BATHTUB LIFT ASSEMBLY

A bathtub lift assembly for a bathtub is provided. The bathtub lift assembly comprises: a bathtub frame, a lifting assembly including a vertically-extending lift post mounted to the bathtub frame and translatable between a raised configuration and at least one lowered configuration, a post actuator mounted to the bathtub frame, and a transmission assembly mounted to the bathtub frame and operatively connecting the post actuator and the vertically-extending lift post. The transmission assembly can include a ratio multiplier assembly. The bathtub lift assembly can also include a lift post rotation actuator operatively connected to the vertically-extending lift post and activable to configure the vertically-extending lift post between a loading configuration and a bathing configuration.

TECHNICAL FIELD

The present invention relates to reduced mobility assistance accessories. More particularly, it relates to a bathtub lift assembly for raising a seat from a position outside a bathtub, swinging the seat over a cavity of the bathtub, lowering the seat into the cavity of the bathtub, and performing the same in a reverse order.

BACKGROUND

The use of bathtub lifts to assist persons with reduced mobility for transfer into and out of a bathtub is known. Typically, the vertical range of motion of the bathtub lift is limited, and thus the height of the bathtub side walls must be reduced accordingly such that the seat may clear the sidewalls when rotated from the position exterior to the bathtub to the position above the bathtub.

Furthermore, another drawback is that when the bathtub lift is being vertically moved, uncontrolled rotation of the post is possible, causing a safety issue to the person supported by the seat.

In view of the above, there is a need for an improved bathtub lift for a bathtub, which would be able to overcome or at least minimize some of the above-discussed concerns.

SUMMARY

According to a general aspect, there is provided a bathtub lift assembly for a bathtub having a bathing cavity. The bathtub lift assembly comprises: a bathtub frame configured to at least partially surround the bathing cavity of the bathtub; a lifting assembly comprising a vertically-extending lift post mounted to the bathtub frame and translatable along a post axis between a raised configuration and at least one lowered configuration: a linear actuator mounted to the bathtub frame and translatable between an extended configuration and a retracted configuration along a linear actuator axis; and a transmission assembly mounted to the bathtub frame and comprising at least one belt or chain defining a closed-loop path with an actuator section extending along the linear actuator axis and a post section extending along the post axis. The vertically-extending lift post is engaged with the at least one belt or chain in the post section and the linear actuator is engaged with the at least one belt or chain in the actuator section. A translation of the linear actuator between the extended configuration and the retracted configuration drives the at least one belt or chain along the closed-loop path and the vertically-extending lift post between the raised configuration and the at least one lowered configuration.

In an embodiment, the bathtub frame comprises a longitudinally extending section and the linear actuator and the transmission assembly are mounted to the longitudinally extending section of the bathtub frame with the actuator section of the closed-loop path extending longitudinally along the longitudinally extending section of the bathtub frame and the post section of the closed loop path extending vertically along the longitudinally extending section of the bathtub frame.

In an embodiment the vertically-extending lift post comprises a tubular member having a substantially constant diameter from a lower end to an upper end thereof.

In an embodiment, the lifting assembly further comprises a collar bearing mounted to the bathtub frame and at least partially surrounding at least a section of the vertically-extending lift post to guide the vertically-extending lift post between the raised configuration and the at least one lowered configuration.

In an embodiment, a translation of the linear actuator between the extended configuration and the retracted configuration defines a linear actuator course and a translation of the vertically-extending lift post between the raised configuration and a lowest one of the at least one lowered configuration defines a longest post course, the longest post course being longer than the linear actuator course.

In an embodiment, the transmission assembly comprises a ratio multiplier assembly and the at least one belt or chain comprises a first belt or chain defining a first closed-loop path and a second belt or chain defining a second closed-loop path, the first belt or chain and the second belt or chain being engaged with the ratio multiplier assembly, the first belt or chain being driven in rotation around the first closed-loop path by the linear actuator, the second belt of chain being engaged in rotation around the second closed-loop path through the ratio multiplier assembly and engaging the vertically-extending lift post in translation.

In an embodiment, the lifting assembly further comprises a vertical guide assembly including a guiding rail mounted to the bathtub frame and extending substantially parallel to the vertically-extending lift post and a guide translatable with the vertically-extending lift post, the guiding rail and the guide being engageable together for preventing rotation of the vertically-extending lift post during the translation thereof and being disengageable from one another in the raised configuration to allow rotation of the vertically-extending lift post.

In an embodiment, the lifting assembly further comprises a seat support assembly extending from an upper section of the vertically-extending lift post.

According to another general aspect, there is provided a bathtub lift assembly for a bathtub having a bathing cavity. The bathtub lift assembly comprises: a bathtub frame configured to at least partially surround the bathing cavity of the bathtub; a lifting assembly including a vertically-extending lift post mounted to the bathtub frame and translatable along a post axis between a raised configuration and at least one lowered configuration; a lift post translation actuator mounted to the bathtub frame; and a transmission assembly mounted to the bathtub frame and comprising a ratio multiplier assembly and at least two belts or chains including an actuator belt or chain defining an actuator closed-loop path and a post belt or chain defining a post closed-loop path including a post section extending along the post axis. The vertically-extending lift post is engaged with the post belt or chain in the post section. The actuator belt or chain is driven by the lift post translation actuator. The actuator belt or chain and the post belt or chain are operatively connected to one another through the ratio multiplier assembly. The ratio multiplier assembly comprises an input gear or pulley secured to an output gear or pulley of a larger diameter, the input gear or pulley being engaged in rotation by the actuator belt or chain and the output gear or pulley driving the post belt or chain in rotation. Activation of the lift post translation actuator drives the actuator belt or chain and the post belt or chain respectively along the actuator closed-loop path and the post closed-loop path, and the vertically-extending lift post between the raised configuration and the at least one lowered configuration.

In an embodiment, the actuator belt or chain comprises a translation actuator section extending along an actuator axis, the lift post translation actuator being engaged with the actuator belt or chain in the translation actuator section; wherein the bathtub frame comprises a longitudinally extending section; and wherein the lift post translation actuator and the transmission assembly are mounted to the longitudinally extending section of the bathtub frame with the translation actuator section of the actuator belt or chain extending longitudinally along the longitudinally extending section of the bathtub frame and the post section of the post belt or chain extending vertically along the longitudinally extending section of the bathtub frame.

In an embodiment, the lift post translation actuator is a linear actuator and a translation of the linear actuator between an extended configuration and a retracted configuration defines a linear actuator course and a translation of the vertically-extending lift post between the raised configuration and a lowest one of the at least one lowered configuration defines a longest post course, the longest post course being longer than the linear actuator course.

In an embodiment, the vertically-extending lift post comprises a tubular member having a substantially constant diameter from a lower end to an upper end thereof.

In an embodiment, the lifting assembly further comprises a collar bearing mounted to the bathtub frame and at least partially surrounding at least a section of the vertically-extending lift post to guide the vertically-extending lift post between the raised configuration and the at least one lowered configuration.

In an embodiment, the lifting assembly further comprises a vertical guide assembly including a guiding rail mounted to the bathtub frame and extending substantially parallel to the vertically-extending lift post and a guide translatable with the vertically-extending lift post, the guiding rail and the guide being engageable together for preventing rotation of the vertically-extending lift post during a translation thereof and being disengageable from one another in the raised configuration to allow rotation of the vertically-extending lift post. The guide can further comprise at least one slider protruding from the vertically-extending lift post.

In an embodiment, the ratio multiplier assembly has a multiplier ratio of 0.5 to 1.

In an embodiment, the actuator belt or chain at least partially surrounds the input gear or pulley and the post belt or chain at least partially surrounds the output gear or pulley.

In an embodiment, the lifting assembly further comprises a seat support assembly extending from an upper section of the vertically-extending lift post.

According to a further general aspect, there is provided a bathtub lift assembly for a bathtub having a bathing cavity. The bathtub lift assembly comprises: a bathtub frame configured to at least partially surround the bathing cavity of the bathtub; a lifting assembly including a vertically-extending lift post mounted to the bathtub frame and translatable along a post axis between a raised configuration and at least one lowered configuration and rotatable about the post axis between a loading configuration and a bathing configuration; a lift post translation actuator mounted to the bathtub frame and operatively connected to the vertically-extending lift post and activable to translate the vertically-extending lift post between the raised configuration and the at least one lowered configuration; a lift post rotation actuator, translatable between an extended configuration and a retracted configuration, the lift post rotation actuator being mounted to the bathtub frame and activable to rotate the vertically-extending lift post between the bathing configuration and the loading configuration, wherein the lift post rotation actuator and the lift post translation actuator are activable one at a time; and a push-pull assembly. The push-pull assembly comprises a swivel assembly mounted to the bathtub frame and a post rod operatively connecting the vertically-extending lift post and to the swivel assembly. The swivel assembly includes a rotatable roller rotatable about a roller rotation axis, an actuator cam secured to the rotatable roller and engaged with the lift post rotation actuator at an eccentric attachment point with respect to the roller rotation axis, and a post cam secured to the rotatable roller and engaged with the post rod at an eccentric attachment point with respect to the roller rotation axis. Translation of the lift post rotation actuator engages the rotatable roller and the post cam in rotation through the actuator cam and rotation of the post cam displaces the post rod, and displacement of the post rod rotates the lift post between the loading configuration and the bathing configuration, when the vertically-extending lift post is configured in the raised configuration.

In an embodiment, the actuator cam and the post cam rotate simultaneously with the rotatable roller and are angularly offset.

In an embodiment, the lifting assembly further includes a rotation imparting assembly comprising a first connector mounted to the vertically-extending lift post and a second connector operatively connected to the lift post rotation actuator, displaceable by a change of configuration of the lift post rotation actuator, and engageable with the first connector in the raised configuration of the vertically-extending lift post, wherein, when the first connector and the second connector are engaged together, a displacement of the second connector imparts a rotation of the first connector and the vertically-extending lift post about the post axis. The lifting assembly further can comprise a post flange mounted to a lower section of the vertically-extending lift post and the first connector can comprise an aperture defined in the post flange, and the second connector can comprise a pin extending substantially parallel to the vertically-extending lift post, rotatable about the post axis, and engageable with the aperture defined in the flange when the vertically-extending lift post is in the raised configuration. The second connector can comprise a rotation actuator flange at least partially surrounding the post axis and being rotatable thereabout, the pin protruding from the rotation actuator flange, the second connector being operatively connected to the swivel assembly via the post rod wherein a change of configuration of the lift post rotation actuator imparts a rotation to the rotation actuator flange and the pin about the post axis through the swivel assembly and the post rod. The lifting assembly can further comprise a vertical guide assembly including a guiding rail mounted to the bathtub frame and extending substantially parallel to the vertically-extending lift post and the post flange can comprise at least one notch, the guiding rail being engageable with the at least one notch. The at least one notch can comprise a bathing configuration notch and a loading configuration notch, the bathing configuration and the loading configuration notches being angularly offset from one another, the guiding rail being selectively engaged with the bathing configuration notch for translating of the vertically-extending lift post in the bathing configuration and with the loading configuration notch for translating of the vertically-extending lift post in the loading configuration.

The lifting assembly further can comprise a vertical guide assembly including a guiding rail defining an elongated groove extending substantially parallel to the vertically-extending lift post and at least one slider protruding from one of the flange and vertically-extending lift post, the elongated groove being configured to slideably receive the at least one slider therein. The at least one slider can comprise a bathing configuration slider and a loading configuration slider, the bathing configuration and the loading configuration sliders being angularly offset from one another, the elongated groove selectively receiving the bathing configuration slider for translating of the vertically-extending lift post in the bathing configuration and with the loading configuration slider for translating of the vertically-extending lift post in the loading configuration.

In an embodiment, the lift post translation actuator is a linear actuator and a translation of the linear actuator between the extended configuration and the retracted configuration defines a linear actuator course and a translation of the vertically-extending lift post between the raised configuration and a lowest one of the at least one lowered configuration defines a longest post course, the longest post course being longer than the linear actuator course.

In an embodiment, the vertically-extending lift post comprises a tubular member having a substantially constant diameter from a lower end to an upper end thereof.

In an embodiment, the lifting assembly further comprises a collar bearing mounted to the bathtub frame and at least partially surrounding at least a section of the vertically-extending lift post to guide the vertically-extending lift post between the raised configuration and the at least one lowered configuration.

In an embodiment, the bathtub lift assembly further comprises a transmission assembly mounted to the bathtub frame and comprising a ratio multiplier assembly and at least two belts or chains including an actuator belt or chain defining an actuator closed-looped path and a post belt or chain defining a post closed-loop path including a post section extending along the post axis, the vertically-extending lift post being engaged with the post belt or chain in the post section, the actuator belt or chain being driven by the lift post translation actuator, the actuator belt or chain and the post belt or chain being operatively connected to one another through the ratio multiplier assembly, the ratio multiplier assembly comprising an input gear or pulley secured to an output gear or pulley of a larger diameter, the input gear or pulley being engaged in rotation by the actuator belt or chain and the output gear or pulley driving the post belt or chain in rotation, wherein activation of the lift post translation actuator drives the actuator belt or chain and the post belt or chain respectively along the actuator closed-loop path and the post closed-loop path, and the vertically-extending lift post between the raised configuration and the at least one lowered configuration. The actuator belt or chain can comprise a translation actuator section extending along a lift post translation axis and the bathtub frame can comprise a longitudinally extending section. The lift post translation actuator and the transmission assembly can be mounted to the longitudinally extending section of the bathtub frame with the translation actuator section of the actuator belt or chain extending longitudinally along the longitudinally extending section of the bathtub frame and the post section of the post belt or chain extending vertically along the longitudinally extending section of the bathtub frame. The ratio multiplier assembly can have a multiplier ratio of 0.5 to 1. The actuator belt or chain can at least partially surround the input gear or pulley and the post belt or chain can at least partially surround the output gear or pulley.

In an embodiment, the lifting assembly further comprises a seat support assembly extending from an upper section of the vertically-extending lift post.

According to still another general aspect, there is provided a bathtub lift assembly for a bathtub having a bathing cavity. The bathtub lift assembly comprises: a bathtub frame configured to at least partially surround the bathing cavity of the bathtub; a lifting assembly including a vertically-extending lift post mounted to the bathtub frame and a vertical guide assembly, the vertically-extending lift post being translatable along a post axis between a raised configuration and at least one lowered configuration and rotatable about the post axis between a loading configuration and a bathing configuration, the vertical guide assembly including a guiding rail mounted to the bathtub frame and extending substantially parallel to the vertically-extending lift post and a guide translatable with the vertically-extending lift post; and a lift post translation actuator mounted to the bathtub frame and operatively connected to the vertically-extending lift post and activable to translate the vertically-extending lift post between the raised configuration and the at least one lowered configuration; and a lift post rotation actuator mounted to the bathtub frame and activable to rotate the vertically-extending lift post between the bathing configuration and the loading configuration. At least one of the guiding rail and the guide comprises at least a pair thereof at an angularly offset position from one another with respect with the post axis. The pair of the at least one of the guiding rail and the guide is selectively engageable with the other one of the guiding rail and the guide in the loading configuration and the bathing configuration for preventing rotation during the translation of the vertically-extending lift post between the raised configuration and the at least one lowered configuration and being disengageable from one another in the raised configuration to allow rotation of the vertically-extending lift post.

In an embodiment, the lifting assembly can further comprise a post flange mounted to a lower section of the vertically-extending lift post and wherein the pair is a pair of the guide including a bathing configuration guide and a loading configuration guide, the bathing configuration guide and the loading configuration guide being provided on the post flange, the bathing configuration guide being configured to slideably receive the guiding rail for translation in the bathing configuration and the loading configuration guide being configured to slideably receive the guiding rail for translation in the loading configuration. The bathing configuration guide and the loading configuration guide are angularly offset notches defined in the post flange. The lifting assembly further can comprise a post flange mounted to a lower section of the vertically-extending lift post, wherein the guiding rail defines an elongated groove extending substantially parallel to the vertically-extending lift post and the guide comprises a slider protruding from one of the post flange and the vertically-extending lift post, the elongated groove being configured to slideably receive the slider therein. The slider can comprise a bathing configuration slider and a loading configuration slider, the bathing configuration and the loading configuration sliders being angularly offset from one another, the elongated groove selectively receiving the bathing configuration slider for translation of the vertically-extending lift post in the bathing configuration and with the loading configuration slider for translation of the vertically-extending lift post in the loading configuration.

In an embodiment, the lifting assembly further comprises a collar bearing mounted to the bathtub frame and at least partially surrounding at least a section of the vertically-extending lift post to guide the vertically-extending lift post between the raised configuration and the at least one lowered configuration. The collar bearing can be slidably mounted to the bathtub frame and translatable with the vertically-extending lift post between the raised configuration and the at least one lowered configuration. The lifting assembly further can include at least one collar bearing guiding rail and at least one slider secured to the collar bearing and being slideably engaged with the at least one guiding rail to guide the collar bearing and the vertically-extending lift post between the raised configuration and the at least one lowered configuration. The at least one guiding rail can comprise two guiding rails mounted on a respective side of the collar bearing and the at least one slider can comprise two sliders, each one of the two sliders being secured to the collar bearing on a respective side thereof and engaged with a respective one of the two guiding rails.

In an embodiment, the lifting assembly further includes a rotation imparting assembly comprising a first connector mounted to the vertically-extending lift post, and a second connector operatively connected to the lift post rotation actuator, displaceable by the lift post rotation actuator, and engageable with the first connector in the raised configuration of the vertically-extending lift post, wherein when the first connector and the second connector are engaged together, a displacement of the second connector imparts a rotation of the first connector and the vertically-extending lift post about the post axis. The lifting assembly can further comprise a post flange mounted to a lower section of the vertically-extending lift post and the first connector can comprise an aperture defined in the post flange, and the second connector can comprise a pin extending substantially parallel to the vertically-extending lift post and engageable with the aperture defined in the post flange when the vertically-extending lift post is in the raised configuration.

In an embodiment, the lift post translation actuator is a linear actuator and a translation of the linear actuator between an extended configuration and a retracted configuration defines a linear actuator course and a translation of the vertically-extending lift post between the raised configuration and a lowest one of the at least one lowered configuration defines a longest post course, the longest post course being longer than the linear actuator course.

In an embodiment, the vertically-extending lift post comprises a tubular member having a substantially constant diameter from a lower end to an upper end thereof.

In an embodiment, the bathtub lift assembly further comprises a transmission assembly mounted to the bathtub frame and comprising a ratio multiplier assembly and at least two belts or chains including an actuator belt or chain defining an actuator closed-looped path and a post belt or chain defining a post closed-loop path including a post section extending along the post axis, the vertically-extending lift post being engaged with the post belt or chain in the post section, the actuator belt or chain being driven by the lift post translation actuator, the actuator belt or chain and the post belt or chain being operatively connected to one another through the ratio multiplier assembly the ratio multiplier assembly comprising an input gear or pulley secured to an output gear or pulley of a larger diameter, the input gear or pulley being engaged in rotation by the actuator belt or chain and the output gear or pulley driving the post belt or chain in rotation, wherein activation of the lift post translation actuator drives the actuator belt or chain and the post belt or chain respectively along the actuator closed-loop path and the post closed-loop path, and the vertically-extending lift post between the raised configuration and the at least one lowered configuration. The actuator belt or chain can comprise a lift post translation actuator section extending along a lift post translation axis and the bathtub frame can comprise a longitudinally extending section and wherein the lift post translation actuator and the transmission assembly are mounted to the longitudinally extending section of the bathtub frame with the lift post translation actuator section of the actuator belt or chain extending longitudinally along the longitudinally extending section of the bathtub frame and the post section of the post belt or chain extending vertically along the longitudinally extending section of the bathtub frame. The ratio multiplier assembly can have a multiplier ratio of 0.5 to 1. The actuator belt or chain can at least partially surround the input gear or pulley and the post belt or chain can at least partially surround the output gear or pulley.

In an embodiment, the lifting assembly further comprises a seat support assembly extending from an upper section of the vertically-extending lift post, the seat support assembly having a section extending above the bathing cavity in the bathing configuration. The lifting assembly can further comprise a seat mounted to the seat support assembly, the seat extending outwardly of the bathing cavity in the raised configuration of the vertically-extending lift post and in the lowered and loading configuration of the vertically-extending lift post, and inside the bathing cavity in the lowered and bathing configuration of the vertically-extending lift post.

Other features and advantages of the invention will be better understood upon reading of embodiments thereof with reference to the appended drawings.

DETAILED DESCRIPTION

In the following description, similar features in the drawings have been given similar reference numerals. In order to not unduly encumber the figures, some elements may not be indicated on some figures if they were already mentioned in preceding figures. It should also be understood herein that the elements of the drawings are not necessarily drawn to scale and that the emphasis is instead being placed upon clearly illustrating the elements and structures of the present embodiments.

Moreover, although the embodiments of the bathtub lift assembly for a bathtub consist of certain geometrical configurations as explained and illustrated herein, not all of these components and geometries are essential and thus should not be taken in their restrictive sense. It is to be understood, as also apparent to a person skilled in the art, that other suitable components and cooperation thereinbetween, as well as other suitable geometrical configurations, may be used for the bathtub lift assembly, as will be briefly explained herein and as can be easily inferred herefrom by a person skilled in the art. Moreover, it will be appreciated that positional descriptions such as “above”, “below”, “left”, “right”, “front” and “rear” and the like should, unless otherwise indicated, be taken in the context of the figures and should not be considered limiting.

In accordance with embodiments, there is provided a bathtub lift assembly for assisting people with reduced mobility during the transfer from outside of a bathtub to inside of the bathtub and conversely. Some embodiments of the present invention may be particularly useful in a bathtub. Embodiments described hereinbelow permit the fabrication of compact bathtub lift assembly for a bathtub, conjugating stable displacement and constant velocity, as required by the market of such products. In one embodiment, the bathtub lift assembly may be used with a residential bathtub for assisting a person with reduced mobility to safely move from outside the bathtub to inside the bathtub in a stabilized motion. Alternatively, the bathtub lift assembly may be used with pool, hospital bathtub, or the like.

Referring toFIG. 1, an embodiment of a bathtub lift assembly10for a bathtub12for assisting people with reduced mobility is shown.

The bathtub lift assembly10includes a bathtub frame14at least partially surrounding the bathtub12. The bathub12can include a tub insert defining a bathing cavity18in which a seat96of the bathtub lift assembly10can be at least partially inserted, as will be described in more details below. Of note, reference to a bathtub12herein includes conventional bathtub and other types of tubs, such as a hot tub, a therapeutic tub, or tub-showers.

In the embodiment shown, the bathtub frame14includes sidewalls16, with longitudinally extending sections and transversally extending sections. The sidewalls16define a cavity in which a tub insert of the bathtub12can be inserted and received.

In an alternative embodiment (not shown), the shape of the bathtub12can be defined by the sidewalls16of the structural bathtub frame14and the cavity18can substantially correspond to the cavity defined by the sidewalls16. Alternatively, as shown in the accompanying figures, the structural bathtub frame14can receive and support a tub insert of the bathtub12.

The bathtub frame14also provides mounting points to receive and support to the various components of the bathtub lift assembly10which will be described herein below.

The bathtub frame14may be outfitted with outer panels (not shown) and materials to give the bathtub12a finished look. For example, the bathtub frame14may be covered with a plastic or other type of material. Illustratively, the bathtub frame14may be formed from steel, but other materials, such as aluminium, plastic, any other materials having the desired properties or a combination thereof may be employed.

Now referring toFIGS. 1 to 4, the bathtub lift assembly10further includes a lifting assembly20for displacing the seat between lowered, raised, loading, and bathing configurations, as will be described in more details below. Amongst others, the lifting assembly20includes a vertically-extending lift post22mounted to the bathtub frame14and translatable along a post axis23between a raised configuration and at least one lowered configuration. The post axis23corresponds to a longitudinal axis of the vertically-extending lift post22. For example, as illustrated inFIGS. 1 and 3, the vertically-extending lift post22is shown in the raised configuration. As illustrated inFIG. 2, the vertically-extending lift post22is shown in a one of the lowered configurations and, more particularly, a lowest one of the lowered configurations, i.e. a loading configuration. As illustrated inFIG. 4, the vertically-extending lift post22is shown in another one of the at least one lowered configuration which also corresponds to a bathing configuration.

Since a height of the vertically-extending lift post22in the loading and the lowest one of the lowered configurations can differ from the height of the vertically-extending lift post22in the bathing and the other one of the lowered configurations, the lowered configurations will be referred to as the at least one lowered configuration. It is appreciated that the vertically-extending lift post22can be translated from the raised configuration to one, two or more lowered configurations.

Thus, with the respect to its height, the vertically-extending lift post22can be selectively configured by translation along the post axis23between a raised configuration and at least one lowered configuration. With respect to its angular position, the vertically-extending lift post22can be selectively configured between the loading configuration and the bathing configuration. In the bathing configuration (FIG. 1), a seat mounted to the vertically-extending lift post22is positioned above the bathing cavity18of the bathtub12, while in the loading configuration (FIG. 2), the seat is positioned beside the bathing cavity18of the bathtub12.

The vertically-extending lift post22is thus translatable along the post axis23to allow a person to be transported by the lifting assembly20from a position exterior and adjacent to the bathtub12and the bathing cavity18when the vertically-extending lift post22is in the loading configuration, and to the bathing configuration where the person is lowered into the bathing cavity18. As well, a person may be transported by the lifting assembly20in a reverse manner, for example from a position within the bathing cavity18when the vertically-extending lift post22is in the bathing configuration, to the loading configuration where the person is moved exterior to the bathing cavity18and adjacent the bathtub12.

The vertically-extending lift post22is illustratively embodied as a cylindrical tube-like structure, which may be hollow or solid for example, and is disposed in a substantially vertical orientation relative to the sidewalls16. The vertically-extending lift post22is illustratively mounted to the bathtub frame14at a front side corner of the bathtub12. Of course, the vertically-extending lift post22may be mounted to the bathtub frame14at other positions, such as different corners or on an upper section of the sidewalls16.

In an embodiment, the vertically-extending lift post22includes a tubular member which has a substantially constant diameter from a lower end of the vertically-extending lift post to an upper end of the vertically-extending lift post. In an embodiment, the vertically-extending lift post22is not a telescopic assembly to provide an increased stability and a substantially constant translation speed.

In the illustrated embodiments ofFIGS. 1 to 4, the bathtub lift assembly10further includes a lift post translation actuator24mounted to the bathtub frame14to translate the vertically-extending lift post22. In the embodiments shown, the actuator24is a linear actuator translatable between an extended configuration and a retracted configuration along a linear actuator axis25. Illustratively, the linear actuator24includes a piston26which is extendable and retractable from a housing28under a form of activation, such as air or a fluid. Other types of actuators24may also be provided, such as an electric rod-style actuator, or a rotary actuator. In the illustrated embodiment, the linear actuator axis25corresponds to a longitudinal axis of the piston26. In the embodiment shown, the linear actuator axis25extends substantially perpendicular to the post axis23. In accordance with an embodiment, the linear actuator axis25extends along a longitudinally extending one of the sidewalls16of the bathtub frame14, in a substantially horizontal orientation. The lift post translation actuator24is shown mounted to a longitudinally-extending one of the sidewalls16, for example using bolts, screws or the like, and is configured such that the piston26is extendable and retractable along a longitudinally-extending section of the bathtub frame14. Of course, other angles of the linear actuator axis25relative to the bathtub frame14may also be provided.

In the illustrated embodiments, the bathtub lift assembly10further includes a transmission assembly30mounted to the bathtub frame14and, more particularly, to the longitudinally-extending sidewall16including the lift post translation actuator24to increase the course of the vertically-extending lift post22. The transmission assembly30includes at least one belt or chain32defining a path with an actuator section34extending along the linear actuator axis25and a post section36extending along the post axis23. The vertically-extending lift post22is engaged with the at least one belt or chain32in the post section36and the lift post translation actuator24is engaged with the at least one belt or chain32in the actuator section34. A translation of the lift post translation actuator24between the extended configuration and the retracted configuration drives the at least one belt or chain32along the path and the vertically-extending lift post22between the raised configuration and the at least one lowered configuration.

In the illustrated embodiments ofFIGS. 3 and 4, the transmission assembly30also includes a ratio multiplier assembly52. More particularly, the at least one belt or chain32includes an actuator belt or chain54which defines an actuator closed-loop path and a post belt or chain56which defines a post closed-loop path. The actuator belt or chain54includes the actuator section34and the lift post translation actuator24is engaged with the actuator belt or chain54in the actuator section34. The post belt or chain56includes the post section36extending along the post axis23. As mentioned above, the vertically-extending lift post22is engaged with the post belt or chain56in the post section36. The actuator belt or chain54and the post belt or chain56are operatively connected to one another through the ratio multiplier assembly52. In the embodiment shown, the ratio multiplier assembly52has an input gear or pulley58secured to an output gear or pulley60of a larger diameter. The input and output gears or pulleys58,60rotate simultaneously at the same rotation speed. The actuator belt or chain54is driven by the lift post translation actuator24and partially surrounds the input gear or pulley58. Thus, the input gear or pulley58is engaged in rotation by the actuator belt or chain54and the output gear or pulley60, which is at least partially surrounded by the post belt or chain56, drives the post belt or chain56. Upon activation, the lift post translation actuator24drives the actuator belt or chain54and the post belt or chain56respectively along the actuator closed-loop path and the post closed-loop path, and the vertically-extending lift post22between the raised configuration and the at least one lowered configuration. As a result of such a configuration, the range of motion of the lift post translation actuator24translates into a multiplied range of motion of the vertically-extending lift post22as a result of a multiplier ratio of the ratio multiplier assembly52.

In accordance with an embodiment, the ratio multiplier assembly52has a multiplier ratio of 0.5 to 1. Of course, other ratios and configurations of the input gear58and the output gear60may be provided so as to provide a multiplying effect. It is appreciated that in alternative embodiments, the transmission assembly30can include more than one ratio multiplier assembly52and more than two belt or chains.

In the illustrated embodiment, the actuator belt or chain54and the post belt or chain56are wrapped around pulleys38,58,60so as to define an L-shaped path with the actuator or chain54defining a closed-loop path with the actuator section34, while the post belt or chain56defines a closed-looped path with the post section36which is illustratively substantially vertical to the bathtub12and adjacent to the vertically-extending lift post22. In the embodiment shown, the post section of the post belt or chain56extends substantially along an entire height of the bathtub frame14, from a lower end to an upper end thereof.

In the embodiment shown and as mentioned above, the actuator belt or chain54partially surrounds the input gear or pulley58while the post belt or chain56partially surrounds the output gear or pulley60. However, in an alternative embodiment (not shown), the transmission assembly can include more than two belts or chains and two or more ratio multiplier assembly and, thus, the actuator belt or chain54and the post belt or chain56can be operatively connected through at least one intermediate belt or chain.

In the embodiment shown in the accompanying figures, the at least one belt or chain32, i.e. the actuator belt or chain54and the post belt or chain56, is shown as a continuous flat belt such as a serpentine belt. It is appreciated that other types of belt may be employed, such as and without being limitative a chain belt, a vee-belt, a chain or the like. Similarly, in the embodiment shown in the accompanying figures, the input and output gears or pulleys58,60are shown as cog wheels but it is appreciated that other types of gears or pulleys can be employed.

A translation of the lift post translation actuator24between the extended configuration and the refracted configuration defines a linear actuator course and a translation of the vertically-extending lift post22between the raised configuration and a lowest one of the at least one lowered configuration defines a longest post course. With the ratio multiplier assembly52, the longest post course is longer than the linear actuator course.

Now referring toFIGS. 3 and 4, in the embodiment shown, the post belt or chain56in the post section36is engaged with the vertically-extending lift post22via an L-shaped bracket35engaged to a lower section37of the vertically-extending lift post22.

The bathtub lift assembly10further includes a bracket assembly40to connect a piston tip39of the piston26to the actuator section34of the at least one belt or chain32and, more particularly, the actuator belt or chain54in the embodiment shown. The bracket assembly40is configured to slideably engage with a slot42provided in the sidewall16to guide the movement of the piston tip39along the linear actuator axis25.

It is appreciated that, in alternative embodiments (not shown), the mechanical connexion between the at least one belt or chain32and the vertically-extending lift post22and the lift post translation actuator24can vary from the embodiments shown.

The above described bathtub lift assembly10allows for the vertically-extending lift post22to be translatable between the raised configuration and the at least one lowered configuration. The positioning of the lift post translation actuator24, i.e. to extend along a longitudinal axis of the bathtub frame14and normal to the post axis23, and the connection of the lift post translation actuator24to the vertically-extending lift post22via the ratio multiplier assembly52allows for the vertically-extending lift post22to translate over a greater range of motion as compared to a linear actuator provided directly below the vertically-extending lift post22. The greater range of motion is provided without a telescopic lift post and, thus, an increased stability and a substantially constant speed during displacement can be obtained.

In the embodiment shown inFIGS. 1 to 10, the lifting assembly20further includes a collar bearing44secured to the bathtub frame14and surrounding at least a section of the vertically-extending lift post22to guide the vertically-extending lift post22between the raised configuration and the at least one lowered configuration. The collar bearing44provides support to the vertically-extending lift post22as it is translatable along the post axis23between the raised configuration and at least one lowered configuration to maintain the vertically-extending lift post22in the vertical orientation, while still allowing a rotation of the vertically-extending lift post22in a manner which will be discussed herein below. In the embodiment shown, the collar bearing44is secured to an upper section of the bathtub frame14. It is appreciated that it can be secured at any height along the bathtub frame14in alternative implementations.

In the embodiment shown, the lifting assembly20also includes a post flange70mounted to the lower section37of the vertically-extending lift post22and protruding outwardly from the vertically-extending lift post22. In the embodiment shown, the post flange70has a substantially annular shape but it is appreciated that its shape and configuration can vary from the embodiment shown. According to the illustrated embodiments, the post flange70is mounted and secured to a lower end of the vertically-extending post22, but it is appreciated that the post flange70can be mounted to a portion that is nearby the end of the vertically-extending lift post22. In the embodiment shown, in the raised configuration of the vertically-extending post22, the post flange70almost abuts against a lower surface of the collar bearing44in the raised configuration of the vertically-extending post22.

Referring now toFIGS. 5 and 6, in an embodiment, the bathtub lift assembly10further includes a lift post rotation actuator62mounted to the bathtub frame14and activable to rotate the vertically-extending lift post22between the bathing configuration and the loading configuration, i.e. to modify its angular position. In an embodiment, the lift post rotation actuator62is activable solely in the raised configuration of the vertically-extending lift post22. In an embodiment, the lift post translation actuator24is activable solely in the bathing configuration and the loading configuration, i.e. the lift post translation actuator24is not activable in intermediate configuration between the bathing configuration and the loading configuration. As a consequence, the vertically-extending lift post22is prevented from rotating about the post axis23during translation between the at least one lowered configuration and the raised configuration and the vertically-extending lift post22is prevented from translating between the at least one lowered configuration and the raised configuration inbetween the bathing configuration and the loading configuration. Thus, in an embodiment, the lift post rotation actuator62and the lift post translation actuator24are activable one at a time.

In an embodiment, the lifting assembly20also includes a rotation imparting assembly64operatively engaged with the vertically-extending lift post22to rotate same about the post axis23. More particularly, in the embodiment shown, the rotation imparting assembly64includes a rotation actuator flange65at least partially surrounding the vertically-extending lift post22and, more particularly, rotatable about the vertically-extending lift post22. In the embodiment shown, the rotation actuator flange65is juxtaposed to a lower surface of the collar bearing44.

In accordance with an embodiment, the lift post rotation actuator62is a linear actuator translatable between an extended configuration and a retracted configuration, and the bathtub lift assembly10further includes a push-pull assembly78operatively connecting the lift post rotation actuator62and the rotation imparting assembly64. The push-pull assembly78includes a swivel assembly84engaged with the lift post rotation actuator62and a post rod82operatively connected with the rotation actuator flange65of the rotation imparting assembly64. The swivel assembly84is configured to pull or push the post rod82when the lift post rotation actuator62is activated. For example, translation of the lift post rotation actuator62(i.e. between the retracted configuration to the extended configuration or vice-versa) engages the swivel assembly84in rotation, which in turn, pull or push the post rod82in accordance with the translation direction of the lift post rotation actuator62and the rotation direction of the swivel assembly84. Displacement of the post rod82engages the lift post22in rotation between the loading configuration (FIG. 6) and the bathing configuration (FIG. 7), as will be described in more details below. More particularly, in the embodiment shown, translation of the lift post rotation actuator62between the extended configuration to the retracted configuration drives the swivel assembly84to rotate to push the post rod82and rotate the vertically-extending lift post22, illustratively about the post axis23, from the loading configuration (FIG. 6) to the bathing configuration (FIG. 7). On the contrary, translation of the lift post rotation actuator62between the retracted configuration to the extended configuration drives the swivel assembly84to rotate to pull the post rod82and rotate the vertically-extending lift post22, illustratively about the post axis23, from the bathing configuration (FIG. 7) to the loading configuration (FIG. 6).

In the illustrated embodiments ofFIGS. 6 and 7, the swivel assembly84is mounted to the bathtub frame14, in an upper section thereof. More particularly, a swivel assembly casing89of the swivel assembly84is secured to bathtub frame14. The post rod82extends between the rotation actuator flange65surrounding the vertically-extending lift post22and the swivel assembly84and operatively connect the vertically-extending lift post22and the swivel assembly84together, as will be described in more details below. The swivel assembly84includes a rotatable roller85inserted in the swivel assembly casing89and rotatable about a roller rotation axis87, an actuator cam81secured to the rotatable roller85and engaged with the lift post rotation actuator62at an eccentric attachment point80with respect to the roller rotation axis87, and a post cam83secured to the rotatable roller85and engaged with the post rod82at an eccentric attachment point88with respect to the roller rotation axis87. More particularly, a distal end of the lift post rotation actuator62is pivotally mounted to the actuator cam81at the eccentric attachment point80while an end of the post rod82is also pivotally mounted to the post cam83at the eccentric attachment point88Translation of the lift post rotation actuator62engages the rotatable roller85and the post cam83in rotation through the actuator cam81and rotation of the post cam83displaces the post rod82. In turn, displacement of the post rod82rotates the rotation actuator flange65about the post axis23.

In the embodiment shown, the actuator cam81and the post cam83are angularly offset and rotate simultaneously with the rotatable roller85upon the displacement of the post rod82. In the embodiment shown and without being limitative, the actuator cam81and the post earn83have an angular offset of about 180 degrees.

As mentioned above, in the embodiment shown, the rotation actuator flange65is rotatable about the lift post22. This configuration is provided to prevent rotation of the lift post22during vertical translation thereof and solely allow rotation when the lift post22is in the raised configuration. However, in an alternative embodiment (not shown), it is appreciated that the rotation actuator flange65can be secured to the lift post22to directly engage the latter in rotation between the loading configuration and the bathing configuration upon rotation thereof.

In the embodiment shown, the rotation actuator flange65is part of a second connector of the rotation imparting assembly64. More particularly, in the embodiment shown, the rotation imparting assembly64also includes a first connector66provided on the vertically-extending lift post22, and the second connector68operatively connected to the lift post rotation actuator62. More particularly, in the embodiment shown, the first connector66includes an aperture74defined in the post flange70of the lifting assembly20. The second connector68includes the rotation actuator flange65surrounding and secured the vertically-extending lift post22and a pin76extending downwardly from the rotation actuator flange65, substantially parallel to the vertically-extending lift post22. The pin76is engageable with the aperture74defined in the post flange70in the raised configuration of the vertically-extending lift post22, the pin76and the aperture74being substantially complementary in shape. In other configurations than the raised configuration, the first and second connectors66,68are disengaged. As mentioned above, the vertically-extending lift post22is engageable in rotation by the lift post rotation actuator62in the raised configuration of the vertically-extending lift post22, when the first and second connectors are engaged together. Thus, when the first connector66and the second connector68are engaged as illustrated inFIGS. 5 and 8, a rotation of the second connector68(including the rotation actuator flange65) imparts a rotation of the post flange70, through the first connector66, and the vertically-extending lift post22to which the post flange70is secured. As mentioned above, a change of configuration of the lift post rotation actuator62imparts a rotation to the rotation actuator flange65and the pin76through the swivel84assembly and the post rod82.

FIGS. 6 and 7show the vertically-extending lift post22in a configuration lower than the raised configuration and wherein the first and second connectors66,68are disengaged from one another. Therefore, activation of the lift post rotation actuator62does not engage the vertically-extending lift post22in rotation about the post axis23when the vertically-extending lift post22is not configured in the raised configuration.

In accordance with the embodiment shown, the lifting assembly20further includes a vertical guide assembly86to guide the displacement of the vertically-extending lift post22during translation between the at least one lowered configuration and the raised configuration and to prevent rotation during translation. In the embodiment shown, the vertical guide assembly86includes a guiding rail92extending substantially parallel to the vertically-extending lift post22, and a guide90provided in connection with the vertically-extending lift post22. The guiding rail92and the guide90are substantially complementary in shape to be engageable together. In the embodiment shown, the vertical guide assembly86includes two guides90that are at a radially offset position from one another. The to guides90are selectively engageable with the guiding rail92in the loading configuration and the bathing configuration for preventing rotation during the translation of the vertically-extending lift post22between the raised configuration and the at least one lowered configuration. The two guides90are disengaged from the guiding rail92in the raised configuration to allow rotation of the vertically-extending lift post22. Thus, when the first and second connectors66,68of the rotation imparting assembly64are engaged together in the raised configuration, the guiding mil(s)92and the guide(s)90are disengaged from one another. Similarly, when the guiding rail(s)92is(are) engaged with respective one(s) of the guide(s)90during translation of the vertically-extending lift post22, the first and second connectors66,68of the rotation imparting assembly64are disengaged from one another. Thus, in an embodiment, the guiding rail92ends below, or substantially at a same height, than a tip of the pin76.

It is appreciated that, in an alternative embodiment, the vertical guide assembly86can include one or more guides90.

The two guides90being angularly offset, they are selectively engaged with the guiding rail92for translation of the vertically-extending lift post22. A first one of the guides90(i.e. a bathing configuration guide) is engaged with the guiding rail92for translation in the bathing configuration while a second one of the guides90(i.e. a loading configuration guide) is engaged with the guiding rail92for translation in the loading configuration. For example, as shown inFIG. 6, one of the two guides90is selectively engaged with the guiding rail92when the vertically-extending lift post22is in the loading configuration for preventing rotation of the vertically-extending lift post22during the translation of the vertically-extending lift post22between the raised configuration and one lowered configuration. For example, as shown inFIG. 7, the other one of the at least two guides90is selectively engaged with the guiding rail92when the vertically-extending lift post22is in the bathing configuration for preventing rotation of the vertically-extending lift post22during the translation of the vertically-extending lift post22between the raised configuration and the other one lowered configuration.

In the embodiment shown, the guiding rail92is a protruding and elongated track and the guides90are notches, i.e. indentations defined in the post flange70and, more particularly, a bathing configuration notch and a loading configuration notch. The notches90are configured to selectively slideably receive the guiding rail92therein. When the notches90slideably receive the guiding rail92, the vertically-extending lift post22is prevented from rotating about the post, axis23. In an embodiment, the shape of the guides90is substantially complementary to the shape of the guiding rail92and can differ from the embodiment shown.

In an alternative embodiment (not shown), the guide(s)90can include slider(s) (not shown) protruding from the vertically-extending lift post22or the post flange70and the guiding rail92can define an elongated groove extending substantially parallel to the vertically-extending lift post22, wherein the elongated groove is configured to slideably receive the slider(s) therein. In an embodiment, the sliders include a bathing configuration slider engageable with the guiding rail92for translation in the bathing configuration and a loading configuration slider engageable with the guiding rail92for translation in the loading configuration.

In another alternative embodiment (not shown), the vertical guide assembly86can include a guide selectively engageable with two or more guiding rails, each one of the guiding rails corresponding to a respective one of the loading and bathing configurations. Thus, the guide is selectively engageable with a first one of the guiding rails for translation between one of the lowered configurations and the raised configuration in the loading configuration and the guide is selectively engageable with a second one of the guiding rails for translation between one of the lowered configurations and the raised configuration in the bathing configuration.

Now referring toFIGS. 11 and 12, an alternative embodiment of a collar bearing144for the lifting assembly120will be described, wherein the features are numbered with reference numerals in the100series which correspond to the reference numerals of the previous embodiment. The collar bearing144is slidably mounted to the bathtub frame114. The vertically-extending lift post122is engaged with the translatable collar bearing144to translate therewith between the raised configuration and at least one lowered configuration. In the embodiment shown, the collar bearing144includes a body144awith a central aperture and a sleeve bearing144babutted against an upper end of the body144a.The collar bearing144also includes a closing flange171and a connecting stem173provided at opposed ends of the body144a.The closing flange171is mounted to the body144aand closes the central aperture thereof at a lower end thereof. The connecting stem173has an end secured to the collar bearing144, in an upper section thereof, and protrudes from the collar bearing144. The upper section of the connecting stem173is inserted in an aperture defined in a lower section of the vertically-extending lift post122. The lower end of the vertically-extending lift post122abuts against the sleeve bearing144b,i.e. the sleeve bearing144bextends between the body144aand the vertically-extending lift post122. Thus, the vertically-extending lift post122is rotatable about the body144aof the collar bearing144. It is appreciated that the engagement between the collar bearing144and the vertically-extending lift post122can differ from the embodiment shown provided that the vertically-extending lift post122is rotatable with respect to the collar bearing144and translatable by the collar bearing144.

In the embodiment shown, the lifting assembly120includes two collar bearing guiding rails146mounted to the bathtub frame114and extending substantially parallel to the vertically-extending lift post122, and two sliders148secured to the collar bearing144and translating therewith. More particularly, each one of the sliders148is secured to the collar bearing144, on a respective side thereof. A first one of the collar bearing guiding rails146is mounted to one of the longitudinally extending sidewalls and a second one of the collar bearing guiding rails146is mounted to one of the transversally extending sidewalls (or bathtub frame sections). Each one of the sliders148is slideably engageable with a respective one of the collar bearing guiding rails146to guide the assembly including the vertically-extending lift post122and the collar bearing144between the raised configuration and the at least one lowered configuration.

Even though in the illustrated embodiment ofFIG. 11, two collar bearing guiding rails146and two corresponding sliders148are shown, it is appreciated that the lifting assembly120can include one or more collar bearing guiding rail146and slider148.

As the embodiment shown inFIGS. 1 to 10, the embodiment shown inFIGS. 11 and 12also includes a rotation imparting assembly164. The rotation imparting assembly164includes a first connector166embodied by an aperture174defines in a post flange170. The post flange170is provided above the collar bearing144and is secured to the vertically-extending lift post122and translates vertically therewith between the at least one lowered configuration and the raised configuration. The rotation imparting assembly164also includes a second connector (not shown) including a rotation actuator flange and a pin (not shown) protruding from the rotation actuator flange. The rotation imparting assembly164is provided close to an upper end of the bathtub frame and is not shown inFIGS. 11 and 12but is similar to the one described in reference toFIGS. 1 to 10. The rotation actuator flange is rotatable about the vertically-extending lift post122and is operatively connected the lift post rotation actuator. For instance and without being limitative, the rotation actuator flange can be operatively connected the lift post rotation actuator through the assembly including the swivel assembly described above in reference toFIGS. 1 to 10. Thus, activation of the lift post rotation actuator engages the rotation actuator flange is rotation about the post axis. As the pin76, the pin of the second connector is engageable with the aperture174defined in the post flange170in the raised configuration of the vertically-extending lift post122. Thus, in the raised configuration, the vertically-extending lift post122is engageable in rotation by the lift post rotation actuator62throught the engagement of the first and second connectors.

The lifting assemblies20,120can further include a seat support assembly98extending from an upper section94of the vertically-extending lift post22,122, the seat support assembly98has a section extending above the bathing cavity18in the bathing configuration as illustrated inFIG. 4.

In an embodiment, the lifting assemblies20,120can further include a seat96mounted to the seat support assembly98, the seat96extending outwardly of the bathing cavity18in the raised configuration of the vertically-extending lift post22,122and in the lowered and loading configurations of the vertically-extending lift post22,122, and inside the bathing cavity18in the lowered and bathing configurations of the vertically-extending lift post22,122. As a result, a person of reduced physical mobility may be seated on the seat96when the vertically-extending lift post22,122is in the loading and lowered configuration and be moved by the translation of the vertically-extending lift post22,122to the bathing configuration where the seat96, and the person are positioned within the bathing cavity18.

In an embodiment, the actuators24,62, the ratio multiplier assembly52, the rotation imparting assembly64, the swivel assembly84can be covered by panels and hidden from the patient and the user, i.e. enclosed in the bathtub frame14.