Articulated suspension off a climbing motorized wheelchair for rough terrains
This invention (including advanced solutions disclosed in issued patent BG 65421 В1), generally relates to personal propulsion devices that are worn on the front of a user attachable to an wheelchair, tri-cycle or other human-powered vehicle, ridden by the user to propel the user and the object. More specifically, this invention relates to various improvements to the configuration of such devices that improve the usefulness and functionality of the device for disable peoples.
The propulsion support unit of U.S. Pat. No. 4,189,019 to Zech, discloses a complex system of levers, springs, turntable and bars on both sides of the users’ body. Both hands and arms are required for controls. The many parts, heavy weight, high cost of manufacturing, hazardous in a fall, and both hands and arms occupied, make this invention less attractive as an alternative form of transportation.
The propulsion means set forth in U.S. Pat. No. 5,222,569 to Martel, discloses a device that imparts thrust “solely to the rear of the pelvic area.” The propulsion device is supported by a pendulum shoulder harness on the user and must be controlled by both hands on a pair of grips and pivoting handles along both sides of the user. The device is located below the axis centered on the pelvic region and the user may not sit in an wheelchair or bicycle car. Further more the users hands would be unavailable to grasp the required maneuvering implements such as paddles, brakes, handle bars, wheels of the wheelchair etc.
The current invention will overcome the above referenced hand and arm requirements. It will allow hands free operation and control of a simple light weight, efficient, economical, device that is adjustable up and down the user’s back. The current invention eliminates the need for any side bar for control. In the simple case – see pictures and video – the propulsion device is foldable and the wheelchair is foldable, as well. In this case a disable man can operate by one hand only with out any sophisticated control units.
An articulated suspension system resiliently supports a wheelchair. The system includes a suspension mount having an upper shackle and a link arm mount. The link arm mount of the suspension mount has an upper pivot and a lower pivot. An axle tube is configured to rotatably support a pair of rear wheels, and an axle tube clamp engages an end of the axle tube. The axle tube clamp has a pivot and a lower shackle. The axle tube includes a link arm tube mount having a pivot. An upper link arm is supported for pivoting movement between the link arm mount upper pivot and the link arm tube mount pivot. A lower link arm is supported for pivoting movement between the link arm mount lower pivot and the axle tube clamp pivot. A resilient member is pivotally connected between the upper and lower shackles.
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March 11th, 2012
Bulrate