US831375A

US831375A - Scaffold-bracket.

Info

Publication number: US831375A
Application number: US31619006A
Authority: US
Inventors: Frank L Polak
Original assignee: Individual
Current assignee: Individual
Priority date: 1906-05-10
Filing date: 1906-05-10
Publication date: 1906-09-18
Anticipated expiration: 1923-09-18

Description

No. 881,375. PATENTED SEPT.18, 190s. P.L.POLAK.

' SCAFFOLD BRACKET. ,APPLIOATION FILED MAY 10,1906.

us mmms PETERS 420., wasumaruu, 04 c FRANK L. POLAK, OF GLENCOE, MINNESOTA.

' SGAFFOLD-BRACKET.

Specification of; Letters Patent.

Patented Sept. 18 1906.

Application filed May 10,1906- Serial No. 1

To all whom it may concern: 1 I

Be it known that I, FRANK L. POLAK, of Glencoe, McLeod county, Minnesota, have invented certain new and useful Improvements in Scaffold-Brackets, of which the following is a specification.

My invention relates to a scaffold-supporting means; and the object of the'invention is to provide a support capable of attachment to a ladder or scantling and adapted to be adjusted thereon to permit the convenient up-and-down movement of the scaffold or staging;

A further object is to provide a bracket or support of simple but strong anddurable construction and one which can be easily attached to a ladder or scantling and as readily removed.

The invention consist generally in the various constructions and combinations, all as hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure 1 is a front elevation of a staging or scafioldwith my invention applied thereto. Fig. 2 is a side elevation of the same, showing the supporting-ladder resting a ainst the building. Fig. 3 is a detail view illustrating the manner of mounting the bracket on the ladder. Fig. 4 is a sectional view on a line m x of Fig. 3.

In the drawings, 2 represents an ordinary ladder, and 3 the staging or scaffolding plank, whereon the workmen stand while employed on the building.

4 is a semicircular band, preferably of angle iron, having its ends connected by a similar bar 5.

6 is a threaded bolt having a locking handwheel 7 at one end and a jaw 8 at its opposite end. A movable jaw 9 is slidable on the bolt 6, and adjustment ofthe locking hand-wheel will serve to clamp the ladder-rail between the fixed jaw 8 and the movable jaw 9. A cam 10 is pivoted on the bolt 6 near the fixed jaw and adapted to engage the edge of the rail and form a positively-acting convenient.

means for clamping the jaws on the ladderrail and locking them against movement thereon; the proper degree of force with which the aws clamp the rail being pre viously determined by the adjustment of the lockin hand-wheel;

A clip 11 is centrally secured to the bar 5 and pivoted at 12 on the movable jaw 9.

This-clip has a-loop 13,- to which the sling or tackle device for raising and lowering the staging is attached, the tackle-block being secured to the upper end of the ladder, as indicated in Fig. 1. Upon-the bar 5 the staging-planks 3- are placed and held by a suitable stop 15 and by a hinged clip 16, having a thumb-screw 17.- The planks will be located on-both sides of the ladder inconven-' ient position for the painter orcarpenter to have access to the wall or cornice of the building.v When working near the ground, the portion of the staging between the ladder and the building will ordinarily be used; but as the staging is raised and is moved nearer the building-wall the workmen in some instanceswill find it more convenient to use the outer plank as asupport. For the purpose of tilting the staging-bracket on its pivot at an angle to the verticalpla'ne of the building I provide a second threaded bolt, corresponding to the one described and having a fixed jaw to engage the ladder-rail and a locking hand-wheel and also provided with a movable jaw 18, on which a guide 19 for one flange of the band 4 is mounted. A series of holes 20 are provided in the band, and a pin 21 fits a hole in the guide and is adapted to slip through one of the holes in the band for the purpose of locking the swinging or tilting scaffold-bracket at any desired angle with respect to the work. Whenever desired, the locking hand wheels may be loosened and the cam lever operated to allow vertical adjustment of the bracket on the ladder to raise or lower the scaffold.

Generally, as shown, two ladders will be provided, with one bracket on each ladder, the jaws of the clamping devices gripping the edges of the ladder-rails, but having a sufiicient space between them, as indicated .in Fig. 2, to allow the bracket to be moved vertically and clear the ladder-rungs. In place of ladders ordinary scantlings may be employed as a support for the brackets.

I do not wish in this application to be confined to any particular size of the scaffoldbracket or to the particular means employed for clamping on the ladder-rail, as the same will be found capable of various modifica tions.

My invention consists, essentially, in the vertical adjustable bracket and a means for tilting it at different angles with respect to the vertical plane of the building.

I claim as my invention- 1. The combination, with a ladder-rail, of a scafiold-bracket segmental in form and arranged in a plane substantially at right angles to the plane of the ladder, said bracket having a bar corresponding to the chord of the segment and forming a rest for the scaffold-planks, means pivotally securing said ing a pivotal connection with one of said clamping-j aws and an adjustable connection with the other jaws for'the purpose specified.

3. The combination, with a supportingrail of clamping devices vertically adjustable thereon, a tackle or sling connecting said clamping devices with a fixed support above, and a segmental bracket arranged substantially at right angles to the vertical plane of said rail having a central connection with said clamping device and adjustable vertically therewith and forming a support on both sides of said rail for the staging-plank, substantially as described.

4. The combination, with a supportingrail, of a staging or scafiolding bracket arranged substantially at right angles to the vertical plane of the rail and supporting the staging-plank on both sides thereof, clamping-jaws provided on said rail and adjustable vertically thereon, a cam-lever for locking or releasing said jaws, means connecting said jaws with said bracket and a tackle or sling connecting said jaws with a higher fixed support, substantially as described.

5; The combination, with a supporting-rail, of clam ing-jaws arranged in pairs thereon, a scafio d-bracket segmental in form having a bar corresponding to the chord of the segment pivoted centrally to the upper of said clamping-jaws and arranged in a plane substantially at right angles to the plane of said rail and supporting the staging-plank, and said lower jaws having a guide wherein the arc of said segmental bracket is slidable, and means for locking said are in said guide.

In witness whereof I have hereunto set my hand this 7th day of May, 1906. v

FRANK L. POLAK. Witnesses:

C. M. TIFFT, FRED ZIMMERMANN.