Year: 1887

page_text: I, JOHN BRINDLEY of 629, Wandsworth Road Clapham London S.W. Mechanical
Draughtsman 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:-
A Tubular-rivet or Eylet Set, as ordinarily constructed, consists of a suitable
Standard in which works a vertical Plunger forced down by the pressure of a Lever
or other convenient appliance.
The aforesaid plunger is fitted at its lower end with a setting punch and also carries
a sleeve arranged to slide freely between stops.
This sleeve in its turn carries, by means of flat springs, a pair of pocket-dies which
serve, to guide the Rivet or Eylet whilst it is forced through the material being
treated.
The base of the standard aforesaid is provided with an Anvil, whose function is to
clench the Rivet or Eylet after passage through the material.
Now it is found in practice that the Rivets or Eylets, especially if split or made of
very thin material, when set by this machine are often deformed and the work
consequently spoiled if great care be not exercised in placing the Rivets truly in the
Pocket-dies and also if the Rivets happen to be a little out of truth on their lower
edge.
This defect in the existing machines is in great measure due to the flexibility of the
aforementioned flat springs allowing the Pocket-dies to open before the Rivet or Eylet
is fairly home upon the Anvil, and in order to overcome this defect I have designed
the Improved machine, a description of which is as follows, namely:
In the accompanying Drawing
A is a Standard either of the form shewn in Fig. 2. or arranged with a horn-shaped
base as shewn in Fig. 5.
It is provided with a Lever B. arranged to work at sufficient travel to force the
vertical Plunger C. the desired distance.

page_text: The Plunger is guided in the two bosses D and D. 1. which may be sold as snewn
or provided with Caps and adjustment screws.
The lower end of the Plunger C is larger in diameter than the upper end and is
fitted with the conical-shouldered setting-punch E.
The Plunger C. however may be of equal diameter throughout its length and may
be cut away on opposite sides to permit of the slide portions G. G. hereinafter
mentioned, entering the cavities so formed.
F. F. are a pair of Rigid Jointed Levers, the upper extremities G. G. of which are
so arranged as to slide on the Plunger C, and are provided at their lower extremities
with the Pocket-dies H. H.
At K. the Levers F. F. are formed with a "half-scarfed" joint and are provided
with Bosses to increase the wearing surface.
A Taper Joint Pin L, is fitted into the Joint and is provided with a screwed Nut
and washer to compensate for any wear that may take place.
A portion of the lower Plunger C. is cut away and forms a guide in which the
Levers F. F. work. A slotted cover-plate M. is attached by two screws N. N and
serves to keep the whole in place.
The Pocket-dies H. H. are drilled to suit the shanks of the Rivets or Eylets and are
countersunk to allow the heads of the Rivets and the end of the setting Punch E. to
pass down.
The Base of the Standard is fitted with an Anvil P. of suitable form.
Around the Plunger C. is a spiral spring T. which serves to return the Plunger to
its normal position after having made a stroke.
The action of the machine is as follows namely:-
A Rivet or Eylet having been placed in the Pocket-dies H. H, the Lever B. is
pressed down and forces the Plunger C. forward, causing the Setting-Punch E. to
impinge on the head of the Rivet and force it through the material being treated and
on to the Anvil P.
Just before the head of the Rivet arrives at the shoulder Q. in the Pocket-dies H. H,
the sliding portions G. G, on the upper extremities of the Levers F. F., reach the
point R. on the Plunger C. where the larger diameter terminates.
The further travel of the Plunger C. allows the sliding portions G. G. to pass down
the inclined surface S. and on to the smaller diameter of the Plunger. Just at the
same moment, the conical shoulder on the setting Punch E. comes in contact with the
countersunk opening of the Pocket-dies, so forcing the latter apart and permitting
the Rivet head to pass through and the clenching to be completed on the underside of
the material.
Up to the point R. where the slide portions G. G. reach the termination of the
larger diameter on the plunger C, the Rivet or Eylet shank is firmly held in the
Pocket-die H. H. and kept quite true and central over the Anvil P.
All tendency of the Rivet or Eylet to "Splay out" is effectually prevented.
After the Rivet has passed through the material, it is then properly clenched upon
the Anvil P.
On releasing the Lever B. the Spring T. returns the Plunger C. to its normal
position.
The latter on its passage upwards carries the sliding portions G. G. against the
underside of the Boss D. 1. and causes them to pass up the inclined surface S. on to the
larger diameter of the Plunger, and so, through the Levers F. F. closes the Pocket-
dies H. H. ready for the insertion of another Rivet or Eylet as the case may be.
Any suitable self-feeding mechanism may be provided for automatically feeding the
Rivets or Eylets into the Pocket dies.
Fig. 1. is a front elevation an Fig. 2. a side elevation of the complete Set as
constructed.
11
Fig. 3. and 4. are detail views of the Slotted Cover Plate M.
Fig. 5. represents the Standard A arranged with Horn-shaped Base.
Fig. 6. is a plan view of the sliding portions G. G. arranged as loose attachments to
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page_text: Fig. 7. is a plan view of the Pocket-dies H. H.
Fig. 8. is an enlarged sectional view of the "Half-scarfed" Joint & taper adjust-
ment Pin in the Levers F. F.
Fig. 9. represents the sliding portions G. G. forged solid on the extremities of the
Levers F. F.
Fig. 10. shews the Plunger C. of equal diameter throughout its length and with
portions cut away on opposite sides for the purpose aforesaid.
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-
In a Tubular Rivet and Eylet Set.
1st. The application to the Plunger C. of the Rigid, Jointed Levers F. F. in
combination with the Pocket-dies H. H for the purpose specified.
2nd. The Taper Joint Pin L. in combination with the Rigid, Jointed Levers F. F
fitted with the Half-scarfed Joint and the Lengthening Bosses as shewn, for the
purpose specified.
3rd. The Plunger C. of unequal diameters or of equal diameter throughout its
length and recessed on opposite sides and provided with the inclined surface S. and
working in combination with the Rigid Jointed Levers F. F. for the purpose
specified.
4th. The Setting Punch E. provided with the conical shoulder as shewn and
working in combination with the Plunger C, the Pocket-dies H. H and the Rigid,
Jointed Levers F. F. for the purpose specified.
Dated this 5th T1007