US 3178836 A
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C- S. TURNER April 20, 1965 SAFETY SHOE HAVING AN INSTEP AND METATARSAL PROTECTOR 2 Sheets-Sheet 1 Filed May 20, 1963 1&4
ATTORNEY r m my mu S s U P U4 C (Q-g m 113M C. S. TURNER A ril 20, 1965 SAFETY SHOE HAVING AN INSTEP AND METATARSAL PROTECTOR 2 Sheets-Sheet 2 Filed May 20, 1963 l4- "';""I'II// lbl ill! n if INVENTOR.
Ca vus 5. Turner C Lgs/n a/ ATTORNEY United States Patent 3,178,836 I SAFETY SHQE HAVENG AN INSTEP AND METATARSAIL PRQDTECTUR Cyrus S. Turner, 134 E. Main St., Hopidnton, Mass. Filed May 2t), 1963, Ser. No. 281,555 3 Qlairns. (Cl. 36-72) This invention relates to a safety shoe, and more particularly to a shoe which has a built-in protection for the instep and toes against the blow of a heavy object dropped onto the foot.
In a standard work shoe, a steel box is incorporated in the toe, but that does not protect the foot against an object striking the metatarsal arch or the instep. A recent attempt at solving this problem has involved the application of a one or two piece rigid reinforcement applied on the outside portion of the shoe, but this reinforcement, being external and having an exposed front edge provides a serious disadvantage, in that a wire or a sharp edged object could be inserted or catch beneath the reinforcement I and perhaps cause an accident. Moreover, such a reinforcement is not flexible enough to permit a ready bending of the foot during the ordinary acts of walking, and the stiffness of the reinforcement may, in fact, cause injury to the foot.
It is a primary object of this invention to overcome such disadvantages and to provide a shoe construction which protects not only the toe but also the tarsal 0r instep and metatarsal parts of the foot, and which permits ready bending of the foot during the acts of walking or working in a stooped position.
Another object is to provide a reinforcing arch plate over the metatarsal portion of the foot as well as over the toe and to provide a separate protector over the instep or tarsus which can move relative to the reinforcing p.ate
to permit easy walking, but which is so secured in place in the shoe construction as to be held always in a correct position of protection. Further object will be apparent in the following disclosure.
in accordance with this invention, I build a strengthening upwardly convexed arch plate arranged to serve as .a protector over the metatarsal portion of the foot, which may be integral with or separate from a reinforcing toe box. This arch shaped plate is mounted on the shoe sole and provides a platform on top of which a strong and substantially inflexible instep or tarsus protector is mounted and arranged for a sliding movement relative to the arched plate to provide shoe flexibility. Both the metatarsal and tarsus protectors may be formed of steel or a suitable strong and rigid plastic which can resist the impact of a heavy object falling on the foot. The tarsus protector being arranged at a large angle to the horizontal, transfers a major portion of an impact blow to the arch plate. Each of these reinforcement members is covered over with the leather or other fabric used for the outer surface of the shoe, and the structrue is such that the shoe has a continuous and uninterrupted surface from the toe rearwardly toward the instep. To permit access to the shoe, the tarsus protector is secured to one side only of the shoe upper adjacent to the eyelets for the shoe lace, and both sides of the protector may have eyelet holes through with the lace may be threaded. The reinforcing arch plate may be lasted into the shoe construction and so arranged that a flanged edge is supported on the sole.
Referring to the drawings illustrating one embodiment of the invention:
FIG. 1 is a perspective view of a partly completed shoe;
FIG. 2 is a top plan view broken away of the front portion of the shoe before the addition of the fabric covering shown in FIG.
FIG. 3 is a sectional view of the metatarsus protector taken on the line 3--3 of FIG. 2;
FIG. 4 is a plan view of the front fabric covering before it is lasted with other portions into the shoe form;
FIG. 5 is a view similar to that of FIG. 4 but with under and over tongues attached thereto and which is to be lasted over the structure of FIG. 2;
FIG. 6 is a fragmentary exaggerated longitudinal section on the line 66 of FIG. 5 after superimposition of the structure of FIG. 5 on that of FIG. 2;
FIG. 7 is an exaggerated sectional view on line 7--7 of FIG. 2;
FIG. 8 is a plan View of the instep protector, having attached to one side a fabric member arranged to be stitched onto the underside of the upper;
FIG. 9 is a section on the line 9-9 of FIG. 8; and
FIG. 10 is a side view of the protector.
In accordance with this invention I have provided a workmans shoe with a toe box 10, ordinarily made of steel, and a rigid arched protector plate 12 over the metatarsal portion of the foot. Associated with the metatarsal arch plate 12 is a rigid tarsal or instep protector 14 connected laterally (FIG. 7) near one edge portion to one of the two portions 15 of the upper fabric which are to be laced together. The protector 14 is arranged to slide on the top bridgelike surface of the arch plate 12, as the wearer bends the shoe in the ordinary course of walking.
The front toe box 16 and the arch plate 12, which may be made integral as a single piece, are each preferably made of steel or a rigid and strong plastic capable of withstanding a severe blow caused by an object falling onto the wearers foot. The instep protector 14 is similarly made of steel or other rigid and strong plastic material and it is arranged for transferring a considerable portion of an impact blow to the top of the arch plate 12 and thereby protect the delicate bones of the wearers instep. The instep protector 14 may be made of suitable width and length as well as a shape which conforms to the wearers instep such as is shown in FIGS. 8, 9, and 10. It is also preferred that this protector 14 may be made of such shape and dimensions that it may fit under the two relatively movable and connectable edge portions of the upper 15 which have the eyelets 16 adapted to carry the shoe lace and thereby provide no obstruction under which the free end of a wire or other object might catch.
In the manufacture of a shoe, the fabric portion 18 (FIG. 5) which covers the shoe front is to be lasted into position over or around the steel box toe 10 and the arch plate 12 and it is suitably secured to the shoe sole as by means of a welt or other means (not shown) in accordance with standard practice. Both the toe box and the arch plate 12 have wide horizontal flanges 19 (FIG. 3) riding on the sole which transmit any blow to the latter. The front covering fabric 18 is preferably cut out, as shown in FIG. 4, to provide the opening 20 which is slightly wider in both dimensions than the width of the lower end portion of the protector 14. The edges of this cut out 2t) form sides of a slideway (FIG. 2) which aid in guiding the protector in its sliding motion. However, the fabric 18 may be left uncut except for a narrow slot through the fabric. Since there must be flexibility of movement of the protector 14, I preferably secure a strip of elastic webbing 22, as by means of stitching 23 at its two ends to fasten its ends only to the covering 18 (FIG. 5) on the opposite sides of the cutout 20. The cutout 2t) may be narrowed to a slot through the fabric 18, but as shown there is a slot 24 (FIG. 5) above the elastic 22 and through a medial extension 25 of the lining 18, through which the protector 14 may be inserted from above. That is, the protector 14 lies over the lining extension 25 and the latter aids in protecting the foot from abrasion or friction. An upper cover 26, slightly wider than the hole 26, is stitched to the fabric 18 around the hole sides and front by means of a stitching 27 (FIG. 5) so that this upper cover 26 not only covers the hole 29 but it conceals the protector 14, as shown in FIG. 6. The various fabrics are greatly exaggerated in thickness in FIG. 6, but they are so shaped as not to provide obstructing ledges which would catch onto wires or edged objects.
In order to hold the protector 14 in place, a strip of fabric 28 is secured as by a layer of cement 29, to the edge portion of the protector 14, as shown in FIG. 7. The protector 14 is provided with holes 30 adapted to be brought into alignment with the shoelace eyelets 16, and the parts are so arranged that the shoe lace may be inserted through the two sets of eyelets 16 and holes 30 and thus secure the protector to the eyelet edges of the upper port-ion 15.
As above stated the toe box and the arch plate 12 may be either integral or separate pieces as desired, and the arch plate 12 is preferably shaped to'p'rovide a rearwardly curved edge 32 (FIG. 1) which thus provides a greater length of contact between the arch plate and the shoe sole 33. The arch plate is sufficiently wide, lengthwise of the shoe, and the tarsus protector 14 is of such length that the protector may slide on the upper face of the convex support 12 for the instep protector 14 to the extent required for the normal bending of the shoe.
When the fabric of FIG. 5 has been assembled over the shoe parts of FIG. 2, the metatarsus protector 12 and the tarsus protector 14 are fully concealed, and the shoe has the normal appearance of a work shoe. It will be understood that in assembly, the protector 14 is inserted inwardly from above through the slot 24 to a position of riding directly on the arch plate 12. This leaves the upper cover 26 above the protector 14, while the under lining extension is located between the protector 14 and the wearers instep and thus relieves the latter its upper portion protectively mounted over the instep ofthe wearer. The tarsal or instep protector is mounted at a considerable angle to a horizontal plane, when in its normal position over the instep, so that the'impact energy derived from a body falling onto the instep is transmitted by the protector 14 to a large extent directly to the impact resisting arch plate over the metatarsal por-.
tion of the foot. In order to provide for ease in Walking, the instep protector is arranged to slide longitudinally of the top surface of the convex metatarsus protector plate 12. That protector 14 is preferably movably secured in position by the provision of two sets of holes adapted to be brought into alignment with the eyelets through which the shoe lace is threaded. One edge portion of the protector 14 may be secured permanently to one side of the upper, and it is sufficiently movable so that the foot of the wearer may be readily inserted into the shoe. In order to provide a substantially smooth outer surface for the front portion of the shoe and prevent wire or sharp edged objects from catching under the protector 14, cover 26 is secured to the shoe in position An elastic fabric sewed to the two side portions of the upper which are to be laced together aids in holding the protector in position and thereby provides flexibility of the parts for shoe movement. As will be appreciated, the tongues and other parts of the shoe may be made of any suitable fabric, such as leather or cloth or a plastic of an appropriate composition. It will also be appreciated that the tarsus protector is made concave in a longitudinal dimension as indicated in FIG. 10, so that it will conform substantially to the shape of the average wearers foot. The term rigid used herein to apply to the protectors 12 and 14 is a relative term, since the various parts may be slightly yielding provided they are able to resist impact and meet the various requirements of a safety shoe. By this construction, the metatarsal and the tarsal portions of the foot are protected against the impact of a falling body and the blow is transmitted primarily to the rigid arch plate 12 and not through the bone structure of the wearersfoot. Hence, the arch plate is of primary importance in its ability to resist such impact, and the tarsus protector is so shaped and arranged that it will shunt the blow striking the instep of the foot primarily onto the impact resisting arch plate.
It will now be appreciated that various modifications may be made in this structure to satisfy the above objects of the invention. Hence, the above disclosure is to be interpreted as defining the principles of the invention and a preferred embodiment thereof and not as imposing limitations on the appended claims. The terms arch, arched and arch plate as applied to the convex protector plate 12 are usedwith architectural significance, and the terms metatarsus and metatarsal arch are used anatomically to refer to that portion of the human foot which is located between the toes and the tarsus or instep.
What is claimed as novel and useful is:
1. A safety shoe comprising a sole and an upper secured together, an impact resisting upwardly arched plate of rigid material which has depending sides supported rigidly on the sole and a top portion shaped and adapted for extending over and protecting the metatarsal portion of the wearers foot, said upper having two opposed relatively movable and conncctable front edge portions which are adapted for securing the shoe on the wearers foot, a rigid elongated instep protector plate located beneath said edge portions which is shaped and adapted to fit over and protect the tarsal portion of the wearers foot, said protector plate having its lower end freely mounted on said arched plate for a longitudinal sliding movement thereon, and means for preventing a material lateral movement of the protector plate as it slides longitudinally during a normal flexing of the shoe.
2. A safety shoe according to claim 1 comprising a lining located beneath the protector plate and a tongue shaped cover means connected to the upper in position where it lies over and conceals the protector plate and prevents a direct contact of the latter with external ob jects.
3. A shoe according to claim 2 in which a part of the upper lining which lies beneath the protector plate has a slot through which the protector projects into contact with said arched plate protector, the sides of the slot serving to guide the protector in its sliding movement.
References Cited by the Examiner UNITED STATES PATENTS 2,842,872 7/58 Shultz 36-72 2,988,829 6/61. Johnson -1 36-72 3,082,553 3/63 Wilmanns 36-72 3,101,559 8/63 Smith 3672 3,102,347 9/63 Griswold et al. 3672 3,108,386 10/63 MacQuaid 3672 JORDAN FRANKLIN, Primary Examiner.
FRANK I. COHEN, Examiner.