Height accessible working platform with horizontally displaceable cradle

1. A height accessible working platform comprising:

an elongated frame having a longitudinal axis attachable to a lifting system for being moveable along a vertical axis and suspended thereto;

a cradle;

a first arm structure having a proximal end terminated to the frame and an distal end attached to the cradle, the first arm structure being extendable and retractable to displace the cradle respectively away from and closer towards one of lateral sides of the frame only along a horizontal axis substantially perpendicular to the vertical axis and the longitudinal axis at a relative first distance of the cradle away from the frame; and

a counterweight mechanism mounting at one lateral side of the frame opposing to the cradle, the counterweight mechanism comprising

a counter load,

a second arm structure having a proximal end terminated to the frame and a distal end attached to the counter load, the second arm structure being extendable and retractable to displace the counter load respectively away from and closer towards the frame along the horizontal axis,

wherein the counterweight mechanism is configured to displace the counter load using the second arm structure along the horizontal axis at a second distance corresponding to a load at the cradle and/or a relative first distance of the cradle away from the frame in a manner to prevent the first arm structure and/or the cradle inclining away from the horizontal axis and/or the frame during extension or retraction of the first arm structure.

2. The working platform of claim 1 further comprising

a first guide located on the frame; and

a cable being routed through the first guide for attaching onto the distal end of the first arm structure to impart a tension force to the first arm structure.

3. The working platform of claim 2 , wherein the first guide is located at a position on the frame relatively higher than the first arm structure such that the routed cable form an acute angle with the first arm structure at the distal end.

4. The working platform of claim 1 further comprising:

a first guide located on the frame and a second guide secured to the first arm structure; and

a cable being routed through the first guide and second guide for attaching onto the distal end of the first arm structure to constantly impart a tension force to the first arm structure, the portion of cable running between the first and second guides forming an acute angle in relation to the horizontal axis, the portion of cable located between the second guide and the distal end of the first arm structure extending in a fashion parallel to the horizontal axis.

5. The working platform of claim 1 further comprising a powered hoist carried by the frame to actuate the first arm structure to extend or retract in relation to the frame.

6. The working platform of claim 1 , wherein the counter load has adjustable weight.

7. The working platform of claim 1 , wherein the second arm structure is an extendable scissors arm.

8. The working platform of claim 1 , wherein the first arm structure is an extendable scissors arm.

9. The working platform of claim 1 , wherein the frame comprises a plurality roller wheels for gliding the platform on a substantially even surface.

10. The working platform of claim 1 further comprising a control panel installed at the cradle for controlling displacement of the cradle along the horizontal axis.

11. A height accessible system for a building comprising:

a powered hoisting assembly installed around rooftop of the building;

a working platform comprising

an elongated frame having a longitudinal axis attached to the hoisting assembly for being moveable along the vertical axis and suspended thereto in front of façade of the building;

a cradle;

a first arm structure having a proximal end terminated to the frame and an distal end attached to the cradle, the first arm structure being extendable and retractable to displace the cradle respectively away from and closer towards one of lateral sides of the frame only along a horizontal axis substantially perpendicular to the vertical axis and the longitudinal axis;

a counterweight mechanism mounting at one lateral side of the frame opposing to the cradle, the counterweight mechanism being configured to balance the working platform corresponding to displacement of the cradle along the horizontal axis;

a first guide located on the frame; and

a cable being routed through the first guide for attaching onto the distal end of the first arm structure to impart a tension force to the first arm structure, wherein the counterweight mechanism is configured to prevent the first arm structure and/or the cradle inclining away from the horizontal axis and/or the frame during extension or retraction of the first arm structure, wherein the counterweight mechanism comprises: a counter load;

a second arm structure having a proximal end terminated to the frame and a distal end attached to the counter load, the second arm structure being extendable and retractable to displace the counter load respectively away from and closer towards the frame along the horizontal axis substantially perpendicular to the vertical axis, the second arm structure being configured to displace the counter load along the horizontal axis at a second distance corresponding to a load at the cradle and/or a relative first distance of the cradle away from the frame in manner to free the platform from tilting.