Transmission valve neutralized by brake application

Claim 1

A device for controlling a change-over valve having a valve housing and a valve spool selectively placed into one of forward, neutral and reverse positions, comprising a bifurcated base member having spaced arms and fixedly secured to said valve housing; support axis extending between said arms of said base member; a first manually operable lever pivotally supported by said support axis; a second lever similarly pivotally supported by said support axis, said second lever being provided with a bifurcated engaging portion engaging said valve spool; each of said first and second levers being provided with arms extending in opposite directions; a pair of spring means stretched between one pair of arms of said first and second levers and between the other pair of arms of said first and second levers, each arm pair extending in the same direction, said pair of spring means allowing said second lever to be turned about said support axis with said first lever when said first lever is manually turned, thereby to place said valve spool in a selected one of said three positions; locking means disposed between said first lever and said base member for locking said first lever therewith to prevent its being turned by said second lever; a third manually operable lever pivotally supported by said base member; and cam means fixedly secured to said third lever at one portion thereof and turnably mounted on said base member at another portion thereof, said cam means further being engaged with sAid second lever so as to operate said second lever according to the turn of the third lever.

Claim 2

A device for controlling a change-over valve having a valve housing and a valve spool selectively placed into one of forward, neutral and reverse positions, comprising a bifurcated base member having spaced arms and fixedly secured to said valve housing; support axis extending between said arms of said base member; a first manually operable lever pivotally supported by said support axis; a second lever similarly pivotally supported by said support axis, said second lever being provided with a bifurcated engaging portion engaging said valve spool; each of said first and second levers being provided with arms extending in opposite directions; a pair of spring means stretched between one pair of arms of said first and second levers and between the other pair of arms of said first and second levers, each arm pair extending in the same direction, said pair of spring means allowing said second lever to be turned about said support axis with said first lever when said first lever is manually turned, thereby to place said valve spool in a selected one of said three positions; locking means disposed between said first lever and said base member for locking said first lever therewith to prevent its being turned by said second lever; a third manually operable lever pivotally supported by said base member; and cam means fixedly secured to said third lever at one portion thereof and turnably mounted on said base member at another portion thereof, said cam means further being engaged with sAid second lever so as to operate said second lever according to the turn of the third lever.

Claim 3

A device for controlling a change-over valve having a valve housing, comprising a first manually operable lever pivotally connected to said valve housing, a second lever pivoted on said valve housing coaxially with said first lever, said second lever being provided with an engaging portion engaging said change-over valve, a pair of resilient transmitting means disposed, respectively, between said first and second levers for transmitting pivotal motion of the first lever to said second lever, means positioned between said first lever and said valve housing for locking said first lever with said valve housing to prevent its being turned by said second lever, a third lever turnable by manual operation, and cam means fixedly secured to said third lever at one portion and turnably mounted to said valve housing at another portion thereof, said cam means further being engaged with said second lever so as to operate said second lever according to the turn of said third lever, said cam means including a curvedly elongated groove having concentric cam surfaces with either of which a cam follower fixedly secured to said second lever is in contact engagement upon movement of said cam means, the radius of curvature of said groove being substantially equal to the radius of turn of said follower.

Claim 4

A device for controlling a change-over valve having a valve housing, comprising a first manually operable lever pivotally connected to said valve housing, a second lever pivoted on said valve housing coaxially with said first lever, said second lever being provided with an engaging portion engaging said change-over valve, a pair of resilient transmitting means disposed, respectively, between said first and second levers for transmitting pivotal motion of the first lever to said second lever, means positioned between said first lever and said valve housing for locking said first lever with said valve housing to prevent its being turned by said second lever, a third lever turnable by manual operation, and cam means fixedly secured to said third lever at one portion and turnably mounted to said valve housing at another portion thereof, said cam means further being engaged with said second lever so as to operate said second lever according to the turn of said third lever, said cam means including a curvedly elongated groove having concentric cam surfaces with either of which a cam follower fixedly secured to said second lever is in contact engagement upon movement of said cam means, the radius of curvature of said groove being substantially equal to the radius of turn of said follower.

Claim 5

A device for controlling a change-over valve having a valve housing, comprising a support axis mounted to said valve housing, a first manually operable lever pivotally connected to said valve housing by said support axis, a second lever pivoted on said valve housing coaxially with said first lever by said support axis and having opposite ends, said second lever being provided at one of said ends thereof with an engaging portion engaging said change-over valve, a pair of resilient transmitting means disposed between said first and second levers at zones spaced radially in opposite directions from said support axis for transmitting pivotal motion of the first lever to said second lever, means positioned between said first lever and said valve housing for locking said first lever with said valve housing to prevent its being turned by said second lever, a third lever turntable by manual operation, and cam means fixedly secured to said third lever at one portion and turnably mounted to said valve housing at another portion thereof, and a cam follower fixedly secured to the other end of said second lever and engageable with said cam means so as to operate said change-over valve according to the turn of said third lever through said engaging portion of said second lever.

Claim 6

A device for controlling a change-over valve having a valve housing, comprising a support axis mounted to said valve housing, a first manually operable lever pivotally connected to said valve housing by said support axis, a second lever pivoted on said valve housing coaxially with said first lever by said support axis and having opposite ends, said second lever being provided at one of said ends thereof with an engaging portion engaging said change-over valve, a pair of resilient transmitting means disposed between said first and second levers at zones spaced radially in opposite directions from said support axis for transmitting pivotal motion of the first lever to said second lever, means positioned between said first lever and said valve housing for locking said first lever with said valve housing to prevent its being turned by said second lever, a third lever turntable by manual operation, and cam means fixedly secured to said third lever at one portion and turnably mounted to said valve housing at another portion thereof, and a cam follower fixedly secured to the other end of said second lever and engageable with said cam means so as to operate said change-over valve according to the turn of said third lever through said engaging portion of said second lever.

Claim 10

A device for controlling a change-over valve having a valve housing, comprising a support axis mounted to said valve housing, a first manually operable lever pivotably connected to said valve housing by said support axis, A second lever pivoted on said valve housing coaxially with said first lever by said support axis and having opposite ends, said second lever being provided at one of said ends thereof with an engaging portion engaging said change-over valve, each of said first and second levers being provided with arms extending in opposite directions, a pair of spring means stretched between one pair of arms of said first and second levers and between the other pair of arms of said first and second levers, each arm pair extending in the same direction, said pair of spring means allowing said second lever to be turned about said support axis with said first lever when said first lever is manually turned, means positioned between said first lever and said valve housing for locking said first lever with said valve housing to prevent its being turned by said second lever, a third lever turnable by manual operation, and cam means fixedly secured to said third lever at one portion thereof and turnably mounted to said valve housing at another portion, said cam means comprising a channel-shaped groove and a trapezoid-shaped groove having divergent cam surfaces, and a cam follower fixedly secured to the other end of said second lever, said cam follower being in contact engagement with either of said cam surfaces upon movement of said cam means so as to operate said second lever according to the turn of the third lever.

Claim 11

A device for controlling a change-over valve having a valve housing, comprising a support axis mounted to said valve housing, a first manually operable lever pivotably connected to said valve housing by said support axis, A second lever pivoted on said valve housing coaxially with said first lever by said support axis and having opposite ends, said second lever being provided at one of said ends thereof with an engaging portion engaging said change-over valve, each of said first and second levers being provided with arms extending in opposite directions, a pair of spring means stretched between one pair of arms of said first and second levers and between the other pair of arms of said first and second levers, each arm pair extending in the same direction, said pair of spring means allowing said second lever to be turned about said support axis with said first lever when said first lever is manually turned, means positioned between said first lever and said valve housing for locking said first lever with said valve housing to prevent its being turned by said second lever, a third lever turnable by manual operation, and cam means fixedly secured to said third lever at one portion thereof and turnably mounted to said valve housing at another portion, said cam means comprising a channel-shaped groove and a trapezoid-shaped groove having divergent cam surfaces, and a cam follower fixedly secured to the other end of said second lever, said cam follower being in contact engagement with either of said cam surfaces upon movement of said cam means so as to operate said second lever according to the turn of the third lever.