Pneumatic remote speed control device for marine engine |
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| 申请号 | US3772937D | 申请日 | 1971-08-10 | 公开(公告)号 | US3772937A | 公开(公告)日 | 1973-11-20 |
| 申请人 | NIPPON AIR BRAKE CO; | 发明人 | TAKAGI M; NITTA A; | ||||
| 摘要 | A cam mechanism geared to the operating handle of a remotely located operator''s speed controller for a marine engine, said cam mechanism including cam means operable by movement of the operator''s handle to various positions for transmitting a corresponding degree of movement through a lever arrangement to the operating stem of a fluid pressure operable control valve device which remotely controls the speed of the engine. | ||||||
| 权利要求 | 1. In combination with a lever system of the type for operating a control device, a cam mechanism comprising: a. a rotatable shaft; b. a main cam comprising: i. a cylindrical cam support member mounted on said shaft for rotation therewith; and ii. a cam surface having a contour selectively formable on said cylindrical cam support member adjacent one of the annular extremities thereof; c. a plurality of cam elements individually axially adjustably secured in abutting side-by-side fashion on the outer cylindrical surface of said cam support member and projecting axially beyond said one of said annular extremities to form said cam surface according to a selected contour; d. a main cam follower carried by said lever system in position for making contact with said cam surface; e. manually operable means selectively operable to a plurality of positions for effecting rotation of said shaft and said main cam to a corresponding plurality of angular positions, f. said main cam follower being operable, upon operation of said main cam to a selected position, for effecting movement of said lever system and consequent operation of the control device to a degree commensurate with said selected position to which the main cam is operated; and wherein the improvement comprises: g. said cylindrical cam support member being axially positionally adjustable on said shaft for varying the position of said cam support member relative to said lever system and consequently the cooperative action between said main cam and said lever system. 2. The combination, as set forth in claim 1, wherein said main cam follower is maintained in constant contact with said cam surface and said combination is further characterized by: a. biasing means for axially biasing said cam support member in one direction away from said lever system toward a first limiting position; and b. auxiliary means for effecting axial movement of said cam support member in an opposite direction in opposition to said biasing means to a selected one of a plurality of positions between said first limiting position and a second limiting position toward said lever system. 3. The combination, as set forth in claim 2, wherein said auxiliary means comprises: a. a lever member pivotable about a fixed point intermediate the ends thereof with one end of said lever member bearing against the other of said annular extremities of said cylindrical cam support member for exerting an axial force on the cam support member, according to the amount of rotation of said lever member about said fixed point, for effecting a corresponding degree of said axial movement of said cam support member in said opposite direction. 4. The combination, as set forth in claim 3, further characterized by: a. an auxiliary cam follower mounted on the end opposite said one end of said lever member; and b. an auxiliary cam operatively contacting said auxiliary cam follower and operable for effecting said rotation of the lever member about said fixed point. 5. Speed control apparatus for operating a speed control device of a marine engine, said apparatus comprising: a. an operator''s control handle rotatable in opposite directions out of a neutral position to a plurality of forward and reverse positions for effecting speed control of the engine according to the amount of rotation of said handle; b. a rotatable shaft; c. drive means interconnecting said operator''s handle with said shaft for effecting rotation of the shaft according to the rotation of the handle; d. a cylindrical cam member carried on said shaft for rotation therewith and having formed at one end thereof an axially disposed cam surface; e. a plurality of cam elements individually axially adjustably arranged on the outer cylindrical surface of said cylindrical cam member adjacent one axial extremity thereof in abutting side-by-side fashion and projecting axially beyond said axial extremity to form said cam surface of variable preselected contour; and f. operating means rotatable about a fixed axis for effecting operation of the speed control device according to the extent of rotation of said operating means, said operating means including a cam follower in position for contacting said cam surface and effecting rotating motion of said operating means to a degree commensurate with the degree of rotation of said cam member; and wherein the improvement comprises: g. said cam member being slidably adjustable on said shaft for varying the axial position thereof relative to said operating means and consequently the degree of relative motion imparted to the operating means through the cam follower upon rotation of said cam member. 6. Speed control apparatus, as set forth in claim 5, wherein said drive means comprises: a. a first sprocket gear coaxially mounted on said operator''s control handle for rotation therewith; b. a second sprocket gear concentrically secured to said shaft; and c. a sprocket drive chain drivingly connecting said first and second sprocket gears. 7. Speed control apparatus, as set forth in claim 5, further characterized by: a. biasing means for axially biasing said cam member in one direction on said shaft; and b. auxiliary cam means for effecting axial movement of said cam member on said shaft in a direction opposite to said one direction in opposition to said biasing means. |
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