Improved Means or Appliances for Cutting Off Scale from Stays and Plates of Boilers.
Year: 1893

page_text: Date of Application, 10th Jan., 1893
Complete Specification Left, 10th Oct., 1893-Accepted, 11th Nov., 1893
PROVISIONAL SPECIFICATION.
Improved Means or Appliances for Cutting Off Scale from Stays and
Plates of Boilers.
1, RALPH JOHN SMITH, of Pier Engine Works, South Dock, Sunderland,
Engineer, do hereby declare the nature of this invention to be as follows:-
1
This invention relates to improved means, or appliances for cutting off scale
from stays and plates of boilers.
For the purpose of this invention, I apply a die in halves, with suitable cutters
affixed, and revolve the die round the stay by a worm, or ratchet motion working
in straps, and closing together by suitable screws. The die is forced against the
plates by a wedge piece, and the revolving of the die cuts off the scale from the
parts in contact.
Dated this 10th day of January 1893.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Ralph John Smith.
COMPLETE SPECIFICATION.
Improved Means or Appliances for Cutting Off Scale from Stays and
Plates of Boilers.
I, RALPH JOHN SMITH, of Pier Engine Works, South Dock, Sunderland,
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 improved means, or appliances for cutting off scale from
stays and plates of boilers.
For the purpose of this invention, I apply a die in halves, with suitable cutters.
affixed; and revolve the die round the stay by a worm, or ratchet motion working
straps, and closing together by suitable screws. The die is forced against the
plate by a wedge piece, and the revolving of the die cuts off the scale from
the parts in contact.
My invention will be clearly understood by referring to the annexed drawings.
Figure 1 is an elevation from the front or from the back of the apparatus.
Figure 2 an opposite elevation.
Figure
3 a plan of Figure 1.
Figure 4 being a view looking on the meeting face of one half of the appliance
the other half having a like appearance.
A, B, are half circular dies provided with .cutters or scrapers C, C, fitted in
V slots radially and longitudinally in the interior for scraping the stays, and with
other scrapers D, D, in the face in a similar manner for scraping the plates around
the stays. Each half die A and B has an exterior V groove for the reception of
half bands E, F, which when fitted together at the lugs G, H, by the screw bolt I
and pinch nut J, a circle can be formed, the loosening or tightening of the nut
permitting the appliance to be employed on different diameter of stays within a
certain range of sizes. The screw bolt I is swivelled to the lug G, and fits a slot
in the other lug, so that the bolt can be readily swung out of it for removal, or for
placing the appliance in position, the two half dies then opening outwardly from
the pivot pin K, which with the lugs L, M, are arranged out of the centre to give
[Price 8d.]

page_text: free scope for opening and closing, and for passing over the stays for adjustment
and removal.
One of the shaft bands Ę has a paul N pivoted to it and a spring P bears on the
paul to engage in ratchet teeth Q on the two half dies A, B, the ratchet teeth Q
being on the extended edge R of the face plate in which the plate cutters are affixed.
The half bands move freely in the V grooves of the half dies when moved to
and fro by the hand rod S which is forked and coupled to the lugs, there being a.
chain T attached to the band and rod respectively for limiting the thrust or to and
fro motion of the band rod.
Each time the rod S is reciprocated, the paul N by its engagement in the ratchet
teeth Q, causes the cutter teeth C to act circumferentially on the stay on which it
is fitted, or the cutters D on the face to scrape the plate against which the appliance
can be forced by a wedge after being moved along the stays to be in touch
therewith.
Instead of the circular motion of the cutters being obtained stepwise as by the
reciprocation of the rod S it may be a continuous motion by a worm pinion, if
desired.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
As my improved means and appliances for cutting scale from stays and plates of
boilers, the apparatus constructed and arranged in the manner shown on the
annexed drawings, the several parts acting substantially as and for the purposes
described.
The 10th day of October 1893.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Ralph John Smith."