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A trolley and rail system for use in relation to an extension and retraction arrangement with a trolley structure retained for axial extension and retraction along a body portion of a rail arrangement comprising first and second rails disposed in substantially parallel spaced orientation. The trolle

A trolley and rail system for use in relation to an extension and retraction arrangement with a trolley structure retained for axial extension and retraction along a body portion of a rail arrangement comprising first and second rails disposed in substantially parallel spaced orientation. The trolley structure can have a central portion and first and second wing portions with load bearing wheels for rolling along rigid bearing surfaces of the first and second rails. The bearing surfaces and the wheels can have correspondingly contoured profiles. The trolley structure can have a ventrally disposed alcove. Constant force springs can assist in a travel of the trolley structure in relation to the rail arrangement. The trolley structure or a support arm coupled thereto can have threaded mounting holes for retaining a flat panel monitor.

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I claim as deserving the protection of Letters Patent: 1. A trolley and rail system for use in relation to an extension and retraction arrangement, the trolley and rail arrangement comprising: a trolley structure; a rail arrangement with a first end, a second end, and a body portion wherein the rai

I claim as deserving the protection of Letters Patent: 1. A trolley and rail system for use in relation to an extension and retraction arrangement, the trolley and rail arrangement comprising: a trolley structure; a rail arrangement with a first end, a second end, and a body portion wherein the rail arrangement comprises first and second rails retained in substantially parallel spaced orientation relative to one another; a means for retaining the trolley structure in relation to the rail arrangement for axial extension and retraction along the body portion of the rail arrangement; wherein the trolley structure has a first portion for engaging the first rail, a second portion for engaging the second rail, and a body portion between the first and second portions and wherein the body portion has an alcove therein disposed inboard of the first and second rails; and a means for retaining an article to be supported in relation to the alcove in the body portion of the trolley structure wherein the means for retaining an article to be supported comprises a support arm with a first end coupled to the trolley structure within the alcove in the body portion of the trolley structure, an elongate body portion that projects beyond the alcove in the body portion of the trolley structure, and a second end spaced from the first end of the support arm. 2. The trolley and rail system of claim 1 wherein each of the first and second rails comprises a cylindrical support rod with a first end and a second end and wherein the means for retaining the trolley structure comprises first and second tubular bushings for matingly receiving the first and second rails in a slidable relationship. 3. The trolley and rail system of claim 2 further comprising bearings interposed between the first and second tubular bushings and the first and second rails. 4. The trolley and rail system of claim 1 further comprising a first mounting base that retains the first ends of the first and second rails and a second mounting base that retains the second ends of the first and second rails and further comprising a means for asisting a travel of the trolley structure toward the first ends of the first and second rails. 5. The trolley and rail system of claim 1 further comprising a means for assisting a travel of the trolley structure toward the first ends of the first and second rails wherein the means for assisting the travel of the trolley structure comprises at least one constant force spring coupled to the trolley structure and to the first mounting base. 6. A trolley and rail system for use in relation to an extension and retraction arrangement, the trolley and rail arrangement comprising: a trolley structure with a central portion and first and second wing portions; a rail arrangement with a first end, a second end, and a body portion wherein the rail arrangement comprises first and second rails retained in substantially parallel spaced orientation relative to one another and wherein each of the first and second rails has a dorsal side, a ventral side, and a rigid bearing surface; a means for retaining the trolley structure in relation to the rail arrangement for axial extension and retraction along the body portion of the rail arrangement; at least one load bearing wheel rotatably retained in relation to each of the first and second wing portions of the trolley structure for engaging the respective rigid bearing surfaces of the first and second rails; wherein each of the first and second rails has a rigid dorsal bearing surface facing the dorsal side of the respective rail and a rigid ventral bearing surface facing the ventral side of the respective rail, wherein the rigid dorsal bearing surface of each rail is disposed in general opposition to and in a facing relationship with the rigid ventral bearing surface of the respective rail, and wherein the trolley structure has at least one load bearing wheel disposed to engage the rigid dorsal bearing surface and at least one load bearing wheel to engage the rigid ventral bearing surface whereby the load bearing wheels are disposed between the dorsal and ventral bearing surfaces of the first and second rails and whereby the load bearing wheels can impart opposed dorsal and ventral forces on the first and second rails. 7. The trolley and rail system of claim 6 further comprising a means for retaining a supported article in relation to the trolley structure. 8. The trolley and rail system of claim 7 wherein the means for retaining a supported article comprises a plurality of threaded mounting holes disposed in accordance with the Video Electronics Standards Association Flat Display Mounting Standard for flat panel monitors. 9. The trolley and rail system of claim 6 wherein the rigid bearing surfaces of the first and second rails and the load bearing wheels of the first and second wing portions of the trolley structure have correspondingly contoured profiles. 10. The trolley and rail system of claim 6 wherein the first and second wing portions of the trolley structure each has a first end proximal to the first end of the rail arrangement and a second end proximal to the second end of the rail arrangement and wherein each wing portion has at least one primary load bearing wheel disposed to the ventral side of the respective wing portion adjacent to the first end thereof and at least one primary load bearing wheel disposed to the dorsal side of the respective wing portion adjacent to the second end thereof. 11. The trolley and rail system of claim 10 wherein there are at least two primary load bearing wheels disposed to the ventral side of the respective wing portion adjacent to the first end thereof and at least two primary load bearing wheels disposed to the dorsal side of the respective wing portion adjacent to the second end thereof and further comprising a stabilizing wheel disposed to the dorsal side of each wing portions adjacent to the upper ends thereof and to the ventral side of the wing portions adjacent to the lower ends thereof. 12. The trolley and rail system of claim 6 wherein each load bearing wheel is rotatably retained in relation to the respective wing portion by an axle received into an aperture in the wing portion with a bushing interposed between the axle and the wheel wherein each bushing has a narrowed tip for being received into the aperture in the wing portion around the axle thereby to ensure a centering and precise location of the load bearing wheel. 13. The trolley and rail system of claim 6 wherein the central portion of the trolley structure has a ventrally disposed alcove therein and further comprising a means for retaining an article to be supported in relation to the alcove. 14. The trolley and rail system of claim 6 further comprising a dorsally disposed rigid spine member fixed to the first and second rails. 15. The trolley and rail system of claim 6 further comprising at least one constant force spring for assisting in a travel of the trolley structure in relation to the rail arrangement wherein the constant force spring has a body portion rotatably retained in relation to one of the rail arrangement and the trolley structure and an end portion fixed in relation to the other of the rail arrangement and the trolley structure. 16. A trolley and rail system for use in relation to an extension and retraction arrangement, the trolley and rail arrangement comprising: a rail arrangement comprising first and second rails retained in substantially parallel spaced orientation relative to one another wherein each rail has a dorsal side, a ventral side, a first end, a second end, and a body portion with a rigid bearing surface therealong; a trolley structure with a central portion and first and second wing portions wherein the central portion of the trolley structure has a ventrally disposed alcove therein disposed inboard of the first and second rails; at least one load bearing wheel rotatably retained in relation to each of the first and second wing portions of the trolley structure for engaging the respective rigid bearing surfaces of the first and second rails; and a means for retaining an article to be supported in relation to the central portion of the trolley structure wherein the means for retaining an article to be supported comprises a support arm with a first end coupled to the alcove in the central portion of the trolley structure, an elongate body portion that projects beyond the alcove in the body portion of the trolley structure, and a second end spaced from the first end of the support arm. 17. The trolley and rail system of claim 16 further comprising first and second constant force springs for assisting in a travel of the trolley structure in relation to the rail arrangement wherein the first constant force spring has a body portion rotatably retained in relation to one of the first rail and the trolley structure and an end portion fixed in relation to the other of the first rail and the trolley structure and wherein the second constant force spring has a body portion rotatably retained in relation to one of the second rail and the trolley structure and an end portion fixed in relation to the other of the second rail and the trolley structure. 18. The trolley and rail system of claim 16 wherein the rigid bearing surfaces of the first and second rails and the load bearing wheels of the first and second wing portions of the trolley structure have correspondingly contoured profiles. 19. The trolley and rail system of claim 16 wherein the first and second rails each has a rigid dorsal bearing surface facing the dorsal side of the respective rail and a rigid ventral bearing surface facing the ventral side of the respective rail and wherein the trolley structure has at least one load bearing wheel disposed to engage the rigid dorsal bearing surface and at least one load bearing wheel to engage the rigid ventral bearing surface whereby the load bearing wheels can impart opposed dorsal and ventral forces on the first and second rails. 20. The trolley and rail system of claim 16 further comprising a dorsally disposed rigid spine member fixed to the first and second rails. 21. The trolley and rail system of claim 16 wherein the means for retaining a supported article includes a plurality of threaded mounting holes in accordance with the Video Electronics Standards Association Flat Display Mounting Standard for flat panel monitors. 22. The trolley and rail system of claim 21 further comprising a flat panel monitor.