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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).
United States Patent for a gear shift lock mechanism, assigned to General Motors.

Identifier  ExFiles\Box 136\4\  scan0146
Date  14th February 1933
  
Patented Feb. 14, 1933
1,897,851
UNITED STATES PATENT OFFICE
ALBERT E.{Mr Elliott - Chief Engineer} LEACH, OF ROYAL OAK, MICHIGAN, ASSIGNOR TO GENERAL MOTORS CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION OF DELAWARE
GEAR SHIFT LOCK
Application filed May 12, 1932. Serial No. 610,797.
This invention relates to change speed transmission and is especially intended for use with motor vehicles.
5 An object of the invention is to provide means to lock the parts when shifted to driving positions to the end that the elements effecting selected driving ratios may not become disconnected except when ex-
10 ternal shifting means is actuated.
The provision of a simple and inexpensive structure to accomplish the above object constitutes a secondary object of the invention.
Other objects and advantages will appear
15 from the following description.
Fig. 1 is a transverse section through a change speed mechanism having my invention embodied therein.
Fig. 2 is a longitudinal section on line
20 2—2 of Fig. 1.
Fig. 3 is a perspective of a detail.
Fig. 4 shows a portion of the mechanism in longitudinal section, the section corresponding to that of Fig. 2 but having the
25 parts in changed relation.
Fig. 5 is a similar view in section of the same parts in still another position of adjustment.
Fig. 5a is a detail view of the fork in
30 section.
Fig. 6 is a transverse section showing a modified form of the invention.
Fig. 7 is a section on line 7—7 of Fig. 6.
Fig. 8 is a top plan view of the shifting
35 lever and related parts.
Fig. 9 is a longitudinal section showing one position of adjustment.
Fig. 10 is a similar view showing the
40 parts in another position of adjustment.
Fig. 11 is a transverse section of a third embodiment of the invention.
Fig. 12 is a longitudinal section through the shift fork and rod.
45 Fig. 13 is a view as seen from line 13—13 on Fig. 11. Fig. 14 is a top plan view of the operating parts used in still another embodiment.
Fig. 15 is a view in elevation, partly in
50 section, the view being at right angles to that of Fig. 14.
Fig. 16 is a view in elevation, partly in section, of still another embodiment.
Fig. 17 is a longitudinal section showing the parts in one position of adjustment.
Fig. 18 is a similar view with the parts in a second position of adjustment.
Fig. 19 is a similar view with the parts slightly moved from their neutral position.
Fig. 20 is a perspective of certain parts in disassembled relation.
In Fig. 1 a change speed housing is represented by numeral 17. Within the housing are slidable rods 19 and 21. These rods carry substantially conventional shift forks 23 and 25. Extending through the top 27 of the housing is a shift lever 29. Within the housing and just beneath the top is a guide bar 31 which is secured to the top as at 33. The guide bar has a central opening 35 to permit free movement of the lever 29. The guide bar 31 has down-turned ends 37 received within slots 39 provided in the ends of an interlocking bar 41. This bar 41 is moved transversely by the transverse movements of lever 29, the latter extending through an opening 43 therein. As is usual in such constructions, the opening 43 has a sufficient longitudinal extent, not shown in the drawings, to permit the necessary longitudinal movements of the lever. Because of the end engagement of bar 41 with the guide bar 31, the former is restricted to transverse movements only. Lever 29 is received within an opening 45 of an operating lever 47.
From Fig. 1 it will be seen that the opening 45 is such as to provide lever 29 with the freedom for limited transverse movement. There is no provision for longitudinal movement between the lever 29 and the lever 47. The ends of lever 47 rest on flat surfaces 49 of the two forks 23 and 25 and project between upstanding lugs on the said forks. On fork 25 these lugs are designated by numerals 51 and 53. At each end of lever 47 is an upstanding pin 55.
When lever 29 is moved transversely it moves the interlocking plate 41 in the same direction. There are notches in the bases of the slots 39 to be engaged by the one or the other of the pins 55. For example, if lever
  
  


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