Vehicle passenger restraint mechanism

A passenger seat assembly for a passenger vehicle, comprising:

• a fixed seat for carrying a single passenger and having a substantially non-distortable passenger carrying surface that includes a high back with a human headrest portion and a bucket like seat sloping downward from its front toward the back and having raised sides, thereby to form a depressed seat surface to restrain a passenger against sliding out of said seat in any direction by the motion of said vehicle,
• a generally U-shaped unitary restraint arm pivotally attached at its free ends on opposite sides of said seat in its region of said headrest and rotatable thereat with respect to said seat between extreme positions toward and away from said seat, a horizontal middle section on said restraint arm positioned to rest on the passenger's lap and adjoining side arm segments between said horizontal section and said pivotal attachment, said side arms being spaced apart in plan view to permit human passenger's head to pass therethrough and being L-shaped in side view to restrain a passenger's shoulders toward the back of the seat, and
• means connected between said seat and said restraint arm through its said pivotable connection for selectively locking the restraint arm against movement away from said seat at any of a plurality of positions between its said extreme positions, said lcoking means including means operable only by an attendant outside of the vehicle for unlocking said restraint arm whereby the combination of the seat shape, restraint arm shape and locking means accommodates a wide range of passenger sizes with ease of entering and leaving said seat.

A passenger seat assembly for a passenger vehicle, comprising:

• a fixed passenger seat having a high back with a human headrest portion and a bucket like seat with raised sides to restrain a passenger against sideways motion out of said seat,
• a generally U shaped restraint arm pivotally attached at its free ends on opposite sides of said seat in its region of said headrest and rotatable between extreme positions toward and away from said seat, a horizontal middle section of said restraint arm positioned to rest on the passenger's lap and adjoining side arms between said horizontal section and said seat being spaced apart sufficient to permit a human passenger's head to pass therethrough, said restraint arm being surrounded with a soft padding material,
• a hydraulic cylinder and a piston therein slidable therealong from one cylinder end to the other, one of said cylinder and piston being operably attached to said seat and the other of said cylinder and piston being operably attached to said restraint arm in a manner to cause relative motion therebetween when said restraint arm is pivoted between it extreme positions, said movement control means additionally including a liquid transfer path between said one and said another cylinder end and having a fluid control valve therein, thereby to make controllable permissible rotation of said restraining arm by control of said valve, said valve characterized by permitting fluid flow through said fluid path in only one direction or the other in response to a mechanical valve control being positioned in either a first or second position, whereby movement of said restraint arm may only be in one direction for a particular position of said valve,
• mechanical means operably connected between said piston and said cylinder and connected to said mechanical valve control for restraining relative movement of said piston and said cylinder beyond a certain intermediate point when said mechanical valve control is in a position that prevents rotation of said restraint arm in an upward direction, said mechanical means being inoperative when said mechanical valve control is in its position permitting such motion of the restraint arm, whereby a mechanical backup is provided to the hydraulic restraint mechanism.

A passenger seat assembly for a passenger vehicle, comprising:

• a fixed passenger seat having a high back with a human headrest portion and a bucket like seat with raised sides to restrain a passenger against sideways motion out of said seat,
• a generally U-shaped restraint arm pivotally attached at its free ends on opposite sides of said seat in its region of said headrest and rotatable between extreme positions toward and away from said seat, a horizontal middle section of said restraint arm positioned to rest on the passenger's lap and adjoining side arms between said horizontal section and said seat being spaced apart sufficient to permit a human passenger's head to pass therethrough, said restraint arm being surrounded with a soft padding material,
• a hydraulic cylinder attached to the rear surface of said seat in a generally upright position,
• a piston within said hydraulic cylinder movable from one end to the other,
• a shaft attached to said piston and extending completely through said hydraulic cylinder to exit therefrom in a liquid tight manner at opposite ends of the cylinder for all positions of said piston therealong,
• means connecting one end of said shaft operably to said restraint arm for moving said piston from one end of the hydraulic cylinder to the other as said restraint arm is rotated between its extreme upward and downward positions about said pivotable attachment,
• a liquid path external of said cylinder communicating between it opposite ends, thereby permitting fluid flow from one side of the piston to the other in the cylinder as said piston moves back and forth along said cylinder, and
• a control valve in said liquid path, said valve characterized by having two operable states selectable by a mechanical control, one of said states permitting fluid flow in one direction only and the other of said states permitting fluid flow in the opposite direction only, thereby permitting the passenger restraint arm to move only in an upward or a downward direction about said pivotable attachment depending on the position of said control valve.

A passenger seat assembly for a passenger vehicle, comprising:

• a fixed seat for carrying a single passenger and having a high back with a human headrest portion and a bucket like seat sloping downward from it front toward the back and having raised sides all to restrain a passenger against being urged out of said seat by the motion of said vehicle,
• a generally U shaped restraint arm pivotally attached at its free ends on opposite sides of said seat in its region of said headrest and rotatable between extreme positions toward and away from said seat, a horizontal middle section on said restraint arm positioned to rest on the passenger's lap and adjoining arms between said horizontal section and said pivotal attachment being spaced apart to permit a human passenger's head to pass therethrough and to restrain a passenger's shoulders toward the back of the seat,
• means connected between said seat and said restraint arm for selectively holding the restraint arm against movement away from said seat at any of a plurality of positions between its said extreme positions, whereby the combination of the seat shape, restraint arm shape and holding means accommodates a wide range of passenger sizes with ease of entering and leaving said seat, said selective holding means comprising:
• a hydraulic cylinder having a piston movable therealong between opposite ends thereof and a shaft attached to said piston and extending completely through said cylinder and through said opposite ends in a liquid tight manner for all positions of said piston therebetween, one of said cylinder and one of said shaft being fixed with respect to said vehicle and the other of said cylinder and said shaft being attached to said movable restraint mechanism, whereby movement of the restraint mechanism between its extreme passenger restraint and loading positions causes said piston to move between its said opposite ends of the cylinder,
• a fluid path external of said cylinder and connected to carry fluid between said opposite ends of said cylinder,
• fluid control means operably connected as part of said fluid path for permitting fluid to flow in only one direction when actuated into a first mode, that direction being such as to permit said passenger restraint means to move toward said seat but not away from the seat, said fluid control means allowing fluid to flow in an opposite direction when actuated into a second mode,
• a mechanical control operable between two positions relative to said vehicle and connected to actuate said fluid control means into its first and second modes when the mechanical control is, respectively, in its first and second position, and
• means cooperatively connectable with another end of said shaft for mechanically preventing relative movement between said cylinder and said shaft in a direction permitting the restraint mechanism to move beyond a fixed position toward its said loading position when said mechanical control is in its first position, thereby providing a mechanical backup to the hydraulic restraint of the passenger.