Improvements in Lamps for Velocipedes.
Year: 1889

page_text: Date of Application, 30th Mar., 1889
Complete Specification Left, 4th June, 1889-Accepted, 6th July, 1889
PROVISIONAL SPECIFICATION.
Improvements in Lamps for Velocipedes.
I AUGUSTINE CAMPBELL DAVISON of 531 Holloway Road in the County of Middlesex,
Civil Engineer do hereby declare the nature of this invention to be as follows:-
This invention relates to lamps for bicycles tricycles & other velocipedes, &
consists
Firstly. In means for improving the light given by a lamp by collecting and
uniformly distributing more of the rays of light than usual.
Secondly. A method of constructing the body of a lamp so as to simplify it and to
allow of a larger oil reservoir being used without increasing the size of the lamp.
Thirdly. An adjustable india-rubber lined joint or hinge for the carrying arm or
arms of an antivibrating spring back, to secure adjustment for wear.
Fourthly. An india-rubber lined joint or hinge for the carrying arm or arms of an
anti vibrating spring back combining or containing in itself the spring necessary to
control the motion of the said arm or arms and to suspend the lamp.
Fifthly. A means of setting the lamp at any vertical angle with respect to the
carrying socket.
To secure the first essential I proceed as follows. In place of the usual glass I use
a lens. I prefer to make the said lens of the ordinary double convex form but an
ordinary plano-convex lens may be used. I place the aforesaid lens at a suitable
distance from the flaine, so as to refract the divergent rays of light proceeding from
the flame into a beam of light of a conical form and uniform distribution gradually
widening from the lamp. I fix the aforesaid lens in the wider end of a truncated conical
or nearly conical mount which forms a reflector, the truncated end of the said mount
being close to the flame. At the back of the flame is a concave reflector, the curvature
of the said reflector and the inclination of the aforesaid conical mount, or the
curvature of the aforesaid nearly conical mount being such that the light incident
upon them and reflected by them conspires with the light refracted by the lens to
produce the conical beam of light herein before referred to.
To secure the second essential I proceed as follows. I divide the lamp into two parts
in a horizontal plane. The upper part consists of the lens or glass with its mount and
reflector with a casing forming the body of the lamp and holding the said parts in
proper position. The lower part is formed by the oil reservoir with its burner wick
winder and fittings. The said upper and lower parts are jointed together by a hinge
placed horizontally at one side of the lamp and connecting the lower
upper edges of
the upper and lower parts respectively, and are kept in juxta position by a spring
catch.
To secure the third essential I proceed as follows. The carrying arm or arms of an
antivibrating spring back terminate at each end in a transverse pivotal pin working
through an india-rubber lined sleeve bearing as is usual in antivibrating arrangements.
I divide this sleeve or cylinder which is attached to the back of the lamp or to the
near side of the socket, and also its india-rubber lining longitudinally & draw the split
together by a screw or screws so that by turning the said screw. or screws, the split
sleeve or cylinder together with its india-rubber lining is drawn closer round the
pivotal pin and adjustment for wear secured.
To secure the Fourth essential I proceed as follows. I prefer to joint or hinge the
carrying arm or arms of an antivibrating spring back at one end to the socket plate
or to the lamp by an india-rubber lined joint or hinge combining or containing the
spring necessary to control the motion of the arm or arms and to suspend the lamp.
or the arm or arms may be hinged at each end with the aforesaid joint or hinge; the
construction of which I will now describe. A plate attached to the socket plate or to

page_text: the back of the lamp according to its position at one or the other end of the arm is
formed into a square or rectangular tube or box with its axis horizontal and parallel
to the back of the lamp. The said tube or box is filled with a square or rectangular
bar of india-rubber having two small holes through it from end to end parallel with
its axis. Through each of these said holes passes a pin which is attached to or forms
part of the arm. The action of this is as follows. When the lamp is suspended from
the arm or arms its weight causes the india.rubber under one and above the other of
the pins to be compressed until equilibrium ensues, thus forming a spring to control
the movement of the arm or arms and to suspend the lamp.
To secure the Fifth essential I proceed as follows. The socket plate on the side remote
from the lamp is made to form or has attached to it two lugs projecting backwards in
the same horizontal plane, each lug being pierced horizontally and parallel to the
back of the lamp with a hole. The hollow socket piece is of such size as to just fit
between the aforesaid lugs and has formed on it on each side a short screwed pin
which passes through one of the holes in the lugs aforesaid, so that the socket piece
oscillates in a vertical plane on the pins as trunnions. A nut is screwed on each of the
aforesaid pins having the lug between it and the socket piece. The action is as follows.
The nuts being slackened the socket piece is turned on the pins or trunnions until the
lamp makes the required angle with the said socket piece and the nuts are then
tightened holding the whole firm in that position by friction.
Dated this 29th day of March 1889.
AUGUSTINE CAMPBELL DAVISON.
COMPLETE SPECIFICATION.
Improvements in Lamps for Velocipedes.
AUGUSTINE CAMPBELL DAVISON 531 Holloway Road in the County of Middlesex
Civil Engineer 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 lamps for bicycles, tricycles, and other velocipedes and
consists Firstly in means for improving the light given by a lamp by collecting and
uniformly distributing more of the rays of light than usual. Secondly. A method of
constructing the body of a lamp so as to simplify it and to allow of a larger oil
reservoir being used without increasing the size of the lamp. Thirdly. An adjustable
india-rubber lined joint or hinge for the carrying arm or arms of an antivibrating
spring-back, to secure adjustment for wear. Fourthly. An india rubber lined joint or
hinge for the carrying arm or arms of an antivibrating spring back combining or con-
taining in itself the spring necessary to control the motion of the said arm or arms
and to suspend the lamp. Fifthly. A means of setting the lamp at any vertical angle
with respect to the carrying socket.
To secure the first essential I proceed as follows. In place of the usual glass I use
a lens. I prefer to make the said lens of the ordinary double-convex form but an
ordinary plano-convex lens may be used. I place the aforesaid lens at a suitable
distance from the flame so as to refract the divergent rays of light proceeding from
the flame into a beam of light of a conical form and uniform distribution gradually
widening from the lamp. I fix the aforesaid lens in the wider end of a truncated
conical or nearly conical mount which forms a reflector, the truncated end of the said
mount being close to the flame. At the back of the flame is a concave reflector, the
curvatures of the said reflector and the inclination of the aforesaid conical mount, or
the curvature of the aforesaid nearly conical mount being such that the light incident
upon them and reflected by them conspires with the light refracted by the lens to
produce the conical beam of light herein before referred to.
To secure the second essential. I proceed as follows. I divide the lamp into two
parts in a horizontal plane. The upper part consists of the lens or glass with its mount
and reflector, with a casing forming the body of the lamp and holding the said parts in

page_text: proper position. The lower part is formed by the oil reservoir with its burner, wick
winder & fittings. The said upper and lower parts are jointed together by a hinge
placed horizontally at one side of the lamp and connecting the lower and upper edges
of the upper and lower parts respectively, and are kept in juxta-position by a spring
catcli.
To secure the third essential I proceed as follows. The carrying arm or arms of an
antivibrating spring back terminate at each end in a transverse pivotal pin working
thro an india-rubber lined sleeve bearing as is usual in antivibrating arrangements.
I divide this sleeve or cylinder which is attached to the back of the lamp or to the
near side of the socket, and also its india rubber lining longitudinally and draw the
split together by a screw or screws. So that by turning the said screw or screws
the split sleeve or cylinder together with its india rubber lining is drawn closer round
the pivotal pin and adjustment for wear secured.
To secure the fourth essential I proceed as follows. I prefer to joint or hinge the
carrying arm or arms of an antivibrating spring back at one end to the socket plate or
to the lamp by an india rubber lined joint or hinge combining or containing the spring
necessary to control the motion of the arm or arms and to suspend the lamp, or
the arm or arms may be hinged at each end with the aforesaid joint or hinge, the
construction of which I will now describe. A plate attached to the socket plate or to
the back of the lamp, according to its position at one or the other end of the arm is
formed into a square or rectangular tube or box with its axis horizontal and parallel
to the back of the lamp. The said tube or box is filled with a square or rectangular
bar of india-rubber having two small holes through it from end to end parallel to its
axis. Through each of these said holes passes a pin which is attached to or forms part
of the arm. The action of this is as follows. When the lamp is suspended from the
arm or arms its weight causes the india-rubber under one and above the other of the
pins to be compressed until equilibrium ensues, thus forming a spring to control the
movement of the arm or arms and to suspend the lamp.
To secure the fifth essential I proceed as follows. Tho socket plate on the side
remote from the lamp is made to form or has attached to it, two lugs projecting back-
wards in the same horizontal plane, each lug being pierced horizontally and parallel to
the back of the lamp with a hole. The hollow socket piece is of such size as to just fit
between the aforesaid lugs and has formed on it on each side a short screwed pin
which passes through one of the holes in the lugs aforesaid, so that the socket piece
oscillates in a vertical plane on the pins as trunnions. A nut is screwed on each of
the aforesaid pins having the lug between it and the socket piece. The action is as
follows. The nuts being slackened the socket piece is turned on the pins or trunnions
until the lamp makes the required angle with the said socket piece and the nuts are
then tightened holding the whole firm in that position by friction.
I will now proceed to describe with reference to the accompanying Drawing the
manner in which my invention is to be performed.
Figure 1 represents in vertical section a lamp constructed according to my inven-
tion. Figure 2 is a view in vertical section of a lamp constructed according to my
invention. Figure 3 is a view in plan of the lamp. Figures 4 and 5 are vertical
sections of modifications of the cone and lens. Figures 6 and 7 are views in elevation
and plan respectively of a modification of that part of my invention appertaining to
the socket and attachment.
The same letters of reference indicate the same parts in the several Figures of the
Drawing.
:
Referring to the first part of my invention which is illustrated by Figures 1, 2, 3,
and 5.
A is the lens refracting the divergent rays of light proceeding from the flame into a
conical beam of light, the course of the rays being shown approximately in Figure 1.
B is the cone containing the lens and reflecting other of the rays of light onto the
lens. C is the concave reflector of such a shape that the rays incident on and reflected
by it are brought to a focus at the position of the flame, the said rays then crossing
and conspiring with the direct rays, or with the rays reflected by the cone B to form the

page_text: ↓
.
aforesaid cone of light. The lens A and the cone B may be modified in form or outline
as shown in Figures 4 and 5 and suited to the position of the light and reflector and
extent of radiation of light required.
Referring to the second part of my invention which is illustrated by Figures 1, 2
and 3.
D is the upper part of body of lamp to which are attached the cone B, containing the
lens A and the reflector C. E is the lower part of body of lamp consisting of the oil-
tank with its burner and fittings. e is a hinge or half-hinge connecting the parts D
and E and e¹ is a spring catch keeping them in proper juxta-position. It is obvious
that the connecting parts e and e¹ may be modified.
Referring to the third part of my invention which is illustrated by Figures 1, 2
and 3.
5
1
I make an antivibrating attachment in the manner already known and illustrated by
Figures 1 and 3. The carrying arms F, F terminate as usual at one or each end in a
pivotal pin working through an india-rubber bush or sleeve bearing. These india 1
rubber bushes f. f. f however divide longitudinally and surround them by the split
sleeves or cylinders ff. These sleeves or cylinders are drawn together
or tightened round the pivotal pins by screws or bolts f2f2f so securing adjustment
for wear and preventing noise.
+2
Referring to the fourth part of my invention which is illustrated by Figures 12
and 3.
I make an antivibrating attachment in the manner already known or in the manner
herein before described, and shown in Figures 1 and 3 but instead of controlling the
motion of the lamp by a vertical coiled spring I use a transverse joint containing in
itself the necessary spring and shown in Figures 1.and 3. 1 connect the socket plate 2
with the body of the lamp by a pair of arms F, F working thro' rubber bushes f. ff
at three of the joints as hereinbefore described but the fourth joint is formed by the
socket plate H or a plate attached to the socket plate being formed into a square or
rectangular tube . This tube is filled with a bar of flexible india-rubber /³, in which
are two small holes from end to end, through which pass pins ³ ³ connecting the 3
bars F, F. It will be obvious that a spring may be placed at each end of the arms or
that instead of using two arms or pairs of arms, a single pair may be used containing
a spring at each end.
It is also obvious that a small flat plate of the same width as
the distance between the pins ³ ³ may be substituted for them if desired.
When the lamp is suspended by the socket, the india-rubber bar h² is compressed 3
by its weight acting through the pins h³ ³ to an extent varying with the jolts the lamp
receives; thus forming a spring.
Referring to the 5th part of my invention which is illustrated by Figures 1, 3, 6
and 7.
The socket plate H has attached to it or formed on it two lugs K, K projecting 4
backwards and containing between them the socket piece L. On each side of the
socket piece a short screwed pink is formed and projects through a hole in the
lugs K, K. Upon the pins k, k, nuts k¹, k¹ are screwed, gripping when tightened
the lugs K, K between themselves and the socket piece L, so that by tightening
the nuts k. the socket piece L is fixed at any required vertical angle, within
limits, with regard to H. Figures 6 and 7 show a modification of the arrange-
ment in which one bolt is substituted for the two short screwed pins before
referred to.
It will be obvious in the 1st part of my invention, that a plain glass may be
substituted for the lens at a cost of some efficiency.
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. In a velocipede lamp the combination of the conical or nearly conical mount B,
with the double convex lens A arranged and operating as and for the purpose set

page_text: 2nd. In a velocipede lamp.the combination of the conical or nearly conical mount B
with the single convex lens A, arranged and operating as and for the purpose set
forth.
3rd. In a velocipede lamp the combination of the conical or nearly conical mount B,
single or double-convex lens A and concave reflector C arranged and operating as and
for the purpose set forth.
4th. In a velocipede lamp the combination of the conical or nearly conical mount B
and concavo reflector Carranged & operating as set forth.
5th. In a velocipede lamp constructing the body in two paris D & E constructed
arranged and operating as and for the purpose set forth.
6th. In a velocipede lamp having an antivibrating arrangement of the type herein-
before described and illustrated by the accompanying Drawing, the adjustable india-
rubber lined joints, acting as and for the purpose set forth.
7th. In a velocipede lamp the body of which is hinged or suspended from the sup-
porting socket by one, two, or more arms, controlling the movement of the body of
the lamp with respect to its support by means of one or more india-rubber spring
joints forming part of the said body or support constructed and operating as set
forth.
8th. In a velocipede lamp the socket L, adjustable to an angle in a vertical plane,
arranged and operating as and for the purpose set forth.
9th. In a velocipede lamp the combination of socket L, lugs K, screwed pins k, k,
and socket plate H constructed arranged and operating as & for the purpose herein-
before set forth.
Lastly. The improvements in the construction and arrangement of the parts of
velocipede lamps substantially as hereinbefore set forth.
Dated this 3rd day of June 1889
AUGUSTINE CAMPBELL DAVISON.