Abstract:
A glove for preventing carpal tunnel syndrome has palm-covering padding which protects the wearer&#39;s hand. The padding is made of a resilient flexible material such as foam rubber which is effective to provide protection from vibrations and shocks, and has a fold line extending diagonally across the palm to facilitate gripping the handle of an implement. This light-weight glove allows freedom for the fingers, wrist, and central folding of the hand, yet protects the palm of the hand from shocks which can cause carpal tunnel syndrome.

Description:
TECHNICAL FIELD 
     This invention relates to a padded, protective glove, particularly a glove for prevention of carpal tunnel syndrome in persons whose occupation requires extended use of a manual implement. 
     BACKGROUND OF THE INVENTION 
     Carpal tunnel syndrome is a well known, commonly occurring hand condition, sometimes referred to as median compression neuropathy within the carpal canal. The most common symptoms of this condition include intermittent pain and numbness of the hand. Such pain or numbness results from compression of the median nerve which extends from the wrist centrally into the palm of the hand between the palm heel and the ball of the thumb. In carpal tunnel syndrome, a dense fibrous tissue called the transverse carpal ligament forms over the median nerve and compresses it, producing the symptoms of pain and numbness. 
     Treatment of carpal tunnel syndrome varies according to the severity of the condition. Severe conditions usually require hand surgery to sever the transverse carpal ligament. For less severe cases, the use of a splint which immobilizes the wrist is sometimes effective, often in combination with an anti-inflammatory medication. Such treatments are generally expensive, painful, and may reduce the patient&#39;s ability to use the affected hand. 
     Carpal tunnel syndrome is a particular problem for workers in industries which require repeated manual operations with a held implement or tool. Carpal tunnel syndrome is a leading cause of workmen&#39;s compensation claims in many such industries. 
     Protective gloves have been proposed as one means of preventing carpal tunnel syndrome due to wrist flexing in Occupational health and Safety, September, 1986, pages 18, 20. A glove proposed for this purpose in the foregoing publication includes a tough pigskin shell wrapped around the wearer&#39;s wrist. This glove is heavy, cumbersome, and restricts free action of the wrist. Berger U.S. Pat. No. 4,531,241 issued Jul. 30, 1985 describes a glove having a pad which covers the palm, wrist and a portion of the forearm. This glove also restricts free action of the wrist. 
     Fabry et al., U.S. Pat. No. 4,850,341 issued Jul. 25, 1989, describes a glove with a tapered pad designed for use by meat cutters or others using an implement with an action similar to using a knife. While this glove is useful for some applications, its pad configuration is not convenient for other types of actions in which the palm bends, particularly across the central fold of the hand. A solid palm pad inhibits this action. The present invention addresses this problem by providing a protective glove which facilitates gripping and allows greater flexibility across the central fold of the palm. 
     SUMMARY OF THE INVENTION 
     A protective glove according to the invention includes a glove body having a front and back which define a rear wrist opening, finger openings and a thumb opening. A generally resilient, flexible padding is disposed on the glove front and substantially overlies the palm covering portion of the glove front. The padding has a fold line extending diagonally across the palm covering portion in the widthwise and rearward directions of the glove from a location between the thumb and forefinger to a location on the palm heel. The fold line preferably comprises a split in the padding which divides it into a pair of adjacent front and back pads. The padding material has a size and resilience suitable for protecting the hand from shocks which can result in carpal tunnel syndrome while allowing freedom of action. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention will be described with reference to the appended drawing, wherein like numerals denote like elements, and; 
     FIG. 1 is a rear plan view of a glove according to the invention; 
     FIG. 2 is a front plan view of the glove shown in FIG. 1; 
     FIG. 3 is a sectional view of the glove of FIG. 2 taken along line 3--3 in FIG. 2. 
    
    
     DETAILED DESCRIPTION 
     FIGS. 1 through 3 illustrate an exemplary glove 10 according to the invention for preventing or inhibiting carpal tunnel syndrome. Glove 10 generally comprises a glove front 11 and glove back 12 sewn together in a face-to-face relationship to define a glove body. Glove front 11 and back 12 are configured and sewn together so as to define a rearwardly opening wrist opening 14, a plurality of forwardly opening half-fingers 20 terminating in finger openings 19A, 19B, 19C, 19D for the forefinger, middle finger, ring finger and pinkie, respectively, and a side thumb opening 18. Front 11 includes a palm heel portion 11A, a half-thumb 11B, a palm covering portion 11C which overlies most or all of the wearer&#39;s palm, and a wrist cuff 15 which adjoins wearer&#39;s wrist. Glove front 11 is preferably made of a pliable, sturdy material such as leather. Glove back 12 is preferably made of elastic to provide improved fit. 
     Wrist opening 14 has a U-shaped, lengthwise vent 17 in the center of glove back 12. A releasable contact fastener 27 located on back 12 near cuff 15 acts as a means for selectively releasably securing glove 10 to the wearer&#39;s hand. Fastener 27 includes a tab 28 and a base element 29 secured to glove back 12 on either side of back vent 17. Base element 29 comprises a piece of hook tape sewn to back 12, and the undersurface of tab 28 is made of fibrous pile material so that releasable fastener 27 comprises a typical hook and loop closure. Releasable fastener 27 could also be a snap, button, or similar fastener conventionally used on gloves. 
     A generally rectangular protective padding 21 is sewn to the inside of front 11 of glove 10 substantially overlying palm covering portion 11C, including most of palm heel portion 11A and part of the front of thumb portion 11B. The center of padding 21 corresponds to the portion of front 11 which overlies the middle of the wearer&#39;s palm. In the illustrated embodiment, padding 21 has a fold line 22 therein which extends diagonally across palm covering portion 11C in the widthwise and rearward directions of front 11 from a first location 23 between thumb opening 18 and forefinger opening 19A to a second location 24 on palm heel portion 11A. 
     Fold line 22 preferably comprises a split in padding 21 which divides the padding into a pair of adjacent pad sections, i.e., a front pad 25 and back pad 26. Pad 25 has a rounded, generally rectangular shape. Pad 26 complements the shape of pad 25 along split 22, and has a rounded thumb pad portion 26A which extends at least half the length of thumb portion 11B and tapers towards thumb opening 18. Fold line 22 prevents the padding from bunching up when the wearer is gripping or holding an object. 
     As illustrated in FIG. 3, pads 25, 26 are sewn to glove front 11 along a seam 42 disposed around the outer periphery of padding 21 between front 11 and an elastic fabric lining 43. Lining 43 holds padding 21 in place and provides a good feel to the inside of glove 10. 
     Padding 21 must have sufficient firmness to protect the palm of the hand from shocks or vibrations, but should have sufficient flexibility to permit the wearer to effectively grasp and hold an object while wearing the glove. Padding 21 is thus preferably made of an elastomeric material, such as foam rubber, particularly materials such as closed-cell neoprene, ethylene propylene terpolymer (EPT), styrene butadiene (STB), and similar elastomers. The following table sets forth the preferred properties of materials for use as padding 21: 
     
         ______________________________________Property      Preferred Minimum                       Preferred Range______________________________________Compression Deflection          2            5-9in p.s.i.Durometer (Shore 00)         25            40-60Density in p.c.f.          5            12-20Resilience*   25            30-35______________________________________ * Bashore % rebound average, 0.5 inch thickness at 72° F. 
    
     Preferred pad materials include Rubatex (trademark of Rubatex Corp., Bedford, Va.) R-421-N, R-422-N, R-425-N and Sorbothane (trademark of Sorbothane, Inc., Kent, Ohio). 
     Ordinary foam materials used as pads in conventional sporting gloves are generally too soft for use as padding 21. Thus, gloves for sports such as handball, wherein the palm is protected, are distinctly different from the glove 10 according to the present invention in both the size and shape of the protective pad and the characteristics of the pad. Padding 21 is most preferably made of a material having significant shock absorbing characteristics, so that shocks transmitted to the wrist by vibration or violent movements of the hand are dampened. The foregoing elastomeric materials are effective for this purpose. 
     Padding 21 has a preferred average width of at least about 7 cm, measured widthwise at its narrowest point (at thumb crease 44), typically in the range from about 7-12 cm, depending upon the size of the wearer&#39;s hand. Generally, the average width of padding 21 is at least as wide as wrist opening 14 when glove 10 is laid flat as illustrated in FIG. 2. The length of padding 21 from its rearwardmost edge to its forwardmost edge can vary considerably depending on both the size of the wearer&#39;s hand and the extent to which padding 21 overlies the wearer&#39;s palm. In general, the minimum or average length L of padding 21 should be at least about 6 cm, preferably about 6-10 cm. Overall, the minimum length and width of padding 21 are preferably about equal. Relative to the overall length of glove 10 from wrist cuff 15 to finger opening 19B, the length of padding 21 is typically from about 50-90% of the overall length of glove front 11, preferably 50-80% thereof. 
     The thickness of padding 21 is also important to providing sufficient protection for the hand. Thicknesses in the range of about 0.1 to 2 cm, particularly 0.5 to 1 cm, have been found advantageous because hand protection is provided without rendering the glove excessively bulky or inflexible. 
     Unlike the pad proposed in Fabry et al., U.S. Pat. No. 4,850,341, padding 21 need not adjoin wrist cuff 15. The curved bottom edge 31 of padding 21 (rear pad 26) is approximately aligned with thumb portion 11B, leaving a rear wrist portion 32 of front 11 free of padding to provide additional flexibility. In preferred embodiments, wrist portion 32 may have a minimum width as great as about 2 to 3 cm or more. 
     A glove 10 according to the foregoing embodiment of the invention is effective for protecting the wearer from repeated shocks and vibrations which may cause carpal tunnel syndrome. It is also light-weight, permits the wearer&#39;s wrist and fingers to move freely, and permits the palm to fold easily in a gripping action. 
     It will be understood that the foregoing description is of a preferred exemplary embodiment of the invention, and that the invention is not limited to the specific form shown. Modifications may be made in the design and arrangement of the elements without departing from the scope of the invention as expressed in the appended claims.