US589573A

US589573A - Work-trestle

Info

Publication number: US589573A
Authority: US
Publication date: 1897-09-07
Anticipated expiration: 1914-09-07

Description

(No Model.) W. A. REARDON.

WORK TRESTLE. No. 589 573. Patented Sept." 7, 1897.

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UNITED STATES PATENT QFFIQEQ WILLIABI ANDREW RARDON, OF PORT LEYDEN, NEW YORK.

WORK-TRESTLE.

SPECIFICATION forming part of Letters Patent No. 589,573, dated September '7', 1897. Application filed April 16, 1897. Serial No. 632,401. (No motlehl T0 to whom it may concern-,-

3e it known that I, WILLIAM ANDREW REARDON, a citizen of the United States, residing at Port Leydemin the county of Lewis and State of New York, have invented certain new and useful Improvements in ork-Trestles, of which the following is a full and complete specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in w0rk-trestles,such as are usually em ployed for supporting scaffolds, platforms, and for other and similar purposes; and the object of the invention is to provide a device of this class which is simple in construction and operation and strong and durable, and which is vertically adjustable and which may also be longitudinallyadjustable, if desired.

lhe'invention is fully disclosed in the following specification,of which the accom pan ying drawings form a part, in which- Figure 1 is a perspective view of my improved trestle; Fig. 2,a plan view of a modified form of top therefor; Fig.3, a similar viewof a modified form of side brace, and Fig. 4 a sec tion on the line at a of Fig. 1.

In the drawings forming part of this specificatiomthe separate parts of my improvement are designated by the same 11 uinerals of reference in each of theviews, and in thepractice of my invention I provide a cross-bar 5, each end of which is provided with a head 6, into which the cross-bar 5 is countersunk, or said cross-bar may be connected with the heads 6 in any desired manner, and formed on or secured to each of the heads 6 is a depending leg 7, which is rectangular in cross section and the sides of which are provided with shoulders or projections S, which are formed therein in any desired manner, and I also provide supplemental legs 9, two of which are employedin connection with each of thelegs '7, and. these legs are provided attheir upper ends with shoulders or projections 10, which correspond with the shoulders or projections S on thelegs 7, and the shoulders or projections 10 on. the supplemental legs 9 are adapted to operate in connection with the shoulders or projections S on the legs '7.

The upper ends of the supplemental legs 9 are connected by clamp-heads 11, which are rectangular in cross-section and which are of theform and construction shown in Figs. 1 and t. The said clam p'heads are wider at their lower than at their upper sides, and each is composed of two separate parts 12 and l3,said parts being yoke -shaped in form and the sides of one being adapted to inclose the sides of thctother, and formed in the sides of one of said parts are longitudinally-inclined slots 14, at each end of which is a downwardly-directed extension 15, and formed on or secured to the opposite sides of the other part arelugs or projections 1G,which pass through and are adapted to move in the slots 14.

The clamp-heads 11 are designed to hold the upper ends of the supplemental legs 9 and are placed thereover, as clearly shown inFig. l, and the supplemental legs 9 project outwardly and downwardly at each side of the legs 7, and the lower ends of the legs 7 are provided with transverse guides 13, which are secured thereto and which move up'and down therewith, the ends of the guides 18projectingbeyond the supplemental legs 9.

One or both of the legs 9 at each end of the trestle is also provided with a clasp or keeper which is secured thereto and upon which the clamp-heads 11 rest, and connected with the outersides of the clamp-heads 11, or to one of the parts thereof, is a'set-screw 20, which moves in a vertical groove 23, formed on the outer sides of the legs 7.

Securedv to the cross-bar 5 of the trestle are brace-rods 24,- which project downwardly and outwardly, and the lower ends of which are pivotally connected with the lower portions of the legs 7, as shown at 25, and the legs 9 at each end of the trestle are also connected by horizontal brace-bars 26, which are preferably detachable, but may be pivoted at one end.

As thus constructed it will be apparent that by properly manipulating the several parts of the clamp-heads 11 the cross-bar 5 of the trestle may be raised or vertically adjusted whenever desired,it being u nderstood that-the legs 7 are raised therewith and pass between the upper ends of the supplemental legs 9,

and said parts may be locked in any desired position by means of the clamp-heads 11.

In Fig. 2 I have shown a modified form of construction in which the bar 5 is composed of two separate parts, which are connected by cross-pins or bolts 27, and in Fig. 3 I have provided with braces which extend downshown one of the horizontal bars 26, which is formed in a similar manner, said braccbar being composed of two separate parts, which are connected by belts or screws 28, and when these forms of construction are employed it will be understood that the separate parts of the trestle are longitudinally adjustable.

The legs 7 may be of any desired length, as may also the supplemental legs 9, and it will be apparent that my improved trestle may be composed of any desired material, and it will thus be seen that I accomplish the object of my invention by means of a device which is simple in construction and operation and well adapted to produce the result for which it is intended.

Having fully described my invention, I claim as new and desire to secure by Letters Patent 1. The herein-described trestle, which consists of a horizontal top bar, theends of which are provided with depending legs on the opposite sides of which are formed shoulders or projections, and each of said legs being also provided with two supplemental legs which are provided at their upper ends with corresponding shoulders or projections, and said supplemental legs being held together at their upper ends by adjustable clamp heads, through which the depending legs of the top bar pass, whereby the legs of the top bar are vertically adjustable between the-supplemental legs, and said supplemental legs being directed outwardly and downwardly and provided with cross-braces, and the top bar being wardly, and are connected with the lower ends of the depending legs which are formed on or secured to said top bar, substantially as shown and described.

2. The herein-described trestle, which consists of ahorizontal top bar, the ends of which are provided with depending legs on the opposite sides of which are formed shoulders or projections, and each of said legs being also provided with two supplemental legs which are provided at their upper ends with corresponding shoulders or projections, and said supplemental legs being held together at the upper ends by adjustable clamp heads. through which the depending legs of the top bar pass, whereby the legs of the top bar are vertically adjustable between the supplemental legs, and said supplemental legs being directed outwardly and downwardly and provided with cross-braces, and the top bar being provided with braces which extend downwardly, and are connected with the lower ends of the depending legs which are formed on or secured to said top bar, said top bar being longitudinally adjustable, substantially as shown and described.

In testimony that I claim the foregoing as my invention Ihave signed my name, in presence of the subscribing witnesses, this 10th day of April, 1897.

WILLIAM ANDRE W REA R DON.

Witnesses:

JAMES JORDAN,

II. SAWYER.