Patent Application
20110140379
The application relates generally to the field of assembled articles and more specifically to a coupling assembly for assembled articles, such as a supporting pole assembly for a medical mobile stand.
Many articles are shipped to their end destinations in a fully assembled condition. Shipping containers for these articles therefore must be quite large; particularly for assemblies that are defined by relatively long or bulky portions. To ease shipability, some articles are transported in component or part form wherein final assembly is completed by an end user. Certain of these articles, such as stands and the like that include posts or poles among their component parts, are among such assemblies that could be shipped in a partially assembled state. In some versions, these poles are made to be telescopic to aid in assembly or in permitting adjustability using a smaller initial footprint. A competing issue exists, however, in that some assemblies may also have stability requirements. It is still a desire to be able to ship or initially store such articles in order to decrease the size of their respective shipping container, but yet permit dependable secure assembly of the discrete components, for example, in a permanent structure.
Therefore and according to one aspect, there is provided a support assembly comprising a pair of interlocking pole members; namely, a first pole member having a hollow end with a female spline disposed therein for mating engagement with a male spline formed at the end of a second pole member. The engaging teeth of the male and female splines combine to define an interface that directly and permanently engages the pole members and minimizes lateral play. In one version, the teeth are angled to create an interference fit.
In one version, the hollow end of the first pole member includes a contoured mating hole sized to receive an extending portion of the second pole member.
In another version, a concave washer with a serrated edge or other locking element engages the hollow end of said first pole member when the second pole member is inserted a predetermined distance into the hollow end of the first pole member.
According to one version, the teeth and the slots of the respective splines are tapered but in which the teeth of the male spline are larger than the corresponding tapered slots of the female spline, thereby producing line contact and a stable and secure interconnection.
According to another aspect, there is provided a mobile stand, said mobile stand comprising a wheeled base and a vertically extending pole member in which each of the pole member and wheeled base are interconnected, the pole member having a first spline and the wheeled base having an extending mating section that includes a second spline. The first and second splines interface to form a permanent connection. The vertically extending pole member can be made from two or more separate and interlocking sections, each of the interlocking sections being defined by respective mating ends.
The interlocking sections are defined by a first pole section having a hollow end with a female spline disposed therein for mating engagement with a male spline formed at the end of a second pole section. The engaging teeth of the male and female splines combine to define an interface that directly and permanently engages the pole sections and minimizes lateral play. In one version, the teeth are angled to create an interference fit.
According to yet another aspect, there is described a method for manufacturing a pole assembly, said method including the steps of providing a first pole section with a hollow first end having a first spline, providing a second pole section having a first end and providing a second spline complementary to said first spline at said end. One of said splines of the first and second poles includes a plurality of axial teeth and the other of said splines includes a plurality of slots, each of said slots being sized to receive said teeth in an interference fit.
An advantage is that sturdy, stable and reliable assembly is made possible using the herein described stand, while still permitting portions thereof to be shipped as component parts.
Another advantage is that the assembly process is relatively easy, while still being permanent and secure.
These and other features and advantages will be readily apparent from the following Detailed Description, which should be read in conjunction with the accompanying drawings.
The following description relates to an exemplary mobile stand depicting salient features of the present invention. More specifically, the mobile stand includes a pole assembly made in accordance with the inventive concepts defined herein. It will be readily apparent, however, that various modifications and/or changes could be made within the intended scope of the concepts that are described herein. In addition, certain terms such as “upper”, “lower”, “distal”, “proximal”, “above”, “below” and the like are used throughout the course of this description in order to provide a convenient frame of reference with regard to the accompanying drawings. These terms, however, are merely intended to provide clarity and not to narrow the scope of the claimed invention, except where so specifically indicated.
Referring to
A medical instrument, such as a vital signs monitoring device 44, (such as a SPOT ULTRA monitoring device sold by Welch Allyn, Inc. of Skaneateles Falls, N.Y.), is attached by known means to the upper end of the upper pole section 38 in addition to other hardware, including a support basket 48. The herein shown vital signs monitoring device 44 is configured to measure various physiological parameters of a patient (not shown) including, but not limited to body temperature, blood pressure, respiration, pulse rate and blood oxygen saturation (pulse oximetry). Other instruments/devices can be used depending on the application, wherein the instrument shown is herein intended to be merely exemplary. The support basket 48 is secured to the upper pole section 38 by means of a bracket 52, which is attached to the exterior of the upper pole section by a set of fasteners 56 or other convenient means. Alternatively, the support basket 48 could be made integral with the upper pole member 38. The support basket 48 according to this embodiment is used to conveniently store accessories (not shown) for the attached monitoring device 44, such as thermometry probe covers, inflatable blood pressure cuffs and the like. Other suitable storage or securing means such as hooks can also be provided, depending on, for example, the instrument and application of the mobile stand 20.
The mating interface of the two interlocking pole sections 34, 38 of the pole member 30 according to this exemplary embodiment is now described in greater detail with reference to
According to this embodiment, the upper end of the lower pole section 34 is hollow and includes a contoured female mating hole or opening 60, which further includes an insert section 64, the diameter of the mating hole being narrowed at a lower end 68 of the insert section. A female spline 72 is formed within an axial portion of the insert section 64 proximate the opening 60. The female spline 72 is defined by a series of axially extending slots 74 disposed about the inner circumference of the insert section 64 proximate the hollow upper end of the lower pole section 34. Each of the slots 74 taper inwardly from a larger width dimension adjacent the opening 60 to a narrower width dimension at a bottom end. Each slot 74 is bounded by a sidewall projecting radially from the spline 72, the slots being separated from one another by annular sections 77.
Still referring to
Coextensive with the lower end of the upper pole section 38 is an extending cylindrical section 88 that is distally arranged relative to the male spline 80. The extending cylindrical section 88 extends over an axial section of the pole section 38 and has a diameter that is narrower than the outer diameter of either spline 72, 80. The cylindrical section 88 includes a distal section having a center opening (not shown), aligned along the primary axis of the pole section 38. This center opening according to this embodiment is threaded and configured to receive a fastener 96. The fastener 96 is used to secure a locking washer 92 to the distal end section of the upper pole section 38. The locking washer 92 is defined by a concave shape, including a plurality of serrated portions 98 that are circumferentially disposed.
When the lower and upper pole sections 34, 38 are assembled together as shown in
The foregoing interface between the engaging splines 72, 80 of the engaged pole sections limits lateral play as well as radial motion between the mating upper and lower pole sections 34, 38. In addition, a diametrical interface is provided between the extending cylindrical portion 88 and the mating hole 66 distal to the splines 72, 80 that further limits lateral play between the two pole sections 34, 38.
In addition, the locking washer 92 further acts to engage the upper and lower pole sections 34, 38 together in a locking relationship. As noted, the locking washer 92 is affixed to the distal neck or end of the upper pole section 38 by means of a fastener 96, such as a screw, bolt or other threaded fastener. The orientation of the locking washer 92 is such that the insertion of the upper pole section 38 into the mating hole 60 of the lower pole section 34 is unidirectional. The diameter of the locking washer 92 is greater than the narrowed diameter of mating hole 68 and therefore the sharp edges of the serrated sections 98 penetrate the inner diametrical wall of the insert portion 64 as the upper pole section 38 is axially inserted into the lower pole section 34. The natural concave shape of the locking washer 92 prevents removal from the lower pole section 34, thereby preventing the mating pole sections 34, 38 from being separated and permanently locking them in direct engagement.
Referring to
According to this exemplary embodiment, the wheeled base 24 includes a hollowed vertically extending shaft 102 that is provided within the center stanchion 29 of the base. This shaft is defined by a mating hole or opening 106 that is sized to receive the lower end of the lower pole section 34, the shaft further including a complementary female spline 110. The opening 106 of the extending shaft 102 is contoured and is defined by a diameter that decreases or narrows in relation to the open end thereof. Preferably, the male spline 80 includes a set of axially extending teeth 84 that are tapered along their length, like those previously discussed and shown in
It will be readily apparent that other modifications and variations are possible that include the inventive concepts according to this application. For example, it should be noted that the splines could be reversibly located; that is, the male spline could be situated on the lower pole section and the female spline situated along the upper pole section of the pole member.
