Patent Application
20160015849
The present disclosure is related to a molded part that forms a retainer device. The device includes moveable members for engaging an inwardly or outwardly supported article.
Dispensing devices for providing a fragrance to a room are known. These devices usually include a reservoir for holding a volatile liquid that contains the beneficial properties. A wick may be used to transition the volatile liquid from the reservoir to the environment. The wick is positioned with one end located in the volatile liquid and the opposite end located outside of the container. Using capillary action the liquid is drawn up the length of the wick. Once the liquid reaches the outside of the container it is vaporized and dispersed throughout the environment by simple diffusion or with the assistance of a heater, flame, fan or other device.
Numerous types of retaining devices are used to hold the wick securely in place within known dispensing devices. Known methods of securing the wick within these retaining devices include inserting a pin through the wick or using the holding device to secure the wick such that its removal is not possible. Several additional retaining methods for securing the wick have also been previously disclosed.
U.S. Pat. No. 1,198,664 to Reynolds shows a torch device having a cylindrical wick holding structure. Two barbs or points are formed in the sidewall of the holder that engage the wick and prevent movement back into the container.
U.S. Pat. No. 367,421 to Melchior shows a holding structure for a burner having three pivoting hooks positioned around the periphery of the wick to hold it in a desired position. The hooks are separately formed from the base structure and are pivotably attached to outwardly projecting tabs.
U.S. Pat. No. 4,437,832 to Amano et al. shows a lamp assembly having a wick supported by a first holder member and an auxiliary holder. A flexible engagement strip is attached at one end to a sidewall of the first holder. The strip includes a pawl on the free end. The pawl projects through a window in the holder and through slits in the auxiliary holder to engage an opening in the wick.
U.S. Pat. No. 7,303,143 to Davis et al. shows a bottle and wick holder combination. The tolerances of the internal openings of the wick holder are such that a frictional fit is created with the wick.
U.S. Pat. No. 6,619,560 to Chun shows a bottle and wick holding assembly wherein portions of the sidewalls of the wick holder flex inwardly upon engagement with a clip that forms an internal shoulder within the supporting element.
It is also known to create molded parts having a central hollow core. The mold for such parts includes an outer mold portion, comprising one or more members, and an inner mold portion that is moveable with respect to the outer mold portion. The mold cavity is defined between the two mold portions. A molten plastic material is injected into the mold cavity to form the molded part. After molding and cooling of the part within the mold cavity, one or both of the mold portions is/are moved relative to the other along a line of draw. Once sufficient clearance is created, the molded part is ejected from the mold.
A molded retainer is provided for supporting a wick within a dispensing device. A method of molding the molded retainer is also provided.
In one aspect of the disclosure, a molded retainer has a retainer body defined by one or more sidewalls, the one or more sidewalls formed about an axial opening that is formed about a central axis. At least one engagement opening is formed in the sidewall. The engagement opening is positioned substantially transverse to the axial opening. At least one engagement member is integrally formed with the retainer body and is pivotably connected to the sidewall within the engagement opening. The engagement member is pivotable between a first position and a second position, wherein at least a portion of the engagement member is located within the axial opening in the first position and at least a portion of the engagement member is located outside of the axial opening in the second position.
In a further aspect of the disclosure the retainer body is co-axially formed about the central axis of the axial opening and the retainer body is cylindrical. The diameter of the outer surface of the retainer body is variable and preferably tapers towards a first end. The axial opening is preferably substantially cylindrical.
In a further aspect of the disclosure the engagement member of the molded retainer has a projection for the engagement of an article positioned within the axial opening when the engagement member is in the first position. The engagement member is preferably substantially triangular, wherein a first corner of the triangle forms a pivot connection between the engagement member and the sidewall of the retainer body and the second corner of the triangle constitutes the projection. The molded retainer may comprise a plurality of engagement members located within respective engagement openings, with each engagement member integrally formed with the retainer body and pivotably connected to the sidewall.
In a further aspect of the disclosure a method of forming a molded retainer, is defined by providing a first mold portion and a second mold portion, integrally forming a retainer body and an engagement member. The movable mold portion is moved away from the retainer body. The retainer body and engagement member are ejected from the other mold portion. At least one of the mold portions is movable with respect to the other mold portion along a line of draw. A mold cavity is defined between the first and second mold portions. The cavity defining a retainer body with one or more sidewalls formed about an axial opening having at least one engagement opening. The engagement opening is positioned substantially transverse to the axial opening. The retainer body has at least one engagement member positioned within the engagement opening and is pivotably connected to the sidewall. In the first position, at least a portion of the engagement member interferes with the line of draw for the one mold portion. Upon ejection, the engagement member pivots from the first position to a second position. In the second position the engagement member is positioned within the line of draw of the movable mold portion.
In a further aspect of the disclosure the first mold portion is an outer mold portion and the second mold portion is an inner mold portion. The outer mold portion is preferably the movable mold portion.
In a further aspect of the disclosure, a molded retainer for centrally supporting a wick within a dispensing device is deferred and includes a coupling sleeve molded from a plastic material. The coupling sleeve includes one or more sidewalls. The sidewalls have an outer surface dimensioned to be engaged within the support opening. The coupling sleeve includes an axial opening formed about a central axis and at least one engagement opening is formed in the sidewall, substantially transverse to the axial opening. The molded retainer also includes a wick engagement member positioned within the engagement opening and integrally formed with the coupling sleeve. The wick engagement member pivotably connects to the sidewall and is moveable between a first position and a second position. In the first position, at least a portion of the wick engagement member is positioned within the axial opening for engagement with the wick and, in second position, the wick engagement member is pivoted away from the axial opening. When the coupling sleeve is positioned within the support opening of the dispensing device, the wick engagement member pivots from the second position to the first position.
In a further aspect of the disclosure, the molded retainer includes a substantially cylindrical bore within the coupling sleeve. The coupling sleeve is co-axially formed about the central axis of the axial opening and is substantially cylindrical. The diameter of the outer surface of the coupling sleeve may vary along the length of the sleeve and preferably tapers toward a first end. The coupling sleeve may also have a retaining ring defining a shoulder of the outer surface. The retaining ring may be positioned at the second end of the coupling sleeve and may engage the dispensing device, when the coupling sleeve is positioned within the support opening.
In a further aspect of the disclosure, the engagement member is substantially triangular in form, with a first corner of the triangle defining a pivot connection between the engagement member and the coupling sleeve and a second corner of the triangle creating a projection for engagement of the wick. A plurality of engagement members may be integrally formed with the coupling sleeve and each pivotably attached to the sidewall within separate engagement openings.
Other features of the present invention will become apparent from the detailed description to follow, taken in conjunction with the accompanying drawings.
For the purpose of illustrating the invention, there is shown in the drawings one or more forms that are presently preferred; it being understood that the invention is not limited to the precise arrangements and instrumentalities shown.
In the figures, where like numerals identify like elements, there is shown an embodiment of a molded retainer device preferably formed by injection molding.
Although
It is contemplated that any number of sidewalls may be used such that any shape cross section for the outer surface of the retainer body as viewed from the top and/or bottom is possible. It is further understood that the cross-sectional shape of the outer surface of the retainer body does not have to be uniform along the entire length of the molded retainer. The retainer body 20 may also have a retaining ring 32 located at the outer surface 24 of the retainer body 20 at a second end 34, defining a shoulder 36. The retaining ring 32 may engage with the top 40 of the dispensing device 14 when the molded retainer 10 is positioned within the support opening 42 of the dispensing device 14. The shape of the retaining ring 32 is preferably consistent with the shape of the retainer body 20, but consistency is not required and any shape retaining ring is understood.
The sidewall(s) 22 forms an axial opening 30 about a central axis 26. In a preferred embodiment the axial opening 30 defines a cylindrical bore 38 within the retainer body 20. The diameter of the cylindrical bore 38 remains relatively constant throughout the entire length of the retainer body 20. Although a cylinder is preferred, any shape cross section for the bore 38 as viewed from the top or bottom is contemplated. It is further understood that the cross-sectional shape of the bore does not have to be uniform for the entire length of the molded retainer 10 and also does not have to have the same cross-sectional shape as the outer surface 24 of the retainer body 20. The cylindrical bore, as well as the retainer body 20 are co-axially formed about the central axis 26 of the axial opening 30.
One or more engagement opening(s) 44 are formed in the one or more sidewall(s) 22 and are positioned substantially transverse to the axial opening 30. In a preferred embodiment, three engagement openings 44 may be located equidistant from each other around the upper portion 46 of the sidewall 22. At least one engagement member 16 is integrally formed with the retainer body 20 and pivotably connected to the sidewall 22. The engagement member 16 is formed within the engagement opening 44. A preferred embodiment may have three engagement members 16, respectively formed within three preferred engagement openings 44. The use of a single engagement opening 44 and engagement member 16 is also contemplated as well as a plurality of engagement openings and members up to the amount that is capable of being located around the circumference of the retainer body 20. More than one engagement member 16 may also be located in a single engagement opening 44. Additionally, one engagement opening 44 containing an engagement member 16 may be located at the same height along the length of the retainer body 20 as another engagement opening 44.
The engagement member 16 has a preferable triangular shape although any shape may be provided. A first portion of the member is integrally formed with the retainer body 20 at a living hinge 54 or the like and a second portion formed to engage an article within the bore 38. The preferred triangular shape may have a first corner 48, a second corner 50 and a third corner 52. The first corner 48 preferably forms a connection with the retainer body 20. The second corner 50 preferably forms the projection to secure an article within the bore 38 of the molded retainer 10. The connection between the first corner 48 and the retainer body 20 forms the hinge 54 and is integrally molded with the retainer body 20. The hinge 54 is configured to allow the engagement member 16 to pivot between a first position and a second position, with the first position corresponding to a molded and/or engaged position.
Specifically,
In the second position the second corner 50 may prevent further movement of the engagement member 16 towards the outside of the retainer body 20. The dimension of the engagement member 16 and the engagement opening 44 may cause the second corner 50 to contact the retaining ring 32 at the top 56 of the engagement opening 44 when in the second position. In the second position, the majority of the weight of the engagement member 16 may be located outside of the retainer body 20. Therefore, the contact between the second corner 50 and the retaining ring 32 may stop any further rotation about the living hinge 54 that may be caused by gravity or other force. Movement of the engagement member 16 past a certain point could inhibit the ability of the user to insert the molded retainer 10 into a support structure. A full range of rotation about the hinge 54 is contemplated. The second corner 50 does not need to provide a stoppage function. In which case the engagement member 16 may fully rotate about the living hinge 54 and the third corner 52 of the engagement member 16 may contact the outer surface 24 of the retainer body 20 in the second position.
The molded retainer 10 is provided in the position shown in
Once the wick 12 is inserted, the retainer 10 is inserted into the support opening 42 of the dispenser 14, as shown in
The outer mold portion 70 is provided having a mold opening 78. The inner surface 80 of the mold opening creates the outer periphery of the molded retainer. The specific surface contour of the inner surface 80 of the outer mold opening 70 creates the shape of the sidewalls of the molded retainer. Specifically, the surface contour of the outer mold opening 70 is shaped such that the outer mold portion 70 is removable from the formed product along a line of draw 74, which extends along the central axis 26.
In a preferred embodiment, the mold opening 78 is cylindrical in shape, resulting in a cylindrically shaped molded retainer. The mold opening 78 may also have a cross-sectional diameter as measured along a line perpendicular to the central axis 26 that varies with the depth from the top of the opening 82. Preferably, the diameter of the mold opening 78 decreases as the depth from the top 82 of the mold opening 78 increases. The decreasing diameter for the mold opening 78 permits the outer mold portion 70 to be removable from the molded retainer along the line of draw 74.
A second inner mold portion 72 is also provided. The inner mold portion 72 is shaped to act as the male coupling piece and fit within the mold opening 78 of the outer mold portion 70 to define the cavity 76 there between. The mold cavity 76 defines the retainer body. The retainer body being defined by one or more sidewalls. The mold cavity 76 also defines the engagement openings located in the sidewall of the molded retainer. The inside surface of the sidewalls is created from the contour of the outer surface 84 of the inner mold portion 72. The inner mold portion 72 defines an axial opening within the molded retainer, as well as a bore located substantially about the central axis 26 of the molded retainer. The inner mold portion 72 is preferably cylindrical in shape, which results in creating a preferable cylindrically-shaped bore within the molded retainer. The diameter of the inner mold may remain substantially constant along its lower portion 86, such that the diameter of the lower portion of the bore within the molded retainer is substantially constant.
Indentations 88 within the outer surface 84 of the inner mold 72 create the openings 90 in the mold cavity 76 that define at least one engagement member 16 located in a first position. The openings 90 may be made such that the engagement member 16 is integrally formed with the retainer body 20 and pivotably connected about a living hinge 54 within an engagement opening 44 located within the retainer body 20. The openings 90 are preferably triangular in shape, with a first corner 48 of the triangle being the location of the living hinge 54 connection. With the engagement member in the first position, as molded, the second corner 50 extends within the axial opening, which during the molding process is located within the inner mold portion 72 and is defined by the indentation 88. The location of the engagement member 16 in this position prevents the inner mold portion 72 from being removed along the line of draw 74 while the outer mold portion 70 is still in position around the inner mold portion 72.
For creating the molded product, the inner mold portion 72 is inserted within the mold opening 78 in the outer mold portion 70 along the line of draw 74. The bottom of the inner mold portion 92 contacts the bottom of the mold opening 94 in the outer mold portion 70, such that the bore within the molded retainer will be open at both the top and the bottom. Once the mold portions 70 and 72 are aligned with each other, a molten plastic or other liquid molding material is injected into the cavity 76. A standard injection molding process along with any known molding material may be used to create the molded retainer 10, including both metals and plastics. The molten material, preferably plastic, is allowed to cool and solidify prior to moving either mold portion 70 or 72.
As discussed above, the mold cavity 76 creates the engagement member 16 in the first position as integrally formed with the retainer body 20. The molded first position 96 of the engagement member 16 is preferably slightly opened, such that in use, the engagement member 16 may close more fully creating a more secure hold. The engagement member 16 is located within the inner mold portion 72 such that the inner mold portion 72 cannot be removed immediately after the molding process is complete and the molded retainer 10 is solidified. To remove the molded retainer 10 from the mold portions 70 and 72 a two step process is used.
As an initial step, the movable mold portion, which in this embodiment included in the figures is the outer mold portion 70, is removed along the line of draw 74. The outer mold portion 70 does not have any restrictions to its movement along this line. Once the movable mold portion is removed, the molded retainer 10 is ejected from the other mold portion 72 along the same line of draw 74. As the molded retainer 10 is ejected, the engagement member 16 is pivoted from the first position 96 to a second position 98. The second position 98 is located within the line of draw 74 of the moveable mold portion.
Although the preferred embodiment described herein shows the molding process forming the molded retainer having engagement members in the first position. It is also contemplated that the engagement members may be molded in the second position and moved to the first position by the ejection step. In a preferable configuration for this positioning, the pivot point of the engagement member is moved from the bottom outside corner to the top outside corner of the triangle. The inner mold may be removed first, followed by ejection of the molded retainer from the outer mold portion. When the molded retainer is ejected along the line of draw, the engagement members are moved from the second position with a portion located on the outside of the axial opening to the first position with a portion located on the inside of the axial opening. In this embodiment, the retainer secures structures on its outside surface.
The present disclosure shows and describes one or more exemplary embodiments. It should be understood by those skilled in the art from the foregoing that various other changes, omissions and additions may be made therein, without departing from the spirit and scope of the contemplated invention, with the scope of the invention being defined by the foregoing claims. Further, the terms herein are used in a generic and descriptive sense and are not necessarily for purposes of limitation. The scope of the invention is set forth in the following claims.
