US20160309907A1 - Mattress Corner Lifting Device - Google Patents
Mattress Corner Lifting Device Download PDFInfo
- Publication number
- US20160309907A1 US20160309907A1 US15/094,046 US201615094046A US2016309907A1 US 20160309907 A1 US20160309907 A1 US 20160309907A1 US 201615094046 A US201615094046 A US 201615094046A US 2016309907 A1 US2016309907 A1 US 2016309907A1
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- US
- United States
- Prior art keywords
- mattress
- lifter
- force
- state
- compressed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C21/00—Attachments for beds, e.g. sheet holders, bed-cover holders; Ventilating, cooling or heating means in connection with bedsteads or mattresses
- A47C21/02—Holders for loose bed elements, e.g. sheet holders; bed cover holders
- A47C21/028—Holders for facilitating making the bed
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C21/00—Attachments for beds, e.g. sheet holders, bed-cover holders; Ventilating, cooling or heating means in connection with bedsteads or mattresses
- A47C21/02—Holders for loose bed elements, e.g. sheet holders; bed cover holders
- A47C21/026—Pillow holders; Mattress holders
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C21/00—Attachments for beds, e.g. sheet holders, bed-cover holders; Ventilating, cooling or heating means in connection with bedsteads or mattresses
- A47C21/06—Mattress underlays
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C31/00—Details or accessories for chairs, beds, or the like, not provided for in other groups of this subclass, e.g. upholstery fasteners, mattress protectors, stretching devices for mattress nets
Definitions
- the present invention may take the form of a method of lifting up and then pressing down, an end portion of a mattress that is generally supported on a supporting surface.
- the method utilizes a lifting device having an expanded position that is between 15 cm and 45 cm high, and a compressed position that is up to 6 cm high, and which in the expanded position resists compression sufficiently so that the weight of the mattress does not compress the device, but in the compressed position is urged toward its expanded position by a force small enough so that the weight of the mattress maintains the device in its compressed position and which is urged toward its expanded position by a force that is greater than the weight of the mattress, after the device has been released from the compressed position, but before reaching its extended position, the device being in its compressed state and underneath an end portion of the mattress, and being supported by the supporting surface, before subsequent steps of the method are performed.
- the mattress end portion is lifted up, thereby reducing the force exerted by the weight of the mattress to a level below the force urging the device toward its expanded position, and thereby permitting the device to expand into its expanded position, so that the device lifts the mattress end portion and supports it in an elevated position. Later, the mattress end portion is pushed down with sufficient force that together with force exerted by the weight of the mattress, the device is compressed into its compressed state.
- the present invention may take the form of a bed, having a base, having a rectangular top surface, defining two mattress-wide end portions, each including two interior corners of said base and a mattress having two mattress-wide end portions each including two interior corners of said mattress, supported by the rectangular top surface. Further, a mattress end portion lifter is supported by the base at an end portion, beneath a first mattress end portion.
- the lifter has a compressed state, in which the lifter exerts an upward force that is less than the weight of the mattress pushing down on the lifter and an intermediate, partially-extended state, in which the lifter exerts an upward force that is greater than the weight of the mattress pushing down on the lifter and further has an extended state, in which the lifter resists compression by a force great enough to resist being compressed by the downward force of the weight of the mattress. Accordingly, a user may release the lifter from its compressed state by lifting up on the first mattress end portion and may place the lifter into its compressed state by pushing down on the first mattress corner.
- the present invention may take the form of a mattress corner lifter that includes a base and a lifting mechanism supported by the base. Also, a platform is rotatably supported at the top of the lifting mechanism.
- the lifting has a compressed state, an extended state and an intermediate state between the compressed and extended states. In the compressed state the mattress lifter pushes up with a force of less than 25 lbs, but in its intermediate state the force with which the mattress lifter presses up increases as the mattress lifter extends, until it reaches a maximum of at least 40 lbs, and wherein at the extended state the mattress lifter resists compression with a force of at least 40 lbs.
- FIG. 1 shows a top-side-front isometric view of a mattress lifting device according to the present invention.
- FIG. 2 is a perspective view of the device of FIG. 1 in its compressed state, underneath a mattress corner.
- FIG. 3 is a perspective view of the device of FIG. 1 in its extended state, underneath a mattress corner.
- a lifting device 10 is comprised of a base platform 12 , which is joined to a top platform 14 through a series of eight interconnected bars, comprising two parallel sets of four interconnected bars.
- first set the first end of a first bar 16 is joined to a base platform 12 through a first hinge point 18 A mounted on intermediate element 20 .
- a second hinge point 22 is located at the midpoint of a first bar 16 , and joins said first bar 16 with a second bar 36 , such that the bars may appear to intersect one another at a variety of angles, depending on the expansion or compression of the lifting device 10 .
- the second end of a first bar 16 is hinged to the first end of a third bar 24 at a hinge point 26 ; likewise, the second end of a second bar 36 is hinged to the first end of a fourth bar 28 at a hinge point 32 .
- the second ends of a third bar 24 and a fourth bar 28 are then hinged together at a hinge point 30 .
- the top platform 14 is rotatably attached to a hinge point 30 by a second intermediate element 34 .
- the first end of a fifth bar 38 is joined to a base platform 12 through a first hinge point 18 B mounted on intermediate element 20 .
- a second hinge point 40 is located at the midpoint of the fifth bar 38 , and joins said fifth bar 38 with a sixth bar 42 , such that the bars may appear to intersect one another at a variety of angles, depending on the expansion or compression of the lifting device 10 .
- the second end of a fifth bar 38 is hinged to the first end of a seventh bar 48 at a hinge point 52 ; likewise, the second end of a sixth bar 42 is hinged to the first end of an eighth bar 46 at a hinge point 44 .
- the second ends of the seventh bar 48 and an eighth bar 46 are then hinged together at a hinge point 50 .
- the platform 14 in addition to being hinged at point 30 , as noted above, is rotatably attached to hinge point 50 .
- bars 24 , 28 , 46 , and 48 are of identical proportions, and bars 16 , 36 , 38 , and 42 are also of identical proportions, such that device 10 may expand between 15 and 45 centimeters, and compress to 6 centimeters.
- Cross-members 54 join the hinge points 32 and 44 , 26 and 52 , and 30 and 50 , thus allowing the lifting device 10 to expand and compress.
- a spring 56 is fastened to a cross-member 54 between hinge points 32 and 44 and a second cross-member 54 between hinge points 26 and 52 , and tensions the device 10 .
- the first ends of bars 36 and 42 may feature wheels 58 as shown in FIG.
- the lifting device 10 may include only one set of four interconnected bars. In one embodiment one or more of the bars might have a forked end or forded ends, for greater transverse stability.
- the platform 14 may be attached to at a single one of hinge point 34 or 50 with a ball and socket joint, permitting a greater range of pivoting motion, thus permitting the device 10 to adapt to a greater range of mattress configurations.
- the expansion of the spring 56 is positively related to the degree of compression of the device 10 .
- This relationship may be explained mathematically using Equation 1, where k is the stiffness constant of the spring 56 , ⁇ is the angle formed between the bar 24 and spring 56 , F is the upward force exerted by superior platform 14 (or the force resisting compression, when device 10 is in its extended state), L S is the length of the compressed spring 56 , and L B is the length of any one of bars 24 , 28 , 46 or 48 and F I is the initial resistance against extension of spring 56 .
- the lifting device 10 may lift up an end portion, which could more specifically by a corner, of a mattress that is generally supported on a supporting surface. After the end portion has been lifted, for example to change a fitted sheet, it may be returned to its initial resting position by pressing down upon it, so that the downward force exerted by a user, plus the mattress weight returns device 10 to its compressed position, as shown in FIG. 2 .
- the term “end portion” may refer to a mattress-wide end portion or to a mattress corner.
- the lifting device 10 may be an integral component of a bed, which may be manufactured such that there is one at each mattress-wide end portion (two in all) or one for each corner (four in all) beneath the mattress.
- Lifting devices 10 may be added to an existing bed beneath the mattress.
- Lifting devices 10 adapted to be added to an existing bed, may have some engagement features on the bottom of base platform 12 or at the top of top platform 14 , or both, to engage the surface upon which device 10 rests, and/or engage the mattress 60 .
- Such engagement features could include adhesives, short spikes or a “grippy” rubberized material.
- device 10 could be affirmatively fastened to the surface upon which it rests.
- FIG. 2 shows the device in its compressed state as a result of these overwhelming downward forces, where it will stay from the mattress weight, as the upward force in the compressed position is much smaller than the upward force in the expanded or intermediate position.
- top platform 14 measures 18 cm ⁇ 13 cm (7′′ ⁇ 5′′) and the base platform measures 25 cm ⁇ 13 cm (10′′ ⁇ 5′′).
- the device expands from a compressed height of 3.8 cm (1.5′′) to an expanded height of 28 cm (11′′).
- Device 10 may be made of steel.
- the bars 24 , 28 , 46 , and 48 and bars 16 , 36 , 38 , and 42 may be made of wood, as well as can be platforms 12 and 14 . In general, any material having the requisite strength may be used.
- spring 56 is a metal coil spring, but in another it is made of elastomeric material.
- bars 24 , 28 , 46 and 48 are made of polymeric material, formed into lengths having an “I” cross-section, or a cross section having two exterior ridges and a central ridge, for additional strength.
- bars 24 , 28 , 46 and 48 are made of acrylonitrile butadiene styrene (ABS) polymer.
Landscapes
- Mattresses And Other Support Structures For Chairs And Beds (AREA)
Abstract
A mattress corner lifter that includes a base and a lifting mechanism supported by the base. Also, a platform is rotatably supported at the top of the lifting mechanism. The lifting has a compressed state, an extended state and an intermediate state between the compressed and extended states. In the compressed state the mattress lifter pushes up with a force of less than 25 lbs, but in its intermediate state the force with which the mattress lifter presses up increases as the mattress lifter extends, until it reaches a maximum of at least 40 lbs, and wherein at the extended state the mattress lifter resists compression with a force of at least 40 lbs.
Description
- This application is a continuation-in-part of application Ser. No. 14/799,452, filed on Jul. 14, 2015, now U.S. Pat. No. 9,320,362, issued Apr. 26, 2016, which in turn is a continuation of application Ser. No. 14/696,894, filed Apr. 27, 2015, now U.S. Pat. No. 9,241,577, issued Jan. 26, 2016, which are incorporated herein by reference as if fully set forth herein.
- Those tasked with changing sheets on a bed typically must lift up the corner of a mattress to take out the old fitted sheet and replace it with a new one. This can be difficult, particularly for people who are old or infirm or both. Although some devices have been introduced to ease this task, none has truly filled the human need.
- The following embodiments and aspects thereof are described and illustrated in conjunction with systems, tools and methods which are meant to be exemplary and illustrative, not limiting in scope. In various embodiments, one or more of the above-described problems have been reduced or eliminated, while other embodiments are directed to other improvements.
- In a first separate aspect, the present invention may take the form of a method of lifting up and then pressing down, an end portion of a mattress that is generally supported on a supporting surface. The method utilizes a lifting device having an expanded position that is between 15 cm and 45 cm high, and a compressed position that is up to 6 cm high, and which in the expanded position resists compression sufficiently so that the weight of the mattress does not compress the device, but in the compressed position is urged toward its expanded position by a force small enough so that the weight of the mattress maintains the device in its compressed position and which is urged toward its expanded position by a force that is greater than the weight of the mattress, after the device has been released from the compressed position, but before reaching its extended position, the device being in its compressed state and underneath an end portion of the mattress, and being supported by the supporting surface, before subsequent steps of the method are performed. The mattress end portion is lifted up, thereby reducing the force exerted by the weight of the mattress to a level below the force urging the device toward its expanded position, and thereby permitting the device to expand into its expanded position, so that the device lifts the mattress end portion and supports it in an elevated position. Later, the mattress end portion is pushed down with sufficient force that together with force exerted by the weight of the mattress, the device is compressed into its compressed state.
- In a second separate aspect, the present invention may take the form of a bed, having a base, having a rectangular top surface, defining two mattress-wide end portions, each including two interior corners of said base and a mattress having two mattress-wide end portions each including two interior corners of said mattress, supported by the rectangular top surface. Further, a mattress end portion lifter is supported by the base at an end portion, beneath a first mattress end portion. The lifter has a compressed state, in which the lifter exerts an upward force that is less than the weight of the mattress pushing down on the lifter and an intermediate, partially-extended state, in which the lifter exerts an upward force that is greater than the weight of the mattress pushing down on the lifter and further has an extended state, in which the lifter resists compression by a force great enough to resist being compressed by the downward force of the weight of the mattress. Accordingly, a user may release the lifter from its compressed state by lifting up on the first mattress end portion and may place the lifter into its compressed state by pushing down on the first mattress corner.
- In a third separate aspect, the present invention may take the form of a mattress corner lifter that includes a base and a lifting mechanism supported by the base. Also, a platform is rotatably supported at the top of the lifting mechanism. The lifting has a compressed state, an extended state and an intermediate state between the compressed and extended states. In the compressed state the mattress lifter pushes up with a force of less than 25 lbs, but in its intermediate state the force with which the mattress lifter presses up increases as the mattress lifter extends, until it reaches a maximum of at least 40 lbs, and wherein at the extended state the mattress lifter resists compression with a force of at least 40 lbs.
- In addition to the exemplary aspects and embodiments described above, further aspects and embodiments will become apparent by reference to the drawings and by study of the following detailed descriptions.
- Exemplary embodiments are illustrated in referenced drawings. It is intended that the embodiments and figures disclosed herein are to be considered illustrative rather than restrictive.
-
FIG. 1 shows a top-side-front isometric view of a mattress lifting device according to the present invention. -
FIG. 2 is a perspective view of the device ofFIG. 1 in its compressed state, underneath a mattress corner. -
FIG. 3 is a perspective view of the device ofFIG. 1 in its extended state, underneath a mattress corner. - In a preferred embodiment of the invention, as shown in
FIG. 1 , alifting device 10 is comprised of abase platform 12, which is joined to atop platform 14 through a series of eight interconnected bars, comprising two parallel sets of four interconnected bars. In the first set, the first end of afirst bar 16 is joined to abase platform 12 through afirst hinge point 18A mounted onintermediate element 20. Asecond hinge point 22 is located at the midpoint of afirst bar 16, and joins saidfirst bar 16 with asecond bar 36, such that the bars may appear to intersect one another at a variety of angles, depending on the expansion or compression of thelifting device 10. The second end of afirst bar 16 is hinged to the first end of athird bar 24 at ahinge point 26; likewise, the second end of asecond bar 36 is hinged to the first end of afourth bar 28 at ahinge point 32. The second ends of athird bar 24 and afourth bar 28 are then hinged together at ahinge point 30. Thetop platform 14 is rotatably attached to ahinge point 30 by a secondintermediate element 34. - In the second set of four interconnected bars, the first end of a
fifth bar 38 is joined to abase platform 12 through afirst hinge point 18B mounted onintermediate element 20. Asecond hinge point 40 is located at the midpoint of thefifth bar 38, and joins saidfifth bar 38 with asixth bar 42, such that the bars may appear to intersect one another at a variety of angles, depending on the expansion or compression of thelifting device 10. The second end of afifth bar 38 is hinged to the first end of aseventh bar 48 at ahinge point 52; likewise, the second end of asixth bar 42 is hinged to the first end of aneighth bar 46 at ahinge point 44. The second ends of theseventh bar 48 and aneighth bar 46 are then hinged together at ahinge point 50. Theplatform 14, in addition to being hinged atpoint 30, as noted above, is rotatably attached tohinge point 50. - Notably,
bars bars device 10 may expand between 15 and 45 centimeters, and compress to 6 centimeters. Cross-members 54 join thehinge points lifting device 10 to expand and compress. Aspring 56 is fastened to across-member 54 betweenhinge points second cross-member 54 betweenhinge points device 10. The first ends ofbars wheels 58 as shown inFIG. 1 , or, alternatively, smooth, blunt ends (not shown) that can slide onbase platform 12, allowing a user to expand or compress thedevice 10 more easily. In another preferred embodiment, thelifting device 10 may include only one set of four interconnected bars. In one embodiment one or more of the bars might have a forked end or forded ends, for greater transverse stability. In another embodiment, theplatform 14 may be attached to at a single one ofhinge point device 10 to adapt to a greater range of mattress configurations. - In this embodiment, the expansion of the
spring 56 is positively related to the degree of compression of thedevice 10. This relationship may be explained mathematically using Equation 1, where k is the stiffness constant of thespring 56, θ is the angle formed between thebar 24 andspring 56, F is the upward force exerted by superior platform 14 (or the force resisting compression, whendevice 10 is in its extended state), LS is the length of thecompressed spring 56, and LB is the length of any one ofbars spring 56. -
(F I+2k(L B Cos θ−0.5 LS)(sin θ)=F Equation 1 - Skilled persons will recognize that the upward force F will initially grow as θ is reduced and the
spring 56 is stretched, exerting a greater force. But a maximum is reached when the value of sin θ, which decreases with decreasing θ, begins to decrease faster than the spring force is increasing. Put into familiar physical terms, the spring is exerting more force, but a smaller proportion of that force is directed upwardly, as an upward force. - The
lifting device 10 may lift up an end portion, which could more specifically by a corner, of a mattress that is generally supported on a supporting surface. After the end portion has been lifted, for example to change a fitted sheet, it may be returned to its initial resting position by pressing down upon it, so that the downward force exerted by a user, plus the mattress weight returnsdevice 10 to its compressed position, as shown inFIG. 2 . As used in this application, the term “end portion” may refer to a mattress-wide end portion or to a mattress corner. Thelifting device 10 may be an integral component of a bed, which may be manufactured such that there is one at each mattress-wide end portion (two in all) or one for each corner (four in all) beneath the mattress. Alternatively a set oflifting devices 10 may be added to an existing bed beneath the mattress.Lifting devices 10, adapted to be added to an existing bed, may have some engagement features on the bottom ofbase platform 12 or at the top oftop platform 14, or both, to engage the surface upon whichdevice 10 rests, and/or engage themattress 60. Such engagement features could include adhesives, short spikes or a “grippy” rubberized material. Alternatively,device 10 could be affirmatively fastened to the surface upon which it rests. - When a user lifts up on a
mattress end portion 60, the downward force exerted by the weight of the mattress is reduced to a level below that of the upward force F exerted by theplatform 14. Consequently, thedevice 10 begins to expand vertically with increasing force for at least a first portion of its expansion, until it reaches its extended state. However, when the user presses down on themattress end portion 60, the combined downward forces from the user-applied pressure and the weight of the mattress surpass the upward force, thereby urging the device towards its compressed position, causing thespring 56 to expand and thedevice 10 to compress.FIG. 2 shows the device in its compressed state as a result of these overwhelming downward forces, where it will stay from the mattress weight, as the upward force in the compressed position is much smaller than the upward force in the expanded or intermediate position. - In one preferred embodiment, 62 lbs of force is required to begin to compress
device 10, and after achieving its compressed position, 20 lbs of force is required to keep it in that position. Further, in this embodimenttop platform 14 measures 18 cm×13 cm (7″×5″) and the base platform measures 25 cm×13 cm (10″×5″). Finally, in a preferred embodiment the device expands from a compressed height of 3.8 cm (1.5″) to an expanded height of 28 cm (11″).Device 10 may be made of steel. Alternatively, thebars platforms preferred embodiment spring 56 is a metal coil spring, but in another it is made of elastomeric material. In one embodiment bars 24, 28, 46 and 48 are made of polymeric material, formed into lengths having an “I” cross-section, or a cross section having two exterior ridges and a central ridge, for additional strength. In a preferred embodiment bars 24, 28, 46 and 48 are made of acrylonitrile butadiene styrene (ABS) polymer. - While a number of exemplary aspects and embodiments have been discussed above, those possessed of skill in the art will recognize certain modifications, permutations, additions and sub-combinations thereof. It is therefore intended that the following appended claims and claims hereafter introduced are interpreted to include all such modifications, permutations, additions and sub-combinations as are within their true spirit and scope.
Claims (4)
1. A mattress corner lifter, comprising:
a) a base,
b) a lifting mechanism supported by said base; and
c) a platform rotatably supported at said top of said lifting mechanism;
d) wherein said lifting has a compressed state, an extended state and an intermediate state between said compressed and extended states and wherein in said compressed state said mattress lifter pushes up with a force of less than 25 lbs, but in its intermediate state the force with which said mattress lifter presses up increases as said mattress lifter extends, until it reaches a maximum of at least 40 lbs, and wherein at said extended state said mattress lifter resists compression with a force of at least 40 lbs.
2. The mattress corner lifter of claim 1 , wherein said platform is rotatably mounted in one rotational dimension, only.
3. The mattress corner lifter of claim 1 , wherein said platform is rotatably mounted in more than one rotational dimension.
4. The mattress corner lifter of claim 1 , wherein said platform is made of acrylonitrile butadiene styrene (ABS) polymer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US15/094,046 US20160309907A1 (en) | 2015-04-27 | 2016-04-08 | Mattress Corner Lifting Device |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/696,894 US9241577B1 (en) | 2015-04-27 | 2015-04-27 | Mattress corner lifting device |
US14/799,452 US9320362B1 (en) | 2015-04-27 | 2015-07-14 | Mattress corner lifting device |
US15/094,046 US20160309907A1 (en) | 2015-04-27 | 2016-04-08 | Mattress Corner Lifting Device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/799,452 Continuation-In-Part US9320362B1 (en) | 2015-04-27 | 2015-07-14 | Mattress corner lifting device |
Publications (1)
Publication Number | Publication Date |
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US20160309907A1 true US20160309907A1 (en) | 2016-10-27 |
Family
ID=57147059
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US15/094,046 Abandoned US20160309907A1 (en) | 2015-04-27 | 2016-04-08 | Mattress Corner Lifting Device |
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US (1) | US20160309907A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20230059520A1 (en) * | 2021-08-17 | 2023-02-23 | Michael Scott | Bed And Frame Assembly |
USD1008012S1 (en) * | 2023-09-18 | 2023-12-19 | Jingbei Chen | Mattress lifter |
-
2016
- 2016-04-08 US US15/094,046 patent/US20160309907A1/en not_active Abandoned
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20230059520A1 (en) * | 2021-08-17 | 2023-02-23 | Michael Scott | Bed And Frame Assembly |
US11937699B2 (en) * | 2021-08-17 | 2024-03-26 | Michael Scott | Bed and frame assembly |
USD1008012S1 (en) * | 2023-09-18 | 2023-12-19 | Jingbei Chen | Mattress lifter |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |