Improvements in Tube Expanders.
Year: 1892

page_text: Date of Application, 15th Nov., 1892
Complete Specification Left, 1st Mar., 1893-Accepted, 15th Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in Tube Expanders.
WILLIAM THOMAS EADES 43 Claremont Road Sparkbrook Birmingham
Engineer do hereby declare the nature of this invention to be as follows:-
My invention relates to improvements in the construction of a tool for the
expansion of tubes generally known as Dudgeon's and its object is to increase the
efficiency and to reduce the cost of production of the same. In constructing a
tube expander in accordance with my invention I make the body or frame in one
peice with recesses formed in it to contain the rolls and a groove is cut round the
outside diameter to allow for a circular spring to cover & hold in place the said
rolls and to allow the passage of the paper expanding mandrill.
The rolls are
formed with one end of smaller diameter and when placed in position the smaller
part is covered by the circular spring working in the groove formed on the body
and embraced it in such a manner that though the rolls are free to expand with the
taper mandrill they cannot fall out of the frame or body, the other end of the rolls
being held in position by a cover which forms part of the body or frame.
Dated this 14th day of November 1892.
WILLIAM THOMAS EADES.
COMPLETE SPECIFICATION.
Improvements in Tube Expanders.
WILLIAM THOMAS EADES of 43 Claremont Road Sparkbrook Birmingham
Engineer 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:-
This invention relates to tools for the expansion of tubes of the class generally
known as Dudgeon's.
By my invention considerable economy in the manufacture of the said tube
expanders is effected and at the same time they are rendered simpler in construction
and more efficient.
Figure 1 of the accompanying drawing represents in part section a tube expander
constructed arranged and fitted according to my invention.
Figure 2 represents a transverse end view of the said tube expander.
Figure 3 represents a roll as used in expander.
Figure 4 represents the circular spring.
a is a taper mandrill made of steel and hardened. c c¹³are three rolls also made
of steel and hardened which are mounted on the mandrill a and kept in position by
a cage or body b and also confined and kept in position at one end by a circular
spring d the other end being held in position by a cover which forms part of the
body or frame. The said spring fits in a groove formed on the circumference of the
cage 6 and bears upon the reduced part of each of the three rolls in such a manner
that while it allows them to expand or contract as the taper mandrill a is advanced
or withdrawn prevents them falling out of cage b. The cage 6 is constructed in
one peice with the chambers for the rolls solid at the ends so that the said rolls
are inserted in position from the front end of cage 6 and kept in position by the
spring d.
ACTION

page_text: to expand, the point of the taper mandrill is inserted between the rolls and the
mandrill is driven by a circular motion which it communicates to the rolls and they
being pressed outward by the taper of the mandrill causes the tube to expand.
Having now particulary described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1st. In tube expanders of the class known as Dudgeon's retaining the rolls in
position by a circular spring as set forth in Figures 1 & 2.
2nd. In tube expanders of the class known as Dudgeon's constructing them with
the cage in one piece in combination with a circular spring to retain the rolls in
position as set forth in Figures 1 & 2.
Dated this 27th day of February 1893.
WILLIAM THOMAS EADES.