1. A method for preheating annealing goods in a hood-type annealing installation, comprising two annealing bases which accommodate the annealing goods under a protective cover, with the annealing goods to be subjected to a heat treatment under a protective cover being preheated with the help of a gaseous heat carrier which is guided in a cycle between two protective covers and absorbs heat from annealing goods which are heat-treated in a protective cover and emits it to the annealing goods to be preheated in the other protective cover, wherein the heat carrier flow guided in a cycle flows around the two protective covers on the outside, whereas a protective gas is circulated within the protective covers.
2. A hood-type annealing installation for performing the method according to claim 1 with two annealing bases accommodating the annealing goods under a protective cover, with circulating devices for a protective gas associated with the protective covers and cycle guidance for a gaseous heat carrier between the two protective covers, wherein the cycle guidance for the heat carrier is provided with one heat-insulated enclosure (9) each which encloses the two protective covers (7, 8) at a distance, and the two enclosures (9) are flow-connected with each other for the cycle guidance of the heat carrier.
3. A hood-type annealing installation for performing the method according to claim 1 with two annealing bases accommodating the annealing goods under a protective cover, with circulating devices for a protective gas associated with the protective covers and cycle guidance for a gaseous heat carrier between the two protective covers, wherein the cycle guidance for the heat carrier is provided with one heat-insulated enclosure (9) which encloses the two protective covers (7, 8) jointly and comprises at least one fan (12) for the cycle guidance of the heat carrier.
4. A hood-type annealing installation according to claim 3, wherein guide walls (13) for the cycle guidance of the heat carrier are provided within the enclosure (9).
5. A hood-type annealing installation for performing the method according to claim 1 with two annealing bases accommodating the annealing goods under a protective cover, comprising a heating cover (15) which can be placed over the protective cover and cycle guidance (10) for a gaseous heat carrier between the two protective covers, wherein the cycle guidance for the heat carrier comprises a heat-insulated enclosure (9) which encloses the protective cover (8) with the annealing goods (3) to be preheated and which is flow-connected with the heating cover (15) for cycle guidance of the heat carrier, which heating cover is placed over the protective cover (7) with the heat-treated annealing goods (4).
6. A hood-type annealing furnace according to claim 5, wherein the heat-insulated enclosure (9) is arranged like the heating cover (15).
7. A hood-type annealing furnace according to claim 5, wherein a guide device (20) for the heat carrier is provided between the enclosure (9) and the protective cover (8).
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of countering the effect of G-forces on a person comprising passing inflation gas to a bladder on a leg of a person by starting the inflation of the bladder to an operating pressure simultaneously from a point adjacent an ankle of the leg and at least one further point spaced from said point towards an abdomen of the person, said bladder when inflated to said operating pressure constricting the blood vessels of the leg.
2. A method according to claim 1 comprising locating the bladder between the ankle and the knee of the leg.
3. A method according to claim 1 comprising locating the bladder between the ankle and upper thigh of the leg.
4. A method according to claim 1 and comprising applying the inflation gas to an inlet to the bladder located towards said ankle.
5. A method according to claim 1 comprising extending the bladder around the whole circumference of the leg, and surrounding the bladder with an inelastic cover, inflation of the bladder expanding the bladder against the cover to constrict the blood vessels of the leg.
6. A method according to claim 1 comprising extending the bladder partially around the circumference of the leg and surrounding the bladder with an inelastic cover extending around the whole circumference of the leg, inflation of the bladder expanding the bladder to draw the cover against the leg to constrict the blood vessels of the leg.
7. A method according to claim 1 and comprising maintaining in said bladder a residual pressure less than said operating pressure to reduce the time taken to reach said operating pressure on inflation to counter G-forces.
8. A method according to claim 1 and comprising passing inflation gas to the bladder through a tube extending from a waist of the person to said point closer to said ankle.
9. A method according to claim 8 comprising passing the tube through the bladder.
10. A method according to claim 8 comprising passing the tube externally of the bladder.
11. A method according to claim 1 wherein inflation gas is passed to said point adjacent the ankle at a flow rate different from the flow rate of gas to said at least one further point.
12. A method according to claim 11 wherein the flow rate of inflation gas to said ankle point is greater than the flow rate of inflation gas to said at least one further point.