US1727671A - Adjustable scaffold - Google Patents

Description

Sept. 10, 1929. o. P01- T 1,727,671

ADJUSTABLE S CAFFOLD Filed May 24, 1928 2 Sheets-Sheet '1 Sept. 10, 1929. 0, POTT 1,727,671

ADJUST-ABLE lSCAFFOLID 'Filed May 24, 1928 2 Sheets-Sheet 2 Patented Sept. 10, 1929.

UNITED STATES OTTO POTT, F QUINCY, ILLINOIS.

ADJUSTABLE SCAFFOLD.

Application filed May e4, ieee. serial No'. 280,355.

l and adapted to be readilyerected for use or knocked down into compact form for stor age or transportation.'

A still further object is to provide a four-pillar adjustable scaffold, in which the pillars are effectively' connected and braced against swaying when the scaffold is setup for use. c

The invention consists of the novel form, combination and arrangement' of parts hereinafter more fully described, shown inthe accompanying drawings and claimed.

ln the drawings Figure 1 is a side elevational view of a scaffold embodying the present invention. Figure 2 is a top plan view thereof.

Figure 3 is an end elevational view of the saine.

Figure 4L is an enlarged fragmentary detail view of one of the pillars and adjacent parts, partly in elevation and partly in vertical section.

Figure 5 is an enlarged horizontal section through one of the pillars, taken on line 5 5 of Figure l;

Figure 6 is an enlarged fragmentary section on line 6-6 of Figure 2.

Fig. 7 is a detailed sectional view.

Referring more in detail to the drawings, the present scadold embodies four similar extensible corner posts or pillars,

each including a hollow lower section 5 provided with a supporting base, preferably in the form of crossed bars 6 having caster wheels 7 at the ends thereof, and a hollow upper section 8 slidably telescoped in the llower section 5. These pillar sections (are preferably formed of boards bound at the top and bottom by bands or hoops 9 and of rectangular form in cross Asection to prevent relative turning of the pillar sections. Journaled on a horizontal spindle 10 in the upper end of each lower pillar sectionr is a pulley 11, and passing over this pulley is a rope 12 which yhas one end attached to the lower end of the associated upper pillar section 8 asL at 13, and which has its other end attached to the drum of a small windlass which is journaled as at 14 in the lower end of the lower pillar section. The upper pillar section has longitudinal elongated slots '15 in opposite` sides thereof through which the spindle 10 projects for permitting the upper pillar section to be raised or lowered, and in order to promote j the ease of movement of said upper pillar section, pairs of yantifrictionrollers 16 are journaled on opposite sides of the lower end thereof to rideon the inner surfaces of the adjacent walls of the lower pillar section.

The pillars yare separably connected at the ends and sides of the scaffold and held in operative relation to each other by'means of pairs of folding connecting bars 17 sep-` arably connected in any suitable manner at 18 and having releasable braces 19( To prevent spreading.; of the kupper pillar sectionsateach end ofthe scaffold, the upper ends of said sections are connected by detachable connecting chains 20. j

In view of the above, it will be apparent that the erected scaffold may be readily moved on the lioor to thedesired place, after whichthe windlasses 14 may be operated to raise or lower the upper platformsupporting sections 8 of the pillars to suit the height of the work to be done. To hold the upper sections of the pillars in their various vertically adjusted positions, each is provided with a longitudinal series of holes 21 for selective reception of a removable pin 22 whose ends are adapted to project and rest on the upper end of the associated lower pillar section, thus relieving the ropes 12 of 100 the weight imposed on the platform of the scaffold.

The upper ends of the upper pillar sections at each side of the scaffold are connected by a detachable track rail composed of a pair of spaced parallel bars 23 rigidly connected together' as at 24. The upper ends of the pillar sections 8 are bifurcated to receive the track rails, and the legs of the bifurcations are connected by cross pins 25 adapted to seat in undercut notches 26 provided in the lower edges of the bars 23 forming said rails. Due to the undercut forni of the notches 26, the rails are locked to the pillars until the latterA are disconnected at 18 and moved slightly together, thus preventing accidental detachment of the rails when the scadold is properly set up for use.

A platform seat 2.7 is provided for movement on the track rails from end to end of the scaffold, the seat having rollers 28 adapted to ride on the bars 23 of the rails and formed with central flanges 29 to fit between said bars and prevent lateral displacement of the seat oi ofthe track rails,

. Ropes 30 pass around pulleys 3l on the opposite ends of the track rails and have their ends attached to opposite sides ofthe workmans seat or carriage as at 32. It is thus apparent that the workman, while occupying the seat, may readily shift the seatV or carriage horizontally and correspondingly vary his position as the work progresses, by pulling on the intermediate portions of the iopes 30' in thedesired direction.

By separating Vthe barsll' at 18, the pillars may be shifted to permit detachment of the track rails. The bars 17 may kthen be folded andthe pillars collapsed so that the scaifold may be knocked down in compact form for convenient storage or transportation from one place to another.

Minor changes may be made without departing from the spirit and scope of the invention as claimed.

l/Vhat l claim as new is: l. A scaEold of the character described vcomprisingupright corner pillars, horizontal track rails mounted on top of'said pillars, a workmans seat carriage movably mounted on said rails, means operable by the workman while occupying said seat carriage for moving the latter on said track rails, said last-named means embodying pulleys mountedk on the opposite ends of one of said trackrails, and a flexible member passing track rails having undercut notches in their lower edges to receive said cross-pins.

3. A scaffold of the character described comprising upright corner pillars, horizontal track rails mounted on top of said pillars, a workmans seat carriage movably mounted on said rails, said pillars having cross Apins at'the upper ends thereof, said trackrails having undercut notches in their lower edges to receive said cross pins, and pairs of separably connected folding bars carried by said pillars for connecting the latter inset up relation.

l. A .scaffold of the character described comprising upright Vcorner pillars, horizontal track rails mounted ontop of said pillars, a workmans seat carriage movably mounted on said rails, said pillars having cross pins at the upper ends thereof, said track rails having undercut notches in their lower edges to receive 'said cross pins, pairs of separably connected folding bars carried by said pillars for connecting the latter in set up relation, said pillars embodying telescopically associated upper and lower sections, and means to vertically adjust said upper pillar sections for varying the elevationof said track rails, said folding bars being carried by said lower pillar sections.

5. scaffold of the character described comprising upright ycorner pillars, horizontal track rails mounted on top of said pillars, a workinans seat carriage movably mounted on said rails, saidpillars having cross pins at the upper ends thereof, said 100 track rails having undercut notches in their y lower edges to receive said cross pins, pairs of separably connected yfolding' bars carried by said pillars for connecting the latter in set up relation, said pillars embodying tele- 105 scopically associated upper and lower sections, means to vertically adjust said upper sections, said folding bars being carried by said lower pillar sections, said adjusting means embodyingwindlass drums mounted in the lower ends of the lower pillar sections, pulleys mounted in the upper ends of said lower sections, and ropes attached to the lower ends of the upper sect-ions and to the drums and passing over said pulleys.

In testimony whereof I affix my signature.

OTTO POTT.

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