DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.62828#0582
(. 4'2° )
compliih this, I have given a perfpedtive view of the whole
machinery at No. i. Suppoflng the till to be taken out, and the
fly-brackets and inner lining away from the framing; a b is an
upright iron axis, made in two parts, and connected together
by a round pin at the joint by of courfe, if the winch c be
turned round, the axis a will turn round with it by the above
pin, without moving the lower part of the axis b. Whence it
is evident, that if the winch c be fere wed to the under edge of
the fly-bracket, which bracket is fliewn in the defign, it will
turn round without affedting any part of the machinery. This
is the caufe why the flap of the top can be up whilft the till is
down. But if the fquare focket a be prefled down paft the joint
b, the two parts of the axis will then be confined together, and
therefore if the winch c be moved this way, it is evident that
the machinery will inftantly be put in motion in the following
manner:
The winch c being fcrewed to the fly-bracket, and turned
fquare out, it defcribes by its paflage a quadrant of a circle; and
the arm r of the crank-rod being fixed faft into the fame axis
a b, confequently it will defcribe the fame curve as the bracket:
and as the crank-rod R is jointed into its arm at j and at Z, in
moving the arm the rod R is pufhed forward to y, and the hori-
zontal cog-wheel H of courfe turns to the left-hand on the cen-
ter C. It being then turned to the left, as exprefled by the
, dotted
compliih this, I have given a perfpedtive view of the whole
machinery at No. i. Suppoflng the till to be taken out, and the
fly-brackets and inner lining away from the framing; a b is an
upright iron axis, made in two parts, and connected together
by a round pin at the joint by of courfe, if the winch c be
turned round, the axis a will turn round with it by the above
pin, without moving the lower part of the axis b. Whence it
is evident, that if the winch c be fere wed to the under edge of
the fly-bracket, which bracket is fliewn in the defign, it will
turn round without affedting any part of the machinery. This
is the caufe why the flap of the top can be up whilft the till is
down. But if the fquare focket a be prefled down paft the joint
b, the two parts of the axis will then be confined together, and
therefore if the winch c be moved this way, it is evident that
the machinery will inftantly be put in motion in the following
manner:
The winch c being fcrewed to the fly-bracket, and turned
fquare out, it defcribes by its paflage a quadrant of a circle; and
the arm r of the crank-rod being fixed faft into the fame axis
a b, confequently it will defcribe the fame curve as the bracket:
and as the crank-rod R is jointed into its arm at j and at Z, in
moving the arm the rod R is pufhed forward to y, and the hori-
zontal cog-wheel H of courfe turns to the left-hand on the cen-
ter C. It being then turned to the left, as exprefled by the
, dotted