The Turquand Detachable Rim.

Progress, Volume II, Issue 7, 1 May 1907, Page 252

The Turquand Detachable Rim.

A simple and ingenious detachable rim has been invented by Mr. Turquand, Broad Street buildings, E.C. By its use a tyre may be removed in an incredibly short space of time, and, moreover, it can easily be adapted to any set of wheels, since all that is necessary is to saw off the outer edge of the rim and a small

portion of the felloe. Referring to the illustration, it will be seen that the wheel has the outer edge of the rim A removed, while at intervals round the felloe hooks D are situated. In these hooks steps are cut, there being a short step on one side and a long step on the other. The tyre to be fitted has the partly inflated tube placed inside it, and the valve is inserted in the hole in the rim meant for that purpose. The tyre can then be slipped over the outside edge of the wheel. The circular plate B is then placed near the felloe so that the slot I is opposite the square hole in the wheel F. It will then be found that the other slots I, correspond with the hooks D. The plate is now placed with its edge against the beading of the tyre, and a piece of iron to act as a lever (anything will do provided it is not too large) is inserted through the slot I, and moved towards the left. The effect of this is to force round the plate for a short distance so that the slots L are forced underneath the short steps on the hooks D. The tyre is now fixed in position to take some of the strain off the plate D ; a circular D -section tube C is provided in which slots J similiar to L are cut. This is placed in the same manner against the plate B. But the lever is moved in the reverse direction, thus

moving the outer plate against the long steps of the hooks in the felloe. As the slots are cut only on the inner surface of the top plate C all the hooks are covered, and there is no chance of wet reaching the inner portion of the rim. Also, since there are no outer projections, the wheel may be scraped against the kerb without fear ,of damage. The tyre is now as rigidly fixed as if it were on a solid rim, and it only remains to insert the square bolt H in the slot I, and the bolt G through the hole X, and to complete the inflation. Since the two plates move in different directions against the hooks, the locking action is perfect, while the two bolts referred to are more as a precaution than as a necessity. Mr. Turquand has thoroughly tested his rims on his own car, and declares they have given him absolute satisfaction. There is no doubt that the device is delightfully simple. All that is required to unship the tyre is the removal of two bolts and two short movements of the lever. Mr. Turquand's theory is that security bolts are most wanted in close proximity to the tyre valve, and in wheels of his design one is placed on each side of the valve as shown. O represents a novel iorm ot security bolt made by the inventor of the rim. It will b? seen that the stem is hinged close to the valve head, which results in the device being more readily placed in position than the old type, with less fear of nipping the tube.