US3865341A - Dental stool for dentist and dental assistant - Google Patents
Dental stool for dentist and dental assistant Download PDFInfo
- Publication number
- US3865341A US3865341A US386602A US38660273A US3865341A US 3865341 A US3865341 A US 3865341A US 386602 A US386602 A US 386602A US 38660273 A US38660273 A US 38660273A US 3865341 A US3865341 A US 3865341A
- Authority
- US
- United States
- Prior art keywords
- cylinder
- seat structure
- movement
- fluid
- movable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
- A47C3/20—Chairs or stools with vertically-adjustable seats
- A47C3/30—Chairs or stools with vertically-adjustable seats with vertically-acting fluid cylinder
Definitions
- the stool is provided with a self-contained source of fluid under pressure and has a seat structure, vertically adjustable by manipulation of a single actuating lever mounted on and below the seat structure. The rate of fluid flow is valve controlled to provide for a rapid elevation of the unloaded seat structure and a slow descent of the loaded seat structure to a selected adjusted position. In the adjusted position the seat structure is automatically mechanically locked against vertical movement by simply releasing the actuating lever.
- the stool is of a simple construction and efficient in operation to provide a quick and safe vertical adjustment of the seat structure to a mechanically locked adjusted position.
- the actuating lever for controlling the seat adjustment is located immediately below and within the dimensional confines of the seat for convenient accessibility and non-interference with a normal use of the chair. On actuation of the lever the seat structure, with a person thereon, is slowly movable downwardly to an adjusted position which is retained on release of the lever.
- FIG. 1 is a perspective view of the stool of this invention
- FIG. 2 is an enlarged foreshortened elevational view of the stool taken along the line 22 in FIG. 1;
- FIG. 3 is a sectional view taken on line 3-3 in FIG. 2, showing an actuating lever for vertically adjusting the stool seat;
- FIG. 4 is a detail sectional view on line 44 in FIG. 2, showing the means for mechanically locking the stool seat in a seat releasing position;
- FIG. 5 is a longitudinal sectional view through the supporting column for the stool seat showing the parts in relative positions providing for the mechanical locking of the seat in a lowermost adjusted position;
- FIG. 6 is an enlarged showing of the control valve assembly shown in FIG. 5;
- FIG. 7 is illustrated similarly to FIG. 5 and shows the parts in changed positions showing the seat in an uppermost adjusted position
- FIG. 8 is an enlarged showing of the control valve assembly shown in FIG. 7.
- FIG. 1 the stool of this invention is illustrated in FIG. 1 as including a base assembly 10, a vertically extendible and retractable seat center post or supporting column 11 mounted on the base assembly, and a seat structure 12 carried on the upper end of the post 11.
- the base assembly (FIGS. 1 and 5) comprise a hollow cylindrically shaped hub member 13, integrally formed with radially extended legs 14, each of which carries a floor engaging caster wheel 16.
- the center post II (FIG. 5) includes a tubular cylinder l7, projected axially upwardly from the hub member 13, with its lower end section 18 extended downwardly within and secured to the hub member 13.
- the hub member 13 functions as a fluid reservoir and is formed with a generally cylindrical fluid chamber 19 for a purpose to appear later.
- a piston 21 for the cylinder 17 has an elongated piston rod 22, the upper end of which is secured by a pin 23 to the upper end of a cylindrical sleeve 24 that is mounted about the upper III end section 26 of the cylinder 17 for slidable reciprocal movement relative thereto.
- the top of the slidable sleeve 24 is received within a socket member 27 that depends centrally from the underside of a base plate 28 for the stool seat 29 of the seat structure 12. Friction or clamping screws 30 are used to secure the base plate 28 to the upper end 26 of the slidable sleeve 24, which is movable as a unit with the piston rod 22 relative to the cylinder I7.
- Mounted about the slidable sleeve 24 for relative axial movement is a supporting sleeve 31 for a ring shaped cam member 32 that is secured to the lower-end of the supporting sleeve.
- the cam member 32 is formed on its inner side with a peripheral cam surface 33 that is inclined outwardly and downwardly relative to the adjacent lower end 34 of the slidable sleeve 24.
- Such lower end 34 has a pair of diametrically opposite openings 36 for receiving therein corresponding ball bearing or locking members 37.
- the upper end section 26 of the cylinder 17 is formed with a series of vertically spaced grooves 38 of a semicylindrical shape in transverse cross section and of a size to receive therein a portion of a ball member 37.
- the ball members 37 are engaged by the cam surface 33 and laterally moved through associated openings 36 for partial reception into a selected groove 38 to mechanically lock the slidable sleeve against movement axially of the cylinder 17.
- the ball members 37 are located within the outer peripheral confines of the slidable sleeve 24, and in a mating relation within a selected groove 38.
- a ball member 37 thus has a diameter substantially equal to the combined thickness of the slidable sleeve 24 and the depth of a groove 38. It is to be further noted that this mechanical locking of the slidable sleeve 24 against movement axially of the cylinder [7 permits a rotational movement of the slidable sleeve relative to the cylinder 17 in a supported position on the ball bearings 37.
- the ball members 37 are movable out of a selected groove 38 and through an associated opening 36 by the release action of the tapered cam surface 33.
- the ball members 37 are thus supported within the openings 36 between the cam surface 33 and the outer peripheral surface of the cylinder 17 to provide for slidable movement of the sleeve 24 relative to the cylinder 17.
- the ball members 37 and grooves 38 thus constitute a coacting locking means that is actuated in response to a vertical reciprocal movement of the cam member 32 relative to the slidable sleeve 24.
- the cam supporting sleeve 3] is yieldably urged downwardly of the slidable sleeve 24 by a coil spring 39 mounted about the upper end of the slidable sleeve and arranged in compression between the top of the cam supporting sleeve 31 and the seat base plate 28.
- the spring 39 is enclosed within a retaining cup 41.
- the cam supporting sleeve 31 is moved upwardly to release the ball members 37 to their positions shown in FIG. 4 by means including an actuating lever 42 (FIGS. 2 and 3).
- the lever has a handle section 43, a central yoke or split section 44 and a fulcrum end section 46.
- the yoke section 44 is arranged about the upper end of the cam supporting sleeve 31 for pivotal connection thereto by a pair of diametrically opposite pivot pins 47.
- the fulcrum end section 46 is pivotally connected at 48 to the lower end of a leg member 49 that is secured to and depends from the seat base plate 28.
- the pivot connections 47 and 48 of the actuating lever 42 are relatively arranged such that when the ball members 37 are in their locking positions, shown in FIGS. 5 and 7, the actuating lever 42 is in a substantially horizontal position, shown in dotted lines in FIG. 2.
- the cam supporting sleeve 31 On an upward movement of the lever 42 from its dotted line position shown in FIG. 2 to its full line position shown in the same figure, the cam supporting sleeve 31 is moved upwardly relative to the slidable sleeve 24 against the action of the coil spring 39. As previously explained, this upward movement of the cam supporting sleeve 31 provides for the release of the ball members 37 to their positions shown in FIG. 4. In this release position of the ball members, the piston rod 22, slidable sleeve 24, cam supporting sleeve 31 and the seat structure 12, are all vertically movable as a unit relative to the cylinder 17 to provide for a location of the ball members 37 opposite a selected one of the grooves 38.
- valve plate 51 In adjusting the seat 29, the stool operator is seated and the vertical downward movement of the seat to an adjusted position takes place at a relatively slow rate of speed.
- the lower end 18 of the cylinder 17 is closed by a valve plate or end cover 51 (FIG. 5) which is threadably secured thereto.
- the valve plate 51 is formed with axially offset orifice 52 for fluid connecting the reservoir chamber 19 with a cylinder chamber 53 defined by the piston member 21 and valve plate 51.
- a one-way valve unit 54 in the valve plate 51 comprises an axially located opening 56 extended through the valve plate and a valve member 57 for such opening movable upwardly to an open position and downwardly to a seated position for closing the opening 56. Opening and closing of the one-way valve unit 54 takes place in response to a variation of the fluid pressure in the cylinder chamber 53 relative to the fluid pressure in the reservoir chamber 19.
- the fluid in the reservoir chamber 19 is maintained under pressure by means including a disk-like piston 58 movably mounted about the lower end 18 of the cylinder 17 in a fluid sealed engagement with the outer peripheral surface of the cylinder section 18 and the side wall of the chamber 19.
- the piston 58 is continuously urged in a downward direction by a plurality of coil springs 59 located about the cylinder lower end 18 and arranged in compression between the piston 58 and the top wall of the chamber 19 so as to apply, through the piston 58, a continuous pressure on the fluid in the chamber 19.
- the stool operator removes his weight from the seat structure 12 prior to an actuation of the lever 42 to its full line position in FIG. 2 to release the ball members 37 from the cylinder 17.
- the piston 58 is moved downwardly by the action of the spring 59 to force fluid upwardly into the cylinder chamber 53, by virtue of the now reduced fluid pressure in the chamber 53.
- the oneway valve unit 54 is opened to its position shown in FIGS. 7 and 8 to give the piston 21 an accelerated upward movement relative to the downward movement thereof to an adjusted position.
- This faster rate of upward movement of the piston rod 22 is due to the up ward flow of oil through both the opening 56 and orifice 52, and the larger cross sectional area of the opening 56 relative to the cross sectional area of the orifice 52.
- the stool operator When the piston rod 22, and, in turn, the seat structure 12 has been elevated to a position higher than a desired adjusted position, the stool operator merely applies his weight on the seat structure and adjusts the seat to a desired position in the manner previously described.
- Adjustment of the seat may thus be made in any one of the grooves 38 shown in FIG. 5, with the uppermost elevated position of the seat structure being shown in FIG. 7 and the lowermost adjusted position in FIG. 5.
- the rod bearing 62 is engageable with a plug member 63 provided in the upper end of the slidable sleeve 24.
- the actuating lever 42 is located substantially within the confines of the seat structure 12 and adjacent the underside thereof so as to be conveniently accessible to the stool operator.
- a dental stool including a base assembly, and a seat structure:
- a. means supporting the seat structure for adjustable vertical movement relative to said base assembly including an upright cylinder rigidly mounted on said base assembly centrally thereof,
- means for releasing and actuating said coacting locking means including a manually operated lever pivotally supported on said seat structure,
- h. means for controlling the rate of fluid flow to and from said cylinder to vary the rate of retraction of said piston relative to the rate of extension thereof so that when the coacting locking means is released the seat structure with a person seated thereon is movable downwardly at a slower rate than the upward rate of movement thereof without a person seated thereon.
- said movable means comprises a slidable cylindrical sleeve member having a side wall, and
- said coacting locking means includes a locking member mounted in said side wall for lateral movement to a first position projected inwardly of said inner peripheral surface and to a second position located outwardly of said inner peripheral surface,
- said locking member being movable to said first position therefor in response to an actuation of said coacting locking means by said lever.
- said locking member constitutes a ball member having a diameter greater than the thickness of the side wall of said slidable sleeve member
- the means for releasing and actuating the coacting locking means includes an annular cam member mounted about said slidable sleeve member having a cam surface engageable with the ball member, and
- a dental stool according to claim 3 including:
- a spring means mounted in compression between said cam member and said seat structure for continuously yieldably urging said cam member in said opposite direction.
- said source of fluid under pressure includes a fluid reservoir arranged centrally of said base assembly, and said cylinder has a lower end section projected downwardly within said fluid reservoir,
- said control means including a valve plate mounted in a closing relation with the lower end of said cylinder to form with said piston an expansible chamber within said cylinder,
- valve plate having an orifice extended therethrough to fluid connect said reservoir with said expansible chamber
- valve plate d. a one way valve unit in said valve plate providing for a uni-directional flow of fluid from said reservoir into said expansible chamber, said orifice having a cross-sectional area less than the crosssectional area of said valve unit.
Abstract
Description
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US386602A US3865341A (en) | 1973-08-08 | 1973-08-08 | Dental stool for dentist and dental assistant |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US386602A US3865341A (en) | 1973-08-08 | 1973-08-08 | Dental stool for dentist and dental assistant |
Publications (1)
Publication Number | Publication Date |
---|---|
US3865341A true US3865341A (en) | 1975-02-11 |
Family
ID=23526286
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US386602A Expired - Lifetime US3865341A (en) | 1973-08-08 | 1973-08-08 | Dental stool for dentist and dental assistant |
Country Status (1)
Country | Link |
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US (1) | US3865341A (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3990668A (en) * | 1976-01-15 | 1976-11-09 | Deere & Company | Hydraulic suspension seat assembly |
US3999733A (en) * | 1975-02-18 | 1976-12-28 | Coach & Car Equipment Corporation | Adjustable vehicle seat |
US4074887A (en) * | 1976-09-20 | 1978-02-21 | Hale Dean H | Power unit for a medical or like stool |
US4076201A (en) * | 1977-02-10 | 1978-02-28 | Hudnall Walter E | Adjustable chair-spindle assembly |
US4318526A (en) * | 1978-09-13 | 1982-03-09 | Werner Per G | Adjustable telescopic device |
US4488426A (en) * | 1980-08-14 | 1984-12-18 | The National Machinery Company | Forging machine for producing rivets or the like having running adjustments |
EP0183360A1 (en) * | 1984-11-05 | 1986-06-04 | Kimball International Inc. | Hydraulic chair lift mechanism |
WO1989008417A1 (en) * | 1986-09-08 | 1989-09-21 | Bengt Petersson | An arrangement for stepless vertical adjustment of a chair seat |
US4997150A (en) * | 1987-04-17 | 1991-03-05 | Lifter S.R.L. | Adjustable oleopneumatic support |
US5458305A (en) * | 1993-05-17 | 1995-10-17 | Woodward; John | Portable intravenous support stand |
US6272853B1 (en) * | 1996-03-15 | 2001-08-14 | Ole Flemming Broechmann | Hydraulic lifting-lowering-system for a working table, a couch or lying furniture or another heavy object |
US6616133B1 (en) * | 2001-07-18 | 2003-09-09 | Norgren Automotive, Inc. | Linear actuator having an adjustable piston rod |
US20080190696A1 (en) * | 2004-08-16 | 2008-08-14 | Flat Pty Ltd | Support for Supporting a Structure on a Surface |
GB2474505A (en) * | 2009-10-17 | 2011-04-20 | David Christopher Manifold | An adjustable leg for furniture |
US20120319444A1 (en) * | 2011-06-14 | 2012-12-20 | Paul Onopa | Sitting and Standing Chair |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2705119A (en) * | 1949-12-06 | 1955-03-29 | Ridge Tool Co | Pipe support stand |
US2851126A (en) * | 1956-08-01 | 1958-09-09 | Jr Frank R Ward | Spring yieldable adjustable support |
US3381926A (en) * | 1966-10-20 | 1968-05-07 | Edward E. Fritz | Adjustable stool |
US3547394A (en) * | 1969-01-14 | 1970-12-15 | Cramer Ind Inc | Height adjustment apparatus |
US3560033A (en) * | 1969-02-25 | 1971-02-02 | Homer A Barkus | Telescopic positive lock strut |
-
1973
- 1973-08-08 US US386602A patent/US3865341A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2705119A (en) * | 1949-12-06 | 1955-03-29 | Ridge Tool Co | Pipe support stand |
US2851126A (en) * | 1956-08-01 | 1958-09-09 | Jr Frank R Ward | Spring yieldable adjustable support |
US3381926A (en) * | 1966-10-20 | 1968-05-07 | Edward E. Fritz | Adjustable stool |
US3547394A (en) * | 1969-01-14 | 1970-12-15 | Cramer Ind Inc | Height adjustment apparatus |
US3560033A (en) * | 1969-02-25 | 1971-02-02 | Homer A Barkus | Telescopic positive lock strut |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3999733A (en) * | 1975-02-18 | 1976-12-28 | Coach & Car Equipment Corporation | Adjustable vehicle seat |
US3990668A (en) * | 1976-01-15 | 1976-11-09 | Deere & Company | Hydraulic suspension seat assembly |
US4074887A (en) * | 1976-09-20 | 1978-02-21 | Hale Dean H | Power unit for a medical or like stool |
US4076201A (en) * | 1977-02-10 | 1978-02-28 | Hudnall Walter E | Adjustable chair-spindle assembly |
US4318526A (en) * | 1978-09-13 | 1982-03-09 | Werner Per G | Adjustable telescopic device |
US4488426A (en) * | 1980-08-14 | 1984-12-18 | The National Machinery Company | Forging machine for producing rivets or the like having running adjustments |
EP0183360A1 (en) * | 1984-11-05 | 1986-06-04 | Kimball International Inc. | Hydraulic chair lift mechanism |
WO1989008417A1 (en) * | 1986-09-08 | 1989-09-21 | Bengt Petersson | An arrangement for stepless vertical adjustment of a chair seat |
US4997150A (en) * | 1987-04-17 | 1991-03-05 | Lifter S.R.L. | Adjustable oleopneumatic support |
US5458305A (en) * | 1993-05-17 | 1995-10-17 | Woodward; John | Portable intravenous support stand |
US6272853B1 (en) * | 1996-03-15 | 2001-08-14 | Ole Flemming Broechmann | Hydraulic lifting-lowering-system for a working table, a couch or lying furniture or another heavy object |
US6616133B1 (en) * | 2001-07-18 | 2003-09-09 | Norgren Automotive, Inc. | Linear actuator having an adjustable piston rod |
US20080190696A1 (en) * | 2004-08-16 | 2008-08-14 | Flat Pty Ltd | Support for Supporting a Structure on a Surface |
US8302743B2 (en) * | 2004-08-16 | 2012-11-06 | Flat Pty Ltd | Support for supporting a structure on a surface |
US9004239B2 (en) | 2004-08-16 | 2015-04-14 | Flat Pty Ltd | Support for supporting a structure on a surface |
US9909709B2 (en) | 2004-08-16 | 2018-03-06 | Flat Pty Ltd | Support for supporting a structure on a surface |
GB2474505A (en) * | 2009-10-17 | 2011-04-20 | David Christopher Manifold | An adjustable leg for furniture |
GB2474505B (en) * | 2009-10-17 | 2011-10-26 | David Christopher Manifold | A leg for furniture |
US20120319444A1 (en) * | 2011-06-14 | 2012-12-20 | Paul Onopa | Sitting and Standing Chair |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: DEN-TAL-EZ DENTAL PRODUCTS CORP., 1900 RITTENHOUSE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SYNTEX (U.S.A.) INC.;REEL/FRAME:004671/0857 Effective date: 19861010 Owner name: DEN-TAL-EZ DENTAL PRODUCTS CORP., A CORP. OF PA.,P Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SYNTEX (U.S.A.) INC.;REEL/FRAME:004671/0857 Effective date: 19861010 |
|
AS | Assignment |
Owner name: MERIDIAN BANK, 5 PENN CENTER PLAZA, PHILADELPHIA, Free format text: SECURITY INTEREST;ASSIGNOR:DEN-TAL-EZ DENTAL PRODUCTS CORP.;REEL/FRAME:004826/0156 Effective date: 19861020 Owner name: DEN-TAL-EZ, INC. Free format text: SECURITY INTEREST;ASSIGNOR:DEN-TAL-EZ DENTAL PRODUCTS CORP.;REEL/FRAME:004826/0171 Effective date: 19861020 Owner name: MERIDIAN BANK,PENNSYLVANIA Free format text: SECURITY INTEREST;ASSIGNOR:DEN-TAL-EZ DENTAL PRODUCTS CORP.;REEL/FRAME:004826/0156 Effective date: 19861020 |
|
AS | Assignment |
Owner name: DENTAL-EZ, INC., PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST AS OF JANUARY 26, 1990;ASSIGNORS:DOMINION BANK OF MARYLAND, N.A.;JEFFERSON BANK;DOMINION BANK, N.A.;REEL/FRAME:005919/0959;SIGNING DATES FROM 19910429 TO 19911112 |