Improvement in the Manufacture of Steel Railway Chairs, and Sleeper with Chair Combined.
Year: 1896

page_text: Date of Application, 21st May, 1896
Complete Specification Left, 8th Feb., 1897-Accepted, 8th May, 1897
PROVISIONAL SPECIFICATION.
Improvement in the Manufacture of Steel Railway Chairs, and
Sleeper with Chair Combined.
ANDREW ERSKINE MUIRHEAD Forgeman Cart Forge Crossmyloof Glasgow
do hereby declare the nature of this invention to be as follows:-
I take a blank or billet of steel about the weight of the chair required, on which
I make intermittent ridges or projections by stamping or rolling. Part of those
ridges or projections I then punch through from base to form jaws.. I may either
form each jaw of one piece as in my Patent No. 19656 1894, or I may form them
of two prongs-that is each jaw has a space between as in my Specification 22669,
27th November 1895 or it may be that a web connects the two prongs. The jaws
after being punched up from base, are pressed against a mandril to give them the
proper contour to receive rail & key. With sleeper & chair combined I proceed
much in the same way. The billet is so much longer.
Dated this 19th day of May 1896
A. ERSKINE MUIRHEAD.
Improvement in the Manufacture of Steel Railway Chairs, and
Sleeper with Chair Combined.
ANDREW ERSKINE MUIRHEAD Forgeman Cart Forge Crossmyloof Glasgow
N.B. 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:-
I take a blank or billet of steel about the weight of the chair required on which
I make intermittent ridges or projections by stamping or rolling. Part of these
ridges or projections are then punched through from base to form jaws.
I may either form each jaw of one piece, as in my Patent, No. 19656, 1894,
or I may form them of two prongs; that is, each jaw has a space between, as in
my Specification, No. 22669, 27th November, 1895, or it may be that a web
connects the two prongs.
The jaws after being punched up from base are pressed against a mandril to give
them the proper contour, to receive rail and key.
With sleeper and chair combined I proceed much in the same way. The billet
is so much longer.
In the process of stamping the transverse section of prongs may be decreased
towards point, with the object of gaining greater strength at root of said prongs,
and consequent saving of material.
Although I have only described one form of chair it must not be understood that

page_text: I confine myself to this form only. For example my invention is equally applicable
to chair for flat-bottom section rails, slide and check chairs.
And I may in some cases prefer to punch up lug or lugs from part of base, under
rail bed.
I will now proceed to describe, with reference to the accompanying drawings,
the manner in which my invention is to be performed.
Figures 1 and 2 shew plain sides and view of billet.
Figures 4 and 5 shew side and end when jaws have been punched up.
Figure 3 shews plan of jaws bent up, with recesses in base, out of which jaws
have been punched.
Having now particularly 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 :-
A steel or wrought iron chair, or sleeper with chairs combined, in which the
jaws are formed of prongs, or teeth punched up from base, said prongs having
a thickness greater than the thickness of base; and the transverse section of said
prongs may decrease from base attachment, or root of prongs, upwards, substantially
as described.
Dated this 6th day of February 1897
A. ERSKINE MUIRHEAD.