Claims
- 1. A ventilating arrangement for a shoe, comprising:
- (a) a sole having an air inlet in constantly open communication with the interior of the shoe, an air outlet in constantly open communication with the exterior of the shoe, and a constantly open passage extending along a flow path from the inlet to the outlet, said passage having a constantly open mixing chamber between the inlet and the outlet, and a predetermined flow-through cross-section;
- (b) at least one throttle orifice formed in the sole and being in constantly open communication with the mixing chamber, and facing downstream of the passage into the mixing chamber, said one throttle orifice having a flow-through cross-section smaller than said predetermined cross-section of the passage; and
- (c) foot-operated pumping means on the sole for forcing a low volume of primary air through said one throttle orifice into the mixing chamber at high velocity downstream of the passage to create within the mixing chamber a low pressure zone into which is accelerated a high volume of secondary air entering the inlet from the shoe interior, said secondary air being forcefully drawn by, and mixed with, the primary air in the mixing chamber to form an air stream mixture that is forcefully conveyed away from the mixing chamber and expelled from the outlet, said high volume of secondary air being many times greater than said low volume of primary air due to the primary air imparting its high velocity energy to the secondary air which induces the secondary air to flow into the mixing chamber.
- 2. The arrangement according to claim 1, wherein the sole is an insole removably mounted within the shoe.
- 3. The arrangement according to claim 1, wherein the air inlet comprises a plurality of inlet holes extending into the passage.
- 4. The arrangement according to claim 1, wherein the passage extends along the perimeter of the sole at one side of the sole.
- 5. The arrangement according to claim 1, wherein additional throttle orifices are formed in the sole and are in open communication with, and face downstream of, the passage.
- 6. The arrangement according to claim 5, wherein the orifices are located at the heel portion.
- 7. The arrangement according to claim 5, wherein the orifices extend through walls which are in mutual parallelism.
- 8. The arrangement according to claim 1, wherein the sole has a toe portion formed with said inlet, and a heel portion formed with said outlet.
- 9. The arrangement according to claim 5, wherein the orifices are successively arranged along the passage.
- 10. The arrangement according to claim 1, wherein the pumping means includes a heel strike portion overlying and inclined relative to the sole, and a return spring between the strike portion and the sole.
- 11. A method of ventilating a shoe, comprising the steps of:
- (a) forming a sole with an air inlet in constantly open communication with the interior of the shoe;
- (b) forming the sole with an air inlet in constantly open communication with the exterior of the shoe;
- (c) forming in the sole a constantly open passage which extends along a flow path from the inlet to the outlet, said passage having a mixing chamber between the inlet and the outlet, and a predetermined flow-through cross-section;
- (d) forming in the sole at least one throttle orifice in constantly open communication with the mixing chamber, and facing downstream of the passage into the mixing chamber, said one throttle orifice having a flow-through cross-section smaller than said predetermined cross-section of the passage; and
- (e) forcing a low volume of primary air through said one throttle orifice into the mixing chamber at high velocity downstream of the passage to create within the mixing chamber a low pressure zone into which is accelerated a high volume of secondary air entering the inlet from the shoe interior, said secondary air being forcefully drawn by, and mixed with, the primary air in the mixing chamber to form an air stream mixture that is forcefully conveyed away from the mixing chamber and expelled from the outlet, said high volume of secondary air being many times greater than said low volume of primary air due to the primary air imparting its high velocity energy to the secondary air which induces the secondary air to flow into the mixing chamber.
- 12. The method according to claim 11; and further comprising removably mounting the sole within the shoe.
- 13. The method according to claim 11, wherein the step of forming said at least one throttle orifice includes forming additional throttle orifices in the sole, and the step of successively arranging the orifices along the passage.
- 14. The method according to claim 11, wherein the step of forming said inlet is performed at a toe portion of the sole, and wherein the step of forming said outlet is performed at a heel portion of the sole.
Parent Case Info
This is a continuation of application Ser. No. 07/905,687, filed Jun. 6, 1992, now abandoned.
US Referenced Citations (14)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0911767 |
Nov 1962 |
GBX |
2189679 |
Nov 1987 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
905687 |
Jun 1992 |
|