US331742A - Scaffold-clamp - Google Patents

Description

(No Model.)

T. N. SUBERS.

SGAFFOLD CLAMP.

atented Dec. 1, 1885.

O aw Unrrno STATES arnnrr Darren.

THOMAS N. SUBERS, OF PHILADELPHIA, PENNSYLVANIA.

SCAFFOLD-CLAMP.

SPECIFICATION forming part of Letters Patent No. 331,7:2, dated December 1,1885.

Application filed May 18, 1885.

To ctZZ whom it may concern.-

Be it known that I, THOMAS N. SUBERs, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Scaffold-Clamps, of which the following is a specification.

My invention consists of certain improvements in the scaffold-clamp for which I obtained Letters Patent No. 295,592, dated March 25, 1884, the objects of my present improvements being to simplify the construction of the clamp, to render it more secure, and to make it available for splicing sections of the vertical beams or posts of the scaffold.

In the accompanying drawings, Figure 1 is a perspective view showing the improved clamp used for securing a longitudinal bar or stringer to a vertical beam or post of the scaffold, and also showing a clamp constructed for use as a splice for said post or beam; Fig. 2,a transverse section of post and stringer, showing the bars of the clamp in elevation, and also showing the means of tightening the clamp; Fig. 3, a side view of Fig. 2, looking in the direction of the arrow; Fig. 4, a perspective view of the cam-lever shown in Figs. 2 and 8, and Fig. 5 a view showing a modified plan of carrying out one feature of my invention.

A represents one of the upright posts or beams of a builders scaffold, and B one of the longitudinal bars or stringers of the scaffold for the support of the stretchers of the work in g-platforin. The stringer B bears against the outer face of the post A, and on the outer side of said stringer bears a bar, D, placed diagonally, so that its upper end projects above the stringer B and beyond one side of the post A, the lower end projecting below the stringer B and beyond the opposite side of the post. A similarly-arranged bar, D, bears against the inner face of the post A, and the projecting ends of the two bars are connected by straining-rods F. Each rod F passes through an opening near one end of the bar, D,and has a head bearing against the said bar, the opposite end of the rod passing through and projecting beyond the opposite bar D, and having a series of openings, a, to any one of which may be adapted a pin, 72, whereby the bar D is retained in place against the outer side of the stringer B. The bars D D have inwardly- Serial X0. 165,836. (No InOllCl.l

projecting spurs or pins d, which are thrust into the post and stringer, and prevent the bars from slipping thereon, and in order to insure the firm clamping of the post and stringer between the bars I draw the latter forcibly together by means of the straining-rods and a tightening-lever, G. This lever has a forked head, f, so that it can embrace the strainingrod, and in the back of this forked head of the lever are notches 13, adapted to a fulcrumpin, m,which can be inserted in any available opening of the rod F, so that the front portion, a, of the head of the lever,which is eccentric in respect to the fulcrum-pin, bears against the bar D,whereby when the lever Gis moved in the direction of the arrow, Fig. 2, the bars D D are drawn forcibly together, and the tight clamping of the post and stringer is insured, the bar D being retained in position, when fully tightened, by the insertion of the pin Z) in the opening adjacent to the outer edge, of the bar.

In my former patent the straining-rods F ating-cranks. The objection to this form of strainingrod is, that it can be loosened by mischievcus or evildisposed persons, and the security of the scaffold thereby endangered; moreover, the formation of a crank end or handle on each straining-rod materially in creases the expense of the same.

In the present case the lever G is detached from the straining-rod after the bars have been tightened and retained by the pin 6, so that but one lever is necessary, and there is no likelihood of the loosening of the bars, as in the former case.

Vhen the threaded straining-rod is usedinstead of the perforated straining-rods which I have described, I make the head of said rod square or of other polygonal form, and, preferably, tapered, as shown in Fig. 5, the tightening-lever G in this case having a socket for adaptation to the said head of the strainingrod.

In constructing the device for use as a splice for sections of upright posts or beams of the scaffold, upper and lower clamp-bars, D D or D D, are connected by a central web, J, as shown in Fig. 1, so as to form a single structure, the lower bar of which clamps the lower section and the upper bar the upper section were threaded, and had ends forming oper of the upright. In this case there is a firm hold of the splicing-frames upon the posts by reason of the projecting studs which are formed upon the frames, each clamp-bar being rigidly secured to the opposite bar at each end by the strainingrods F.

I claim as my invention 1. Ascaffold-clamp comprisingtheopposite bars D D,having spurs d,the straining-rods F F, and a tightening-lever, G, detachable from said rods, all substantially as specified.

2. The combination of the opposite bars D D, the straining-rods FF,having perforations a, the tightening-lever G, having a cam, n, and the pins 12, whereby the bars are retained when tightened, as set forth.

3. The tightening-lever having a cam-head and notched in the rear of the head for the reception of a fulcrunrpin, as specified.

4. The-tightening-leverhavingaforked end, 20 forming a cam,and notched in the rear for receiving a fulcrum-pin, as specified.

5. The combination of sp1icing-frames,each comprising upper and lower clamp-bars and a connecting-web, and each having retaining- 2 spurs with straining rods F, whereby the frames are secured together at both ends of each clamp-bar, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two sub- 0 scribing witnesses.

THOMAS N. SUBERS.

Witnesses:

JOHN E. PARKER, HARRY SMITH.

Images