Gear shift device

A gear shift device for a six-speed transmission having a reverse R-gear, first and second forward gears in one shift path, a set of low-speed gears forming third and fourth forward gears with a neutral position therebetween along a first shift path between said low-speed gears, a set of high-speed gears forming fifth and sixth forwards gears with a neutral position therebetween along a second shift path between said high-speed gears, and a gear-shift lever shiftable along a generally H-shaped shifting path between said sets of gears and said neutral positions, said device comprising:

• a member displaceable by said lever upon its movemen between said gears and said positions for operating said transmission to select a gear thereof, said member being norm returned to said neutral position of said set of low-speed gear and
• a retention device including detent means acting on said member and constructed and arranged upon displacement of said member toward said sixth gear to retain said member in a position in which said lever is held in said second shift path upon its release by an operator of the transmission, and upon displacement of said member toward said fifth gear to release said member and permit said lever to return to said first shift path upon its release to said neutral position of said second shift path said retention device including a rail provided with said detent means and said member is a shifting shaft synchronously slidable with said rail.

A gear shift device for a six-speed transmission having a reverse R-gear, first and second forward gears in one shift path, a set of low-speed gears forming third and fourth forward gears with a neutral position therebetween along a first shift path between said low-speed gears, a set of high-speed gears forming fifth and sixth forwards gears with a neutral position therebetween along a second shift path between said high-speed gears, and a gear-shift lever shiftable along a generally H-shaped shifting path between said sets of gears and said neutral positions, said device comprising:

• a member displaceable by said lever upon its movement between said gears and said positions for operating said transmission to select a gear thereof, said member being normally returned to said neutral position of said set of low-speed gears;
• and
• a retention device including detent means acting on said member and constructed and arranged upon displacement of said member toward said sixth gear to retain said member in a position in which said lever is held in said second shift path upon its release by an operator of the transmission, and upon displacement of said member toward said fifth gear to release said member and permit said lever to return to said first shift path upon its release to said neutral position of said second shift path member by a shaft having a shift finger affixed thereto and cooperating with said retention device, said retention device comprising a slider plate formed with a slot and constructed and arranged so that upon displacement of said shift lever into fifth gear, said plate is not translated but upon displacement of said lever into sixth gear, said plate is translated by said finger engaging in said slot, said plate being formed with an inclined slot receiving a pin connected to a slider coplanar with said finger and said plate but having a direction of movement lying substantially at 90.degree. to the direction of translation of said plate and positioned to lock said member against displacement, said detent means including a spring-loaded detent member engageable with said slider but displaceable upon forced displacement of said gear-shift lever to retain said member in said second shift path unless said detent member is forced by movement of said gear shift lever toward said first gear path.

A gear shift device for a six-speed transmission having a reverse R-gear, first and second forward gears in one shift path, a set of low-speed gears forming third and fourth forward gears with a neutral position therebetween along a first shift path between said low-speed gears, a set of high-speed gears forming fifth and sixth forwards gears with a neutral position therebetween along a second shift path between said high-speed gears, and a gear-shift lever shiftable along a generally H-shaped shifting path between said sets of gears and said neutral positions, said device comprising:

• a member displaceable by said lever upon its movement between said gears and said positions for operating said transmission to select a gear thereof, said member being normally returned to said neutral position of said set of low-speed gears;
• and
• a retention device including detent means acting on said member and constructed and arranged upon displacement of said member toward said sixth gear to retain said member in a position in which said lever is held in said second shift path upon its release by an operator of the transmission, and upon displacement of said member toward said fifth gear to release said member and permit said lever to return to said first shift path upon its release to said neutral position of said second shift path said member by a rotatable shaft and said retention device including a pivotable lever engageable in an annular groove of said shaft and having a finger projecting into said groove for retention of said member in said position in which said gear shift lever is held in said second shift path, said detent means including a detent engageable with said pivotable lever, said shaft having a member engageable with said pivot lever to swing the same into said groove in one pivoting direction of said shaft and into said groove in another pivoting direction of said shaft.