Improvements in Machines for Making Joints for Tubular Articles.
Year: 1898

page_text: Date of Application, 19th Mar., 1898-Accepted, 22nd Oct., 1898
COMPLETE SPECIFICATION.
Improvements in Machines for Making Joints for Tubular Articles.
I, JOSEPH NATHANIEL HALIFAX, of 6130, La Salle Street, Chicago, United States
of America, Mechanical 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 a machine for constructing joints for tubular articles,
such as the frames of bicycles, of that kind consisting of an external tubular part
or socket and an inner tubular part the end of which is inserted within the socket
and is distended or expanded into close contact with the inner surface of the
socket, which latter is roughened to form interlocking recesses and projections
in the interfitting members after the inner part has been distended within the
The invention consists in the matters hereinafter described and
pointed out in the appended claims.
outer one.
A machine embodying the present invention is more especially intended for the
joining of tubular frame members, such as those of a bicycle frame, to fitting or
junction pieces of that kind consisting of tubular parts provided with thimbles
which intersect the same at an angle and wherein the tubular member is joined
to the fitting by expanding means inserted through the tubular member from the
end thereof remote from the fitting. The machine herein illustrated as embody-
ing my invention embraces an expanding mandrel of that kind having an endwise
movable and rotative actuating spindle which mandrel is mounted on the end of a
hollow shaft of sufficient length to pass through the tube to be operated upon,
combined with a clamping device by which the fittings and the tube are accurately
held in the desired relative position during the expanding operation so that said
parts, when finally joined, shall be accurately and exactly held in the desired
relation to each other. The invention may be more readily understood by
reference to the accompanying drawings in which,
Figure 1 is a view in side elevation of a machine embodying my invention.
Figure 2 is a plan view thereof.
Figure 3 is a central longitudinal section of the machine taken on line 3-3
of Figure 2.
Figure 4 is a view in cross section taken on line 4 4 of Figure 1.
Figure 5 is a similar view taken on line 5-5 of Figure 1.
Figure 6 is a similar view taken on line 6-6 of Figure 1.
Figure 7 is a detail section taken on line 7-7 of Figure 2.
Figure 8 is a detail section taken on line 8-8 of Figure 7.
Figure 9 is a detail partial section taken upon the line 9-9 of Figure 2.
Figure 10 is an enlarged detail section of the connection between the mandrel
actuating spindle and the parts which drive the same.
Figure 11 is a detail section taken on line 11-11 of Figure 10.
Figure 12 is a view in side elevation of a machine intended for securing to its
end fittings, the seat post member of a bicycle frame.
Figure 13 is a detail plan view of parts shown in Figure 12 showing the

page_text: gripping jaws which engage the crank hanger tube or fitting and parts which
operate the same.
Figure 14 is a view in elevation of the parts shown in Figure 13 as seen from
one end of the machine.
Figure 14 is a detail side view of parts shown in Figures 13 and 14.
Figure 15 is a detail plan section drawn to an enlarged scale taken on line 15—
15 of Figure 12.
Figure 16 is a view of the machine embodying my invention with devices for
securing to its end fittings the steering head member of a bicycle frame.
Figure 17 is a detail section taken on line 17-17 of Figure 16.
As shown in the accompanying drawings, A indicates an elongated, horizontally
arranged bed similar to that of a lathe, the same having parallel guide ribs a a
on which are supported two separate castings, forming a bearing plate A¹ and
carriage A2, on which the several operative parts of the machine are mounted
or supported. The bearing plate A¹ carries the actuating devices for an expand-
ing mandrel B and is rigidly attached to the main frame A while the carriage A³
carries holding clamps H, H', J, J, L L¹, by which the tubular parts to be
operated upon are held or clamped in position for the action of the expanding
mandrel thereon. Said carriage is movable endwise upon the guide ribs a a to
enable the expanding mandrel to be inserted in and withdrawn from the tubular
parts to be joined, which are held in the clamping devices on said carriage.
The expanding mandrel B, as herein shown, is of a kind of well known and
familiar construction, the same embracing a cylindric shell B¹ in which are
located a number of conical expanding rollers 6 which project through openings
in the shell and are engaged with the conical end of an actuating spindle B³
which spindle is given rotative and endwise movement with the result of giving
rotative and radial outward movement to the said rollers in a manner common
in such expanding mandrels. The said mandrel is, moreover, attached in the
usual manner to the end of a hollow shaft B3 through which the actuating rod B³
passes, said shaft serving to hold the mandrel from endwise movement when the
actuating spindle is moved longitudinally in the operation of the machine.
First describing the parts for supporting and operating the mandrel actuating
spindle B2 and the shaft B³ these parts are mounted on the bearing plate A¹ and
are constructed as follows: Said bearing plate A¹ is provided with three bear-
ings A3 A4 A5 arranged in alignment with each other and in the axial line of the
expanding mandrel and its actuating spindle B². In the bearing A5 which is
located nearest to the work supporting mandrel is mounted a revolving sleeve C
which is provided with flanges ce at its opposite ends to hold said sleeve from end-
wise movement. To said sleeve C is attached the hollow shaft B³, and said sleeve
turns with said shaft as the latter is given rotary motion through the action of
the expanding mandrel which is attached to its outer end. To enable the sleeve C
to be removed from the machine when desired, the upper part of the bearing A
consists of a removable cap, preferably connected at one side by a pivot a¹ with
the lower part of the bearing and provided at its free margin with a clamping
bolt a (Figure 4). Said bolt is connected by a pivot a³ with a lug in the bear-
ing A5 below the cap and is adapted to enter at its upper end notches formed in
the bearing and in the cap; said bolt a being provided with a thumb nut a' by
means of which the cap may be clamped firmly in place.
In the bearings A3 and A is mounted a hollow driving shaft D, said shaft
being engaged at its opposite ends with said bearings and having attached
thereto, between the bearings, a belt pulley D₁ through the medium of which
rotative movement is given to the said shaft. Said driving shaft D constitutes
the means for giving rotary motion to the actuating spindle B³ of
the expanding mandrel and a driving connection is provided between
said driving shaft and spindle adapted to prevent endwise movement
of the spindle with respect to the shaft, but holding the said parts
from relative rotary movement. Combined with such driving connection,

page_text: devices ate provided preferably adapted for actuating by hand, for giving endwise
movement to said spindle with respect to the shaft. The driving connection
between said shaft and spindle, as herein-shown, consists of a sleeve E which is
split or made of two semicircular parts which fit within the interior of said
shaft D and are held from rotation therein by means of set screws e e, which pass
through the shaft and engage recesses in the parts of the sleeve, Figures 10 and 11,
or like means. The sleeve E is connected with the spindle 132 by means of splines
or keys el which fit within suitable seats or recesses in the inner faces of the
two parts of the sleeve and enter longitudinal guide grooves b¹ formed in the said
spindle. The splines el are held from endwise movement with respect to the
sleeve E by suitable interfitting recesses and projections on said parts, herein
shown as having the form of outwardly projecting lugs (Figure 10) on the
The said sleeve E is
splines which engage radial openings in the sleeve.
preferably located at the end of the hollow shaft D nearest the work supporting
carriage. The longitudinal grooves 61 in the actuating spindle B3 are of such
length as to give the full extent of endwise movement in the actuating spindle
necessary for properly operating the rollers the expanding mandrel
and such endwise
is produced by means
movement
actuating
device adapted to engage the end of said actuating spindle which extends
past the sleeve E and which has rotative engagement with the said spindle, so
that it may be constantly driven or rotated by the action of the shaft D and con-
necting devices described while at the same time it will be free to move or slide
endwise with respect to said shaft.
of
of an
To now describe the devices for giving endwise movement to the said actuating
spindle, the same consist generally of a plunger F located within the shaft D
and adapted to slide endwise therein, together with means giving endwise move-
ment to the spindle F consisting in the instance illustrated of a rack and pinion
device. These provide a connection between the mandrel actuating spindle B³
and the plunger F, the said spindle B2 is provided with a cylindric head B
and the plunger with a recess adapted to receive said head together with a
thimble F which surrounds the actuating spindle and has screw threaded engage-
ment with the plunger in such manner as to bear against the shoulder formed
at the junction of the head with the actuating spindle and thus retain the actuating
spindle from endwise movement with respect to the plunger while permitting the
said spindle to turn freely in the plunger. The rack and pinion devices referred
to consists of a rack bar F2 attached to or forming part of the plunger F and a
pinion G formed on or attached to an actuating shaft G¹ which is mounted at its
inner end in a bracket A6 attached to the rear end of the bearing plate A¹. Said
shaft G¹ extends at one side of the machine and is provided with levers or other
means by which the same may be easily operated by hand.
The devices described obviously constitute a means by which the supporting
shaft B3 of the expanding mandrel is held from endwise movement while being
left free to rotate and the actuating spindle of said mandrel may be rotated
rapidly by power and given endwise movement by the operator.
Now referring to the clamping devices mounted on the carriage As for the
purpose of holding the parts to be joined in proper relative position during the
act of making the joints, these parts are made as follows: H H indicate the
pair of clamping jaws which are mounted on the end of the carriage A nearest
the mandrel actuating devices and are adapted to engage the socket member of
the parts to be joined, such for instance as the fitting or junction piece I which is
J Ji indicate a pair of clamping
provided with an integral thimble or socket i.
jaws which are located at the central part of the carriage and are adapted for
engagement with the tube which is to be inserted within the socket member, such
tube in the instance shown consisting of a tubular frame member K, of a bicycle
5 frame. A third pair of clamping jaws L L is located at the outer extremity of
the carriage and is adapted for engagement with a second socket member such for
instance as the fitting or junction piece M; the same being provided with an

page_text: integral thimble or socket piece m. The fittings I and M and the tubular frame
member K illustrated in the instance shown constitute the upper horizontal frame
member of a bicycle, the fitting M constituting the one used to join the said upper
frame member to the front part or head of the frame while the fitting I is one
used to connect the upper frame member with the seat post member. Said fitting
I has the form of a split collar such as is sometimes used when the fitting at
the upper end of the seat post member forms a clamp to support the seat post of
the saddle. By reason of the split form of the fitting I, the same may be left
in its open or spread condition as seen in Figure 2 so as to permit the insertion
of the expanding mandrel through said fitting in the process of joining the
tube K to the fitting M and to said fitting I, it being obvious
that when such fitting I is adapted for the passage through it of the
expanding mandrel, the integral fittings or junction pieces may be attached
to both ends of the tube by inserting the expanding mandrel through the fitting
I and the tube K when all three of the parts are held or clamped in position with
respect to each other. The machine illustrated is, therefore, designed for use in
cases in which it is desired to secure to a straight tube, junction pieces at each
end of the same and in which the mandrel can pass through one of the junction
pieces.
To provide for variation of the length of the inner or tubular member K, the
clamping jaws H H and L L' are mounted on supporting plates N and O which
are separately adjustable upon the carriage A2 in a direction endwise of the
carriage, the adjustable connection illustrated consisting of ribs no on the lower
surface of said plates, which ribs engage corresponding grooves in the carriage
and bolts no Fig. 1 which pass through lateral horizontal flanges on the
carriage and enter the lower surface of the plates, the holes through which the
bolts pass being longitudinally slotted to afford the desired extent of adjustment
in the plates. The clamping jaw L is secured directly to the plate O, preferably
abutting at its outer face against an integral flange 01 which rises from said
plate and affords a rigid lateral support for the said jaw; the latter being held
upon the plate by the screws as shown or like means.
The clamping jaw L' (Figure 7) is adapted to slide laterally on the plate O
and for this purpose is attached to a sliding block 02 which is held or guided
in its lateral movement by means of a depending rib o thereon which enters
a transverse guide slot in the plate O, said rib having attached to its lower surface
a plate o³ (Figures 8 and 9) which plate engages at its side edges with horizontal
downwardly facing bearing surfacts on the plate 0) so as to hold the sliding
block from rising. Lateral movement is given to the sliding block (2 by
means of a hand lever Of which is connected with said block by a link o and
provision is made for rigidly holding the said movable clamp jaw L' in contact
with the stationary one, consisting of a screw shaft 0' which engages a bar ()³
mounted on the plate and bears at its inner end directly against the clamping
jaw L. Said screw shaft (* is provided with a hand lever (6 by which it may
be actuated. The said bar ( is shown as resting at its ends against the inner
surface of two lugs of which project upwardly from the plate () and as being
connected with one of said lugs o by means of a pivot stud o7; this construction
giving a strong and rigid lateral support for the bar and permitting the said
bar 05 together with the screw shaft carried thereby to be swung upwardly and
outwardly away from the path of the movable clamping jaw, thereby leaving said
clamping jaw free to be moved outward and inward when inserting the work
and at other times. The plate N, which supports the clamping jaws H H¹,
provided with actuating parts for the movable clamping jaw H like those upon
the plate 0, said plate N having an upwardly projecting flange N1, Fig. 5, a sliding
block N for supporting the jaw H, a hand lever N connected by a link with
the said sliding block and a hinged pivoted bar No bearing against the lugs n³ no
and carrying a screw shatt N which is provided with an actuating lever No;
is

page_text: all of these parts being like the corresponding parts shown in connection with
the plate O.
The intermediate clamping jaws J J by which the tubular part K is held are
shown in Figures 2, 3 and 6 and are made as follows: Said jaws are mounted
on a plate P which is secured to the carriage in the same manner as the plates N
and and is provided with an elevated part or flange P¹, against which the
stationary jaw rests. The movable jaw J' is attached to a sliding block P³
which is provided with a depending guide rib p, Figure 1, engaging a transverse
guide groove in the top surface of said plate P. For holding the movable jaw
in contact with the work, a pivoted detent lever Q is provided. Said lever is
connected at its rear end by a pivot q with the rear part of the plate P and
extends forward over the clamping jaws until it terminates in a hand piece. Said
lever is provided with two depending arms Q' which are adapted to engage with
two bearing surfaces p³ ³ formed upon the outer face of the block P2 at either
side of a central flange which serves to strengthen or stiffen the said block. When
inserting the work in the machine the lever Q is thrown backwardly to leave
a clear space above the clamping jaws and after the work is in place and the
movable jaw with its supporting plate is pushed against the work, the lever Q
is then thrown forward and downwardly until the arms Q¹ engage the block and
thereby retain it from outward movement.
For convenience in operating upon a number of tubes of the same length, I
provide adjustable stops for the carriage A2, one stop being arranged to limit the
inward movement of the carriage at the time the mandrel is in position to act
on the outer end of the tube (this being the position illustrated in the drawings)
and the other to limit the movement of the carriage when the expanding mandrel
is in position to act upon the inner end of the tube or that which is within the
socket i of the fitting I. A stop R for limiting the inward movement of the
carriage is shown as having the form of a horizontal set screw inserted in the
bearing plate A¹ and projecting therefrom in position to engage the end of said
carriage. A stop R₁ to limit the outward movement of the carriage is shown as
consisting of a similar set screw inserted through a transverse bar R² which is
attached at its ends to the main frame A. near the outer end of the latter. Said
bar is pivoted at one end to the frame so that it may be thrown out of the path
of the carriage to permit the latter to be moved backwardly far enough to admit
the insertion of the mandrel into the tube and its removal therefrom.
The clamping jaws H H L L' are shown as shaped to receive or embrace
junction pieces or fittings I and M of the kind used in bicycle frames but it will,
of course, be understood that such clamping jaws will be made of any shape
necessary to properly engage and hold tubular parts or sockets of any kind which
are to be secured to an inner tubular part by the use of the apparatus described.
In cases where the attachment of one end only of a tube to an exterior part or
socket is required, the use of three sets of clamping jaws will, of course, be
unnecessary and one of the exterior sets may be removed from the machine or
omitted in the construction of the same.
In Figures 12 to 15 I have shown a machine which is like that illustrated in
Figures 1 to 11 with the exception of the following details. The machine illus-
trated in this instance is for the purpose of securing to the seat post member of
a bicycle frame the end fittings which are attached directly to the same, consisting
of the seat post socket or fitting and the hanger fitting; said seat post member
being indicated in the drawing by K', the hanger fitting by S, the lower frame
member by K, the frame head by K³ and the fittings connecting the frame head
with the upper frame member K and the lower frame member K2 by M and T
respectively.
The rear clamping jaws L L' or those remote from the mandrel actuating
levices are in this instance shown as arranged to engage the crank hanger
member or fitting S and for this purpose they are arranged to engage and clamp
the sockets of said fitting which receives the seat post member K' as seen in

page_text: Figures 13 and 14. The devices for actuating the said clamping jaws are like
those before described and are lettered in the same manner in the drawing and
need not here be further referred to.
For holding the fitting from backward displacement such as may occur by the
socket S slipping backwardly out of its clamping jaws, a holding device is pro-
vided as follows: Attached to the plate O is a bracket 07 to which is pivoted a
detent 08 which, when in a horizontal position bears at its free end against the
fitting, but which, when thrown upwardly and backwardly, leaves the fitting free
to be removed backwardly from between the clamping jaws.
The machine illustrated in said Figures 12 to 15 is intended for securing the
seat post member of the frame to the end fittings thereof after the other main
parts of the frame, namely the upper and lower frame bars K and K and the
tubular frame head K³ have been joined to each other and to the said end fittings
and, as a further improvement, I attach to the plates N and O which support said
clamping jaws upwardly extending arms U U₁ which are provided at their upper
or outer ends with clamping devices adapted to engage the frame members K
and K2 at a point considerably above the said clamping jaws and to thereby hold
the said frame bars rigidly in proper position with respect to the frame bar K¹
which is to be secured thereto. The arms U U₁ are shown as arranged obliquely
and inclined toward each other so as to support the clamps upon their upper ends
in proper position for engagement with said frame members. Said arms U U¹
are shown as attached to the plates N and 0 by means of intermediate cast-
ings U2 U³ which are bolted to the inner ends of the arms and are also bolted
to the rear or outer faces of the upwardly projecting parts or flanges N¹ 0¹ of the
said plates N and O. The clamping devices at the upper ends of said arms :U U¹
are shown as consisting of clamping jaws u u¹ Fig. 15 of which the clamping
jaw is made integral with the upper ends of the arms and the jaw u is
pivoted thereto by means of a pivot u². For drawing together the jaws u u¹ to
properly clasp the frame member, a "U" shaped yoke piece u³ is pivoted to one
end of the stationary jaw by means of a pivot u; the said yoke piece being
adapted to swing around or over the adjacent end of the movable jaw ¹ and
being provided with a set screw 5 by means of which the free end of the movable
jaw may be forced toward the stationary one in the act of clamping the jaws
around the frame bar.
In Figures 16 and 17 I have shown a machine which is generally like those
herein before described but which is intended for connecting the head member K³
In this instance, the
of a bicycle frame with the fitting M and T thereof.
carriage A is made much shorter than in the other machines illustrated and the
intermediate clamping device, which engages the tubular frame member K³, is
mounted on the plate () instead of being mounted on a separate plate as in the
before described figures of the drawing, the said plates N and O being arranged
at only a short distance apart by reason of the relatively short length of said
member K³. The clamping jaws for the fittings M and T are in this instance
made in the same manner as before described, the same being, of course conformed
upon their inner faces to the shape of the said fittings. The clamping devices
for the tube K³ which, as before stated, is mounted on the plate (), consists of
a clamping jaw V₁ bolted to the plate 0 and carrying a pivoted clamping jaw V³
which is pivoted to the stationary jaw V₁ near the bottom of the latter. A "U"
shaped yoke or bail V³ is connected with the upper end of the stationary jaw by
a pivot and is adapted to extend at its free ends around a narrowed upwardly
projecting part of the clamping jaw V2. A thumb screw is inserted through
the central part of the bail V³ and is adapted to bear against the upper end of
the hinged jaw V2 so as to draw the jaws together and thereby confine the tube
tightly between the same. The clamp jaw supporting plates N and are
shown in Figure 12 as being provided with supporting arms U U¹ which are
bolted to the said plates and extend upwardly therefrom as shown in said

page_text: Figure 12. The arms U U¹ shown in this instance are provided with clamping
jaws u u¹ made in the manner as hereinbefore described.
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:-
1. An apparatus for the purpose set forth comprising an expanding mandrel
provided with a supporting shaft and with a rotative and endwise movable
actuating spindle, and means for supporting the tubular parts to be operated
upon comprising a carriage which is movable in a direction longitudinally of the
said shaft and spindle and clamping or holding devices on the carriage adapted
for engagement with said tubular parts.
2. An apparatus for the purpose set forth comprising an expanding mandrel,
clamping devices for holding in place the tubular parts to be operated upon, one
of said clamping devices being constructed to engage the exterior part or socket
and the other the inner or tubular part, and a carriage which supports both of
said clamping devices and is movable in a direction longitudinally of the
expanding mandrel.
3. A machine for the purpose set forth comprising an expanding mandrel
and clamping devices for engaging the tubular parts to be operated upon by the
expanding mandrel, one of said clamping devices being adapted to engage the
exterior part or socket and the other the inner tubular part which enters such
socket, a carriage which supports the said clamping devices and is movable in
a direction longitudinally of the said spindle, one or both of said clamping devices
being adjustable upon the carriage in a direction longitudinally of the expanding
mandrel.
4. A machine for the purpose set forth comprising an expanding mandrel,
clamping jaws to engage the parts to be operated upon, plates on which said jaws
are mounted, means carried by said plates for actuating said jaws, and a carriage
on which said plates are mounted and on which they are separately adjustable
toward and from the mandrel.
5. A machine for the purpose set forth comprising an expanding mandrel pro-
vided with an endwise movable and rotative actuating spindle and with a rotative
hollow shaft for holding the mandrel from endwise movement and means for
supporting and actuating said shaft and spindle comprising a rotative sleeve to
which said shaft is attached, a plate provided with a bearing for said sleeve,
constructed to hold the same from endwise movement, a hollow driving shaft
with which said spindle is connected by means affording longitudinally sliding
but non-rotative engagement between said spindle and shaft, bearings in said
plate for said driving shaft, a plunger sliding in the said hollow shaft having
rotative connection with the said spindle and a carriage for supporting the tubular
parts to be operated upon, which carriage is movable in a direction endwise of
the said mandrel and is provided with clamping or holding means to engage said
tubular parts.
6. A machine for the purpose set forth comprising an expanding mandrel, a
carriage which is movable longitudinally with respect to said mandrel, clamping
means on said carriage comprising stationary and movable clamping jaws, a
sliding block on which the movable jaw is mounted, a hand lever connected with
said block for shifting said movable jaw and a set screw adapted to bear against
the movable jaw to hold it in its closed position.
7. A machine for the purpose described comprising an expanding mandrel, a
carriage which is movable longitudinally with respect to said mandrel and clamp-
ing means on the said carriage for the tubular article to be operated upon com-
prising stationary and movable clamping jaws, a hand lever connected with the
movable jaw for actuating the same, a clamping screw adapted to bear upon
the movable jaw and a movable bar carrying said set screw engaged at its ends
with parts on the machine frame.

page_text: 8. A machine for the purpose set forth comprising an expanding mandrel and
clamping means for a tubular part to be operated upon comprising stationary
and movable clamping jaws, a plate on which the said jaws are mounted, a block
sliding laterally in said plate to which the movable jaw is attached, a hand lever
connected with said block for actuating the movable jaw, a bar extending in front
of the movable jaw and a clamping screw inserted through said bar adapted to
bear upon the movable jaw; said plate being provided with holding lugs engaging
the outer face of said bar at either side of said clamping screw.
9. A machine for the purpose set forth comprising an expanding mandrel and
clamping means for holding the tubular article to be operated upon comprising
stationary and movable clamping jaws, a plate on which the same are mounted,
said plate being provided with two holding lugs, a supporting bar adapted to
engage both of said lugs, and pivoted to one of the same and a clamping screw
passing through said supporting bar and engaging the outer face of the movable
jaw to hold the said jaws closed.
10. A machine for the purpose set forth comprising a horizontally arranged
expanding mandrel provided with a hollow supporting shaft and an actuating
spindle and a carriage which is movable longitudinally with respect to the said
mandrel, said carriage carrying three separate sets of clamping jaws of which the
external jaws are constructed for engagement with tubular fittings and the inter-
mediate jaws are constructed to engage a tube which is to be fastened to said
fittings, said second clamping jaws being adjustable longitudinally upon the
carriage.
11. The combination with a machine frame, of an expanding mandrel, clamp-
ing means for holding in place the socket part and tubular part to be secured
together and an arm on the machine frame provided with clamping or holding
means adapted for engagement with a frame member which is attached to said
socket part.
12. The combination with a rotating expanding mandrel provided with an
endwise movable and rotating actuating spindle, of clamping jaws adapted for
engagement with a tubular socket or fitting, a bearing plate on which said clamp-
ing jaws are mounted, an endwise movable carriage sustaining said clamping
plate and a rigid supporting arm attached to said supporting plate and provided
with means for engaging and holding in place a frame tube which is secured to
said fitting.
1
101
1
1
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.