US 3795994 A
This sock is of the type described in the head patent i.e. arranged to constitute air cushions interposed between the wearer's foot and the boot.
Description (OCR text may contain errors)
[ AIR-CUSHION SOCKS Y van Dall Ava, 54 C ite Belle Ma sl B2 119. B 99.
 Filed: May 4, 1971 [2l] Appl. No.: 140,132
[ Mar. 12, 1974 Primary Examiner -Patrick D. Lawson Attorney, Age'n't, 0r FirmEdward F. Levy I ABSTRACT This sock is of the type described in the head patent i.e. arranged to constitute air cushions interposed bemanufactured  Foreign Application Priority Data tween the wearers foot and the boot.
May 5, 1970 France 70.16269 It consists of a thin, flexible and air-impervious Apr.26, 1971 France .Q 71.14749 envelope divided longitudinally into a number, for example five, of internal, air-tight compartments of  US. Cl. 36/29 relatively great dimensions, each of them forming an [51 Int. Cl A43b 13/20 air cushion, since air is contained in each of them, this Field Of Search 3, 3 R, 3 3 B air being adapted to flow from one compartment to another through throttling passages.  References Cited These socks can easy by the UNITED STATES PATENTS commercially scale, in a trouble-free manner, and are 2,007,803 7/1935 Kelly 36/29 adapted to prove entirely satisfactory to the wearer. 1,304,915 5/1919 Spinney 36/29 2,080,469 5 1937 Gilbert 36/29 1 Claim, 12 Drawlng Flgul'es '1 7 1 1 (i 10 5 4 9 .5 -L fi ti *1 1L L i i PATENTEDMAR 1 2 mm 3.795994 SHEET 2 [IF 2 AIR-CUSHION SOCKS SUMMARY OF THE INVENTION The present invention relates in general to socks, that is, complementary inner soles utilized sometimes in boots, shoes and other footwears for modifying or rendering more comfortable these boots or the like, and more particularly to an improved sock of this type, characterized in that it consists of a relatively thin envelope of flexible, air impervious material, divided in the longitudinal direction into a plurality of air-tight compartments, for example five in number of relatively large dimensions and forming each an air cushion, since each compartment is filled with air adapted, if desired, to flow from one compartment to another through a relatively narrow or throttled passage adapted to retard this flow.
According to a preferred form of embodiment of this invention the air-cushion sock constituting the subjectmatter thereof comprises two relatively thin superposed sheets of p.v.c. or other suitable heat-weldable resin materials, these sheets being die-cut to the desired shape and welded along their edges to form the afore said separate compartments each containing a sufficient quantity of air.
These two thin superposed sheets of resin material may be obtained from two separate webs or from a single but tubular piece of extruded material; in the last case the transverse weld seams assembling the two sheets may be formed directly during the extrusion process.
Flat sheets may be used as such; in certain cases, one or both of a pair of thin, air-impervious sheets may be heat-shaped in such a manner that each compartment may have the same thickness along its edge and in it central portion.
If desired, means may be implemented for causing the air pressure to differ from one compartment to another, so that each compartment be inflated at the pressure best suited to the weight to be supported during the actual use of the sock. This result may be obtained directly from the welding operation by simply causing these two sheets to adhere, for example by suction, to patterns or forms having the desired contour, except ofcourse along the weld seams; thus by properly selecting the curvature of these patterns or forms, it is possible to, adjust with a high degree of precision the pressure values obtained in the various compartments.
BRIEF DESCRIPTION OF THE DRAWING The attached drawing illustrates diagrammatically by way of example several forms or embodiment of the present invention. In the drawing:
FIG. 1 is a perspective view of a sock;
FIG-S. 2, 3 and 4 are longitudinal sections showing FIG. 9 is a plane view showing a modified form of embodiment of one of the sheets constituting a sock according to this invention;
FIGS. 10 and I] are sections taken along the lines X-X and XXl of FIG. 9, respectively, and
FIG. 12 is a fragmentary perspective view showing on a larger scale the sock illustrated in the preceding FIGS. 9 and 10.
DESCRIPTION OF THE PREFERRED EMBODIMENT The sock shown in the various figures of the drawing comprises essentially two relatively thin sheets 1, 2 of a flexible, air-impervious material, such as p.v.c., these sheets being welded along their peripheral edge 3 and also along transverse lines 4, 5, 6 and 7 to form air-tight compartments 8, 9, 10, 11 and 12 filled with air so as to have a certain thickness.
As shown in FIG. 3, the quantity of air contained in each compartment may differ, according to the weight to be supported thereby and also to the particular contour of the wearers foot.
This result may be obtained very easily by welding the two sheets 1, 2 along their edges 3 and along transverse lines 4 to 7 while these sheets are caused to adhere by suction, except of course along the weld seams or lines, against registering surfaces of a pair of forms or patterns leaving therebetween a more or less considerable free space for the air.
Instead of being formed from two separate sheets 1 and 2 as described hereinabove, the flexible and airimpervious envelope constituting the sock according to this invention may be obtained from a tubular blank or web 13 in which the compartments are formed either by means of the transverse weld seams or lines 4 to 7, as in the preceding case, or by means of integral joints 14, 15, 16 and 17 formed directly during the extrusion process.
In certain cases these sheets 1 and 2 of flexible, airimpervious material may be lined with a relatively thin sheet of foam l8, 19 in which air is retained (closedcell foam structure), as shown in FIG. 5.
As in the preceding case and as illustrated in FIG. 6, these two sheets are welded together along their edges and also along transverse lines 20, unless these transverse lines are obtained directly by extrusion in the form of a small partition 21 interconnecting the sheets.
In certain casesthe sock may be reinforced by providing a stiff edge 22 along the more strained side, that is, as a rule, the outer side.
According to a modified form of embodiment illustrated in FIGS. 9 to 12 the sheets of thin flexible, airimpervious material may be heat-shaped to comprises a number of separate longitudinal compartments 24 between which a double partition 25, 26 is formed to an inverted U configuration, as shown, in the case of the lower sheet, and comprises a marginal flange 27 coplamar with the top or upper face 28 of these double partitions 25, 26; small passages 29 may be provided in the partitions to permit the flow of air from one compartment to another with a sufficient throttling effect.
A longitudinal partition may also be provided, if desired, this longitudinal partion consisting similarly of two sheets 30 and 31, with a top face 32 level with the other top faces 28 of the aforesaid transverse partitions and also with the flange 27 of the sock; this longitudinal partition may also comprise small throttling passages 33 interconnecting a pair of transversely aligned compartments.
The assembly is closed and sealed by simply superposting thereto a thin sheet 34 of flexible and air-tight material welded along the flanges 27 of the sock and also to the top faces 28 and 32 of the transverse partitions and possibly of the longitudinal partition.
Of course, the specific forms of embodiment of the invention illustrated in the drawing and described in detail hereinabove should not be construed as limiting the scope of the invention since various modifications may be brought thereto without departing from the basic principles thereof as set forth in the appended claims.
Thus, notably, it may be advantageous to use a sock of the type set forth by completing same with another inner sole adapted on the one hand to isolate the wearers foot from the flexible and air-tight material constituting said sock, an on the other hand to'ensure a better distribution of the foot pressure over the entire surface of the sock; thus, an inner sole of the type described and illustrated in the French Pat. No. 1.426.837 of its Certificate of Addition No. 91.180 may advantageously be used, this second sole being cemented to, or simply laid on the first one.
What is claimed is:
1. A sock comprising a thin envelope of flexible, airimpervious material, divided longitudinally into a plurality of internal fluid-tight compartments of relatively large dimensions, each compartment containing air and forming an air cushion, said envelope being sized to extend beneath the full length of a foot with each compartment producing an individual damping action when aload is applied thereto, a different air pressure being obtained in each one of said compartments in order better to adapt each of them to the load to be applied thereto.