Improvements relating to Valves for Pneumatic Tyres and for like Purposes.
Year: 1899

page_text: Date of Application, 3rd Feb., 1899
Complete Specification Left, 23rd Oct., 1899-Accepted, 16th Dec., 1899
PROVISIONAL SPECIFICATION.
Improvements relating to Valves for Pneumatic Tyres and for like
Purposes.
I, HARRY LUCAS, Managing Director, of the Firm of Joseph Lucas, Limited,
of "Tom Bowling" Lamp Works, Little King Street, in the City of Birming-
ham, do hereby declare the nature of this invention to be as follows:-
-
This invention consists of improvements to be hereinafter set forth in valves
of the screw down type as described in the Specification No. 2839 of 1891 on
which Letters Patent have been granted, and as employed with the pneumatic
tyres of cycle and other vehicle wheels, and for other like purposes.
The object of my improvements is to render the valves more convenient and
effective for service.
In the construction of a valve in accordance with my invention for service
with a pneumatic tyre of a cycle wheel, I cut within the hollow body a left
hand screw thread corresponding with a similar thread which I cut upon the
exterior of the inner end of the valve stem. The outer end of the valve stem
has the ordinary right hand thread upon which is screwed the connecting tube
of the pump or inflator. By arranging a combination of right and left hand
screw threads on the one stem as described, the action of screwing the pump
connecting tube tightly on to such valve stem will withdraw the valve from its
seat and thus open the passage ready for the admission of the compressed air
from the pump to the tyre.
After the inflation of the tyre the valve, by means of the milled head on
its stem, can be screwed tightly home before the detachment of the pump
connecting tube.
The portion of the valve body projecting through the rim beyond the ordinary
clamping nut I turn down to such a diameter that the check cap screwed on
the same may be made less than the diameter of the valve aperture in the
wheel rim, and as I also make the head on the valve stem slightly smaller than
such aperture, the complete valve, after the release of the clamping nut herein-
before referred to, can be readily fixed, without dismantling, in position on a
wheel rim or withdrawn therefrom when necessary.
I preferably make a left hand screw thread connection between the check_cap
hereinbefore referred to and the reduced end of the valve body. I cover or enclose
the check cap and also the projecting end of the valve stem with a dust cap con-
sisting of a metallic case, suitably split or so formed as to cause it to grip
sufficiently upon the valve to prevent accidental detachment.
The joint between the valve and its seat I form by pressing a small plug
or disc of leather or other suitable material into an aperture formed in the
face of the valve itself.
בד
B
1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, and 25, Cross Street, Manchester,
Agents for the Applicant,

page_text: Improvements relating to Valves for Pneumatic Tyres and for like
Purposes.
:
I, HARRY LUCAS, Manager Director of the Firm of Joseph Lucas, Limited,
of "Tom Bowling" Lamp Works, Little King Street, in the City of Birming-
ham, 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 consists of improvements to be hereinafter set forth in valves
of the screw down type as described in the Specification No. 2839 of 1891 on
which Letters Patent have been granted, and as employed with the pneumatic
tyres of cycle and other vehicle wheels and for other like purposes.
The object of my improvements is to render the valves more convenient and
effective for service.
The figures on the accompanying sheet of explanatory drawings to be herein-
after referred to represent (to an enlarged scale) a pneumatic tyre valve
constructed in accordance with my invention.
Figure 1 is an elevation showing the complete valve but without dust cap.
Figure 2 is an elevation of the valve body alone.
Figure 3 is an elevation of the complete valve with the dust cap in position
thereon.
Figure 4 is an elevation of the valve stem.
The same reference letters in the different views indicate the same parts.
In the construction of a valve in accordance with my invention for service
with a pneumatic tyre of a cycle wheel, I cut within the hollow body A a left
hand screw thread corresponding with a similar thread which I cut upon the
exterior of the inner end 6 of the valve stem. The outer end of the valve
stem has the ordinary right hand thread upon which is screwed the connecting
tube of the pump or inflator. By arranging a combination of right and left
hand screw threads on the one stem as described, the action of screwing the
pump connecting tube tightly on to such valve stem will withdraw the valve
from its seat and thus open the passage ready for the admission of the compressed
air from the pump to the tyre.
After the inflation of the tyre, the valve, by means of the milled head 62 on
its stem, can be screwed tightly home before the detachment of the pump
connecting tube.
The outer portion a of the valve body A projecting through the rim and
beyond the ordinary clamping nut C I turn down to such a diameter that the
check cap D screwed on the same may be made less than the diameter of the
valve aperture in the wheel rim, and as I also make the head 2 on the valve
stem slightly smaller than such aperture, the complete valve, after the with-
drawal of the clamping nut C, can be readily placed, without dismantling, in
position on a wheel rim or withdrawn therefrom when necessary.
I make a left hand screw thread connection between the check cap D and
the reduced end a of the valve body, and I cover or enclose the check cap and
also the projecting end of the valve stem with a dust cap E consisting of a
metallic case, suitably split or so formed as to cause it to grip sufficiently upon
the valve to prevent accidental detachment.
The joint between the valve comprised by the inner extremity of the valve
stem, and its seat in the valve body A, I form by pressing a small plug or disc

page_text: of leather or other suitable material into an aperture made in the face of the
valve itself.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:―
1. In valves for pneumatic tyres and for like purposes of the type herein-
before described, the combination of right and left hand screw threads on both
the valve body and the valve stem, and the construction of the said parts in
such a manner as to permit of the placing of the valve in its service position
and of its withdrawal therefrom, without dismantling, substantially as described.
2. An improved pneumatic tyre valve comprised by the combination of parts
constructed and arranged substantially as and for the purposes described and
as illustrated.
D
01
1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, Agents.