Quickly Changing Slides in Magic Lanterns.
Year: 1887

page_text: Quickly Changing Slides in Magic Lanterns.
I WALTER JOSEPH COLES of 38 Hanover Park, Peckham, in the County of Surrey,
Engineer, do hereby declare the nature of my invention for IMPROVEMENTS IN SELF
CENTREING SLIDE CARRIERS and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
My invention relates to improvements in Slide carriers by means of which, the slides,
of whatever length are centred, and passed on without interfering with the succeeding
slide; and also relates to a stop so constructed, as to automatically prevent, the slide
being introduced into the carrier from disturbing the one being exhibited.
In order that the invention may be more readily understood, I have illustrated it in
the accompanying drawings forming part of this specification of which the following is
the description:-
Fig. 1 is a front elevation of the carrier, Fig. 2 is an end elevation, and Fig. 3 is a
plan with the upper part of the frame removed in order to show the arrangements
more clearly.
The same letters indicate the same parts in all figures.
The carrier consists of a frame A having two strips B, B', grooved to allow a slide,
either with or without a carrier, to slide freely therein.
The lever C which is centred at N, has the sliding stop E coupled to one end of it.
This stop slides upon pin F, as lever is moved backwards or forwards, and has a
projection M formed at the end of it. The automatic lever stop G is centred at H, and
so long as I is pressed down, the end J rises and blocks the groove. The slip L which
can be slid in and out, has a projection K formed on it, for the purpose of pushing the
slides in, and actuating lever C."
The action of the various parts is as follows:-
Slip L being drawn out as shown by dotted lines, a slide is placed in the grooves in
front of projection K, it is then pushed in and K comes in contact with end D of
lever C, which is carried with it; the lever moving on fulcrum N draws the sliding
stop E to meet the slide, until the projection M comes into contact with it, at which

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point the slide is locked between the projections K and M; and the slide, whatever its
length, will be central with the opening in frame A.
Upon drawing the slip out, the lever, and consequently the stop M is free to move.
Slide No. 2 is now inserted into the grooves, in the same manner as No. 1, and
being pushed forward comes in contact with slide No. 1 which is pushed along carrying
stop M E before it, until E rising upon pin F, to the position shewn by fine dotted
lines, leaving groove in B clear for the passage of the slide, which being still pushed
along falls down step in groove B¹, and leaves room for the stop M to move to meet
slide No. 2. The projection K having by this time reached lever C, the action already
described is repeated.
The slide No. 1 still being in the grooves rest on end I of lever G, which moving on
fulcrum H causes projection J to rise and block the groove of B¹ to the passage of
slide No. 3 which may now be inserted into the carrier, the slip L having been drawn
out, but cannot be pushed in on account of slide No. 3 coming in contact with projec-
tion J, until slide No. 1 has been withdrawn from the grooves, when end I of
lever Grises and J falls clear.
For making the changes with greater rapidity a lever either simple or compound (if
simple it is made in one piece shaped thus, if compound it assumes the same shape,
the difference being that it is made in two pieces in order to give greater leverago);
the fulcrum of which is at the angle and is fixed on the upper portion of the frame
at the end at which the slides are inserted. This lever thus fixed takes the place
of slip L.
A spring tends to keep this lover in such a position as to permit slide being
introduced, thus ; and the slide having been inserted into frame, the whole
operation is performed by merely applying pressure to its upper extremity; the
projection on the lower extremity comes in contact with the slide, and acts in
exactly the same manner as the projection K on slip L; and upon relieving the
pressure, the spring brings. the lever into its first position again ready for the insertion
of the next slide.
Having now particularly described and ascertained the nature of the said invention,
and in what manner the same is to be performed, I declare that what I claim is :-
1st. The combination of lever and sliding stop, as herein set forth and described, for
automatically centreing slides, and by means of which they are allowed to pass in one
continuous direction.
2nd. The automatic lever stop, for preventing inadvertent disturbance of the slide
being exhibited, as herein described.
3rd. The general combination of mechanism herein described and shown in
drawings.
4th. The combination of the lever motion for rapidly changing the slides, with the
automatic centreing lever and sliding stop, as herein substantially set forth.
Datod this 31st day of March 1887
WALTER JOSEPH COLES.