Apparatus for Bending or Welding Pipe
Year: 1899

page_text: Date of Application, 4th Apr., 1899 -Accepted, 6th May, 1899
COMPLETE SPECIFICATION.
Apparatus for Bending or Welding Pipe
I, THOMAS JOSEPH BRAY, Superintendent of Tube Works, residing at No. 1761,
Second Avenue, in the City of Pittsburg, County of Allegheny, State of Penn-
sylvania, United States of America, 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 invention described herein relates to certain improvements in draw benches
for the manufacture of pipe, and has for its object a construction wherein a portion
of the bench at its rear end and the sprocket wheel for driving the draft chain are
stationary as against lateral movement, while the forward portion of the bench,
carrying the bell-holder and the guides for the draft chain, is laterally adjustable,
so that such forward portion of the bench may be shifted into such relation to any
one of a number of skelps arranged in heating furnace, that such skelp may be
drawn from the furnace through a bending or welding die or bell without any
material lateral movement of such skelp.
The invention is hereinafter more fully described and claimed.
In the accompanying drawings forming a part of this specification, Fig. 1 is
a top plan view of my improved draw bench; Fig. 2 is a transverse sectional
elevation of the same, the plane of section being indicated by the line II-II,
Fig. 1; Fig. 3 is a side elevation of the bench, and Figs. 4 and 5 are enlarged
plan and sectional elevations, respectively, of the rear portion of the bench.
In the practice of my invention the rear portion 1 of the bench is secured upon
the stationary post or standard 2, while the front portion 3 of the bench is secured
upon standards +, which are provided at their lower ends with rollers 5, thereby
of the bench. This
permitting of the lateral movement of the front portion
front portion is pivotally connected to the stationary rear portion by a rule joint,
as clearly shown in Figs. 4 and 5.
On the upper face of the portion 3 of the bench are formed ribs 6, which are
approximately parallel except at the rear end of the front section, where they
diverge, the amount of divergence being dependent upon the range or length of
lateral movement of the section. When the front section is in middle position,
the diverging ends of the ribs 6 are in line, or approximately in line, with
ribs 6, on the stationary section 1. The ribs 6 and form guides for the draft
chain, which passes around the laterally stationary sprocket wheel S, on the
power shaft 9, and over the guide pulleys 10 and 11, which are mounted on the
stationary and movable bench sections, respectively, in such manner that their
peripheries will project up between the ribs 6, 6". The return portion of the draft
chain is supported by the grooved idlers 12, which are mounted on the supporting
standards 4.
The lateral movement of the movable section is effected by means of a toothed
bar 13, pivotally connected at one end to the front standard 4, and supported at
a suitable distance from the section by a guide box 14, in which is mounted a
pinion adapted to intermesh with the rack bar. On the upper end of the shaft

page_text: of the pinion is keyed a hub provided with a series of radial arms 15, whereby the
pinion may be rotated to shift the rack and table, as required.
In bending or welding pipe, the bell is slipped over the tang or tongs attached
to the skelp, and dropped into the hell holder 16, secured at or near the front
end of the movable bench section: The tang or tongs are then connected to the
buggy 17, the wheels of which move on the bench outside of the guide ribs. The
buggy is next connected to the constantly moving draft chain by a double hook 18,
as shown in Fig. 8. Any other suitable means may be employed for connecting
the tang or tongs to the draft chain.
As shown in Figs. 3 and 5, the bottom of the groove formed by the ribs 6, 6ª,
on the bench is in plane tangential or approximately so, with the bottom of the
groove in guide pulley 10, so that the diverging portions of the ribs G, will
prevent any lateral displacement of the draft chain on the guide pulley, when the
table is shifted in either direction from middle position.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. A draw bench for bending or welding pipe having in combination a stationary
rear section, a movable front section pivoted to the rear section and of a length
greater than that of the rear section, a bell or die holder, and a draft chain, sub-
stantially as set forth.
2. A draw bench for bending or welding pipe having in combination, a stationary
rear section, a movable front section pivoted to the rear section, a draft chain
mechanism stationary as against lateral movement for operating the draft chain
and a bell or die holder, substantially as set forth.
3. A draw bench for bending or welding pipe having in combination a stationary
rear section, a movable front section pivoted to the rear section, a draft chain,
guide pulleys on the front and rear sections for the draft chain, guide ribs on
the bench sections for retaining the draft chain on the rear guide pulley, mechanism
for operating the draft chain and a bell or die holder, substantially as set forth.
D
c{ hi ith love of Vaugh A TY 1900
Witnesses:
DARWIN S. WOLCOTT,
F. E. GAITHER.
THOMAS JOSEPII BRAY.