US763884A - Scaffold. - Google Patents

Description

PATENTED JUNE 28, 1904.

L. H. & T. H. HARPIN.

SOAPFOLD.

APPLIOATION FILED APR. 9, 1904.

2 SHEETS-SHEET 1.

H0 MODEL.

nvznl ow TH: Noam mus co. PHOTO-LITHQ, wnsnmmuu. 0.1:.

Patented June 28, 1904.

UNITED STATES PATENT OEEIcE.

LOUIS H. HARPIN AND THEOPHILE H. HARPIN, OF KANKAKEE, ILLINOIS.

SCAFFOLD.

SPECIFICATION forming part of Letters Patent No. 763,884, dated June .28, 1904.

Application filed April 9, 1904. Serial No. ZOZAIG. (No model.)

1'0 all whom it may concern:

Be it known that we, LOUIS H. HARPIN and THEOPHILE H. HARPIN, citizens of the United States, residing at Kankakee, in the county of Kankakee and State of Illinois, have invented certain new and useful Improvements in scaffolds, of which the following is a speciplatform.

For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction of the means for effecting the result reference is to be had to the following description and drawings hereto attached.

While the essential and characteristic features of the invention are susceptible of modification, still the preferred embodiment of the invention is illustrated in the accompanying drawings, in which Figure 1 is a perspective View of a staging embodying the invention. Fig. 2 is a side view thereof, showing the platform in section. Fig. 3 is a detail view of the Windlass, its frame, and adjunctive parts,showing the platform or stage in section. Fig. 4 is a detail perspective view of the spacing and steadying device applied to the platform or stage.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The scafi'old or staging comprises standards A, a platform or stage 1, and hoisting and adjusting tackle. The standards A are of similar construction, each comprising a base 2 and a pole 3, the latter being slidable and adjustable with reference to the base and provided near its upper end with a link 1, to

5 which the upper end of the hoisting-rope is attached. The base 2 comprises side members or bars oppositely inclined and connected by cross-pieces 6 and strengthened by bracerods 7, running from one side to the other and crossing intermediate of the transverse ties 6. The pole 3 is slidable between the side members or bars of the base 2 and is held from lateral displacement by means of the upper cross pieces or ties 6 and blocks 8, secured to the inner'faces of the side bars. A sheave-pulley'9 is provided at the lower end of the pole 3. An operating rope or cord 10 is secured at oneend to a side bar and passes around the sheave-pulley 9, thence over a guide-pulley 11,fitted to the opposite side bar, and extends within convenient reach of the ground and is adapted to be made fast to a cross piece or hitch 12. A loopor keeper 13 is applied to the lower cross piece or tie 6 and receives the lower end of the pole 3 when the latter is telescoped into the base 2.

The platform. or stage 1 is provided near each endwith a Windlass and a'spacing and steadying device. The Windlass is indicated at 14c and is journaled to the side members of afrarne 15 of, approximately U form. A gearwheel 16 is secured to the projecting end of the shaft supporting the Windlass 14 and is in mesh with a pinion 17, secured to a shaft 18, journaled .to the side members of the frame 15 and provided with a ratchet-wheel 19, with which a pawl 20 cooperates to hold the windlass against backward rotation, thereby preventing the rope 5 unwinding therefrom, so as to hold the platform or stage 1 at the required elevation. A crank 21 is fitted to each end of the shaft 18 for convenience of operation when it is required to raise or lower the platform. An arm 22 projects from the upper cross-piece of the frame 15 and is apertured for the rope 5 to pass through, thereby holding said rope central and preventing tilting of the platform to one side or the other. A jaw 23 is secured to the lower end of a side member of the frame 15, and a companion jaw 24 is attached to an'arm 25, pivoted at its upper end to the opposite side member at 26. A

band 27 is slidable upon the arm and overlaps a portion of the side member of the frame 15 and is adapted to hold the arm 25 rigid when the platform or stage 1 is received between the jaws 23 and 24. The jaws 23 and 24 are of similar formation, being lengths of angle-bars which have a wing underlapping the platform and a wing engaging with the edge of said platform.

After the standards have been placed against the side of the wall and the ropes 5 are hooked or otherwise attached to the loops 1 and the platform or stage connected to the frames the latter may be elevated to the desired position by operating the shafts 18, which will effect a corresponding rotation of the windlass, so as either to wind the rope thereon to elevate the platform or unwind the rope therefrom to lower the platform. When the platform has been moved to the required position, it is made secure by engaging the pawl with the teeth of the ratchet-wheels 19.

The means for spacing and steadying the platform comprise clips 28, toggle- links 29 and 30, and rests 31. The clips 28are of like formation, each consisting of a clamp 32, having spaced ears 33, between which the ends of the respective toggle- levers 29 and 30 are pivoted. The binding screw 34, threaded into a member of the clamp, is provided with a crank for convenience of manipulation. The clamp is secured to the edge portion of the platform or stage 1 in the well-known manner, and by varying the space between the clips 28 of each spacing device the rest 31 may be projected to a greater or less distance from the edge of the platform, so as to hold the latter a corresponding distance away from the wall to be reached. The rest 31 consists of a vertical bar and extends above and below the plane of the toggle- links 29 and 30, so as to hold the platform steady and prevent any possible tilting thereof even though a preponderance of weight should come upon one side or the otherof a' longitudinal medial line.

Having thus described the invention, what is claimed as new is* 1. In staging, the combination of a platform, a frame comprising side members, ajaw attached to one of said side members, an arm pivoted to the opposite side member and provided with a companion jaw, and means for securing the pivoted arm to hold the jaws in engagement with the platform, substantially as set forth.

2. In staging, and in combination with the platform and suspending means therefor, a vertically-disposed rest, toggle-links having the rest attached thereto, and means for adjustably connecting the toggle-links to the platform, substantially as set forth. v

3. In staging, and in combination with the platform and suspending means therefor, clips .having adjustable connection with the platoted to said. ears, and a rest connected to the.

toggle-links and projected from opposite sides of the plane thereof,substantially as specified. In testimony whereof we afliX our signatures in presence of two witnesses.

LOUIS H. IIARIIN. 'IIIEOPHILE H. HARPIN.

[11. s] [i.. s] I/Vitnesses:

EMILE GONDREAU,

J. H. MERRILL.

Images