Patent GB-190125428-A (GB)
Title: Improvements in or relating to Combined Speed Indicating and Distance Measuring Mechanism.
Inventor: DARLEY JOHN WESLEY
Filed: 1901-12-12
Granted: 1902-06-05
Abstract: 25,428. Darley, J. W. Dec. 12. Speed indicators.-A speed indicator is combined with a cyclometer upon an arm I which is clamped to the fixed axle of a travelling-wheel by the terminal nut. The mechanism is carried by a pair of plates C, a<5>, one laid against the back of the casing a and the other fixed at the front by a pair of pins a<6> that can be easily knocked out after exposure by removing the cover-plate a<4>. A pallet clamped on the hub of the travelling wheel hits an eight-rayed star-wheel E, Fig. 4, on one end of an arbor D, and, when it is acting on a special ray, a pallet D' at the other end of the arbor transmits the impulse to a balance-wheel, which rests against a padded bracket and is attached to a spring B<9> coiled from the bracket to the hub. The balance-wheel swings accordingly, and is prevented from returning till five more rays of the star-wheel have been hit, because a ratchet-toothed arc B<15> upon it is lightly engaged by a pawl G, shown separately in Fig. 19<a> ; thus, during five-eighths of the revolution of the starwheel, the graduated broad rim B<4> of the balancewheel shows the speed against an index point a<8> on the casing, and, when the fifth ray is bit, a cam D<4> preceding the impulse pallet D' disengages the pawl, so that the balance swings back and comes to rest again in time for the impulse pallet to act again. The blow is given either on a pin B<16> near the centre of the balance or on a pallet B<12> at the periphery, according to the direction of travel. A spring H, having two branches, corrects the action of the star-wheel by engaging radial V- grooves in the hub of the impulse pallet D', and presses against a bolt J for suspending the speed indication. A ton-toothed wheel S on one of the ring of pins is driven by an eccentric pin I on the cam D<4>, upon the arbor D of the star-wheel E, and, when the pin is out of engagement, the arbor locks the wheel. A finger S<7> on the hub of the wheel drives the counting-wheel, and its hub S' locks the same when the finger is out of action. Odometers.-Counting-wheels K, L, M, N, O, occupying a smaller casing a' integral iwith the speed-indicator casing, turn upon a ring of pins T, G<3>, S<2> connecting the frame plate C and the back a<3> of the casing. Each wheel, except the first wheel K, has ten short pins (not shown) on the side towards the first wheel, and all have one pin on the opposite side, which is set just under an aperture in the rim, while between each pair of wheels is mounted on the shaft S' a compound triangular notched pinion R, R', Fig. 34. When 10 has to be carried, the single pin of a wheel turns the pinion R, R', and the latter drives the adjacent wheel by acting on one of the ten pins. The first wheel K, which counts tenths of miles, is driven as follows :-A ten-toothed wheel S on one of the pins T is driven by an eccentric pin on the cam D<4>, upon the arbor D of the starwheel E, and, when the pin is out of engagement, the arbor locks the wheel. The finger S<7> on the hub of thewheel drives the counting-wheel.