US874362A - Scaffold-jack. - Google Patents

Description

. PATENTED'DEG. 17, 1907. E. D. HUNT A. C. JAMES.

ySGAPPOLD JACK. APPLICATION FILED AUe.\2s.19o7.

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.EDWARD D. l'lUNT AND ALVA U. JAMES, OF MOUNT VICTORY, OHIO; SAID JAMES ASSIGNOR TO CLAUDE M. OSBU-N, OF MOUNT VICTORY, OHIO.

SGAFFLD-JACK.

specisation of Letters Patent.

Patented Dec 1.7, 1997.

Application filed August 26, 1907. Serial No. 390.216.

To all lwhom it may concern:

Be it known that we, EDWARD D. .HUNT and ALVA C. JAMES, citizensof the United States, residing at Mount Victory, in the county of Illardin and State of Ohio, have invented a new and useful Scaiold-Jack, of which the following is a specification.

This invention known as a scaffold jack, is a shifting bracket tobe applied to sloping roofs and sides of buildings for horizontally supporting, in connection withsimilar brackets, scaffold bjoards to contain workmen, their tools and material to work with, such as slate.

The ob ject of the invention is to provide a strong, light and simple scaffold jack, constructed of a few unitary parts joined to' gether by fixed separable hinge pin connections, wliicli enable the jack to be folded in compact form for storing and yet be capable p of application to a slanting or vertical roof,

or a side wall while still in folded condition to be afterward opened out and the scaffold board support adjusted to the proper angle for sustaining the scaffold board in horizontal position.

With this and other objects in view the invention consists 'in certain novel construction, combination and arrangement of parts, hereinafter described and definitely claimed.

Referring to the accompanying drawingsz- Figure 1 is a perspective view of a portion of a slated roof with the inipi'oved scaffold jack applied thereto. `ig. 2 is a plan View of the. invention applied folded to a roof and the manner of removing it shown in dotted lines. Fig. 3 is a side elevation ol' the jack in opened position as when applied to a vertical side or wall. Fig. 4 is a `sectional 'view `on the line 4 4 of Fig. 3. Fig. 5 is a sectional view tahen on the line 5--5 of Fig: 3. Fig. 6 is a sectional View on the line (if-6 of Fig. 2.

Similar numerals of reference are used for designating the same parts on all the iigures.

The jack is made of th'ree hingejointcd pieces, namely, the base strip 1, the board support 2, and the brace 3 for upholding the outer' end of the board support.

The base strip 1 is made of a strip of heavy gage sheet' steel (18 or 20) about thirty eight inches long. The lower portion which su ports the greater part of the weight, will e about six or seven inches wide with upturned 455 side flanges 4, each iiangc having a perforation 5 near its Yupper end, one 6 near its longi0 tudinal center and a plurality of perforations 7 near their lower ends.- The fianges 4 extend up' the base strip about twenty inches leaving the upper fourteen inches perfectly llat to form the nail strap 8 which is only two inches or so wide. Into the left side of the upper end of the nail strap are cut two notches 9 which curve inwardly and then extend straight upwardly for a short distance. 'Two similar notches 10 are formed in the edge on the right side near the lower end of the nail strap as clearly shown in Figs. 1 and 2. Into these notches 9 and '10 nails 11 are driven to secure the ack to the' roof or side of a building.

Hinged between the flanges 4 of the strip 1 by -a in 12 passing through the perforations 5 is t ie scaffold board support 2, made of the saine gage sheet steel as the base strip, and having its inner end turned into a sleeve 13 through which the hinge pin 12 extends. For the purpose of strengthening the boards support 2 its side edges are turned down- Wardl in the shape of semicircular ianges 14 as indicated in Fig. 5.

Thescaffold board support 2 is held in horizontal position, whatever the angle of the base strip 1, by the brace 3 made of sheet steel of the saine gage as the other parts and having its side edges turned inwardly to.

foimflanges 15 which strengthen the brace and give sup )ort to the pivot pin 16 which passes throng i them and through a sleeve 17 on the outer end of Ithe scaffold board support 2. The upper end of the brace 3 projects 'above the support 2 a suilcieiitdistance to form a guard or stop' to prevent the scaffold boards from slipping olf the support. These three main parts, the base strip, support and brace, are so proportioned that when folded, the support 2 lies between the flanges of the brace 3 and those of the base 1, while the brace` 3 folds down over the support and between the flanges 4 of the base strip 1 as` clearly indicated in Fig. 2. The extreme lower endk of the brace 3 is without a flange b ut is turned outwardly to form a foot 18 which is adapted to slide up anddown on the base strip 1 between its flanges 4. Formed on the foot iecelS is a loop 19; a pin 20 is also attache to the foot by a chain 21. IThe angle of the support is adjusted by moving the foot pieces ong thebase strip, and when it has reached a horizontal position the pin 20 is run through the two 4holes 6 or two of those 7 and the loop 19, thus securely holding the parts in fixed relation. A nut may bescrewed on the end of the pin 20 to keep it from being withdrawn, or a cotter pin mayI be used for the same purpose.

` plied row. The upper end of the nail strip projects above the slate and is also fastened y drivin two more nails in the notches 9 lnto the s eathing direct., Another jack is attached in the same way at such a distance from the first as to support the other ends of the scaffold boards. The supports 2 are now raised until they are level and the brace 3 secured by the pin 2() engaging the loop 19 and two of the holes 7. The scaffold board or boards are then put in place on the supports and the scaffold is ready for use.

hould the roof be longer than the scaffold boards, as many more jacks will be employed as are necessary to-fill out the4 length of the roof. The next row ofslates are fastened 1n the usual manner, placing themover the nail strips as they are reached.

Having slated as high as possible a new set of scaffold jacks will be attached at the top row of slates and those previously in use be removed. This is quickly done by removing' the boards, pushing or driving the base strip 1 upwardly until the notchesbecome disengaged from the nails, the jack being drawn to the left towards the end of the movement, as shown in dotted lines in Fig. 2, until it is finally disengaged from the nails. The nail strip is then with-drawn from between the slates. The thickness of the nail strip and of the nail heads are so slight, the presence of the nails under the slates after the jack shave been removed is unappreciable and does not in the least injure the roof. The use of a plurality of nails 'to hold the jack in place prevents any side movement thereof andV l'astens it firmly and securely, yet permitting its ready removal when desired. hen the jack .is to be used on vertical siding it is applied in the saine Way, but the pin 20 is supported in the perforations 6 which holds the support in horizontal position as clearly shown 1n Fig. 3.

Having thus described the invention, what is claimed is 1. .A scaHold jack comprising 'a base strip having an integral nail strip continuouswith the base strip, said nail strip having a plurality of notches'ateach end on opposite sides, a scaffold board support hin ed to said base strip, a brace hinged to sai support and a pin adapted to fasten the lower end of said brace to the base strip at different points.4

2. A scaHold jack com rising a base strip having an integral nai strip continuous therewith said nail strip having a plurality of notches at the lower end of said nail strip through which nails are driven between two slates into the sheathing, and a plurality of notches at its upper end and on `the o pOSte side through which nails are driven irectly into the sheathing above the slates, a scaffold board support, a brace therefor and means for fastening the lower end of said brace to the base strip.4

3. A scaHold jack comprising a flanged base stri a nail strip without iianges continuous engthwise of said body strip and having a plurality of notches on each side, a flange-d scaffold board support hinged between the flanges of said base strip, afianged brace hinged to the outer end of said support and having a foot adapted to slide on the base stripbetween its flanges and means for fastening said brace to 'the flanges of the base strip in different positions.

4.' A scaffold jack comprising a flanged base strip having a nail strip continuous therewith and provided with slots for soeur-- inv it temporarily to a roof by nails driven in said slots, a scaffold board support hinged to the flange of said base strip, a brace hinged to the free end of said support, a foot on the lower end of said support, a loop at the upper end of said foot and a pin adapted to engage one of a series of openings in each of said base flanges and s/aid loop to hold said support in horizontal position.

5. A scaffold jack comprising a base strip having a nail strip continuous therewith provided with a plurality of notches or slots on each edge into which nails areto be driven for temporarily fastening the base strip to the roof whereby side' play is prevented, a

, scaffold board support piyoted to said base strip, a brace pivoted to the end of said support and projecting above it, and means for adjustably attaching the lower end of said brace to the base strip.

In testimony that we claim the foregoing as our own, we have hereto affixed our signatures in the presence of two witnesses.

EDVARD D. HUNT.

- ALVA C. JAMES.-

l/Vitnesses JOHN HoBENsARr, d. WALTER GARNER.

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