Patent Application
20170231375
1. Field of the Invention
The present invention relates generally to tool accessories and more particularly to a cover for retractors.
2. Description of the Prior Art
Carpenters, designers, facilities maintenance personnel, and other workers regularly use hand tools on a job site. Job site safety rules often require workers to tether a hand tool to the worker or structure to prevent inadvertent drops into critical areas. For example, a wrench dropped into cooling water at a nuclear facility may require shut down of the system so that the wrench can be retrieved. For this reason, the facility may require that all hand tools be tethered to the worker.
For convenience, some workers use a retractable tether to secure hand tools to their person. A free end of a retractor is attached to the hand tool and the retractor is attached to the worker by a belt clip or being housed within a retractor pocket. One example of such a retractable tether is a retractable key ring, where the retractor body clips onto the user's belt or waist band. Keys (or other light-weight object) are secured to the free end of the retractor cable. Another example is a retractor retained within a leather pocket on a tool pouch, where the pouch is part of a tool belt. A free end of the retractor cable extends through an opening in the tool pouch and is secured to a hand tool. In the tool pouch configuration, the retractor is often housed in a pocket adjacent to a tool slot or tool pocket.
A limitation of retractable tethers is its usefulness for tools only below a given weight. For example, some retractable reels for keys and small tools have a maximum capacity of 8 to 10 ounces (225-280 grams). While this may be sufficient for keys, the load may be easily exceeded with a small hand tool. If the tool is dropped, the retractor mechanism can be damaged by the force exerted on the retractor when the tool reaches the bottom of its fall.
As the capacity of retractors increases, so does the size, weight, and price of the retractor. For example, a retractor with a weight rating of 5 pounds typically has a steel cable, steel housing, and an overall size and weight that is undesirable for a worker to carry on his person throughout the work day. Retractors of lighter weight may have a maximum load rating of 1.5 to 2 pounds (0.7-0.9 Kg.) A dropped tool can easily exceed this load rating.
Therefore a need exists for improved weight rating in hand tool retractors without the disadvantages of excessive size and weight.
The present invention achieves these and other objectives by providing a retractor cover having a cover body or body portion that defines a retractor compartment where the cover body or body portion is made of a stretchable and resilient material, and retractor cable opening, where the retractor cover can be attached to a worker or structure and is constructed to house a retractor in the retractor compartment. Having the cover body or body portion made of a stretchable and resilient material provides an increased holding weight to a hand tool retractor. For example, one embodiment of the retractor cover of the present invention increases a hand tool retractor having a weight rating of 1 pound (453.6 grams) to one having at least 2 pounds (907 grams).
In one embodiment, a hand-tool retractor cover has a body portion and a handle portion. The body portion has a first-side wall, a second-side wall spaced apart from and substantially parallel to the first-side wall, and a perimeter wall extending transversely between and connecting the first-side wall to the second-side wall. The body portion has a wall thickness and defines a retractor compartment substantially enclosed by the first-side wall, the second-side wall, and the perimeter wall. The body portion defines an entrance into the retractor compartment and a retractor cable opening. The handle portion is attached to and extending from the body portion and defines a handle opening. The handle portion has a handle thickness that is greater than the wall thickness, thereby rendering the body portion more stretchable than the handle portion. At least one of the body portion and the handle portion is made of a stretchable and resilient material adapted to increase a weight rating of a hand tool retractor when a hand tool retractor is placed within the hand tool retractor cover.
In another embodiment, the entrance comprises a slot along a top side of the perimeter wall. The handle portion includes a first handle portion extending from a top side of the body portion and adjacent the slot, where the first handle portion defines a first handle opening. The handle portion also includes a second handle portion extending from the top side of the body portion and adjacent the slot, where the second handle portion defines a second handle opening. The first handle opening and the second handle opening are aligned with each other and comprise the handle opening. The first handle portion and the second handle portion are separable such as by pulling away from the entrance in opposite directions to permit access to the retractor compartment via the entrance.
In another embodiment, a hand-tool retractor cover includes a body portion having a first-side wall, a second-side wall spaced apart from and substantially parallel to the first-side wall, and a perimeter wall extending transversely between and connecting the first-side wall to the second-side wall. The body portion has a wall thickness and defines a retractor compartment between the first-side wall, the second-side wall, and the perimeter wall. The body portion defines an entrance into the retractor compartment and a retractor cable opening opposite the entrance. A handle portion has a first handle portion and a second handle portion. The first handle portion has a first handle thickness and extends from the body portion adjacent the first-side wall. The first handle portion defines a first handle opening therethrough. The second handle portion has a second handle thickness and extends from the body portion adjacent the second-side wall. The second handle portion defines a second handle opening therethrough. The first handle portion and the second handle portion extend from the body portion from opposite sides of the entrance in substantially parallel relation with the first handle opening aligned with the second handle opening. The retractor cover is made of an elastomer adapted to increase a weight rating of a hand tool retractor when a hand tool retractor is placed within the hand tool retractor cover. The first handle thickness and the second handle thickness are each greater than the wall thickness, thereby rendering the body portion more stretchable than the handle portion.
In some embodiments, the stretchable and resilient material is a silicone rubber with a durometer from about 30 to about 70 on a Shore-A hardness scale.
In some embodiments, the body portion is made of the stretchable and resilient material. In another embodiment, the body portion and the handle portion are a monolithic structure made of the stretchable and resilient material.
In some embodiments, the hand-tool retractor cover includes a tool-holding clip attached to the body portion.
In some embodiments, the hand-tool retractor cover includes a magnetic member retained by the body portion.
In some embodiments, the hand-tool retractor cover includes closed-loop connector extending through the handle opening, such as a strap made of a stretchable material and defining a closed loop, a carabiner, a screw link, or a shackle.
In some embodiments, the hand-tool retractor cover includes a retractor disposed in the retractor compartment, where the retractor has a retractor body and a retractor cable. The retractor body is snugly received in the retractor compartment with the retractor cable extending through the retractor cable opening.
In some embodiments, the hand-tool retractor cover includes a permanent magnet retained by the body portion. For example, the permanent magnet has a size sufficient to retain a ferrous hand tool. In some embodiments, the permanent magnet is seized to retain a ferrous hand tool with a hand tool weight of at least eight ounces.
In some embodiments, the first handle thickness and second handle thickness are each at least 3 times as great as the wall thickness of the body portion. In one embodiment, the wall thickness is about 0.08 inch.
In some embodiments, the hand-tool retractor cover and the retractor are provided as a combination, where the retractor may be installed into the retractor compartment of the retractor cover.
Another aspect of the present invention is directed to the combination a retractor and a hand-tool retractor cover. In one embodiment of the combination, the hand-tool retractor cover includes a body portion having a first-side wall, a second-side wall spaced apart from and substantially parallel to the first-side wall, and a perimeter wall extending transversely between and connecting the first-side wall to the second-side wall. The body portion defines a retractor compartment between the first-side wall, the second-side wall, and the perimeter wall. The body portion defines an entrance into the retractor compartment and a retractor cable opening. A handle portion is attached to and extends from the body portion and defines a handle opening. The retractor cover is made at least in part of a stretchable and resilient material. The hand-tool retractor includes a retractor body and a retractor cable selectively deployable from the retractor body. The stretchable and resilient material is adapted to increase a weight rating of the hand tool retractor when the hand tool retractor is placed within the hand tool retractor cover with the retractor cable deployable through the retractor cable opening.
In one embodiment, the hand-tool retractor cover increases the weight rating by at least 40% a maximum weight without failure of the hand-tool retractor when the hand-tool retractor is disposed in the retractor compartment
In another embodiment, the stretchable and resilient material is a silicone rubber with a durometer from about 30 to about 70 on a Shore-A hardness scale.
In another embodiment, the hand-tool retractor includes a closed-loop connector extending through the handle opening, such as a strap made of a stretchable material and defining a closed loop, a carabiner, a screw link, or a shackle.
In another embodiment, a split key ring is connected to a free end of the retractor cable, where the split key ring has a weight rating no greater than the weight rating of the retractor when installed in the retractor cover and where the split key ring is adapted for connection to a lanyard or tether.
Another aspect of the present invention is directed to a method of increasing the weight rating of a hand tool retractor. In one embodiment, the method includes providing a retractor cover made at least in part of a stretchable and resilient material, where the retractor defines a compartment and a retractor cable opening in communication with the compartment, providing a hand tool retractor with a retractor cable, and disposing the hand tool retractor in the compartment of the retractor cover with the retractor cable extending through the retractor cable opening, where the retractor cover absorbs some of the forces of a dropped hand tool connected to the retractor cable.
In another embodiment, the method includes providing a retractor having a retractor body and a retractor cable selectively deployable from the retractor body; providing a retractor cover that includes a body portion and a handle portion attached to and extending from the body portion. The body portion has a first-side wall, a second-side wall spaced apart from and substantially parallel to the first-side wall, and a perimeter wall extending transversely between and connecting the first-side wall to the second-side wall to define a retractor compartment. The body portion defines an entrance into the retractor compartment and also defines a retractor cable opening. The handle portion is made of a flexible and resilient material and defines a handle opening. The method also includes installing the retractor body into the retractor compartment with the retractor cable selectively deployable through the retractor cable opening; connecting the retractor cover to a worker or structure via the handle portion; and connecting a free end of the retractor cable to a hand tool to be tethered. In some embodiments, the retractor compartment is sized and shaped to snugly receive the retractor body.
In another embodiment, the step of providing the retractor cover includes selecting the retractor cover to include a strap defining a closed loop that extends through the handle opening, where the strap made of a stretchable material.
In another embodiment, the step of providing the retractor cover includes selecting the retractor cover made as a monolithic structure of silicone rubber with a durometer from about 30 to about 70 on a Shore-A hardness scale. In one embodiment, the retractor cover is selected with a Shore-A durometer of about 40.
In another embodiment, the step of providing the retractor cover includes selecting the retractor cover with the entrance defined as an opening or slot along a top side of the body portion and with the handle portion comprising a first handle portion and a second handle portion each connected to and extending from a top side of the body portion adjacent the entrance.
In another embodiment, the step of providing the retractor cover includes selecting the retractor cover to include a magnetic member retained by the body portion.
In another embodiment, the step of providing the retractor cover includes selecting the retractor cover to include a tool-holding clip secured to the body portion and extending along an outside surface of the first-side wall.
In another embodiment, the method also includes the steps of (i) selecting a split key ring with a weight rating no greater than the weight rating of the retractor when installed in the retractor cover and (ii) connecting the split key ring between the free end of the retractor cable and the tool to be tethered. Deformation of the split key ring indicates the retractor has been subjected to forces of a dropped tool.
The preferred embodiments of the present invention are illustrated in
Body portion 106 of retractor cover 100 has a first-side wall 110 and a second-side wall 112 spaced apart from and substantially parallel to first-side wall 110. A perimeter wall 114 (also referred to as a perimeter sidewall 114 in some embodiments) extends transversely between and connects first-side wall 110 to second-side wall. First-side wall 110, second-side wall 112, and perimeter wall 114 define and generally enclose an open retractor compartment 120 (shown more clearly in
In other embodiments, handle portion 104 is made of a hard plastic, metal, carbon fiber, fiberglass or other rigid or semi-rigid material lacking the elasticity of silicone rubber. In such an embodiment, the elastomeric material of body portion 106 stretches to absorb forces of a dropped tool connected to a retractor 10 disposed in retractor compartment 120 while handle portion 104 provides structural integrity to maintain retractor cover 100 connected to a worker or to equipment.
In one embodiment, entrance 122 is an opening along a top side 101 of body portion 106, such as a slit along perimeter wall 114. Optionally as shown in
Retractor cable opening 124 is typically positioned along a bottom side 102 of retractor cover 100, but may be in other locations depending on the retractor geometry and the intended use of retractor cover 100. In one embodiment, retractor cable opening 124 is a round or oval opening through bottom side 102 of body portion 106 and is sized to permit passage of retractor cable 14. Optionally, retractor cable opening 124 is sized to also accommodate crimp 16 or other fastener on retractor cable 14.
Handle portion 104 is connected to and extends from body portion 106 of retractor cover 100. In one embodiment, handle portion 104 includes a first handle portion 104a and a second handle portion 104b extending from a top side 101 of perimeter wall 114 adjacent entrance 122. For example, first handle portion 104a is located on one side of entrance 122 towards first-side wall 110 and second handle portion 104b is on the opposite side of entrance 122 towards second-side wall 112, where first and second handle portions 104a, 104b are slightly spaced apart and extend together in alignment from body portion 106. First and second handle portions 104a, 104b may be pulled away from each other transverse to entrance 122 in opposite directions to make accessible and open entrance 122 for installation of retractor 10 in retractor compartment 120.
In one embodiment, first handle portion 104a extends further from body portion 106 than second handle portion 104b so that first handle portion 104a may pass through second handle opening 107b with sufficient length after doing so for attachment to the user by connecting a closed-loop connector 180 (shown in
Handle portion 104 defines a handle opening 107. For example, first handle portion 104a defines first handle opening 107a and second handle portion defines second handle opening 107b that are aligned with one another. In one embodiment, handle portion 104 has an arch shape or convexly curved shape. An advantage of such as shape is that when subjected to a tensile stress, the arch shape resists catching on clothing and tends to distribute the stress more evenly across handle portion 104. As believed to more evenly distribute drop forces to body portion 106, handle portion in some embodiments is attached along most or all of a width W of top side 101 of body portion 106.
In one embodiment, retractor cover 100 is made of silicone rubber with a Shore-A durometer of 42, where each of handles 104a, 104b has a thickness T of about 0.2 inch (5.0 mm), a width W2 of about 0.3 inch (7.7 mm) measured horizontally from handle opening 107, and a height H of about 0.4 inch (10.5 mm) measured vertically from handle opening 107. Body portion 106 has a wall thickness of about 0.8 inch (2 mm).
Handle portion 104 (or entire retractor cover 100) is made of a stretchable and resilient material, such as a rubber or elastomer with a durometer of 30-70 on a Shore-A hardness scale. In some embodiments, handle portion 104 is monolithic with body portion 106, where retractor cover 100 is made as a single unit with a flexible and resilient material such as silicone rubber. As such, retractor cover 100 permits easy installation of retractor 10 into retractor compartment 120. Also, such a material absorbs forces of a dropped hand tool connected to retractor 10 since all or part of retractor cover 100 stretches when subjected to the force of a dropped tool. Particularly, handle portion 104 stretches and resumes its shape to absorb the forces of a dropped tool or other object. Further, when body portion 106 of retractor cover 100 is made of a soft rubber, it prevents scratching and reduces impact forces when knocked against other items, such as metal scaffolding.
The material and its hardness for retractor cover 100 may be selected based on the weight rating of the retractor 10, operating temperature, materials used to build retractor 10, and dimensions of those materials. For example, a retractor 10 rated for a load of 2 lbs. (0.9 Kg) in drop tests with a weight of 4.5 lbs. (2.045 Kg) failed on the second drop due to a broken retractor cable 14 when retractor cover 100 has a Shore-A durometer of 50. By reducing the Shore-A durometer to 30, failure occurred instead on the third drop with 4.5 lbs. (2.045 Kg) when retractor 10 pulled through retractor cable opening 124. For the retractor 10 that broke with 2.0 lb. loads when tested without retractor cover 100, it was found experimentally that a Shore-A durometer of 42 for retractor cover 100 provided a desirable balance between failure of the retractor 10 components and failure of the retractor cover 100 and enabled failure-free drops using weights of 4.5 to 6.0 lbs. (˜2.0-2.7 Kg.) Thus, it is sometimes preferable to increase the Shore-A durometer of retractor cover 100 for retractors 10 with a higher load rating or stronger cable assemblies.
In one embodiment, first-side wall 110 includes a resilient tool-holding clip 130. For example, tool-holding clip 130 is attached to first-side wall 110 near bottom side 102 and extends upward towards handle portion 104. Tool-holding clip 130 may also extend in a downward, sideways, or other direction, but typically extends upward to discourage its use as a belt clip for retractor cover 100 since such use may defeat some benefits of retractor cover 100. Tool-holding clip 130 is useful to capture and hold objects, such as a small hand tool or connector 18 on retractor 10. In some embodiments, tool-holding clip 130 is made of rubber or other flexible and resilient material. Depending on its material of construction, tool-holding clip 130 may be adhered or welded to body portion 106, formed monolithically with body portion 106, or otherwise attached to body portion 106.
Referring to
In other embodiments, retractor 10 includes clip body portion 132 attached to retractor body 12 and extending downward toward retractor cable 14. For such retractors 10, retractor cover 100 has clip opening 131 positioned near top side 101 of body portion 106. During installation, clip body portion 132 passes through clip opening 131 near top side 101 of body portion 106 as retractor 10 is inserted into retractor compartment 120.
Referring now to
Referring now to
Referring now to
Strap 150 may be a length of webbing or strip of material, such as woven or non-woven materials and strips of leather, plastic, rubber, elastic, metal, or other material. In some embodiments, strap 150 is made of a stretchable material, such as an elastic strap or fabric containing elastic. In one embodiment, for example, strap 150 is made from a length of woven cotton elastic or woven polyester elastic with a width of about one inch. In other embodiments, strap 150 is substantially non-stretchable and is made of woven nylon webbing, a length of plastic or leather, or the like. An advantage of strap 150 being stretchable is that strap 150 also absorbs forces of a dropped tool connected to retractor 10 disposed in retractor cover 100.
Referring now to
For example, a split key ring may expand in size or become oblong in shape after one or more drops. In a drop test included in the data below, drops resulted in no failure of retractor 10 or to retractor cover 100. However, connector 18 (a split key ring) expanded in diameter by 75% compared to its original size. This visual change in appearance signals to the user that the retractor 10 inside retractor cover 100 has been subjected to drop forces and may be damaged or prone to failure.
In one embodiment, retractor cover 100 is made of silicone rubber with a Shore-A durometer of 42, where each of handles 104a, 104b defines handle opening 107 with a diameter of about 0.5 inch (12.7 mm), and has a handle thickness T of about 0.27 inch (6.85 mm), a width W2 of about 0.53 inch (13.4 mm) measured horizontally from handle opening 107, and a height H of about 0.36 inch (9.1 mm) measured vertically from handle opening 107 to a top 104c of handle portion 104. Body portion 106 has a wall thickness of about 0.08 inch (2.03 mm).
As shown in the embodiment of
Referring now to
In step 510, a retractor cover 100 is provided, where retractor cover 100 has body portion 106 sized and shaped to house retractor body 12 in retractor compartment 120 defined within retractor body 106 and allow removal and insertion of retractor 10 into retractor compartment 120. Retractor cover 100 is constructed to increase the dropped-tool holding strength of retractor 10 compared to its pre-defined weight rating or dropped-tool holding strength. Body portion 106 defines entrance 122 sized for installation of retractor body 106 into retractor compartment 120 as well as retractor cable opening 124 for deployment of retractor cable 14 therethrough. Retractor cover 100 also has a handle portion 104 attached to body portion 106 and defining handle opening 107. Handle portion 104 is made of a stretchable, resilient material. In some embodiments, retractor cover 100 is selected with body portion 106 and handle portion 104 made as a monolithic structure made of a rubber or the like with a durometer of from about 30 to about 70 on a Shore-A hardness scale. In some embodiments, retractor cover 100 is selected to include strap 150 defining a closed loop extending through handle opening 107. In some embodiments, strap is selected as a length of stretchable material, such as elastic webbing. The stretchable material further enables retractor cover 100 to absorb the forces of a dropped tool, thereby increasing the weight rating of retractor 10. In some embodiments, retractor cover 100 is selected to include a magnetic member 170 or tool-holding clip 130 positioned to engage and retain a hand tool.
In step 515, retractor 10 is installed in retractor cover 100 with retractor body 12 retained in retractor compartment 120 and retractor cable 14 extending through and operable through retractor cable opening 124. In embodiments where handle portion 104 includes first and second handle portions 104a, 104b, installing retractor 10 in retractor cover 100 includes spreading first and second handle portions 104a, 104b apart to open entrance 122 located between them along a top side 101 of body portion 106. Retractor 10 is then inserted through entrance 122 and positioned as needed so that retractor cable 14 extends through retractor cable opening 124. In other embodiments, retractor body 106 is stretched or temporarily deformed to enable retractor 10 to be installed in retractor compartment 120.
In step 520, retractor cover 100 with retractor 10 is secured to a worker, structure, or other object. In one embodiment, step 520 is performed by looping a length of strap 150 through handle opening 107 and also through another connector or around a tool belt, scaffolding, support, or other item. In other embodiments where retractor cover 100 includes strap 150 extending through handle opening, a connector is attached to strap 150 and also to the worker or other object to secure retractor cover 100 with retractor 10. For example, a carabiner, screw link, split ring, spring clip, or other connector is attached to strap 150 and enables the user to releasably attach retractor cover 100 with retractor 10 as desired to the worker or other object.
In step 525, retractor cable 14 is connected to a hand tool or other object to be tethered. In some embodiments, the hand tool or object is magnetic. Optionally, step 525 includes connecting a split key ring connector 18 between retractor cable 14 and the tool to be tethered. The construction of a split key ring results in deformation or an increase in size when subjected to drop forces. Therefore, a change in appearance of the split key ring can be used to indicate to the user that the retractor 10 has been subjected to forces of one or more tool drops (usually several drops) and that retractor 10 should be retired from service due to unseen damage or weakening of retractor 10 components.
Depending on the retractor cover provided, the hand tool or other object is positioned to engage a disk-shaped magnetic member 170 or a tool-holding clip 130. For example, a steel tool is placed directly or indirectly against magnetic member 170 to hold the tool when it is not in use. This storage option avoids retractor cable 14 deploying due to the weight of the tool when the tool hangs freely from retractor 10. Similarly, the tool may be installed between tool-holding clip 130 and body portion 106 to store the tool.
In use, retractor cover 100 increases the weight rating of retractor 10 by absorbing the force of a dropped tool. Due to the flexible and resilient material used for handle portion 104 (and body portion 106 in some embodiments), handle portion 104 stretches when a tool is dropped and reaches the end of the length of retractor cable 14. When equipped with a stretchable strap 50, strap 50 further absorbs the force of a dropped tool. By absorbing some of the force of a dropped tool, retractor cover 100 effectively increases the weight rating of retractor 10.
Drop tests were performed using retractors 10, where a predefined amount of weight was secured to the free end of the extended retractor cable 14 and then dropped from above the retractor 10 a total drop distance of 96 inches (2.43 m). Placing the weight above the retractor 10 was performed to more closely reflect actual use since the retractor 10 is typically attached to a tool belt around a worker's waist while the tethered tool in use is typically above the waist. In such a scenario, the tethered tool would drop from above the retractor to below the retractor. Drop tests were useful to determine the weight at which retractor 10 failed. Failure of the retractor 10 is typically exhibited by damage resulting in inoperability of the retractor 10.
Several retractors 10 were evaluated at room temperature with and without being installed in retractor cover 100. When installed in retractor cover 100, retractor 10 is snugly received in compartment 120. Retractor covers 100 as in
When tested without retractor cover 100, retractor 10 could withstand drops without failure with a maximum weight of about 1.75 pounds (0.8 Kg.) Using retractor cover 100 with a durometer of 70, the maximum weight without failure of retractor 10 increased to 3.5 pounds (1.6 Kg), which is an increase of 100%. Using retractor cover 100 with a durometer of 50, the maximum weight increased to 4.5 pounds (2.05 Kg.), which is an increase of 157%.
Additional drop tests were performed for retractor covers 100 having other durometers. Results of these drop tests are shown in Table 2 below. Each test was performed at room temperature using a retractor 10 with or without retractor cover 100. The retractors 10 in these experiments were the same retractors as used in the drop tests of Table 1. Retractor covers 100 with Shore-A durometers of 30, 40, 45, and 50 were tested with a weight of 4.5 lbs. (2.05 Kg.) Weights were dropped from a point above the retractor for a total drop distance of 96 inches (2.43 m).
Retractors 10 were also tested without a retractor cover 100 using weights of 1.75 lb. (0.8 Kg.) and 2.0 lbs. (0.9 Kg.). Results of these tests are also shown in Table 2. Retractors 10 failed with a 2.0 lb. (0.9 Kg.) weight, but passed with a 1.75 lb. (0.8 Kg.) weight. Thus, for the tested retractors, the maximum weight without retractor failure is about 1.75 lbs. (0.8 Kg) when the weight is dropped a total distance of 96 inches (2.43 m).
As shown in Table 2, retractor covers 100 with a durometer from 30 to 50 all passed with a weight of 4.5 lbs. (2.05 Kg.), an increase of at least 155% in the retractor weight rating compared to the retractor without retractor cover 100. For failures that did occur after multiple drops when the retractor was disposed in a retractor cover 100, the type of failure observed was different for retractor covers 100 of different durometers. For example, for retractor cover 100 with a durometer of 30, failure occurred when the retractor 10 pulled through the retractor cable opening 124. For retractor cover 100 with a durometer of 50, failure occurred by the retractor cable breaking.
Further drop tests were performed using retractor cover 100 with a durometer of 40 and having a strap 50 made installed through handle opening 107 as shown in
Still further drop tests were performed using a 2.2 mm×30 mm split key ring connected between the retractor cable 14 and the weight. The split key ring has a load rating no greater than the retractor 10 installed in the retractor cover 100. The retractors 10 were disposed in a retractor cover 100 with a durometer from 30 to 50. The results of these tests are shown in Table 3 below. These tests evaluated changes to the key ring after three drops, where deformation or failure of the split key ring indicates the retractor 10 has been subjected to forces of a dropped tool.
Still further, tensile force tests were performed using a retractor cover 100 with a Shore-A durometer of 40 and the same model retractor as used in other tests discussed above. The retractor 10 pulled through cable opening 124 of retractor cover 100 at 45 lbs. (20 Kg) where cable opening 124 has a first diameter of 0.4 inch (10 mm) and a second diameter of 0.2 inch (5 mm).
Embodiments of retractor cover 100 of the present invention have the advantage of significantly increasing the dropped-tool holding strength of a retractor 10 when the retractor 10 is disposed in a retractor cover 100 where a hand tool is attached to the free end of the retractor cable extending through the retractor cable opening 124. As shown experimentally, the maximum weight is increased 100% or more for a retractor 10 that by itself breaks with a 2.0 pound weight. When the hand tool is dropped, the stretchable and resilient material of retractor cover 10 deforms to absorb forces of the dropped tool and reduce the force of the dropped tool sustained by the retractor 10. Connecting retractor cover 100 to the worker or to a structure using an elastic strap 50 looped through the handle portion 104 has been shown experimentally to further increase the maximum weight of the hand tool that may be used with retractor 10 without causing damage to the retractor 10 when the tool is dropped.
Although the preferred embodiments of the present invention have been described herein, the above description is merely illustrative. Further modification of the invention herein disclosed will occur to those skilled in the respective arts and all such modifications are deemed to be within the scope of the invention as defined by the appended claims.
