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US 4,752,102 AGranted
Elevating and supporting apparatus
OwnerKeith O. Rasmusseninventor
Life of this patent
Estimating the term…
Abstract
Apparatus having telescoping box-like cage sections and capable of raising a person or object to a desired height and solidly supporting same at such height, the relative movement of the sections being guided by pre-loaded rollers bearing against vertical guide surfaces provided by the flanges of angle iron members forming the vertical edges of the cage sections. A method is disclosed for assembling the apparatus with the rollers pre-loaded against the cooperating guide surfaces by clamping the angle iron members of the outer cage inwardly before connecting them with cross members under tension.
Claims35
A base structure for vertically adjustable dental chairs or the like, comprising
- a base member adapted for resting on a surface such as a floor,
- first guide means on said base member formed to provide first and second sets of vertically extending spaced parallel planar first guide surfaces with the planes of said first set substantially perpendicular to the planes of said second set,
- second guide means adapted for supporting a dental chair seat structure and formed to provide first and second sets of vertically extending spaced parallel second guide surfaces with the planes of said first set of said second guide surfaces substantially perpendicular to the planes of said second set of said second guide surfaces,
- said first and second sets of said guide surfaces on said first guide means being in parallel spaced mutually confronting relationship to said first and second sets respectively of said guide surfaces on said second guide means,
- a cylindrical upper roller journaled to each of said guide surfaces on said first guide means adjacent to the upper end thereof and with the periphery of each of said rollers in rolling engagement with the guide surface confronting the guide surface to which such upper roller is journaled,
- a cylindrical lower roller journaled to each of said guide surfaces on said second guide means adjacent to the lower end thereof and with the periphery of each of said rollers in rolling engagement with the guide surface confronting the guide surface to which such lower roller is journaled,
- tensioning means connected under tension between said guide means for holding each of said rollers in tightly pressed engagement with the guide surface it contacts,
- and elevating means connected between said base member and said dental chair seat structure and formed for relative displacement of said first and second guide means vertically and with each of said rollers rolling along the guide surface it contacts during said relative displacement.
5 more elements
Elevating and supporting apparatus, comprising a horizontally extending base member,
- four vertically upstanding elongated guide members positioned at the corners of a horizontal rectangle on said base member and extending upwardly therefrom to form a first rectangular cage,
- each of said upstanding guide members providing first and second planar guide surfaces perpendicular to each other and extending substantially the length of said upstanding guide members,
- a second rectangular cage mounted for vertical movement above said base member and having four elongated guide members vertically positioned to form the vertical edges of said second cage,
- each of said guide members of the second cage providing first and second planar guide surfaces perpendicular to each other and extending substantially the length of said depending guide members,
- said first and second planar guide surfaces on said upstanding guide members being positioned in parallel spaced relation to said first and second planar guide surfaces on the guide members of the second cage,
- first rollers journaled on each of said upstanding guide members in rolling engagement with said first and second planar guide surfaces on each of said guide members of the second cage,
- second rollers journaled on each of said guide members of the second cage in rolling engagement with said first and second planar guide surfaces on each of said upstanding guide members,
- tensioning means connected under tension between said upstanding guide members for holding each of said rollers in tightly pressed engagement with the guide surfaces they contact,
- and elevating means connected between said base member and said second cage and formed for selective relative displacement of said second cage vertically with respect to said base member and said first cage, with said rollers rolling along the guide surfaces they contact during said relative displacement.
6 more elements
Elevating and supporting apparatus, comprising
- a base element,
- first guide means mounted on said base element and formed to provide first and second sets of vertically extending spaced parallel planar first guide surfaces with the planes of said first set substantially perpendicular to the planes of the second set,
- second guide means adapted for supporting an object and formed to provide first and second sets of vertically extending spaced parallel second planar guide surfaces with the planes of said first set of said second guide surfaces substantially perpendicular to the planes of said second set of said second guide surfaces,
- said first and second sets of said guide surfaces on said first guide means being in parallel spaced mutually confronting relationship to said first and second sets respectively of said guide surfaces on said second guide means,
- a cylindrical upper roller journaled to each of said guide surfaces on said first guide means adjacent to the upper end thereof and with the periphery of each of said rollers in rolling engagement with the guide surface confronting the guide surface to which such upper roller is journaled,
- a cylindrical lower roller journaled to each of said guide surfaces on said second guide means adjacent to the lower end thereof and with the periphery of each of said rollers in rolling engagement with the guide surface confronting the guide surface to which such lower roller is journaled,
- tensioning means connected under tension between said guide means for holding each of said rollers in tightly pressed engagement with the guide surface it contacts,
- and elevating means connected between said base element and said second guide means and formed for relative displacement of said first and second guide means vertically and with each of said rollers rolling along the guide surface it contacts during said relative displacement.
5 more elements
Dependencies are inferred from the claim text.