baber/WOPTO huggingface dataset:
Patent EP-0008293-A1 (EP)
Inventor: GODEL SIEGFRIED
IPC: A45D20/12
Filed: 1979-07-03
Abstract: Un seche-cheveux electrique qui comprend une poignee supportant une enceinte en forme d'aile, comporte un ventilateur axial (53) mu par un moteur porte par la paroi arriere de l'enceinte. Une entree d'air (41) est prevue dans la paroi arriere de l'enceinte par ou un courant d'air cree par le ventilateur entre dans l'enceinte et la traverse. Le courant d'air sort a travers une ouverture de decharge allongee formee dans la paroi avant, en forme d'arc, de l'enceinte. Une partie interieure (44) de la paroi arriere (42) de l'enceinte adjacente a l'entree d'air, est plane et s'etend dans un plan substantiellement normal a l'axe de rotation du ventilateur, et une partie (54B) du ventilateur fait saillie au-dela de la partie plane (44) en direction de l'ouverture de decharge. La forme et l'emplacement de la partie interieure (44) de la paroi arriere adjacente a l'entree d'air et la partie qui fait saillie (54B) du ventilateur au-dela de la partie plane (44) font que non seulement le courant d'air cree par le ventilateur se deplace en avant vers l'ouverture de decharge mais egalement qu'une partie de cet air se deplace aussi bien le long de la paroi arriere de l'enceinte que vers la paroi avant. De cette facon, l'air qui sort de l'ouverture de decharge presente un gradient de vitesse egal ou uniforme au travers de la sortie de decharge. Un chauffage de l'air est prevu avant que celui-ci ne traverse l'ouverture de decharge.
Patent EP-0016900-A1 (EP)
Inventor: KOCSIS KAROLY DR
IPC: A61K31/545
Filed: 1978-07-11
Abstract: Carbonsäure-Verbindungen der Formel <IMAGE> worin der Index n eine ganze Zahl von 1 bis 4, der Index m 0 oder 1, X Sauerstoff, Schwefel oder die Gruppe -NH-, W eine Gruppe -CO-, -CO-NHSO2- oder -SO2NH-CO-, oder X-W zusammen eine Gruppe -CO- oder -CO-NHSO2-, A gegebenenfalls substituiertes Phenylen, Thienylen oder Furylen, Y Wasserstoff, Hydroxyl, Formyloxy, Amino oder gegebenenfalls in Salzform vorliegendes Sulfo und Z Wasserstoff, oder Y und Z zusammen eine Oxogruppe oder eine Gruppe =N-O-R°, worin R° Wasserstoff oder gegebenenfalls substituiertes Niederalkyl darstellt, und worin die Aminocarbonsäuregruppierung HOOC-CH(NH2)- und gegebenenfalls in der Gruppierung -A-(Y)(Z)- vorhandene weitere funktionelle Gruppen in geschützter Form vorliegen, und ihre zur Acylierung geeigneten reaktionsfähigen Derivate, sowie Verfahren zu ihrer Herstellung. Die Verbindungen eigner sich zur Herstellung von neuen Cephalosporinderivaten, worin die 7β-Aminogruppe durch die Acylgruppen dieser Carbonsäurederivate acyliert sind.
Patent EP-0014488-A1 (EP)
Inventor: VAN HEEK KARL HEINRICH DR
IPC: C10J3/14
Filed: 1980-01-14
Abstract: Die Erfindung betrifft ein Verfahren zur Erzeugung von H 2 - und CO-haltigen Gasen, bei dem feinkörnige Kohle oder Koks mit Dampf in einerWirbeischicht unter Erhitzung mittels in die Wirbelschicht eingetauchter, von einem gasförmigen Medium durchflossenen, Wärmetaucher in einer Vergasungszone teilvergast und der Rückstandskoks in einer nachgeschalteten Verbrennungszone in einer mit Luft angeströmten Wirbelschicht verbrannt wird, wobei das derVergasungszone zuströmende abgekühlte Medium wieder erhitzt, während das in derVergasungszone abgekühlte Medium im Kreislauf über den Wärmetaucher geführt wird. Der Vergasungszone kann eine mit Dampf betriebene Wirbelschicht als Entgasungszone vorgeschaltet sein. Die Wirbelschichten werden bei einem Gasdruck von 5 -60 bar, in der Entgasungszone bei 700 - 870°C und in der Verbrennungszone bei 900 - 1050° C betrieben.
Patent EP-0015606-A1 (EP)
Inventor: BURLEY JOSEPH WILLIAM
IPC: C07F7/22
Filed: 1980-02-21
Abstract: Bis-(cyanoethyl) tin dihalides are prepared by reacting metallic tin with acrylonitrile and hydrogen halide in an inert solvent; the halides being chlorides or bromides.
Patent EP-0017397-A1 (EP)
Inventor: THELWALL LESLIE ANTHONY WILLIA
IPC: C07H5/02
Filed: 1980-03-20
Abstract: Novel sugar acetals such as those of formula
     where R a  is hydrocarbyl; R b  and R c  are hydrogen or hydrocarbyl; R 3 , R 4  and R 6  are hydrogen or R 4  with R 3  or R 6  is
     are made from 1,4-linked reducing disaccharides by a new exchange acetalation process in which the solvent is omitted. The sugar acetals have free hydroxy groups on the ring which groups can be converted to other substituents, e.g. chlorodeoxy or fatty acid acyl. After deprotection the corresponding derivative of the initial disaccharide is obtained.
Patent EP-0024111-A1 (EP)
Inventor: HODES GARY
IPC: H01L31/0296
Filed: 1980-07-07
Abstract: A photovoltaic system may comprise a Cd(SeTe) alloy junction-forming material, preferably as a photoelectrode. A photoelectrode suitable for use in a photovoltaic system may comprise a Cd(SeTe) alloy. A semiconductor suitable for use as a photoelectrode may be made by a method comprising electrodepositing Cd(SeTe) onto a substrate followed by heat treatment or by applying a slurry providing Cd(SeTe) and then annealing the slurry.
Patent EP-0028093-A1 (EP)
Inventor: POLLOCK DAVID CARLETON IRVING
IPC: C02F3/22
Filed: 1980-10-14
Abstract: in a long vertical shaft activated sludge bioreactor (1,2) for the treatment of waste water and the flotation/separation of solids therefrom, an improvement is provided whereby fluctuations in flow through the bioreactor are maintained level without the use of complex control mechanisms and whereby separation from the effluent of dispersed air bubbles occurs directly in the flotation/separation vessel (12) rather than in the shaft or an auxiliary vessel. The improvement provides for the installation of a holding reservoir (5) between the shaft and the flotation/separation vessel. Influent passes through the reservoir on its way to the bioreactor and some make-up effluent from the flotation/separation vessel is directed into the holding reservoir as the level of liquid in the reservoir falls. In addition, means (13,14) are provided in the separation/flotation vessel to split off large dispersed gas bubbles which would otherwise disrupt sludge flotation.
Patent EP-0033341-A1 (EP)
Inventor: WEST CHARLES R
IPC: C07H19/10
Filed: 1981-02-24
Abstract: On fait reagir des nucleotides de nucleosides ou bases ayant une activite cytotoxique connue avec des steroides, de preference des corticosteroides, pour former des produits analogues aux phosphodiesters de nucleosides-corticosteroides cytotoxiques de formule: steroide-O-P-O-sucre-heterocycle (FORMULE) ou le steroide est le residu forme par extraction d'un atome d'hydrogene hydroxyle a partir d'un corticosteroide adrenal naturel ou synthetique contenant le noyau caracteristique cyclopentanophenanthrene qui est esterifie a la moitie de phosphate en position 21; le sucre est un pentose ou deoxypentose se produisant naturellement sous la forme de furanose, de preference ribose, desoxyribose, lyxose, xylose ou arabinose et specialement ribose, desoxyribose ou arabinose, qui est esterifie a la moitie de phosphate en position (5') et lie par covalence a la moitie de l'etherocycle en position (1') pour former un nucleoside; et l'heterocycle est une purine, pyrimidine, pyrimidine hydrogenee, triazolopurine ou base nucleoside similaire. Les conjugues ont un meilleur index therapeutique en comparaison des composes nucleosides ou bases de la meme famille, et sont donc utiles comme agents cytotoxiques, antiviraux et antineoplastes.
Patent EP-0043472-A1 (EP)
Inventor: BETZING HANS DR
IPC: C07F9/09
Filed: 1981-06-17
Abstract: The present invention is directed to new 1-S-alkyl-2-O-acyl-3-phosphocholine-1-mercapto-2.3-propandiols of the general formula I
     process for producting the same and pharmaceutical preparations containing the same as active agent, in particular for the treatment of increased blood pressure and thromboembolic diseases.
Patent EP-0045888-A1 (EP)
Inventor: BARLIAN REINHOLD
IPC: G01M3/16
Filed: 1981-07-25
Abstract: Die Einrichtung dient zur Feststellung von Leckagen in Dampf enthaltenden Hohlkörpern, insbesondere Rohren (26). Sie wird zur Überwachung von Heißdampfleitungen eingesetzt. Der Hohlkörper ist von einer Wärmeisolierung (24) umgeben, die einen Meßraum (28) enthält. Im Meßraum befindet sich ein Temperaturfühler (32) und mindestens ein Dampfdetektor (9). Ein Auswertgerät spricht an, wenn gleichzeitig die Anwesenheit von Dampf und ein Temperaturabfall festgestellt werden. Tritt Dampf, der sich in dem Hohlkörper oder Rohr unter Überdruck befindet, durch ein Leck aus, so entspannt er sich, wobei seine Temperatur abfällt. Durch die Messung der beiden Effekte, nämlich Temperaturabfall und Anwesenheit von Dampf werden Fehlmeldungen vermieden.
Patent EP-0050748-A1 (EP)
Inventor: STREHL HERBERT DIPL-ING
IPC: H04M11/06
Filed: 1981-10-01
Abstract: An analog/digital telecommunication subscriber station is connectible to a two-wire line and comprises a frequency multiplexer and a frequency demultiplexer for grouping and fanning an analog communication channel covering the telephone band and a digital communication channel lying above the telephone band. The station further comprises a hybrid for connecting the two-wire line into a four-wire line. The subscriber station is particularly characterized in that the two-wire line is terminated by a broad-band hybrid which is proceeded in the transmission branch by a frequency multiplexer which groups at least the analog communication channel covering the telephone band and the digital communication channel lying thereabove, and is followed in the receiving branch by a frequency demultiplexer which fans at least the analog communication channel covering the telephone band and the digital communication channel lying above the telephone band. Various embodiments provide analog telephone operation, digital telephone operation, fast data operation, slow data operation, picture telephone service and a combination of analog and digital two-party line as various options.
Patent EP-0054993-A1 (EP)
Inventor: WETERINGS CORNELIS ANTONIUS MA
IPC: C01F17/229
Filed: 1981-12-10
Abstract: Recovery of yttrium, lanthanides and radium free calcium sulphate in a phosphoric acid process by digesting phosphate rock with an excess of phosphoric acid in the presence of more than about 5 wt.% of SO4-ions calculated to the amount of phosphate rock, separating out the insoluble residue and recovering yttrium and lanthanides therefrom, precipitating calcium sulphate from the remaining solution with sulphuric acid and separating this calcium sulphate from the resulting phosphoric acid solution.
Patent EP-0044629-A1 (EP)
Inventor: BELLIS HAROLD EDWARD
IPC: B01J27/08
Filed: 1981-06-26
Abstract: Substituted formamides such as dimethyl formamide prepared by the catalytic oxidation of tertiary methyl-amines, in which the catalyst is cupric chloride or other metal halide used in conjunction with an alkali metal halide or ammonium halide adjunct. The use of the adjunct increases the solubility of the corrosive catalyst in the reaction medium, reducing the corrosion effects of the process on reaction equipment, and can also enhance selectivity.
Patent EP-0044165-A1 (EP)
Inventor: BRINT NORMAN TREVOR
IPC: F41A9/02
Filed: 1981-06-29
Abstract: A firearm especially for firing large calibre rounds such as rubber bullets and having a rotary magazine (2) which is rechargeable at any stage of depletion. A loading (63) arm serves to guide rounds through an inlet opening in the magazine (2), in such a way that they are received into corresponding locations in a rotating carrier (46,47), and the carrier rotates forward one position with each additional round. Until the penultimate round, the guide means (63, 64, 65) is locked to the magazine body (40). In this position, it obstructs further movement of the first-inserted round and thus prevents insertion of the final round. Mechanism is described by which, on insertion of the final round the guide means automatically unlocks from the magazine body and locks to the rotating carrier. In this condition it serves to keep the first inserted round locked in the magazine as it completes a full rotation to come opposite the inlet opening once more. Mechanism for firing automatic indexing the carrier, and automatic extraction and ejection of spent cartridges is described.
Patent EP-0050399-A1 (EP)
Inventor: SHINDO MIZUO
IPC: D01F6/04
Filed: 1981-07-09
Abstract: Porous hollow fibers composed of a high density polyethylene the fibers having rectangular micropores that are oriented in the lengthwise direction of the fibers and having a porosity from 30 to 90% by volume are disclosed. Membranes composed of hollow fibers exhibit a water permeability of greater than 65 (ml/m 2 , hr, mmHg) as well as a human serum albumin permeability of greater than 30%. Such fibers are suited for use as filters, particularly as a membrane for simple fractionation of whole blood into its plasma and cellular components. The hollow fibers are obtained by spinning a high-density polyethylene under a high-draft condition followed by cold stretching and hot stretching, and without the use of any solvent or plasticizer.
Patent EP-0048143-A1 (EP)
Inventor: LEVITT GEORGE
IPC: A01N47/36
Filed: 1981-09-11
Abstract: Compounds of the formula 
<CHEM>
 wherein R1 is H, C1-C3 alkyl or OCH3;
 R2 is H or C1-C3 alkyl;
 R3 is 
<CHEM>
 R4 is C1-C3 alkyl;
 R5 is H, F, Cl, Br, NO2, CH3, OCH3 or CF3; X is CH3, C2H5, CH2OCH3, C1-3 alkoxy, OCH2CH2OCH3, CF3 or SCH3;
 Y is CH3 or OCH3; and
 Z is CH orN;
 and their agriculturally suitable salts, provided that R1 and R2 are not both H, exhibit activity as general and selective herbicides and as plant growth regulants. For such uses the compounds may be formulated into compositions in conventional manner. 
<??>The novel compounds may be made by reacting together corresponding compounds of formulae R3SO2NCO and 
<CHEM>
 wherein R1, R3, X, Y and Z are as defined above.
Patent EP-0042786-A1 (EP)
Inventor: IRO FRANCIS
IPC: B25B25/00
Filed: 1981-06-16
Abstract: 1. Tool, in particular portable tool, for fitting a clamp constituted by a hand (5) comprising a first stop member (7), a second stop member (8) which is tearable upon clamping, said tool comprising a shoe (1a) abutting on the first stop member (7) of the clamp and a movable member (3) sliding with respect to the shoe (1a) and adapted to exert a tension on the band, characterized in that the said movable member (3), which is preferably coupled to a motor element such as for example pneumatic jack, is provided at its active end with a hinged nosepiece (10) presenting a shoulder (10a) which comes into contact with the second stop member (8) of the clamp during the displacement of the movable member and which causes tearing of the said second stop member when the tensile stress reaches an adequate value.
Patent EP-0070951-A1 (EP)
Inventor: SCHMIDT ADOLF
IPC: B65G7/08
Filed: 1981-07-31
Abstract: 1. Roll tipper (1, 2) for the tipping-over of roll-shaped articles (7), for example rolls of paper or the like, from a position wherein the roll axis is horizontal to a position with the roll axis vertical, or vice versa, with a tipping frame (3) which comprises a reception plate (4) and a delivery plate (5) attached to the said reception plate at right angles thereto and which is pivotable, about an axis of pivoting situated in the region of the connection between reception plate and delivery plate, by means of at least one main hydraulic cylinder (11) producing a tipping moment, characterised in that at least one additional hydraulic cylinder (15) is provided for producing an opposing torque which is in the opposite direction to the tipping moment but is not as great, and the direction and amount of the force produced by the additional hydraulic cylinder (15) are so designed that the horizontal forces acting on the pivoting axis (22) are reduced, preferably eliminated.
Patent EP-0046803-A1 (EP)
Title: Procede de production de courant electrique pendant des periodes de pointe de demande d'energie
Inventor: SUMMERS WILLIAM A
IPC: F01K21/04
Filed: 1981-02-25
Abstract: Pour satisfaire la demande en energie electrique pendant les periodes de pointe, on utilise une unite a turbine generatrice (60-61) actionnee par la detente d'air comprime, aspire depuis un reservoir de stockage d'air souterrain (90), dans un systeme sensiblement isothermique. Un systeme generateur, qui peut comprendre une chaudiere a vapeur (40) ou un gazeificateur de combustible (140), est utilise pour la compression isothermique d'air dans un reservoir de stockage pendant des periodes de faible demande en energie.
Patent EP-0053186-A1 (EP)
Inventor: ASAYAMA YOSHIAKI
IPC: F02D41/34
Filed: 1981-04-23
Abstract: Since an injection frequency of an engine is low and the idling operation of the engine becomes unstable in the case where fuel is supplied in synchronism with a Karman vortex generation frequency, the idling operation of the engine is stabilized by designing it to set the Strouhal number at a predetermined value.
Patent EP-0060863-A1 (EP)
Inventor: SCHUPACK MORRIS
IPC: E04C5/08
Filed: 1981-09-16
Abstract: Une enveloppe d'ancrage isolee electriquement (41) est destinee a un assemblage de "tendon" de renforcement (21) dans une structure en beton (24). L'enveloppe (41) s'etend autour de l'ancrage du "tendon" (23) et est montee de maniere isolee sur une conduite (32) positionnee sur un "tendon" de renforcement allonge (22) de maniere a isoler electriquement l'assemblage a "tendon" (21) de la structure en beton (24). Plusieurs configurations d'enveloppes (41), (74), (104), (126) peuvent recevoir differents ancrages de "tendon" (23), (76), (109), (124). Un procede d'isolation electrique d'un assemblage a "tendon" de renforcement (21) d'une structure en beton (24) est egalement decrit.
Patent EP-0058967-A1 (EP)
Inventor: TAKAHASHI KOTEI
IPC: G01D5/04
Filed: 1982-02-19
Abstract: A speedometer drive worm gear (22) has at one axial end thereof an inward flange (22a) of a thickness considerably smaller than the overall thickness of the worm gear. The speedometer drive worm gear (22) is mounted on a differential case (18) and held axially in place by abuttingly engaging the opposed side surfaces of the inward flange with a shoulder (18c) formed in the differential case and the inner race (24a) of a differential case bearing (24) by way of a stopper (26).
Patent EP-0061754-A1 (EP)
Inventor: DAEUBLE HERBERT
IPC: G06K15/22
Filed: 1982-03-27
Abstract: The apparatus has X-Y drawing devices and is constructed as a carriage-type drafting machine (10), in which a scriber holder (26) is directly connected to the drafting head holder (24), the X-Y coordinates of which scriber holder can be recorded by position recording devices, memory devices (12) being provided in order to store the position data, control devices (12, 14) also being provided, by means of which movements of the scriber holder in relation to the drafting board (30) can be recorded in digital form and by means of which, on the other hand, the scriber holder can be released for relative movements in relation to the drafting board depending on coordinate data which have been stored and/or input using a keyboard. <IMAGE>
Patent EP-0073372-A1 (EP)
Inventor: NISHIYAMA RYUZO
IPC: B01J23/42
Filed: 1982-08-11
Abstract: A process for producing 2,6-difluorobenzonitrile comprises reducing a chloro fluorobenzonitrile selected from 3- chtoro-2,6-difluorobenzonitrile, 3,5-dichloro-2,6-difluorobenzonitrile or a mixture thereof by hydrogen gas in the presence of a palladium or platinum catalyst at a temperature of 0 to 200 °C.
Patent EP-0074515-A1 (EP)
Inventor: LORENZ MANFRED DR
IPC: C09B63/00
Filed: 1982-08-21
Abstract: Verbindungen, die in einer ihrer tautomeren Strukturen der Formel <IMAGE> entsprechen, in der die mit X und Y bezeichneten Ringe je einen oder zwei Substituenten aus der Reihe =O, =S, =NR7, -NR6R7, -OR6, -SR6, -COOR6, -CN, -CONR6R7, -SO2R8, <IMAGE> Alkyl, Cycloalkyl, Aryl, Aralkyl tragen können, wobei die Summe der endo- und exocyclischen Doppelbindungen für jeden der Ringe X und Y drei ist, R6 für Wasserstoff, Alkyl, Cycloalkyl, Aryl oder Aralkyl und R7 für Wasserstoff, Cyan, Alkyl, Cycloalkyl, Aryl, Aralkyl oder Acyl stehen und R8 Alkyl, Cycloalkyl, Aryl oder Aralkyl bezeichnet, R1, R2, R3, R4 für Wasserstoff, Alkyl, Cycloalkyl, Aryl oder Aralkyl stehen und weiterhin, wie in Formel I durch die unterbrochenen Linien angedeutet wird, 5- oder 6-gliedrige Ringe ausbilden können, an die weitere Ringe ankondensiert sein können, R5 -OH, -NR6R7, Alkyl, Cycloalkyl, Aryl oder Aralkyl bezeichnet, wobei die für R1-R8 genannten CH-Bindungen enthaltenden Substituenten ihrerseits substituiert sein können und m,n,o,p 1 oder für den Fall, daß von den Ringstickstoffatomen Doppelbindungen ausgehen, wie in Formel I durch die punktierten Linien angedeutet wird, auch O bezeichnen können.
Patent EP-0075219-A1 (EP)
Inventor: GAST THEODOR PROF DR-ING
IPC: F16K31/08
Filed: 1982-09-10
Abstract: Das Magnetventil weist zwei zylindrische parallel zueinander angeordnete Weicheisenkerne (4, 5) auf. Die Weicheisenkerne sind jeweils von einer Spule (10, 11) umgeben. Innerhalb der Weicheisenkerne wird ein Anker (9) aus magnetisch leitendem Material bewegt, der einen Ventilkörper (16) trägt. Zwischen den zwei Spulen ist kreisringförmig ein axial magnetisierter Permanentmagnet (1) angeordnet. Die Weicheisenkerne weisen einen sie miteinander verbindenden magnetischen Rückschluss auf.
Patent EP-0084611-A1 (EP)
Inventor: ASCHER GERD
IPC: C07D501/32
Filed: 1980-04-17
Abstract: The invention provides a novel method for producing phenyiglycyl chloride hydrochlorides involving reaction of N-substituted phenylgiycines with for example thionyl chio- ride and then gaseous hydrogen chloride, as well as certain novel starting materials for use in this process and certain end-products thereby produced.
Patent EP-0059059-A1 (EP)
Title: Zeolites
Inventor: WHITTAM THOMAS VINCENT
IPC: B01J29/86
Filed: 1982-02-16
Abstract: A synthetic zeolite material, designated zeolite Nu-13, is a member of the ZSM-12 family of zeolites and is prepared from an aqueous reaction mixture containing the oxide X0 2 , the oxide Y 2 0 3  and a piperazine compound where X is silicon or germanium and Y is aluminium, gallium, boron, iron, chromium, vanadium, molybdenum, arsenic, antimony or manganese.
Patent EP-0072134-A1 (EP)
Title: Drive tensioning device
Inventor: HEATER RICHARD WILLIAM
IPC: F16H7/08
Filed: 1982-07-23
Abstract: A belt tensioning device (23) is provided for maintaining nominal tension in an endless power transmission belt (11). The tensioning device includes a fixed portion (25), a relatively rotatable portion (27), a biasing spring (29) and a tensioner pulley (31) which engages the belt. The spring biases the rotatable portion and the tensioner pulley against the belt to maintain the nominal belt tension. The fixed portion includes a disk member (65), and the rotatable portion defines an annular chamber (69), concentric with the disk member to define a shear space therebetween. The shear space is filled with viscous fluid, such that movement of the tensioner pulley and rotatable portion generates a viscous shear drag which resists such rotation. The resisting torque is generally a function of the relative velocity of the fixed and rotatable portions, or of the frequency of movement of the rotatable portion. The resisting torque required for any particular engine application may be selected by varying factors such as the shear area defined by the tensioning device, or the viscosity of the fluid in the shear space.
Patent EP-0058643-A1 (EP)
Inventor: DE THIER JEAN
IPC: A47C21/00
Filed: 1982-02-16
Abstract: The bracket is intended to allow a person in bed for medical reasons, to execute, without any extra help, the following motions: to sit up again on her bed, to sit on the edge of the bed, to stand up, to make a few steps and sit on a seat. It comprises one arm (14) intended to be used as a turning support for the person in bed, mounted by means of a set of tubes (10, 11, 12) engaged telescopically into each other, on a base (24) laid on the ground next to the bed. The arm (14) may be moved by the person in bed, against a certain resistance, between an angular position for which it is above the bed, and an angular position for which it is away from the bed.