Abstract: A chair of modular construction having modules that form the basic chair with additional modules that can be added to the chair without changing the basic construction thereof.

Abstract: An ergonomic chair includes a four-bar linkage arrangement wherein a lower frame member is provided with a rigid front support and a rigid rear support with a seat member pivotably connected to the front support. A back rest has an upper support pivotably connected at an upper end of the rear support of the lower frame member. A link member pivotably connects at a first end to a rear support of the seat member and at second end to a lower support of the back rest. This novel arrangement permits tilting movement of the backrest rearwardly relative to the lower frame member causing elevation of a rear portion of the seat member, permitting the feet to remain on the floor and alleviating pressure on the user's thighs, while rotation occurs closely coincident with the pivot axis of the user's hips and while maintaining a generally uniform gaze line.

Abstract: In a first embodiment, a locking device for horizontal seat positioning of a chair seat has a friction pad or brake pad between the seat pan and the seat plate. A screw and spring assembly is used to resiliently hold the seat pan and seat plate together such that by lifting up on the forward portion of the seat pan, the friction brake is separated from the seat pan or the seat plate allowing the seat pan to be moved horizontally in the forwardly and rearwardly directions, thus adjusting the seat position. When the front of the seat pan is lifted substantially vertically, the screw and spring assembly is compressed to allow one of the seat plate and the seat pan to separate sufficiently from the brake pad and allow relative movement of the seat pan with respect to the seat plate.

Abstract: A chair of modular construction having modules that form the basic chair with additional modules that can be added to the chair without changing the basic construction thereof.

Abstract: A vertically and horizontally adjustable chair armrest is disclosed. The armrest includes an outer shroud, an upstanding support with a central opening and an armrest base. Within the central opening is a guide tube that moves vertically and has oppositely disposed slots. Within the guide tube, but mounted to rotate only, is a rod. At the lower end of the rod is a locking element that extends through the slots in the guide tube. The rod is rotated by a user pivoted lever bearing down on a spring biased activator nut. The nut is keyed to move only in a linear direction but is threaded to engage a mating thread on the rod, thereby causing the rod to rotate. When the locking element is rotated out of engagement with notches in the support opening, the armrest may be adjusted in a vertical direction. Releasing the lever allows the spring to bias the locking element into engagement with the notches to lock the armrest.

Abstract: A chair back upright rotates about a pivot axis with respect to a chair seat plate and has a protrusion on the bottom portion thereof. When the occupant of a chair reclines, the protrusion on the back upright and the stop make contact with each other. The contact stops the rotation of the back upright. The lever handle, fixedly attached to the stop, can be rotated thereby providing more or less rotation of the back upright before contacting the protrusion and the stop occurs.

Abstract: An adjustable chair seat with a locking mechanism is disclosed. The chair includes a seat pan, a seat plate and a torque limiting fastener. The seat pan and seat plate have openings for receiving the fastener which comprises a cup handle and a threaded insert. The threaded insert is engaged with the seat pan through an opening in the seat pan while the seat plate is sandwiched between the seat pan and the fastener. Once engagement is made, the fastener cannot be disengaged; and once a predetermined resistance is reached the cup handle slips relative to the threaded insert so as to cease the application of torque to the threaded insert.

Abstract: The specification describes and claims filled compositions, e.g. moisture curable sealant compositions which comprise 100 parts by weight of polymeric material comprising a mixture and/or a reaction product of a polydiorganosiloxane having silicon-bonded hydroxyl groups with a compound containing silicon-bonded alkoxy or alkoxyalkoxy groups, 50 to 200 parts by weight of finely divided filler and an additive which is a reaction product of an organic amine, an oxide, hydroxide, carbonate, bicarbonate or a mixture thereof with a sulphonic acid of the formula RSO.sub.3 H in which R represents a hydrocarbon group which may be halogenated. The additive is preferably a reaction product of the sulphonic acid and an oxide, hydroxide, carbonate or bicarbonate of magnesium, or calcium and the acid is preferably one in which R represents a group R'C.sub.6 H.sub.4 wherein R' represents an alkyl group having 6 to 18 carbon atoms, for example dodecylbenzenesulphonic acid.

Abstract: The specification discloses a curable composition comprising 100 parts by weight of polysiloxane, 50 to 200 parts by weight of finely divided filler having an average particle size greater than 0.05 micron and not less than 0.5 parts by weight per 100 parts by weight of the filler of an additive which is a reaction product of an organic amine, or an oxide, hydroxide, carbonate, or bicarbonate or a mixture thereof with a sulphonic acid of the formula RSO.sub.3 H in which R represents a hydrocarbon group which may have halogen or amino substituents and which contains not less than six carbon atoms. Preferred additives are reaction products of the sulphonic acid and an oxide, hydroxide, carbonate or bicarbonate of sodium, magnesium, zinc, calcium, barium, aluminium or a mixture thereof. The group R of the sulphonic acid may be R'C.sub.6 H.sub.4 where R' represents an alkyl group having 6 to 18 carbon atoms and a preferred acid is dodecylbenzenesulphonic acid.

Abstract: The specification discloses a method of preparing a polysiloxane by chain extension of a silicon compound having chain terminating units including a silicon-bonded hydroxyl group which comprises bringing about condensation of the silicon-bonded hydroxyl groups at a temperature of less than 50.degree. C. in presence of an acidic condensation catalyst of the formula RSO.sub.3 H and water, to an extent of less than 7 moles per mole of acidic condensation catalyst. The silicon compound may comprise a hydroxyl end-blocked polydimethylsiloxane having a viscosity at 25.degree. C. in the range 30 to 100,000 mm.sup.2 /s, and it may be polymerized to provide an .alpha.,.omega. dihydroxy polydimethylsiloxane having a viscosity in the range 1,000 mm.sup.2 /s to 100,000 mm.sup.2 /s or more. Preferred acidic condensation catalysts are those in which R is an alkyl group having a chain of 6 to 18 carbon atoms or a group R"C.sub.6 H.sub.

Abstract: The specification describes a method of preparing a polysiloxane including at least one siloxane unit having a silicon-bonded group --OX in which X is a saturated or unsaturated hydrocarbon group, for example methyl, alkenyl or alkynyl. The method comprises bringing about chemical reaction between a polymer having at least one siloxane unit having a silicon-bonded hydroxyl group and an alcohol of the general formula HOX in presnece of an acidic condensation catalyst of the formula (i) RSO.sub.3 H in which R represents an alkyl, aryl or alkaryl group which may be halogenated at a temperature of less than 50.degree. C. under conditions to cause condensation reaction between hydroxyl groups of the siloxane units and the alcohol.

Abstract: Composition comprising the product obtained by mixing (A) a silanol-terminated polydiorganosiloxane; (B) a silicon compound having at least 3 silicon-bonded alkoxy or alkoxyalkoxy groups in the molecule; (C) a metal or organometal salt of a carboxylic acid; (D) a silane having silicon-bonded alkoxy or alkoxyalkoxy groups and a silicon-bonded group, --R'NHR, in which R' is alkylene and R represents H, alkyl or an aliphatic hydrocarbon group containing at least one amino group, and (E) a silane having silicon-bonded alkoxy or alkoxyalkoxy groups and a silicon-bonded group containing an epoxy group.The compositions cure to elastomers having improved adhesion to glass, aluminium and concrete and are suitable for use as sealants for buildings.

Abstract: A composition which is curable in the presence of moisture to an elastomer having improved adhesion to certain substrates, especially concrete. The composition comprises the product obtained by mixing together (A) a polydiorganosiloxane having terminal silanol groups, (B) an alkoxysilane R.sub.a Si(OR').sub.4-a wherein R represents a monovalent hydrocarbon or halogenated hydrocarbon group having 1-6 carbon atoms, R' is a C.sub.1 to C.sub.4 alkyl group and a is 0 or 1, (C) an organic titanium catalyst, (D) a reinforcing or semi-reinforcing filler and (E) a polydiorganosiloxane gum having a plasticity number (ASTM Test D-926) in the range from 100 to 200.The compositions are particularly suitable for use as sealants for building structures.

Abstract: A composition curable to an elastomer in the presence of moisture obtained by mixing (A) a polydiorganosiloxane having terminal silicon-bonded hydroxyl groups; (B) a defined complex of titanium; and (C) an oxime silane crosslinking agent. The compositions may also contain conventional ingredients such as fillers, curing catalysts and polydimethylsiloxanes having terminal triorganosiloxy groups.The compositions are particularly suitable for use as low modulus sealants in building and glazing structures.