Improvements in Pneumatic Rivetting Apparatus.
Year: 1896

page_text: Date of Application, 6th June, 1896-Accepted, 11th July, 1896
COMPLETE SPECIFICATION.
Improvements in Pneumatic Rivetting Apparatus.
I HENRY DOUGLAS EARL of Deva House, Crewe, in the County of Chester, Works
Manager to the London and North Western Railway Company, 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 and
accompanying drawings:-
My said invention relates to pneumatic rivetting apparatus and consists chiefly in
the provision of a carrier or holder for the rivetter, whereby it is firmly held in an
ascertained and constant position, and can be easily manipulated during the formation
of the head of the boiler stay or rivet. The frame for carrying the rivetter is of
a "U" shape and is adapted to be slung or suspended from a crane or other suitable
appliance. At the end of one of the limbs of the said "U" shaped frame I place a
conical ring socket which contains a revolvable conical ring block which carries the
rivetter. The rivetter is adjusted in the carrier so as to strike at the proper angle
and can be moved readily round, being always held at the same constant angle until
the rivet or stay head has been properly formed. At the end of the other limb of
the "U" shaped frame is a setting-up screw with a cupped head which bears on the
opposite end of the stay or rivet to be headed, thereby acting as a holder-up while the
rivetter is at work.
My invention will be more easily understood by a reference to the annexed
two sheets of illustrative drawings.
Fig. 1 is a general view of the aforesaid "U" shaped frame which carries the
pneumatic rivetter, the frame being shown applied to the front of a locomotive
fire box.
Fig. 2 is a vertical section to an enlarged scale of the conical socket ring and
carrying block, which latter carries the rivetter.
Fig. 3 is a plan view of the tripod which is fixed to the base of the conical ring
for the purpose of facilitating the setting and centering of the tool.
The "U" frame A is made in any convenient manner. For example it may be
constructed from plates rivetted together a certain distance apart as indicated in
Fig. 14 or it might be cast or otherwise formed. At its upper part the frame is
provided with a shackle B by which it can be slung from a crane or other
suitable appliance so that it may be readily raised, lowered and moved from rivet to
rivet or from place to place..
.
In Fig. 1 the frame and rivetter are shown applied to the rivetting or heading
of the stays of a locomotive fire box C but this is only by way of example as the
invention is applicable to any other work of a suitable nature. The end of one
limb of the "U" shaped fraine A is arranged to carry the rivetter, while the end
of the other limb is furnished with a cupped or otherwise formed holder-up
block or back support K' carried on the end of an adjusting screw K. The means
for carrying the rivetter consist of a socket ring D in the form of a truncated cone
and having a wing D₁ by which it is bolted or rivetted to the frame A. This
conical socket ring D is bored or turned in its interior so as to receive a turned block E
formed with a bead rim E by taking hold of which the block E can be readily turned
round in its socket or ring D. A washer e secured to the back of the block E

page_text: prevents the latter from leaving the ring socket D. The block E is so formed as to
receive the slide F which can be adjusted in the block by the adjusting screw and
hand wheel F. The rivetter cylinder G fits into this slide F and is securely held
therein by the jamb nuts which are screwed firmly against an india rubber
washer h. The object of the washer is to give a certain amount of resilience to
the rivetter G when at work. The washer h instead of being made of india rubber
might consist of a coiled spring or coiled springs or of any other elastic body
capable of giving the required resiliency. The reciprocating ram or hammer of
the rivetter is marked 9. To steady the appliance and to assist the workman in
setting the rivetter quickly and accurately in position relatively to the rivet, I
secure a tripod H to the back of the ring D by means of screws s. The circular
foot of the tripod has a hole I, the said hole being concentric with the conical ring D.
This hole enables the workman to set the machine quickly concentric with the rivet t
so that no time is lost in adjusting and getting to work. I interpose a washer r of leather
india rubber lead or other suitable substance or material between the circular foot of the
tripod and the plate C or other piece of work against which the machine is set. This
washer prevents slipping during rivetting and also acts as an elastic cushion. The
end of the other limb of the frame A carries a metallic block J which is tapped
to receive a screw K. The inner end of the screw K carries the already mentioned
holding-up cup block K. This cup block is set hard up against the end of the
stay or rivet t by the hand wheel L and ratchet handle L'. Thus the frame A is firmly
clenched in position and the whole apparatus is ready for the rivetting operation.
In place of the holder-up screw K, a ram actuated by fluid pressure might be
employed for the same purpose. The method of operating the apparatus is as
follows. The U shaped frame A is slung into position and adjusted so as to bring
the rivetter into the proper position relatively to the rivet or stay t to be headed.
The screw K is then turned by means of the hand wheel L and handle L' so as to
bring the holder-up cup block K¹ tightly against the opposite end of the stay 1.
Air pressure is then admitted to the rivetter cylinder G, and the hammer g sets to
work the block E being meanwhile turned by hand. In a short time the heading of
the stay is completed.
As the essence of my invention consists mainly in the provision of means for
carrying round the rivetter at a fixed and constant angle relatively to the rivet or
stay being headed, it will be evident that the carrying frame and other parts of the
complete apparatus as hereinbefore described might be modified or partly dispensed
with, without departing from the spirit of my invention.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is.
(1.) The general arrangement, construction and combination of pneumatic
rivetting apparatus substantially as berein before described and shown.
(2.) The improved means for carrying the pneumatic rivetter cylinder, whereby
the rivetter is maintained at a fixed and constant angle relatively to the rivet or
stay to be headed, and can be readily carried round or revolved when at work so
as to form a conically shaped head on the stay or rivet, substantially as described and
shown.
(3.) As means for carrying and revolving a pneumatic rivetter the socket ring D,
ring block E with slide to contain and adjust the rivetter G, and tripod adjuster,
all arranged and combined for the purposes and substantially as described and
shown.
(4.) The employment of an elastic washer or other resilient body interposed
between the rivetter and the block by which it is carried, for the purposes and
substantially as described and shown.
. (5.) As means for setting the improved rivetting apparatus relatively to the
stay or rivet to be headed, the tripod H, with setting hole I and having its foot shod

page_text: with leather, india rubber, lead or other suitable substance or material for the-
purposes and substantially as described and shown.
Dated the 5th day of June 1896.
For the Applicant,
E. K. DUTTON & Co.,
5 John Dalton Street, Manchester, Chartered Patent Agents.