Patent Application
20180125262
The present invention relates generally to an infant care apparatus and, more particularly, to a seat for an infant or baby that can be moved by a drive mechanism.
Baby swings and bouncy seats have been used to hold, comfort, and entertain infants and babies for many years. Prior art bouncy seats are normally constructed with a wire frame that contains some resistance to deformation that is less than or equal to the weight of the child in the seat. Thus, when the child is placed in the seat, his or her weight causes a slight and temporary deformation in the wire structure that is then counteracted by the wire frame's resistance to deformation. The end result is that the child moves up and down slightly relative to the floor. This motion can be imparted to the seat by a caregiver for the purpose of entertaining or soothing the child.
Baby swings normally function in much the same way as swing sets for older children; however, the baby swing usually has an automated power-assist mechanism that gives the swing a “push” to continue the swinging motion in much the same way a parent will push an older child on a swing set to keep them swinging at a certain height from the ground.
There are some products that have recently entered the market that defy easy inclusion into either the bouncy or swing category. One such product includes a motorized motion that can move the infant laterally, but only has a single degree of motorized freedom and is thus limited in the motion profiles that can be generated. While the seat can be rotated so that the baby is moved back and forth in a different orientation, there remains only one possible motion profile.
A need exists for a motorized infant chair that is capable of simultaneous or independent movement in two dimensions, and can reproduce a large number of motion profiles with those two dimensions to both better mimic the motion of a parent or caregiver.
Described herein is a motorized infant chair that is capable of simultaneous or independent movement in at least two dimensions, and can reproduce a large number of motion profiles with those at least two dimensions to better mimic the motion of a parent or caregiver.
Accordingly, in one embodiment, an infant care apparatus includes a base; a drive mechanism coupled to the base; a controller electronically coupled to the drive mechanism; and a support device coupled to the drive mechanism. The support device is configured to be moved in both a horizontal and vertical direction relative to the base by the drive mechanism. The drive mechanism is controlled by the controller to move the support device in a plurality of motion profiles relative to the base.
The controller may be mounted within the base, and may include a user interface configured to receive input from the user for controlling the movement of the drive mechanism. Each of the plurality of motion profiles may include both horizontal and vertical movements.
The drive mechanism may include a horizontal reciprocating assembly and a vertical reciprocating assembly disposed on the horizontal reciprocating assembly. The horizontal reciprocating assembly may include a first motor having a drive shaft; a slide crank assembly comprising a gearing assembly coupled to the drive shaft of the first motor and a crank member coupled to the gearing assembly; and a sliding stage coupled to the crank member. Operation of the first motor may cause rotation of the slide crank assembly, thereby imparting reciprocating horizontal motion to the sliding stage. The vertical reciprocating assembly includes a second motor having a drive shaft; a worm gear assembly coupled to the output of the drive shaft; and a vertical yoke having a first end coupled to an output shaft of the worm gear assembly. Operation of the second motor may cause rotation of the vertical yoke, thereby imparting reciprocating vertical motion to the support device. The vertical reciprocating assembly may further include a dual scissor mechanism coupled to a second end of the vertical yoke configured to support the support device.
Accordingly, the first motor provides horizontal motion to the support device and the second motor provides vertical motion to the support device. A first encoder having a single slot may be coupled to a drive shaft of the first motor and a second encoder having a single slot may be coupled to the drive shaft of the second motor. The controller may determine position information of the support device based at least in part on information from the first encoder and the second encoder. The control system may also include two positional sensors to indicate when the vertical reciprocating assembly is in its lowest position and when the horizontal reciprocating assembly is at its furthest point to the right when viewed from the front.
The support device may include a seat support tube coupled to the drive mechanism; a substantially elliptical seating portion coupled to a first end and a second end of the seat support tube; and a toy bar having a first end coupled to the second end of the seat support tube and a second end extending over the seating portion. The position of the seating portion of the support device may be adjusted by sliding the seat support tube within the drive mechanism and locking the seat support tube in a desired position. The first end of the toy bar may include a curved surface that corresponds to a curved surface of the second end of the seat support tube, thereby causing the second end of the toy bar to be centered over the seating portion when the first end of the toy bar is coupled to the second end of the seat support tube.
Further disclosed is a method of controlling an infant care apparatus. The method may include the steps of providing an infant care apparatus having a base, a drive mechanism coupled to the base, a controller electronically coupled to the drive mechanism, and a support device coupled to the drive mechanism; providing a first encoder coupled to a drive shaft of a first motor of the drive mechanism; and providing a second encoder coupled to a drive shaft of a second motor of the drive mechanism. The first motor is configured to provide horizontal movement to the drive mechanism, and the second motor is configured to provide vertical movement to the drive mechanism. The method also includes the steps of transmitting positional information from the first and second encoders to the controller; determining the position of the drive mechanism based on the positional information; and moving the support device in at least one motion profile relative to the base.
The first encoder and the second encoder may each include no more than one slot. Each of the plurality of motion profiles may include movement of the support device in a horizontal directional and a vertical direction relative to the base. The movement of the support device in the horizontal direction and the movement of the support device in the vertical direction may be coordinated such that a repeatable, visually distinctive motion profile is obtained.
The support device may be moved relative to the base in a plurality of motion profiles. Each of the plurality of motion profiles may be predetermined and one of the plurality of motion profiles is selected by a user. A speed of the first motor and the second motor may be adjustable by the controller.
Also disclosed is an infant care apparatus that includes a drive mechanism and a support device coupled to the drive mechanism. The drive mechanism is configured to move the support device in a plurality of motion profiles each comprising both vertical and horizontal movement of the support device.
Further disclosed is an infant care apparatus that includes a base; a drive mechanism coupled to the base; a controller electronically coupled to the drive mechanism; and a support device coupled to the drive mechanism. The support device is configured to be moved in both a horizontal and vertical direction relative to the base by the drive mechanism. The movements of the support device in the horizontal and vertical directions are independently controlled by the controller.
Movements of the support device in the horizontal and vertical directions may be coordinated to obtain at least one motion profile. The support device may be moved in the vertical direction a maximum of about 1.5 inches and the support device may be moved in the horizontal direction a maximum of about 3.0 inches. Movement in the vertical direction may have a frequency range of between about 10 and 40 cycles per minute and movement in the horizontal direction may have a frequency range of between about 10 and 40 cycles per minute.
These and other features and characteristics of the present invention, as well as the methods of operation and functions of the related elements of structures and the combination of parts and economies of manufacture, will become more apparent upon consideration of the following description and the appended claims with reference to the accompanying drawings, all of which form a part of this specification, wherein like reference numerals designate corresponding parts in the various figures. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only and are not intended as a definition of the limits of the invention. As used in the specification and the claims, the singular form of “a”, “an”, and “the” include plural referents unless the context clearly dictates otherwise.
For purposes of the description hereinafter, the terms “upper”, “lower”, “right”, “left”, “vertical”, “horizontal”, “top”, “bottom”, “lateral”, “longitudinal”, and derivatives thereof shall relate to the invention as it is oriented in the drawing figures. However, it is to be understood that the invention may assume alternative variations and step sequences, except where expressly specified to the contrary. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification, are simply exemplary embodiments of the invention. Hence, specific dimensions and other physical characteristics related to the embodiments disclosed herein are not to be considered as limiting.
An infant care apparatus according to one embodiment is shown in
With reference to
Seating portion 9 is designed to receive a fabric or other type of comfortable seat 17 for an infant as shown in phantom in
Seat support tube 11 is connected to upper end 13 of seating portion 9 via an upper connector 23 and curvedly extends away from the upper connector 23 toward lower end 15 of seating portion 9 where it is coupled to a lower connector 25. With reference to
In operation, a user pushes up on camming mechanism 37 and slides seat support tube 11 within curved passage 27 until a desired position for seating portion 9 is reached. The user then pushes down on camming mechanism 37 causing rear recline locker 31 to move forward and forward recline locker 33 to move back. This has the effect of sandwiching seat support tube 11 between an upper surface of curved passage 27 and locking pads 35 of rear recline locker 31 and forward recline locker 33. This allows the orientation of seating portion 9 to be easily altered for the comfort of the infant or baby seated therein. A seat recline security switch 40 (see
In addition, a toy bar 41 is also provided as shown in
Base 3 includes a bottom support housing 50 with a top enclosure 52 positioned over and covering bottom support housing 50. The drive mechanism is supported on bottom support housing 50 and extends from an opening 54 in top enclosure 52. Base 3 houses control panel 53 coupled to a controller for viewing and controlling the speed and motion of the drive mechanism as will be described in greater detail hereinafter. Base 3 may further include a portable music player dock 55, with speakers 57 and an input jack 58, for playing music or other pre-recorded soothing sounds. Control panel 53 may also have display 56 to provide information to the user as to motion profile, volume of music being played through speakers 57, and speed of the reciprocation motion, for example.
With reference to
Horizontal reciprocating assembly 61 includes a rigid platform 65. Rigid platform 65 is generally I-shaped having top and bottom sides 67 and 69, respectively, and left and right sides 71 and 73, respectively. Top side 67 of rigid platform 65 includes at least one grooved wheel 75, and preferably two grooved wheels 75, similar in function and appearance to a pulley wheel, suitably disposed thereon such that top side 67 of rigid platform 65 is rollingly supported by grooved wheels 75. A rail 77 is fixably attached to bottom support housing 50 of base 3. Rail 77 rollingly receives grooved wheels 75 on top side 67 of rigid platform 65. Bottom side 69 of rigid platform 65 includes at least one wheel 76, and preferably two wheels 76, suitably disposed thereon such that bottom side 69 of rigid platform 65 is rollingly supported by wheels 76. A slot 78 is provided to rollingly receive wheels 76 on bottom side 69 of rigid platform 65. Top side 67 is provided with grooved wheels 75 positioned on a rail 77 while bottom side 69 is provided with wheels 76 positioned within a slot 78 to account for any manufacturing error in rigid platform 65. If rigid platform 65 is too long or short, wheels 76 will “float” a slight amount within slot 78 to account for this manufacturing error. Thus, in a preferred embodiment, horizontal reciprocating assembly 61 is capable of rolling back and forth along rail 77 and slot 78, thereby allowing a horizontal displacement of the horizontal reciprocating assembly 61 of approximately three inches.
Horizontal reciprocating assembly 61 further includes a first motor 79 having a drive shaft 81 mounted to bottom support housing 50 and a slide crank assembly, denoted generally as reference numeral 83, also mounted to bottom support housing 50. Slide crank assembly 83 includes a gearing assembly having a set of first gears 85 operationally coupled to drive shaft 81 of first motor 79 and a large second gear 87 operationally coupled to first gears 85. Slide crank assembly 83 further includes a crank member 89 having a first end 91 and a second end 93. First end 91 of crank member 89 is rotationally coupled to a point on the outer circumference of second gear 87, and second end 93 of crank member 89 is fixedly coupled to a point approximately in the center of left side 71 of rigid platform 65. In operation, actuation of first motor 79 causes rotation of first gears 85 which in turn causes rotation of second gear 87. The rotation of second gear 87 causes crank member 89 to either push or pull rigid platform 65 depending on the position of crank member 89. This operation effects a reciprocating horizontal movement of rigid platform 65, along with everything mounted thereon, back and forth along rails 77. Accordingly, this system allows a single motor (i.e., first motor 79) to move rigid platform 65 back and forth with the motor only running in a single direction, thereby eliminating backlash in the system. The system for controlling horizontal reciprocating assembly 61 to achieve the desired motion profile will be discussed in greater detail hereinafter.
With reference to
First double scissor mechanism 95 includes a first pair of spaced-apart parallel members 101, 101′ and a second pair of spaced-apart parallel members 103, 103′. Second double scissor mechanism 97 includes a third pair of spaced-apart parallel members 105, 105′ and a fourth pair of spaced-apart parallel members 107, 107′.
Lower ends 101L of the first pair of spaced-apart parallel members 101, 101′ and lower ends 107L of the fourth pair of spaced-apart parallel members 107, 107′ are rotatably pinned to each other and to rigid platform 65. Likewise, upper ends 103U, 103U′ of second pair of spaced-apart parallel members 103, 103′, and upper ends 105U, 105U′ of third pair of spaced-apart parallel members 105, 105′ are rotatably pinned to each other and to the supporting platform 99.
First and second horizontal bars 109, 111 are provided and extend transversely between lower ends of second pair of spaced-apart parallel members 103, 103′, and between lower ends of third pair of spaced-apart parallel members 105, 105′, respectively, for additional structural stability. In addition, first and second horizontal bars 109, 111 may further include bearing wheels 113 at their ends for supporting vertical reciprocating assembly 63 and supporting platform 99 and allowing smooth translational movement of first and second horizontal bars 109, 111 during operation.
Still further, third and fourth horizontal bars 115, 117 extend transversely between the upper ends 101U, 101U′ of the first pair of spaced-apart parallel members 101, 101′, and the upper ends 107U, 107U′ of the fourth pair of spaced-apart parallel members 107, 107′, respectively. Third and fourth horizontal bars 115, 117 include bearing wheels 119 at their ends for supporting support platform 99.
First pair of spaced-apart parallel members 101, 101′ is pivotally secured at a central portion thereof to second pair of spaced-apart parallel members 103, 103′ via horizontal pivot pins, or the like. Correspondingly, third pair of spaced-apart parallel members 105, 105′ is also pivotally secured at their respective central portions to fourth pair of spaced-apart parallel members 107, 107′ via horizontal pivot pins, or the like.
As a consequence of the foregoing description of the double scissor mechanism, when supporting platform 99, which is designed to support seating portion 9, is displaced in a vertically upward direction, both front and rear supporting and non-supporting members move in crossed fashion relative to the pivot pins such that the double scissor mechanism extends between rigid platform 65 and the upwardly displaced supporting platform 99 as illustrated by the successively increased supporting platform 99 height in
Additionally, vertical reciprocating assembly 63 may be provided with at least one, and preferably two, resistive mechanical elements 123, such as a tension spring, fixably attached between lower ends 103L of second pair of spaced-apart parallel members 103, 103′ and the lower ends 105L of third pair of spaced-apart parallel members 105, 105′ whereby the upward vertical motion of vertical reciprocating assembly 63 is assisted by resistive mechanical element 123 because it pulls the relevant portions of the double scissor mechanism toward each other. The position of restrictive mechanical element 123 described above is not to be construed as limiting as the exact location of the attachment of resistive mechanical element 123 to the double scissor mechanism can be varied with similar results so long as it is attached to portions that get closer together as supporting platform 99 rises away from base 3 and it is attached in a way that assists that movement. Resistive mechanical element 123 also has the benefit of counteracting the effects of gravity because it acts to reduce downward movement when properly placed.
In yet another aspect, the resistive mechanical element 123 comprises a compression spring (not shown) placed in an advantageous position relative to vertical reciprocating assembly 63, such as between rigid platform 65 and supporting platform 99 in order to assist vertical expansion of the double scissor mechanism and resist vertical contraction of the double scissor mechanism.
With continued reference to
With reference to
The control system of infant care apparatus 1 includes a controller, such as a microprocessor, a rheostat, a potentiometer, or any other suitable control mechanism, one or a plurality of control switches or knobs 141 for causing actuation of drive mechanism 59, and a variety of inputs and outputs operatively coupled to the controller. Since horizontal reciprocating assembly 61 and vertical reciprocating assembly 63 each include its own motor 79 and 125, respectively, horizontal reciprocating assembly 61 can be controlled independently of vertical reciprocating assembly 63 to obtain a variety of motion profiles that include both horizontal and vertical motion.
The control system desirably includes a variety of input sensors. For example, the control system may include a horizontal encoder 143 coupled to a back shaft 145 of first motor 79. Horizontal encoder 143 may include an infrared (IR) sensor 147 and a disk 149 with single hole or slot 151 positioned thereon (see
Horizontal and vertical limit switches 165, 167 may also be provided to provide inputs to the controller that rigid platform 65 has passed over an end of travel and that supporting platform 99 has passed over an end of travel, respectively. In addition, vertical limit switch 167 indicates when vertical reciprocating assembly 63 is in its lowest position and horizontal limit switch 165 indicates when horizontal reciprocating assembly 61 is at its furthest point to the right when viewed from the front. Horizontal and vertical limit switches 165, 167 allow the control system to quickly determine the initial position of the horizontal reciprocating assembly 61 and the vertical reciprocating assembly 63 and to adjust for error in drive mechanism 59 as discussed in greater detail hereinafter. These limit switches 165, 167 may be embodied as optical switches.
An overcurrent protection circuit detection input (not shown) may also be provided to the controller in order to prevent the electronics from being damaged. For instance, if too much current is drawn, circuitry may be provided that diverts power from second motor 125 if current exceeds a threshold. Additional circuitry detects whether this protection circuit has been tripped. Finally, control switches 141 may include user input buttons such as a main power button, a start/stop button, a motion increment button, a motion decrement button, a speed increment button, a speed decrement button, and the like.
The controller of the control system may also include a variety of outputs. These outputs include, but are not limited to: (1) Pulse Width Modulation (PWM) for first motor 79, (2) PWM for second motor 125, (3) display 56 backlight, which can be turned on and off independently in order to conserve power, (4) display 56 segments, and (5) power to IR lights of IR sensors 147, 157 of encoders 143, 153, which can be turned on and off to conserve power when infant care apparatus 1 is not in use.
The following explanation provides an understanding of an exemplary control system of infant care apparatus 1. Based on the physical limitations of first and second motors 79, 125 of horizontal and vertical reciprocating assemblies 61, 63, the maximum speed of first motor 79 may be about a four second period and the maximum speed of second motor 125 may be about a two second period. Based on these constraints, the following relationships may be established:
The speed of first motor 79 is independently set to a correct period and a feedback control loop is used to ensure that first motor 79 remains at a constant speed despite the dynamics of the components of infant care apparatus 1. As mentioned above, the output of the control system is a PWM signal for first motor 79. One possible input for the control system is velocity of first motor 79, which can be observed from the speed of first motor 79 as observed by horizontal encoder 143. However, in order to avoid computationally expensive calculations, it is possible to operate in the frequency domain and use the number of processor ticks between ticks of horizontal encoder 143 as the input variable. This allows the calculations of the controller to be limited to integers rather than manipulating floats.
The physical drive mechanism of horizontal reciprocating assembly 61 is slide crank assembly 83 as described in greater detail hereinabove. Slide crank assembly 83 allows a single motor (i.e., first motor 79) to slide rigid platform 65 back and forth without the need to change directions. Since first motor 79 is only required to run in one direction, the effect of backlash is eliminated in the system, thereby removing problems with horizontal encoder 143 on back shaft 145 of first motor 79.
It is known that the natural soothing motions a person uses to calm a baby are a combination of at least two motions that each move in a reciprocating motion that has a smooth acceleration and deceleration such that the extremes of the motion slow to a stop before reversing the motion and are fastest in the middle of the motion. This motion is the same as that generated from a sinusoidal motion generated from the combination of the slide crank assembly 83 and the worm gear drive assembly 129. Slide crank assembly 83 and worm gear drive assembly 129 allow the driving motors to run at a constant rotational speed while the output motion provided to seat portion 9 slows and speeds up, mimicking the motion of a person soothing a child. These assemblies also allow the driving motors to run in one direction.
With reference to
Any of the components shown in
Based on the feedback from horizontal encoder 143 and horizontal limit switch 165, the exact position of rigid platform 65 (denoted “hPos”) can be determined at any point in its range of motion. Similarly, based on feedback from vertical encoder 153 and vertical limit switch 167, the exact position of supporting platform 99 (denoted “vPos”) can be determined at any point in its range of motion.
While the control of rigid platform 65 is based entirely on velocity, the control of supporting platform 99 is based upon both position and velocity. For a given horizontal position (hPos) and a given motion, which dictates the number of vertical cycles per horizontal cycles (n) and phase offset (Φ) as shown in Table 1, the desired vPos can be calculated as follows:
Desired_vPos=hPos×v2h_ratio×n+Φ (Equation 1)
where v2h_ratio is a constant defined as the number of vertical encoder ticks per cycle divided by the number of horizontal encoder ticks per cycle. Based on the actual vertical position, the amount of error can be calculated as follows:
posErr=vPos−Desired_vPos (Equation 2)
This error term must be correctly scaled to +/− verticalEncoderTicksPerCycle/2.
As an aside, if the direction of motion in Ocean Wave 204 and Car Ride 200 is irrelevant, there are two possibilities for Desired_vPos for each value of hPos and we can base the vertical error term, posErr, on the closer of the two.
The positional error term, posErr, must then be incorporated into a velocity based feedback control loop. Logically, if the vertical axis is behind (posErr<0), velocity should be increased while if the vertical axis is ahead (posErr>0), velocity should be decreased in proportion to the error as follows:
and h2v_ratio is defined as the horizontal ticks per cycle/vertical ticks per cycle.
The above description is for exemplary purposes only as any suitable control scheme may be utilized. Many possible improvements can be made to this logic. For example, if the control system is too far behind to catch up within some threshold, the controller may be programmed to slow down the vertical axis instead of speeding up. Alternatively, in some situations, it may be desirable to slow down the horizontal axis until the vertical axis is able to synchronize. In addition, while horizontal encoder 143 and vertical encoder 153 were described hereinabove, this is not to be construed as limiting as magnetic encoders, as well as other types of encoders well known in the art may also be used. It may also be desirable to provide an arrangement in which two or more control switches associated with respective motors are required to both be actuated to effect speed control in the desired direction. Furthermore, while it was described that horizontal encoder 143 and vertical encoder 153 only include a single slot, this is not to be construed as limiting as encoders with a plurality of slots may be utilized. However, this disclosure advantageously uses single slot encoders to obtain high resolution feedback while lowering manufacturing costs.
In an exemplary embodiment, infant care apparatus 1 is configured to reciprocate the seat with a vertical displacement of 1.5 inches and a horizontal displacement of 3.0 inches with a vertical displacement frequency range of between about 10 and 40 cycles per minute and a horizontal displacement frequency range of between about 10 and 40 cycles per minute.
In another aspect, a third reciprocation means (not shown) may be added to enable reciprocation of the seat in a third direction orthogonal to the horizontal and vertical directions referenced herein. In one such embodiment, an additional platform would be placed either above or below the horizontal reciprocating assembly 61 to reciprocate the entire drive mechanism 59 in a horizontal direction that is perpendicular to the movement of horizontal reciprocating assembly 61. Using another slide crank assembly drawing power from either an existing motor or an additional motor, infant care apparatus 1 provides three-dimensional movement for an infant, opening up a multitude of additional motion profiles such as mimicking the motion of a traditional swing, for example.
Although an infant care apparatus has been described in detail for the purpose of illustration based on what is currently considered to be the most practical and preferred embodiments, it is to be understood that such detail is solely for that purpose and that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover modifications and equivalent arrangements. For example, it is to be understood that this disclosure contemplates that, to the extent possible, one or more features of any embodiment can be combined with one or more features of any other embodiment.
This application is a continuation of U.S. patent application Ser. No. 15/170,240, filed Jun. 1, 2016, which is a continuation of U.S. patent application Ser. No. 14/446,803, filed Jul. 30, 2014, now U.S. Pat. No. 9,642,474, issued May 9, 2017, which is a continuation of U.S. patent application Ser. No. 13/467,604, filed May 9, 2012, now U.S. Pat. No. 8,827,366 issued Sep. 9, 2014, which is a continuation of U.S. patent application Ser. No. 12/552,607, filed Sep. 2, 2009, now U.S. Pat. No. 8,197,005, issued Jun. 12, 2012, which claims the benefit of priority from U.S. Provisional Patent Application No. 61/093,764, filed Sep. 3, 2008, all of which are hereby incorporated by reference in their entirety.
| Number | Date | Country | |
|---|---|---|---|
| 61093764 | Sep 2008 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15170240 | Jun 2016 | US |
| Child | 15679918 | US | |
| Parent | 14446803 | Jul 2014 | US |
| Child | 15170240 | US | |
| Parent | 13467604 | May 2012 | US |
| Child | 14446803 | US | |
| Parent | 12552607 | Sep 2009 | US |
| Child | 13467604 | US |
