Improvements in Adjusting Photographic Cameras and other like Apparatus or Instruments.
Year: 1888

page_text: Date of Application, 19th Dec., 1888
Complete Specification Left, 18th Sept., 1889-Accepted, 30th Nov., 1889
PROVISIONAL SPECIFICATION.
Improvements in Adjusting Photographic Cameras and other like
Apparatus or Instruments.
We EDMOND PERKEN FREDERIC LOUIS PERKEN & ARTHUR RAYMENT trading as
Perken Son & Rayment of 99 Hatton Garden in the City of London Manufacturers
and CHARLES GEORGE NORTH of 41 Hamfrith Road Stratford in the County of Essex
Optician do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the rack and pinion adjusting gear used
for drawing in and out the bellows of a photographic camera or as used with other
scientific instruments such as enlarging and copying lanterns microscopes and the
like instruments and apparatus which require adjustment for focussing or other
purposes and is designed to expedite such adjustment.
For this purpose we use a pinion which gears with a rack in the ordinary or any
suitable way and we make a part or parts of such pinion of a smaller diameter than
the rest (and advantageously smooth) and also the pinion is made to move laterally so
that it may be pushed in or drawn out a little so as to bring the smaller part over the
rack or racks and thus throw the same out of gear and the part of the instrument or
apparatus to which the rack (or the pinion) is attached may then be moved out or in
freely by hand and then the pinion is thrown into gear again and the exact and
usually slow adjustment proceeded with in the usual manner.
Dated this 19th day of December 1888.
TONGUE & BIRKBECK,
34, Southampton Buildings, London, W.C., Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Adjusting Photographic Cameras and other like
Apparatus or Instruments.
We EDMOND PERKEN, FREDERIC LOUIS PERKEN and ARTHUR RAYMENT trading
as Perken Son and Rayment of 99 Hatton Garden in the City of London Wholesale
Opticians and CHARLES GEORGE NORTH of 41 Hamfrith Road Stratford in the County
of Essex Optician 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:
-
This invention relates to improvements in the rack and pinion adjusting gear used
for drawing in and out the bellows or other part of a photographic camera or as used
with other scientific instruments such as enlarging and copying lanterns microscopes
and the like instruments and apparatus which require adjustinent for focusing or
other purposes and is designed to expedite such adjustment.
For this purpose we use a pinion which gears with a rack in the ordinary or any
suitable way and we make a part or parts of such pinion of a smaller diameter than
the rest (and advantageously smooth) and also the pinion is made to move laterally so
that it may be pushed in or drawn out a little so as to bring the smaller part or parts
over the rack or racks (or vice versa) and thus throw the same in or out of gear and
the part of the instrument or apparatus to which the rack (or the pinion) is attached
may then be moved out or in freely by hand-and then the pinion is thrown into
gear again and the exact and usually slow adjustment proceeded with in the usual
manner.
It will be obvious that this pinion-with the recessed part or parts thereon and
moving laterally into or out of gear with a rack or racks can be applied in a variety
of ways in actuating certain parts of the hereinbefore mentioned apparatus for

page_text: instance the pinion while always actuating one or more racks is out of gear
with another rack or racks with which latter it is thrown into gear as before
described at any desired time, or the sinaller parts on the pinion are arranged
so that when the latter is moved laterally as, before described it will throw out of gear
with one or more racks and at the same time be thrown into gear with another rack
or racks attached to different working parts of the apparatus or instrument and in
such arrangements either gearing or ceasing to gear all at once with the racks or
being thrown in or out of gear with one or more racks consecutively as desired.
And in order that this invention may be easily understood and readily carried into
practice we will proceed to describe the same with reference to the accompanying
sheet of drawings.
Figure 1 is a side elevation of an instrument or apparatus having our present
improvements applied thereto-the instrument shown for the purpose of illustration
being a photographic camera.
Figure 2 is a front elevation of same part being in section.
Figure 3 is a plan of same-parts being removed in order to more plainly illustrate
the invention.
Figures 4 and 5 show separate views of the rack and pinion and
Figures 6 and 7 show other arrangements of the pinion and racks thereon.
Similar letters of reference indicate corresponding parts throughout.
Referring to Figures to 5 any suitable milled head (or the like) such as a is
attached or formed on the pinion & for the purpose of revolving the latter as is well
understood.
On this pinion 6 two parts of smaller diameter cc are formed and this pinion b is so
arranged and mounted that it is capable of moving laterally in its bearings as shown
and also it gears or meshes with the two racks d d respectively attached to the sliding
guides fixed to the front or other part of the camera.
b
By laterally moving the pinion 6 by means of the head a into the position shown in
dotted lines at Figure 2 it will be seen that the smaller diameter parts cc of the
pinion b would be brought directly under the racks d d respectively thus throwing the
racks and pinion out of gear and then the parts of the camera to which the racks
are attached (or the parts in which the pinion 6 is carried) may be readily and freely
drawn out or pushed in-after which the pinion is laterally moved back again and
thereby thrown into gear again to give the slow adjustment as desired.
In Figure 6 this invention is shown adapted so that it is always in gear with the
two (or it may be one or more) racks d¹ d¹ fixed on one or more parts of an apparatus
or instrument while the rack d' attached to another part of the apparatus is normally
out of gear with the pinion 6 by reason of the groove or part of smaller diameter c
which rack can be thrown into gear with the pinion at any desired moment by
laterally moving the said pinion b in the direction of the arrow & without throwing
the other rack or racks out of gear and in like manner two or more racks d
(attached to different parts of an apparatus) can be thrown in or out of gear either
consecutively or all together as desired.
On the contrary the recessed parts c on the pinion b and the several racks may be
arranged as in Figure 7 so that when one rack (or racks) d' is thrown out of gear
another rack (or racks) d is thrown into gear and when more than two racks are
employed they may each successively or several at once be thrown in or out of
gear.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
In photographic cameras and other like apparatus or instruments we claim the
pinion having one or more parts c of smaller diameter formed thereon arranged and

page_text: acting in conjunction with a rack or racks such as d attached to some other parts of
the apparatus substantially in the manner and for the purposes herein before described
and illustrated in the drawings hereunto annexed.
Dated this 18th day of September 1889.
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Patentees.