EP0103341B1 - Lesegestell - Google Patents

Lesegestell Download PDF

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Publication number
EP0103341B1
EP0103341B1 EP19830201305 EP83201305A EP0103341B1 EP 0103341 B1 EP0103341 B1 EP 0103341B1 EP 19830201305 EP19830201305 EP 19830201305 EP 83201305 A EP83201305 A EP 83201305A EP 0103341 B1 EP0103341 B1 EP 0103341B1
Authority
EP
European Patent Office
Prior art keywords
work support
rod
stand
housing
reading apparatus
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
Application number
EP19830201305
Other languages
English (en)
French (fr)
Other versions
EP0103341A1 (de
Inventor
Henri Eduard Michel Melotte
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.)
Eindhoven Technical University
Original Assignee
Eindhoven Technical University
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.)
Filing date
Publication date
Application filed by Eindhoven Technical University filed Critical Eindhoven Technical University
Publication of EP0103341A1 publication Critical patent/EP0103341A1/de
Application granted granted Critical
Publication of EP0103341B1 publication Critical patent/EP0103341B1/de
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B19/00—Reading-desks; Lecterns; Pulpits, i.e. free-standing
    • A47B19/10—Reading-desks; Lecterns; Pulpits, i.e. free-standing characterised by association with auxiliary devices, e.g. paper clamps, line indicators

Definitions

  • the invention relates to reading apparatus comprising a work support, which is carried by a stand and on which a record carrier such as a book or magazine can be placed, and comprising a lens which is connected to the stand and whose distance from the work support is adjustable, which work support is vertically adjustable relative to the stand, which stand comprises two upwardly directed longitudinal guides which extend parallel to one another for the vertical adjustment of the work support, a weight-compensation means being arranged between the stand and the work support and a latching device being provided, which device comprises a latching rod which is situated between the longitudinal guides, and a latching lever which extends transversely of said rod and which is provided with a hole through which the rod extends, which lever is pivotally connected to the work support and is urged in an oblique position relative to the rod by a spring.
  • a reading apparatus of this type is disclosed in United States Patent Specification 1,451,182 and serves to enable the visually handicapped to read books, newspapers, magazines etc. with the aid of a magnifying lens.
  • the work support of the known reading apparatus is adjustable in the vertical direction by the actuation of a stationarily arranged foot-pedal. This pedal imposes a critical sitting posture and prohibits the use of the work support on a table top.
  • the construction of the known reading apparatus with a horizontally stationary work support generally requires a continual movement of the head of the reader.
  • the invention is characterized in that the work support is also movable in a horizontal direction relative to the stand, and near the end which is remote from the latching rod the latching lever is connected to an elastic hook, which hook is coupled to. an actuating rod so as to be horizontally slidable, which rod is arranged on the work support and is connected to at least one control lever situated near one of the lateral sides of the work support.
  • the reading apparatus in accordance with the invention is easy to operate during reading and can be placed on, for example, a table top.
  • a preferred embodiment of the invention is characterized in that two control levers are situated on the work support, which control levers near an upright side of the work support are each pivotally connected thereto, the actuating rod extending between the control levers in a horizontal direction.
  • a further preferred embodiment of the invention is characterized in that the latching lever is situated at least partly in a housing which is connected to the work support and which is disposed between the two longitudinal guides, a wall of said housing being provided with slot whose lower edge constitutes a pivot for the latching lever.
  • weight-compensation means comprise a length of strip steel which is coiled at least partly inside the housing, the non-coiled portion between the housing and the stand being situated near the latching rod between the longitudinal guides.
  • Still another preferred embodiment of the invention is characterized in that for the vertical guidance of the work support the housing carries a plurality of bearings which are arranged in pairs below and above the latching lever and which co-operate with the longitudinal guides during the vertical adjustment of the work support. In this way a smooth height adjustment of the work support is obtained.
  • another preferred embodiment of the invention which is provided with an illuminating device whose distance from the work support is adjustable, is characterized in that the illuminating device is adjustably connected to the lower surface of the stand by means of a pivotable parallelogram mechanism and the magnifying lens is connected to the upper side of the illuminating device.
  • the parallelogram mechanism ensures that the parallel position of the work support and the lens is maintained without obstructing the field of view.
  • the reading apparatus shown in Figs. 1 and 2 comprises a stand 1 carrying a work support 2.
  • the stand 1 comprises two tubes 3 and 4 which function as longitudinal guides and which are preferably made of aluminium to minimize their weight.
  • the tubes are interconnected by a member 5 which bears on a surface such as a table top by means of legs 6.
  • the tubes 3 and 4 extend parallel to one another in an upward direction, the tubes being interconnected at their upper ends by a connecting member 7.
  • a latching rod 8 extends substantially midway between the tubes 3 and 4, the ends of the rod being connected to the members 5 and 7 respectively.
  • the rod 8 is chrome-plated and has a diameter which is small relative to that of the tubes 3 and 4.
  • the stand 1 comprises a supporting bracket 9, which is pivotally connected to the tubes 3 and 4 which can be pivoted towards the work support 2 for easy storage of the reading apparatus.
  • a U-shaped bracket 10 which carries the pivots of a parallelogram mechanism 11.
  • said parallelogram mechanism comprises a substantially triangular plate 12, which on both sides carries a pin 13, which pins function as handles.
  • the parallelogram mechanism 11 can be adjusted relative to the work support.
  • On the plate 12 an illuminating device 14 is arranged, which device comprises a tubular lamp 15 which extends substantially horizontally.
  • a quick-connect coupling 16 enables a magnifying lens 17 to be mounted and, if required, to be replaced rapidly and easily.
  • the plate 12, the illuminating device 14 and the magnifying lens 17 are arranged in such a way that the lens 17 extends substantially parallel to the work support 2.
  • the parallelogram mechanism 11 ensures also during its adjustment when the distance of the lens 17 relative to the work support 2 is adjusted, the lens remains in a parallel position relative to the work support 2.
  • the parallelogram mechanism 11 comprises a tension spring 18 which maintains the lens setting.
  • One end portion of a bolt 19 to which the spring 18 is secured limits the pivotal movement of the parallelogram mechanism 11 in the clockwise direction.
  • a housing 20 which housing comprises walls 21 and 22 which extend parallel to the tubes 3 and 4 (see Figs. 3 and 4).
  • each of the two walls comprises a side portion 21b, 21c and 22b, 22c, respectively which is bent through substantially 45°.
  • the side portions 21 and 21c are disposed so that bearings 23 on the inner sides of these side portions extend substantially in radial directions of the tubes 3 and 4.
  • bearings 24 also extend in substantially radial directions of the tubes 3 and 4.
  • the bearings 23 are situated inside the housing 20 and the bearings 24 are disposed outside the housing in the space between the housing and the work support 2.
  • the bearings 23 and 24 are arranged pairwise at an angle of substantially 90° relative to each other near the tubes 3 and 4 respectively, so that both on the lower side and the upper side of the housing four bearings are present (see Fig. 4).
  • This arrangement of the bearings relative to each other and the construction of the housing 20 provide a satisfactory compensation of forces and a smooth guidance during the vertical adjustment of the housing 20.
  • the wall 22 carries a substantially horizontal bearing support 25, on which bearings 26 are mounted near the two ends.
  • the wall 22 carries a bearing support 27 on which a bearirig 28 is mounted. In this way a three-point mounting for the work support 2 is obtained, the lower surface of a horizontal ledge 29 engaging with the bearings 26 and the lower surface of a ledge 30, which extends parallel to the ledge 29, engaging with the bearing 28.
  • the lower bearings 26 and the upper bearing 28 together ensure that the work support 2 is guided horizontally relative to the stand 1.
  • the wall 21 On the inner side the wall 21 carries a pair of projections 31 between which a roller 32 is mounted for rotation.
  • a length of steel strip 33 is coiled on the roller 32 at least partly inside the housing. The steel strip 33 extends from the roller 32 substantially parallel to the latching rod 8 through a slot in an upper wall 34 of the housing towards the member 7, to which the upper end of the steel strip 33 is anchored.
  • the steel strip 33 compensates for the weight of the work support 2.
  • a latching device 37 which comprises the latching rod 8 and a latching lever 38 which extends transversely of the latching rod.
  • the latching lever 38 is made of a metal which is soft in comparison with the material of the rod 8.
  • the latching lever 38 has a hole 39 through which the rod 8 extends, the lever extending from the rod 8 through a slot 40 in an outward direction relative to the housing 20. The lower edge of the slot 40 constitutes a fulcrum for the lever 38.
  • the lever 38 is bent obliquely downwards, a leaf spring 41 ensuring that in the retaining position the lever 38 is urged into- an oblique position relative to the rod 8.
  • the oblique portion of the lever 38 is connected to an elastic hook 42, the hook engaging with an actuating rod 43, which rod is thus coupled to the hook 42 so as to be slidable in a horizontal direction.
  • the actuating rod 43 extends to a point near the upright sides of the work support 2, where the control levers 44 and 45 are located. Relative to the upright sides of the work support said control levers are arranged in such a manner that each individual control lever can be operated without special attention.
  • the control levers 44 and 45 are mounted so as to be pivotable about spindles 46, the rod 43 extending through portions of the lever which are situated at some distance from the spindle 46.
  • each lever is urged away from the work support 2 via the hook 42 and the actuating rod 43. This ensures that after release of the control levers 44 and 45 the rod 43 is pivoted in the direction indicated by the arrow A, so that the latching lever occupies the oblique position relative to the rod 8 as described hereinbefore.
  • the work support 2 is provided with a supporting bracket 47 which extends substantially perpendicularly relative to the major surface of the work support 2.
  • this bracket is provided with elastic material with a high surface-friction.
  • a part of the work support 2 which covers approximately 40% of its height reckoned from the support bracket 47 is preferably made of a non-transparent plastics material and an upper part of the work support is made of a transparent plastics material such as perspex.
  • On this upper part two magnetic strips 49 are arranged parallel to one another, the side of a bracket 50 which faces the work support being attracted against the magnetic strips.
  • the side of the bracket 50 which faces the supporting bracket 47 is also provided with an elastic material 51 with a high surface-friction.
  • This bracket 50 in combination with the bracket 47 serves as a flattening means for keeping pages of an open book in a flat condition.
  • a flattening device For the description of such a flattening device reference is made to the Applicant's Netherlands Patent Application No. 8200327 filed on 29 January 1982 and published on 16 August 1983.
  • the bracket 47 is formed with a slot, not shown, in which the parallelogram mechanism 11 can move up to the end of the slot upon a pivotal movement towards the work support 2. This limits pivotal movements of the parallogram mechanism 11 in an anticlockwise direction and moreover it provides a compact storage position of the parallelogram mechanism and the parts connected thereto. After the stand 9 has been swung out the reading apparatus is placed on a surface such as a table top, desk or bed.
  • the quick-connect coupling 16 enables the rectangular lens 17 to be readily interchanged with one which provides the required degree of magnification.
  • the parallelogram mechanism 11 enables the magnifying lens 17 to be adjusted as regards the distance from the work support, the lens being constantly maintained in a position parallel relative to the work support. This results in an easy adjustment of the focal distance of the lens relative to a record carrier placed on the work support, such as a book, a magazine or a newspaper. This focal distance must be adjusted in conformity with the thickness of the record carrier.
  • the pages of a book are kept in a flat condition between the brackets 47 and 50, the elastic material on the brackets ensuring that the pages cannot bulge. Thus, the entire page area remains free, enabling the entire page to be followed unimpededly with the lens 17.
  • the work support 2 is movable both in the vertical direction and in the horizontal direction, a user who is sitting on a chair with his eyes before the lens. 17 can move the work support 2 to the desired position without having to move his head. Since the user is generally visually handicapped, it is important that the work support 2 can be moved as easily as possible without tiring and intricate manipulations.
  • the horizontal displacement i.e. when following the lines of text, is effected very smoothly owing to the presence of the bearings 26 and 28.
  • the horizontally slidable coupling between the actuating rod 43 and the hook 42 ensures that the line-height setting is maintained.
  • the latching device 37 ensures that the housing 20 and the work support 2 carried by this housing cannot be lowered unintentionally, for example if the work support is subject to a shock.
  • the weight-compensation means comprising the steel strip 33 ensures that a smooth movement is obtained.
  • the user only has to pull one of the two control levers 44 or 45 slightly towards himself against spring force, the spring force itself being an indication to the user that the line height may change.
  • the special bearing arrangement of the housing 20 on the two tubes 3 and 4 guarantees that height adjustment proceeds very gradually yet smoothly.
  • the lever 44 or 45 must be released after which the line-height setting will be maintained.
  • the perspex upper part of the work support 2 ensures a minimal isolation of the user from his surrounding. Moreover, it is to be noted that in the swung-in condition the reading apparatus occupies a minimal space.

Landscapes

  • Facsimile Scanning Arrangements (AREA)
  • Tables And Desks Characterized By Structural Shape (AREA)

Claims (7)

1. Lesegestell mit einer Trägerplatte (2), die von einem Ständer (1) getragen wird und auf der ein Aufzeichnungsträger wie z.B. ein Buch oder eine Zeitschrift gelegt werden kann, und mit einer Linse (17), die am Ständer befestigt und deren Abstand zur Trägerplatte einstellbar ist, die in bezug auf den Ständer in vertikaler Richtung einstellbar is, wobei der Ständer zwei aufwärts gerichtete Längsführungen (3, 4) enthält, die für die vertikale Einstellung der Trägerplatte parallel zueinander verlaufen, wobei ein Gewichtsausgleich (33) zwischen dem Ständer und der Trägerplatte angeordnet und eine Verriegelung (8, 38) vorgesehen sind, die einen zwischen den Längsführungen befindlichen Verriegelungsstab (8) und einen Verriegelungshebel (38) enthält, der sich transversal zum genannten Stab erstreckt und mit einer Öffnung (39) versehen is, durch die der Stab hindurchgeht, und der Hebel mit einer Drehlagerung an der Trägerplatte befestigt und von einer Feder (41) in bezug auf den Stab in eine schiefe Lage gezwungen wird, dadurch gekennzeichnet, dass die Trägerplatte (2) auch in einer horizontalen Richtung in bezug auf den Ständer (1) verschiebbar ist, und der Verriegelungshebel (38) nahe bei dem vom Verriegelungsstab (8) entfernten Ende mit einem elastischen Haken (42) verbunden ist, der an einen Betätigungsstab (43) gekoppelt ist, um in bezug darauf in horizontaler Richtung schiebbar zu sein, und dieser Stab auf der Trägerplatte angeordnet und zumindest mit einem Steuerhebel (44, 45) nahe bei einer der lateralen Seiten der Trägerplatte befestigt ist.
2. Lesegestell nach Anspruch 1, dadurch gekennzeichnet, dass sich zwei Steuerhebel (44, 45) auf der Trägerplatte (2) befinden, und diese Steuerhebel nahe bei einer aufrechten Seite der Trägerplatte damit je in Drehlagerung befestigt sind, wobei sich der Betätigungsstab (43) zwischen den Steuerhebeln in einer horizontalen Richtung erstreckt.
3. Lesegestell nach Anspruch 1, dadurch gekennzeichnet, dass sich der Verriegelungshebel (38) zumindest teilweise in einem Gehäuse (20) befindet, das mit der Trägerplatte verbunden und zwischen den zwei Längsführungen (3, 4) angeordnet ist, wobei eine Wand (22) dieses Gehäuses mit einem Schlitz (40) versehen ist, dessen unterer Rand einen Drehzapfen für den Verriegelungshebel bildet.
4. Lesegestell nach Anspruch 3, dadurch gekennzeichnet, dass der Gewichtsausgleich eine Länge Bandstahl (33) enthält, der zumindest teilweise im Gehäuse (20) aufgewickelt wird, wobei der nicht-gewickelte Teil zwischen dem Gehäuse und dem Ständer nahe beim Verriegelungsstab zwischen den Längsführungen angeordnet ist.
5. Lesegerät nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass für die vertikale Führung der Trägerplatte das Gehäuse eine Anzahl Lagerungen (23, 24) enthält, die paarweise über und unter dem Verriegelungshebel (38) angeordnet sind und mit den Längsführungen (3, 4) während der Vertikaleinstellung der Trägerplatte zusammenarbeiten.
6. Lesegestell nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass das Gehäuse untere (26) und obere (28) Lager für die Horizontalführung der Trägerplatte in bezug auf den Ständer enthält, wobei der Hebel (38) zwischen den unteren und den oberen Lagern im Gehäuse (20) angeordnet ist.
7. Lesegestell nach einem oder mehreren der vorangehenden Ansprüche, mit einer Leuchte (14), deren Abstand vond er Trägerplatte einstellbar ist, dadurch gekennzeichnet, dass die Leuchte mit der unteren Fläche des Ständers (1) mittels eines drehgelagerten Parallelogrammechanismus (11) einstellbar verbunden und die Vergrösserungslinse (17) mit der oberen Seite der Leuchte verbunden ist.
EP19830201305 1982-09-13 1983-09-12 Lesegestell Expired EP0103341B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8203552A NL8203552A (nl) 1982-09-13 1982-09-13 Leeslessenaar.
NL8203552 1982-09-13

Publications (2)

Publication Number Publication Date
EP0103341A1 EP0103341A1 (de) 1984-03-21
EP0103341B1 true EP0103341B1 (de) 1986-05-07

Family

ID=19840264

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830201305 Expired EP0103341B1 (de) 1982-09-13 1983-09-12 Lesegestell

Country Status (3)

Country Link
EP (1) EP0103341B1 (de)
DE (1) DE3363412D1 (de)
NL (1) NL8203552A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112932067B (zh) * 2021-02-07 2022-12-06 云阳县沙市镇沙市小学 一种智能拉伸教学讲台

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE143193C (de) *
GB191229923A (en) * 1912-12-30 1914-01-30 Ignacz Kaufmann An Apparatus to Facilitate Reading.
US1451182A (en) * 1921-04-08 1923-04-10 Robert M Searle Reading appliance

Also Published As

Publication number Publication date
NL8203552A (nl) 1984-04-02
EP0103341A1 (de) 1984-03-21
DE3363412D1 (en) 1986-06-12

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