EP0331122A2 - Gelenkartiger Mechanismus für Kopfstütze - Google Patents

Gelenkartiger Mechanismus für Kopfstütze Download PDF

Info

Publication number: EP0331122A2
Authority: EP; European Patent Office
Prior art keywords: bar; headrest; support means; cam; proximate
Prior art date: 1988-03-04
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.): Granted

Application number

EP89103517A

Other languages

English (en)

French (fr)

Other versions

EP0331122A3 (en

EP0331122B1 (de

Inventor

Hugh-James Mccrackin

Dennis Frank Leffler

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Siemens AG

Siemens Corp

Original Assignee

Siemens AG

Siemens Corp

Priority date (The priority date 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 date listed.)

1988-03-04

Filing date

1989-02-28

Publication date

1989-09-06

1988-12-15 Priority claimed from US07/285,185 external-priority patent/US4848838A/en

1989-01-12 Priority claimed from US07/296,915 external-priority patent/US4863218A/en

1989-02-28 Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG

1989-09-06 Publication of EP0331122A2 publication Critical patent/EP0331122A2/de

1989-12-13 Publication of EP0331122A3 publication Critical patent/EP0331122A3/en

1993-08-04 Application granted granted Critical

1993-08-04 Publication of EP0331122B1 publication Critical patent/EP0331122B1/de

2009-02-28 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Images

Classifications

- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G15/00—Operating chairs; Dental chairs; Accessories specially adapted therefor, e.g. work stands
- A61G15/10—Parts, details or accessories
- A61G15/12—Rests specially adapted therefor, e.g. for the head or feet
- A61G15/125—Head-rests

Definitions

This invention relates to an articulated headrest for a treatment chair, and more particularly to a mechanism for controlling the tilting angle of the headrest of a dental treatment chair.
Figure 1(A) indicates one type of prior art headrest mechanism for a dental chair
a headrest 2 includes a pad 4 fixedly attached to one end of a support bar 6, the other end of bar 6 being pivotably attached to the backrest 8 of the treatment chair via a coupling 10.
the locus of rotation A of headrest 2 has a center of rotation C centered at coupling 10 while the locus of rotation B of the head H of a patient P has a center of rotation C′ corresponding with the cervical vertebrae of the patient P when positioned in the treatment chair.
head H Since the center of rotation for headrest 2 does not match the center of rotation for head H, head H will physically slip out of position on pad 4 during adjustment of the tilt of headrest 2. This results in patient discomfort and a necessary repositioning of the posture of patient P.
Figures 1(B) indicates another prior art headrest arrangement, such as known for example by U.S. Patent 4,515,406, wherein the headrest mechanism 12 includes a pad l4 fixedly attached to a straight portion 16 of a generally curved support bar 18.
the curved portion of support bar 18 rides between rollers 20 located within the backrest 22 of the dental chair and is thereby adjustable along the length of support bar 18 for controlling the tilting of the head H of the patient P.
a locking ratchet arrangement 24 is included within backrest 22 and engages support bar 18 for locking it into a desired position.
the locus of rotation A of headrest pad 14 has a center of rotation C ⁇ which is also the center of rotation of the head H of the patient P.
An object fo the present invention is to provide an adjustable headrest for a treatment chair which is comfortable for the patient both during and after a readjustment of the tilting of the patient's head and which improves the ability of the headrest to be lowered toward the lap of the dentist.
a further object of the invention is to provide a headrest mechanism which can easily be adjusted to a minor range of tilting angle which is separated from a main range of tilting angles.
a mechanism which moves that portion of the headrest which defines its locus of rotation from the top of the backrest, to a position located lower in the backrest.
a bar is provided having first and second ends, with a headrest mounting portion proximate the first end.
a support means includes a curved cam surface and a guides means. The guides means slideably engages a portion of the bar which is intermediate the first and second ends so as to allow the bar to be slideable with respect to the support means.
a cam following means attached to the bar proximate the second end causes the second end to follow the cam surface of the support means.
FIGS 2 and 3 illustrate perspective and section views, respectively, of a preferred embodiment of the headrest mechanism in a dental treatment chair.
the backrest portion 2 of the treatment chair (not totally shown) is shown in phantom without details of support, cushioning, etc., which details are not necessary for understanding the present invention.
a headrest pad 4 is attached to one end of a sliding support bar 6 which extends out the top of backrest 2 and is slidable therein.
Support bar 6 has a curved portion wherein headrest pad 4 is attached and a substantially straight portion which extends into backrest 2.
a mounting plate 8 secured within backrest 2 includes a support means for slidably positioning the other end of support bar 6 at various ones of plurality of fixed positions.
the support means comprises cam plates 10 and 12 secured in a parallel facing relationship on mounting plate 8 and separated by a rotatable pin 14 having its ends captivated by a portion of cam plates 10 and 12 which is located toward head rest 4.
Pin 14 has a cross-slot l6 located therethrough, through which the substantially straight portion of support bar 6 is able to slide through.
cam plates 10 and 12 include curved cam surfaces 18 therein, which slidably receive the ends of a cam following pin 20.
Cam following pin 20 is secured near the end of support bar 6 which is opposite its headrest end.
a spring 22 associated with pin 20 urges a pawl 24 against a bar 26 having serrations therein which engage pawl 24 to form a ratchet locking mechanism 28 which locks the position of support bar 6 into any one of a plurality of positions defined by the serrations on bar 26.
a release cable (not shown) having an end attached to pawl 24 is accessable from the headrest end of backrest 2 for selectively releasing lock mechanism 28 from its present position and thereby allow repositioning of support bar 6.
support bar 6 slides through slot 16 in pin 14 as the position of headrest 4 is adjusted. Due to the confinement of the movement of the lower end of support bar 6 to a curved path defined by the action of cam following pin 20 along cam surfaces 18, headrest 4 moves in a curved path having a center of rotation R which is remote from the plane of mounting plate 8 and advantageously coincides with the center of rotation of the cervical vertebrae of a patient when disposed in the treatment chair.
adjustment of the tilting angle of head rest 4 coincides with the normal angular movement of the patients's head and such adjustment is thereby accomplished without a sliding of the patient's head with respect to headrest 4.
the curved surface which defines the tilting angle is located below the top of the chair back, thereby allowing the mechanical structure nearest the headrest to have a shape which will allow a maximum lowering of the patient's head towards the knees' of the dentist, thereby facilitating certain dental procedures.
the curvature of cam surfaces 18 is divided into at least two portions.
a first portion 30 comprises a uniformly shaped curved surface which controls a major portion of the movement of bar 18 and hence the tilting angle of headrest 4.
a second portion 32 located at at least one end of first portion 28, comprises a surface having a curvature which is substantially different from the curvature of first portion 28, for allowing a range, of tilting angles of headrest 4 which facilitates special dental procedures, such a those required during certain x-ray procedures.
Figure 4 illustrates a second embodiment of the invention wherein a sigmoidally shaped headrest support bar allows the degree of concavity of the cam following surface and the height of pin 14 to be reduced from that shown in the first embodiment, thereby even further reducing the thickness required for the headrest mechanism.
the components and operation of the Figure 4 embodiment are the same as described above with respect to Figures 2 and 3 (and accordingly use the same reference numerals, however, with a prime added) except that in Figure 4, the concavely curved cam surface 18′ have a lesser degree of concavity than the concavely curved cam surfaces 18 of Figures 2 and 3 and the height of pin 14′ is reduced.
support bar 6′ has a sigmoidal shape. More specifically, a first portion 32 of bar 6′ which is proximate headrest 4′ has a concavity which is oppositely directed from the direction of the concavity of cam surfaces 18′ (i.e., as shown in Figure 4, the concavity of cam surfaces 18′ is directed up while the concavity of portion 32 of bar 6′ is substantially directed down).
a second portion 34 of bar 6′ which is proximate cam follower 20′ has a concavity which is directed in substantially the same direction (up) as the concavity of cam surfaces 18′.
bar 6′ has oppositely directed concavities and an inflection point 36 therebetween.
the headrest tilting arrangement can be used in a treatment table, as well as in a treatment chair. All such changes, modifications, variations and other uses and applications which do not depart from the spirit and scope of the invention are deemed to be covered by the invention which is limited only by the following claims.

Landscapes

Health & Medical Sciences (AREA)
Oral & Maxillofacial Surgery (AREA)
Life Sciences & Earth Sciences (AREA)
Animal Behavior & Ethology (AREA)
General Health & Medical Sciences (AREA)
Public Health (AREA)
Veterinary Medicine (AREA)
Accommodation For Nursing Or Treatment Tables (AREA)

EP19890103517 1988-03-04 1989-02-28 Gelenkartiger Mechanismus für Kopfstütze Expired - Lifetime EP0331122B1 (de)

Applications Claiming Priority (8)

Application Number	Priority Date	Filing Date	Title
US164164		1980-06-30
US16416488A	1988-03-04	1988-03-04
US23396688A	1988-08-18	1988-08-18
US233966		1988-08-18
US07/285,185 US4848838A (en)	1988-08-18	1988-12-15	Curved articulating headrest support bar
US285185		1988-12-15
US296915		1989-01-12
US07/296,915 US4863218A (en)	1988-08-18	1989-01-12	Articulated headrest mechanism

Publications (3)

Publication Number	Publication Date
EP0331122A2 true EP0331122A2 (de)	1989-09-06
EP0331122A3 EP0331122A3 (en)	1989-12-13
EP0331122B1 EP0331122B1 (de)	1993-08-04

Family

ID=27496592

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP19890103517 Expired - Lifetime EP0331122B1 (de)	1988-03-04	1989-02-28	Gelenkartiger Mechanismus für Kopfstütze

Country Status (2)

Country	Link
EP (1)	EP0331122B1 (de)
DE (1)	DE68907951T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP1186257A2 (de) *	2000-09-06	2002-03-13	Sedus Stoll AG	Nackenstütze für einen Bürodrehstuhl
DE10253863B4 (de) *	2002-11-19	2008-07-10	Maquet Gmbh & Co. Kg	Motorisch verstellbare Kopfstütze

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE202011109649U1 (de)	2011-12-30	2012-03-14	Sirona Dental Systems Gmbh	Behandlungsstuhl mit einem Verstellsystem

Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2989341A (en) *	1958-12-08	1961-06-20	Anton Lorenz	Head-rest and control
US4515406A (en) *	1982-09-28	1985-05-07	Takara Company, New York, Inc.	Headrest for medical treatment chair
US4647108A (en) *	1980-04-14	1987-03-03	Kabushiki Kaisha Morita Seisakusho	Device for controlling headrest of treatment equipment

1989
- 1989-02-28 EP EP19890103517 patent/EP0331122B1/de not_active Expired - Lifetime
- 1989-02-28 DE DE1989607951 patent/DE68907951T2/de not_active Expired - Fee Related

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2989341A (en) *	1958-12-08	1961-06-20	Anton Lorenz	Head-rest and control
US4647108A (en) *	1980-04-14	1987-03-03	Kabushiki Kaisha Morita Seisakusho	Device for controlling headrest of treatment equipment
US4515406A (en) *	1982-09-28	1985-05-07	Takara Company, New York, Inc.	Headrest for medical treatment chair

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP1186257A2 (de) *	2000-09-06	2002-03-13	Sedus Stoll AG	Nackenstütze für einen Bürodrehstuhl
EP1186257A3 (de) *	2000-09-06	2002-05-08	Sedus Stoll AG	Nackenstütze für einen Bürodrehstuhl
DE10253863B4 (de) *	2002-11-19	2008-07-10	Maquet Gmbh & Co. Kg	Motorisch verstellbare Kopfstütze

Also Published As

Publication number	Publication date
EP0331122A3 (en)	1989-12-13
DE68907951D1 (de)	1993-09-09
EP0331122B1 (de)	1993-08-04
DE68907951T2 (de)	1993-12-16

Publication	Publication Date	Title
US4647108A (en)	1987-03-03	Device for controlling headrest of treatment equipment
US4863218A (en)	1989-09-05	Articulated headrest mechanism
US11857467B2 (en)	2024-01-02	Surgical table and method for use thereof
EP1647252B1 (de)	2007-12-05	Kopfstütze Halterung und Verstellmechanismus
EP0277145B1 (de)	1991-05-15	Einstellbare sitzanordnung
CA2616703C (en)	2014-04-15	Cervical collar with geared adjustment
US4848838A (en)	1989-07-18	Curved articulating headrest support bar
US4366985A (en)	1983-01-04	Adjustable headrest for treatment chair
US10046132B2 (en)	2018-08-14	Respiratory device comprising a fastening system
CA2482825C (en)	2011-03-15	Device and method for improving a user's breathing
EP1366714B1 (de)	2017-02-15	Klemmzusatzsystem für eine Patientenliege
EP2376049B1 (de)	2016-10-19	Rollstuhl
US6436126B1 (en)	2002-08-20	Head flexion mechanism for chiropractic table
US4819282A (en)	1989-04-11	Tilting mechanism for use with infant bassinette
KR101602945B1 (ko)	2016-03-21	자동 높이 조절 베개
US4724828A (en)	1988-02-16	Cervically adjustable chiropractic treatment table
EP0331122A2 (de)	1989-09-06	Gelenkartiger Mechanismus für Kopfstütze
CA1114440A (en)	1981-12-15	Headpiece (head-support) having adjustable pads
JP2918040B2 (ja)	1999-07-12	ヘツドレスト傾動装置
US20050107727A1 (en)	2005-05-19	Cervical traction device
EP4331549A1 (de)	2024-03-06	Systeme und verfahren zur patientenpositionierung von hintergrund
KR101974037B1 (ko)	2019-05-02	위치설정유닛 및 이를 구비한 의자용 팔걸이
JPH0698913A (ja)	1994-04-12	歯科治療用椅子のヘッドレストの角度付与装置
EP4335424A1 (de)	2024-03-13	Verstellvorrichtung zur lösbaren kopplung einer rückenlehne an einem sitz
CN219743181U (zh)	2023-09-26	一种俯卧位头垫

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1989-07-22	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
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