This disclosure relates generally to lifting devices and, more particularly, to an ergonomically configured apparatus or tool for lifting a hinged lid, maintaining the hinged lid in an open position, closing the hinged lid and otherwise handling the hinged lid.
Hinged lids of the type described herein are generally used for covering holes in the ground that provide access to underground electrical, air, water and other utility hookups, such as manhole covers, vault doors, storm grates and the like. These types of lids may be circular or rectangular in shape and have a hinged end or edge that is hingedly affixed to the ground and an opposing non-hinged end or edge that is free to permit lifting the hinged lid about the hinged end for access to the underground utilities. A hand grip, slot or hole is provided at or near the non-hinged end or edge for workers to insert their hands, a crowbar or a hook into and then to pull up on the lid, thus requiring that the worker pull up on the lid while bending over. Hinged lids of these types are made of metal, have a diameter of about 16 inches or more and a weight of about 60 pounds or more depending on the application, and therefore require substantial force to open the lid. Hinged lids also do not have a latch or other means to keep the lids in an open position, and can fall closed if not properly handled.
Several lid lifters are available for lifting non-hinged manhole covers and the like, but such known lid lifters do not sufficiently reduce the force needed to open the cover or provide any means for ergonomically and safely maintaining the cover in an open position or closing the cover.
An ergonomically configured apparatus or tool for handling a hinged lid is disclosed that reduces lifting force required to open the hinged lid from a closed position and bending by a user, maintains the lid in an open position to prevent accidental closure of the lid, and assists with lifting and closing the lid in a controlled manner. The tool allows an operator to easily insert the tool into a hand grip, slot or hole in an existing type of hinged lid and to pull a handle on the tool back toward the operator to open the hinged lid with minimal physical exertion, all while the operator is in a standing position behind and off to the side of the open hole.
In accordance with some aspects of the disclosure, the tool has a horizontal member with an attachment means for removably coupling the apparatus to the hinged lid, a vertical member extending from a proximal end of the horizontal member in a generally vertical direction forward of an axis orthogonal to the horizontal member, and a handle in operable communication with a distal end of the vertical member.
In other aspects of the disclosure, the vertical element and handle are ergonomically configured relative to the horizontal member to make lifting the hinged lid from a closed position, maintaining the hinged lid in an open position, and closing the hinged lid easier with reduced lifting force required. The generally vertical direction of the vertical member forms an acute angle between the vertical member and the horizontal member of about 79° to 81°, such that the vertical member has a forward bend that is about 9° to 11°, for example about 10°, forward of an axis orthogonal to the horizontal member. In an open position, the vertical member is positioned to lay flat on the surface surrounding a manhole cover, vault door, storm grate or the like, and the forward bend of the vertical member relative to the horizontal member reduces forces necessary to open the hinged lid from a closed position and maintains the hinged lid at an angle greater than 90° relative to the open hole that the hinged lid was covering.
The vertical member is configured with a length that positions the handle about 36-42 inches from the horizontal member to provide an operator with greater leverage for lifting the hinged lid from a closed position and a comfortable, neutral, ergonomic position where an operator can position his/her arm in a 90° angle without elevating or dropping the arm to grasp the handle.
The handle is positioned to form an obtuse angle relative to the vertical member in the range of about 155° to 170°, such that the handle, when combined with the forward bend of the vertical member, is positioned at an angle of about 20° to 35° forward of the axis orthogonal to the horizontal member, to assist an operator in grasping the handle when the hinged lid is an open position. In the open position, the handle forms an acute angle between the handle and the surface in a range of about 10° to 25°, so that the handle is elevated off the surface by about 10° to 25° and is easy to grasp.
The tool optionally includes an anti-slip extension that prevents the tool from slipping out of the hand grip, slot or hole in the hinged lid, particularly when the hinged lid is closed too fast or slams shut. The anti-slip extension may be positioned in operable communication with the distal end of the horizontal member and has a length that extends beyond the non-hinged end or edge of the hinged lid.
In accordance with another aspect of the disclosure, a method for making an apparatus or tool for handling a hinged lid of the type described above is provided. In the method, a horizontal member is provided with an attachment means for removably coupling the apparatus to the hinged lid, a vertical member is extended from a proximal end of the horizontal member in a generally vertical direction forward of an axis orthogonal to the horizontal member, and a handle is positioned in operable communication with a distal end of the vertical member. The generally vertical direction of the vertical member is formed as an acute angle between the vertical member and the horizontal member of about 79° to 81°, for example about 80°, such that the vertical member has a forward bend that is about 9° to 11°, for example about 10°, forward of an axis orthogonal to the horizontal member. The handle is positioned to form an obtuse angle relative to the vertical member in the range of about 155° to 170°, such that the handle, when combined with the forward bend of the vertical member, is positioned at an angle of about 20° to 35° forward of the axis orthogonal to the horizontal member. In the method, the tool can optionally be configured with an anti-slip extension positioned in operable communication with the distal end of the horizontal member and having a length that extends beyond the non-hinged end or edge of the hinged lid.
In yet other aspects of the disclosure, a method for handling a hinged lid using an apparatus or tool for handling a hinged lid of the type described above is provided. The method comprises the steps of removably coupling an attachment means of a horizontal member of a hinged lid handling apparatus to a non-hinged end of the hinged lid, such that a connection point between the horizontal member and a vertical member extending in a generally vertical direction from a proximal end of the horizontal member is positioned proximate to a hinged end of the hinged lid, and pulling a handle in operable communication with a distal end of the vertical member to lift the non-hinged end of the hinged lid. The method includes the further steps of positioning the vertical member on a flat surface, such that the hinged lid is maintained in an open position having an angle greater than 90° relative to an opening the hinged lid was covering and positioning the handle such that, in the open position, the handle forms an acute angle between the handle and the flat surface in a range of about 10° to 25°.
The features, functions and advantages that have been discussed, as well as other objects, features, functions and advantages of the apparatus or tool for handling a hinged lid can be achieved independently in various examples of the disclosure or may be combined in yet other examples, further details of which can be seen with reference to the following description and drawings.
In the following detailed description and the drawing figures, illustrative examples of an ergonomically configured hinged lid handling tool 10 for handling a hinged lid 12 that reduces lifting force required to open the hinged lid 12 from a closed position and bending by a user, maintains the hinged lid 12 in an open position to prevent accidental closure of the hinged lid 12, and assists with lifting and closing the hinged lid 12 in a controlled manner are described. The description is merely exemplary in nature and is not intended to limit the disclosed hinged lid handling tool or apparatus and related methods, or the application and uses of the hinged lid handling tool or apparatus and related methods. It will be recognized by one skilled in the art that the present disclosure may be practiced in a variety of applications or environments and/or with other analogous or equivalent variations of the illustrative examples. For example, the concepts and teachings disclosed herein may be applied to devices for lifting any type of hinged lid.
It should be noted that those methods, procedures, components, or functions which are commonly known to persons of ordinary skill in the field of the disclosure are not described in detail herein. A person skilled in the art will appreciate that in the development of an actual embodiment, numerous implementation-specific decisions must be made to achieve the developer's specific goals, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art after having the benefit of this disclosure.
Referring to
The tool 10 is ergonomically configured for handling a hinged lid 12 in ways that reduce the lifting force required to open the hinged lid 12 from a closed position, in one example reducing the force required to move a 60 pound lid preferably to less than or equal to about 16 pounds of pull force, avoid the need for an operator to bend while lifting the hinged lid 12, maintain the hinged lid 12 in an open position (as shown for example in
Referring to
The vertical member 16 is configured to have a length of about 36 to 42 inches from the horizontal member 14 to provide an operator with greater leverage for lifting the hinged lid 12 from a closed position and a comfortable, neutral, ergonomic body position where an operator can position their arm in a 90° angle without elevating or dropping the arm to grasp the handle 22 to lift the hinged lid 12 from the closed position. The handle 22 can be formed as a simple bend proximate the distal end 24 of the vertical member 16 or can be a separate piece that is welded to the distal end 24 of the vertical member 16. The handle 22 has a length of between about 4 to 9 inches, and has an aperture 30 formed through the handle 22 proximate an outer edge 32 of the handle 22 to form a grip. The width of the horizontal member 14 and vertical member 16 can be adjusted based on the weight of the hinged lid 12 that it is designed to lift, and is preferably at least 4 inches, and more preferably about 4 to 6 inches.
The foregoing configuration of the horizontal member 14, vertical member 16 and the handle 22 provide ergonomic advantages to make lifting the hinged lid 12 from a closed position, maintaining the hinged lid 12 in an open position, and closing the hinged lid 12 easier with reduced lifting force required, preferably to less than 16 pounds of pull force.
In accordance with one method 100 for handling a hinged lid 12 using the tool 10, referring to
A C-grip 26A type of attachment means 26 is shown in
A wave-grip 26B type of attachment means 26 is shown in
A J-grip 26C type of attachment means 26 is shown in
In step 104 of the method 100, after the tool 10 is removably secured to the hinged lid 12, an operator, standing behind the tool 10, can pull the handle 22 back toward himself to begin lifting the non-hinged end 36 of the hinged lid 12, as shown in
In step 108 of the method 100, further advantage is realized by the ergonomic positioning of the handle 22 when the hinged lid 12 is in the open position. The handle angle H relative to the axis 20 orthogonal to the horizontal member 14 also elevates the handle 22 away from the surface 56 when the vertical member 16 is flat on the surface 56 and the hinged lid 12 is in the open position. This configuration forms an acute surface angle S between the handle 22 and the surface 56 in the range of about 10° to 25° and assists the operator in grasping the handle 22 when the hinged lid 12 is the open position so that it can be carefully handled to move to the closed position.
The tool 10 optionally includes an anti-slip extension 58 that prevents the tool 10 from slipping out of the hand grip 34 in the hinged lid 12, particularly if the hinged lid 12 is closed too fast or slams shut, for example if the operator loses grip of the handle 22. The anti-slip extension 58 provides for additional safety and protection of the tool 10, the hinged lid 12 and other equipment. The anti-slip extension 58 may be positioned in operable communication with the distal end 44 of the horizontal member 14 and has a length that extends beyond the non-hinged end 36 of the hinged lid 12. The anti-slip extension 58 may be formed as an integral part of the horizontal member 14 (for example, as shown in
The tool 10 may be reinforced, particularly when lifting hinged lids 12 having a weight greater than 60 pounds, to increase the strength and support of the horizontal member 14 and vertical member 16, as well as the handle 22, and to prevent bending or collapse of the handle 22 and flex in the vertical member 16. The reinforcements may also enable the use of thinner and lighter weight materials. For example, a vertical stiffener 60 may be welded or otherwise affixed to an internal surface 62 of the vertical member 16, and made from the same type of strong, lightweight material used for the other elements of the tool 10. A horizontal stiffener 64 may also be welded or otherwise affixed to an upper surface 66 of the horizontal member 14, and made from the same type of strong, lightweight material used for the other elements of the tool 10. In most configurations of the tool 10, the vertical stiffener 60 will provide sufficient reinforcement. The horizontal stiffener 64 would typically be used only for lifting hinged lids having a weight of greater than 60 pounds. The vertical stiffener 60 and horizontal stiffener 64 extend at least a portion of the length of the vertical member 16 and horizontal member 14, respectively.
Side supports 68 may also be secured in operable communication with the sides 70 of both the horizontal member 14 and the vertical member 16, by welding or other known technique, to provide additional strength and stability to the tool 10. The side supports 68 have a triangular shape with interior angles corresponding to the acute angle A between the horizontal member 14 and vertical member 16, and may include holes 72 to reduce the weight of the side supports 68. The tool 10 preferably has a weight less than 10 pounds.
In one example, the elements of the tool 10 have the following dimensions:
While the tool 10 has been described with reference to various embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the teachings herein. For example, and without limitation, the materials, sizes of the elements of the tool 10 and other features may be modified to adapt the concepts and reductions to practice disclosed herein to a particular situation. Accordingly, it is intended that all such modifications and variations be considered as within the spirit and scope of this disclosure, as defined in the following claims, and that the subject matter covered by the claims not be limited the disclosed embodiments. The process claims set forth hereinafter should not be construed to require that the steps recited therein be performed in the order in which they are recited or in alphabetical order (any alphabetical ordering in the claims is used solely for the purpose of referencing previously recited steps).
Number | Name | Date | Kind |
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4365925 | Girtz | Dec 1982 | A |
4482182 | Mortensen | Nov 1984 | A |
Entry |
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E-Z Puller manhole removal tool, https://www.ezpuller.net/product/e-z-puller/ printed on Feb. 1, 2017. |
Manhole Cover Hook, 36 In, Cherne, https://www.zoro.com/cherne-manhole-cover-hook-36-in-251-438/i/G4195877/?gclid=CLuAg-Hb2s8CFc6Xfgodfr4KYA&gclsrc=aw.ds, printed on Feb. 1, 2017. |
Salvus Hybrid Lid Lifter, Allied Safety, http:///www.alliedsafety.com.au/products.htlm#1, printed on Feb. 1, 2017. |
Allegro Deluxe Manhole Lid Lifter, Product #389940120, http://www.whitecap.com/shop/wc/p/allegro-deluxe-manhole-lid-lifter-9401-20#ProductDetails, printed on Feb. 1, 2017. |
Number | Date | Country | |
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20180229990 A1 | Aug 2018 | US |