US747564A - Portable scaffolding. - Google Patents

Description

No. 747,564. PATENTED DEG. 22, 1903.

J. B. 6L R. MURRAY. PORTABLE SGAFPOLDING. 4 APPLICATION FILED-m3151903. 1m MODEL. s SHEETS-sum1. 1 y?. vf 1 .,254 f 1"":2/ 2a 2f# l`9 /f l /y E fll .f5 l) ,f u y /f .im

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No. 747,564. PATRNTRD DRC. 22, 1903.'v

' J. B. RR. MURRAY.

PORTABLE SGARPOLDING.

- APPLIOTIN FILED JAN. 15,1903.

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' PATENTED DBO. 22, 19.03.v

J. B. & R. MURRAY. PORTABLE SCAFFOLDING.

APPLIoATIoN FILED JAN. 15,1903.

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f r MW @www C0.. PHOTQLITHO., WASHINGTON D C UNITED STATES Patented December 22, 1903.

PATENT )FFICR PORTABLE SCAFFOLDING.

' SPECIFICATION forming part of Letters Patent No. 747,564, dated December 22, 1903.

l Application filed January 15,1903. Serial No. 189,104. (No model.)

enable others skilled in the art to which it appertains to make and use the same.

Our invention has for its object to provide an improved portable scaffolding which may be readily adjusted vertically and in which the working deck or plank is located at the extreme upper ends of the vertical supports.

To this end it consists of the novel devices and combinations of devices hereinafter described, and defined in the claim.

The invention is illustrated in the accompanying drawings,wher ein like characters indicate like 'parts throughout the several views.

Figure 1 is a side elevation of the scaolding. Fig. 2 is an end elevation of the same. Fig. 3 is a plan view of the scaolding with some parts broken away. Fig. 4 is a vertical section on the line :1:4 m4 of Fig. 1. Fig. 5 is a section on the line x5 x5 of Fig. Fig. 6 is a vertical section on the line m6 to of Fig. 4. Fig. 7 is a transverse section on the line m7 m7 of Fig. 4, and Fig. 8 is a view illustrating a modified adjustment of certain parts of the scaffolding.

It may be here stated that our invention involves the use of a pair of vertically-extensible supports-such as extension-'laddershaving devices applied to thefupper ends thereof, whereby they are adapted to rmly support the working platform or plank so that the workman will be above the ladders or vertical supports.

In the drawings the numerals 1 and 2 indicate, respectively', the upper and lower sections of extension-ladders of ordinary construction and provided, respectively, with ordinary guide-brackets 3 and pivoted latchdogs 4. Each extension-ladder is provided with a third extension-section 5, which constitutes an upper end section of the ladder or vertically-adjustable support, but need The sections 5, like the sections 2,are provided with latch-dogs 6 at their lower ends, which engage the rungs of said sections`2 in the same manner as the dogs 4 engage the rungs of the lower sections 1. The ladder-sections 2 are further provided at their upper ends with brackets 7, which engage the bars of the upper sections 5 in the same manner as the brackets 3 engage the sides of the ladder-sections 2. The upper ends of the bars of the section 5 are connected by a bolt 8, and on this bolt between the bars of said section 5 is a spacing-sleeve 9. A roller or wheel 10 is loosely mounted on the intermediate portion of the sleeve 9, and pivoted on the said sleeve is a depending bar 11, the pronged upper ends 12 of which embrace the said roller or Wheel 9. The depending bar 11 is detachably secured to `the prongs 12 by a bolt 13, and the said prongs have outwardly-projecting extensions 12a, to which is rigidly secured an outwardly-projecting horizontalA bar 14. The numeral 15 indicates a strut or trussbar provided at its ends with laterally-spaced straps 15a, detachably connected to the bars 11 and 14 by bolts 16 and 17, respectively.

Thecharacter 18'indicates a supplemental detachable ladder-section formed by a single bar having rung's 18a, which project from the opposite sides thereof. At its lower end the ladder-bar 18 is bifurcated at 19 and is adapted to straddle the lower rung 5 of the laddersection 5 or one of the run'gs of the laddersection 2 for that matter. Near its upper end said ladder-bar is provided with a slot 20, through which and the outer end of the bar 14 a bolt 21 is passed to detachably con- .nect the said parts and permit the ladder 18 a limited vertical movement and to cause the strain from weight placed on the bar 14 to be transmitted through the strut 15 to the depending bar 1,1, and hence thrown in part against the side ofthe wall or the side of the building.

The two extensible ladders or supports above described will of course be spaced apart laterally and will be so adjusted vertically that the horizontal bars 14 of the two ladders will stand in the same horizontal plane. It

is advisable to tie together or brace the two not be provided with a full number of rungs. I

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ladders by means of guy-ropes 22, which are connected thereto and crossed, substantially as indicated by dotted lines in Fig. 1.

The so-called working deck is, as shown, made up of a pair of planks 23, which are overlapped and held together with freedom for sliding adjustments one upon the other by means of loops or endless straps 24, secured one to the end of each plank. The overlapped ends of said planks are provided with perforations 23, which are brought into registration with the planks in different adjustments and through which a bolt or pin may be passed, as best shown in Fig. 5, to hold the said planks in their set adjustments. The platform afforded by the planks 23 is supported by the horizontal bars 14 of the two ladders, and to prevent slipping thereof said bars 14 are provided with pins 26,which work through suitable perforations in the said planks, as best shown in Fig. 4. As is evident, a portable scaffolding constructed as above described may be very quickly applied in working position against the side of a building and may be very quickly adj listed to any desired height or moved from place to place. In adjusting the ladders vertically the rollers or Wheels 9 prevent scratching of the side of the building.

With the device adjusted as shown in Figs. 1, 2, 3, and 4 a workman passing up or down the ladder would of course pass over the supplemental section 18.

The scaffolding is of course serviceable for a great many different purposes. It will be found especially serviceable, however, for use by carpenters and painters. When it is to be used by carpenters, it would usually be adjusted as already described. When, however, the device is to be used by painters, the ladder may be adjusted as shown in Fig. 8. In this adj ustment the depending bars 11 are removed and the depending end of the truss-bar or strut 15 is by means of the bolt 27 directly connected to the sides of the extension-sections 5 of the ladder. This being done, the entire weight on the deck or` plank 23 is thrown directly onto the upper portions of the ladder.

When the device is out of use, the sections of the extension-ladders or extensible sup ports may be slid one upon the other into very compact form, and the plank-sections 23 may be slid one upon the other until they occupy approximately the same space as one of the sections thereof.

The portable scaffolding described is of course capable of modification other than herein specified within the scope of our invention as herein set forth and claimed.

What we claim, and desire to secure by Let- .ters Patent of the United States, is as follows:

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