Lamps and also for Screwing together and Unscrewing the various Parts of the same.
Year: 1885

page_text: Lamps, and also for Screwing together and Unscrewing the
various Parts of the same.
I ANDREW HOWAT, of 65 Bristol Street, Hulme, Manchester, Lancashire, Engineer,
do hereby declare the nature of said Invention for IMPROVEMENTS IN APPARATUS
FOR LOCKING AND UNLOCKING SAFETY LAMPS AND ALSO FOR SCREWING TOGETHER
AND UNSCREWING THE VARIOUS PARTS OF THE SAME, to be as follows:-
The present method of locking a safety lamp after it has been lighted is to place
a lead rivet in a projecting eye on the side of the bottom of the lamp and then to
flatten the ends of the rivet so as to retain in position a clasp fitted on the upper
part of the lamp and when it is required to open the lamp the head of the rivet is
cut off by a pair of pliers, the rivet withdrawn and the clasp released. The
bottom part of the lamp is then unscrewed from the top part by hand.
The object of my Invention is to construct a combined apparatus for locking
and unlocking safety lamps and also for screwing together and unscrewing the
various parts of the same.
To effect this I mount one part of a stamp or die in a stationary bearing on a
suitable frame or bed plate; the spindle of the other and movable part of the stamp
or die is fitted and free to slide in a bush or circular bearing beyond which the end
of the spindle projects; a spiral spring is fitted between a collar on the spindle and
a recess in the bush or bearing; near the back end of the spindle is a cam or
eccentric secured to a stud or short shaft which is mounted in suitable bearings
secured to the frame and provided with a handle by which it may be turned; on
this short shaft is also fixed a cutter which when the shaft is turned revolves over
a hole or slot in the frame or bedplate.
The lamp to be locked is placed in front of the pair of stamps or dies on a small
table the height of which may be adjusted in any convenient manner (preferably by
mounting it on a screw) so as to bring the ends of the lead or other rivet between
the dies; the handle is then turned and the shaft rotated thereby causing the
eccentric to actuate the spindle and stamp and flatten the ends of the rivet between
the dies.
When it is desired to withdraw the rivet and open the lamp the lamp is placed
on another adjustable plate or table in front of the cutter so that by rotating tho

page_text: shaft the cutter revolves and cuts off one end of the rivet and then by reversing the
lamp or placing it on the other side of the shaft the cutter catches the other end
and withdraws the rivet from the eye. The parts of the rivets when cut or with-
drawn fall down through the slot in the bedplate.
To unscrew the lamp I fix a bevel wheel on the short shaft which gears into
another bevel wheel mounted preferably above the shaft; to this second bevel
wheel is secured a block which is formed to fit into the locking screw which holds
the glass of the lamp in its place.
When the bottom of the lamp has been removed the upper part is placed on the
block which is then revolved by turning the handle of the shaft thereby unscrew-
ing the locking screw and releasing the glass and internal parts of the lamp.
Similarly by turning the handle and revolving the block in the opposite direction
the locking screw may be screwed into position again.
In some cases the parts of the machine for screwing and unscrewing the locking
screw may be mounted separately and used independently of the parts for locking
and unlocking and a cup or other device may be fitted on the block or in place of
the block so as to receive the bottom of the lamp for screwing and unscrewing the
same in a manner similar to that already described.

page_text: improvements in Apparatus for LOCking and UMROCKINg balety
Lamps, and also for Screwing together and Unscrewing the
various Parts of the same.
I ANDREW HOWAT, of 65 Bristol Street, Hulme, Manchester, Lancashire,
Engineer do hereby declare the nature of said invention for IMPROVEMENTS IN
APPARATUS FOR LOCKING AND UNLOCKING SAFETY LAMPS AND ALSO FOR SCREWING
TOGETHER AND UNSCREWING THE VARIOUS PARTS OF THE SAME, and in what
manner the same is to be performed, to be particularly described and ascertained in.
and by the following statement :-
The present method of locking a safety lamp after it has been lighted is to
place a lead rivet in a projecting eye on the side of the bottom of the lamp, and
then to flatten the ends of the rivet so as to retain in position a clasp fitted on the
upper part of the lamp and when it is required to open the lamp the head of the
rivet is cut off by a pair of pliers, the rivet withdrawn and the clasp released.
The bottom part of the lamp is then unscrewed from the top part by hand.
The object of my Invention is to construct a combined apparatus for locking
and unlocking safety lamps and also for screwing together and unscrewing the
various parts of the same.
To effect this I mount one part of a stamp or die in a stationary bearing on a
suitable frame or bed plate; the spindle of the other and movable part of the
stamp or die is fitted and free to slide in a bush or circular bearing beyond which
the end of the spindle projects; a spiral spring is fitted between a collar on the
spindle and a recess in the bush or bearing; near the back end of the spindle is a
cam or eccentric secured to a stud or short shaft which is mounted in suitable
bearings secured to the frame and provided with a handle by which it may be
turned; on this short shaft is also fixed a cutter which when the shaft is turned
revolves over a hole or slot in the frame or bed plate.
The lamp to be locked is placed in front of the pair of stamps or dies on a
small table the height of which may be adjusted in any convenient manner
(preferably by mounting it on a screw) so as to bring the ends of the lead or other
rivet between the dies; the handle is then turned and the shaft rotated thereby
causing the eccentric to actuate the spindle and stamp and flatten the ends of the
rivet between the dies.
When it is desired to withdraw the rivet and open the lamp, the lamp is placed.
on another adjustable plate or table in front of the cutter so that by rotating the
shaft the cutter revolves and cuts off one end of the rivet and then by reversing
the lamp or placing it on the other side of the shaft the cutter catches the other
end and withdraws the rivet from the eye. The parts of the rivets when cut or
withdrawn fall down through the slot in the bed plate.
To unscrew the lamp I fix a bevel wheel on the short shaft which gears into
another bevel wheel mounted preferably above the shaft; to this second bevel
wheel is secured a block which is formed to fit into the locking screw which holds
the glass of the lamp in its place,

page_text: When the bottom of the lamp has been removed the upper part is placed on the
block which is then revolved by turning the handle of the shaft thereby unscrewing
the locking screw and releasing the glass and internal parts of the lamp. Similarly
by turning the handle and revolving the block in the opposite direction the
locking screw may be screwed into position again.
In some cases the parts of the machine for screwing and unscrewing the locking
screw may be mounted separately and used independently of the parts for locking
and unlocking and a cup or other device may be fitted on the block or in place of
the block so as to receive the bottom of the lamp for screwing and unscrewing the
Bame in a manner similar to that already described.
And in order that my Invention may be fully understood and readily carried
into effect I will describe the accompanying two Sheets of Drawings, reference
being had to the figures and letters marked thereon.
Figure 1 is a side view. Fig. 2 an end view and Fig. 3 a plan with a lamp in
position ready to be locked, of a combined apparatus made according to my
Invention. Fig. 4 is a plan of the cup which fits on to the block to receive the
bottom of the safety lamp. Figs. 5 and 6 are detailed views of parts of a lamp
and of the machine. Fig. 7 is a side view and Fig. 8 a plan of an apparatus made
according to my Invention, the details being varied to adapt the machine for
locking and unlocking a lemp of slightly different construction.
Similar letters refer to similar parts throughout the several views.
Referring in the first place to Figs. 1 to 6.-a is the frame or bed plate, b is the
stationary part of the stamp or die mounted in a bearing b¹ secured to the plate a:
c is the other and movable part of the stamp or die the spindle c' of which is
fitted and free to slide in circular bearings in a hollow piece d secured to the
plate a; on the spindle c' and inside the piece d is the spiral spring e one end of
which bears against a collar on the spindle c¹ and the other against one end of the
piece d; f is the cam or eccentric mounted on the short shaft g which is supported
in the bearing i secured to the plate ɑ and provided with a handle h; there is a
slot a¹ in the plate a and on the shaft g above the slot is fixed a cutter j, and also
fixed on the shaft g is the bevel wheel which gears into a bevel wheel mounted
on a stud secured on the top of the bearing i: the block m is secured to or formed
with the bevel wheel and provided with recesses m¹ which correspond with
projections (not shown) on the interior of the locking scrow of the safety lamp
and also with similarly shaped projections n¹ formed at the bottom of the cup n
(shown full size, Fig. 4), the cup n is formed to receive the bottom of the lamp o
and is provided with slots n², one of which receives the eye o¹ which is fixed on
the bottom part of the lamp o while the clasp p is hinged as usual on a ring p¹
fitted loosely on the frame above the bottom part of the lamp: q q' are two small
adjustable tables each of which is mounted on a screwed spindle q which passes
through the bottom of the frame and is secured by a lock nut q: there is a small
hand wheel q* secured to each table by turning which the height of the tables q q¹
may be adjusted. For the class of lamp illustrated by the Drawings it is
convenient to use a loose plate q' held in its proper place by two pins q which
take into holes in the plate a, and a block or gauze extractor r,
which may be
fixed on any convenient part of the plate a.
When the table q has been adjusted to the proper level by means of its hand
wheel q the lamp o is put on the table q fronting the dies b and c as shown in
Fig. 3, the clasp p being turned down over the eye o¹ in which is placed a lead
rivet s the ends of which come between the dies band c. The lamp o is then
locked by turning the handle h and causing the cam f to move the spindle c¹ and
die c toward the stationary die band so to flatten the ends of the rivet & against the
sides of the eye o' thereby securing the clasp p in place and locking the lamp.
The lamp is unlocked by placing it on the plate q with one side of the clasp in
front of the cutter j, the handle h is then turned to rotate the cutter j and cut off
one end of the rivet s, then by placing the lamp at the other end of the plate q
with the other side of the clasp in front of the cutter j. and turning the handle h in

page_text: the opposite direction the cutter catches the head or other end and withdraws the
rivet 8 from the eye o¹, the severed parts of the rivet falling down through the
slot a¹.
To take the lamp to pieces the clasp 'p is raised and the bottom of the lamp
placed in the cup n, on the block m, the eye o¹ taking into one of the slots n³,
(see Figs. 2, 5 and 6). The shaft g is then turned by means of the handle h and
as the wheel k revolves it drives the wheel and the block m and so causes the
cup n to turn and unscrew the bottom from the top part of the lamp. The cup n
with the bottom part of the lamp is then removed from the block m and the lamp
placed on the block m, the recesses m² on which receive the corresponding
projections formed on the interior of the locking screw as already described so that
by turning the handle h and causing the block m to revolve the locking screw is
unscrewed and the glass and other internal parts of the lamp are released. The
wire gauze lining may then be readily removed by placing the lamp on the block 7,
the gauze remaining on the block r when the lamp is withdrawn.
By replacing the parts of the lamp and reversing the process above described
the locking screw and the bottom of the lamp may be again screwed into position.
When the bottom part of the lamp is locked by a screw instead of a lead or
other soft metal rivet s I fix a slotted key t, see Fig. 3, in the end of the shaft
and I dispense with the oval plate q and place the lamp directly on the table q¹
the height of which is adjusted by the wheel q'. The head of the screw rests in
the slotted key t so that by turning the handle h and revolving the shaft g the
screw is removed and the lamp unlocked.
Figs. 7 and 8 are views of the apparatus adapted for locking and unlocking
lamps in which a lead or other soft metal rivet is inserted vertically into two eyes,
one being on the bottom of the lamp, the other being on the loose ring p¹ and
taking the place of the clasp p. The position of the stationary die b is varied as
shown and the other and movable die c is mounted on one end of a lever u
fulcrumed at u¹; the other end of the lever u rests on the cam f and a spiral
.spring us is connected at one end to the lever u and at the other to the plate a.
On the other side of the shaft g and as an equivalent for the cutter j I mount in a
hollow block or bearing w secured to the plate a, a sliding or reciprocating lever x,
one end of which is kept constantly in contact with the cam f by a spring (not
shown) and the other end is forked or divided, the upper extremity having a
cutting edge and being rather longer than the lower extremity ³; y is a stop
piece secured to the plate a.
To lock the lamp it is placed on the table q which is adjusted to the proper level
so that one end of the rivet rests on the die 6 and when the handle h is turned and
the cam f revolved one end of the lever u is raised and the other with the die c
depressed thereby flattening the ends of the rivet and locking the lamp or securing
the two eyes together.
To unlock the lamp it is placed on the table q¹ with one side of the eyes resting
against the stop piece y so that by turning the handle and rotating the cam f the
lever is moved, the cutter x cuts off one end of the rivet and the lower extremity
extracts the rivet and unlocks the lamp.
The parts of the lamp are unscrewed in the manner described with reference to
Figs. 1 to 6.
It is of course necessary to alter the size and shape of the slots n³ on the cup n
according to the different construction of lamp so that the cup n can receive the
bottom of the lamp.
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 construction, combination, and arrangement of parts forming the
apparatus for locking and unlocking and screwing and unscrewing safety lamps,

page_text: substantially in the manner and for the purposes herein described and as illustrated
by Figs. 1 to 6 of the Drawings annexed.
2. The construction, combination, and arrangement of parts forming the
apparatus for locking and unlocking and screwing and unscrewing safety lamps,
substantially in the manner and for the purposes herein described and illustrated
by Figs. 7 and 8 of the Drawings annexed.
H. B. BARLOW,
Agent for Applicant,
4, Mansfield Chambers,
17, St. Ann's Square, Manchester.