DISCLAIMER AND MEMORANDUM OF ALTERATION
Year: 1878

page_text: by Francis M. Lechner, in the City of Columbus, in the State of Ohio,
and United States of America), bearing date the 21st February 1878,
No. 728.
DISCLAIMER AND MEMORANDUM OF ALTERATION proposed to be
lodged by the said Francis M. Lechner, assignee of the said Charles Barlow,
pursuant to the Statutes in that case made and provided.
WHEREAS Her present Majesty, by Her Letters Patent, bearing date the said
21st February 1878, did grant unto the said Charles Barlow, his executors,
administrators, and assigns, the sole privilege to make, use, exercise, and vend
within the United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, the said Invention (communicated to him from abroad by the
said Francis M. Lechner), for the term of fourteen years from the date of the said
Letters Patent:
And whereas the said Letters Patent by deed of assignment dated 14th October
1880, and registered 18th October 1880, were assigned to the said Francis M.
Lechner:
And whereas since the filing of the Specification in pursuance of of the said
Letters Patent, it has been ascertained that some of the claiming clauses are too
wide, and may be construed to claim more than the Patentee was entitled to
claim at the date of the said Patent:
And whereas certain clerical errors contained in the said Specification require
correction :
Now therefore the said Francis M. Lechner, by and with the leave of Her
Majesty's Solicitor General desires to make the following alterations, that is to
Bay :-
On page 2, line 4, to alter C' to C, and in line 7 to strike out the letters C, C¹, C³,
and insert the letter C².

page_text: In line 8, to strike out the words "
to insert the following words instead:
No. 1707, dated 22nd April 1876."
In line 39, to alter J² to I³
and
my Patent No. dated
"The Specification of H. J. Haddan's Patent
In line 44, to cross out the letter and to substitute therefor "(see Figure 7)."
In line 48, to cross out the letters 1, 1, and to substitute therefor " (see
Figure 7)."
In line 52, to add the words "as shewn at Figure 1" at the end of the
sentence.
On page 3, in line 24, to strike out the words "which is in many respects
preferable to that shewn in Figure. 1."
In line 56, to add after the word "carriers" the words "for the purpose and."
On page 4, to strike out the 3rd and 6th claims, and to alter the ordinals of the
following claims by substituting the word "third" for "fourth," the word "fourth"
for "fifth," and the word "fifth" for "seventh," and in the said third claim as altered
to insert after the words "chains T" the following: "when supported in overhanging
supports, as hereinafter mentioned in the fifth claiming clause and used."
And in order that the effect of the Disclaimer and Memorandum of Alteration
may be better understood, I declare that the said Specification when so disclaimed
and altered as aforesaid will read as follows:-
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
BARLOW, of 23, Southampton Buildings, Chancery Lane, London, Patent Agent,
send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS IN MINING
MACHINES," (a communication to me from abroad by Francis M. Lechner, in the
City of Columbus, in the State of Ohio, and United States of America), and have
petitioned Her Majesty to grant unto me, my executors, administrators, and assigns,
Her Royal Letters Patent for the same, and have made solemn declaration that it
has been communicated to me from abroad by Francis M. Lechner, in the City of
Columbus, in the State of Ohio, and United States of America..
NOW KNOW YE, that I, the said Charles Barlow, do hereby declare that the
following Complete Specification, under my hand and seal, fully describes and
ascertains the nature of the said Invention, and in what manner the same is to
be performed in and by the following statement, reference being had to the
accompanying Sheet of Drawings forming a part of this Specification, that is to
Boy :-

page_text: C, C, are shoes attached to and projecting forward from the carriers; C₁ is the
cutter head, by preference square, in cross section, except where it is rounded to fit
the bearings in the shoes; C, C³, are sprocket wheels keyed to the cutter head;
C are the cutter teeth similar in their construction and arrangement to those
shown in the Specification of H. J. Haddan's Patent, No. 1707, dated 22nd April,
1876, except that teeth C³ are attached to the sprocket wheel at such distances
apart that they will pass between the plates of which the alternate links of the
driving chain are made. D is the cylinder; D₁, the valve chest; d, the crank;
d', the pitman; and d² the piston rod of an engine to be driven by compressed air
in the usual manner.
It will not be necessary to describe the engine in detail, nor the frame which
supports it upon the carriers B, B.
F is a spur pinion upon the crank shaft of the engine meshing with spur gear F,
which is mounted upon shaft F2, this shaft being mounted in slots fin brackets F×
projecting from the posts of the frame, which slots form segments of circles, the
centre of which is the centre of which is the centre of the crank shaft; thus
shaft F may be raised or lowered in the slots without disturbing the mesh of the
gears F, F. The driving chains f¹ (preferably one upon each side of the machine)
pass around squared portions of the shafts F, E¹; other chains pass around the
cutter shaft C and shaft E', which is mounted in bearings upon the carriers or
upon the posts, as under some circumstances I propose to adjust the shaft E' toward
or from the cutter head C2, in order to tighten the driving chain E, and chain f¹
can be tightened by raising shaft F in slots f by set screws or otherwise; f" is a
clutch faced coupling sliding on shaft F, but prevented from rotating thereon by
means of a spline or feather, and engaging with the clutch faced hub f³ of spur
gear F; is the end of a shipping lever used to shift the coupling f2.
G is a worm secured to the crank shaft by a key or set screws g³, and is
adjustable longitudinally upon the shaft; G¹ is a worm wheel which takes into
the under side of the worm G. The shaft g of the worm wheel is mounted in
bracket arms or yokes g' secured to the posts of the machine, and can be adjusted
transversely of the machine in order that the worm wheel may be kept in proper
working relation to the worm G whenever said worm is moved upon the crank
shaft for a purpose which will be hereafter explained; C++ is a sprocket wheel
keyed to the opposite end of shaft g.
H is a chain connecting sprocket wheel G with a sprocket wheel I attached to
the tubular nut carrier, which I will now proceed to describe, referring to
Figures 6, 7, and 8; the inner portion of the nut carrier consists of a cylindrical
end 12 provided with a tubular bearing I¹, a smaller cylindrical part I³, and an
intermediate conical portion provided upon opposite sides with recesses or throats i,
see Figure 8. The tubular bearing I' is supported on the frame or on a standard I* ;
rising from the frame i¹ are wings or webs extending from the cylindrical portion I'
to the part I. L is a shell or sleeve fitting over the inner part, and provided with
slots (see Figure 7) corresponding in location to the recesses i. The nut is made in
two sections O, O', see Figure 7, whose outer faces fit closely the inner surface of
the shell L when the parts are in the position shewn in said Figure.
0, 0, are set screws passing through slots (see Figure 7) into the nut sections.
Qis a ring seated in the grooves which is formed by two ribs o¹,o', on the outside of the
front smaller end of the shell L. The ring Q is provided with projecting arms q', q³,
the arm q' being pivoted to the frame, while the arm q is connected with a hand
lever or with a notched arm q3 projecting from the frame, as shewn at Figure 1.
When preferred a forked shipping lever may be employed in place of the ring
and arms, the inwardly projecting spurs of the fork taking into the groove between
the ribs o¹, o¹.
It will be readily seen that when the parts of the nut carrier are in the position
shewn in full lines, Figure 7, the nut sections, are held firmly.in contact with the
screw, and that if the nut carrier and nut be rotated by means of chain H, the
carriers B, B, the cutting apparatus and its mechanism will be fed forward into

page_text: the coal or rock; and it will also be seen that when the shell L is shifted forward
into the position shewn in dotted lines in Figure 7, the nut sections will be with-
drawn from the screw.
Should it be found desirable to tighten chain H, this can be done by moving
the worm wheel G' toward one end of the crank shaft, when the worm G should
also be moved.
The screw shaft K is rigidly supported in standards k³, k, rising from the cross
girts of the main frame, so that when the nut is griped upon this shaft, and is
rotated by means of chain H. The cutting apparatus and engine are advanced
upon the sills at the desired speed.
In order to remove from the drift such cuttings as are not brought out by the
driving chains E, I employ scraper chains T, each link of which is made of a thin
flat bar or strip of metal bent into a U shape, as shewn detached in Figure 1, the
scraper chain being mounted and driven as follows:-S is a shaft supported in the
carriers B, B, and provided with spurred or sprocket wheels a' rotated by chains E.
The outer ends of shafts S have sprocket wheels attached, or are squared so as to
drive the scraper chains. 8, 8, are boxes adjustably secured to each carrier and
carrying the shaft V, the ends of which have rollers v', v', or their equivalent
attached thereto to support the rear ends of the outer scraper chains.
In Figure 10 I have shewn a construction of devices for supporting the rear ends
of the scraper chains. Referring to Figure 10, A is the sill, B the carrier. V is a
short shaft arranged between the carriers, having its ends journalled in one end of
a strap or hanger which is secured to and travels with the carriers B; the outer
end of this strap or hanger overhangs the sill A, and has a stud or spindle & pro-
jecting therefrom, upon which a loose pulley vs or its equivalent is mounted. There
is one of these loose pulleys upon the outer side of each of the sills, and the rear
portion of the scrapers pass over these pulleys, as will be readily understood.
Referring to Figures 4 and 5, a represents a dovetailed rib formed on or attached
to the inner side of each carrier B; e is a correspondingly dovetailed bracket or
bearing fitted to slide upon the rib a, and provided with a gib e¹ and set screw e²;
e is a lug projecting from the inner face of rib a; and e' is a set screw working in
this lug and bearing upon the dovetailed bracket or box e. By an examination of
Figures 4 and 5 it will be seen that the shaft E' may be thrust from the cutter
shaft by means of set screws for the purpose of tightening chain E when
desired.
In Figure 1 W is a bar or girt attached to the sills, and extending across the
driving chains E; w is a bell crank lever pivoted upon this bar; w' is a locking
dog pivoted to the horizontal arm of lever w and working through a slot in
the bar W directly in line with the upper leg of one of the driving chains.
When I wish to withdraw the cutting apparatus from the coal I thrust the
locking dog w through the slot in the bar W, and into one of the open links of
the chain, thus connecting the chain rigidly with the bar W, and through the bar
with the sills A of the frame when a continued revolution of the engine will
retract the carriers and cutting apparatus, as will be ready understood upon an
examination of the Drawings, and without further explanation.
In Figure which is a slightly modified construction of these devices, the bar W
is arranged below the upper line of the driving chain E, as under some circumstances
this arrangement will be found preferable to that shewn in Figure 1.
Having now described my Invention, what I claim and desire to secure by
Letters Patent is,―
First. In a mining machine, the combination with the carriers of the driving
shaft E', supported between said carriers for the purpose, and substantially as set
forth.
Second. In a mining machine the combination with the screw K of a divided
nut 0, 0¹, its conical support and the enclosing shell L, substantially as set forth.
Third. In a mining machine scraper chains T when supported in overhanging

page_text: supports, as hereinafter mentioned in the fifth claiming clause, and used to remove
the cuttings from the kerf or drift, substantially as set forth.
Fourth. In a mining machine a worm adjustable upon the driving shaft for
actuating the feeding devices, substantially as set forth.
Fifth. In a mining machine the overhanging scraper chain supports, substantially
as set forth.
In witness whereof, I, the said Francis Marion Lechner, have hereunto set
my hand and seal, this Fifteenth day of August, in the year of our Lord
One thousand eight hundred and eighty one.
FRANCIS MARION LECHNER. (L.S.)
I hereby grant my fiat, giving leave to the before named Francis M. Lechner
(the assignee of the herein before mentioned Letters Patent), to file in the Great
Seal Patent Office, with the Specification to which the same relates, the above
5 written Disclaimer and Memorandum of Alteration.
Duted this Twenty ninth day of October 1881.

page_text: LETTERS PATENT to Charles Barlow, of 23, Southampton Buildings, Chancery
Lane, London, Patent Agent, for the Invention of " IMPROVEMENTS IN MINING
MACHINES." A communication from abroad by Francis M. Lechner, in the
City of Columbus, in the State of Ohio and United States of America.
Sealed the 20th August 1878, and dated the 21st February 1878.
COMPLETE SPECIFICATION filed by the said Charles Barlow at the Office
of the Commissioners of Patents on the 21st February 1878.
CHARLES BARLOW, of 23, Southampton Buildings, Chancery Lane, London,
Patent Agent. "IMPROVEMENTS IN MINING MACHINES." A communication from
abroad by Francis M. Lechner, in the City of Columbus, in the State of Ohio and
United States of America.

page_text: A, A, are the sills; A', A2, the cross girts of the main supporting frame; B, B, are
the sliding carriers of the cutter frame supported in the sills by a tongue and groove
or equivalent construction.
C, C₁, are shoes attached to and projecting forward from the carriers; C² is the
cutter head, by preference square, in cross section except where it is rounded to fit 5
the bearings in the shoes; Cs, C³, are sprocket wheels keyed to the cutter head;
C, C¹, C³, are the cutter teeth, similar in their construction and arrangement to those
shown in my Patent, No.
dated
except that teeth Cº are
attached to the sprocket wheel at such distances apart that they will pass between
the plates of which the alternate links of the driving chain are made; D is the
cylinder; D¹ the valve chest; d the crank; d¹ the pitman, and d the piston rod of
an engine to be driven by compressed air in the usual manner.
>
It will not be necessary to describe the engine in detail nor the frame which
supports it upon the carriers B, B.
F is a spur pinion upon the crank shaft of the engine meshing with spur 1
gear F, which is mounted upon shaft F, this shaft being mounted in slots f, in
brackets Fx projecting from the posts of the frame, which slots form segments of
circles, the centre of which is the centre of the crank shaft; thus shaft F2 may
be raised or lowered in the slots without disturbing the mesh of the gears F, F¹.
The driving chains f1 (preferably one upon each side of the machine pass around 2
squared portions of the shafts F, E'; other chains pass around the cutter shaft C²
and shaft E¹ which is mounted in bearings upon the carriers, or upon the posts, as
under some circumstances I propose to adjust the shaft E' toward or from the cutter
head C in order to tighten the driving chain E; and chain f¹ can be tightened by
raising shaft F2 in slots by set screws or otherwise; f is a clutch faced coupling 2
sliding on shaft F2, but prevented from rotating thereon by means of a spline or
feather, and engaging with the clutch-faced hub fs of spur gear F'; f' is the end of
a shipping lever used to shift the coupling f³.
G is a worm secured to the crank shaft by a key or set screws g², and is adjust-
able longitudinally upon the shaft; G' is a worm wheel which takes into the under å
side of the worm G. The shaft g of the worm wheel is mounted in bracket arms or
yokes g¹ secured to the posts of the machine, and can be adjusted transversely of
the machine in order that the worm wheel may be kept in proper working relation
to the worm G whenever said worm is moved upon the crank shaft for a purpose
which will be hereafter explained; G2 is a sprocket wheel keyed to the opposite end
of shaft g.
H is a chain connecting sprocket wheel G² with a sprocket wheel I attached to
the tubular nut carrier, which I will now proceed to describe, referring to Figs. 6, 7,
and 8. The inner portion of the nut carrier consists of a cylindrical end J³, provided
with a tubular bearing I¹, a smaller cylindrical part Is, and an intermediate conical
portion provided upon opposite sides with recesses or throats i, see Fig. 8. The
tubular bearing I' is supported on the frame or on a standard I* rising from the
frame; are wings or webs extending from the cylindrical portion I³ to the part 13;
L is a shell or sleeve fitting over the inner part, and provided with slots l, corre-
sponding in location to the recesses i. The nut is made in two sections 0,0¹,
see Figure 7, whose outer faces fit closely the inner surface of the shell L when the
parts are in the position shown in said Figure.
o, o, are set screws passing through slots 1, 1, into the nut sections; Qis a ring
seated in the grooves which is formed by two ribs o¹, o¹, on the outside of the front
smaller end of the shell L. The ring Q is provided with projecting arms q',q, the
arm q¹ being pivoted to the frame, while the arın q³ is connected with a hand lever
or with a notched arm 73 projecting from the frame.
When preferred a forked shipping lever may be employed in place of the ring and
arms, the inwardly projecting spurs of the fork taking into the groove between the
ribs o¹, o'.
It will be readily seen that when the parts of the nut carrier are in the position
shown in full lines, Figure 7, the nut sections are held firmly in contact with the

page_text: screw, and that if the nut carrier and nut be rotated by means of chain H, the
carriers B, B, the cutting apparatus, and its mechanism will be fed forward into the
coal or rock, and it will also be seen that when the shell L is shifted forward into
the position shown in dotted lines in Fig. 7, the nut sections will be withdrawn
from the screw.
Should it be found desirable to tighten chain H this can be done by moving the
worm wheel G¹ toward one end of the crank shaft, when the worm G should also be
moved.
The screw shaft K is rigidly supported in standards k, k³, rising from the cross
girts of the main frame, so that when the nut is griped upon this shaft and is
rotated by means of chain H the cutting apparatus and engine are advanced upon
the sills at the desired speed.
In order to remove from the drift such cuttings as are not brought out by
the driving chains E I employ scraper chains T, each link of which is made of
a thin flat bar or strip of metal bent into a Ụ shape, as shown detached in
Fig. 1, the scraper chain being mounted and driven as follows:-S is a shaft
supported in the carriers B, B, and provided with spurred or sprocket wheels 8¹
rotated by chains E. The outer ends of shafts S have sprocket wheels attached,
or are squared so as to drive the scraper chains. 8, 8, are boxes adjustably
secured to each carrier, and carrying the shaft V, the ends of which have
rollers v¹, v, or their equivalent attached thereto to support the rear ends of
the outer scraper chains.
In Figure 10 I have shown a construction of devices for supporting the rear ends of
these scraper chains, which is in many respects preferable to that shown in Figure 1.
Referring to Fig. 10, A is the sill; B, the carrier; V is a short shaft arranged
between the carriers, having its ends journalled in one end of a strap or hanger v,
which is secured to and travels with the carriers B; the outer end of this strap or
hanger overhangs the sill A, and has a stud or spindle v projecting therefrom, upon
which a loose pulley or its equivalent is mounted. There is one of these loose
pulleys upon the outer side of each of the sills, and the rear portion of the scrapers
pass over these pulleys, as will be readily understood.
Referring to Figs. 4 and 5, a represents a dovetailed rib formed on or attached
to the inner side of each carrier B; e is a correspondingly dovetailed bracket or
bearing fitted to alide upon the rib a, and provided with a gib e¹ and set screw e²;
is a lug projecting from the inner face of rib a; and e' is a set screw working in
this lug and bearing upon the dovetailed bracket or box e. By an examination of
Figures 4 and 5 it will be seen that the shaft E' may be thrust from the cutter
shaft C by means of set screws e for the purpose of tightening chain E when
desired.
In Figure 1, W is a bar or girt attached to the sills and extending across the
driving chains E; w is a bell-crank lever pivoted upon this bar; w' is a locking
dog pivoted to the horizontal arm of lever w, and working through a slot in the
bar W directly in line with the upper leg of one of the driving chains.
When I wish to withdraw the cutting apparatus from the coal I thrust the
locking dog w through the slot in the bar W and into one of the open links of the
chain, thus connecting the chain rigidly with the bar W, and through the bar with
the sills A of the frame, when a continued revolution of the engine will retract the
carriers and cutting apparatus, as will be readily understood upon an examination
of the Drawings and without further explanation.
In Figure 9, which is a slightly modified construction of these devices, the bar W
is arranged below the upper line of the driving chain E, as under some circumstances
this arrangement will be found preferable to that shown in Figure 1.
Having now described my Invention, what I claim and desire to secure by Letters
Patent is,-
First. In a mining machine the combination with the carriers of the driving
shaft E' supported between said carriers, substantially as set forth.
Second. In a mining machine the combination with the screw K of a divided

page_text: comical support, and the enclosing shell L, substantially as set
forth.
Third. In a mining machine the combination with the sills, the sliding carriers,
and the driving chain E of means for locking the chain to the sills, substantially
as set forth.
Fourth. In a mining machine scraper chains T to remove the cuttings from the
kerf or drift, substantially as set forth.
Fifth. In a mining machine a worm adjustable upon the driving shaft for
actuating the feeding devices, substantially as set forth.
Sixth. In a mining machine the shaft F2 made adjustable for tightening the
driving chain f¹, substantially as set forth.
Seventh. In a mining machine the overhanging scraper chain supports, sub-
stantially as set forth.
In witness whereof, I, the said Charles Barlow, have hereunto set my hand
and seal, this Twenty-first day of February, in the year of our Lord One
thousand eight hundred and seventy-eight.
CHARLES BARLOW. (L.S.)