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Several new and useful concepts for a manually propelled vehicle such as a wheel chair are provided. In one concept, the vehicle is configured to be selectively placed in an automatic lock condition in which (i) the wheel chair can move in a conventional manner while an occupant is seated in the whe

Several new and useful concepts for a manually propelled vehicle such as a wheel chair are provided. In one concept, the vehicle is configured to be selectively placed in an automatic lock condition in which (i) the wheel chair can move in a conventional manner while an occupant is seated in the wheel chair, and (ii) the wheel chair is automatically locked against movement when an occupant begins to rise from a seated position on the wheel chair. In another concept, a particularly secure structure is provided for locking the wheel of the wheel chair against movement. In yet another concept, important components of the wheel chair are formed in a manner that facilitates assembly of those components into the wheel chair, by an internal fastening system and in a modular fashion.

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1. A manually propelled vehicle such as a wheel chair that is configured to be selectively placed in an automatic lock condition in which (i) the vehicle can move in a conventional manner while an occupant is seated in the vehicle, and (ii) the vehicle is automatically locked against movement when a

1. A manually propelled vehicle such as a wheel chair that is configured to be selectively placed in an automatic lock condition in which (i) the vehicle can move in a conventional manner while an occupant is seated in the vehicle, and (ii) the vehicle is automatically locked against movement when an occupant begins to rise from a seated position on the vehicle, wherein the vehicle has an automatic braking assembly that has a cocked position in which an auto lock brake device is disengaged from the wheel of the vehicle, and is automatically moved to a locked condition in which it locks the vehicle against movement when an occupant begins to rise from a seated position on the vehicle, wherein the vehicle includes a seat rail disposed over a chair rail, the seat rail resting on the chair rail when an occupant is seated in the vehicle and the automatic braking assembly is in the cocked position, and the seat rail being automatically pivoted relative to the chair rail when an occupant begins to rise from a seated position and when the seat rail pivots relative to the chair rail the auto lock brake device is automatically moved to the locked condition. 2. The vehicle of claim 1, wherein the automatic braking assembly includes a tension spring that is being held in tension that is released and causes the auto lock brake device to lock the vehicle against movement when an occupant begins to rise from the vehicle, and wherein the automatic braking assembly is configured to be manipulated to establish and hold the tension spring in tension while the seat rail is resting on the chair Tail, and tension in the tension spring is released when the occupant begins to rise from the vehicle and the seat rail is automatically pivoted relative to the chair rail. 3. The vehicle of claim 2, wherein the vehicle comprises a wheel chair, the seat and chair rails are continuously biased to separate at a predetermined location and can be compressed toward each other against the bias to a compressed condition, a latch is provided that can be selectively moved to a latching position in which it latches the seat and chair rails in a compressed condition, wherein the automatic braking assembly can be manipulated to a released condition in which the wheel is not locked when the seat and chair rails are latched in the compressed condition, wherein the wheelchair is configured to be manipulated in a traditional fashion when the seat and chair rails are latched in the compressed condition, and wherein the latch can be released from the latching position when it is desired to place the automatic braking assembly in an operating condition, whereby separation of the seat and chair rails under the bias causes the automatic braking assembly to engage the wheel and lock the wheelchair against movement. 4. The vehicle of claim 3, wherein the chair rail and the seat rail are each formed of relatively rigid members that can be assembled without welding. 5. The vehicle of claim 4, wherein the relatively rigid members that form the chair rail and the seat rail are comprised of extruded aluminum members. 6. A manually propelled vehicle such as a wheel chair that is configured to be selectively placed in an automatic lock condition in which (i) the vehicle can move in a conventional manner while an occupant is seated in the vehicle, and (ii) the vehicle is automatically locked against movement when an occupant begins to rise from a seated position on the vehicle, wherein an auto lock brake device can be brought into contact with a wheel of the vehicle to lock the wheel movement, wherein the manually propelled vehicle comprises a plurality of frame components that are connected to each other by mechanical fasteners in a configuration that forms a Wheelchair frame, at least some of the frame components being connected to each other by an internal fastening system that includes one or more mechanical fasteners connecting the frame components while being substantially internally located in the frame components, further including chair and seat rails that are connected to each other and assembled with the frame in a manner that enables the chair and seat rails to pivot relative to each other while assembled with the frame. 7. The manually propelled vehicle of claim 6, wherein the chair and seat rails support the auto brake device.