Year: 1888

page_text: Date of Application, 3rd Mar., 1888
Specification Accepted, 6th Apr., 1888
JOHN MAXFIELD 326 Liverpool Road London Mechanical 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
My invention relates to an automatic bolt stop-brake, which is adapted so that it
can be readily fixed to any perambulator, or other similar carriage, by an unskilled
person.
In the accompanying drawing Figure 1. is a side view of my invention, with
section of a perambulator wheel and portion of spokes, showing the same clamped to
the spring or ironwork of perambulator, and the manner in which the bolt engages
with the spokes. Figure 2. is an end view of same and Figure 3. is an end view
showing the position of weight.
A. represents a piece of tube of a convenient size and length, a winding slot B. is
cut in the tube A. and runs about half way round. In the tube A a bolt C. is fitted,
a peg D. provided with an eyelet-hole at the end, passes through the slot B. and is
secured into the bolt C. In the eyelet-hole D. a cord E. is secured, so that when the
cord E. is pulled forward the peg D. slides in the slot B. and withdraws the bolt C.
into the tube A. A spiral spring is placed in the tube A. at the back of the bolt C to
force it back to its normal position when there is no pressure applied to the cord E.
When the bolt is in this position it comes in contact with one of the spokes K. in the
wheel fig. 1. and effectually scotches it.
Instead of the spiral spring for forcing the bolt back, I may use a weight I. fig. 3
in this case the position of the slot B. would be on the side of the tube A. instead of
on the underside as in fig. 1.
To secure the tube A. to the perambulator, I provide a double sided clamp F. which
is provided with a winged screw H. the sides of this clamp are bored for the reception
of the tube A. with this clamp the said tube A. can be clamped in any convenient
position on the spring or ironwork G. of the perambulator, as shown in fig. 1. and 2.
The cord E. is carried forward to the handle and passes through an eyelet-hole,
a knot is tied on the cord to prevent it falling out of the eyelet-hole. When it is

page_text: required to free the wheel the cord is drawn forward, which withdraws the bolt in the
mnner described, and is held by the hand on the handle. To avoid the necessity of
hoding the cord with the hand, the handle is made to turn round and a peg projects
from the handle to which is attached the cord E, so that if the handle is partially
tuned it draws the cord forward as before.
i may withdraw the bolt by other means than by the winding slot as described,
such as a straight slot running parallel in the tube A. the eyelet D. to which the cord
isattached would be inserted as before, and the cord would pass round a small pulley,
or through an eyelet, provided for the purpose, so as to obtain a direct pull on
the bolt.
Having described the nature of my invention and shown how the same may be
carried into practice, I claim
1. In an automatic stop-brake for perambulators or similar carriages, the tube A,
provided with slot B, bolt C, peg D, spring or weight I, and cord E, actuated in the
inainer described and for the purpose specified.
2. For an automatic bolt stop-brake for perambulators or similar carriages, the
clamp F, provided with winged screw H, for clamping the stop-brake to the spring or
iranwork as described.
3. In an automatic stop-brake for perambulators or similar carriages the bolt C.
provided with suitable mechanism for withdrawing and adapted to come in contact
with the spokes of the wheel.