Access ramp having self-contained hydraulics and improved bushing assembly

A method of assembling a wheelchair ramp subassembly and attaching same to a vehicle having wheelchair access and having a vehicle hydraulic system, said method comprising the steps of:

• providing a wheelchair ramp subassembly frame;
• providing a ramp pivotably attached relative to said frame;
• providing an electrically driven motor which drives a hydraulic pump assembly, both items attached relative to said wheelchair ramp subassembly frame;
• providing a rotary actuator attached to said wheelchair ramp subassembly frame;
• providing ramp hydraulics which form a closed system with said hydraulic pump assembly and said rotary actuator, said ramp hydraulics not to be commingled with said vehicle hydraulic system;
• installing said wheelchair ramp subassembly frame, said electrically driven motor, said hydraulic pump assembly, said rotary actuator, and said ramp hydraulics, all as a modular unit to said vehicle;
• and
• connecting electrical power to said electrically driven motor, such that said electrically driven motor can drive said hydraulic pump, and said hydraulic pump can pressurize the ramp hydraulics such that said rotary actuator operates said pivoting ramp.

A wheelchair ramp subassembly for use with a vehicle configured to provide wheelchair access, said vehicle including a wheelchair mounting location and also including vehicle hydraulics and hydraulic lines, and said wheelchair ramp assembly comprising:

• a ramp frame;
• an electrically powered hydraulic pump assembly attached to frame;
• hydraulic pump assembly controls having control lines;
• and
• a self-contained ramp hydraulic system operably associated with said hydraulic pump assembly,
• such that said frame of said wheelchair ramp assembly is configured to be attached to said vehicle in a modular manner and such that said wheelchair ramp assembly is operable simply by attaching said electrical and control lines to said vehicle, and without the connection of said ramp hydraulic lines with said vehicle hydraulics.

A method of assembling a wheelchair ramp subassembly and attaching same to a vehicle having wheelchair access and having a vehicle hydraulic system, said method comprising the steps of:

• providing a wheelchair ramp subassembly frame;
• providing a ramp pivotably attached relative to said frame;
• providing an electrically driven motor which drives a hydraulic pump assembly, both items attached relative to said wheelchair ramp subassembly frame;
• providing a rotary actuator attached to said wheelchair ramp subassembly frame;
• providing ramp hydraulics which form a closed system with said hydraulic pump assembly and said rotary actuator, said ramp hydraulics not to be commingled with said vehicle hydraulic system;
• installing said wheelchair ramp subassembly frame, said electrically driven motor, said hydraulic pump assembly, said rotary actuator, ramp hydraulics, all as a modular unit to said vehicle;
• and
• connecting electrical power to said electrically driven motor, such that said electrically driven motor can drive said hydraulic pump, and said hydraulic pump can pressurize the ramp hydraulics such that said rotary actuator operates said pivoting ramp.

A method of assembling a wheelchair ramp subassembly and attaching same to a vehicle having wheelchair access, having a vehicle hydraulic system, and having an electrical system, said method comprising the steps of:

• providing a wheelchair ramp subassembly which includes as an input electrical power, and as an output the control of a pivoting wheelchair ramp to allow selective retraction and extension of said ramp, said wheelchair ramp subassembly including internal, self-contained hydraulics which are not connected to said vehicle hydraulic system;
• installing said wheelchair ramp subassembly to said vehicle;
• connecting said electrical system of said vehicle to said electrical input of said wheelchair ramp subassembly;
• and
• operating said wheelchair ramp subassembly between a retracted and an extended position.

A wheelchair ramp assembly for use with a vehicle, said ramp assembly including:

• a frame member;
• a ramp member pivotably attached relative to said frame member;
• an elongate first linkage member having opposing first and second ends and a longitudinal axis, said first end pivotably attached to one of said frame member and said ramp member;
• said first linkage member defining a transverse bushing hole having an axis substantially perpendicular to said longitudinal axis of said first linkage member
• an elongate second linkage member having opposing first and second ends and a longitudinal axis, said first end pivotably attached to the other of said frame member and said ramp member, said second linkage member defining proximate its second end a transverse bushing hole having an axis substantially perpendicular to said longitudinal axis of said second linkage member, said second linkage member including a transverse pin hole extending through its thickness along the wall, said transverse pin hole having a hole axis being perpindicuar to said longitudinal axis of said second linkage member and also perpendicular to said hole axis of said transverse bushing hole
• a bushing assembly, said bushing assembly itself comprising:
• a main portion, said main portion including a head portion, an intermediate bearing portion, and a fixing portion, said fixing portion including a through transverse bore configured to accept a length of said pin member;
• and
• a pin member configured to extend through said transverse bore of said fixing portion and to extend through said transverse pin hole of said second linkage member, and to provide a frictional connection between said fixing portion and said second linkage member,
• such that when assembled, said pin member attaches said main portion to said second linkage member, and said first linkage member pivots relative to said second linkage member and said main portion.

A wheelchair ramp assembly for use with a vehicle, said ramp assembly comprising:

• a ramp assembly frame configured to be mounted to said vehicle;
• a ramp assembly pivotably attached relative to said frame, said ramp assembly including at least one side wall being substantially platelike and including two opposing primary planar surfaces;
• a first linkage member being substantially platelike and including opposing primary planar surfaces;
• a second linkage member being substantially platelike and including opposing primary planar surfaces;
• and
• first and second substantially similar bushing members, each of said bushing members having a head portion defining a top face,
• said first bushing member mounted such that its top face is substantially flush with said outside primary planar surface of said side wall,
• said second bushing member mounted such that its top face is substantially flush with the primary planar surface of one of said linkage members.

A wheelchair ramp assembly for use with a vehicle, said ramp assembly comprising:

• a ramp assembly frame configured to be mounted to said vehicle;
• a ramp assembly pivotably attached relative to said frame, said ramp assembly including at least one side wall being substantially platelike and including two opposing primary planar surfaces;
• a first linkage member being substantially platelike and including opposing primary planar surfaces;
• a second linkage member being substantially platelike and including opposing primary planar surfaces;
• and
• a bushing member having a head portion defining a top face,
• said bushing member mounted such that its top face is substantially flush with the primary planar surface of one of said linkage members.

A wheelchair ramp assembly for use with a vehicle, said ramp assembly comprising:

• a ramp assembly frame configured to be mounted to said vehicle;
• a ramp assembly pivotably attached relative to said frame, said ramp assembly including at least one side wall being substantially platelike and including two opposing primary planar surfaces;
• a first linkage member being substantially platelike and including opposing primary planar surfaces;
• a second linkage member being substantially platelike and including opposing primary planar surfaces;
• and
• a bushing member having a head portion defining a top face,
• said bushing member mounted such that its top face is substantially flush with said outside primary planar surface of said side wall.