From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Patent document detailing the claims and operation of a change speed transmission system.
| Identifier | ExFiles\Box 136\4\ scan0150 | |
| Date | 21th March 1931 guessed | |
| 1,897,851 5 the cam plate together. When the counter-sunk opening 325 and the hole 313 register with the plunger 343, the plunger is forced downwardly by its spring. The ball again is received into the hole 313 and the cylindrical part of the plunger engages the countersunk part of the fork whereby the fork is locked in position. Fig. 18 shows the parts in this locked position. Fig. 19 shows the beginning of the movement from neutral toward a position the opposite of that shown by Fig. 18. In this figure the cam plate has moved to the left prior to the movement of the fork, and the hole 313 has been moved into registration with the countersunk opening 325. From the position of the parts shown in Fig. 19 a continued movement of the lever will move the now registering openings 329 and 313 to a position where they may be engaged and the fork locked by the plunger as before. I claim: 1. In combination, a casing, a first member movable to do work, a second member, operating means having a snug fit with the second member and a lost motion connection with the first member, spring-actuated means locked to lock said first member to said casing, said second member having angularly formed walls to dislodge said locking means from engagement with both casing and first member during the movement of the second member relative to the first member by the operating means. 2. The invention defined by claim 1, said locking means between the first member and casing comprising a plunger in one of said members, said plunger having its external wall parallel with its longitudinal axis, and a notch in the other of said members, said notch shaped and dimensioned to fit said plunger. 3. In a change speed transmission including a casing, a first movable ratio changing member, a second member having a limited movement relative thereto, a spring-actuated plunger operable between a part rigid with said casing and said first member, said second member formed to move said plunger completely from its position in engagement with the casing part and the first member during its movement relative to said first part. 4. In a change speed transmission having a casing element, a reciprocable shift fork element, a spring-pressed plunger in one of said elements movable into positive locking engagement with said other element, said shift fork element having an elongated slot, a lock bar slidable in said slot, an operating member snugly engaging said lock bar and having a lost motion connection with said fork element, said lock bar having an angularly faced formation to push said plunger from engagement with both elements during the period of relative movement between the shift fork element and the lock bar. 5. In a change speed transmission having a casing element, a reciprocable shift fork element, a spring-pressed member in said casing element, said fork element having spaced notches shaped to admit said member into said fork and lock the fork element to said casing element in positions of the fork element corresponding to positions of the transmission members effecting predetermined driving ratios, a lock bar having notches with sloping walls, said notches being spaced further apart than the notches of the fork element, operating means to reciprocate the lock bar and having a snug fit therewith, there being a lost motion connection between the fork element and said operating means whereby the taking up of the lost motion effects registration between the notches of the fork and lock bar. 6. In a change speed transmission including a casing, a shift fork element, a lock bar arranged in parallelism therewith, said casing having a wall between said elements, said wall having an aperture therein and a movable member in said aperture, spaced spring-pressed plungers in said shift fork element, said lock bar having grooves spaced apart somewhat further than said plungers, operating means snugly engaging said lock bar, said operating means having a lost motion connection with said shift fork element whereby, upon taking up said lost motion, one of said grooves may register with one of said plungers to the end that when said registering parts also register with said movable member in the aperture of the wall, said movable member may enter the groove of the plunger and the plunger may lock the fork member to the casing wall. 7. In combination, actuating means, a shifting element having a lost motion relative thereto, a lock bar slidable relative to said shifting element and snugly engaging said actuating means, a relatively-fixed wall having a plurality of notches therein, said shifting element having a passage to register with any one of said notches, a locking element in said passage, said lock bar having a pair of adjacent notches with a peripheral surface therebetween, and yielding means between said operating means and said shifting element to normally hold said operating means in the mid position of the lost motion connection and said locking element in locking engagement with both the wall and the shifting element. In testimony whereof I affix my signature. ALBERT E.{Mr Elliott - Chief Engineer} LEACH. | ||