US3874728A - Dental patients chair with a parallelogram supporting arm - Google Patents

Dental patients chair with a parallelogram supporting arm Download PDF

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Publication number
US3874728A
US3874728A US407179A US40717973A US3874728A US 3874728 A US3874728 A US 3874728A US 407179 A US407179 A US 407179A US 40717973 A US40717973 A US 40717973A US 3874728 A US3874728 A US 3874728A
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Prior art keywords
axle
spindle
arm
chair
chair according
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Expired - Lifetime
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US407179A
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English (en)
Inventor
Rolf-Jurgen Weiland
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Siemens AG
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Siemens AG
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    • 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
    • A61G15/02—Chairs with means to adjust position of patient; Controls therefor

Definitions

  • Hydraulic lifting devices have been used for the height adjustment of the parallelogram arm of such patients chairs, since they can raise the weight of the heavy upper chair part along with the patient at most inconvenient lever arrangements in the deepest end position (pressure forces in the size of more than one thousand kilopond). Furthermore, they are so small that it is possible to provide them in a sufficiently narrow parallelogram carrier. (A widening of parallelogram arms would make difficult an easy movement of the doctor to the chair or the patient and would affect his work). However, it is necessary to accept the drawback of these hydraulic devices consisting in that devices cannot be obtained which are sufficiently oil tight. It was found that in the course of years these leakage losses dirty the lower chair portions and the floor of the treating room. Chair parts dirtied by oil can be cleaned only with considerable expense and loss of time which cannot be compensated.
  • An object of the present invention is to provide a dental patients chair of the described type which can produce the high pressure forces required for adjusting the chair without it being necessary to substantially increase the size of the parallelogram arm, which can be operated more simply and which cannot produce dirt by oil through oil leakage. Another object is the dimi nution of costs of making the chair.
  • a spindle drive actuated by electromotor and engaging the parallelogram supporting arm preferably between two diagonally opposed link axes of the arm ends.
  • the use of the spindle drive not only eliminates the above-mentioned drawbacks of known devices but also has the advantage that substantially fewer structural parts are necessary. Furthermore, the transporting and the mounting are simplified since there are no more dependent drives for shifting the back and adjusting the seat by means of the parallelogram arm, as is the case in known chairs. There it was necessary to apply pressure upon oil transmitted by an oil pump located in the base in addition to the hydraulic circuit for the carrying arm, also in the hydraulic circuit of the raising device for moving the back, which is located in the upper part of the chair.
  • the spindle drive should be a roller screw drive, preferably a ball spindle drive. It is advantageous to switch a self-locking drive in front of the roller screw drive since this eliminates the use of more expensive means for locking the driving motor when standing still.
  • the driving motor can be arranged in or outside of the parallelogram carrying arm. Since the parallelogram carrying arm due to its box-like structure constitutes a hollow body with good resonance properties which could strengthen the noises of the motor, it is advantageous to arrange the motor outside of the parallelogram carrying arm. This also eliminates sound absorbing provisions which are difficult to attain.
  • the advantageous arrangement of the driving motor arranged outside the supporting arm has the further advantage that the motor is easier to reach (for exchange of brushes. belts etc.).
  • connection of the spindle or spindle nut to the diagonally extending link axes of the supporting arm is not absolutely necessary but is advantageous since it avoid undesirable bending forces which could affect parallelogram rods.
  • FIG. 1 is a perspective view of a dental chair.
  • FIG. 2 is a perspective view of the base of the chair.
  • FIG. 3 is a partial perspective view of a different chair base.
  • FIG. 4 is a partial perspective view showing the para]- lelogram carrying arm of FIG. 1 in its lowermost position.
  • FIG. 5 is a partial top view of the same carrying arm.
  • FIG. 6 is a partial sectional view showing the axial bearing of the arm.
  • FIG. 7 is a partial sectional view showing the spindle drive of the arm.
  • FIG. 1 shows a dental patients chair having a base 1 to which the parallelogram carrying arm 2 is connected.
  • a support 3 is arranged at the free end of the arm and carries the chair upper part consisting substantially of the back 4 and the seat 5.
  • the back 4 can be inclined about the axis 6 relatively to the seat 5 and the seat 5 can be tipped relatively to the carrier 3 about an axis also extending transversely to the longitudinal axis of the chair which is not shown in the drawing.
  • the three adjusting movements, namely, the inclination of the back, the tipping of the seat and the height adjustment of the upper part of the chair are actuated by means of the parallelogram carrying arm by actuating members 7 to 9 provided upon the back 4.
  • the actuating members 7 to 9 are located upon the upper part of the back 4 and are so arranged that they can be operated from the back surface of the back as well as from its upper side.
  • the back is made very thin so as to provide a sufficient freedom of foot movement for the seated person in the lower chair position when the back is substantially vertical. In order to avoid extending parts the actuating members 7 to 9 are embedded in the chair back.
  • the base 1 consists substantially of a bottom part 11 upon the front portion of which on opposite sides are provided two vertical side pieces 12, 13 in which the parallelogram arm 2 is swingably mounted.
  • the side pieces l2, 13 are covered by removable covering sheets 17, 18.
  • the parallelogram 2 can be moved from the illustrated position into a deep position in which the arm extends substantially horizontally (FIG. 4).
  • a stepping plate 14 which is swingably mounted and which cooperates with switching members in the base 11 in such manner that when the plate 14 is stepped on the drive for moving the parallelogram 2 is switched off.
  • This arrangement serves for the safety ofthe operator if by mistake an object (foot of the operator or chair) reaches into the moving range of the carrier 3 or the parallelogram carrier 2 during the downward movement of the chair.
  • the base 1 consists of a welded structure formed by a plate 15 which can be fixed to the floor, a box-shaped cover 16 and side pieces 12, 13 welded on both sides of the part 16 to the plate 15.
  • Each of the side pieces 12, 13 consists of two half shells 19, 20 welded to each other and held by space supports 21.
  • the half shells are made of sheet metal (drawn or pressed part).
  • Bushings supporting the bearing axles 22 and 24 ofthe parallelogram arm are welded in the half shells 19, 20.
  • the cover 16 is made ofa sheet plate by suitable cutting and edge forming. Within the box which is thus formed there are provided sheet profiles 26 which are welded both to the cover 16 and to the plate 15 and extend parallel to the longitudinal sides of the base plate. The sheet profiles are also produced in a bending process.
  • the cover 16 has a recess which forms with the base plate 16 an open box 27 containing two switches 28 as well as different electrical connecting parts 29.
  • the switches 28 are actuated by the stepping plate 14 shown in FIG.
  • FIG. 3 shows a different construction of a welded base for supporting the parallelogram carrying arm 2.
  • the basic part is constituted by a base plate 30 and welded four edged hollow profile rods 31, 32.
  • the hollow profile rods 31, 32 provide a safe frame free from windings.
  • Upon the frame is provided a sheet covering 33.
  • the side pieces for supporting the parallelogram carrying arm consist of struts 34 to 37 which are welded together also from hollow profile rods.
  • the two welded constructions are technically very easy to manufacture, they have a low transportation weight and are very suitable for receiving side loads.
  • the last-described construction is particularly easy to produce without a great use of special tools.
  • FIG. 4 shows the parallelogram carrying arm 2 swingably connected to the base 1 in its lowermost position.
  • the drawing shows the parallelogram carrying arm partly in section for better illustration of its adjusting means.
  • the parallelogram arm 2 consists substantially of two halves 40 and 41, whereby the upper half 40 is swingably connected on the one hand by an axle 22 to the side pieces 12, 13 and on the other hand is connected by an axle 23 to the carrier 3.
  • the lower carrying arm half 41 is also connected to the side pieces 12, 13 by an axle 24 and is mounted in the carrier 3 by an axle 25.
  • the movement of the parallelogram arm 2 and thus of the carrier 3 for the upper part 4, 5 of the chair takes place by an electromechanical drive consisting of an electromotor 39, a drive 46 and a ball revolving spindle 47.
  • the motor 39 is mounted upon the base plate 15 outside of the box-shaped parallelogram carrying arm 2.
  • the power transmission from the motor takes place by a V-belt 48 and a roller 49 and from there through a further V-belt 50 to the driving shaft 51 of a worm gear to which the rotary spindle 58 of the spindle drive 47 is connected on the side away from the drive.
  • the motor is fixed to a holding device 52 adjustably connected to the base plate 15 for tensioning the V-belt 48.
  • the V-belt 48 can receive the necessary belt tension by a tensioning screw 53.
  • the drive 46 is connected by a pin 45 flanged thereto to the axle 24.
  • the spindle nut 54 is connected to the axle 23, so that the spindle drive engages between the diagonal axles 23, 24 of the parallelogram rectangle 22 to 25.
  • the motor 39 is covered by a removable cover 57.
  • FIG. 5 shows the parallelogram carrying arm in top view, some parts of the arm and coverings being also sectioned.
  • the roller 49 is a part of an intermediate shaft which can be easily removed from the axle bearing 24 for the replacement of the V-belts 48 and 50. Details of the axle bearing 24 are shown in FIG. 6.
  • the lower half4l of the parallelogram carrying arm 2 is supported on the one hand by a bolt 62 and a sliding bearing 63 in the side piece 13 and on the other hand by a further bolt 64 and a further sliding bearing 65 in the side piece 12.
  • the intermediate shaft 60 is rotatably mounted by two ball bearings 66, 67 upon a plug axle 68 serving as a bearing axle.
  • An inner six edge screw is used as the plug axle, which engages on the one hand with its head ajoint of the bearing part 62 and on the other hand is screwed into the bearing bolt 64.
  • the two bearing bolts 62, 64 are protected against rotation by radially directed screws 69, 70.
  • FIG. 7 shows partly in longitudinal section the spindle drive 47 engaging on the one hand the axle bearing 24 (at the bearing bolt 64) and on the other hand the spindle drive 47 engaging the axle bearing 23.
  • the drive 46 which is in general use, is screwed to a flange of the bolt 45.
  • the sectional view of FIG. 7 shows the inner structure of the spindle nut 54.
  • the spindle nut 54 is transversely separated at the location 71 into a part 72 containing the rotary ball part and a part 74 receiving a switch 73 and connected with the axle bearing 23. Both parts 72 and 74 are screwed together by three circumferentially located screws 75 while leaving a small axial play 76.
  • the three screws 75 serve only to transmit the action transmitted from the driving spindle 58 to the spindle nuts 72, 74. If, however, the driving spindle is subjected to pull. then the two parts 72 and 74 are raised from each other. When the two parts are separated. the switch 73 fixed to the part 74 is switched on. since the actuating pin 76 is raised from its support 77 (part of 72). The switch 73 is included in the circuit of the driving motor 39, so that when the switch is actuated the motor stops immediately.
  • the spindle 58 has a rise of about l2 mm.
  • balls 78 which are placed next to each other as an endless chain. When the spindle is rotated the balls move in the screw thread passages. During one direction of rotation of the spindle the balls leave the screw thread passages at the location 79 and run into a channel 80 of the part 72, where they move out of the opening 81 and move back into the screw thread passages of the spindle. The movement of the balls is reversed in the opposite direction of rotation.
  • a dental patients chair comprising a base, a seat. a parallelogram carrying arm having one end connected with said base and the other end carrying said seat, the ends of said arm having diagonally opposed axles, and a device for height shifting of the seat, said device comprising an electrically driven spindle drive engaging said arm between said axles.
  • said spindle drive comprising a motor, a rotary spindle driven by said motor, a bearing for the spindle connected with one of said axles and a screw nut engaging said spindle and connected with that end of the arm having the other one of said axles.
  • a chair according to claim 2 having an intermidiate shaft connected with said motor and transmitting the drive of said motor to said spindle.
  • a chair according to claim 3 having an axle supporting said intermidiate shaft, the last-mentioned axle being in alignment with said one axle.
  • a chair according to claim 4 wherein the lastmentioned axle and said one axle form a continuous axle bearing.
  • a chair according to claim 6, comprising a plug axle and two opposed bearings for said one axle and supporting said plug axle.
  • said intermediate shaft being rotatably mounted upon said plug axle.
  • said spindle drive comprises a safety switch operable when sub jected to tension for interrupting the circuit of said driving motor.

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  • Health & Medical Sciences (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)
  • Chairs Characterized By Structure (AREA)
  • General Details Of Gearings (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
  • Transmission Devices (AREA)
  • Gear Transmission (AREA)
US407179A 1972-10-21 1973-10-17 Dental patients chair with a parallelogram supporting arm Expired - Lifetime US3874728A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2251808A DE2251808C3 (de) 1972-10-21 1972-10-21 Zahnärztlicher Patientenstuhl mit Parallelogrammtragarm

Publications (1)

Publication Number Publication Date
US3874728A true US3874728A (en) 1975-04-01

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ID=5859751

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US407179A Expired - Lifetime US3874728A (en) 1972-10-21 1973-10-17 Dental patients chair with a parallelogram supporting arm

Country Status (11)

Country Link
US (1) US3874728A (nl)
JP (2) JPS4973890A (nl)
BR (1) BR7308197D0 (nl)
CS (1) CS171184B2 (nl)
DE (1) DE2251808C3 (nl)
FR (1) FR2193325A5 (nl)
GB (1) GB1448238A (nl)
IT (1) IT995995B (nl)
SE (1) SE393529B (nl)
SU (1) SU673145A3 (nl)
YU (1) YU36331B (nl)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4534077A (en) * 1983-10-03 1985-08-13 Simmons Universal Corporation Hospital bed having safety mechanism
US4586398A (en) * 1983-09-29 1986-05-06 Hamilton Industries Foot control assembly for power-operated tables and the like
US5088676A (en) * 1988-06-30 1992-02-18 Ncr Corporation Compact height adjustable base for a display
US5214360A (en) * 1992-03-13 1993-05-25 Den-Tal-Ez, Inc. Programmable adjustable chair for medical and dental applications
EP1252874A2 (de) * 2001-04-23 2002-10-30 Ferdinand Lusch Gmbh & Co. Kg. Durch einen Antrieb verstellbares Sitzmöbel
US20050039643A1 (en) * 2003-08-22 2005-02-24 Siemens Medical Solutions Usa, Inc. Multiple position support structure
US20060085913A1 (en) * 2002-08-29 2006-04-27 Hideo Kawakami Movable bed
US20080067852A1 (en) * 2003-08-28 2008-03-20 A-Dec, Inc., Patient chair
US20110084528A1 (en) * 2009-10-13 2011-04-14 In-Tra-Tec GmbH Delordosation device
US20110095587A1 (en) * 2008-11-27 2011-04-28 Jeff Baker Articulated chair having universal reclining armrest system
US20170065083A1 (en) * 2008-11-27 2017-03-09 Medical Technology Industries, Inc. Articulated chair having universal reclining armrest system
IT201600091481A1 (it) * 2016-09-09 2018-03-09 Maletti S P A Dispositivo elevatore di supporto per una poltrona
US10980692B2 (en) * 2016-08-29 2021-04-20 Mobius Imaging, Llc Table system for medical imaging
US11140987B2 (en) * 2019-02-14 2021-10-12 Deer Solutions LLC Athletic chair with adjustable heating and height
US11369539B2 (en) * 2019-05-13 2022-06-28 David J. Ahearn Dental chair
US11730655B2 (en) 2019-05-13 2023-08-22 David J. Ahearn Dental chair
USD1015539S1 (en) * 2022-07-22 2024-02-20 Silverfox Corporation Limited Nursing bed
USD1016297S1 (en) * 2022-07-19 2024-02-27 Silverfox Corporation Limited Nursing bed
USD1017046S1 (en) * 2022-07-19 2024-03-05 Silverfox Corporation Limited Nursing bed

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1069479B (it) * 1976-06-11 1985-03-25 Conti Eurodent Attuatore particolarmente per la regolazione in altezza delle sedie per dentisti
JPS6130671Y2 (nl) * 1977-04-26 1986-09-08
DE102006051480B4 (de) * 2006-10-31 2018-05-30 Kaltenbach & Voigt Gmbh Zahnärztlicher Behandlungsstuhl und zahnärztlicher Behandlungsplatz mit seitlichem Viergelenkgetriebe
JP2020185142A (ja) * 2019-05-14 2020-11-19 株式会社モリタ東京製作所 診療用椅子

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US2526248A (en) * 1946-07-12 1950-10-17 Frank J Luketa Lounge chair
US3162150A (en) * 1962-08-28 1964-12-22 Borg Warner Overbed table
US3554598A (en) * 1968-10-22 1971-01-12 Sybron Corp Low silhouetted dental chair or the like

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Publication number Priority date Publication date Assignee Title
US521256A (en) * 1894-06-12 Dental chair
US1708450A (en) * 1923-11-20 1929-04-09 Ritter Dental Mfg Co Dental chair
DE1162029B (de) * 1959-09-25 1964-01-30 Embru Werke Krankenbett mit parallel zum Fussboden hoehenverstellbarem und um eine waagerechte Achse neigbarem Matratzenrahmen
US3083055A (en) * 1961-03-23 1963-03-26 Charles S Davis Patient chair
DE1847087U (de) * 1961-12-09 1962-02-22 Stiegelmeyer & Co Gmbh Vorrichtung fuer die rueckenverstellung an krankenbetten.
DE1862470U (de) * 1962-09-20 1962-11-22 Arnold L & C Vorrichtung zum verstellen der neigung von krankenbett-rahmenteilen mittels elektrischen antriebs.
US3191196A (en) * 1962-12-07 1965-06-29 Holm S Mfg Co Head and knee rest operating drives for hospital beds and the like
DE1948858U (de) * 1966-06-24 1966-11-03 Berg Fa Wilh Verstelleinrichtung fuer rueckenlehne und beinstuetze von betten, liegen od. dgl.
JPS4519326Y1 (nl) * 1967-01-20 1970-08-05
SE346213B (nl) * 1967-05-18 1972-07-03 G Osbeck
US3462772A (en) * 1967-08-11 1969-08-26 Earle A Morrison Center-pivoting bed
US3596982A (en) * 1969-05-15 1971-08-03 Surgical Mechanical Research I Patient{3 s chair
DE1941303B2 (de) * 1969-08-14 1972-01-05 Siemens AG, 1000 Berlin u 8000 München Zahnaerztlicher behandlungsstuhl
US3698673A (en) * 1971-02-16 1972-10-17 American Hospital Supply Corp Base for adjustable chairs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526248A (en) * 1946-07-12 1950-10-17 Frank J Luketa Lounge chair
US3162150A (en) * 1962-08-28 1964-12-22 Borg Warner Overbed table
US3554598A (en) * 1968-10-22 1971-01-12 Sybron Corp Low silhouetted dental chair or the like

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4586398A (en) * 1983-09-29 1986-05-06 Hamilton Industries Foot control assembly for power-operated tables and the like
US4534077A (en) * 1983-10-03 1985-08-13 Simmons Universal Corporation Hospital bed having safety mechanism
US5088676A (en) * 1988-06-30 1992-02-18 Ncr Corporation Compact height adjustable base for a display
US5214360A (en) * 1992-03-13 1993-05-25 Den-Tal-Ez, Inc. Programmable adjustable chair for medical and dental applications
EP1252874A2 (de) * 2001-04-23 2002-10-30 Ferdinand Lusch Gmbh & Co. Kg. Durch einen Antrieb verstellbares Sitzmöbel
EP1252874A3 (de) * 2001-04-23 2003-10-15 Ferdinand Lusch Gmbh & Co. Kg. Durch einen Antrieb verstellbares Sitzmöbel
US20060085913A1 (en) * 2002-08-29 2006-04-27 Hideo Kawakami Movable bed
US20050039643A1 (en) * 2003-08-22 2005-02-24 Siemens Medical Solutions Usa, Inc. Multiple position support structure
US20080067852A1 (en) * 2003-08-28 2008-03-20 A-Dec, Inc., Patient chair
US7677670B2 (en) 2003-08-28 2010-03-16 A-Dec, Inc. Patient chair
US8033613B2 (en) 2003-08-28 2011-10-11 A-Dec, Inc. Patient chair
US9782319B2 (en) * 2008-11-27 2017-10-10 Medical Technology Industries, Inc. Articulated chair having universal reclining armrest system
US20110095587A1 (en) * 2008-11-27 2011-04-28 Jeff Baker Articulated chair having universal reclining armrest system
US8480172B2 (en) * 2008-11-27 2013-07-09 Jeff Baker Articulated chair having universal reclining armrest system
US20170065083A1 (en) * 2008-11-27 2017-03-09 Medical Technology Industries, Inc. Articulated chair having universal reclining armrest system
US9125495B2 (en) 2008-11-27 2015-09-08 Medical Technologies Industries, Inc. Articulated chair having universal reclining armrest system
US8801638B2 (en) * 2009-10-13 2014-08-12 In-Tra-Tec GmbH Delordosation device
US20110084528A1 (en) * 2009-10-13 2011-04-14 In-Tra-Tec GmbH Delordosation device
US10980692B2 (en) * 2016-08-29 2021-04-20 Mobius Imaging, Llc Table system for medical imaging
US11857466B2 (en) 2016-08-29 2024-01-02 Mobius Imaging, Llc Table system for medical imaging
IT201600091481A1 (it) * 2016-09-09 2018-03-09 Maletti S P A Dispositivo elevatore di supporto per una poltrona
EP3292791A1 (en) * 2016-09-09 2018-03-14 Maletti S.p.A. Lifting support device for a chair
US11140987B2 (en) * 2019-02-14 2021-10-12 Deer Solutions LLC Athletic chair with adjustable heating and height
US11653763B2 (en) 2019-02-14 2023-05-23 Deer Solutions LLC Athletic chair with adjustable heating and height
US11369539B2 (en) * 2019-05-13 2022-06-28 David J. Ahearn Dental chair
US11730655B2 (en) 2019-05-13 2023-08-22 David J. Ahearn Dental chair
USD1016297S1 (en) * 2022-07-19 2024-02-27 Silverfox Corporation Limited Nursing bed
USD1017046S1 (en) * 2022-07-19 2024-03-05 Silverfox Corporation Limited Nursing bed
USD1015539S1 (en) * 2022-07-22 2024-02-20 Silverfox Corporation Limited Nursing bed

Also Published As

Publication number Publication date
YU249973A (en) 1981-11-13
DE2251808A1 (de) 1974-04-25
IT995995B (it) 1975-11-20
BR7308197D0 (pt) 1974-08-29
JPS4973890A (nl) 1974-07-17
YU36331B (en) 1983-06-30
JPS629860Y2 (nl) 1987-03-07
SE393529B (sv) 1977-05-16
GB1448238A (en) 1976-09-02
FR2193325A5 (nl) 1974-02-15
JPS58160036U (ja) 1983-10-25
DE2251808C3 (de) 1984-09-06
CS171184B2 (nl) 1976-10-29
DE2251808B2 (de) 1977-12-29
SU673145A3 (ru) 1979-07-05

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