Wheelchair with suspension arms
First Claim
Patent Images
1. A wheelchair comprising:
- a base having a left and a right side; and
at least two wheels on each of said left and right sides of the base, the at least two wheels including a motorized wheel and a castor wheel;
wherein each of said wheels is supported by a respective suspension arm, with each suspension arm being pivotally coupled to the base at a pivot axis;
wherein the pivot axes of the suspension arm of the castor wheel and of the suspension arm of the motorized wheel on the left and right side of the wheelchair, respectively, are situated next to each other, horizontally offset, with both of the pivot axes in between the castor and the motorized wheel;
wherein a force transmitting device directly connects the suspension arm of the castor wheel of one side of the base with the suspension arm of the motorized wheel of the same side of the base so that upon upward pivoting of the suspension arm of the castor wheel a downward force is exerted by the suspension arm of the motorized wheel; and
wherein the pivot axes of the suspension arms of the castor wheels are situated at the same height or lower than the axes of rotation of the castor wheels, with respect to the ground, when the motorized wheels and the castor wheels stay on the ground.
3 Assignments
0 Petitions
Accused Products
Abstract
Each wheel (10, 14/20, 24) of the wheelchair (1) is fixed to a suspension arm (11,15/21, 25). A force transmitting device, for example a spring and damper of the wheelchair unit, directly connects two suspension arms situated on the same side of the wheeled conveyance, so that forces exerted on one of the wheels are transmitted to the other wheel. In this way, obstacles can more conveniently be overcome. A further advantage of the wheelchair is that it can be easily upscaled and driving properties can be adjusted according to a user'"'"'s preferences.
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Citations
22 Claims
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1. A wheelchair comprising:
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a base having a left and a right side; and at least two wheels on each of said left and right sides of the base, the at least two wheels including a motorized wheel and a castor wheel; wherein each of said wheels is supported by a respective suspension arm, with each suspension arm being pivotally coupled to the base at a pivot axis; wherein the pivot axes of the suspension arm of the castor wheel and of the suspension arm of the motorized wheel on the left and right side of the wheelchair, respectively, are situated next to each other, horizontally offset, with both of the pivot axes in between the castor and the motorized wheel; wherein a force transmitting device directly connects the suspension arm of the castor wheel of one side of the base with the suspension arm of the motorized wheel of the same side of the base so that upon upward pivoting of the suspension arm of the castor wheel a downward force is exerted by the suspension arm of the motorized wheel; and wherein the pivot axes of the suspension arms of the castor wheels are situated at the same height or lower than the axes of rotation of the castor wheels, with respect to the ground, when the motorized wheels and the castor wheels stay on the ground. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wheelchair, comprising:
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a base having a left side and a right side; and at least two wheels on each of said left and right sides of the base, the at least two wheels including a motorized wheel and a castor wheel; wherein each of said wheels is supported by a respective suspension arm, with each suspension arm being pivotally coupled to the base at a pivot axis; wherein the pivot axes of the suspension arm of the castor wheel and of the suspension arm of the motorized wheel on the left and right side of the wheelchair, respectively, are situated next to each other, horizontally offset, with both of the pivot axes in between the castor and the motorized wheel; wherein a force transmitting device directly connects the suspension arm of the castor wheel of one side of the base with the suspension arm of the motorized wheel of the same side of the base so that upon upward pivoting of the suspension arm of the castor wheel a downward force is exerted by the suspension arm of the motorized wheel; and wherein the base comprises a substantially horizontal loading area for batteries, the loading area being situated at a height with respect to the ground, which is at or lower than the height of axes of rotation of the castor wheel.
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11. A wheelchair comprising:
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a base having a left and a right side; and at least two wheels on each of said left and right sides of the base, the at least two wheels including a motorized wheel and a castor wheel; wherein each of said wheels is supported by a respective suspension arm, with each suspension arm being pivotally coupled to the base at a pivot axis; wherein a force transmitting device directly connects the suspension arm of the castor wheel of one side of the base with the suspension arm of the motorized wheel of the same side of the base so that upon upward pivoting of the suspension arm of the castor wheel a downward force is exerted by the suspension arm of the motorized wheel; and wherein the pivot axes of the suspension arms of the castor wheels are situated at the same height or lower than the axes of rotation of the castor wheels, with respect to the ground, when the motorized wheels and the castor wheels stay on the ground. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A wheelchair, comprising:
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a base having a left side and a right side; and at least two wheels on each of said left and right sides of the base, the at least two wheels including a motorized wheel and a castor wheel; wherein each of said wheels is supported by a respective suspension arm, with each suspension arm being pivotally coupled to the base at a pivot axis; wherein a force transmitting device directly connects the suspension arm of the castor wheel of one side of the base with the suspension arm of the motorized wheel of the same side of the base so that upon upward pivoting of the suspension arms of the castor wheel a downward force is exerted by the suspension arm of the motorized wheel; and wherein the base comprises a substantially horizontal loading area for batteries, the loading area being situated at a height with respect to the ground, which is at or lower than the height of axes of rotation of the castor wheel.
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Specification