Abstract:
A lockable toggle joint (4,5) for a cycle rack with pair of scissor shaped branches (2, 3) and scissor joint (7, 71, 72) comprising suitably shaped holding means (8A, 5 8B) for the holding of the rack to a conventional trailer ball hitch (1) at the rear of an autombile and carrying means (2A, 3A) for the bicycles comprises snaplock and interlock means (6) which is lockable.

Description:
FIELD OF THE INVENTION 
     The present invention relates to a cycle rack including a lockable toggle joint providing a mutually tensioned spacing between two longitudinally extending branches of a pair of holding means for holding at least one bicycle during transportation thereof, with the cycle rack being arranged above a trailer ball hitch means of an automobile, and with the toggle joint including at least two toggle levers pivotable around a common hinge joint and mutually pivotable with respect to joining branches which, at their opposite ends, are each connected to one of the two longitudinally extending branches of the holding means. 
     SUMMARY OF THE INVENTION 
     The present invention relates to a cycle rack employing a toggle joint arrangement, with the cycle rack including a fork shaped holding means capable, with sufficient force, to safely hold at least one bicycle onto an above a commonly used trailer ball hitch provided at the rear of an automobile for pulling a trailer or caravan behind the automobile, when the automobile is used without any trailer or caravan, in which case, the ball shaped hitch means is present as a free element, i.e., non-used element, on the rear of the automobile. 
     The purpose of the invention is to provide a comparatively inexpensive and easily manufactured holding means capable, without undue twisting of the two longitudinally extending branches of the holding means, to hold these branches fixed in position onto and preferably, above the ball shaped hitch means, so that, when fixed in position, the two longitudinally extending branches are kept in a fixed position in relation to the automobile. Carrying means for the bicycle in the form of, for example, horizontally rearwardly and upwardly protruding carrying rods or beams are provided on the respective branches. The toggle joint according to the invention may be locked by an attachable locking element so that stealing or unauthorized removal or loosening of the holding means can be prevented. 
     According to the invention, the lockable toggle joint is provided with a first joining branch having an extension thereof provided with a means, such as a bearing portion, able to abut against another means, such as an abutting portion, on the second joining branch located at a spaced distance from a common hinged joint. A third handle-like branch, located at a spaced distance from the common hinged joint is pivotably joined to the extension of the first joining branch and carries at least one snaplock means. The snaplock means are arranged so that the snaplock means, with the first and second joining branches through their pivotal movements being swung to provide the tension spacing of the toggle joint between the two longitudinally extending branches of the holding means, register and interlock, with a receiving snaplock means being located on the first joining branch. 
     To further reduce any twisting of the two longitudinally extending branches, the first and second joining branches each may be composed of two parallel spaced branch elements for providing guiding and non-twisting of the two longitudinally extending branches of the holding means. Embodiments according to the invention may also be provided with the longitudinally extending branches being shaped in one or more bent portions so as to avoid a covering of the view from the rear of the automobile license plates positioned above the ball shaped hook means and which could be covered from view through straight rod-shaped longitudinally extending branches protruding obliquely upwardly from the ball shaped hook means. If the longitudinal branches are given a bent shape, their capability to provide a sufficient stiff holding of the at least one bicycle is reduced, because the branches have to present a greater length and also because the branches may more easily be twisted. Through the application of the invention, this twistability is considerably reduced. 
     Various locking means may be used in connection with the embodiments according to the present invention. Without in any way to be exhaustive some probable embodiments of applicable locking means are described in connection with some exemplified embodiments according to the invention which are described as follows with reference to the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an exploded perspective view of an embodiment according to the invention of a cycle rack to be mounted on a trailer ball hitch, 
     FIG. 2 is an exploded perspective view of another embodiment of a cycle rack according to the invention, 
     FIG. 3 is a perspective view of a partly open toggle joint of the cycle rack according to FIG. 1 or FIG. 2, 
     FIG. 4 is a partial cutaway perspective view of a toggle joint of FIG. 3, and 
     FIG. 5 is a perspective view of a lower portion of the cycle rack of FIGS. 1 or 2 fitted with exchangeable holding means for trailer ball hitches of different sizes. 
    
    
     DETAILED DESCRIPTION 
     Referring now to the drawings wherein like reference numerals are used throughout the various views to designate like parts and, more particularly, to FIG. 1, according to this figure, a trailer ball hitch 1 of the type located on the rear of automobiles for trailing caravans, trailers, etc has a cycle rack constructed in accordance with the present invention mounted on the ball thereof in a tensioned condition. The cycle rack includes branches 2, 3 having lower portions 27, 37 located below a fishplate link connecting means 7 linked to the branches 2, 3 at 71, 72. Annular holding means 8A, 8B are arranged internally between the branches 2, 3 with the annular holding means 8A, 8B being capable, in the illustrated tensioned condition, of clamping the cycle rack to hold the ball hitch 1. Arm means 2A, 3A are provided at the upper ends of the branches 2, 3 to carry the bicycles. 
     A toggle joint is provided between the upper portions of the branches 2, 3, with the toggle joint comprising two toggle branches 4, 5 pivotally connected at 41, 51 to the branches 2, 3. These two toggle branches 4 and 5 share a common link bolt 45 mutually linking the two branches together. The toggle joint, shown in the closed condition in FIG. 1, provides tension between the branches 2 and 3 at 41 and 51 thereby enabling the lower portions of the branches 2, 3 through the annular holding means 8A, 8B, to squeeze the ball hitch 1 between them due to the fishplate arrangement 7, 71, 72 serving as a bearing for the branches 2 and 3. The toggle joint is opened to widen the annular holding means 8A and 8B away from each other by pushing the common link bolt 45 upwards and thereby swinging the toggle joint branches 4, 5 around bearings 41 and 51, making mounting and removal of the cycle rack possible. 
     The toggle joint branches 4, 5 are kept in tensioned condition by a snaplock member 6 located on an extension 5A of the toggle branch 5. 
     As shown most clearly in FIGS. 3 and 4, the snaplock means is pivotably connected to an extension 5A of the toggle joint branch 5 at bearing portion 65. The snaplock member 6 is angular shaped with the link bolt located close to the angular bending of the snaplock member 6. The lower portion, according to FIGS. 3 and 4, of the snaplock member 6 is, at 64, provided with a hooked shaped portion adapted to grip under an abutting portion of the other toggle branch 4 when the two toggle branches 4, 5 are swung to the tensioning position shown in FIGS. 1 and 2. The abutting portion 46 of the toggle branch 4 simultaneously abuts against the material portion of the snap lock member 6 just below the bearing portion 65. By downward pressing on a handle shaped portion 6H of the snaplock member 6, the snaplock member 6 pivots around the bearing portion 65 and disables the hook shaped portion 64 from the abutting portion 46 which makes it possible to push the common link bolts 45 upwards for opening of the toggle joint. 
     In FIG. 4, a spring means 69 provides a pushing force between the snaplock member 6 and a cross member 59 located on the extension 5A of the toggle branch 5 whereby the handle portion 6H is constantly urged upwardly thereby urging the hook shaped portion 64 in a gripping position together with the abutting portion 46 when the toggle joint is in a closed condition. 
     An opening or other interlock means for a padlock or other locking means may be located, for example, at 40, so that the snaplock member is prevented from being moved. The toggle branches 4, 5 and connecting means 7 are illustrated as composed of two parallel arranged branch members which, for example, may be made of flat iron. With such an arrangement, the twisting movements of the snaplock as well as the branches 2, 3 are avoided and a better holding of the cycle rack on the ball hitch 1 is provided. 
     This last feature is essentially important when an embodiment of the cycle rack as the one shown in FIG. 2 of the drawing is used. In FIG. 2, the branches are provided with two bent portions 22, 23 and 32, 33 thus providing an aperture between the branches 2, 3 so that the cycle rack does not cover the view of a license plate positioned at the rear of an automobile above the rear bumper. 
     In FIG. 5, a further development according to the invention is shown through which accommodation of the above mentioned embodiments according to the invention in case of a mounting of the cycle rack to a trailer ball hitch means of different sizes it to be achieved. Thus, in case the holding means 8A, 8B should have another size and thus, for example, should have other diameters of the annular shaped holding means or have different axial lengths of the annular holding means 8A, 8B, or also with possible means being inserted between the holding means 8A, 8B and the longitudinal branch portions 27, 37 or a combination thereof, the embodiment is shown in FIG. 5 may be advantageous. Thus, in FIG. 5, a pair of exchangeable holding means are provided with annular shaped holding means 8A, 8B. 
     To provide an easily performed exchangeability of the holding means according to FIG. 5, different sets of holding means 8A, 8B provided with tube shaped means 9A, 9B may be employed. The tube shaped means 9A, 9B may carry adequate fastening means such as, for example, set screws 9C, 9D or the like, adequately closely fitting around the lower portions 27, 37 of the branches 2, 3. The tube shaped means 9A, 9B may be slid up from below around the lower portions and through the tensioning of the fastening means 9C, 9D be maintained in position thereon. The means 9C, 9D could also be snaplock means, etc.