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Height adjustable headrest deviceHeight adjustable headrest device description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080018159, Height adjustable headrest device. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] The invention relates to a height adjustable headrest device as well as a wheel chair with such a height adjustable headrest device. BACKGROUND OF THE INVENTION [0002] Height adjustable headrest devices are known from prior art. They are used, among others, with seats in the medical field as well as in the field of care, for example also in wheel chairs. A shower and toilet wheel chair with a height adjustable headrest is distributed under the product name OCEAN VIP by the AQUATEC GmbH, Alemannenstr. 10, 88316 Isny, Germany. [0003] The height adjustable headrest device of this known shower and toilet wheel chair will be described below in connection with FIGS. 7 to 11. It is to be understood that the representations in the figures of this application including said FIGS. 7 to 10 are not drawn to scale. For a better representation of certain details, the representation of some components is enlarged and simplified. [0004] FIG. 7 shows a known height adjustable headrest device 200 in a perspective representation. The device comprises a headrest 201 which is fixed to a horizontal bar 202. The headrest can be shifted horizontally by releasing a clamping device 203 whereby the horizontal bar 202 can be shifted along the shorter shank 204A of a headrest supporting element 204 designed in the shape of a J. [0005] The headrest supporting element 204 is fixed to a crossbar element 210 by means of a clamp connection 300. The crossbar element 210 can, for example, be the central part of a push handle of a wheel chair. [0006] The clamp connection 300 is shown in FIG. 8 in a perspective representation and in FIG. 10 in a side view, in each case partially cut open, where in each case only a part of the headrest supporting element 204 as well as the crossbar element 210 is shown. [0007] The clamp connection 300 comprises a U-shaped retaining clamp 360 having two rectangular recesses 361A, 361B, through which the headrest supporting element 204, which also has a rectangular design, can be inserted. The internal radius of the retaining clamp 360 having a U-shaped design is dimensioned such that it is adapted to the outside diameter of the crossbar element 210. Between the crossbar element 210 and the headrest supporting element 204, a spacer 370 is arranged which is held in the retaining clamp 360 by means of a groove and tongue connection so as to be shifted. The corresponding grooves 362A and 362B of the retaining clamp 360 are shown in FIG. 9. [0008] A tapped bore 380 is provided in the retaining clamp 360 in which a screw element 390 is screwed in. [0009] The screw element 390 is provided with a star handle 391 which permits manual release and tightening of the clamp connection 300. [0010] The function of the known clamp connection will be illustrated below. As is in particular represented in FIGS. 8 and 10, the retaining clamp 360 is placed around the crossbar element 210 such that the tapped bore 380 is flush with a bore 211 provided in the crossbar element 210. Opposite the bore 211, a bulging 212 concave to the inner surface is provided in the crossbar element 210. [0011] The spacer 370 is inserted into the retaining clamp 360 and the headrest supporting element 204 is inserted through the recesses 361A, 361B of the retaining clamp 360. The screw element 390 is screwed into the tapped bore 380 and in the process inserted through the bore 211 of the bar element 210 until it lies against the bulging 212. When the screw element 390 is further screwed in, the retaining clamp 360 is moved to the right with respect to the bar element 210 in FIG. 10, which causes the headrest supporting element 204 to be pressed against the spacer 370 and the spacer 370 to be pressed against the crossbar element 210. Thereby, a clamp connection is formed which provides secure positioning of the headrest supporting element 204 with respect to the crossbar element 210. [0012] If the screw element 390 is slightly screwed out of the retaining clamp 360, the clamp connection is released and the headrest supporting element 204 can be shifted in the longitudinal direction with respect to the retaining clamp 360 and thus with respect to the crossbar element 210. Thus, a continuously variable height adjustment of the headrest 201 is achieved. SUMMARY OF THE INVENTION [0013] One aspect of the invention is to further improve the known height adjustable headrest device, in particular with respect to function and operating safety. [0014] The invention provides a height adjustable headrest device with a crossbar element and a headrest supporting element as well as a clamp connection for the continuously variable mounting of the headrest supporting element at the crossbar element, wherein the clamp connection comprises a retaining clamp comprising two recesses as well as a tapped bore, the retaining clamp gripping around the crossbar element, a centering bushing comprising an external thread and an internal thread, the centering bushing being screwed into the tapped bore of the retaining clamp, and a screw element screwed into the centering bushing, wherein the headrest supporting element is inserted in the recesses of the retaining clamp, the crossbar element comprises a bore into which the centering bushing is inserted, and the clamp connection is effected by screwing in the screw element into the centering bushing and thus bringing the headrest supporting element near the crossbar element. [0015] The height adjustable headrest device according to the invention thus differs from the known height adjustable headrest device illustrated above in the design of the clamp connection, that is in that a centering bushing is provided which comprises an external thread and an internal thread. The centering bushing is screwed into the tapped bore of the retaining clamp with its external thread. With a cylindrical centering section, the centering bushing is inserted in a correspondingly designed bore of the crossbar element. The screw element is screwed with the clamp connection by means of the internal thread of the centering bushing. [0016] By the provision of the centering bushing, a particularly exact holding and fixing of the components with respect to one another is ensured. [0017] In a preferred embodiment of the invention, the sense of rotation of the internal thread of the centering bushing is opposed to that of the external thread of the centering bushing. If, for example, the internal thread is designed as left-handed thread, the external thread is designed as right-handed thread. This prevents the threaded bushing from being screwed out of the retaining clamp when the screw element is unintentionally actuated. [0018] Preferably, a spacer is arranged between the headrest supporting element and the crossbar element and held via a groove and tongue connection in the retaining clamp in a preferred embodiment. The spacer is preferably made of plastics to ensure clamping as wear-resistant and backlash-free as possible. [0019] The crossbar element preferably has a tubular design. In the crossbar element, opposite the bore for receiving the centering bushing, preferably a bulging which is concave to the inside is provided which acts as abutment for the screw element. [0020] The headrest supporting element and the corresponding recesses of the retaining clamp preferably have a rectangular design. It is to be understood that other shapes, for example circular or other rounded geometries, are also possible. [0021] A wheel chair according to the invention with a height adjustable headrest device according to the present invention is preferably designed such that the crossbar element is designed as a push handle. Continue reading about Height adjustable headrest device... Full patent description for Height adjustable headrest device Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Height adjustable headrest device patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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