摘要:
A tyre (3) for vehicles, which does not require pressurisation by means of a pressurised fluid, has a tread (16), two sidewalls (15), and two beads (8) attached to a wheel rim (2) and made of elastomer material; the tyre is provided with at least one tubular reinforcement body (18) which is associated with the tread; each of the sidewalls have a respective homogeneous resilient annular membrane (24).
摘要:
A tire for vehicles which does not require pressurization by means of a pressurized fluid has a tread, two sidewalls, and two beads which are attached to a wheel rim made of elastomer material, and is provided with at least one tubular reinforcement body which is associated with the tread; each of the sidewalls having a respective homogeneous resilient annular membrane, a straight generatrix of which forms an angle (A) other than 90° with the axis of the tire; the membranes being stretched radially between the tread and the beads such as to be pre-tensioned in the absence of external loads acting on the tire.
摘要:
A tyre for vehicles which does not require pressurisation by means of a pressurised fluid has a tread, two sidewalls, and two beads which are attached to a wheel rim made of elastomer material, and is provided with at least one tubular reinforcement body which is associated with the tread; each of the sidewalls having a respective homogeneous resilient annular membrane, a straight generatrix of which forms an angle (A) other than 90° with the axis of the tyre; the membranes being stretched radially between the tread and the beads such as to be pre-tensioned in the absence of external loads acting on the tyre.
摘要:
A tire (3) for vehicles, which does not require pressurization by means of a pressurized fluid, has a tread (16), two sidewalls (15), and two beads (8) attached to a wheel rim (2) and made of elastomer material; the tire is provided with at least one tubular reinforcement body (18) which is associated with the tread; each of the sidewalls have a respective homogeneous resilient annular membrane (24).
摘要:
A tyre (3) for vehicles which does not require pressurisation by means of a pressurised fluid has a tread (16), two sidewalls (15), and two beads (8) which are attached to a wheel rim (2) made of elastomer material, and is provided with at least one tubular reinforcement body (18) which is associated with the tread; each of the sidewalls having a respective homogeneous resilient annular membrane (24), a straight generatrix of which forms an angle (A) other than 90° with the axis (13) of the tyre (3); the membranes (24) being stretched radially between the tread (16) and the heads (8) such as to be pre-tensioned in the absence of external loads acting on the tyre (3).
摘要:
A safety barrier for road use comprises a barrier element (5) which can be displaced between an operative position, above the road surface, and an inoperative position, in which it does not substantially project above the road surface. Preferably provided is a number of sets of aligned barrier elements, rigidly connected to one another, the adjacent sets being connected together by articulated connecting structures (18) which enable one set of barrier elements (5) to be displaced between its inoperative position and its operative position without modifying the positions of the adjacent sets. In this way, one or more stretches of the barrier can be brought into the inoperative condition, leaving the adjacent stretches of barrier in the normal operative condition. The invention is particularly, although not exclusively, suited for the construction of traffic-divider barriers in road tunnels where it is necessary to eliminate the barrier rapidly in the event of an accident occurring.
摘要:
The device is adapted to control the movement of a valve (1) of an internal combustion engine comprising a stem (1a) which may move in translation through an opening (2a) of a hollow guide body (2) and which ends in a mushroom head (1b) cooperating in operation with a valve seat (12) provided in a wall (13) of the engine head. The valve (1) may move in translation with respect to the hollow guide body (2) between a retracted position and a forward position in which the mushroom head (1b) respectively closes and opens the associated valve seat (12).The control device comprises an electromagnet (3) adapted, when energised, to retain the valve (1) in the retracted closed position, a first spring (7) associated with the valve (1) and tending to urge it towards the open position, and a second spring (8) also associated with the valve (1) and tending to oppose its transition into the open position. The arrangement is such that when the electromagnet (3) is de-energised, the valve (1) moves in acceleration towards the open position under the action of the first spring (7) until the action of the latter stops, and then the valve (1) moves in deceleration into the open position under the action of the second spring (8).
摘要:
A safety barrier for road use comprises a barrier element which can be displaced between an operative position, above the road surface, and an inoperative position, in which it does not substantially project above the road surface. Preferably provided is a number of sets of aligned barrier elements, rigidly connected to one another, the adjacent sets being connected together by articulated connecting structures which enable one set of barrier elements to be displaced between its inoperative position and its operative position without modifying the positions of the adjacent sets. In this way, one or more stretches of the barrier can be brought into the inoperative condition, leaving the adjacent stretches of barrier in the normal operative condition.
摘要:
The device is adapted to control the movement of a valve (1) of an internal combustion engine comprising a stem (1a) which may move in translation through an opening (2a) of a hollow guide body (2) and which ends in a mushroom head (1b) cooperating in operation with a valve seat (12) provided in a wall (13) of the engine head. The valve (1) may move in translation with respect to the hollow guide body (2) between a retracted position and a forward position in which the mushroom head (1b) respectively closes and opens the associated valve seat (12).The control device comprises an electromagnet (3) adapted, when energised, to retain the valve (1) in the retracted closed position, a first spring (7) associated with the valve (1) and tending to urge it towards the open position, and a second spring (8) also associated with the valve (1) and tending to oppose its transition into the open position. The arrangement is such that when the electromagnet (3) is de-energised, the valve (1) moves in acceleration towards the open position under the action of the first spring (7) until the action of the latter stops, and then the valve (1) moves in deceleration into the open position under the action of the second spring (8).
摘要:
A method is described for the non-destructive testing of a joint obtained by the electrical spot-welding of two sheets of substantially the same material joined together in a local zone with the formation of a weld core which has a thermal diffusivity substantially different from the thermal diffusivity of the material of the two sheets before welding, such a core being obtained only when the welding is of a good quality.The testing is effected by a device the main characteristic of which is an electrode which delivers heat and a detector electrode located at two conveniently chosen points on one surface or opposite surfaces of the two welded sheets. The detector electrode is connected through an amplifier and an analog-digital converter to a computer which processes the signal to provide an indication of the weld quality on the basis of the measured value of the thermal diffusivity.