US1588295A - Collapsible platform scaffold ladder - Google Patents

Description

7 June 8 1926.

- 1,588,295 J. BERMAN 4 COLLAPSIBLE PLATFORM SCAFFOLD LADDER Filed May 6, 1925 2 Sheets-Sheet 1 Iwvenl'o': ficobBer/nan Patented June 8, 1925.

UNITED STATES JACOB BERMAN, or REVERE, .MASSAGHUSETTS.

COLLAPSIBLE PLATFORM SOAFFOLD LADDER. I j

Application filed Ma a, 1925 Serial No. 28,517.

The scaffolding structure involved herein is' of the collapsible ladder type carrying aplatform. Such a structure affords various features of advantage over fixed scaffolding and over improvised structures in which ladders are employed to support a platform. One of the great difliculties with any such structurewhich is to beused from time to time and at different places is its portability and compactness, whether in transit from one job to another, or whether in storage between jobs. It is furthermore of great importance that such structure be readily set up and knocked down, and also that it be capable of a wide range of adjustmentwhile still being strong and stable.

My invention involves improvements embodying these features and for the purposes of illustration I have shown an embodiment of my lllVEIltiOll having a maximum degree of the advantages sought, with a minimum of complication and expense. .Such an embodiment is shown in the accompanying drawings. T hroughoutthe specification and drawings like reference characters are e1nployed to indicate correspondingparts, and in these drawings:

Fig. 1 is a perspective view of suoh a scaffold ladder in erected and fully extended position.

Fig. 2 a section on the line 22, of Fig. 1, looking down the ladder, but with the lower end structure omitted;

3 is a fragmentary side view of the extensible ladder portions.

Fig. i a detail of a brace portion.

Fig. 5 a sine view of the scaffold in its lowest position, and

6 a similar view with the scaffold in its intermediate position, the platform railing being omitted in Figs. 5 andfi.

In such a structure I provide a base 1 which affords a stable support on the floor or on the ground or on a wheeled truck (not shown) where such is desired. On the base there are a pair of longitudinal flanges which may be conveniently formed of angle irons 2 bolted to the base plate. On eacn side of the base and adjacent one end thereof I provide sen'ii-circular bearings 9 and 10, having substantially semi-circular bearing edges on which are cut racks 9 and 10 These sectors 9 and 10 may be conveniently bolted to the upstanding flanges of the angle irons 2 by bolts as at 3, 4: and 5. Pivoted on a shaft 11 which is mounted centi-ally of the sectors 9 and 10 are the sides of .the lower section of the, ladder 22. As will be seen by reference to Fig. 2, thesea-re channel irons with the channels faced inwardly and in them are mounted the rungs 21. Adjacent the lower end of the ladder are a pair ofshafts 19 and 20. The upper shaft 20 has a crank by which it may be rotated, and has a pinion 16 at one end meshing with thepinion 15 ona shaft 19, and preferably a pinion 18 meshing with a pinion 17. The pinions 17 and 15 mesh with the semi-circular racks 10 and 9 respectively, so that the ladder section can be swungat any desired angleor raised or lowered by a swinging movement on 11 as in ELXlS.

Slidably mounted on one flange of the side members 22 is the second extension 23. This member consists of the main channel member 23 and is itself a channel" member, the members of the two sides having their channels directed outwardly so as to have bearing on one of the flanges ofithe lower member 22 The opposite flange of the channel member 23 has a corresponding-engagement with the flange oft-he top member 24. These top members are similar pieces but the top members have their valleys faced inwardly as in the case of the 22. I The membersare further guarded and braced by a channel shaped filler 26 whichis attached to the bottom members of the side pieces 23 so that the tartwardly directed flanges of the combined members 23 and 26 each embrace an inturned flange of the members 22 and 24. The members 22 carry an extension gear shaft adjacent each end. These shafts are rotated by standard handle members 25 and each have a pinion 27. The lower pinion 27 meshes witha rack 28 on the middle section 23. The sections are thus capable of being elevated or lowered independently. Just below the lower shaft 30 is a cross piece 31 carrying a pawl 29 and a corresponding pawl 29 on cross piece 31 is also provided adjacent the upper shaft 30. These pawls are balanced to ratchet on the racks 28 and 28 so that the ladder'extensions will be firmly held at any degree of elevation to which they may be raised.

At the opposite end of the platform 1 and detachably pivoted to the side flanges 2 are a pair of scaffold posts 38. These are provided with rungs 39 so that the scafiold may be utilized as a ladder if desired, and so that'they'may be utilized to support-the platform 32 which has underlying members- 34 and is preferably providedwith a. guard.

rail 35. The scaffold comprises three of these sections 38 corresponding inlength to;

the ladder sections 22, 23 and 24. These sections are pivotally connected as at 38 and are preferably provided with slotsi38 adapted'to engage: overstuds similar to'the studs 3'? detailed in Fig. 4. The scaffold extensions"3'8 are cross braced by a series or" strutspivoted at one end to-one member and? having, a hook engagement 37 at the other. These may be disposed as desired and are arrangedto swing out of the Way when i the sections are collapsed.

The device can be operated as a low scatfolcl".with the" platform 32 as shown in Fig: 5. with the ladder, sections 24 and 23 run down into substantial, coincidence with the section 22. When working at at higher level the section 23 carrying thesect-ion 24; may be run up untilthepl afrnm 32 is at theelevation shown in Fig. 6: The high level is shown in Fig. l and intermediate levels may be; attained by relative positioning of the ladder sections by turning the cranks 25. Asindicated in" dotted lines in Fig. 5', the combined se'ctions may be swung on the pivt-"ll of thesect-ion 22'by simple IOt 0f der or by bending the end sections at? right angles to the center section form a' light st-rnss 0r scafiold independent of the rest of; the device.- I I Various modifications may be made in the detaillstlaictnre;ohtheladder and the scaffold and the operating members and all Without departing from the spirit of my invention.

as set forth in the appended claims.

l' Vhat'I therefore claim and desire to secure by LettersPatent is: V

1. In a scaffold structure, a base, a ladder member comprising aplurality of exten' si'ons', a runged scaffold member comprising a plurality of extensible units, and a platformcarried by the l'ad'der'member at one end, and support-able by the scaffold member and detachable brace members dis- 1osed between the ladder and scafiold mem- 2 In a scaffold structure of the class described, a baseyan extension ladder hinged thereto, means for angularly swinging the ladder, a" foldable scaffold support detachably mounted on said base, a platform carried by the top section of the ladder and having afree end supportable on'thescaflold member.

3; In an extension ladder structure, a plurahty of sections each including; a channeled side member construction, two of said memhers having the flanges of their channels disposed in' the same direction, and an intermediate section having the flanges Off its-said members disposed in an opposite direction and engaging the inner flanges of the first named section,'and achannel hllerpiece carried by the intermediate section and disposed With its channel in the same direction as its main side member, and externally" bearing on the outer face of said included flange members of thefirst named sections.

ason BERMAN,

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