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US 6,916,032 B2Granted
Manually-propelled vehicle and related systems
AssigneeJ.T. Labs, Ltd.
InventorSui-Kay Wong
Life of this patent
Estimating the term…
Abstract
The invention provides a propulsion, braking and anti-rollback control assembly for use in manually propelled vehicles such as wheelchairs. In one embodiment, the invention provides a wheelchair with a control lever assembly and related force conveyance connecter that propel, brake and steer the wheelchair in a mechanically advantageous way while minimizing rollback. A seat-activated auxiliary braking system is also provided. Additionally, the invention provides a selective anti-rollback disengagement system that facilitates selective rollback.
Claims19
A propulsion, braking and steering control assembly for installation on a manually propelled vehicle, said vehicle comprising a frame, a front steering wheel assembly having at least two pivoting steering wheels having front steering wheel shafts, a rear drive wheel assembly comprising at least one drive wheel mounted for rotation on a rear drive wheel shaft, a single direction engagement apparatus axially mounted on said rear drive wheel shaft for translation of a propulsive force, an anti-rollback apparatus axially mounted on said rear drive wheel shaft and an axially mounted braking disc mounted on said shaft, said front steering and rear drive wheel assemblies supporting said frame and enabling movement of the vehicle, a footrest positioned within said frame above said front steering wheel assembly, said front steering wheel shafts being pivotally attached to the frame below the of said foot rest, and a seat constructed and oriented to support an occupant and mounted for limited horizontal sliding on the frame through roller and rail or linear bearing means, and a control assembly, said control assembly comprising:
- (a) a control lever assembly which is pivotally mounted to the top of the footrest and which has a plurality of engagement sites which extend along its length, said control lever assembly being connected by a brake actuator to said braking disc;
- (b) a sleeve which is disposed for movement on the exterior of the control lever assembly, said sleeve having a plurality of engagement sites which extend along the length of the sleeve and which may be positioned to overlap one or more of the engagement sites of the control lever assembly;
- (c) a force conveyance connecter which is affixed at one end to the sleeve and at the other end to said single direction engagement apparatus;
- and
- (d) a rotating steering column which extends through and is disposed for movement within the control lever assembly, and which (i) engages and turns one of said front steering wheels through connection by a flexible joint to a front steering wheel shaft, and (ii) which has an engager which may, through movement of the steering column, be positioned to engage simultaneously an engagement site of both the sleeve and control lever assembly and thereby lock the sleeve at a fixed position along the control lever assembly, wherein,
- (1) an increasing propulsive force is translated from the force conveyance connecter through the single direction engagement apparatus to the rear drive wheel shaft by pushing the control lever assembly forward from a vertical position when said steering column has been adjusted to lock the sleeve in a position along the control lever assembly closer to the pivot mounting near footrest,
- (2) pulling the control lever assembly in a backwards direction from a vertical orientation applies a braking force to the drive wheel shaft, and
- (3) the vehicle may be steered through movement of the steering column during propulsion or braking.
5 more elements
A manually propelled vehicle comprising:
- a frame, a front steering wheel assembly having at least two pivoting steering wheels having steering wheel shafts, a rear drive wheel assembly comprising at least one drive wheel mounted for rotation on a rear drive wheel shaft, a single direction engagement apparatus axially mounted on said rear drive wheel shaft for translation of a propulsive force, an anti-rollback apparatus axially mounted for engagement on said rear drive wheel shaft, an axially mounted braking disc mounted on said shaft, said front steering and rear drive wheel assemblies supporting said frame and enabling movement of the vehicle, a footrest positioned within said frame above said front steering wheel assembly, said front steering wheel shafts being pivotally attached to the frame below the footrest, and a seat constructed and oriented to support an occupant and mounted for limited horizontal sliding on the frame, an auxiliary braking system actuated by sliding the seat along the frame, said auxiliary braking system comprising a lever pivotally mounted on the frame which is flexibly engaged to the bottom of the seat such that forward movement of the seat along the frame causes the lever to pivot and engage or disengage contact between braking pads rotationally mounted on the bottom of the lever and the rear drive wheel, and a control assembly, said control assembly comprising:
- (a) a control lever assembly which is pivotally mounted to the frame near the footrest and which has a plurality of engagement sites which extend along its length, said control lever assembly being connected by a brake actuator to a rear drive wheel braking mechanism that engages the rear drive wheel shaft for braking;
- (b) a sleeve which is disposed for movement on the exterior of the control lever assembly, said sleeve having a plurality of engagement sites which extend along the length of the sleeve and which may be positioned to overlap one or more of the engagement sites of the control lever assembly;
- (c) a force conveyance connecter which is affixed at one end to the sleeve and at the other end to said single direction engagement apparatus;
- and
- (d) a rotating steering column which extends through and is disposed for movement within the control lever assembly, and which (i) engages and turns one of said front steering wheels through connection by a flexible joint to said front drive wheel shafts, and (ii) an engager which may, through movement of the steering column, be positioned to engage simultaneously an engagement site of both the sleeve and control lever assembly and thereby lock the sleeve at a fixed position along the control lever assembly wherein,
- (1) an increasing propulsive force is translated from the force conveyance connecter through the single direction engagement apparatus to the rear drive wheel shaft by pushing the control lever assembly forward from a vertical position when said steering column has been adjusted to lock the sleeve in a position along the control lever assembly closer to the pivot mounting near the footrest,
- (2) pulling the control lever assembly in a backwards direction from a vertical orientation applies a braking force to the drive wheel shaft, and
- (3) the vehicle may be steered through movement of the steering column during propulsion or braking.
6 more elements
A manually propelled vehicle comprising:
- a frame, a front steering wheel assembly having at least two pivoting steering wheels having steering wheel shafts, a rear drive wheel assembly comprising at least one drive wheel mounted for rotation on a rear drive wheel shaft, a single direction engagement apparatus axially mounted on said rear drive wheel shaft for translation of a propulsive force, an anti-rollback apparatus axially mounted for engagement on said rear drive wheel shaft, an axially mounted braking disc mounted on said shaft, said front steering and rear drive wheel assemblies supporting said frame and enabling movement of the vehicle, a footrest positioned within said frame above said front steering wheel assembly, said front steering wheel shafts being pivotally attached to the frame below the bottom of said footrest, and a seat constructed and oriented to support an occupant and mounted for limited horizontal sliding on the frame, an auxiliary braking system actuated by sliding the seat along the frame, said auxiliary braking system comprising a hydraulic piston connected to an auxiliary braking disc mounted on the rear drive wheel, said piston actuating the auxiliary braking disc when the seat slides forward, and a control assembly, said control assembly comprising:
- (a) a control lever assembly which is pivotally mounted to the frame near the footrest and which has a plurality of engagement sites which extend along its length, said control lever assembly being connected by a brake actuator to a rear drive wheel braking mechanism that engages the rear drive wheel shaft for braking;
- (b) a sleeve which is disposed for movement on the exterior of the control lever assembly, said sleeve having a plurality of engagement sites which extend along the length of the sleeve and which may be positioned to overlap one or more of the engagement sites of the control lever assembly;
- (c) a force conveyance connecter which is affixed at one end to the sleeve and at the other end to said single direction engagement apparatus;
- and
- (d) a rotating steering column which extends through and is disposed for movement within the control lever assembly, and which (i) engages and turns one of said front steering wheels through connection by a flexible joint to said front drive wheel shafts, and (ii) an engager which may, through movement of the steering column, be positioned to engage simultaneously an engagement site of both the sleeve and control lever assembly and thereby lock the sleeve at a fixed position along the control lever assembly wherein,
- (1) an increasing propulsive force is translated from the force conveyance connecter through the single direction engagement apparatus to the rear drive wheel shaft by pushing the control lever assembly forward from a vertical position when said steering column has been adjusted to lock the sleeve in a position along the control lever assembly closer to the pivot mounting near the footrest,
- (2) pulling the control lever assembly in a backwards direction from a vertical orientation applies a braking force to the drive wheel shaft, and
- (3) the vehicle may be steered through movement of the steering column during propulsion or braking.
6 more elements
A manually propelled vehicle comprising:
- a frame, a front steering wheel assembly having at least two pivoting steering wheels having steering wheel shafts, a rear drive wheel assembly comprising at least one drive wheel mounted for rotation on a rear drive wheel shaft, a single direction engagement apparatus axially mounted on said rear drive wheel shaft for translation of a propulsive force, an anti-rollback apparatus axially mounted for engagement on said rear drive wheel shaft, an axially mounted braking disc mounted on said shaft, said front steering and rear drive wheel assemblies supporting said frame and enabling movement of the vehicle, a footrest positioned horizontally within said frame above said front steering wheel assembly, said front steering wheel shafts being pivotally attached to the frame below the said footrest, and a seat constructed and oriented to support an occupant and mounted for limited horizontal sliding on the frame, said vehicle further comprising:
- (a) auxiliary braking system which applies a braking force to the rear drive wheel shaft, said auxiliary braking system being actuated when the seat slides forward along the frame,
- (b) a control assembly mounted on the frame near the footrest for propulsion, braking and steering, said control assembly (i) conveying a propulsive force through a force conveyance connector to the rear drive wheel shaft when pushed forward, (ii) conveying a braking force through the force conveyance connector to the rear drive wheel shaft when pulled back, and (iii) being engaged for steering to a steering wheel shaft, and
- (c) an anti-rollback disengagement system mounted on the frame or the control assembly for selective disengagement of the single direction engagement apparatus and anti-rollback apparatus.
1 more element
Dependencies are inferred from the claim text.