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Publication numberUS2590648 A
Publication typeGrant
Publication dateMar 25, 1952
Filing dateJan 12, 1949
Priority dateJan 12, 1949
Publication numberUS 2590648 A, US 2590648A, US-A-2590648, US2590648 A, US2590648A
InventorsPitz Carl A
Original AssigneeA L Langenfeld Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Slotted sole sandal
US 2590648 A
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Description  (OCR text may contain errors)

March 25, 1952 c PlTZ 2,590,648

SLOTTED SOLE SANDAL- Filed Jan. 12, 1949 2 SHEETS-SHEET l A NVENTOR 32 CARL A. Prrz 17 12150 5 BYQ 5 WW ATTORNEY March 25, 1952 Filed Jan. 12, 1949 C. A. PITZ SLOTTED SOLE SANDAL 2 SHEETSSHEET 2 INVENTOR ATTORNEY Patented Mar. 25, 1952 SLOTTED SOLE SANDAL Carl A. Pitz, New Holstein, Wis., assignor, by mesne assignments, to A. L. Langenfeld, Inc., New Holstein, Wis., a corporation of Wisconsin Application January 12, 1949, Serial No. 70,441

2 Claims. (Cl. 36-11'.5)

This invention relates to sandals and particularly slotted sole sandals having a hinged sole retained on the foot by means of straps.

' An object of this invention is' to provide a sandal having a hinged sole adapted to flex with the foot and which is comfortable and durable.

Another object is to provide a sandal having a hinged sole which may be manufactured at low cost.

' Another object is to provide a sandal having a sole hinged to pivot freely without pinching or irritating the foot.

A further object is to provide a sandal having straps which comfortably retain the sandal on the foot.

Still a further object is to utilize straps for retaining a sandal on the foot without cuttin the foot with the strap edge.

Other objects and advantages will be pointed out in, or be apparent from, the specification and claims, as will obvious modifications of the single embodiment shown in the drawings, in which:

Fig. 1 is a top view of a sandal for the right foot;

Fig. 2 is a side elevation of the sandal as worn on the foot shown in dotted lines;

Fig. 3 is a top view of the sandal with the straps removed; "Y'Fig. 4 is a side elevation of the sandal wit the straps removed;

,' Fig. 5 is a bottom view of the sandal; and

' I 'Fig. 6 is a vertical section through the hinge on line 6-B in Fig. 4.

Referring to the drawings in detail, Fig. 1

shows the top of a completed sandal with the strains in the position they occupy when the sandal is worn on the foot as shown in dotted lines in Fig. 2. The sole ll) of the sandal is preferably constructed of wood having its grain running alongits'longitudinal axis (toe to heel) for reasons which will appear hereinafter. The sole con sists of three pieces hinged together to flex with the foot. The most forward portion l2 underlies the toes with the ball of the foot resting on the center section l4 and the remainder of the foot on the heel portion l6. As the length of the sole is varied for different foot sizes, the proportions of the sections must be maintained in order to avoid irritation by the hinges and to insure comfort.

The hinge construction between the three sole pieces is best shown in Figs. 3 through 6. The center section 14 is provided with vertical transverse walls l8, 20 from which a plurality of spaced hinge lugs 22, 24, respectively, project. Lugs 22 interfit with spaced lugs 26 formed in the heel portion I6. It will be noted that the hinge lugs have curved faces to permit free movement of the parts with respect to each other as they rotate about hinge pin 28 which passes through the interfitting lugs and terminates in the heavier or wider lugs 26 adjacent the inner and outer edges of the shank. The hinge lugs 26 on the heel portion I6 are undercut at 36 for reasons which will appear hereinafter.

Hinge lugs 24 on the forward wall of center section [4 similarly interfit with spaced hinge lugs 32, undercut at 38, on the toe portion l2. These interfitting lugs are adapted to pivot on hinge pin 34 which terminates in the wide lugs 35 on the toe section adjacent the inner and outer edges of the shank. Further reference to Fig. 6 will also show that pin 34 may be retained in position in the interfitting lugs by plug 36 to obtain a matching finish on the exterior of the sandal while utilizing a metal pin.

As the sole of the sandal flexes there is complete freedom of movement of the component parts to insure the utmost in comfort. The undercutting of the hinge lugs 26,- 32 on the heel and toe portions l6, l2 at 36 and 3B prevents the lugs from contacting the surface under the sandal. Thus there is no frictional resistance to flexing the sandal as a result of the hinge lugs rubbing over the surface under foot. While the hinge lugs on the center section l4 are shown as being slightly undercut, this is merely a manufacturing expedient. These lugs cannot scrape the undersurface since flexure of the sandal raises the center section from the surface as or before the center section flexes with respect to the toe portion.

While frictional resistance due to the hinge lugs scraping on the undersurface has thus been avoided, it would appear at first blush that the relatively movable parts of the sole would tend to pinch the foot. It has been found, however, that positioning the hinge pin above the medial plane of the sole minimizes such pinching by reducing relative movement of the upper sole surfaces for a given degree of rotation of the parts. This is shown in Fig. 6 where the distance a from the bottom of the sole to the centerline of the pin is greater than the distance 1) from the centerline to the top of the sole.

Another feature resulting in complete foot comfort is the manner in which the forward hinge lugs 24 on the center section l4 are offset toward the inner edge of the sole with respect to the lugs 22 on the rear face of the center section. Moving the interfitting lugs 24 toward the inner edge of the sole in this manner reduces ir- 3 ritation of the muscle running from the big toe to the ball of the foot and additionally serves to conform the shape of the hinge portion of the sole between the toe section l2 and the center section 14 to the shape of the sole.

Care must be taken to leave ample material on the toe and heel portions adjacent the inner and outer edges of the sole to receive the ends of the corresponding hinge pin. As pointed out above, the grain of the Wood runs generally from heel to toe, and if the ends of the hinge pin were not anchored in the heavy material adjacent the inner and outer edges of the heel and toe portions, the pin would tear through the hinge lugs. Running the grain crosswise would not eliminate this trouble since the hinge lugs would then snap 01f at th roots. The center section l4, however, need not be provided with such Wide lugs. since the stress acts at a slight angle to the grain and the pin neither tears out nor shears the lugs. Thus this structure completely eliminates any tendency'for'the hinge pins to tear out of or to shear the hinge lugs. The resultant straight vertical transverse walls on the center section permit simplified manufactureof the center section and material cost reductions.

The sandal is retained on the foot by means of two straps, one fitting'over the heel and'angle and the other fitting over the-forward portion of the. foot. as shown in Figs. 1 and 2. The heel portion l6 is'provided-with a rearwardly inclined transverse. slot 40-through which strap 42 passes. One end of the strap passes through a pair of slots 44, 46 on the strap to frictional'ly'retain a loop in the lower part of the strap. This permits the strap to be adjusted" to the particular heel so that the cross-over point generally denoted. 48 lies over the. heelxas' shown. The endsof the" strap are then brought around the angle and buckled to firmly hold the heel'to-the sole. Thus strap 42 generally assumes afigure 8' shape with the lower loopv passing through slot 40. and fitting over theheel and the upper 100p encircling, the ankle. The. rearwardly inclined slot 40' causes the lower loop of" strap 42 to form a pocket receiving and lying flat against the. heel, thus avoiding'any cutting of the heel.

Theforward part of the foot is retained'on' the sandal by means of strap 50; This strap passes through forwardly inclined transverse slots' 52;

54,56 in the heel, center, and't'oe portions of the sole., The forward, inclination of the slots is particularly advantageous in the case of'slot's 54;v 56 in the center and toe portionswhere they slightly twist the strap so that the strap portions adjacent the sole will be substantially parallel to the edge of the. sole andjcont'act' with the foot over thefull strap width. If these slots were horizontal, the rear edge of the strap would liecloser to the sole of the foot than would theforward edge, resulting incontact with the foot localized at the said edge of the'strap. Thusthe provision of forwardly inclined slots generally shapes apocket com- 4 fortably receiving the foot and conforming to the foot. It will be noted that the buckle on strap permits adjustment of the total length of the strap. This results in the strap adjusting itself to the individual foot since the strap is free to slide in the slots 52, 46.

Although but one embodiment of the present invention has been illustrated and described, it will be apparent to those skiled in the art that various changes and modifications may be made therein without departing from the spirit of the invention or from the scope of the appended claims.

I claim:

1. Asandal having a sole having toe and ball portions the upper and lower faces of which are generally: parallel, a plurality of transverse forwardly and downwardly inclined slots through said sole in the toe and. ball portions thereof, and a strap passin through said slots and diagonally' over the'foot, theinclination of'said' slots serving to twist the strap to-lie flat against the foot.

2. A sandal having a sole including; toe; ball, shank and heel portionsysaid heel portion being thicker than the toe and ball portions, and the upperand lower'faces ofthe toe, and ball portions being generally parallel, the upper face of the shank portion sloping upwardly and rearwardly, a plurality of transverse slots in said toe and ball portions inclined downwardly. and forwardly; a transverse slot in said shank portion inclined forwardly and downwardly, and a strap; passing through said slots and diagonally over the foot, the ends of the strap" being adjustably'interconnected to form a pocket receiving the toe, balliand instep portion. of the foot: and the inclinationof said slots serving to twist the strap tolie fiat against said portionsof'thefoot.

CARL A. PITZ.

REFERENCES CITED The following references are of record in-v the file of this patent:

UNITED STATES PATENTS Number Name Date 1,341,498 Demarmels May 25;.1920 2,126,077 Youngberg 'Aug. 9; 1938 2,126,094 Daniels Augz-9; 1938 2,343,701 Pickens ar. 7,. 1944 2,466,580 Dalbey -fApr. 5;. 1949 FOREIGN I PATENTS Number Country: Date- 6,757 Great Britain May 20, 1886' 686,325 France Apr;v 8, 1930 745,045 France Feb: 7, 1933 874,012 France" Apr. 13,1942 876,666 France Aug. 10, 1942 879,963 Austria Feb..10', 1920 880,213" France Dec: 18; 1942

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1341498 *Apr 8, 1919May 25, 1920Albert WinklerWooden shoe or sandal
US2126077 *Jul 11, 1934Aug 9, 1938Walter K YoungbergShoe sole
US2126094 *May 23, 1936Aug 9, 1938Daniels Claude HShoe
US2343701 *May 19, 1943Mar 7, 1944Mach & Tool Designing Co IncFootwear
US2466580 *Jul 19, 1945Apr 5, 1949Glen N LollisSandal with flexible wooden sole
AT879963B * Title not available
FR686325A * Title not available
FR745045A * Title not available
FR874012A * Title not available
FR876666A * Title not available
FR880213A * Title not available
GB188606757A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2963799 *Sep 24, 1959Dec 13, 1960Savin CorneliusArch massaging shoe
US3082548 *Jan 29, 1962Mar 26, 1963Hartman Edward DSand shoe
US3455037 *Oct 27, 1967Jul 15, 1969Vlas Peggy JoyceMini sandal
US3742625 *Jul 3, 1972Jul 3, 1973Famolare IncArticulated clog
US3748757 *Jun 1, 1972Jul 31, 1973Silver SSandal
US3800444 *Dec 5, 1972Apr 2, 1974Young CSandal construction
US4944099 *Aug 30, 1988Jul 31, 1990Slingshot CorporationExpandable outsole
US5410820 *Mar 11, 1994May 2, 1995Goodman; Michael C.Hinged shoe sole assembly for fixed and variable heel height shoes
US5926975 *Feb 3, 1998Jul 27, 1999Goodman; Michael C.Hinged shoe sole assembly for working boots
US6021585 *Dec 21, 1998Feb 8, 2000If360, LlcFootwear
US6286233Apr 8, 1999Sep 11, 2001David E GaitherInternally laced shoe
US6499234 *Jan 26, 2001Dec 31, 2002Heather R. ManziShoe system
US6581255May 4, 2001Jun 24, 2003Gail A. KayLocking mechanism for convertible shoe system
US6606803 *Sep 3, 1999Aug 19, 2003Deckers Outdoor CorporationFootwear sole and arch strapping system
US6792696 *Nov 13, 2001Sep 21, 2004Bergann LlcShoe with interchangeable strap system
US7051458May 28, 2004May 30, 2006Laduca Phillip FHigh-heeled jazz dancing and character dancing shoe
US7162814Aug 4, 2004Jan 16, 2007David BergShoe with interchangeable strap system
US7174657Sep 21, 2005Feb 13, 2007David BergShoe with interchangeable strap system
US7284341Oct 27, 2005Oct 23, 2007Moseley Marshall GSand walking sandal
US7287342Jul 15, 2005Oct 30, 2007The Timberland CompanyShoe with lacing
US7290356Jun 8, 2005Nov 6, 2007Keen, Inc.Footwear with multi-piece midsole
US7320189Aug 2, 2005Jan 22, 2008The Timberland CompanyShoe with lacing
US7331122 *Jun 9, 2005Feb 19, 2008Reebok International Ltd.Convertible sandal
US7347012Jan 10, 2006Mar 25, 2008The Timberland CompanyShoe with lacing
US7448148 *Oct 3, 2005Nov 11, 2008Viamerica Enterprises LlcArticulated foldable sandals
US7513064Jul 22, 2004Apr 7, 2009Keen, Inc.Footwear having an enclosed and articulated toe
US7562470Sep 14, 2007Jul 21, 2009The Timberland CompanyShoe with wraparound lacing
US7631440Jun 7, 2006Dec 15, 2009The Timberland CompanyShoe with anatomical protection
US7730634Mar 15, 2006Jun 8, 2010Laduca Phillip FHigh-heeled jazz dancing and character dancing shoe
US7762011Jan 29, 2007Jul 27, 2010Keen, Inc.Toe protection sandal
US7762012Sep 27, 2007Jul 27, 2010Keen, Inc.Footwear with multi-piece midsole
US7997009Apr 1, 2009Aug 16, 2011Keen, Inc.Footwear having an enclosed and articulated toe
US8117769 *Sep 25, 2008Feb 21, 2012Munro & Company, Inc.Cushioned shoe construction including toe and heel plates
US8245420 *Jan 31, 2008Aug 21, 2012Patient Pedro LlcFlexible footwear
US8302329Nov 18, 2009Nov 6, 2012Nike, Inc.Footwear with counter-supplementing strap
US8322054Jul 7, 2009Dec 4, 2012Craig FellerShoe with interchangeable strap system
US8533976Aug 15, 2011Sep 17, 2013Keen, Inc.Footwear having an enclosed toe
US8646191 *Aug 13, 2010Feb 11, 2014Nike, Inc.Sole assembly for article of footwear exhibiting posture-dependent characteristics
US8656612Sep 13, 2012Feb 25, 2014Nike, Inc.Footwear with counter-supplementing strap
US8763275 *May 2, 2011Jul 1, 2014Mor Talia ShalomFoldable footwear
US20110016748 *Jun 18, 2010Jan 27, 2011Ilianna SolerFoldable flip-flop
US20110094125 *Dec 5, 2008Apr 28, 2011Christopher WeightmanFoldable footwear and soles for foldable footwear
US20120036739 *Aug 13, 2010Feb 16, 2012Nike, Inc.Sole assembly for article of footwear exhibiting posture-dependent characteristics
US20120079745 *May 2, 2011Apr 5, 2012Stand Alone LtdFoldable Footwear
WO1992020248A1 *May 15, 1992Nov 26, 1992Jo Anne Of California IncShoe with two-piece hinged sole and detachable heel
WO2000059324A1 *Apr 7, 2000Oct 12, 2000David E GaitherInternally laced shoe
WO2005053450A2 *Nov 12, 2004Jun 16, 2005Lexz9 IncShoe or sandal having rotatable and reversible vamp, or loop strap
WO2006086016A2 *Oct 4, 2005Aug 17, 2006Benjamin MartinezArticulated foldable sandals
WO2006098811A2 *Jan 27, 2006Sep 21, 2006Marshall G MoseleySand walking sandal
Classifications
U.S. Classification36/11.5, D02/916, 36/58.5, 36/31, 36/33
International ClassificationA43B3/12
Cooperative ClassificationA43B3/128
European ClassificationA43B3/12S