Improvements in and connected with Pneumatic Tyres.
Year: 1892

page_text: Date of Application, 10th Oct., 1892-Accepted, 12th Nov., 1892
COMPLETE SPECIFICATION.
Improvements in and connected with Pneumatic Tyres.
I, FRIEDRICH VEITH of Kreuznach in the Kingdom of Prussia, German
Empire, 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 improvements in pneumatic tyres, and it has more
particularly for its object an improvement in the construction of the pneumatic
tyre for which I have obtained Letters Patent in Great Britain No. 15620, dated
September 15, 1891.
The particular feature of the pneumatic tyre described and claimed in the
aforesaid Patent consists in the mode of fastening the pneumatic tyre upon the
wheel rim by means of an open hoop passed through the hollow tyre and tightened
so as to press the edges of the slotted rubber tube firmly against the wheel rim,
thereby establishing an hermetic joint.
My invention will be best understood by reference to the accompanying sheet of
illustrative drawings, on which,
Figures 1, 2 and 3 are a sectional elevation, a front view and a rear view
respectively of a portion of a tyre with my improvements applied.
Figures 4 and 5 are a front and side view respectively of the eccentric herein-
after described.
Figure 6 is a cross section of my improved tyre.
In my present invention the improvements consist, first, in not arranging the
before mentioned hoop inside of the hollow rubber tube, but within a suitable
seat formed below the tube; I thereby obtain the great advantage that the rubber
tube need not be slotted, but forms a closed circular tube, only provided with a
suitable valve for forcing air into the hollow space of the tube.
This part of my invention is illustrated by Figure 6 of the accompanying
drawings, representing a cross section of the pneumatic tyre mounted on the
wheel-rim.
C is the hollow rubber tube forming an hermetically closed internal hollow space
capable of being filled with compressed air through a suitable valve communicating
with the said space as is usual with tyres of this kind.
In the lower side of the before mentioned rubber tube C, a seat is formed to
receive the open hoop B, the ends of which are forced towards and over each other,
thereby pressing the ends or heels C¹ C' of the tube C firmly against the wheel-
rim A and holding the tyre secured upon the said rim. I prefer to form the wheel-
rim A with a slight bend, as shown in Figure 6, whereby the heels C¹ of the rubber
tube are prevented from slipping.
The two ends of the hoop B, being forced against and over each other, with a
suitable packing between them as shown in Figure 1, which represents a
longitudinal section of the wheel-rim A and hoop B, must be locked in position,
when the desired degree of tightness of the before-mentioned hoop B has been
obtained.
In my former Patent No. 15620 of 1891, the ends of the said hoop B were
locked by screws entering into screw sockets. According to the present improve-
ments, the lug b which is secured to one end of the open hoop B and has sufficient
play to slide in a slot y of the wheel rim A, the corresponding lug a having no play,
is locked in its final position by means of an eccentric n, of which Figure 4 is a top
view and Figure 5 a side view. This eccentric n has a suitable number of notches
or rests, formed in one of its sides and is secured by means of a projecting stud n¹
in the wheel-rim A and is capable of being revolved on this stud n'.

page_text: Figure 2 represents a view from below of the two ends of the hoop B with the
lngs ab secured thereto.
Figure 3 is a view from beneath of the wheel-rim and projecting lugs in their
locked position.
When the lug b, sliding in the slot y of the wheel-rim, has been sufficiently
tightened up towards lug a, (such tightening being performed by means of a screw,
as described in my former Patent, or by any other suitable means, such as a lever,
or the like) the beforementioned eccentric n is turned on its stud n' in such a way
as to engage with one of its notches or rests with the rear edge of lug whereby
the said lug and the corresponding end of the open hoop B are prevented from
sliding back. The several notches, or rests, of the eccentric n serve to adjust lug b
according to the degree of tightness required for the hoop B. By this means,
the degree of tension of hoop B may easily be diminished or increased by
causing lug b to engage with one of the rests of the eccentric n more or less adjacent
to the pivot n'..
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-
1. An improved pneumatic tyre, consisting of an elastic hollow tyre forming a
closed tube C and having on its lower or wheel rim side heels C¹ C¹ and a seat for
receiving an open hoop B serving to secure and tighten the tyre upon the wheel
rim, substantially as described.
2. A pneumatic tyre consisting of an elastic hollow tyre forming a closed tube C,
and having on its lower, or wheel, rim side heels C₁ C and a seat for receiving an
open hoop B, the ends of said hoop being provided with lugs a b, projecting
through the wheel rim A in combination with an eccentric n pivoted within the
wheel rim and having notches or rests to lock the sliding lug of one of the hoop
ends, substantially as described.
Dated this 8th day of October 1892.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.