The present invention relates generally to a lifting mechanism and, in particular, to a light weight foldable lifting mechanism designed to aid an operator in lifting a load under a wide variety of settings and circumstances.
Generally, a patient lift (also variously referred to as a patient hoist, jack hoist or hydraulic lift) may be either a sling lift or a sit-to-stand lift. These devices generally allow caregivers in hospitals and nursing homes to transfer patients between various sitting and standing positions using hydraulic power.
Sling lifts are used for patients whose mobility is very limited. These are variously designed as mobile lifts or overhead lifts (suspended from ceiling-mounted or overhead tracks). Sit-to-stand lifts are designed to help patients who have some mobility but who lack the strength or muscle control to rise to a standing position. These lifts use a system of straps, vests, or belts (as opposed to slings) to make the transition possible.
Most current lift units are designed to be able to pick up a patient in a sling and then move them from one hospital room to another using the wheels on the bottom of the legs. These lifts are effective in a hospital or nursing home setting, but their large size and weight along with their use of wheels for rotation and motion make them fairly ineffective in a home setting with tight walkways and carpet. The inability to mobilize patients at home is one of the primary reasons that patients find it necessary to leave the home environment and enter a nursing home when they become temporarily or permanently disabled.
The lift of the present invention includes a lightweight, foldable lift that can be conveniently transported and stored in a home or car. According to a first preferred embodiment, the lift of the present invention may be operated as a caregiver lift to allow a typical caregiver to handle a patient under a wider variety of conditions and circumstances than the industrial sized lifts of the prior art. Further, the lift of the present invention is designed to allow a patient to be moved in all directions and to operate on a variety of surfaces.
The features and advantages of the present invention will be more clearly understood from the following description taken in conjunction with the accompanying drawings.
Like reference numerals refer to like parts throughout the description of several views of the drawings.
For the purposes of promoting an understanding of the principles of the present invention, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the present invention is hereby intended and such alterations and further modifications in the illustrated devices are contemplated as would normally occur to one skilled in the art. For instance, in many embodiments the present invention is discussed and referred to as a patient lift. However, it should be understood that the present invention may be used as a general lifting mechanism which can lift any of a variety items and/or people in a variety of circumstances.
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Preferably, the manual crank or lever 255 may be geared such that it can be turned easily. According to preferred embodiment, the lifting mechanism 250 preferably includes a locking mechanism so that the arm is kept stationary while the patient is suspended and the crank 255 is unattended. While in an unlocked position, the arm 259 may preferably rotate 360 degrees while supporting a harness. Preferably, the crank 255 will hold its own position with or without a lock and regardless of the arm position of the lifting mechanism 250. As discussed in more detail below, the lifting mechanism 250 may alternatively include a hydraulic lifting mechanism in place of the manual crank. Still further, the locking mechanism may be a hydraulic locking mechanism or a locking switch within the hydraulic lifting mechanism to keep the arm stationary.
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Due to the extreme forces exerted under normal operation, it is preferred that the pins and bolts of the present invention be made of high strength steel (>200 ksi) or similar material to keep from shearing when loaded. Additionally, because the base housing 300 of the present invention is subject to large amounts of stress, it is further preferred that it is made of high strength aluminum (>70 ksi yield) or a high quality grade of stainless steel.
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According to a preferred embodiment of the present invention, the materials used for the present invention may include unidirectional carbon fiber for all tubes, martinsitic stainless (or hard coated) steel for all pins, shafts and arm pivot bracket, and 7075 or stronger tempered aluminum for the base. Alternatively, any materials with suitable strength characteristics may be used.
While the above descriptions regarding the present invention contains much specificity, these should not be construed as limitations on the scope, but rather as examples. For example, several preferred dimensions and proportions for various aspects of the present invention are provided. However, it should be understood that each of the dimensions and proportions provided may be adjusted and/or changed based on the specific needs of a user. Further, the preferred embodiment of the present invention is shown having four legs. However, according to alternative preferred embodiments, the lift of the present invention may include alternative designs using any combination of three or more legs as needed. Still further, the present invention is discussed and disclosed with respect to the lifting of patients. However, it should be understood that the present invention may be used to lift or support any of a variety of items or individuals in a variety of settings without limitation. Further, the present invention may be modified and/or used in combination with any of a variety of attachments so that it may be customized for specific uses, such as for the lifting of a person into a tub or vehicle or over stairs.
The present invention claims priority to U.S. Provisional Application No. 62/059,589 filed Oct. 3, 2014.
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Number | Date | Country | |
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62059589 | Oct 2014 | US |