Improvements in Pedals for Velocipedes.
Year: 1892

page_text: Date of Application, 19th Oct., 1892
Complete Specification Left, 11th July, 1893-Accepted, 19th Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements in Pedals for Velocipedes.
AUGUSTINE CAMPBELL DAVISON 531 Holloway Road in the County of
Middlesex Civil Engineer do hereby declare the nature of this invention to be as
follows:-
The object of this invention is to construct a "rat-trap" pedal for velocipedes in
such a way that the rat-trap bars are made stronger both vertically and laterally
with the same amount of material as usual, and so they and consequently the pedal
can be made lighter than usual with the same strength, also that the rat-trap bars
are not liable to be bent by the foot being accidently placed upon the flat side in
starting the machine, and the bearings consequently thrown out of parallel as
commonly happens with pedals constructed in the usual way.
To attain this end I construct the pedal of the usual number of parts but place
the end plates containing the ball races closer together than the usual width of a
shoe sole. These end plates are of the same pattern as usual except that the part
projecting at the top & bottom to prevent the foot slipping sideways is done away
with. The ends of these two plates pass through slots in the rat trap bars & are
connected to them by the ends being rivetted over.
The rat-trap bars are made slightly deeper than usual to allow the shoe sole to
clear the ball cases, and the ends of the bars are slightly turned up to prevent the
foot slipping sideways.
The action of this arrangement in preventing bending of the bars is as follows-
Should the foot be accidently placed upon the flat side of the rat-trap bar, the
pressure falls direct upon the ends of the end plates which are closer together than
the width of the shoe sole and the bar consequently has no tendency to bend. Also
the length of the rat trap bar unsupported between the end plates being less than
usual the bar is stronger vertically considered as a girder and need not contain so
much metal to be of equal strength with the usual arrangement.
Dated this the 17th day of October 1892.
AUGUSTINE CAMPBELL DAVISON.
COMPLETE SPECIFICATION.
Improvements in Pedals 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:-
The object of this invention is to construct a rat-trap pedal for velocipedes in
such a way that the rat-trap bars are made stronger both vertically & laterally
with the same amount of material as usual, and so they and consequently the
pedal can be made lighter than usual with the same strength; also that the
rat-trap bars are not liable to be bent by the foot being accidently placed upon
their flat side in starting the machine, and the bearings consequently thrown out of
parallel as commonly happens with pedals constructed in the usual way.
To attain this end I construct the pedal of the usual number of parts but
place the end plates containing the ball-races closer together than the usual
width of a shoe sole. These end plates are of the same pattern as usual except
that the part usually projecting at the top and bottom to prevent the foot slipping
D

page_text: sideways is done away with. The ends of these two plates pass through slots in
the rat trap bars and are connected to them by the ends being rivetted over.
The rat-trap bars are made slightly deeper than usual to allow the shoe sole to
clear the ball cases, and the ends of the bars are slightly turned up to prevent the
foot slipping sideways.
The action of this arrangement in preventing bending of the bars is as follows.
Should the foot be accidently placed upon the flat side of the rat-trap_bar_the
pressure falls direct upon the ends of the end plates, which are closer together than
the width of the shoe sole and the bar consequently has no tendency to bend. Also
the length of the rat-trap bar unsupported between the end plates being less than
usual the bar is stronger vertically considered as a girder and need not contain so
much metal to be of equal strength with the usual arrangement.
In order that my invention may be fully understood I will more particularly
describe it with the aid of the accompanying drawings in which similar parts are
marked with like letters of reference.
In the accompanying drawings
Figure 1 is a view in side elevation, Fig. 2 is a view in plan and Fig. 3 is a view
in end elevation of a pedal constructed according to my invention.
Referring to these figures-A. A are the rat-trap bars with the ends turned up
to prevent the foot slipping sideways. B. B are the end plates which are placed
some distance in from the ends of the rat-trap bars, & have their ends passed
through slots in the said rat-trap bars & rivetted over. C. C are the ball cases
made in one with the end plates B B as usual but without the ordinary pieces for
preventing the foot moving sideways D is the pedal pin which is constructed as
usual except that it has the cone for the balls to run on, formed on it at a distance
from the end suited to the ball case C.
Having now particularly described the nature of my said invention & in what
manner the same is to be performed, I declare that what I claim is―
1. A rat trap pedal constructed & operating as & for the purpose hereinbefore
specifically described and set forth.
2. In a rat trap pedal, the combination of end plates & rat trap bars arranged &
operating as & for the purpose hereinbefore described & set forth.
3. In a rat trap pedal placing the end plates closer together than the width of a
shoe sole for the purpose herein before described & set forth.
Dated this the 10th day of July 1893.
AUGUSTINE CAMPBELL DAVISON.