Improvements in or in connection with Cameras.
Year: 1893

page_text: Date of Application, 31st Aug., 1893
Complete Specification Left, 29th May, 1894-Accepted, 30th June, 1894
PROVISIONAL SPECIFICATION.
Improvements in or in connection with Cameras.
I FREDERICK WOODWARD BRANSON of Commercial Street Leeds in the
County of York Pharmaceutical Chemist and Scientific Instrument Manufacturer
do hereby declare the nature of this invention to be as follows:-
My invention refers in the first place to means for strengthening and stiffening
the sliding carrier used for carrying the front (sometimes however the back) of the
camera, whilst keeping the carrier as light as possible. This carrier is formed as a
rectangular open frame, the camera front (or back) being attached to one end;
and the toothed racks, by means of which the carrier is moved, are attached to
the two sides of the frame. These two sides are formed with rabitted or grooved
outer edges to fit corresponding grooves or rabits in the side pieces of the camera
base; whilst the rack is affixed on the upper or under part of the side of the
carrier frame.
Now in my invention I form the racks with a backing 1, L or U (i.e. channel)
shaped in section, the height of the backing being approximately equal to the
thickness of the carrier frame sides. The inner edges of the frame sides (if
required) are correspondingly grooved or rabited to fit the backing of the rack,
and the backing is secured to the frame sides by means of screws or nails.
In the second place my invention refers to means for ensuring a smooth and
steady motion of the carrier. This I effect by giving an inclined direction to the
teeth of the racks, and forming the teeth of the pinion correspondingly spiral; so
that at least two or more of the teeth of a rack are always in gear with the teeth
on the pinion. The reaction between the pinion and the rack is thereby rendered
perfectly uniform, and the working smooth and steady.
My invention further refers to means for steadying and securing the camera
front laterally in position on the front side of the carrier frame. The camera front
is usually fitted to the carrier frame by means of two cheese or square headed
studs, which slip into grooves in the frame, covered with slotted metal plates. To
steady and secure the camera front laterally, I provide a sliding bolt at one (or
both) of the lower corners of the camera front frame, which bolt drops into a bolt
hole formed in one of the above mentioned slotted metal plates.
Dated this 30th day of August 1893.
J. CLARK JEFFERSON,
2, East Parade, Leeds, Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in or in connection with Cameras.
I FREDERICK WOODWARD BRANSON of Commercial Street Leeds in the
County of York Pharmaceutical Chemist and Scientific Instrument Manufacturer
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 :-
My invention refers in the first place to means for strengthening and stiffening
the sliding carrier used for carrying the front (sometimes however the back) of the
camera, whilst keeping the camera as light as possible. This carrier is formed as
a rectangular open frame, the camera front (or back) being attached to one end

page_text: and the toothed racks by means of which the carrier is moved are attached to the
two sides of the frame. These two sides are formed with rabited or grooved outer
edges to fit corresponding grooves or rabits in the side pieces of the camera base,
whilst the rack is affixed on the upper or under part of the side of the carrier
frame.
Now in my invention I form the racks with a backing 1 L or U (i.e. channel)
shaped in section, the height of the backing being approximately equal to the
thickness of the carrier frame sides, the inner edges of the frame sides (if required)
are correspondingly grooved or rabited to fit the backing of the rack, and the
backing is secured to the frame sides by means of screws or nails.
In the second place my invention refers to means for ensuring a smooth and
steady motion of the carrier. This I effect by giving an inclined direction to the
teeth of the racks, and forming the teeth of the pinion correspondingly spiral; so
that at least two or more of the teeth of the rack are always in gear with the
teeth on the pinion, and the reaction between the pinion and the rack is thereby
rendered perfectly uniform and the working smooth and steady.
My invention further refers to means for steadying and securing the camera front
laterally in position on the front side of the carrier frame. The camera front is
usually fitted to the camera frame by means of two cheese or square headed studs,
which slip into grooves in the frame covered with slotted metal plates. To steady
and secure the camera front laterally I provide a sliding bolt at one (or both) of
the lower corners of the camera front frame, which bolt drops into a bolt hole
formed in one of the above mentioned slotted plates.
And in order that my invention and the manner in which the same is to be
performed may be more readily and clearly understood, reference is given to the
accompanying sheet of drawings in which
Fig. 1 is a plan of the sliding carrier and base piece of a camera constructed in
accordance with my invention; Fig. 2 is a side elevation, and Fig. 3 a front
elevation of the same; whilst
Fig. 4 is a cross section on line A B, Figs. 1 and 2.
In all the figs. the same reference letter refers to the same or corresponding
part.
a is the rectangular frame forming the sliding carrier.
bis the camera base.
c are the toothed racks attached to the underside of the side pieces of the
carrier frame. Hitherto these racks have been formed plain rectangular in section
as illustrated in Fig. 5. Now in my invention for the sake of strengthening the
frame and preventing the same from bending, I make the racks of any of the
sections or U illustrated in Figs. 6, 7, 8 and 8^, and groove or rabit the inner
edges of the frame sides a to correspond. The racks are secured to the frame
sides by means of screws as shewn in Fig. 6.
d is the long pinion gearing with the racks c. The teeth of the pinion as shewn
in Fig. 1, are formed spirally and the teeth of the rack inclined to correspond as
shewn in Fig. 2. It will be evident that if the twist of the spiral be sufficiently
quick, and the teeth of the rack sufficiently wide, that owing to a succeeding tooth
of the rack coming in contact with the corresponding tooth of the rack (at one
side of the rack) before the previous tooth has passed out of contact with its rack
tooth (on the opposite side), a uniform or rather constant pressure is exerted ou the
rack by the pinion instead of an irregular or intermittent pressure, so that the
motion is regular and uniform or smooth and steady instead of taking place as at
present by a succession of jerks.
e are the cheese headed studs fixed to the bottom of the camera front f, (shewn
in dotted lines Fig. 3), which drop through the enlarged parts of the slot holes gin
the metal plates k on the top side of the front end of the carrier frame. On
pushing the camera front to one side the heads of the studs catch beneath the plate
in the narrow parts of the slot holes g. In order to steady and lock laterally the
camera front in this position I provide the vertical sliding bolt h, fixed to the side

page_text: of the camera front, the lower end of which bolt drops into a hole i in one of the
plates k.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1st. The method or means of strengthening the longitudinal sides of the sliding
carrier by forming the toothed racks with a metal rib or backing and securing the
same to the said sides substantially as herein set forth.
2nd. The method or means of securing a steady motion of the sliding carrier by
forming the teeth of the pinion in a spiral manner and inclining the teeth of the
rack to correspond substantially as herein set forth.
3rd. The method or means of securing and steadying the camera front laterally
as well as vertically in position by a vertical sliding bolt (or bolts) attached to the
side of the camera front and arranged to drop or shoot into the hole i in the slotted
plate on pushing the camera front to one side, so as to lock it vertically
substantially as herein set forth.
Dated this 28th day of Mar 1894
J. CLARK JEFFERSON,
2, East Parade, Leeds, Agent for Applicant.