Patent Description:
Surgical monitors have been used in operating rooms to provide images to surgeons in the room. Likewise, other wired devices, such as surgical lights, speakers, joysticks, keyboards and cameras, have been used in operating rooms to provide surgical information to a surgeon or other person in the operating room (e.g., images from a camera or patient vital information). Such devices receive and/or provide signals and power to and/or from various supports mounted or provided in the operating room, thereby requiring wiring to extend through supports for such devices to the devices. Such wiring arrangements have necessitated that the rotation of joints of the supports be limited (e.g., using stops to limit rotation) to allow the wiring to extend fully through the supports without subjecting the wiring to excessive and damaging twisting of the wiring. Alternatively, if the rotation of the joints allowed for a larger range of rotation, such arrangements do not allow for a large data transfer rate through the supports to the devices. Thus, there is a need for accommodating wiring in a way which will allow for a large data transfer rate while simultaneously allowing the supports to be fully and easily adjustable.

<CIT> discloses an infinite rotation fiber optic and slip ring joint that can be used in medical devices.

The invention provides a suspension arm assembly according to claim <NUM>. Further embodiments of the invention are provided in the dependent claims.

One or more embodiments of the present invention are illustrated by way of example and should not be construed as being limited to the specific embodiments depicted in the accompanying drawings, in which like reference numerals indicate similar elements.

The specific devices and processes illustrated in the attached drawings, and described in the following specification are simply exemplary embodiments of the inventive concepts. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting.

The reference number <NUM> (<FIG>) generally designates a suspension arm assembly. The suspension arm assembly <NUM> includes a ceiling attachment member <NUM>, a wired medical unit <NUM> and a plurality of arms <NUM> between the ceiling attachment member <NUM> and the wired medical unit <NUM>. The intersections between one of the arms <NUM> and the ceiling attachment member <NUM>, each of the arms <NUM>, and one of the arms <NUM> and the wired medical unit <NUM> allow for infinite rotation. Each intersection also includes an infinite rotation fiber optic and slip ring joint <NUM> (see <FIG> and <FIG>) therein. A cabling system <NUM> transmits data and power through the suspension arm assembly <NUM> to the wired medical unit <NUM> and the infinite rotation fiber optic and slip ring joints <NUM> allow for unlimited rotation of the arms <NUM> and the wired medical unit <NUM>.

The illustrated suspension arm assembly <NUM> is configured to be positioned within a room (e.g., an operating room) and, in the illustrated embodiment, includes the wired medical unit <NUM>, which is configured to provide information to the medical personnel in the room and/or to assist the medical personnel in the room perform various functions. In the illustrated example, the wired medical unit <NUM> includes a display support assembly <NUM> at a distal end of one of the arms <NUM> for supporting a display monitor <NUM> for providing surgical information to a surgeon or other person in the operating room (e.g., images from a camera (e.g., an in-light camera or an endoscopic camera) or patient vital information). It is contemplated that other items (e.g., surgical lights, dual displays, cameras, microphones, etc.) in addition to or instead of the display monitor <NUM> can be located at the end of the suspension arm assembly <NUM> such that the data stream can be from or to the item at the end of the suspension arm assembly.

In the illustrated example, the suspension arm assembly <NUM> is connected to a ceiling and supports the wired medical unit <NUM> above a support surface, such as a floor. The suspension arm assembly <NUM> includes the ceiling attachment member <NUM>, a first one of the arms <NUM> in the form of an extension arm <NUM> connected to the ceiling attachment member <NUM> at a first infinite rotation joint <NUM>, a second one of the arms <NUM> in the form of a load counterbalancing spring arm <NUM> connected to the extension arm <NUM> by a second infinite rotation joint <NUM>, and the display support assembly <NUM> connected to the load counterbalancing spring arm <NUM> with a third infinite rotation joint <NUM>. While the suspension arm assembly <NUM> is illustrated as having two arms <NUM>, it is contemplated that the suspension arm assembly <NUM> could have any number of arms <NUM> (including only one arm <NUM>). Furthermore, while particular configurations of infinite rotation joints having the infinite rotation fiber optic and slip ring joint <NUM> are described below, it is contemplated that any configuration of infinite rotation joints having the infinite rotation fiber optic and slip ring joint <NUM> therein could be used. Moreover, while the suspension arm assembly <NUM> includes the ceiling attachment member <NUM> for connecting the suspension arm assembly <NUM> to a ceiling, it is contemplated that the ceiling attachment member <NUM> could be used to connect the suspension arm assembly <NUM> to any structure (fixed or movable) above a support surface, such as a floor.

The illustrated ceiling attachment member <NUM> accepts the cabling system <NUM> therein and supports the suspension arm assembly <NUM> from the ceiling of a room. The ceiling attachment member <NUM> includes a ceiling attachment flange <NUM> and a down tube <NUM>. The ceiling attachment flange <NUM> can have any configuration for connecting to a ceiling support structure. In the illustrated embodiment, the ceiling attachment flange <NUM> is a flat circular disc <NUM> having a plurality of holes <NUM> therein configured to receive fasteners (not shown) for fixedly connecting the flat circular disc <NUM> to the ceiling support structure. The flat circular disc <NUM> includes a central opening <NUM> receiving a first section <NUM> of the cabling system <NUM> therethrough. The down tube <NUM> includes a down cylinder <NUM> being co-axial with the central opening <NUM> in the flat circular disc <NUM> of the ceiling attachment flange <NUM>. The down tube <NUM> can have any axial length to adjust for various heights of ceilings in the room. The ceiling attachment member <NUM> further includes a central axis spindle <NUM> for connecting the down tube <NUM> to the extension arm <NUM>.

In the illustrated example, the central axis spindle <NUM> allows for infinite rotation of the extension arm <NUM> about the ceiling attachment member <NUM> and houses one of the infinite rotation fiber optic and slip ring joints <NUM> therein connecting the first section <NUM> of the cabling system <NUM> to a second section <NUM> of the cabling system <NUM>. The central axis spindle <NUM> includes an axis cylinder <NUM> having a pair of down tube mounting flanges <NUM> including an upper disc <NUM> and a lower disc <NUM>. The upper disc <NUM> surrounds a top edge of the axis cylinder <NUM> and the lower disc <NUM> surrounds a central area of the axis cylinder <NUM>. The upper disc <NUM> and the lower disc <NUM> have the same outer diameter corresponding to the inner diameter of the down cylinder <NUM> of the down tube <NUM> and have outer surfaces <NUM> which are aligned with one another such that the upper disc <NUM> and the lower disc <NUM> abut against an inner surface <NUM> of the down cylinder <NUM> of the down tube <NUM> (see <FIG>). Fasteners (not shown) extend through aligned openings <NUM> in the down cylinder <NUM> and into openings <NUM> in the outer alignment surfaces <NUM> of the upper disc <NUM> and the lower disc <NUM> to fixedly connect the down cylinder <NUM> to the central axis spindle <NUM>. As illustrated in <FIG>, the lower disc <NUM> closes a bottom open end <NUM> of the down cylinder <NUM>. An outer surface <NUM> of the axis cylinder <NUM> includes an upper bearing receiving area <NUM> located directly below the lower disc <NUM> and a lower bearing receiving area <NUM> located adjacent but spaced from a bottom edge <NUM> of the axis cylinder <NUM>. The axis cylinder <NUM> also includes a bearing receiving surface below the lower bearing receiving area <NUM>. The axis cylinder <NUM> receives the infinite rotation fiber optic and slip ring joint <NUM> therein and is received in a proximal end <NUM> of the extension arm <NUM>.

The illustrated extension arm <NUM> is connected to the ceiling attachment member <NUM> at the first infinite rotation joint <NUM>. The extension arm <NUM> includes a hollow tube <NUM> having the proximal end <NUM> connected to the ceiling attachment member <NUM> at the first infinite rotation joint <NUM> and a distal end <NUM> connected to the load counterbalancing spring arm <NUM> at the second infinite rotation joint <NUM>. As illustrated in <FIG>, the proximal end <NUM> of the extension arm <NUM> includes a spindle receiving block <NUM> receiving the central axis spindle <NUM> therein. The spindle receiving block <NUM> includes a side tube receiving counterbore <NUM> in a side face <NUM> thereof receiving an end of the hollow tube <NUM> therein for fixedly connecting the hollow tube <NUM> to the spindle receiving block <NUM>. The spindle receiving block <NUM> further includes a central spindle receiving circular hole <NUM> that extends through the spindle receiving block <NUM> from a top surface <NUM> to a bottom surface <NUM> thereof. An upper bearing ring receiving counter bore <NUM> in the top surface <NUM> of the spindle receiving block <NUM> surrounds the central spindle receiving circular hole <NUM> to form a top step surface <NUM> located below the top surface <NUM>. Likewise, a lower bearing ring receiving counter bore <NUM> in the bottom surface <NUM> of the spindle receiving block <NUM> surrounds the central spindle receiving circular hole <NUM> to form a bottom step surface <NUM> located above the bottom surface <NUM>. In the illustrated example, the spindle receiving block <NUM> has a circular cross-section. However, it is contemplated that the spindle receiving block <NUM> could have any exterior shape.

In the illustrated example, the central axis spindle <NUM> is inserted into the spindle receiving block <NUM> of the extension arm <NUM> to allow the extension arm <NUM> to rotate about the axis cylinder <NUM> of the central axis spindle <NUM>. During assembly of the suspension arm assembly <NUM>, one of the infinite rotation fiber optic and slip ring joints <NUM> is connected to the first section <NUM> of the cabling system <NUM> (as discussed in more detail below) and inserted into an interior <NUM> of the axis cylinder <NUM> through the bottom edge <NUM> of the axis cylinder <NUM>. A stator <NUM> of the infinite rotation fiber optic and slip ring joint <NUM> is then fixed to the axis cylinder <NUM> by fasteners (or any other connection method) such that the stator <NUM> of the infinite rotation fiber optic and slip ring joint <NUM> at the first infinite rotation joint <NUM> remains stationary relative to the room.

As illustrated in <FIG> and <FIG>, a first bearing ring <NUM> and a second bearing ring <NUM> allow the extension arm <NUM> to rotate relative to the ceiling attachment member <NUM> about a first vertical axis <NUM>. The first bearing ring <NUM> surrounds the axis cylinder <NUM> at the upper bearing receiving area <NUM>, with the lower disc <NUM> of the central axis spindle <NUM> resting on the first bearing ring <NUM>. The first bearing ring <NUM> is located within the upper bearing ring receiving counter bore <NUM> in the top surface <NUM> of the spindle receiving block <NUM> and rides on the top step surface <NUM>. The second bearing ring <NUM> surrounds the axis cylinder <NUM> at the lower bearing receiving area <NUM>. The second bearing ring <NUM> is located within the lower bearing ring receiving counter bore <NUM> in the bottom surface <NUM> of the spindle receiving block <NUM>, with the bottom step <NUM> resting on the second bearing ring <NUM>. A disc shaped spanner nut <NUM> is connected to an end of the axis cylinder <NUM> (e.g., by being threaded onto the axis cylinder <NUM>) to hold the second bearing ring <NUM> on the end of the axis cylinder <NUM>. The disc shaped spanner nut <NUM> also compresses the second bearing ring <NUM> between the bottom step <NUM> of the lower bearing ring receiving counter bore <NUM> and the disc shaped spanner nut <NUM> such that the second bearing ring <NUM> rides on the disc shaped spanner nut <NUM>. The disc shaped spanner nut <NUM> thereby ensures that the extension arm <NUM> is securely connected to the ceiling attachment member <NUM> to allow the extension arm <NUM> to rotate about the ceiling attachment member <NUM> in a stable manner.

In the illustrated example, a rotor <NUM> of the infinite rotation fiber optic and slip ring joint <NUM> is allowed to rotate relative to the stator <NUM> of the infinite rotation fiber optic and slip ring joint <NUM> and is connected to the second section <NUM> of the cabling system <NUM>. Therefore, the rotor <NUM> of the infinite rotation fiber optic and slip ring joint <NUM> at the first infinite rotation joint <NUM> and the second section <NUM> of the cabling system <NUM> are able to rotate with rotation of the extension arm <NUM> about the ceiling attachment member <NUM>. As illustrated in <FIG>, the second section <NUM> of the cabling system <NUM> enters the hollow tube <NUM> of the extension arm <NUM> through a cabling entrance <NUM> in the hollow tube <NUM> adjacent the spindle receiving block <NUM> at the proximal end <NUM> of the extension arm <NUM>. A cosmetic and protective cover <NUM> covers a bottom of the proximal end <NUM> of the extension arm <NUM>, with the cosmetic and protective cover <NUM> being connected to a bottom of the hollow tube <NUM> in order to cover the cabling entrance <NUM> and also being connected to a bottom of the spindle receiving block <NUM> to protect a bottom of the spindle receiving block <NUM>, the infinite rotation fiber optic and slip ring joint <NUM> at the first infinite rotation joint <NUM>, the disc shaped spanner nut <NUM>, and the central axis spindle <NUM>. The cosmetic and protective cover <NUM> protects the second section <NUM> of the cabling system <NUM> connected to the infinite rotation fiber optic and slip ring joint <NUM> at the first infinite rotation joint <NUM> and hides the second section <NUM> of the cabling system <NUM> from exposure.

The illustrated second section <NUM> of the cabling system <NUM> extends through the extension arm <NUM> and is connected to a second one of the infinite rotation fiber optic and slip ring joints <NUM> at the second infinite rotation joint <NUM>. The second infinite rotation joint <NUM> includes an intersection of the extension arm <NUM> at the distal end <NUM> thereof and a proximal end <NUM> of the load counterbalancing spring arm <NUM>. The illustrated extension arm <NUM> includes a circular pivot tube receiving block <NUM> at the distal end <NUM> thereof, with the circular pivot tube receiving block <NUM> being connected to the hollow tube <NUM> of the extension arm <NUM>. The circular pivot tube receiving block <NUM> includes a side tube receiving bore <NUM> receiving the hollow tube <NUM> therein for fixing the hollow tube <NUM> to the circular pivot tube receiving block <NUM>. As illustrated in <FIG>, the circular pivot tube receiving block <NUM> includes a stepped vertically oriented circular bearing tube receiving hole <NUM> extending therethrough. The stepped vertically oriented circular bearing tube receiving hole <NUM> includes a smaller diameter lower portion <NUM>, a larger diameter upper portion <NUM> and a step <NUM> between the smaller diameter lower portion <NUM> and the larger diameter upper portion <NUM>. A tubular sleeve <NUM> is located in the smaller diameter lower portion <NUM> and a top surface <NUM> of the tubular sleeve <NUM> abuts the step <NUM>. As illustrated in <FIG>, the hollow tube <NUM> is inserted into the side tube receiving bore <NUM> until the hollow tube <NUM> abuts the exterior surface of the tubular sleeve <NUM>.

In the illustrated example, the tubular sleeve <NUM> is configured to receive a bearing tube <NUM> of the load counterbalancing spring arm <NUM> therein for connecting the load counterbalancing spring arm <NUM> to the extension arm <NUM>. An interior surface of the tubular sleeve <NUM> defines a circular inner bearing surface <NUM> within the circular pivot tube receiving block <NUM>. As illustrated in <FIG>, an access area <NUM> is located in the circular pivot tube receiving block <NUM> above the tubular sleeve <NUM> for allowing the second section <NUM> of the cabling system <NUM> to pass from the hollow tube <NUM> and into the circular pivot tube receiving block <NUM>. It is contemplated that the circular pivot tube receiving block <NUM> could have an open top <NUM> covered by a removable cover <NUM>. The tubular sleeve <NUM> has an open bottom area <NUM> for receiving the bearing tube <NUM> of the load counterbalancing spring arm <NUM> therein.

The illustrated load counterbalancing spring arm <NUM> is configured to rotate about a second vertical axis <NUM> at the second infinite rotation joint <NUM> and a third vertical axis <NUM> at the third infinite rotation joint <NUM> (see <FIG>). The load counterbalancing spring arm <NUM> is also configured to allow the third infinite rotation joint <NUM> to move vertically relative to the second infinite rotation joint <NUM>. The load counterbalancing spring arm <NUM> includes a proximal knuckle member <NUM>, a central member <NUM> and a distal knuckle member <NUM>. The proximal knuckle member <NUM> has the bearing tube <NUM> extending therefrom for connecting the proximal knuckle member <NUM>, and thereby the load counterbalancing spring arm <NUM>, to the extension arm <NUM>. The proximal knuckle member <NUM> also includes the second vertical axis <NUM> extending therethrough. The proximal knuckle member <NUM> is pivotally connected to the central member <NUM> to allow the central member <NUM> to pivot about a first horizontal axis <NUM>. The central member <NUM> is also pivotally connected to the distal knuckle member <NUM> to allow the central member <NUM> to pivot about a second horizontal axis <NUM>. The distal knuckle member <NUM> also includes the third vertical axis <NUM> extending therethrough. The distal knuckle member <NUM> is connected to the wired medical unit <NUM> as discussed in more detail below.

In the illustrated example, the proximal knuckle member <NUM> has the bearing tube <NUM> extending therefrom for connecting the proximal knuckle member <NUM> to the extension arm <NUM>. The proximal knuckle member <NUM> includes a U-shaped side wall <NUM>, a bottom wall <NUM> and a top wall <NUM>, with the bearing tube <NUM> extending through an opening <NUM> in the top wall <NUM>. The U-shaped side wall <NUM> includes a curved wall section <NUM> below the circular pivot tube receiving block <NUM> and a pair of stepped side wall sections <NUM> extending from the curved wall section <NUM> to define an open end opposite the curved wall section <NUM>. Each of the stepped side wall sections <NUM> include a circular recessed area at a terminal end thereof for accepting disc projections <NUM> of the central member <NUM> as discussed in more detail below. The top wall <NUM> includes a substantially flat portion <NUM> connected to a top of the U-shaped side wall <NUM> and an arcuate portion <NUM> connected to the top of the circular recessed areas of the U-shaped side wall <NUM>. The bottom wall <NUM> includes a curved section <NUM> connected to a bottom of the U-shaped side wall <NUM> and an arcuate portion <NUM> connected to the bottom of the circular recessed areas of the U-shaped side wall <NUM>. As illustrated in <FIG>, the bearing tube <NUM> extends upwardly out of the opening <NUM> in the flat portion <NUM> of the top wall <NUM> and directly into the tubular sleeve <NUM> of the circular pivot tube receiving block <NUM>. A fixing projection <NUM> extends from an inside face <NUM> of the U-shaped side wall <NUM> to connect the bearing tube <NUM> to the proximal knuckle member <NUM>.

The illustrated bearing tube <NUM> of the load counterbalancing spring arm <NUM> is inserted into the open bottom area <NUM> of the tubular sleeve <NUM> of the circular pivot tube receiving block <NUM> of the extension arm <NUM> to connect the load counterbalancing spring arm <NUM> to the extension arm <NUM>. The bearing tube <NUM> includes a bearing cylinder <NUM>, an upper bearing ring <NUM> connected to an upper area <NUM> of the bearing cylinder <NUM> and a middle bearing ring <NUM> connected to a middle area <NUM> of the bearing cylinder <NUM> directly above the top wall <NUM> of the proximal knuckle member <NUM>. The tubular sleeve <NUM> includes an upper circular recess <NUM> receiving the upper bearing ring <NUM> therein and a lower circular recess <NUM> receiving the middle bearing ring <NUM> therein for allowing the bearing tube <NUM>, and thereby the load counterbalancing spring arm <NUM>, to rotate relative to the extension arm <NUM>. The wired medical unit <NUM> is thereby allowed to rotate about the second vertical axis <NUM> at the second infinite rotation joint <NUM>.

In the illustrated example, one of the infinite rotation fiber optic and slip ring joints <NUM> at the second infinite rotation joint <NUM> is connected to the second section <NUM> of the cabling system <NUM> and a third section <NUM> of the cabling system <NUM> extending through the load counterbalancing spring arm <NUM> as discussed in more detail below. The stator <NUM> of the infinite rotation fiber optic and slip ring joint <NUM> at the second infinite rotation joint <NUM> is fixed to the bearing tube <NUM> by fasteners (or any other connection method) such that the stator <NUM> of the infinite rotation fiber optic and slip ring joint <NUM> at the second infinite rotation joint <NUM> is stationary relative to the load counterbalancing spring arm <NUM>. Likewise, the rotor <NUM> of the infinite rotation fiber optic and slip ring joint <NUM> at the second infinite rotation joint <NUM> is allowed to rotate relative to the stator <NUM>.

As illustrated in <FIG>, <FIG> and <FIG>, the third section <NUM> of the cabling system <NUM> extends through the central member <NUM> of the load counterbalancing spring arm <NUM> and is connected to a third one of the infinite rotation fiber optic and slip ring joints <NUM> at the third infinite rotation joint <NUM>. The third infinite rotation joint <NUM> includes an intersection of the load counterbalancing spring arm <NUM> at the distal end <NUM> thereof and the wired medical unit <NUM>. The central member <NUM> of the load counterbalancing spring arm <NUM> is pivotally connected to the proximal knuckle member <NUM> at the first horizontal axis <NUM> to allow the wired medical unit <NUM> to rotate about the first horizontal axis <NUM>. The central member <NUM> is also pivotally connected to the distal knuckle member <NUM> at the second horizontal axis <NUM> to allow the wired medical unit <NUM> to rotate about the second horizontal axis <NUM>.

The illustrated load counterbalancing spring arm <NUM> is configured to have the central member <NUM> rotate simultaneously about the proximal knuckle member <NUM> and the distal knuckle member <NUM>. The central member <NUM> includes an outer shell <NUM> having a substantially rectangular cross-sectional shape. A parallel pair of the disc projections <NUM> extends from each end of the outer shell <NUM>. A parallelogram connection assembly <NUM> extends through the outer shell <NUM> and is connected to both the proximal knuckle member <NUM> and the distal knuckle member <NUM> to allow the central member <NUM> to rotate simultaneously about the proximal knuckle member <NUM> and the distal knuckle member <NUM>.

In the illustrated example, the distal knuckle member <NUM> connects the load counterbalancing spring arm <NUM> to the wired medical unit <NUM>. The distal knuckle member <NUM> includes a U-shaped side wall <NUM>, a bottom wall <NUM> and a top wall <NUM>, with a down tube <NUM> extending downwardly from the bottom wall <NUM> for connection to the display support assembly <NUM> of the wired medical unit <NUM>. The U-shaped side wall <NUM> includes a curved wall section <NUM> coextensive with the down tube <NUM> and a pair of stepped side wall sections <NUM> extending from the curved wall section <NUM> to define an open end opposite the curved wall section <NUM>. Each of the stepped side wall sections <NUM> include a circular recessed area at a terminal end thereof for accepting disc projections <NUM> of the central member <NUM> as discussed in more detail below. The top wall <NUM> includes an angled portion <NUM> connected to a top of the U-shaped side wall <NUM> and an arcuate portion <NUM> connected to the top of the circular recessed areas of the U-shaped side wall <NUM>. The bottom wall <NUM> is arcuate and is connected to a bottom of the U-shaped side wall <NUM>.

The illustrated parallelogram connection assembly <NUM> extends between and is connected to the proximal knuckle member <NUM> and the distal knuckle member <NUM>. The parallelogram connection assembly <NUM> includes an upper rod <NUM>, a lower rod <NUM>, a proximal knuckle connection <NUM> and a distal knuckle connection <NUM>. The proximal knuckle connection <NUM> includes a pair of parallel plates <NUM> extending between the arcuate portion <NUM> of the top wall <NUM> and the arcuate portion <NUM> of the bottom wall <NUM> of the proximal knuckle member <NUM>. The upper rod <NUM> is located between the parallel plates <NUM> and pivotally connected thereto by a pivot pin <NUM> located at the first horizontal axis <NUM> to allow the upper rod <NUM> to pivot about the first horizontal axis <NUM>. The lower rod <NUM> is pivotally connected to an outside face <NUM> of one of the parallel plates <NUM> by a pivot pin <NUM>. Like the proximal knuckle connection <NUM>, the distal knuckle connection <NUM> includes a pair of parallel plates <NUM> extending between the arcuate portion <NUM> of the top wall <NUM> and the bottom wall <NUM> of the distal knuckle member <NUM>. The upper rod <NUM> is located between the parallel plates <NUM> and pivotally connected thereto by a pivot pin <NUM> located at the second horizontal axis <NUM> to allow the upper rod <NUM> to pivot about the second horizontal axis <NUM>. The lower rod <NUM> is pivotally connected to an outside face <NUM> of one of the parallel plates <NUM> by a pivot pin <NUM>.

In the illustrated example, the parallelogram connection assembly <NUM> allows the second horizontal axis <NUM> to move vertically relative to the first horizontal axis <NUM>. As the distal knuckle member <NUM> is lowered, the upper rod <NUM> will pivot about the pivot pin <NUM> located at the first horizontal axis <NUM>, which will also force the lower rod <NUM> to pivot about the pivot pin <NUM> at the proximal knuckle member <NUM>. Because the upper rod <NUM> and the lower rod <NUM> of the parallelogram connection assembly <NUM> form a parallelogram with the parallel plates <NUM> in the proximal knuckle member <NUM> and the parallel plates <NUM> in the distal knuckle member <NUM>, the distal knuckle member <NUM> will not rotate as the distal knuckle member <NUM> is lowered (that is, a line between the pivot pin <NUM> and the pivot pin <NUM> in the proximal knuckle member <NUM> will remain substantially parallel to a line between the pivot pin <NUM> and the pivot pin <NUM> in the distal knuckle member <NUM>, with both lines remaining substantially vertical). As is well known to those skilled in the art, a spring can be located within the central member <NUM> (e.g., partially surrounding the upper rod <NUM>) to maintain the parallelogram connection assembly <NUM> in a selected rotated position.

The illustrated central member <NUM> covers the pivot areas of the load counterbalancing spring arm <NUM>. The outer shell <NUM> of the central member <NUM> includes a top wall <NUM> that rides on the arcuate portion <NUM> of the top wall <NUM> of the proximal knuckle member <NUM> and the arcuate portion <NUM> of the top wall <NUM> and the bottom wall <NUM> of the distal knuckle member <NUM> during lowering and raising of the load counterbalancing spring arm <NUM>. Likewise, the outer shell <NUM> of the central member <NUM> includes a bottom wall <NUM> that rides on the arcuate portion <NUM> of the bottom wall <NUM> of the proximal knuckle member <NUM> and the bottom wall <NUM> of the distal knuckle member <NUM> during lowering and raising of the load counterbalancing spring arm <NUM>. Each end of the side walls <NUM> of the outer shell <NUM> of the central member <NUM> have one of the disc projections <NUM> extending therefrom. The disc projections <NUM> cover the circular recessed area at the terminal ends of the stepped side wall sections <NUM> of the U-shaped side wall <NUM> of the proximal knuckle member <NUM> to form a cosmetic joint. The disc projections <NUM> also cover the circular recessed area of the pair of stepped side wall sections <NUM> of the U-shaped side wall <NUM> of the distal knuckle member <NUM> to form a cosmetic joint.

In the illustrated example, the distal knuckle member <NUM> connects the load counterbalancing spring arm <NUM> to the wired medical unit <NUM>. The down tube <NUM> of the distal knuckle member <NUM> receives a bushing cylinder <NUM> of the display support assembly <NUM> therein to connect the distal knuckle member <NUM>, and thereby the load counterbalancing spring arm <NUM>, to the display support assembly <NUM>. The display support assembly <NUM> includes an inverted U-shaped frame member <NUM>, an arm connection assembly <NUM> connected to a top of the inverted U-shaped frame member <NUM> and a pair of display pivot brackets <NUM>. The arm connection assembly <NUM> includes a split sleeve <NUM> that surrounds the top of the inverted U-shaped frame member <NUM>, with the bushing cylinder <NUM> extending upwardly from a center of the split sleeve <NUM>. The bushing cylinder <NUM> includes an upper cylindrical bushing <NUM> located in an upper bushing channel <NUM> in an outside surface <NUM> of the bushing cylinder <NUM> and a lower cylindrical bushing <NUM> located in a lower bushing channel <NUM> in the outside surface <NUM> of the bushing cylinder <NUM>. A pin slot <NUM> extends around the perimeter of the bushing cylinder <NUM> between the upper bushing channel <NUM> and the lower bushing channel <NUM>.

The illustrated wired medical unit <NUM> is connected to the distal knuckle member <NUM> of the load counterbalancing spring arm <NUM> by inserting the bushing cylinder <NUM> of the display support assembly <NUM> into the down tube <NUM> of the distal knuckle member <NUM>. As illustrated in <FIG>, the down tube <NUM> of the distal knuckle member <NUM> has a radial pin opening <NUM> extending through a wall <NUM> of the down tube <NUM>. When the bushing cylinder <NUM> of the display support assembly <NUM> is fully inserted into the down tube <NUM> of the distal knuckle member <NUM>, the radial pin opening <NUM> in the wall <NUM> of the down tube <NUM> is aligned with the pin slot <NUM> in the bushing cylinder <NUM>. A yoke retaining clip <NUM> extends through the radial pin opening <NUM> and into the pin slot <NUM> in the bushing cylinder <NUM> to connect the wired medical unit <NUM> to the distal knuckle member <NUM>. The yoke retaining clip <NUM> also allows the wired medical unit <NUM> to rotate about the distal knuckle member <NUM> at the third vertical axis <NUM>. Once the yoke retaining clip <NUM> is inserted into the radial pin opening <NUM> and the pin slot <NUM>, a cylindrical retaining clip sleeve <NUM> surrounding the down tube <NUM> is slid downward to cover the radial pin opening <NUM> in the wall <NUM> of the down tube <NUM> to lock the yoke retaining clip <NUM> in position. A fastener <NUM> can be inserted through the cylindrical retaining clip sleeve <NUM> and into the down tube <NUM> to lock the cylindrical retaining clip sleeve <NUM> in position.

In the illustrated example, one of the infinite rotation fiber optic and slip ring joints <NUM> at the third infinite rotation joint <NUM> is connected to the third section <NUM> of the cabling system <NUM> and a fourth section <NUM> of the cabling system <NUM> extending to the display monitor <NUM>. The stator <NUM> of the infinite rotation fiber optic and slip ring joint <NUM> at the third infinite rotation joint <NUM> is fixed to the down tube <NUM> of the distal knuckle member <NUM> by fasteners (or any other connection method) such that the stator <NUM> of the infinite rotation fiber optic and slip ring joint <NUM> at the third infinite rotation joint <NUM> is stationary relative to the load counterbalancing spring arm <NUM>. Likewise, the rotor <NUM> of the infinite rotation fiber optic and slip ring joint <NUM> at the third infinite rotation joint <NUM> is allowed to rotate relative to the stator <NUM>.

The illustrated fourth section <NUM> of the cabling system <NUM> extends through the down tube <NUM> of the distal knuckle member <NUM> of the load counterbalancing spring arm <NUM>, the bushing cylinder <NUM> of the arm connection assembly <NUM>, the inverted U-shaped frame member <NUM>, and to the display pivot brackets <NUM>. As illustrated in <FIG>, the display pivot brackets <NUM> are connected to a display frame and cable shield <NUM> holding the display monitor <NUM> and allow the display monitor <NUM> to pivot about the display pivot brackets <NUM>. The display frame and cable shield <NUM> can have a handle <NUM> to assist in positioning the display monitor <NUM> to a desired position. It is contemplated that the handle <NUM> can be removable for sterilization and/or can have a removable/replaceable sterilizable cover.

The illustrated cabling system <NUM> provides power and information to the wired medical unit <NUM> through the display support assembly <NUM>. It is contemplated that each of the infinite rotation fiber optic and slip ring joints <NUM> can transmit any combination of the following: digital data through a fiber optic connection, digital or analog data through at least one coaxial cable connection, digital or analog data through at least one serial data connection, low voltage power through at least one low voltage power connection, AC power through at least one AC power connection, and a ground wire connection.

<FIG> illustrates the power and information transmitted through the cabling system <NUM> and each of the infinite rotation fiber optic and slip ring joints <NUM> of the illustrated embodiment. The illustrated cabling system <NUM> includes a fiber optic cable <NUM> leading into and out of each infinite rotation fiber optic and slip ring joint <NUM>, a pair of ground wires <NUM> leading into and out of each infinite rotation fiber optic and slip ring joint <NUM>, a pair of AC power wires <NUM> leading into and out of each infinite rotation fiber optic and slip ring joint <NUM>, four low voltage wires <NUM> leading into and out of each infinite rotation fiber optic and slip ring joint <NUM>, four twisted pairs of serial data wires <NUM> leading into and out of each infinite rotation fiber optic and slip ring joint <NUM> and four coaxial cables <NUM> leading into and out of each infinite rotation fiber optic and slip ring joint <NUM>. However, it is contemplated that the cabling system <NUM> could have more or less of the wires and cables outlined above.

The following chart lists examples of the cables and wires leading into and out of each infinite rotation fiber optic and slip ring joint <NUM>:.

It is contemplated that the fiber optic cable <NUM> can be single mode or multimode and can have at least <NUM> Gb of bandwidth. The coaxial cables <NUM> can have an impedance of 75Ω and can be a co-axial cable sold as part number MOGAMI W3351 by MIT Inc. of Tokyo, Japan. The AC power wires <NUM> can be a power line sold as part number <NUM>/<NUM> by Weico Wire & Cable Inc. of Edgewood, New York.

In the illustrated example, the infinite rotation fiber optic and slip ring joints <NUM> (<FIG>) transmit all of the data and power through the first infinite rotation joint <NUM>, the second infinite rotation joint <NUM> and the third infinite rotation joint <NUM>. The infinite rotation fiber optic and slip ring joint <NUM> includes a slip ring housing <NUM> and a fiber optic rotary joint <NUM> within the slip ring housing <NUM>. The slip ring housing <NUM> includes the rotor <NUM> and the stator <NUM>. The stator <NUM> includes an exterior stator cylinder <NUM> having a rotor end wall <NUM> and an exit end wall <NUM>. An internal stator cylinder <NUM> substantially co-axial with the exterior stator cylinder <NUM> is connected to the exit end wall <NUM>. A wiring area <NUM> is defined between the exterior stator cylinder <NUM> and the internal stator cylinder <NUM>. A stator and fiber optic rotary joint area <NUM> is defined within the internal stator cylinder <NUM>.

The illustrated rotor <NUM> includes an exterior cylindrical portion <NUM> extending from the rotor end wall <NUM> of the stator <NUM> and an interior portion <NUM> located within the stator and fiber optic rotary joint area <NUM> of the stator <NUM>. The exterior cylindrical portion <NUM> defines a tubular housing <NUM> having an entrance end <NUM> opposite the stator <NUM>. The fiber optic cable <NUM> enters the entrance end <NUM> of the exterior cylindrical portion <NUM> of the rotor <NUM> through a center portion thereof. It is contemplated that the fiber optic cable <NUM> outside of the rotor <NUM> can have a connector <NUM> (e.g., a SC, LC, FC, ST, SMA or pigtail type connector) for connecting the fiber optic cable <NUM> passing through the infinite rotation fiber optic and slip ring joint <NUM> to the fiber optic cable <NUM> of the first section <NUM>, the second section <NUM>, the third section <NUM> or the fourth section <NUM> of the cabling system <NUM>. It is also contemplated that the fiber optic cable <NUM> can run uninterrupted up to and between the infinite rotation fiber optic and slip ring joints <NUM>. The ground wires <NUM>, the AC power wires <NUM>, the low voltage wires <NUM>, the twisted pairs of serial data wires <NUM> and the coaxial cables <NUM> enter the entrance end <NUM> of the exterior cylindrical portion <NUM> of the rotor <NUM> adjacent a peripheral edge <NUM> of the entrance end <NUM>.

The illustrated ground wires <NUM>, the AC power wires <NUM>, the low voltage wires <NUM>, the twisted pairs of serial data wires <NUM> and the coaxial cables <NUM> entering the exterior cylindrical portion <NUM> of the rotor <NUM> are connected to a center rotating shaft <NUM> made up of a plurality of individual contact rings <NUM> and forming the interior portion <NUM> of the rotor <NUM>. Each of the ground wires <NUM>, the AC power wires <NUM>, the low voltage wires <NUM>, the serial data wires <NUM> and the coaxial cables <NUM> are connected to one of the individual contact rings <NUM> of the center rotating shaft <NUM>. As illustrated in <FIG>, each of the individual contact rings <NUM> are separate by an insulation ring <NUM> to prevent power or data from crossing over to adjacent individual contact rings <NUM>. Each of the individual contact rings <NUM> include a plurality of circumferential grooves <NUM> for receiving contact members <NUM> of the stator <NUM> as discussed in more detail below. It is contemplated that the individual contact rings <NUM> transferring power can be located closer to the exterior cylindrical portion <NUM> of the rotor <NUM>, can have larger diameters and can have adjacent insulation rings <NUM> with a greater thickness (see <FIG>) than the individual contact rings <NUM> transferring data (see <FIG>). The center rotating shaft <NUM> includes a plurality of terminal end openings <NUM> for accepting fasteners <NUM> therein to connect a rotor portion <NUM> of the fiber optic rotary joint <NUM> to the center rotating shaft <NUM>. The center rotating shaft <NUM> also includes a circumferential groove <NUM> at an end thereof opposite the exterior cylindrical portion <NUM> of the rotor <NUM>. A bearing ring <NUM> is located within the circumferential groove <NUM> to support the center rotating shaft <NUM> and to allow the center rotating shaft <NUM> to rotate within the stator <NUM>.

The illustrated stator <NUM> includes a portion of the rotor <NUM> therein to receive data and power from the rotor <NUM>. The stator <NUM> includes the exterior stator cylinder <NUM> having the rotor end wall <NUM> and the exit end wall <NUM>, with the internal stator cylinder <NUM> extending substantially co-axial with the exterior stator cylinder <NUM> from the exit end wall <NUM>. The internal stator cylinder <NUM> includes an enlarged abutment area <NUM> abutting the bearing ring <NUM> located within the circumferential groove <NUM> of the center rotating shaft <NUM> of the rotor <NUM> to allow the center rotating shaft <NUM> and the rotor <NUM> to rotate relative to the stator <NUM>. The contact members <NUM> extend through the internal stator cylinder <NUM> (see <FIG>) and make contact with the plurality of circumferential grooves <NUM> in the individual contact rings <NUM> of the internal stator cylinder <NUM>. The contact members <NUM> on the outside surface of the internal stator cylinder <NUM> are engaged with the ground wires <NUM>, the AC power wires <NUM>, the low voltage wires <NUM>, the twisted pairs of serial data wires <NUM> and the coaxial cables <NUM> exiting the stator <NUM>. As illustrated in <FIG> and <FIG>, the ground wires <NUM>, the AC power wires <NUM>, the low voltage wires <NUM>, the twisted pairs of serial data wires <NUM> and the coaxial cables <NUM> exit the exit end wall <NUM> through openings <NUM> located adjacent the periphery of the exit end wall <NUM> in wiring groups <NUM>.

The power and data is transferred from the ground wires <NUM>, the AC power wires <NUM>, the low voltage wires <NUM>, the twisted pairs of serial data wires <NUM> and the coaxial cables <NUM> entering the infinite rotation fiber optic and slip ring joint <NUM> to the ground wires <NUM>, the AC power wires <NUM>, the low voltage wires <NUM>, the twisted pairs of serial data wires <NUM> and the coaxial cables <NUM> exiting the infinite rotation fiber optic and slip ring joint <NUM>. As discussed above, the power and data is first transferred from the ground wires <NUM>, the AC power wires <NUM>, the low voltage wires <NUM>, the twisted pairs of serial data wires <NUM> and the coaxial cables <NUM> entering the infinite rotation fiber optic and slip ring joints <NUM> to the individual contact rings <NUM> of the center rotating shaft <NUM>. The contact members <NUM> extending through the internal stator cylinder <NUM> of the stator <NUM> make contact with the plurality of circumferential grooves <NUM> in the individual contact rings <NUM> of the internal stator cylinder <NUM> to transfer the power and data. It is contemplated that the contact members <NUM> can be brushes (e.g., graphite particles dispersed in a matrix of silver with the individual contact rings <NUM> also being made of silver, gold alloys forming a mono or multi-filament brush with the individual contact rings <NUM> also be made of a gold based alloy, etc.), a flexure ring that bridges the outer ring and the inner ring and that moves like balls in a ball bearing, or liquid mercury. The power and data is thereafter transferred through the contacts to the ground wires <NUM>, the AC power wires <NUM>, the low voltage wires <NUM>, the twisted pairs of serial data wires <NUM> and the coaxial cables <NUM> entering the infinite rotation fiber optic and slip ring joint <NUM> to the ground wires <NUM>, the AC power wires <NUM>, the low voltage wires <NUM>, the twisted pairs of serial data wires <NUM> and the coaxial cables <NUM> exiting the infinite rotation fiber optic and slip ring joint <NUM>. While power and data is discussed above and travelling only in one direction from the rotor <NUM> to the stator <NUM>, the power and data can travel in both directions through the infinite rotation fiber optic and slip ring joint <NUM>. Moreover, the infinite rotation fiber optic and slip ring joint <NUM> is capable of being orientated in any direction (e.g., either the stator <NUM> or the rotor <NUM> being located first in the direction of data and power in the cabling system <NUM> to the wired medical unit <NUM>). The fiber optic cable <NUM> exits the exit end wall <NUM> of the stator <NUM> through a center portion thereof. It is contemplated that the fiber optic cable <NUM> outside of the stator <NUM> can have the connector <NUM> (e.g., a SC, LC, FC, ST, SMA or pigtail type connector) for connecting the fiber optic cable <NUM> passing through the infinite rotation fiber optic and slip ring joint <NUM> to the fiber optic cable <NUM> of the first section <NUM>, the second section <NUM>, the third section <NUM> or the fourth section <NUM> of the cabling system <NUM>. It is also contemplated that the fiber optic cable <NUM> can run uninterrupted up to and between the infinite rotation fiber optic and slip ring joints <NUM>.

In the illustrated example, data also passes through the infinite rotation fiber optic and slip ring joint <NUM> through the fiber optic rotary joint <NUM> within the slip ring housing <NUM>.

The fiber optic rotary joint <NUM> includes the rotor portion <NUM> and a stator portion <NUM>. The rotor portion <NUM> includes increasing larger diameter areas having an entrance end <NUM> and a stator connection end <NUM>. A largest diameter area <NUM> of the rotor portion <NUM> includes the fasteners <NUM> extending therethrough and into the terminal end openings <NUM> of the center rotating shaft <NUM> of the rotor <NUM> to force the rotor portion <NUM> of the fiber optic rotary joint <NUM> to rotate with the remainder of the rotor <NUM>. The stator portion <NUM> of the fiber optic rotary joint <NUM> is rotatably connected to the rotor portion <NUM>. The stator portion <NUM> of the fiber optic rotary joint <NUM> includes a head <NUM> connected to the exit end wall <NUM> of the exterior stator cylinder <NUM> of the stator <NUM> such that the stator portion <NUM> of the fiber optic rotary joint <NUM> remains stationary with the remainder of the stator <NUM>.

The illustrated fiber optic cable <NUM> enters the rotor <NUM> through the entrance end <NUM> of the tubular housing <NUM> of the exterior cylindrical portion <NUM> of the rotor <NUM> and exits the stator <NUM> through the head <NUM> of the stator portion <NUM> of the fiber optic rotary joint <NUM>. The fiber optic cable <NUM> is split within the fiber optic rotary joint <NUM> such that a first portion <NUM> of the fiber optic cable <NUM> within the fiber optic rotary joint <NUM> rotates with the rotor portion <NUM> of the fiber optic rotary joint <NUM> and a second portion <NUM> of the fiber optic cable <NUM> within the fiber optic rotary joint <NUM> remains stationary with the stator portion <NUM> of the fiber optic rotary joint <NUM>. The data is transferred from the first portion <NUM> of the fiber optic cable <NUM> to the second portion <NUM> of the fiber optic cable <NUM> in a manner well known to those skilled in the art. The fiber optic rotary joint <NUM> can be the fiber optic rotary joint disclosed in <CIT> entitled "FIBER OPTIC ROTARY COUPLER," The fiber optic rotary joint <NUM> can also be a fiber rotary joint sold as part number MJXX-<NUM>-50T-STD or MJXX-<NUM>-50T-STP by Princetel, Inc. of Hamilton, New Jersey. The fiber optic rotary joint <NUM> can be made of any suitable material (e.g., stainless steel).

In the illustrated embodiment, the data passing through the fiber optic cable <NUM> can be subjected to an optical multiplexer <NUM> before the data passes through the fiber optic rotary joint <NUM> and then passed through an optical demultiplexer <NUM> before passing the data to the wired medical unit <NUM>. For example, as illustrated in <FIG>, a plurality of video signals <NUM> can be passed through an electric to optical transceiver <NUM>, with each of the video signals <NUM> having different wavelengths, before the video signals <NUM> are passed to the optical multiplexer <NUM>. Furthermore, an audio signal <NUM> can be passed through an electric to optical transceiver <NUM> before the audio signal <NUM> is passed to the optical multiplexer <NUM>. Moreover, a plurality of control signals <NUM> can be passed through an electric to optical transceiver <NUM>, with each of the control signals <NUM> having different wavelengths, before the control signals <NUM> are passed to the optical multiplexer <NUM>. Likewise, a plurality of network signals <NUM> can be passed through an electric to optical transceiver <NUM>, with each of the network signals <NUM> having different wavelengths, before the network signals are passed to the optical multiplexer <NUM>. Each of the video signals <NUM>, the audio signal <NUM>, the control signals <NUM> and the network signals <NUM> are at different wavelengths before the signals are passed to the optical multiplexer <NUM>, where the signals are combined. The optical demultiplexer <NUM> separates the signals and optical to electrical transceivers <NUM> will transform the video signals <NUM>, the audio signal <NUM>, the control signals <NUM> and the network signals <NUM> from optical signals to electrical signals. The optical multiplexer <NUM> and the optical demultiplexer <NUM> allow for multiple signals to be passed through the fiber optic cable <NUM> and the fiber optic rotary joints <NUM>. Use of the optical multiplexer <NUM> and the optical demultiplexer <NUM> for passing multiple signals through cables is well known to those skilled in the art. Using the optical multiplexer <NUM> and the optical demultiplexer <NUM>, multiple data can be sent through a single wire. For example, an HDMI signal with <NUM> resolution along with a bidirectional Ethernet signal through the fiber optic cable <NUM>. Although the optical multiplexer <NUM> is referred to as a multiplexer and the optical demultiplexer <NUM> is referred to as a demultiplexer, both the optical multiplexer <NUM> and the optical demultiplexer <NUM> are both multiplexers and demultiplexers because the data flows in both directions (i.e., is bidirectional). It is contemplated that circulators could be used in concert with the optical multiplexer <NUM> and the optical demultiplexer <NUM> to double the capacity of the fiber optic cable <NUM>.

The suspension arm assembly <NUM> is illustrated as having the arms <NUM> in a single line having a single end point such that only two arms <NUM> meet at the infinite rotation joints. However, it is contemplated that three or more arms <NUM> could meet at a single joint. In such an arrangement, at least one of the ground wires <NUM>, the AC power wires <NUM>, the low voltage wires <NUM>, the twisted pairs of serial data wires <NUM>, the coaxial cables <NUM> and the fiber optic cable <NUM> could continue along each branch of the arms <NUM> at the infinite rotation joints. Furthermore, it is contemplated that the wires and/or cables could be split at the infinite rotation joints such that the power and data is sent along each branch of arms <NUM> to the wire medical units <NUM> at the end of each branch. <FIG> illustrates a situation wherein the data from the optical multiplexer <NUM> is split off into a branch line <NUM> at an infinite rotation joint and sent to a second optical demultiplexer <NUM> before being sent to an optical to electrical transceivers <NUM> and ultimately to a second wired medical unit <NUM>.

Multiple data and power signals can be sent along the arms <NUM> of the suspension arm assembly <NUM> having multiple infinite rotation joints with unlimited range (i.e., unlimited range of rotation and number of rotations). Therefore, the suspension arm assembly <NUM> allows for a large data transfer rate while simultaneously allowing the suspension arm assembly <NUM> to be fully and easily adjustable to any desired location. The arms <NUM> can be made of any material (e.g., plastic and/or metal) and can be sealed to prevent contamination from entering the suspension arm assembly <NUM>, Furthermore, the arms <NUM> can have any cross-sectional shape (e.g., square, circular and/or rectangular). Moreover, it is contemplated that the suspension arm assembly <NUM> could include mechanisms to hold the arms <NUM> in a particular rotated position (e.g., springs, balls, wedges, toggles, etc.). Additionally, it is contemplated that the cabling <NUM> could have one or a plurality of connectors (e.g., a SC, LC, FC, ST, SMA or pigtail type connector) within each arm for connecting a first part of the cabling in an arm to a second part of the cabling in an arm (e.g., to assist in routing the cabling <NUM> through each arm). Furthermore, it is contemplated that the cabling <NUM> only need to extend to an end item requiring the high definition data (which includes ultrahigh definition data and data that results in resolution above standard definition resolution) to be sent thereto (e.g., if a monitor is directly connected the extension arm <NUM>, the fiber optic cable could only travel through the first infinite rotation joint <NUM> to the monitor, with other cabling traveling through the arms <NUM> to another area of the arms). If the cabling <NUM> does not travel to the end of the arms <NUM>, it is contemplated that the arms after the end of the cabling do not need to have any further infinite rotation joints. Furthermore, it is contemplated that less than all of the joints of the suspension arm assembly <NUM> could have infinite rotation. For example, it is contemplated that the first joint <NUM> or both the first joint <NUM> and the second joint <NUM> could include stops preventing unlimited rotation at these joints. In such a situation, it is contemplated that the infinite rotation fiber optic and slip ring joint <NUM> could still be used at these joints to transmit power and data, only with stops limiting rotation, or that these joints could have other configurations for transmitting power and data with mechanical stops limiting rotation (with, for example, all of the wiring passing directly through these joints).

The reference numeral 10a (<FIG>) generally designates an embodiment of the present invention, having a second embodiment for the suspension arm assembly of the present disclosure. Since suspension arm assembly 10a is similar to the previously described suspension arm assembly <NUM>, similar parts appearing in <FIG> and <FIG>, respectively, are represented by the same, corresponding reference number, except for the suffix "a" in the numerals of the latter. The second embodiment of the suspension arm assembly 10a is substantially similar to the first embodiment of the suspension arm assembly <NUM>, except that the second embodiment of the suspension arm assembly 10a includes a separable infinite rotation fiber optic and slip ring joint <NUM> in place of the infinite rotation fiber optic and slip ring joint <NUM>. The separable infinite rotation fiber optic and slip ring joint <NUM> is located at any or all of the first infinite rotation joint 28a between the ceiling attachment member 24a and the extension arm 26a, the second infinite rotation joint 32a between the extension arm 26a and the load counterbalancing spring arm 30a, and the third infinite rotation joint 34a between the display support assembly 18a and the load counterbalancing spring arm 30a. The separable infinite rotation fiber optic and slip ring joint <NUM> allows for automatic connection of the fiber optic cable and the remaining wires of the cabling system on both sides of the joints 28a, 30a, 32a when the elements on both sides of the joints 28a, 30a, 32a are connected (e.g., when the extension arm 26a is connected to the ceiling attachment member 24a). The separable infinite rotation fiber optic and slip ring joint <NUM> allows for easier assembly of the suspension arm assembly 10a. It is contemplated that the separable infinite rotation fiber optic and slip ring joint <NUM> could be used at any intersection or joint for allowing for unlimited rotation of the joint along with passing information through the joint via a fiber optic cable and other wiring.

In the illustrated example, the separable infinite rotation fiber optic and slip ring joint <NUM> is configured to be separated to allow for easy assembly and disassembly. It is contemplated that the separable infinite rotation fiber optic and slip ring joint <NUM> could be separable by having the rotor 114a being separable from the stator 106a, by having a two-part separable rotor 114a and/or by having a two-part separable stator 106a. In the illustrated embodiment, the separate parts of the separable infinite rotation fiber optic and slip ring joint <NUM> automatically engage when the elements on both sides of the joints 28a, 30a, 32a are connected. Therefore, the separable elements of the separable infinite rotation fiber optic and slip ring joint <NUM> can be connected without using any tools directly thereon to be able to pass signals over the fiber optic cable and the wires of the separable infinite rotation fiber optic and slip ring joint <NUM>.

<FIG> illustrate an embodiment of the separable infinite rotation fiber optic and slip ring joint <NUM> wherein the separable infinite rotation fiber optic and slip ring joint <NUM> is separable by having a two-part separable rotor 114a. The two-part separable rotor 114a includes a main rotor <NUM> and a rotor connector <NUM> that is removably connected to the main rotor <NUM>. The main rotor <NUM> in the illustrated embodiment is fixed to the stator 106a. In the present example, when any of the arms 12a are connected together, the main rotor <NUM> and the stator 106a will be fixed together in one arm 12a and the rotor connector <NUM> will be in the other arm 12a. While the rotor connector <NUM> in <FIG> is illustrated as not being connected to the adjacent element (e.g., the ceiling attachment member 24a or the extension arm 26a at the second infinite rotation joint 32a) the rotor connector <NUM> would be fixed to the adjacent element as the suspension arm assembly 10a is assembled. Likewise, the main rotor <NUM> and the stator 106a will also be fixed to the adjacent element (e.g., the extension arm 26a at the first infinite rotation joint 28a) as the suspension arm assembly 10a is assembled. Each of the separable parts of the separable infinite rotation fiber optic and slip ring joint <NUM> (whether the rotor and stator are separable or when the rotor or the stator are in two separate parts) will be fixed to the adjacent element as the suspension arm assembly 10a is assembled. Moreover, each of the separable parts of the separable infinite rotation fiber optic and slip ring joint <NUM> (whether the rotor and stator are separable or when the rotor or the stator are in two separate parts) would be attached to their respective arm components (e.g. spring arm, extension arm), and would remain attached to the arm components during disassembly (i.e., separation of the arm components).

The illustrated main rotor <NUM> (<FIG>) connects to the rotor connector <NUM> to form the separable infinite rotation fiber optic and slip ring joint <NUM>. The main rotor <NUM> includes a stepped tube <NUM> having a small insertion tube section <NUM>, a large outer tube section <NUM> and a stepped section <NUM> between the small insertion tube section <NUM> and the large outer tube section <NUM>. The stepped tube <NUM> has an axial opening <NUM> therethrough for accommodating the fiber optic cable as discussed in more detail below. The small insertion tube section <NUM> has an insertion end <NUM> opposite the stepped section <NUM> configured to be inserted into the stator 106a. The stepped section <NUM> includes a first radial abutment face <NUM> at the small insertion tube section <NUM>, a step surface <NUM> having a circumferential groove <NUM> therein and a second radial abutment face <NUM> at the large outer tube section <NUM>. The circumferential groove <NUM> on the step surface <NUM> of the stepped section <NUM> is configured to receive a pair of locking members <NUM> to fix the main rotor <NUM> to the stator 106a. The large outer tube section <NUM> includes an axial counterbore <NUM> facing away from the stepped section <NUM> for receiving the rotor connector <NUM> therein.

The illustrated main rotor <NUM> has a plurality of conduit paths therethrough. Each conduit path is formed by a contact ring <NUM>, an interior conductive path <NUM> and an extension pin <NUM>. As illustrated in <FIG> and <FIG>, the small insertion tube section <NUM> includes a plurality of circumferential orientated and axially spaced channels <NUM>, with each channel <NUM> receiving one of the contact rings <NUM> therein. An interior surface of each of the contact rings <NUM> abuts one of the interior conductive paths <NUM>, which pass through the stepped section <NUM> to engage the extension pin <NUM> that extends into the axial counterbore <NUM> in the large outer tube section <NUM> (see <FIG>). The interior conductive paths <NUM> are each located at a different radial position within the stepped section <NUM> (with only one of the interior conductive paths <NUM> being illustrated in <FIG> and <FIG>). <FIG> illustrates an example of radial positions of the extension pins <NUM>, with the conductive paths <NUM> substantially corresponding to the radial positions of the extension pins <NUM>. While nine groups of contacts each comprising one of the contact rings <NUM>, one of the conductive paths <NUM> and one of the extension pins <NUM> are shown, it is contemplated that any number of groups of contacts could be used. In the illustrated embodiment, the three contact rings <NUM> closest to the stepped section <NUM> conduct power (e.g., ground, AC power and low voltage) and the remaining contact rings <NUM> conduct data. Each of the extension pins <NUM> is received within a corresponding slot in the rotor connector <NUM> as discussed in more detail below.

In the illustrated example, the stator 106a fixedly receives the main rotor <NUM> therein. The stator 106a (<FIG> and <FIG>) includes an outer housing <NUM> and an inner housing <NUM> received within the outer housing <NUM>. The inner housing <NUM> (<FIG>, <FIG>, <FIG> and <FIG>) includes an inner housing cylinder <NUM> having a main rotor receiving end <NUM> and a closed end <NUM>. The inner housing cylinder <NUM> includes a plurality of axially extending data leaf spring contact channels <NUM> for accepting data leaf spring contacts <NUM> (<FIG>) therein (see <FIG>). Each of the data leaf spring contact channels <NUM> includes an axially open side <NUM> at the closed end <NUM> of the inner housing cylinder <NUM> and an inner stop wall <NUM> opposite the closed end <NUM>. As illustrated in <FIG>, the data leaf spring contact channels <NUM> include a radial opening <NUM> into an interior of the inner housing cylinder <NUM> adjacent the inner stop wall <NUM>. Each of the radial openings <NUM> are at different axial positions to allow the data leaf spring contacts <NUM> within each data leaf spring contact channel <NUM> to contact a different one of the data contact rings <NUM> in the main rotor <NUM> of the rotor 114a. The illustrated example includes a pair of opposite sets of data leaf spring contact channels <NUM>, with three data leaf spring contact channels <NUM> in each set. However, any number of data leaf spring contact channels <NUM> could be used.

The illustrated inner housing cylinder <NUM> also includes a plurality of axially extending power leaf spring contact channels <NUM> for accepting power leaf spring contacts <NUM> therein (see <FIG>). Each of the power leaf spring contact channels <NUM> includes a radially and axially open side <NUM> at the closed end <NUM> of the inner housing cylinder <NUM>. As illustrated in <FIG>, the power leaf spring contact channels <NUM> include a radial opening <NUM> into an interior of the inner housing cylinder <NUM> at an end of the power leaf spring contact channels <NUM> opposite the closed end <NUM> of the inner housing cylinder <NUM>. Each of the radial openings <NUM> are at different axial positions to allow the power leaf spring contacts <NUM> within each power leaf spring contact channel <NUM> to contact a different one of the power contact rings <NUM> in the main rotor <NUM> of the rotor 114a.

As illustrated in <FIG>, the inner housing <NUM> includes a closed end wall <NUM> axially spaced from the closed end <NUM>, with the closed end wall <NUM> being axially located such that the radially and axially open side <NUM> of the power leaf spring contact channels <NUM> are located between the closed end wall <NUM> and the closed end <NUM> of the inner housing <NUM>. A central tube <NUM> extends through the closed end wall <NUM> from the closed end <NUM> and into an interior of the inner housing <NUM>, wherein the central tube <NUM> includes an exterior section <NUM> and an interior alignment section <NUM>. As illustrated in <FIG>, a spanning member <NUM> extending radially from the exterior section <NUM> of the central tube <NUM> divides a pair of the power leaf spring contact channels <NUM>.

In the illustrated example, the outer housing <NUM> of the stator 106a accepts the inner housing <NUM> of the stator 106a therein. The outer housing <NUM> includes an outer housing cylinder <NUM> having a receiving end <NUM> and a closed end <NUM>. The outer housing cylinder <NUM> includes a pair of circumferential slots <NUM> adjacent the receiving end <NUM> for receiving the locking members <NUM> therein for locking the main rotor <NUM> to the stator 106a as discussed in more detail below. The outer housing cylinder <NUM> includes a recessed area <NUM> extending axially from the closed end <NUM> to a stepped bottom edge <NUM>. The recessed area <NUM> defines a section of the outer housing cylinder <NUM> with a thickness smaller than the remaining portion of the outer housing cylinder <NUM>. The closed end <NUM> of the outer housing cylinder <NUM> includes an interrupted end cap <NUM> including a first C-shaped portion <NUM>, a second C-shaped portion <NUM> and a triangular portion <NUM>. A plurality of axial openings <NUM> extend into the recessed area <NUM> between each of the first C-shaped portion <NUM>, the second C-shaped portion <NUM> and the triangular portion <NUM>. A radially inner edge <NUM> of the first C-shaped portion <NUM> includes a plurality of grooves <NUM> for receiving a portion of the data leaf spring contacts <NUM> therein and a radially inner edge <NUM> of the second C-shaped portion <NUM> includes a plurality of grooves <NUM> for receiving a portion of the data leaf spring contacts <NUM> therein.

The illustrated data leaf spring contacts <NUM> (<FIG>) are configured to be located between the inner housing <NUM> and the outer housing <NUM> of the stator 106a. The data leaf spring contacts <NUM> each include a central flat portion <NUM>, a pair of contact leaf springs <NUM> at a first edge of the central flat portion <NUM> and an L-shaped connecter <NUM> having a hole <NUM> at the second edge of the central flat portion <NUM>. As illustrated in <FIG>, the central flat portions <NUM> of the data leaf spring contacts <NUM> are received within the data leaf spring contact channels <NUM> of the inner housing cylinder <NUM>. The pair of contact leaf springs <NUM> of the data leaf spring contacts <NUM> extend through the radial opening <NUM> to contact the contact rings <NUM> as illustrated in <FIG> and <FIG>. An interior surface of the outer housing cylinder <NUM> includes a plurality of axially extending projections <NUM> for holding the central flat portion <NUM> of the data leaf spring contacts <NUM> in place within the data leaf spring contact channels <NUM> when the inner housing <NUM> is inserted into the outer housing <NUM>. The L-shaped connecter <NUM> of the data leaf spring contacts <NUM> abuts an inner edge of the grooves <NUM>, <NUM> in the first C-shaped portion <NUM> and the second C-shaped portion <NUM> of the interrupted end cap <NUM> of the outer housing cylinder <NUM> of the stator 106a as illustrated in <FIG>.

In the illustrated example, the power leaf spring contacts <NUM> (see <FIG>, <FIG>) are configured to be located between the inner housing <NUM> and the outer housing <NUM> of the stator 106a. The power leaf spring contacts <NUM> each include a central flat portion <NUM>, a pair of contact leaf springs <NUM> at a first edge of the central flat portion <NUM> and an U-shaped connecter <NUM> at the second edge of the central flat portion <NUM>. As illustrated in <FIG>, the central flat portions <NUM> of the power leaf spring contacts <NUM> are received within the power leaf spring contact channels <NUM> of the inner housing cylinder <NUM>. The pair of contact leaf springs <NUM> of the power leaf spring contacts <NUM> extend through the radial opening <NUM> to contact the contact rings <NUM> as illustrated in <FIG> and <FIG>. An interior surface of the outer housing cylinder <NUM> includes a plurality of axially extending projections <NUM> (see <FIG>) for holding the central flat portion <NUM> of the power leaf spring contacts <NUM> in place within the power leaf spring contact channels <NUM> when the inner housing <NUM> is inserted into the outer housing <NUM>. The U-shaped connecter <NUM> of the power leaf spring contacts <NUM> is located in the radially and axially open side <NUM> of the power leaf spring contact channels <NUM> and the axial openings <NUM> of the outer housing cylinder <NUM>.

The illustrated inner housing <NUM> of the stator 106a is fixed in position within the outer housing <NUM> of the stator 106a. As illustrated in <FIG>, the data leaf spring contacts <NUM> are positioned within the data leaf spring contact channels <NUM> of the inner housing cylinder <NUM> and the power leaf spring contacts <NUM> are positioned within the power leaf spring contact channels <NUM> of the inner housing cylinder <NUM>. The inner housing <NUM> of the stator 106a is then inserted into the outer housing <NUM> of the stator 106a to form the stator 106a. The interrupted end cap <NUM> at the closed end <NUM> of the outer housing cylinder <NUM> helps to ensure that the inner housing <NUM> of the stator 106a is properly orientated in the outer housing <NUM>. Furthermore, as illustrated in <FIG>, a pin <NUM> can be inserted through the outer housing <NUM> and into the inner housing <NUM> (or into one of the channels <NUM>, <NUM> (as shown)) to prevent relative rotation of the outer housing <NUM> and the inner housing <NUM>. It is contemplated that the outer housing <NUM> and the inner housing <NUM> could be fixed in relative position in any manner.

In the illustrated example, the main rotor <NUM> of the rotor 114a is fixedly, but rotatably, connected to the stator 106a. The main rotor <NUM> is connected to the stator 106a by first inserting the small insertion tube <NUM> of the stepped tube <NUM> of the main rotor <NUM> into the inner housing <NUM> of the stator 106a.

As illustrated in <FIG>, the insertion end <NUM> of the small insertion tube section <NUM> has an internal annular shelf <NUM> surrounding the axial opening <NUM> in the main rotor <NUM>. The internal section <NUM> of the central tube <NUM> of the inner housing cylinder <NUM> is inserted into the internal annular shelf <NUM> to locate the main rotor <NUM> in the stator 106a and is employed as a bearing during rotation of the main rotor <NUM> within the stator 106a. After the main rotor <NUM> is fully inserted into the stator 106a, the locking members <NUM> are inserted through the slots <NUM> in the outer housing cylinder <NUM> and into the groove <NUM> in the stepped section <NUM> of the stepped tube <NUM> of the main rotor <NUM>. As illustrated in <FIG>, the locking members <NUM> have ramped projections <NUM> that allow the locking members <NUM> to be inserted into the slots <NUM>, but that lock the locking members <NUM> into the slots <NUM> when fully inserted into the slots <NUM>. As illustrated in <FIG>, the main rotor receiving end <NUM> of the inner housing cylinder <NUM> of the inner housing <NUM> abuts the first radial abutment face <NUM> of the stepped section <NUM> of the stepped tube <NUM> of the main rotor <NUM> and the receiving end <NUM> of the outer housing cylinder <NUM> of the outer housing <NUM> abuts the second radial abutment face <NUM> of the stepped section <NUM> of the stepped tube <NUM> of the main rotor <NUM> when the main rotor <NUM> is fully inserted into the stator 106a. The data wires of the wiring in the arms 12a are connected to the L-shaped connectors <NUM> of the power leaf spring contacts <NUM> and the stator 106a with the main rotor <NUM> connected thereto are then fixed to one of the arms 12a (after a first optical connector <NUM> is inserted into the stator 106a with the main rotor <NUM> connected thereto) to prepare for assembly of the suspension arm assembly 10a.

The illustrated stator 106a with the main rotor <NUM> connected thereto includes the first optical connector <NUM> (<FIG>) that connects to the fiber optic cable of the wiring in the arm 12a and that allows (with a second optical connector <NUM>) the optical signal to be transmitted through the separable infinite rotation fiber optic and slip ring joint <NUM>. The first optical connector <NUM> includes a main holding tube <NUM> for holding the fiber optic cable <NUM> comprising a jacket <NUM> and a fiber optic <NUM>. The main holding tube <NUM> includes an insertion end <NUM>, a holding end <NUM> and an interior aperture <NUM> having the fiber optic cable <NUM> therein (shown with a truncated fiber optic cable <NUM> in <FIG>, but not shown in <FIG>). The interior aperture <NUM> includes a larger section <NUM> and a smaller section <NUM>, with a step <NUM> between the larger section <NUM> and the smaller section <NUM>.

In the illustrated example, the first optical connector <NUM> includes a first distance adjustment assembly <NUM> at the insertion end <NUM> thereof. The first distance adjustment assembly <NUM> provides for differences in distances between the main rotor <NUM> and the rotor connector <NUM> when connected as discussed in more detail below. The first distance adjustment assembly <NUM> includes a coil spring <NUM>, a holding sleeve <NUM>, a lock ring <NUM>, an extension tube <NUM>, an abutment sleeve <NUM> and an optic end holder <NUM>.

The illustrated holding sleeve <NUM> of the first distance adjustment assembly <NUM> holds the first distance adjustment assembly <NUM> on the main holding tube <NUM>. As illustrated in <FIG>, the holding sleeve <NUM> includes an axially extending hole <NUM> with an internal surface <NUM>. The internal surface <NUM> has, moving toward the main holding tube <NUM>, a first area <NUM> with a first diameter, a second area <NUM> with a second diameter, a ramp <NUM> leading to a third area <NUM> with a third diameter and a fourth area <NUM> having a fourth diameter. The third diameter is the largest diameter and the first diameter is the smallest diameter. The second diameter is between the first diameter and the fourth diameter and the fourth diameter is between the third diameter and the second diameter.

In the illustrated example, the holding sleeve <NUM> surrounds the insertion end <NUM> of the main holding tube <NUM> and is connected thereto. As illustrated in <FIG>, an exterior surface of the main holding tube <NUM> includes a recessed circumferential area <NUM> adjacent the insertion end <NUM> and a radially extending lip <NUM> at the terminal end of the insertion end <NUM>. The holding sleeve <NUM> is located on the recessed circumferential area <NUM>. The fourth area <NUM> of the internal surface <NUM> of the hole <NUM> of the holding sleeve <NUM> locks into a slot <NUM> in the recessed circumferential area <NUM> of the main holding tube <NUM> adjacent the radially extending lip <NUM>. Moreover, the radially extending lip <NUM> extends into the third area <NUM> of the internal surface <NUM> of the hole <NUM> of the holding sleeve <NUM> to lock the holding sleeve <NUM> to the main holding tube <NUM>.

As illustrated in <FIG>, the lock ring <NUM> is located between the insertion end <NUM> of the main holding tube <NUM> and a step <NUM> between the first area <NUM> and the second area <NUM> of the internal surface <NUM> of the hole <NUM> of the holding sleeve <NUM>. The lock ring <NUM> locks the extension tube <NUM> within the holding sleeve <NUM>. The extension tube <NUM> is configured to slide within the interior aperture <NUM> of the main holding tube <NUM> at the insertion end <NUM> thereof and to also slide within the first area <NUM> of the internal surface <NUM> of the hole <NUM> of the holding sleeve <NUM>. The extension tube <NUM> includes a circumferential recess <NUM> in an outer surface <NUM> thereof. The circumferential recess <NUM> includes an inner side edge <NUM> and an outer side edge <NUM>. As illustrated in <FIG>, the lock ring <NUM> extends into the circumferential recess <NUM> in the outer surface <NUM> of the extension tube <NUM>. The extension tube <NUM> is allowed to slide within the main holding tube <NUM> and the holding sleeve <NUM> between a fully extended position wherein the lock ring <NUM> abuts the inner side edge <NUM> of the circumferential recess <NUM> and a fully retracted position (shown in <FIG>) wherein the lock ring <NUM> abuts the outer side edge <NUM> of the circumferential recess <NUM>. The abutment sleeve <NUM> surrounds the extension tube <NUM> and can also limit movement of the extension tube <NUM> relative to the main holding tube <NUM>. It is contemplated that the abutment sleeve <NUM> can be made of any material. For example, the abutment sleeve <NUM> could be made of metal or of a ceramic material.

In the illustrated example, the coil spring <NUM> of the first distance adjustment assembly <NUM> is configured to move a portion of the first distance adjustment assembly <NUM> relative to the main holding tube <NUM>. As illustrated in <FIG> and <FIG>, the coil spring <NUM> is located at the insertion end <NUM> of the main holding tube <NUM> and within the smaller section <NUM> of the interior aperture <NUM>. A first end of the coil spring <NUM> abuts the step <NUM> between the larger section <NUM> and the smaller section <NUM> of the interior aperture <NUM>. A second end of the coil spring <NUM> abuts the extension tube <NUM> and biases the extension tube <NUM> to the fully extended position.

The illustrated optic end holder <NUM> is located within the extension tube <NUM> opposite the coil spring <NUM> and holds a terminal end of the fiber optic cable <NUM>. The optic end holder <NUM> includes an outer surface <NUM> engaged with an inner surface <NUM> of the extension tube <NUM>. As illustrated in <FIG>, a circumferential flange <NUM> extends radially outward from an end of the optic end holder <NUM>. The circumferential flange <NUM> prevents the optic end holder <NUM> from sliding further into the extension tube <NUM>. The optic end holder <NUM> has an axial aperture <NUM> with a stepped surface <NUM>. Starting from within the extension tube <NUM>, the stepped surface <NUM> includes a widest diameter area <NUM> receiving the fiber optic cable <NUM>, with the widest diameter area <NUM> holding the jacket <NUM> of the fiber optic cable <NUM>. The stepped surface <NUM> then has a middle diameter area <NUM> holding only the fiber optic <NUM> without the jacket <NUM>. The stepped surface <NUM> then has a smallest diameter area <NUM> that is open. Light leaving the fiber optic travels through the axial aperture <NUM> within the stepped surface <NUM> at the smallest diameter area <NUM>. It is contemplated that the smallest diameter area <NUM> could have a very short axial length such that the fiber optic <NUM> is very near or even at an end of the optic end holder <NUM>. The optic end holder <NUM> includes an abutment end surface <NUM> outside of the smallest diameter area <NUM>. As described in more detail below, the abutment end surface <NUM> is configured to abut or be very close to the second optical connector <NUM>.

In the illustrated example, the first optical connector <NUM> includes a wiring connector <NUM> connected to the holding end <NUM> of the main holding tube <NUM>. The wiring connector <NUM> includes a tube <NUM> having an outside radially extending flange <NUM> dividing the wiring connector <NUM> into a wiring connection end <NUM> and a holding tube connection end <NUM>. The wiring connection end <NUM> of the wiring connector <NUM> surrounds an outside of the fiber optic cable <NUM> and allows the fiber optic cable <NUM> to slide therein if needed for movement of the fiber optic cable <NUM> as outlined below. It is contemplated that instead of having the fiber optic cable <NUM> pass through the tube <NUM>, the wiring connection end can be any connector for connecting to a fiber optic cable (e.g., a SC, LC, FC, ST, SMA or pigtail type connector). The holding tube connection end <NUM> of the wiring connector <NUM> surrounds and is received within a first recessed area <NUM> at the holding end <NUM> of the main holding tube <NUM>. A tube clip <NUM> surrounds the holding tube connection end <NUM> of the wiring connector <NUM> and a second recessed area <NUM> adjacent the first recessed area <NUM>. The tube clip <NUM> includes a pair of extending spring ears <NUM> for fixing the first optical connector <NUM> within the stator 106a.

As illustrated in <FIG>, the first optical connector <NUM> is connected to the stator 106a by inserting the first optical connector <NUM> into the central tube <NUM> of the inner housing <NUM> of the stator 106a, with the optic end holder <NUM> being inserted first into the central tube <NUM>. As the first optical connector <NUM> is inserted into the central tube <NUM> of the inner housing <NUM> of the stator 106a, the extending spring ears <NUM> of the tube clip <NUM> will be depressed toward the second recessed area <NUM> of the main holding tube <NUM> by an interior surface <NUM> of the central tube <NUM>. As illustrated in <FIG>, when the first optical connector <NUM> is fully inserted into the central tube <NUM> of the inner housing <NUM> of the stator 106a, the spring ears <NUM> will expand outward into recesses <NUM> in the interior surface <NUM> of the central tube <NUM> to positively lock the first optical connector <NUM> into the central tube <NUM> of the inner housing <NUM> of the stator 106a and prevent removal of the first optical connector <NUM> from the stator 106a.

As outlined above, the separable infinite rotation fiber optic and slip ring joint <NUM> includes the two-part separable rotor 114a, with the rotor connector <NUM> removably connected to the main rotor <NUM>. The rotor connector <NUM> includes an insertion cylinder <NUM> configured to be inserted into the main rotor <NUM> and an enlarged head <NUM> at an end of the insertion cylinder <NUM>. The rotor connector <NUM> includes a stepped central aperture <NUM> and a plurality of wiring openings <NUM> parallel with and surrounding the stepped central aperture <NUM>. Each of the wiring openings <NUM> is configured to receive one of the extension pins <NUM> of the main rotor <NUM> therein. Each of the wiring openings <NUM> that receive an extension pin <NUM> that conducts power has a conducting tube <NUM> therein as illustrated in <FIG>. Each conducting tube <NUM> includes a female receiving side <NUM> for receiving one of the extension pins <NUM> of the main rotor <NUM> and a male side <NUM> extending into the enlarged head <NUM>, with the male side <NUM> configured to be inserted into a wiring connector as is well known to those skilled in the art. The wiring openings <NUM> that receive the extension pins <NUM> that conduct data each have a conducting connector <NUM> therein as illustrated in <FIG>. Each of the conducting connectors <NUM> has a pair of opposite female receptacles for receiving pins therein for transmitting data as is well known to those skilled in the art.

In the illustrated example, the rotor connector <NUM> is connected to the main rotor <NUM> by inserting the insertion cylinder <NUM> into the axial counterbore <NUM> of the large outer tube section <NUM> of the main rotor <NUM>. As illustrated in <FIG>, the main rotor <NUM> includes an alignment cylinder <NUM> extending into the axial counterbore <NUM> and surrounding the axial opening <NUM> in the main rotor <NUM>. The alignment cylinder <NUM> is received within a largest area <NUM> of the stepped central aperture <NUM> of the rotor connector <NUM>. An inner surface <NUM> of the axial counterbore <NUM> can include one or more alignment flanges <NUM> (see <FIG>) configured to be received within axial slots <NUM> on an outer surface of the insertion cylinder <NUM> of the rotor connector <NUM> for properly aligning the rotor connector <NUM> within the main rotor <NUM>. As illustrated in <FIG>, a floor <NUM> of the axial counterbore <NUM> can also include ridges <NUM> configured to be received in channels <NUM> in a bottom of the insertion cylinder <NUM> for properly aligning the rotor connector <NUM> within the main rotor <NUM>. Some of the ridges <NUM> can include enlarged sections <NUM> to further ensure proper rotational alignment of the insertion cylinder <NUM> to ensure that the proper data and power lines are not mixed up. As illustrated in <FIG>, the head <NUM> can have a radially extending hole <NUM> configured to receive a fastener therein for fixing the rotor connector <NUM> in positon within one of the arms 12a.

The illustrated rotor connector <NUM> includes the second optical connector <NUM> (<FIG> and <FIG>) that connects to the fiber optic cable of the wiring in the arm 12a and that allows (with the first optical connector <NUM>) the optical signal to be transmitted through the separable infinite rotation fiber optic and slip ring joint <NUM>. The second optical connector <NUM> includes a holding tube <NUM> for holding a fiber optic cable <NUM> comprising a jacket <NUM> and a fiber optic <NUM>. The holding tube <NUM> includes an insertion end <NUM>, a holding end <NUM> and an interior aperture <NUM> having the fiber optic cable <NUM> therein (shown with a truncated fiber optic cable <NUM> in <FIG>). A stepped sleeve <NUM> is fixed to an exterior surface <NUM> of the holding tube <NUM>. The stepped sleeve <NUM> includes a lower step <NUM> at the insertion end <NUM> and a higher step <NUM> at the holding end <NUM>. As illustrated in <FIG>, the higher step <NUM> includes an axial slot <NUM> to assist in sliding of the holding tube <NUM> without rotation thereof.

In the illustrated example, the second optical connector <NUM> includes a second distance adjustment assembly <NUM> at the insertion end <NUM> thereof. The second distance adjustment assembly <NUM> provides for differences in distances between the main rotor <NUM> and the rotor connector <NUM> when connected as discussed in more detail below. The second distance adjustment assembly <NUM> includes a coil spring <NUM>, a washer <NUM>, a wiring connector <NUM>, a sliding sleeve <NUM> and an abutment sleeve <NUM> all held within a clip sleeve <NUM>.

The illustrated clip sleeve <NUM> holds the holding tube <NUM>, the stepped sleeve <NUM>, the coil spring <NUM>, the washer <NUM>, the wiring connector <NUM>, the sliding sleeve <NUM> and the abutment sleeve <NUM>. The clip sleeve <NUM> includes a tube <NUM> having a pair of extending spring ears <NUM> for fixing the second optical connector <NUM> within the rotor connector <NUM> as discussed in more detail below. The wiring connector <NUM> is received within a first end of the clip sleeve <NUM>. The wiring connector <NUM> includes a tube <NUM> having an outside radially extending flange <NUM> dividing the wiring connector <NUM> into a wiring connection end <NUM> and a sleeve connection end <NUM>. The wiring connection end <NUM> of the wiring connector <NUM> surrounds an outside of the fiber optic cable <NUM> and allows the fiber optic cable <NUM> to slide therein if needed for movement of the fiber optic cable <NUM> as outlined below. It is contemplated that instead of having the fiber optic cable <NUM> pass through the tube <NUM>, the wiring connection end can be any connector for connecting to a fiber optic cable (e.g., a SC, LC, FC, ST, SMA or pigtail type connector). The sleeve connection end <NUM> of the wiring connector <NUM> is surrounded by the clip sleeve <NUM>. As illustrated in <FIG>, the sleeve connection end <NUM> of the wiring connector <NUM> includes radially extending ramped tabs <NUM> that are inserted into first openings <NUM> in the clip sleeve <NUM> to connect the wiring connector <NUM> to the clip sleeve <NUM>.

In the illustrated example, the coil spring <NUM> pushes against the washer <NUM> to move the holding tube <NUM>. As illustrated in <FIG> and <FIG>, the washer <NUM> is located at (and can be connected to) the holding end <NUM> of the holding tube <NUM>. One end of the coil spring <NUM> pushes against the washer <NUM>. Another end of the coil spring <NUM> abuts against an end rim <NUM> of the sleeve connection end <NUM> of the tube <NUM> of the wiring connector <NUM>. The abutment sleeve <NUM> surrounds and is fixed to the holding tube <NUM> at the insertion end <NUM> thereof. The abutment sleeve <NUM> includes an abutment rim <NUM> opposite the holding tube <NUM>. When the abutment rim <NUM> is pushed, the abutment sleeve <NUM> and thereby the holding tube <NUM> and the washer <NUM> are pushed against the bias of the coil spring <NUM>.

The illustrated sliding sleeve <NUM> surrounds the abutment sleeve <NUM> and the holding tube <NUM> is allowed to slide within the sliding sleeve <NUM>. The sliding sleeve <NUM> includes an outer surface <NUM> with a pair of ramped tabs <NUM>. The sliding sleeve <NUM> is inserted into the clip sleeve <NUM> and the ramped tabs <NUM> are inserted into second openings <NUM> in the clip sleeve <NUM> to connect the sliding sleeve <NUM> to the clip sleeve <NUM>. The sliding sleeve <NUM> includes radially extending projections <NUM> that slide within the axial slots <NUM> in the higher step <NUM> of the stepped sleeve <NUM> to assist in sliding of the holding tube <NUM> without rotation thereof. Engagement of the sliding sleeve <NUM> and the stepped sleeve <NUM> also can limit axial movement of the stepped sleeve <NUM> and the holding tube <NUM> connected thereto.

The illustrated holding tube <NUM> includes an optic end holder <NUM> located within the interior aperture <NUM> thereof opposite the coil spring <NUM>. The optic end holder <NUM> holds a terminal end of the fiber optic cable <NUM>. The optic end holder <NUM> includes an outer surface <NUM> engaged with an inner surface <NUM> of the holding tube <NUM>. The optic end holder <NUM> has an axial aperture <NUM> with a stepped surface <NUM>. Starting from within the holding tube <NUM>, the stepped surface <NUM> includes a widest diameter area <NUM> receiving the fiber optic cable <NUM>, with the widest diameter area <NUM> holding the jacket <NUM> of the fiber optic cable <NUM>. The stepped surface <NUM> then has a middle diameter area <NUM> holding only the fiber optic <NUM> without the jacket <NUM>. The stepped surface <NUM> then has a smallest diameter area <NUM> that is open. Light leaving the fiber optic travels through the axial aperture <NUM> within the stepped surface <NUM> at the smallest diameter area <NUM>. It is contemplated that the smallest diameter area <NUM> could have a very short axial length such that the fiber optic <NUM> is very near or even at an end of the optic end holder <NUM>. The optic end holder <NUM> includes an abutment end surface <NUM> outside of the smallest diameter area <NUM>. As described in more detail below, the abutment end surface <NUM> is configured to abut or be very close to the first optical connector <NUM>.

As illustrated in <FIG>, the second optical connector <NUM> is connected to the rotor connector <NUM> by inserting the second optical connector <NUM> into the stepped central aperture <NUM> of the rotor connector <NUM>, with the abutment sleeve <NUM> being inserted first into the stepped central aperture <NUM>. As the second optical connector <NUM> is inserted into the stepped central aperture <NUM> of the rotor connector <NUM>, the extending spring ears <NUM> of the clip sleeve <NUM> will be depressed inward by an interior surface <NUM> of the stepped central aperture <NUM>. As illustrated in <FIG>, when the second optical connector <NUM> is fully inserted into the stepped central aperture <NUM> of the rotor connector <NUM>, the spring ears <NUM> will expand outward into recesses <NUM> in the interior surface <NUM> of the stepped central aperture <NUM> to positively lock the second optical connector <NUM> into the stepped central aperture <NUM> of the rotor connector <NUM> and prevent removal of the second optical connector <NUM> from the rotor connector <NUM>.

In the illustrated example, the construction of the separable infinite rotation fiber optic and slip ring joint <NUM> allows for variation in distances between the main rotor <NUM> and the rotor connector <NUM> during assembly of the suspension arm assembly 10a. In the illustrated example, the rotor connector <NUM> is inserted into the main rotor <NUM> when the adjacent arms 12a or an arm 12a and either the ceiling attachment member 24a or the display support assembly 18a are connected together. In the illustrated main rotor <NUM>, the extension pins <NUM> are very long and do not need to be fully inserted into the wiring openings <NUM> of the rotor connector <NUM> to be able to transmit power and data. Therefore, if assembly of the suspension arm assembly 10a results in the rotor connector <NUM> not being fully inserted into the main rotor <NUM>, the suspension arm assembly 10a can still transmit power and data through the rotary joints thereof.

The illustrated suspension arm assembly 10a also accommodates distances between the rotor connector <NUM> and the main rotor <NUM> for transmitting information over the fiber optic cables <NUM>, <NUM> through adjustments of the first optical connector <NUM> and the second optical connector <NUM>. As illustrated in <FIG>, when the rotor connector <NUM> is engaged with the main rotor <NUM>, the coil spring <NUM> in the first optical connector <NUM> will bias the optic end holder <NUM> in the first optical connector <NUM> toward the second optical connector <NUM>. Likewise, the coil spring <NUM> in the second optical connector <NUM> will bias the optic end holder <NUM> in the second optical connector <NUM> toward the first optical connector <NUM>. The abutment sleeve <NUM> of the first optical connector <NUM> will abut against abutment rim <NUM> of the abutment sleeve <NUM> of the second optical connector <NUM> to maintain a desired distance between the optic end holder <NUM> in the first optical connector <NUM> and the second optical connector <NUM> toward the first optical connector <NUM>. It is contemplated that the optic end holder <NUM> in the first optical connector <NUM> and the optic end holder <NUM> in the second optical connector <NUM> could abut each other or could be spaced. Furthermore, it is contemplated that the optic end holder <NUM> in the first optical connector <NUM> and the optic end holder <NUM> in the second optical connector <NUM> could have a limited range of motion (e.g., up to <NUM>). The first optical connector <NUM> and the second optical connector <NUM> thereby ensure that the optic end holder <NUM> in the first optical connector <NUM> and the optic end holder <NUM> in the second optical connector <NUM> are sufficiently close to transmit optical signals across the separable infinite rotation fiber optic and slip ring joint <NUM> without significant loss of information.

In the illustrated example, the separable infinite rotation fiber optic and slip ring joint <NUM> can easily be connected during assembly of the arms 12a holding each portion of the separable infinite rotation fiber optic and slip ring joint <NUM>. Many of the features of the separable infinite rotation fiber optic and slip ring joint <NUM> allow for easy assembly and can be used to blind mate the separate portions of the separable infinite rotation fiber optic and slip ring joint <NUM>. For example, the separate portions of the separable infinite rotation fiber optic and slip ring joint <NUM> can be gatherable to allow for the separate portions to gather and align during mating. <FIG>, <FIG> and <FIG> illustrate an example of a gatherable feature of the separable infinite rotation fiber optic and slip ring joint <NUM>. As illustrated in <FIG>, <FIG> and <FIG>, the edge of the large outer tube section <NUM> of the stepped tube <NUM> of the main rotor <NUM> includes an inwardly extending and circular beveled surface <NUM>. Likewise, the insertion cylinder <NUM> of the rotor connector <NUM> includes an edge having an outwardly extending and circular beveled surface <NUM>. The inwardly extending and circular beveled surface <NUM> and the outwardly extending and circular beveled surface <NUM> are configured to abut and center the main rotor <NUM> as the rotor connector <NUM> is inserted into the main rotor <NUM>. The axial slots <NUM> on the insertion cylinder <NUM> of the rotor connector <NUM> and the alignment flanges <NUM> on the inner surface <NUM> of the axial counterbore <NUM> of the large outer tube section <NUM> of the stepped tube <NUM> of the main rotor <NUM> can also assist in mating the separate portions of the separable infinite rotation fiber optic and slip ring joint <NUM>. It is contemplated that further angled surfaces between the main rotor <NUM> and the rotor connector <NUM> can function as a funnel to rotate one of the main rotor <NUM> and the rotor connector <NUM> as they are pressed together to properly align the main rotor <NUM> and the rotor connector <NUM>.

Claim 1:
A suspension arm assembly (10a) comprising:
at least two members (12a, 18a, 26a, 30a) relatively rotatable about each other, each adjacent pair of members being connected to each other by a joint (28a, 32a, 34a), with at least one of the joints comprising an infinite
rotation joint (<NUM>);
the infinite rotation joint allowing the members at the infinite rotation joint to have unlimited rotation relative to one another;
the infinite rotation joint being configured to pass at least an optical signal therethrough;
the infinite rotation joint comprising a stator (106a) and a rotor (114a), at least two portions of the infinite rotation joint being separable such that the infinite rotation joint can be separated into the at least two portions, the at least two portions being configured to be connected to allow the optical signal to pass therethrough once the at least two portions are engaged;
the at least two portions of the infinite rotation joint are engaged by axially sliding a first one of the at least two portions of the infinite rotation joint into a second one of the at least two portions of the infinite rotation joint; and
the first one of the at least two portions of the infinite rotation j oint can transmit at least one of power and data to the second one of the at least two portions of the infinite rotation joint at a plurality of different axial locations of the first one of the at least two portions of the infinite rotation joint relative to the second one of the at least two portions of the infinite rotation joint.