IMPROVEMENTS IN MACHINERY OR APPARATUS EMPLOYED IN BEVELLING GLASS
Year: 1882

page_text: LETTERS PATENT to Thomas Parsonage of Hemingford Road, Barnsbury, in
the County of Middlesex for an invention of IMPROVEMENTS IN MACHINERY
OR APPARATUS EMPLOYED IN BEVELLING GLASS.
PROVISIONAL SPECIFICATION left by the said Thomas Parsonage at the
Office of the Commissioners of Patents on the 12th April 1882.
THOMAS PARSONAGE of Hemingford Road, Barnsbury in the County of Middlesex
"IMPROVEMENTS IN MACHINERY OR APPARATUS EMPLOYED IN BEVELLING GLASS"
The Invention has for its object improvements in machinery or apparatus
employed in bevelling glass and relates to that class of machinery in which tho
glass is supported on a travelling table which is capable of adjustment from the
horizontal to any required bevel and in which the grinding or polishing wheel is
mounted on a vertical axle.
My Invention consists in the application to such class of machines of a new
feeding mechanism whereby the travelling table after travelling the required
distance in either direction has its motion automatically reversed.
For this purpose I employ a long screw cut with a right and left handed thread
along its entire length; into these threads is fitted a follower formed somewhat
like a crescent on the end of a short spindle to which spindle is fixed a quadrant
and between this and the crescent shaped follower works a weighted lever which
is thrown over from one side to the other by means of tappets fixed at the
required distances on a bar extending the whole length of the screw so that an
automatic feed backwards and forwards is obtained by the tappets throwing over
the lever which throws the crescent shaped follower alternately into the right or
left hand thread.
The follower short spindle, crescent and weighted lever are fitted by a hinge
joint to a bracket fixed to the travelling table so that by withdrawing a bolt
the follower may be caused to fall out of gear with the screw thereby setting the
travelling table free.

page_text: To prevent the screw sagging I employ a quadrant or other shaped lever to
which a bearing is hinged at each end and botween which bearings the lever is so
shaped as to allow the aforesaid bracket to pass. Beneath the said bracket is a
stud or roller which when the travelling table is about to pass the centre of its
course, enters a groove formed in a projection on the face of the quadrant or
other shaped screw supporting lever and gradually passes the said lever and its
scrow bearings or supports over from one side to the other so as to carry one
of such bearings out of position and the other into position for supporting the
screw after which the stud or roller becomes free; the screw supporting lover is
hinged to a base plate.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Thomas Parsonage in the Great Seal Patent Office on the
12th October 1882.
THOMAS PARSONAGE of Hemingford Road Barnsbury in the County of Middlesex
'IMPROVEMENTS IN MACHINERY OR APPARATUS EMPLOYED IN BEVELLING GLASS
"
This invention has for its object improvements in machinery or apparatus
employed in bevelling glass and relates to that class of machinery in which the
glass is supported on a travelling table which is capable of adjustment from the
horizontal to any required bevel and in which the grinding or polishing wheel is
mounted on a vertical axle.
.
My invention consists in the application to such class of machines of a new
feeding mechanism whereby the travelling table after travelling the required
distance in either direction has its motion automatically reversed.
For this purpose I employ a long screw, cut with a right and left handed thread
along its entire length; into these threads is fitted a follower formed some what
like a crescent on the end of a short spindle to which spindle is fixed a quadrant
and between this and the crescent shaped follower works a weighted lever which
is thrown over from one side to the other by means of tappets fixed at the required
distances on a bar extending the whole length of the screw so that an automatic
feed backwards and forwards is obtained by the tappets throwing over the lover
which throws the crescent shaped follower alternately into the right or left hand
thread. The follower, short spindle quadrant and weighted lever are fitted by a
hinge joint to a bracket fixed to the travelling table so that by withdrawing a bolt
the follower may be caused to fall out of gear with the screw thereby setting the
travelling table free.
To prevent the screw sagging I employ a quadrant or other shaped lever to
which a bearing is hinged at each end and between which bearings the lever is so
shaped as to allow the aforesaid bracket to pass. Beneath the said bracket is a
stud or roller which when the travelling table is about to pass, the centre of its
course enters a groove formed in a projection on the face of the quadrant or other
shaped screw supporting lever and gradually passes the said lever and its screw
bearings or supports over from one side to the other so as to carry one of such
bearings out of position and the other into position for supporting the screw after
which the stud or roller becomes free; the screw supporting lever is hinged to a
base plate.
And in order that the said invention may be more clearly understood and readily
carried into effect I will proceed aided by the accompanying Drawings more fully
DESCRIPTION OF THE DRAWINGS.
Figure 1 is an end elevation Figure 2 is a side elevation and Figure 3 a plan of
machinery or apparatus constructed according to my invention. Figures 4. 5
and 6 aro respectively an end view a front view and a plan drawn to an enlarged
scale of the reversing gear separately and Figure 7 is an end view of the same
shewing the parts thrown out of gear.
a is a bed supported by the carriage b which by running to and fro on rails c.
carries the glass to be bevelled first in one direction and then in the other past the
grinding or polishing wheel & which latter is mounted on a vertical axis and
receives motion in the usual manner.
The bed a. is hinged towards its front edge to the rail c. and at its back it rests
on the rail e'. and such rails c. c. are carried at the upper ends of screwed rods f. f.
working in nuts formed in the centre of worm wheels g which latter are operated
by worms h¹. formed or fixed on shafts h which by means of the hand wheels h².
are rotated in one or the other direction in order to raise or lower the rods f. f. as

page_text: required to obtain the desired bevel. The apparatus heretofore described forms
no part of my present invention which consists in the application to such class
of machines of a new feeding mechanism whereby the travelling bed a after
travelling the required distance in either direction has its motion automatically
reversed.
For this purpose 1 employ a long screw cut with a right and left handed
thread along its entire length. This screw i is mounted in fixed standards or other
supports and has mounted at one end thereof a fast and a loose pulley . . by
which it is driven.
Into the threads of this screw i is fitted a follower formed somewhat like a
crescent on the end of a short spindle k to which spindle is fixed a quadrant.
and between this and the crescent shaped follower . works a weighted lover.
which is thrown over from ono side to the other by means of tappets l. 1. fixed
at the required distances ou a bar extending the whole length of the scrow i so
that an automatic feed backwards and forwards is obtained by the tappots l. 1.
throwing over the lever which throws the crescent shaped follower . alternately
into the right or left hand thread of the screw i. The follower kl. short spindle k
quadrant and weighted lever . are carried by an arm m². fitted by a hinge
joint m'. to a bracket m. fixed to the carringe b of the travelling table so that by
withdrawing a bolt n from a hole or socket in a lug on the back of the arm m³.
the follower may be caused to fall out of gear with the screw i. as shewn at
Figure 7 thereby setting the travelling bed free.
For regulating the extent of motion of the quadrant, adjustable set screws m³
are employed screwed into lugs on the arm m² as shown.
To prevent the screw sagging I employ a quadrant or other shaped lever u
mounted on a fixed axis o'. carried by a base plate to which lever o. a bearing o³,
is hinged at each end and between which bearings o'. the lever is so shaped as to
allow the aforesaid bracket m. to pass. Beneath the said bracket m. is a stud or
roller p. which when tho travelling table is about to pass the centre of its course
enters a groove o". formed in a projection of on the face of the quadrant or other
shaped screw supporting lever o. and gradually passes the said lever o, and its
screw bearings or supports o³. over from one side to the other so as to carry one
of such bearings o. out of position and the other into position for supporting
the screw after which the stud or roller p passes out of its groove o³. and
becomes free.
Having thus described the nature of my said Invention and the mode in which
I carry the same into effect I would have it understood that I do not claim
generally the application of automatic reversing feeding mechanism to glass
bevelling machinery or apparatus as in that class of bevelling machinery in which
the glass is held in a vertical plane and travols to and fro on a horizontal line self
neting reversing feeding mechanism has been applied But what I do claim is the
application to glass bevelling machinery or apparatus of the character herein
shown and described of self acting reversing feeding mechanism consisting of a
double cut screw and other parts combined therewith substantially as herein shewn
and described.
In witness whereof
hand and seal this
the said Thonins Parsonage have hereunto set my
eleventh day of October in the year of our Lord One
thousands Lund and sign the
TH PARSONAGE (L.S.)