US1138838A - Trestle-scaffold. - Google Patents

Description

G. BONENBERGER.

TRESTLE SCAFFOLD.

APPLICATION- msn APR. 15, 1913.

l l m I Patented May 11, 1915.

2 SHEETS-SHEET I- /4 Snow W01,

q qmiflaoow I & an. @g r 3 G.v BONENBERGER.

TRESTLE SCAFFOLD.

APPLICATIQN map APR. 15, 1913.

l ma asg, v I Patented May 11, 1 915. V

2 SHEETSSHEET 2- UNITED STATES PATENT OFFICE.

GEORGE BONENBERGER, OF EVANSVILLE, INDIANA, ASSIGNOR T0 STEEL SCAFFOLDING- 9 COMPANY, OF EVANSVILLE, INDIANA, A. CORPORATION OF INDIANA.

TRESTLE-SCAFFOLD.

Specification of Letters Patent.

Patented May 11, 1915.

Application filed April 15, 1913. Serial No. 761,214.

To all whom it may concern Be it known that I, GEORGE BONENBERGER, a citizen of the United States, residing at Evansville, county of Vanderburg, and State of Indiana, have invented certain new and useful Improvements .in Trestle-Scaffolds, of which the following is a specification. i

This invention relates to trestle scaffolds.

My object is to provide a trestle scaffold of improved construction, adapted for use by brick layers, carpenters, mechanics and others, which will be light, simple, strong and inexpensive and may be taken down or put up with ease.

Another object is to provide a scaffold of the class set forth which will be of unitary construction, whereby successive scaflold units may be added, from time to time as desired, to increase the height of the scaffold, each unit being complete.

The invention has for another object the provision of a unitary scafi'old wherein the units are adapted for connection together in an improved manner.

The invention consists, first, in a trestle scaffold which has horizontal members combined with uprights in an improved mantained and adapted for addition to each.

other; fifth, in the provision of aunitary scaffold, the units of which are complete and have improved means whereby they may be added to each other; sixth, in the general improved scaffold hereinafter set forth.

In the accompanying drawings Figure 1 is a perspective of a complete section or unit of the scaifold; Fig. 2, a detail yiew of one of the uprights; Fig. 3, a similar view of one of the braces; Fig. 4, a detail of one of the clamping hooks; and Fig. 5, a perspective of two of the scaffold units connected together.

Referring first to Fig. 1, the horizontal members 1 are of wood, pieces of plank being used. The uprights 2 are of angle iron and are provided with rows of holes 3. and 4 for the accommodation ofthe shanks of the clamping screws 5 and the brace clamps- 6, respectively.

The hook clamps 5 have points 7 which are adapted to enter the wooden members. 1,

'therebyinsuring against any slippage of the vided thereon handles 10 by which the hook clamps can be tightened. The holes 3 and 4 also provide for the accommodation of straps 11 of the handled brace clamps 6 which are in all respects similar to the' clamps 5, and by which wooden crossed braces 12, which connect the end parts of the scaffold, are secure to the uprights. The points of the clamps engage the braces 12 and these clamps provide for engagement of the braces 12 at difl'erent points thereof, permitting the end parts or uprights of the scaffold to be adjusted toward or away from each other.

Referring to Fig. 3, angle iron braces 13 are adapted to be interposed between the members 1 and they have at their opposite ends hook clamps 14 which are in all respects similar to the hook clamps 5 and are connected to the braces 13 in the same manner. The braces 13 are longer than the uprights 2 and are arranged diagonally there- 'of, the hook clamps 14 being engaged with the members 1, additional support being thus afforded to the upper members 1 and rigidity of the end parts of the scaffold insured.

The scafi'old is complete, as shown in Fig. 1, save that planks or a platform will be laid on the upper members 1 for the-brick layer, carpenter or' mechanic to stand on.

The scaffold can be readily knocked down or taken apart by releasing the different clamps and all of the parts being straight, it can be packed into very compact arrangement. Adjustment being provided, the end parts of the scaffold may be moved toward or away from each other and the height of be extended to any desired height, as shown in Fig. 5, the lower un'it being shown at A and the upper one at. B. Each unit is of the construction hereinbefore set forth except that there is but one upper horizontal member 1 provided between the sections.

The respective braces 13 are arranged so that they form-a truss for the uprights of the respective sections A and B. The-planks or platform will be supported by the uppermost member 1. As occasion arises for a scaffold of greater height, additional complete sections, such as shown in Fig. 1, will be added.

The provision of clamps on the uprights and inclined braces combined with the horizontal members with which said clamps are engaged, permits the lower scaffold or end frames to be built any width desired to af- 5 ford the proper base for the ultimate height of the scaffold, while the upper or imposed frames may be drawn in to such narrower widths or pushed out to such wider widths as the workmen may desire to meet their requirements.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A multiple unit scaffold composed of superposed end frames or trestles, each comprising horizontal members, and uprights having clamps near their ends, the intermediate horizontal members constituting a common connecting means with which the clamps of the uprights of upper and lower end frames are engaged, said clamps affording means whereby the uprights may be set at any desired points lengthwise of the common horizontal connecting members.

2. A multiple unit scaffold composed of superposed end frames or trestles, each comprising horizontal members, and uprightshaving clamps near their ends, the intermediate horizontal members with which the clamps of the uprights of upper and lower end frames are engaged constituting a mmon and the sole connecting means bet en the uprights of the end frames, said clamps affording means whereby the uprights may be set at any desired points lengthwise of the common horizontal connecting members.

3. A multiple unit scaffold composed of superposed end frames or trestles, each comprising horizontal members, uprights having clamps near their ends, the intermediate horizontal members with which the clamps of the uprights of upper and lower end frames are engaged constituting a common and the soleconnecting means between the uprights of the end frames, said clamps affording means whereby the uprights may be set at any desired points lengthwise of the common horizontal connecting members, and inclined braces having clamps engaged with the horizontal members and adapted to be set at any desired points of the length of said horizontal members. I

4. A multiple unit scaffold composed of end frames or trestles each comprising uprights having clamps near their ends, and horizontal members of a vertical dimension greater than the distance of said clamps from the ends of said uprights so that a por tion of the horizontal member is vertically beyond the end of certain of the uprights and engageable by the clamps at the ends of a superposed series of uprights either in line with, or offset from, the others, and inclined braces having clamps near their upper and lower ends detachably connecting them to the horizontal members of the end frames similarly to the connection of the uprights above defined.

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

GEORGE BONENBERGER. ,Witnesses:

J. R. GOODWIN,

F.- C. GORE.

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