IMPROVEMENTS IN MACHINERY FOR THE REGISTRATION OF THE NUMBER OF PERSONS ENTERING OR LEAVING OMNIBUSES, TRAM CARS, OR OTHER VEHICLES, OR THEATRES, PUBLIC OR OTHER BUILDINGS, GARDENS, OR OTHER PLACES."
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by John Calvert at the Office of the
Commissioners of Patents on the 12th May 1877.
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JOHN CALVERT, of Number 99, Great Jackson Street, Hulme, in the City of
Manchester, Mechanical Engineer. IMPROVEMENTS IN MACHINERY FOR THE
REGISTRATION OF THE NUMBER OF PERSONS ENTERING OR LEAVING OMNIBUSES,
TRAM CARS, OR OTHER VEHICLES, OR THEATRES, PUBLIC OR OTHER BUILDINGS,
GARDENS, OR OTHER PLACES."
The Invention consists of machinery constructed on bearings in a detached form,
which may be affixed and removed as a whole to the sides, top, or bottom of any
doorway, passage, or gateway.
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The principle or object of the Invention is to register the number of persons
entering or leaving omnibuses, tram cars, or other vehicles, or theatres, public or other
buildings, gardens, or other places, so that none can pass or repass without the
machinery communicating with an indicator or tell-tale to be connected therewith.
The means by which this is to be carried into effect are by peculiarly shaped barriers
or arms, which may be either doors, gates, or bars, affixed to separate shafts working
either up or down the sides of the doorway, passage, or gateway, in connection with
a motion which may be fixed either at the sides of, or at the top or bottom, of the
doorway, passage, or gateway. Such motion is a slide or slides so proportioned as
to be acted upon by cams, arms, eccentrics or other projection fixed on the shafts.
Each slide in its original or resting position is between the cams, and to such
position after being moved it is brought back by a spring.
When the barriers are opened the shafts move or extend the slide or slides which
communicates with and registers on the indicator or tell-tale. The barriers, which
move by a double action, are so shaped and connected that when one of them is
opened sufficiently to admit the passage of one person the other barrier is thereby
necessarily moved crosswise so as to block the passage and prevent more than
one person passing at a time, and each movement of the barriers is recorded by the
indicator or tell-tale.
The block of the barriers may be further secured by a peg projecting through the
slide into a notch, which would require the entire machinery to be restored to its

page_text: original or starting position after every registration on the indicator or tell-tale.
On this being done the peg would, by means of a spring, be released from the notch.
The slide and cams where they come in contact may be either square, curved, or
oblique, or in straight or curved lines at varied angles to gain the different lengths
of stroke or movement required.
The locking connection between the shafts can also be effected with levers or
eccentrical arrangements with an inclined plance, either with or without the slide, or
by an arrangement of all of them.
The machinery can be readily adapted on the same principles so as to be applicable
to stairs or ladders to the top of an omnibus, tram car, or other vehicle or building.