Improvements in Machines for Setting Tubular Rivets.
Year: 1891

page_text: Date of Application, 1st Jan., 1891
Complete Specification Left. 1st Oct., 1891-Accepted, 7th Nov., 1891
PROVISIONAL SPECIFICATION.
Improvements in Machines for Setting Tubular Rivets.
JOHN FREDERICK CHARLES GEHRLING 32 Pembroke Street, Caledonian
Road London, N. do hereby declare the nature of this invention to be as
follows:-
The improvements consist in adapting to an ordinary machine (including eye-
letting or rivetting) an upper & lower die. The lower die covered by a sleeve
resting upon a spring which permits the sleeve to work up & down on the lower die
& extending above the face of the lower die to any desirable length, thus leaving a
recess into which the head of the rivet is placed. The face of the lower die
being so recessed to correspond to the head of the rivet & the hole in the sleeve
fitting the said head, thus keeping the rivet central with the upper die.
What we claim is a tubular rivet setting machine, consisting of an upper & lower
die. The face of the lower die recessed to the required shape of the head of the
rivet concave or otherwise, upon which a sleeve, the hole fitting the head of
the rivet slides, resting upon a spring, allowing a free movement of the sleeve
up & down. This principle may be applied to a hand-treadle or self-feeding
machine.
Dated this 1st day of January 1891.
JOHN FREDERICK CHARLES GEHRLING.
COMPLETE SPECIFICATION.
Improvements in Machines for Setting Tubular Rivets.
I, JOHN FREDERICK CHARLES GEHRLING, of 32 Pembroke Street, Caledonian
Road, in the County of London, 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 :--
The improvement consist in adapting to an ordinary machine (including eye-.
letting or rivetting) an upper and lower die. The lower die covered by a sleeve
resting upon a spring which permits the sleeve to work up and down on the lower
die and extending above the face of the lower die to any desirable length, thus
leaving a recess into which the head of the rivet is placed.
The face of the lower die being so recessed as to correspond to the head of the
rivet and the hole in the sleeve fitting the said head, thus keeping the rivet central
with the upper die.
I attain these objects by the mechanism illustrated in the accompanying drawing,
in which
The figure is a side elevation of an ordinary machine fitted with the upper and
lower dies.
Portions of this figure is in section.
This invention is constructed with a sleeve i and a set screw j resting on a spring /
attached to the lower die k, this said die k is screwed to the bed of the frame d.
The lower die k is provided with a slot in which the end of the set screw j works
up or down. To the plunger g I fix a projecting pine below which I place a
spiral spring f, and at the base of the plungerg I drill and tap with a female thread,
and in this recess I insert the male screw of the upper die h. Various size upper
dies h may be used provided the male screw is the same size so as to correspond
with the female in the plunger f; a series of lower dies would be constructed to
receive a sleeve, each of the aforesaid are intended to correspond and form a set.

page_text: A
The top of the lower die k is concave in order to receive the head of the rivet.
hole is inserted in the upper die and the lower die k for convenience of unscrewing
one size or fixing another set.
g
If preferable the plunger 9 and the upper die h may be turned out of the same
piece of material.
The face of the lower die k is recessed to the required shape of the head of the
rivet concave or otherwise upon which the sleeve receives the head of the rivet
in its interior; the said sleeve i resting upon the spring / to allow of a free movement
up or down.
The operation of rivetting material together is carried out as follows:-
By inserting a tubular rivet with head downwards in the hole in the sleeve i and
placing the material between the sleeve i and upper die h, which is actuated by the
lever arm a working on a pivot c by the said lever being pulled up in a perpendicular
direction thereby forcing the cam against the top of the plunger 9 pressing the
upper die down on to the rivet and sleeve i on the lower die k thus clinching the
rivet after the machine has forced the rivet through the material. The machine
resumes its normal position directly the lever a is released by the action of the
spring on the pin e fixed to the plunger g.
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. In a tubular rivet setting machine, an upper and lower die with male screws
and the sleeve i with set screw j and slot with the face of the lower die k recessed
to the required shape of the head of the rivet concave or otherwise, and the hole
in the sleeve fitting the head of the rivet, for the purpose of rivetting material
together, substantially as herein described and according to the accompanying
drawing.
2. The combination, in a tubular rivet setting machine of a upper and lower die,
the face of the lower die recessed to the required shape of the head of the rivet
concave or otherwise upon which a sleeve slides, the hole of the sleeve fitting the
head of the rivet and the spring upon which the sleeve rests to allow a free
movement of the sleeve up and down, substantially as described.
3. The combination of the plunger g and the upper die h turned out of the saine
piece of material, substantially as herein described.
4. The combination of the machine to be constructed of any size, of any material,
or with any modification of the various parts, substantially as herein described and
for the purpose set forth.
Dated this 1st day of October 1891
J. P. BAYLY,
18, Fulham Place, W., Agent for the Applicant.