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US3877751A - Split back dental chair apparatus - Google Patents

Split back dental chair apparatus Download PDF

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Publication number
US3877751A
US3877751A US384013A US38401373A US3877751A US 3877751 A US3877751 A US 3877751A US 384013 A US384013 A US 384013A US 38401373 A US38401373 A US 38401373A US 3877751 A US3877751 A US 3877751A
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United States
Prior art keywords
bracket
keyway
backrest
thin profile
dental chair
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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
Application number
US384013A
Inventor
Keith O Rasmussen
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HEK Manufacturing Co Inc
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HEK Manufacturing Co Inc
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Priority to US384013A priority Critical patent/US3877751A/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Supports for the head or the back
    • A47C7/38—Supports for the head or the back for the head, e.g. detachable
    • 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

  • the present invention relates to a SPLIT BACK DENTAL CHAIR APPARATUS. and more particularly to a kit for converting the back of a conventional chair to a split back configuration.
  • the linkage mechanism of such a chair and its bifurcated or curved pad head support causes a widening of the profile of the dentists chair. It has been found desirable to permit the dentist to operate on the patient in such a manner that the patients head is directly above the dentist's lap. This permits the dentist to sit down while performing his operation on the patient. To facilitate this ease of operation. it has become necessary to convert the back of the dentist's chair to a thin profile split back configuration.
  • the apparatus of the present invention may be in the form of a kit to convert the head rest assembly ofa conventional dental chair such as the kind manufactured by the SS White Company into a thin profile split back configuration to be used as a lounge-type chair.
  • the apparatus splits the back of the chair to provide a flattened head rest adjustable with respect to the back rest portion to vary the length of the back.
  • the apparatus comprises a head rest mounted on an elongated plate with a rack formed on the plate.
  • the elongated plate is proportioned to be slidable through a bracket which is mounted in the keyway of the back support member mounted on the seat frame of the dental chair.
  • the bracket is fixedly held in the keyway by a screw.
  • a latch having a projection is pin mounted on the bracket and spring biased to selectively engage the teeth of the rack. The latch may be manually disengaged from the rack to permit selective adjustment of the height of the head rest.
  • This apparatus may be in the form of a kit which may be used to convert conventional dental chairs such as the kind manufactured by the SS White Company by removing the conventional bifurcated or curved pad head support and mechanical linkages which are secured in the keyway of the back support on the chair.
  • the bracket of the present invention may be slid into the keyway of the back support and fixedly held there by a screw. The bracket may then be screwed directly to the back of the seat and the slidable elongated member mounted on the head rest may be slid through the bracket to obtain the split back configuration.
  • an object of the present invention is to provide a thin profile split back dental apparatus.
  • Another object is to provide a kit for converting the back of a conventional dental chair such as the type manufactured by the SS White Company to a thin profile split back configuration.
  • a further object of the invention is the provision of bracket means for supporting a head rest and slidable in the keyway of a dental chair.
  • Still another object is the provision in apparatus of the character described ofa latch which is pin mounted on a bracket and having a projection for selectively engaging the teeth of a rack mounted on an elongated plate formed for supporting a head rest.
  • FIG. I is a fragmentary perspective view of a dental chair with the split back configuration shown in solid and the conventional swingable head support and linkage shown in phantom;
  • FIG. 2 is a side elevational view of the back portion of the apparatus of the present invention showing the thin profile achieved thereby;
  • FIG. 3 is a sectional view taken substantially along the plane of line 3-3 of FIG. 2;
  • FIG. 4 is a sectional view taken substantially along the plane of line 4-4 of FIG. 2.
  • FIG. 1 there is shown a dental chair 10 having a head rest 11 mounted on an elongated plate 12 which is slidable in a bracket 13.
  • the plate 12 has a rack 14 as shown in greater detail in FIGS. 2 and 4 and the bracket 13 has a latch 16 which is biased by a spring I7 to urge the projection 18 of the latch to engage the rack 14 in ratchet fashion.
  • the latch 16 may be manually pivoted by an ear 19 formed thereon around a pivot pin 21 to disengage the projection 18 of the latch 16 from the rack 14 to thereby permit the height of the head rest 11 to be selectively adjusted to any desired level.
  • the apparatus is readily adaptable to conventional dental chairs such as the kind manufactured by the SS White Company and copies thereof having a back support 22 with a keyway as shown in FIG. I.
  • a conventional swingable head support 23 is supported by linkages 24 and 26 which are mounted in the keyway.
  • the linkages may be removed and the bracket 13 may be slid in the keyway and secured therein by a screw 27 as shown in FIG. 3.
  • the bracket itself may be secured to a back 28 of the dental chair by screws 29.
  • the apparatus of the present invention permits the dental chair to be converted to a thin profile split back configuration as shown in- FIG. 2 from the'conventional thick profile configuration having a bifurcated or curved pad support assembly with swingable linkages as shown in phantom in FIG. I.
  • This permits the dentist to operate on the patient while the patient's head is directly above the dentist's lap to thereby permit the dentist to sit down while operating on the patient.
  • a thin .profile split back conversion for a dental chair having a frame including a tiltable back support member formed with a keyway for slidably supporting a backrest and an articulated headrest. said conversion comprising a bracket formed for slidable mounting in the keyway of the back support member and having a second keyway formed therein;
  • a thin profile headrest havingan elongated tongue slidable in said second keyway and formed with a claim 1 and wherein said bracket is of substantially U- shaped cross section opening toward said backrest, and mounting ears are formed at the corners of said bracket for rigidly securing to said backrest.

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  • 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)

Abstract

A dental chair conversion apparatus capable of use as a loungetype chair and having an adjustable head rest mounted on an elongated plate with a rack formed thereon and with the plate and rack slidable in a bracket which is mounted in the keyway of a conventional back support of the dental chair and fixedly held there by a screw. A latch having a projection is pin mounted through ears on the bracket and spring biased to permit manual operation of the latch to selectively engage the rack in ratchet fashion, to permit manual adjustment of the height of the head rest.

Description

United States Patent Rasmussen 1 1 Apr. 15, 1975 [54] SPLIT BACK DENTAL CHAIR APPARATUS 1,260,032 3/1918 Pcrpick 297/410 1,867,600 7 1932 S h k f 297 ll [75] Inventor: Keith 0. Rasmussen, San Francisco, I c warz Op 0 C' lf.
a l Primary Examiner-Casmrr A. Nunberg [73] Assignee: Hek Manufacturing Company, Inc., Attorney, A nt, r Firm s happ and Hatch San Francisco, Calif.
[22] Filed: July 30, 1973 [57] ABSTRACT [21] Appl. No.: 384,013 A dental chair conversion apparatus capable of use as a lounge-type chair and having an adjustable head rest mounted on an elongated plate with a rack formed [52] U.S. C1 297/410, 297/408 thereon and with the plate and rack Slidable in a [51] Int. Cl A47c 7/36; A47c 7/42 Field of Search 297/410 396 408 4l0 bracket which 18 mounted in the keyway of a conventional back support of the dental chair and fixedly [56] References Cited held there by a screw. A latch having a pro ection 15 pm mounted through ears on the bracket and spring UNITED STATES PATENTS biased to permit manual operation of the latch to se- 942,603 2/190 Undcland 4 97/ 10 X lectively engage the rack in ratchet fashion, to permit 955.094 4/19l0 MCNCC' 297/7'10 X manual adjustment of the height of the head rest. 1,078,828 11/1913 Campbell.... 297/410 X 1,196,413 8/1916 Yohe 297/410 2 Claims, 4 Drawing Figures PATENIEDAPR 1 51915 FIE--3 SPLIT BACK DENTAL CHAIR APPARATUS BACKGROUND OF THE INVENTION The present invention relates to a SPLIT BACK DENTAL CHAIR APPARATUS. and more particularly to a kit for converting the back of a conventional chair to a split back configuration.
Various conventional dental chairs havebeen constructed to have a single back and a bifurcated or curved pad head support. Dental chairs of this type manufactured by the SS White Company are characteristically constructed so that the bifurcated or curved pad head rest is coupled to mechanical linkages mounted on a back support of the dental chair. Such head rest assemblies have been also used for prosthetic operations by dentists.
The linkage mechanism of such a chair and its bifurcated or curved pad head support however. causes a widening of the profile of the dentists chair. It has been found desirable to permit the dentist to operate on the patient in such a manner that the patients head is directly above the dentist's lap. This permits the dentist to sit down while performing his operation on the patient. To facilitate this ease of operation. it has become necessary to convert the back of the dentist's chair to a thin profile split back configuration.
SUMMARY OF THE INVENTION The apparatus of the present invention may be in the form ofa kit to convert the head rest assembly ofa conventional dental chair such as the kind manufactured by the SS White Company into a thin profile split back configuration to be used as a lounge-type chair. In effect. the apparatus splits the back of the chair to provide a flattened head rest adjustable with respect to the back rest portion to vary the length of the back. The apparatus comprises a head rest mounted on an elongated plate with a rack formed on the plate. The elongated plate is proportioned to be slidable through a bracket which is mounted in the keyway of the back support member mounted on the seat frame of the dental chair. The bracket is fixedly held in the keyway by a screw. A latch having a projection is pin mounted on the bracket and spring biased to selectively engage the teeth of the rack. The latch may be manually disengaged from the rack to permit selective adjustment of the height of the head rest.
This apparatus may be in the form of a kit which may be used to convert conventional dental chairs such as the kind manufactured by the SS White Company by removing the conventional bifurcated or curved pad head support and mechanical linkages which are secured in the keyway of the back support on the chair. The bracket of the present invention may be slid into the keyway of the back support and fixedly held there by a screw. The bracket may then be screwed directly to the back of the seat and the slidable elongated member mounted on the head rest may be slid through the bracket to obtain the split back configuration.
Accordingly, an object of the present invention is to provide a thin profile split back dental apparatus.
Another object is to provide a kit for converting the back of a conventional dental chair such as the type manufactured by the SS White Company to a thin profile split back configuration.
A further object of the invention is the provision of bracket means for supporting a head rest and slidable in the keyway of a dental chair.
Still another object is the provision in apparatus of the character described ofa latch which is pin mounted on a bracket and having a projection for selectively engaging the teeth of a rack mounted on an elongated plate formed for supporting a head rest.
Further objects and advantages of the present invention will become apparent as the specification proceeds. and the new and useful features thereof will be fully defined in the claims attached hereto.
BRIEF DESCRIPTION OF THE DRAWINGS The preferred forms of the present invention are illustrated in the accompanying drawings, forming part of the specification, in which:
FIG. I is a fragmentary perspective view of a dental chair with the split back configuration shown in solid and the conventional swingable head support and linkage shown in phantom;
FIG. 2 is a side elevational view of the back portion of the apparatus of the present invention showing the thin profile achieved thereby;
FIG. 3 is a sectional view taken substantially along the plane of line 3-3 of FIG. 2; and
FIG. 4 is a sectional view taken substantially along the plane of line 4-4 of FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS I Referring now to FIG. 1, there is shown a dental chair 10 having a head rest 11 mounted on an elongated plate 12 which is slidable in a bracket 13. The plate 12 has a rack 14 as shown in greater detail in FIGS. 2 and 4 and the bracket 13 has a latch 16 which is biased by a spring I7 to urge the projection 18 of the latch to engage the rack 14 in ratchet fashion. The latch 16 may be manually pivoted by an ear 19 formed thereon around a pivot pin 21 to disengage the projection 18 of the latch 16 from the rack 14 to thereby permit the height of the head rest 11 to be selectively adjusted to any desired level.
The apparatus is readily adaptable to conventional dental chairs such as the kind manufactured by the SS White Company and copies thereof having a back support 22 with a keyway as shown in FIG. I. A conventional swingable head support 23 is supported by linkages 24 and 26 which are mounted in the keyway. The linkages may be removed and the bracket 13 may be slid in the keyway and secured therein by a screw 27 as shown in FIG. 3. The bracket itself may be secured to a back 28 of the dental chair by screws 29.
Hence the apparatus of the present invention permits the dental chair to be converted to a thin profile split back configuration as shown in- FIG. 2 from the'conventional thick profile configuration having a bifurcated or curved pad support assembly with swingable linkages as shown in phantom in FIG. I. This permits the dentist to operate on the patient while the patient's head is directly above the dentist's lap to thereby permit the dentist to sit down while operating on the patient.
Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.
I claim:
1. A thin .profile split back conversion for a dental chair having a frame including a tiltable back support member formed with a keyway for slidably supporting a backrest and an articulated headrest. said conversion comprising a bracket formed for slidable mounting in the keyway of the back support member and having a second keyway formed therein;
means for adjustably securing said bracket in said first named keyway;
a thin profile backrest secured to said bracket;
a thin profile headrest havingan elongated tongue slidable in said second keyway and formed with a claim 1 and wherein said bracket is of substantially U- shaped cross section opening toward said backrest, and mounting ears are formed at the corners of said bracket for rigidly securing to said backrest.
2. A thin profile split back conversion as described in

Claims (2)

1. A thin profile split back conversion for a dental chair having a frame including a tiltable back support member formed with a keyway for slidably supporting a backrest and an articulated headrest, said conversion comprising a bracket formed for slidable mounting in the keyway of the back support member and having a second keyway formed therein; Means for adjustably securing said bracket in said first named keyway; a thin profile backrest secured to said bracket; a thin profile headrest having an elongated tongue slidable in said second keyway and formed with a series of ratchet teeth therealong; a pawl pivotally mounted on said bracket medially thereof in underlying relation to said backrest and formed for selective engagement with said ratchet teeth; spring means urging said pawl against said teeth; and a handle secured to said pawl and extending laterally from said bracket for selective manual engagement and manipulation to disengage said pawl.
2. A thin profile split back conversion as described in claim 1 and wherein said bracket is of substantially U-shaped cross section opening toward said backrest, and mounting ears are formed at the corners of said bracket for rigidly securing to said backrest.
US384013A 1973-07-30 1973-07-30 Split back dental chair apparatus Expired - Lifetime US3877751A (en)

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5478889A (en) * 1977-12-06 1979-06-23 Ginzou Ishii Medical chair
US4483565A (en) * 1981-06-22 1984-11-20 Ikeda Bussan Co., Ltd. Head rest stay retaining device
US5382077A (en) * 1992-07-29 1995-01-17 Doerner Products Ltd. Height adjustment mechanism for a chair seat back
US5918941A (en) * 1998-08-17 1999-07-06 Kigel; Rudolf Headrest mounting assembly for a chair and the like
US6368261B1 (en) * 1998-03-14 2002-04-09 Steven John Doehler Desk chair for the prevention of repetitive stress injuries
EP1318776A1 (en) * 2000-09-19 2003-06-18 Han-Keel Yoo Chair for correcting an improper alignment of spinal vertebrae and method for correcting an improper alignment of spinal vertebrae by means of the chair
US6758450B2 (en) * 1999-11-05 2004-07-06 Alfred G. Niederman Modular furniture including interchangeable upholstery
US20090001799A1 (en) * 2007-06-29 2009-01-01 Diller Mark G Procedure chair with interchangeable headrests
US20100201176A1 (en) * 2009-02-11 2010-08-12 Dental Equipment, Llc, Dba Pelton & Crane Biarticulated headrest for chair
CN102362741A (en) * 2011-10-13 2012-02-29 陈育 Structure for connecting backrest and headrest of chair
CN102366253A (en) * 2011-10-13 2012-03-07 陈育 Chair improvement
US20120200134A1 (en) * 2011-02-08 2012-08-09 Yu-Shan Lai Pillow Support Structure of a Chair
US20150151137A1 (en) * 2013-11-29 2015-06-04 Nexstim Oy Device support apparatus
US20160045030A1 (en) * 2014-08-14 2016-02-18 Zenithen USA. LLC. d/b/a Z Company Headrests for universal folding chairs
US20160227934A1 (en) * 2016-01-25 2016-08-11 Dongguan Weihong Hardware And Plastic Products Co., Ltd. Automatic support system for headrest
US9521908B1 (en) * 2013-07-22 2016-12-20 Beckfoley Llc Head rest for chair
CN108618931A (en) * 2018-04-26 2018-10-09 未来康健（北京）医疗技术研究院有限公司 A kind of combined multifunctional ear-nose-throat department inspection equipment
WO2019005493A1 (en) 2017-06-27 2019-01-03 Bryan Bourgeois Headrest Cushion Assembly for Neck Pain
US10327554B2 (en) 2016-02-10 2019-06-25 The Comfort Companies, Llc Adjustable head support
US10716721B2 (en) 2017-08-11 2020-07-21 The Comfort Companies, Llc Hinge assembly for a wheelchair component
US11134784B2 (en) * 2019-11-06 2021-10-05 Guangzhou Huashi Furniture Manufacturing Co., Ltd. Head restraint
US11166560B2 (en) * 2018-11-08 2021-11-09 Yi-Ru Chen Headrest device of office chair
US20220161701A1 (en) * 2020-11-20 2022-05-26 Hyundai Motor Company Device for adjusting position of headrest for vehicle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US942603A (en) * 1909-05-19 1909-12-07 Andrew L Undeland Head-rest for barber-chairs.
US955094A (en) * 1909-08-11 1910-04-12 Lewis F Mcneel Head-rest bar.
US1078828A (en) * 1911-04-18 1913-11-18 Henry E Campbell Barber's-chair head-rest.
US1196413A (en) * 1913-05-15 1916-08-29 Charles E Yohe Head-rest.
US1260032A (en) * 1917-10-13 1918-03-19 Mike Perpick Barber-chair attachment.
US1867600A (en) * 1929-07-08 1932-07-19 Theo A Kochs Company Barber's chair

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US942603A (en) * 1909-05-19 1909-12-07 Andrew L Undeland Head-rest for barber-chairs.
US955094A (en) * 1909-08-11 1910-04-12 Lewis F Mcneel Head-rest bar.
US1078828A (en) * 1911-04-18 1913-11-18 Henry E Campbell Barber's-chair head-rest.
US1196413A (en) * 1913-05-15 1916-08-29 Charles E Yohe Head-rest.
US1260032A (en) * 1917-10-13 1918-03-19 Mike Perpick Barber-chair attachment.
US1867600A (en) * 1929-07-08 1932-07-19 Theo A Kochs Company Barber's chair

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5478889A (en) * 1977-12-06 1979-06-23 Ginzou Ishii Medical chair
US4483565A (en) * 1981-06-22 1984-11-20 Ikeda Bussan Co., Ltd. Head rest stay retaining device
US5382077A (en) * 1992-07-29 1995-01-17 Doerner Products Ltd. Height adjustment mechanism for a chair seat back
US6368261B1 (en) * 1998-03-14 2002-04-09 Steven John Doehler Desk chair for the prevention of repetitive stress injuries
US5918941A (en) * 1998-08-17 1999-07-06 Kigel; Rudolf Headrest mounting assembly for a chair and the like
US6758450B2 (en) * 1999-11-05 2004-07-06 Alfred G. Niederman Modular furniture including interchangeable upholstery
EP1318776A1 (en) * 2000-09-19 2003-06-18 Han-Keel Yoo Chair for correcting an improper alignment of spinal vertebrae and method for correcting an improper alignment of spinal vertebrae by means of the chair
EP1318776A4 (en) * 2000-09-19 2004-10-13 Han-Keel Yoo Chair for correcting an improper alignment of spinal vertebrae and method for correcting an improper alignment of spinal vertebrae by means of the chair
US20090001799A1 (en) * 2007-06-29 2009-01-01 Diller Mark G Procedure chair with interchangeable headrests
US8641147B2 (en) * 2007-06-29 2014-02-04 Midmark Corporation Procedure chair with interchangeable headrests
US20100201176A1 (en) * 2009-02-11 2010-08-12 Dental Equipment, Llc, Dba Pelton & Crane Biarticulated headrest for chair
US7871130B2 (en) * 2009-02-11 2011-01-18 Dental Equipment, Llc Biarticulated headrest for chair
US20120200134A1 (en) * 2011-02-08 2012-08-09 Yu-Shan Lai Pillow Support Structure of a Chair
US8303040B2 (en) * 2011-02-08 2012-11-06 Yu-Shan Lai Pillow support structure of a chair
CN102362741A (en) * 2011-10-13 2012-02-29 陈育 Structure for connecting backrest and headrest of chair
CN102366253A (en) * 2011-10-13 2012-03-07 陈育 Chair improvement
CN102366253B (en) * 2011-10-13 2014-03-26 陈育 Chair improvement
CN102362741B (en) * 2011-10-13 2014-03-26 陈育 Structure for connecting backrest and headrest of chair
US9521908B1 (en) * 2013-07-22 2016-12-20 Beckfoley Llc Head rest for chair
US20150151137A1 (en) * 2013-11-29 2015-06-04 Nexstim Oy Device support apparatus
US10188868B2 (en) * 2013-11-29 2019-01-29 Nexstim Oyj Device support apparatus
US20160045030A1 (en) * 2014-08-14 2016-02-18 Zenithen USA. LLC. d/b/a Z Company Headrests for universal folding chairs
US9861204B2 (en) * 2016-01-25 2018-01-09 Dongguan Weihong Hardware And Plastic Products Co., Ltd. Automatic support system for headrest
US20160227934A1 (en) * 2016-01-25 2016-08-11 Dongguan Weihong Hardware And Plastic Products Co., Ltd. Automatic support system for headrest
US10327554B2 (en) 2016-02-10 2019-06-25 The Comfort Companies, Llc Adjustable head support
US11510494B2 (en) 2016-02-10 2022-11-29 The Comfort Companies, Llc Adjustable head support
JP2020525257A (en) * 2017-06-27 2020-08-27 ブルジョア，ブライアン Headrest cushion assembly for neck pain
WO2019005493A1 (en) 2017-06-27 2019-01-03 Bryan Bourgeois Headrest Cushion Assembly for Neck Pain
EP3644797A4 (en) * 2017-06-27 2021-03-31 Bryan Bourgeois HEADREST PILLOW ARRANGEMENT FOR NECK PAIN
AU2018291973B2 (en) * 2017-06-27 2024-02-29 Bryan Bourgeois Headrest cushion assembly for neck pain
US10716721B2 (en) 2017-08-11 2020-07-21 The Comfort Companies, Llc Hinge assembly for a wheelchair component
CN108618931A (en) * 2018-04-26 2018-10-09 未来康健（北京）医疗技术研究院有限公司 A kind of combined multifunctional ear-nose-throat department inspection equipment
US11166560B2 (en) * 2018-11-08 2021-11-09 Yi-Ru Chen Headrest device of office chair
US11134784B2 (en) * 2019-11-06 2021-10-05 Guangzhou Huashi Furniture Manufacturing Co., Ltd. Head restraint
US20220161701A1 (en) * 2020-11-20 2022-05-26 Hyundai Motor Company Device for adjusting position of headrest for vehicle
US11491902B2 (en) * 2020-11-20 2022-11-08 Hyundai Motor Company Device for adjusting position of headrest for vehicle

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