. The flanges 21 are continued atthe endsof the platform 19 as at'2l, said'fianges 21, 21 preventing undue displacement ofthe Eachbar 20 is carried by'a slide 24; on

the adjacent side rail 10, .saidslide having lateral flange25 beneath each bar 20 and atransverse pin 26 passing through the bar 20' and slide 2 1 completing the connection. The pin 26 secures also the bar 20 and slide 24; ton link 27 the upper endof whichis' offset obliquelyjand pivoted as at 28 to an end of alever 29 fulcrumed on a slide'30 corresponding with the slide 2 1. A' U- shaped dog 31 is provided in association with theslide 24, to embrace rail "'lO'and-a similar dog 131. is providedin association with up er slide 30. Thelower'dog 3l has a cross bar 32between the side arms of said dog and a's'pring 33 issecured at one end ofsaid cross bar 32 and to the link 27 tending to rock the dog into engaging position. The dog 31 (as also dog 131')*' has a cross bar 34 at the inner side of the side rail 10 and a cross bar 35 above and at the outside of said rail 10 and adapted to engage in any one of a vertical series of notches 36 in the respective side rails 10. The dog 181 has e spring 138 secured to its cross bar 32, the lower end of said spring being secured to the fulcrum 38.

llt will be observed. from Figure 1 that the outer cross bars 35 engage or dog into adjacent recesses 36, thereby sustaining the platform 19 in position. Upon the lever 29 being rocked upwardly the bar of the lower slide 24 will'take the resistance and sustain the platform 19 while the movement of the lever about its fulcrum 28 will raise the upper slide 30 and thereby carry the upper dog 131 upwardly for its bar 35 to engage a notch '36 above that notch shown engaged in Figure 1 (see Figure 2). Upon the lever being new rocked in a downward direction the upper bar will take the load and resistance of said lever 29 while the lever will through the link 27 lift the lower slide 24: and with it the platform 19. in this way the rocking of the lever may raise or lower the platform and dog assemblage by step by step movement.

A. guard rail 39 is provided in the to m oi a rod extending between the levers 29, the ends of the joar being downturnedinto hook form t5 engage in eyes all) in the lever. This rail acts only as a guard. for the workmen on the platform and may be removed whenever desired. 23 is a depend ing flange on plattorm lQ for strength.

I would state in conclusion that while the illustrated example constitutes a practical embodiment of my invention, do not limit myself strictly to the exact details herein illustrated, since, manifestly, the same can be considerably varied without departure from the spirit of the invention as defined in the appended claims.

Having thus described my invention, l claim:

1. A scaiiold including side rails, a platform, slides on the respective side rails and carrying said platform, dogs associated with the slides, said dogs engaging or disengag ing the side rails by move ients of the slides, means to actuate said slides, said means including a lever adjacent each side rail, and a guard rail detachably held by its,

ends on the respective levers.

2. A scaffold including side rails each formed with a series of notches at one side thereof, a slide on each side rail, dogs carried by said slides for engaging said notches, additional slides on the side rails below the first slides, a platform carried by the second-mentioned slides, a lever carriel by the upper slides on each rail, a connection between each of said levers and the of said slides in res onse to the rockin or i ,svnsea lower slide on the same rail, and a dog on each slide, said dogs adapted to engage or disengage the rails by a movement of said slides in response to the rocking of said levers.

3. A scatlold including side rails, a slide on each side rail, additional slides on the side rails below the first slides, a platform carried by the second-mentioned slides, a lever carried by the upper slides on ea 1 rail, a connection between each of said levers and the lower slide on the same rail, and a dog on each slide, said dogs adapted to engage or di engage the rails by a IDOVQHEQ said levers; together with springs secured the first-mentioned slides and to the adjacent dogs, and additional springs secured to the other dogs and to the connecting means between the levers and the second-mentioned slides, said springs tending to eiiect engagement between the dogs and the side rails.

4. A scaffold including side rails formed with notches at one side thereof, upper and lower slides on each rail, each provided vith dogs engaging said notches, a bar carried by each lower slide, a platform extending between said lower slides supported on said bars, a lever tulcrumed to each upper slide, and a bar pivotally secured to each of said levers and to each of said lower slides, said levers when rocked upwardly raising said upper slides and causing the dogs or said slides to engage the notches immediate ly above the slides and when rocked downwardly raising the lower slides causing the dogs of such lower slides to engage the notches immediately above said lower slides.

5. A scaffold including side rails, transverse and detachable tie mean for said side rails, said tie means comprising a bar formed with a laterally extending and open slot at each end thereof and an angularlydisposed reinforcing member connected adjacent each end of said bar and each formed at the opposite end with a slot, said slot being open at one end and extending oblique ly to the longitudinal axis oi? said bar, means passing through the slots of said bar and the slots of said reinforcing members for detachably securing said tie means to said side rails, said bar and reinforcing members being detachable as a unit from said side rails, a platform movable up and down said side rails, means slidable on the respective side rails and supporting said platform, and means for clamping said sliding means at various heights on said side rails,

JOSEPH FREDERICK YOUNG,

Images