US694230A - Scaffold-bracket. - Google Patents

Description

'No. 694,230. Patented Feb. 25, I902.

w-. E. ARNOLD.

SCAFFOLD BRACKET.

(Appl t man 7 1901 (No Model.)

UNITED STATES PATENT O EICE.

WILLIAM ARNOLD, OF DALLAS, TEXAS.

SCAFFOLD-BRACKET.

$PECIFICATION forming part of Letters Patent No. 694,230, dated February 25, 1902. Application filed December '7, 1901. Serial No. 85,062. (No model.)

T0 to whom it may concern:

Be it known that I, WILLIAM E. ARNOLD, a citizen of the United States, residing at Dallas, in the county of Dallas and State of Texas, have invented certain new and useful Improvements in Scafiold-Brackets; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in scaffold-brackets and the like, and has among its objects to provide such a device to be used during the construction of roofs that will facilitate the setting up and removal of the temporary scaffolding, such as is commonly employed during the shingling of roofs having a considerable fall or incline.

My invention also provides a device which is more efficient in its action, so'much so as to prevent the slipping of the device while in position upon the roof. The greater the strain exerted upon the bracket the greater will be its holding powers.

Other features of novelty and advantages will appear upon reference to the accompanying drawings, in which-'- Figure 1 is a perspective view looking down upon the device; and Fig. 2 is a side elevation, partly in section, of the device in the position it will occupy when in place upon the roof.

A represents the body or hook portion of the bracket, having one end preferably tapered and pointed to facilitate its insertion beneath the shingle. The opposite end of this portion A is bent back upon itself and is provided with the downwardlyprojecting toothed or serrated jaw B. The material of which this portion of the bracket is made is preferably such as to cause the toothed jaw B to normally tend to spring outward and away from theportion A.

Secured to the body portion A, as by the rivet G, is a yoke D. The bent portion of the member A passes between the upwardly-extending sides of this yoke. Mounted in this yoke D above the bent portion of the member A is a pivoted member E, adapted to swing about the pivot F. This member E is provided with a cam-shaped abutment G adjacent to the pivot-pin F, and said pivot-pin F and abutment G are so located that when the member E occupies the position shown in full lines in Fig. 2 the jaws B of the member A are clamped tightly into the shingle X, and the claws of the toothed extension H are firmly embedded into the side of the lower shingle Y. The sides of this member E are provided with the two parallel upwardly -extending sides I I, between which is adapted to be inserted the cross-bar of the scaffold. Now it will be obvious that as the weight upon the clamp is increased the claws H, carried by the member E, will embed themselves more deeply into the lower shingle Y, which, reinforced by the clamping-jaws B, embedded in the upper shingle X, will minimize any tendency to slipping. When the member E is swung over into the position indicated by the dotted lines in Fig. 2, the claws of the portion H will free themselves from the lower shingle Y, and as the flat side of the cam G will rest upon the bent portion of the member A the teeth B will be drawn out of the upper shingle X, the bracket then being free to be removed. When the bracket has been re placed, the member E is swung back into po-' sition until the claws upon the member H engage the lower shingle Y, the claws upon the memberH sinking into the shingle Y as weight is brought to bear upon the pivoted member E, the teeth 13, when the pivoted member E is in this position, firmly clamping the upper shingle X against the lower pointed portion of the member A.

While this bracket, as before stated, may be quickly removed, yet when in position upon the roof it not only engages with the upper row of shingles, but at the same time engages the lower row of shingles in such manner that should one set of grippers fail the remaining grippers will perform their function, which not only guards against accident, but also gives a much firmer hold upon the roof.

In practice these brackets are generally used in pairs, and the two brackets are connected by'the cross-bar of the scaffold in the wellknown manner.

While I have shown my invention as embodied in one particular form, it will be understood that I do not limit myself to the particular form shown and described, as many changes might suggest themselves to any one skilled in the art, which changes might be made by me without departing from the spirit of my invention.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is

1. In a scaffold-bracket, the combination with a member provided upon one end with a bent-over portion, and a yoke carried by said member; of a pivoted member mounted in said yoke, having a portion adapted to bear upon said bent-over portion, and claws provided upon one end of said pivoted member, substantially as described.

2. In a scaifold-bracket, the combination with a stationary member, a bent-over portion provided upon said member, provided with a toothed jaw upon its free end, and ayoke carried by said member; of a swinging member mounted in said yoke, said member being so mounted as to raise and lower said jaw when operated, and claws carried by said swinging member, substantially as described.

3. Inv a scaffold-bracket, the combination with astationary member, a bent-overportion carried by said stationary member, a toothed jaw carried by said portion, and a yoke carried by said member; of a swinging member pivotally mounted in said yoke, a cam-shaped portion carried by said swinging member adapted to bear upon said bent portion to raise and lower said jaw, and claws carried upon the free end of said swinging member, substantially as described.

4. In a scaffold-bracket, the combination with a stationary member pointed at one end, a bent-over portion upon its other end provided with a toothed jaw, and a yoke carried by said member; of a swinging member pivotally mounted in said yoke, in such manner as to raise and lower said toothed jaw when the same is actuated, the said swinging memher being provided with a recess to receive a portion of the scaffolding, and claws carried upon the free end of said swinging member, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

YVILLI AM E. ARNOLD.

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