US3820844A - Step attachment for a dental stool - Google Patents

Step attachment for a dental stool Download PDF

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Publication number
US3820844A
US3820844A US35576473A US3820844A US 3820844 A US3820844 A US 3820844A US 35576473 A US35576473 A US 35576473A US 3820844 A US3820844 A US 3820844A
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Grant
Patent type
Prior art keywords
plate
floor
stool
plate member
base
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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Inventor
G Fortnam
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DENTAL-EZ Inc
DEN TAL EZ Mfg Co
Original Assignee
DEN TAL EZ Mfg Co
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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C7/00Parts, details, or accessories of chairs or stools
    • A47C7/50Supports for the feet or the legs coupled to fixed parts of the chair
    • A47C7/506Supports for the feet or the legs coupled to fixed parts of the chair of adjustable type
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C7/00Parts, details, or accessories of chairs or stools
    • A47C7/50Supports for the feet or the legs coupled to fixed parts of the chair
    • A47C7/52Supports for the feet or the legs coupled to fixed parts of the chair of detachable type
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/60Supports for surgeons, e.g. chairs or hand supports

Abstract

The step attachment comprises a plate member adapted to extend radially from the center post of a dental stool in an overlying relation with the stool base, which carries floor engaging caster wheels. The plate member is movably supported at the lower end of the post for rotational movement about the post and for pivotal up and down movement of its outer end. A leg member at the outer end of the plate member is normally yieldably held out of engagement with the floor whereby the stool is freely movable along the floor and the plate member fully rotatable about the post. When the plate member is stepped on the leg member is moved into bearing engagement with the floor to hold the stool against floor movement.

Description

United States Patent 1191 F ortnam '[4 June 28, 1974 [75] Inventor: George A. Fortnam, Des Moines,

Iowa

[73] Assignee: Den-Tal-Ez Mfg. Co., West Des Moines, Iowa 221 Filed: Apr. 30, 1973 211 Appl. No.: 355,764

l/l96l MacKnight 297/240 Primary ExaminerCasmir A. Nunberg Attorney, Agent, or Firm-Rudolph L. Lowell [57] ABSTRACT The step attachment comprises a plate member adapted to extend radially from the center post of a dental stool in an overlying relation with the stool base, which carries floor engaging caster wheels. The plate member is movably supported at the lower end of the post for rotational movement about the post and for pivotal up and down movement of its outer end. A leg member at the outer end of the plate member is normally yieldably held out of engagement with the floor whereby the stool is freely movable along the floor and the plate member fully rotatable about the post. When the plate member is stepped on the leg member is moved into bearing engagement with the floor to hold the stool against floor movement.

4 Claims, 6 Drawing Figures SUMMARY OF THE INVENTION The step attachment is of a simple construction and efficient in operation to provide a convenient stool step down for a dental assistant concurrently with a locking or braking of the stool against floor movement. Slipping of the stool outwardly from under the dental assistant when demounting from, or mounting, the stool and resultant possible injury is thus positively prevented. Additionally, when the stool is in use the assistant need only rest the feet on the step to lock the chair on the floor against free wheeling. The attachment is readily adaptable to many type dental stools now in use.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a dental stool showing the step attachment in assembly relation therewith;

FIG. 2 is an enlarged partial sectional view taken on line 22 in FIG. 1;

FIG. 3 is a sectional view on line 33 inv FIG. 2;

FIG. 4 is an enlarged sectional detail view as seen on line 44 in FIG. 3;

FIG. 5 is an enlarged sectional detail view on line 5-5 in FIG. 4; and I FIG. 6 is an exploded perspective view of a ring assembly which movably supports the step attachment for horizontal rotational movement and for pivotal up and down movement relative to the center post of the stool.

DETAILED DESCRIPTION OF THE INVENTION Referring to the drawing, there is shown in FIG. 1 a usual type stool 10 for a dental assistant. The stool includes a base 11 for an upright center post or standard 12 which carries at its upper end a seat unit 13 equipped wth a back rest 14. The base (FIGS. 1 and 2) includes a central hub section 16 from which radially extends a series of feet members 17, illustrated as four in number, arranged indiametrically opposed pairs. Supported from the free or outer end of each foot member 17 is a floor engageable caster wheel 18. A foot rest 19 for the dental assistant or stool user is of a ring shape positioned concentrically relative to the hub section 16 and secured to the upper surface of the feet members 17 adjacent the free ends thereof.

The central hub section 16 is of cylindrical tubular shape and constitutes a lower end section for the center post 12. The post has an upper end section 22 of a rod form that is telescopically received within the post lower section 16. An adjusted moved position of the upper post section 22 is maintained by a usual friction or clamping screw23 which is threadable within the lower post section 16 and into engagement with the upper post section 22.

The step attachment of this invention, generally indicated at 24, (FIGS. 2 and 3) includes a flat step or plate member 26 which extends radially outwardly from the center post 12 in a substantially horizontal position overlying the base 11. The plate member 26 is of a generally rectangular shape and is formed with an inner end section 27which terminates in a central longitudinal extension having a semicircular notch 28 to form a pair of transversely spaced arm members 29 (FIGS. 2 and 4) positioned in a straddling relation with the lower end section 16 of the center post 12. The free ends of the arms have horizontally extended axially aligned tapped holes 30. The outer end section 31 of the plate member 26 projects outwardly from the base 11 for a purpose to appear later.

The plate member 26 is movably supported for rotational movement relative to the vertical axis of the center post 12 and for up and down pivotal movement of its outer end 31 about a horizontal axis extended through the holes 30 of the spaced arm member 29. These movements of the plate member 26 are accomplished by the provision of a ring assembly, indicated generally as 32, (FIGS. 4 and 6) which includes a mounting ring 33 and a rotatable ring 34. The mounting ring 33 is of a split type having the half sections thereof connected together by connecting screws 36. The assembled mounting ring 33 is rigidly secured about the lower post section 16 by clamping screws 37 threadable radially of the ring 33 and into engagement with the outer peripheral surface of the center post section 16.

The outer peripheral surface of the mounting ring 33 is formed with a circumferential groove 38 of a size to rotatably receive therein the rotatable ring34. Similarly to the mounting ring 33, the rotatable ring 34 is of a split type so as to provide half sections 39, each of which is formed with a radially extended hole 41 located centrally between the ends thereof. With the ring half sections 39 positioned within the groove 38 the spaced arms 29, at the inner end 27 of the plate member 26, are arranged at opposite sides of the central post 12 to a position wherein the holes 30 at the free ends thereof are in axial alignment with the holes 41 in the'rotatable ring 34. Pivot pins 42, commonly known as half dog point set screws are threadable within the arm holes 30 (FIGS. 3 and 5) for extension of their shank sections 43 within theholes 41 of the rotatable ring 34. By virtue of this assembly, the half sections 39 of the rotatable ring 34 are maintained against separation concurrently with pivotally supportingthe plate member 26 on the pivot pins 42. It will be noted also that the semicircular notch 28 provides a working clearance of the step member with the post section 16 during up and down pivotal movement thereof. Plastic spacers 44 (FIG. 4) secured to the end faces of a halfsection 39 of the rotatable ring 34 compensates for the material cut away in the forming of such sections.

The plate member 26 is yieldably urged to an upper pivotally moved position, indicated in dotted lines in FIG. 3, by means of a Hat spring 45 having one end 46 secured to the underside of' the inner end 27 of the plate member and its other end 47 resting in slidable contact engagement on the top surface of the ring shape foot rest 19. In this upper pivotally moved position of the plate member a pair of leg members 48 projected downwardly from its outer end 31 at a position outwardly from the base 11 are elevated so as to be in a clearance relation with a floor surface indicated at 49. In the upper pivotally moved position, therefore, the plate member 26 is freely rotatable about the vertical axis of the central post 12 in a supported position on the foot rest 19. I-Iowevenwhen pressure is applied downwardly on the plate member, as occurs when it is stepped on by a person to be seated on or leaving the stool, the lower ends of the legs 48 are moved downwardly against the pressure of the spring 45 into bearing engagement with the floor 49, as shown in full lines in FIG. 3. The stool 10 is thus locked against free wheeling movement on the caster wheels 18. In this re- 3 spect it is to be noted that a Similar locking action is obtained when the stool user is seated withthe feet supported on theplate member 26. g

It is seen, therefore, that the stool l is'locked against free floor movementwhen in use, and during the seating and unseating of a person such as a dental assistant. As a result, any injury or damage that may result by the tendency of the stool being pushed away by a person in mounting on or demounting from the stool is corripletely eliminated. Likewise, any accidental floor movement of the stool when in use is also eliminated.

Although the'invention has been described with respect to a preferred embodiment thereof, it is to be understood that it is not to be so limited since changes and modifications can be made therein which are within the full intended scope .of this invention as defined by the appended claims.

I claim:

1. A step attachment for a dental stool having a vertical standard mounted on a base provided with floor engaging caster wheels; said attachment comprising:

a. a substantially horizontal plate overlying said base having an inner end portion adjacent said vertical standard, and an outer end wardly from said base,

b. a floor engaging leg means secured to and projected downwardly from said outer plate portion, 0. means movably supporting the inner. end of said plate member on said vertical standard for rotational movement of the plate about the vertical axis of said standard, and for up and down pivotal movementof said outer portion about a horizontal axis extended transversely 'of said vertical axis, and d. coacting means on said base-and on said plate for yieldably urging said plate to' an upper pivotally portion projected outmoved position wherein said leg means are in a clearance relation with the floor, 1 I e. saidleg means,'when said plate is stepped upon, being movable into bearing engagementwith the floor surface to rigidly support-the plateagainst downward pivotalmovement and to lock-v said stool against floor movement. i I 2. The step down attachment for a dental stool according to claim l wherein:

a. said base includes a plurality of feet members extended radially from said vertical standard, and I b. said coacting means includes a ring member con centric with said vertical-axis-supported on and secured to the upper surfaces of saidfeet members, and i I c. a spring member secured to the under side of said plate in slidable contact. engagement with the upper surface of said ring member.

3. The step down attachment for a dental stool according to claim 1 wherein:

a. said supporting means includes a rotatable ring member positioned about the lower end of said standard and rotatable about said vertical axis, b. a pair of transversely spaced arm members projected longitudinally outwardly from the inner end portion of said plate to opposite sides of said rotatable ring, and

-c. pivot means pivotally connecting said arm members on said rotatable ring at positions equidistant from said vertical axis to provide for the pivotal movement of said plate about said horizontal axis.

4. The step down attachment for adental stool according to claim2 wherein: 1

a. said leg means includes a pairof leg members spaced transversely of said plate member.

Claims (4)

1. A step attachment for a dental stool having a vertical standard mounted on a base provided with floor engaging caster wheels; said attachment comprising: a. a substantially horizontal plate overlying said base having an inner end portion adjacent said vertical standard, and an outer end portion projected outwardly from said base, b. a floor engaging leg means secured to and projected downwardly from said outer plate portion, c. means movably supporting the inner end of said plate member on said vertical standard for rotational movement of the plate about the vertical axis of said standard, and for up and down pivotal movement of said outer portion about a horizontal axis extended transversely of said vertical axis, and d. coacting means on said base and on said plate for yieldably urging said plate to an upper pivotally moved position wherein said leg means are in a clearance relation with the floor, e. said leg means, when said plate is stepped upon, being movable into bearing engagement with the floor surface to rigidly support the plate against downward pivotal movement and to lock said stool against floor movement.
2. The step down attachment for a dental stool according to claim 1 wherein: a. said base includes a plurality of feet members extended radially from said vertical standard, and b. said coacting means includes a ring member concentric with said vertical axis supported on and secured to the upper surfaces of said feet members, and c. a spring member secured to the under side of said plate in slidable contact engagement with the upper surface of said ring member.
3. The step down attachment for a dental stool according to claim 1 wherein: a. said supporting means includes a rotatable ring member positioned about the lower end of said standard and rotatable about said vertical axis, b. a pair of transversely spaced arm members projected longitudinally outwardly from the inner end portion of said plate to opposite sides of said rotatable ring, and c. pivot means pivotally connecting said arm members on said rotatable ring at positions equidistant from said vertical axis to provide for the pivotal movement of said plate about said horizontal axis.
4. The step down attachment for a dental stool according to claim 2 wherein: a. said leg means includes a pair of leg members spaced transversely of said plate member.
US3820844A 1973-04-30 1973-04-30 Step attachment for a dental stool Expired - Lifetime US3820844A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US3820844A US3820844A (en) 1973-04-30 1973-04-30 Step attachment for a dental stool

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US3820844A US3820844A (en) 1973-04-30 1973-04-30 Step attachment for a dental stool
JP4705474A JPS5323738B2 (en) 1973-04-30 1974-04-25
IT5062274A IT1011282B (en) 1973-04-30 1974-04-26 A dental chair Accessory
DE19742421062 DE2421062A1 (en) 1973-04-30 1974-04-29 Stage approach for a dentist chair
BR348474A BR7403484D0 (en) 1973-04-30 1974-04-29 stair accessory assist for revolving bank for dentists

Publications (1)

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US3820844A true US3820844A (en) 1974-06-28

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US3820844A Expired - Lifetime US3820844A (en) 1973-04-30 1973-04-30 Step attachment for a dental stool

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US (1) US3820844A (en)
JP (1) JPS5323738B2 (en)
DE (1) DE2421062A1 (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2577402A1 (en) * 1985-02-18 1986-08-22 Mengshoel Hans Chr Device designed to be used by a person in a position both sitting and kneeling
US4832407A (en) * 1987-11-27 1989-05-23 Hector Serber Variable posture chair and method
US4995670A (en) * 1988-08-05 1991-02-26 Rodas Wilson A Hairdresser foot rest
US5174631A (en) * 1991-10-04 1992-12-29 Schaevitz Lester P Footrest and stabilizer
US5255957A (en) * 1988-12-13 1993-10-26 Peter Opsvik Arrangement in a chair, for example a combined chair
WO1998008424A1 (en) * 1996-08-26 1998-03-05 Barry James Dixon Chair
WO2002087390A1 (en) * 2001-05-01 2002-11-07 Porpetoum Mobille Ltd. A chair
US20050225150A1 (en) * 2004-04-08 2005-10-13 Caroline Saulnier Ergonomic seating assembly
US20050253441A1 (en) * 2004-04-29 2005-11-17 Neutral Posture, Inc. Support assembly for a seating device
US20070284194A1 (en) * 2004-03-02 2007-12-13 Woodhams Max D Stairlifts
US20080157572A1 (en) * 2006-12-27 2008-07-03 Kwan-Young Jung Foot supporting apparatus of a chair
US20100066148A1 (en) * 2008-09-15 2010-03-18 Matthews John P Ergonomic desk system and chair
US20100201177A1 (en) * 2009-02-11 2010-08-12 Moore Curtis E Adjustable footrest for stool or pedestal chair
US20120125237A1 (en) * 2010-11-18 2012-05-24 Johan Heyvaerts Table with height-adjustable component
DE202013008612U1 (en) 2013-09-27 2013-10-16 Peter Peters Footrest for a chair
US20150028646A1 (en) * 2013-07-23 2015-01-29 La-Z-Boy Incorporated Furniture member with center support leg rest
US20150107939A1 (en) * 2012-05-10 2015-04-23 Otto Ooms B.V. Stair Lift
US9578969B1 (en) * 2015-09-04 2017-02-28 Dongguan Kentec Office Seating Co., Ltd. Adjustable footrest ring for chair
US20170105534A1 (en) * 2015-09-04 2017-04-20 Chih-Cheng Su Fastening structure for footrest ring of chair
US9642465B1 (en) * 2016-07-28 2017-05-09 Bright Company Inc. Foot and leg support device for a chair
GB2561415A (en) * 2017-08-22 2018-10-17 Abolkheir Mohamed Office ergonomic system
WO2018195248A1 (en) * 2017-04-21 2018-10-25 Johnson & Johnson Surgical Vision, Inc. Apparatus, system and method of providing a foot pedal platform for ophthalmic surgery

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3024920C2 (en) * 1980-07-01 1990-02-22 Drabert Soehne Minden (Westf.), 4950 Minden, De
US4753407A (en) * 1987-04-24 1988-06-28 Brock Robert L Riser assembly for hairdressing chair
US6149239A (en) * 1998-11-05 2000-11-21 Markussen; Brad D. Foot support for chair or stool
JP4827520B2 (en) 2005-12-21 2011-11-30 出光興産株式会社 Resin pellet storage apparatus and method cleaning

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2577402A1 (en) * 1985-02-18 1986-08-22 Mengshoel Hans Chr Device designed to be used by a person in a position both sitting and kneeling
US4832407A (en) * 1987-11-27 1989-05-23 Hector Serber Variable posture chair and method
US4995670A (en) * 1988-08-05 1991-02-26 Rodas Wilson A Hairdresser foot rest
US5255957A (en) * 1988-12-13 1993-10-26 Peter Opsvik Arrangement in a chair, for example a combined chair
DE3991487C1 (en) * 1988-12-13 1994-04-21 Peter Opsvik chair
US5174631A (en) * 1991-10-04 1992-12-29 Schaevitz Lester P Footrest and stabilizer
WO1998008424A1 (en) * 1996-08-26 1998-03-05 Barry James Dixon Chair
WO2002087390A1 (en) * 2001-05-01 2002-11-07 Porpetoum Mobille Ltd. A chair
US20070284194A1 (en) * 2004-03-02 2007-12-13 Woodhams Max D Stairlifts
US20050225150A1 (en) * 2004-04-08 2005-10-13 Caroline Saulnier Ergonomic seating assembly
US7070241B2 (en) * 2004-04-08 2006-07-04 Caroline Saulnier Ergonomic seating assembly
US20050253441A1 (en) * 2004-04-29 2005-11-17 Neutral Posture, Inc. Support assembly for a seating device
US7036886B2 (en) * 2004-04-29 2006-05-02 Neutral Posture, Inc. Support assembly for a seating device
US20080157572A1 (en) * 2006-12-27 2008-07-03 Kwan-Young Jung Foot supporting apparatus of a chair
US7452034B2 (en) * 2006-12-27 2008-11-18 Duoback Korea Co., Ltd. Foot supporting apparatus of a chair
US8297706B2 (en) 2008-09-15 2012-10-30 Matthews John P Ergonomic chair
US20100066148A1 (en) * 2008-09-15 2010-03-18 Matthews John P Ergonomic desk system and chair
US8246118B2 (en) 2009-02-11 2012-08-21 Moore Curtis E Adjustable footrest for stool or pedestal chair
US20100201177A1 (en) * 2009-02-11 2010-08-12 Moore Curtis E Adjustable footrest for stool or pedestal chair
US20120125237A1 (en) * 2010-11-18 2012-05-24 Johan Heyvaerts Table with height-adjustable component
US20150107939A1 (en) * 2012-05-10 2015-04-23 Otto Ooms B.V. Stair Lift
US9731940B2 (en) * 2012-05-10 2017-08-15 Otto Ooms B.V. Stair lift
US20150028646A1 (en) * 2013-07-23 2015-01-29 La-Z-Boy Incorporated Furniture member with center support leg rest
US9101221B2 (en) * 2013-07-23 2015-08-11 La-Z-Boy Incorporated Furniture member with center support leg rest
DE202013008612U1 (en) 2013-09-27 2013-10-16 Peter Peters Footrest for a chair
DE102013016136A1 (en) 2013-09-27 2015-04-02 Peter Peters Footrest for a chair
US9578969B1 (en) * 2015-09-04 2017-02-28 Dongguan Kentec Office Seating Co., Ltd. Adjustable footrest ring for chair
US20170105534A1 (en) * 2015-09-04 2017-04-20 Chih-Cheng Su Fastening structure for footrest ring of chair
US9706849B2 (en) * 2015-09-04 2017-07-18 Dongguan Kentec Office Seating Co., Ltd. Fastening structure for footrest ring of chair
US9642465B1 (en) * 2016-07-28 2017-05-09 Bright Company Inc. Foot and leg support device for a chair
WO2018195248A1 (en) * 2017-04-21 2018-10-25 Johnson & Johnson Surgical Vision, Inc. Apparatus, system and method of providing a foot pedal platform for ophthalmic surgery
GB2561415A (en) * 2017-08-22 2018-10-17 Abolkheir Mohamed Office ergonomic system

Also Published As

Publication number Publication date Type
DE2421062A1 (en) 1974-11-14 application
JPS5041661A (en) 1975-04-16 application
JPS5323738B2 (en) 1978-07-17 grant

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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