AN IMPROVED SAFETY-ROD OR PIN-FASTENER.
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by Isac Louis Pulvermacher at the Office
of the Commissioners of Patents on the 30th March 1880.
ISAC LOUIS PULVERMACTER, of 194, Regent Street, in the County of Middlesex,
Electrician. "AN IMPROVED SAFETY-ROD OR PIN-FASTENER.'
"
The object of the present Invention is an appliance or safety pin fastener, whose
essential features are hollow bolts. This appliance is designed for the purpose of
covering or enclosing the ends or points either of pins or of stems or rods of various
lengths, so as to secure these said pins, stems, or rods in the position they have been
caused to occupy, and to protect the person wearing them from contact with the
points of these pins, stems, or rods, which latter may be either, 1, removable and
independent of the appliance or fastener; 2, attached and hinged on to the appliance;
3, and finally, the pins, stems, or rods may be fixed or attached to certain objects,
such as tissues, cloth, and others, which are to be joined together.
My hollow bolt appliances may be varied in shape or size according as to whether
it is required to cover the ends of straight or curved pins, stems, or rods; also
according to the various uses to which my hollow bolt appliances may be applied,
whether to articles of dress or wearing apparel, for toilet purposes, to jewelry,
brooches, sleeve links, studs, and buttons of all kinds; also for binding or fastening
invoices and bills, letters, and other papers, and in fact for all the various uses and
applications to which my appliances may be put.
The appliance consists of a thin metal plate cut and stamped out at one operation
by means of dies and punchies suitably arranged to produce or form the various
parts necessary for the action of the hollow bolts.
These hollow bolts are formed in the same manner, that is to say, by cutting out
and stamping.
A metal plate is provided all round with a raised edge forming a shell. It is
fitted with two bridge pieces cut in the metal plate and punched out in the stamping
in such a manner as to permit the introduction of the hollow bolts under the bridge
pieces, and to allow of the sliding to and fro motion of these bolts between the
bridge pieces and the metal plate or base of the shell.
The hollow bolts have cach a handle or extension piece, which is passed through
a hole or aperture formed in the turned up edge of the shell, after which the ends
of the handle or extension piece is raised or turned up to serve as a guard or as a

page_text: hold for giving the to and fro motion to the hollow bolt which is necessary for the
action of the appliance.
The handle or extension piece has a small tooth or catch which can pass through
the hole or aperture into the interior of the raised edge of the shell, to servo as a
stop piece to the hollow bolt and prevent the latter receding when a pin is
enclosed.
When the pin is to be disengaged by drawing the hollow bolts apart the end of
the handle or extension pieco is lightly pressed upon, when the latter, acting as a
spring, will release the tooth or catch from the hole or aperture, and the hollow bolt
is withdrawn by the handle or extension piece.
The hollow bolts form grooves, and in transverso section they have the form of
an inverted U, which permits them to be made by stamping, this being an important
condition in the construction of my appliance, as they may thus be made with
exactness and cheaply.
When cutting out the metal plates I also cut out tonguo pieces on three sides, and
raise them at right angles on the fourth side, thus forming openings.
The tongue pieces which are in the axis of the hollow bolts have a concave shapo
--on-the-upper edges, which allows the piu to be enclosed to place itself in proper
position in front of the hollow bolts when the appliance is about to be used, and one
of the ends of the pin is placed in one of the hollow bolts.
The openings enable the pin to be seen, which is then found to be under the
appliance.
Instead of the to and fro motion of the hollow bolts being effected by hand, as
previously described, this motion may be caused automatically and simultaneously
in several ways, and, for example, by means of a small plate rivetted to the outer
face of the shell. For this purpose the handles or extension pieces of the hollow-
bolts are bent so as to penetrate into slots placed excentrically to the pivot or point
of rivetting, so as to simultaneously impart the required movement to both the
hollow bolts.
According to another modification I construct an apparatus arranged to act with
a single sliding bolt. In this case the bridge picco opposite the sliding bolt takes
the place of the other bolt. This bridge piece is closed in on one side to receive and
enclose one end of the pin or stem to be enclosed, whilst the single bolt acts on the
other end.
According to another modification I construct an appliance with iny hollow bolts
arranged on a circular plate, but which may be made of any convenient shape, plain
or ornamented.
This plate is provided on one of its two faces with a raised or turned up edge all
round, or with feet or raised pieces opposite the hollow bolts only.
The hollow bolts, which act in a similar manner to the preceding by sliding to
and fro under bridge pieces, may be of a variable number (four, for example) to
enclose two pins or rods placed crosswise on the object which is to be joined or
fastened to the plate. The pins or rods may be replaced by hooks or tongues made
to project from a backing.