Improvements in Trestles.
Year: 1891

page_text: Date of Application, 3rd Nov., 1891-Accepted, 5th Dec., 1891
COMPLETE SPECIFICATION.
Improvements in Trestles.
I, THOMAS JAMES PECK of Ballston Spa, in the County of Saratoga, and
State of New York, United States of America, Machinist, do hereby declare the
nature of this invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:―
The object of my invention is to provide an adjustable trestle or horse for the
use of carpenters, masons, and others, for supporting work or scaffolds at any
desired height between two feet to four feet without the use of blocking.
My invention consists in the construction and arrangement of parts as will be
hereinafter more fully described.
Reference is to be had to the accompanying drawings, forming part of this
Specification wherein.
Figure 1 is a vertical transverse section of my improved trestle.
Figure 2 is a side elevation, shewing one position of the upper part of the
trestle in dotted lines;
Figure 3 is a vertical transverse section taken on line - in Figure 2;
Figure 4 is a vertical section taken through the grip; and
Figure 5 is a perspective view of the grip.
Similar letters of reference indicate corresponding parts in all the views.
In carrying out my invention, I preferably form the body of the trestle of cast
iron, wrought iron pipe and channel iron, but I do not limit or confine myself to
any particular material.
The main part of the body of the trestle is formed of a bar A, of channel iron.
To opposite ends of the bar A are attached castings B, which are provided with
shoes a for embracing the edges of the bar A, with sockets, into which are
screwed the pipe legs c, and with a central sleeve d, for receiving the pipes e of the
cross beam C. In the said beam C are inserted internally threaded sockets f, into
which are screwed the upper ends of the pipes e.
The sleeves d are cut away or cored out to receive the friction grips D, through
which the pipes e pass. Each grip is provided with an arm g, which extends
through a mortise in the sleeve d, and enters a slot of the split eccentric E which is
pivoted to it. The eccentric E is provided with a lever handle h, and bears against
the sleeve d so as to clamp the pipe e firmly in the sleeve. The grip is loosened by
lifting the lever of the eccentric, when the cross beam C may be raised, as shown
in dotted lines in Figure 2.
By pressing down the levers in the manner previously described, the grips are
operated so as to clamp the movable part of the trestle in any desired position.
Having now particularly described and ascertained the nature of my said
nvention, and in what manner the same is to be performed, I declare that what
I claim is:
1. A carpenters' trestle, comprising a bar or body provided with supporting legs,
vertical passages or sleeves at the ends of the body open at one side and apertured
at the other, tubular friction grips D inserted through said open sides and provided
with lugs or arms projecting through said apertures, and the cam levers pivoted to
said lugs or arms, and the upper movable section having depending standards
extending down through said passages or sleeves and tubular grips, substantially as
et forth.
2. A carpenters' trestle, comprising the bar or body provided at its ends with
castings B formed with leg sockets and intermediate vertical sleeves, the supporting
egs entering said sockets movably at their upper ends, and the upper vertically

page_text: movable section or beam having sockets registering with said sleeves, standards
removably mounted at their upper ends in said sockets and extending down through
said sleeves, and means for securing said standards at any desired height, sub-
stantially as set forth.
3. A carpenters' trestle, comprising the body or bar A, channeled longitudinally
along its upper face, and apertured near its ends, the castings B, on which said bar
or body rests and provided with a central vertical sleeve registering with said
apertures, cut away on one side and apertured oppositely thereto, the screw
threaded sockets bbat opposite sides of said sleeves, the tubular friction grips D
passed into the sleeves through their open sides and having lugs or arins g
extending through the sleeve apertures, cam levers pivoted to the ends of said lugs
or arms, the legs screwed at their upper ends into said sockets, the beam C resting
in the said channel and having end sockets f, in its lower face in alignment with
the apertures in the channeled bar, and the standards screwed at their upper ends
into said sockets, and extending down through the sleeves and tubular grips,
substantially as set forth.
Dated this 3rd day of November 1891.
By A. M. & Wm. Clark,
T. J. PECK.
53, Chancery Lane, London, Chartered Patent Agents.