Abstract:
An attachment device for the attachment of two members, and is particularly envisaged for the attachment of objects to a post, bar, rod, wire, rope or the like. The device has two arms at one end that encompass the perimeter of the post, and pressure elements are provided to apply pressure to the post, to grip it securely. The device preferably includes a substantially cylindrical device having two threaded arms that encompass the post, with a nut being screwed to the thread to enable the device to grip the post, with the other end of the device being adapted in various ways to hold different objects.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to an attachment device, namely for the attachment of two members, and particularly being the means for mutual attachment of objects to posts, bars, rods, wires, ropes, or the like. 
     At present, attachment of objects to a post or similar is achieved by slipping a conventional clamp over one end of the post, by using a ring clamp tightened by a screw, by using a double C-clamp, that uses screws to grip both the post and the object, or simply by tying a piece of string around both the post and the object. 
     A conventional clamp that slides over the end of a post cannot be used on a closed post, unless it is pre-attached to the post during construction of the object of which the post is part. 
     For a ring clamp to be of use, it has to have a pre-designed integrally molded part adapted to grip the object to be attached. 
     A double C-clamp has the disadvantage of being post-specific, and not adaptable for posts of varying sizes. 
     It is therefore an object of the present invention to provide attachment means for attaching objects to a post, wherein said means is adapted for use on a closed post; said means is adapted to provide a strong grip; said means is adapted to attach and detach both readily and repeatedly; no preparation of the post is required; and said means is adapted for use for a wide variety of purposes. 
     BRIEF SUMMARY OF THE INVENTION 
     In accordance with the present invention, there is provided an attachment device for mutual attachment of two members. One end of the body of the device is a base which can be adapted in various ways for the attachment of a first member, and the other end has a form substantially of two arms formed by a slot in the basic shape such that the whole perimeter of a second member can be encompassed within the device. 
     Said arms are adapted to receive means for applying pressure to urge the second member towards the base. 
     In a preferred embodiment, the attachment device is used to attach an object to a post, bar, rod, wire, rope or the like. 
     Said arms are preferably threaded in order to receive said means for applying pressure, which could be a nut or equivalent tightening means able to engage the thread in a well known manner. 
     In use, in a cross-section in the plane perpendicular to the axis of a gripped upright, the slot can have a shape defined by angled sidewalls inclined towards the longitudinal axis of the body, said walls together forming substantially a “V” shape 
     The shape of the slot can be further defined by a bottom wall which is parallel to the base of the device. 
     The shape of the slot can also incorporate a portion comprising walls parallel to the longitudinal axis of the body, in combination with either said angled sidewalls, or said bottom wall, or both. 
     Also in accordance with the present invention, there is provided a device wherein said pressure applying means is held at a fixed position. 
     The pressure applying means can be held in said fixed position by provision of stops or clips on the outer surface of the body of the device. 
     Also in accordance with the present invention there is provided a device incorporating a portion extending away from the main body of the device, and a horizontal pivot pin mounted on said portion at a location spaced, in use from a second member gripped in the device, the pivot pin being adapted to receive a bolt which, when bolted through an object, acts as a vertical pivot pin for the object, the two pins providing a universal joint. 
     This form of the invention is preferably used in the case where the object gripped is a frame member of a bicycle, and the second member is a leading arm of a trailer. 
     Also according to the present invention there is provided a device wherein the base has embedded therein a screw, the head of said screw protruding from the bottom wall of the slot so as to be easily accessed by a screwdriver or other screw tightening means. The surface penetration end of the screw protrudes outwith the body of the device so that said screw can be used to attach the device to any surface into which said screw is capable of being driven. 
     Also according to the present invention there is provided a device joined together base to base with another device, either by a pivoting arrangement, or as one piece, so as to provide means for joining two posts or similar. 
     Embodiments of the invention will now be described by way of example only, with reference to the drawings. 
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
     FIG. 1 is a cross-sectional view of one embodiment of the invention in the form of a basic device; 
     FIG. 2 is a perspective view of the device of FIG. 1; 
     FIG. 3 is a side view of the device of FIG. 1; 
     FIG. 4 is a perspective view of a pivoted double lock forming a second embodiment of the invention; 
     FIG. 5 shows a one piece double lock; 
     FIG. 6 shows an embodiment of the invention having an embedded screw; 
     FIG. 7 shows an embodiment of the invention that itself forms the head of a screw; 
     FIG. 8 shows an embodiment of the invention with a spike on the bottom edge of the slot; 
     FIG. 9 shows an embodiment of the invention with an attached plate, adapted to receive fasteners; 
     FIG. 10 shows a plastic embodiment of the invention with a peel-off sticky back; 
     FIG. 11 shows an embodiment of the invention with attachment platform; 
     FIG. 12 shows an embodiment of the invention with a chamfered nut; 
     FIG. 13 shows an embodiment of the invention constructed from a hollow tube for use in a trailer linkage system; 
     FIG. 14 is a cross section of the base of the device of FIG. 13; 
     FIG. 15 shows a further embodiment of the invention; And 
     FIG. 16 shows a further embodiment of the invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     FIGS. 1 to  3  illustrate a preferred embodiment of the invention, wherein the device is adapted for use for attachment of various objects (the first member) to a post, bar, rod, wire, rope, or the like (the second member). The device  1  has a substantially cylindrical body, with a large slot  2  cut out of it, effectively forming two arms  3  at one end. These arms  3  are threaded in order to receive a nut  4  or similar. 
     The slot  2  has a first portion having parallel edges  7  forming the arms  3 , and a second portion further in to the body of the device  1 , having angled edges  8  angled towards the body axis  10  of the cylinder that defines the body of the device  1 ; and a third portion having a bottom edge  9  that is parallel to the base  5  of the device  1 . The angled edges  8  and the bottom edge  9  of the slot  2  form a “V” shape, namely a tapered slot that may have a bottom edge; that, together with the nut  4  when attached, grips the second member  6  at at least three points. 
     The open end of the device  1  is then simply placed round the second member  6 , and the nut  4  is secured by engaging it with the threaded arms  3 , in a well-known manner. This can be done by hand, making it easy to attach and detach the device  1  from a second member  6 , or the nut could be tightened with tools such as a spanner or tommy bar. It will be appreciated that the threaded arms  3  could be engaged to grip the second member  6  by means other than a standard nut, for example with a large wing nut. 
     The base  5  of the device is adapted to receive a second member or to be attached to the desired first member in any convenient way, examples of which are described below. 
     FIG. 4 illustrates a second embodiment, wherein a double lock  11  is provided, comprising two devices being connected by a pivot pin  12 . This embodiment can be used for connecting and securing in place adjacent pieces of scaffolding or other such apparatus. 
     FIG. 5 illustrates a third embodiment, wherein a single piece double lock  21  is provided for the purpose of connecting and securing in place adjacent pieces of scaffolding or other such apparatus. This embodiment of the invention can be supplied with the two ends at different angles as required. 
     FIG. 6 illustrates a fourth embodiment, wherein a screw  32  is embedded into the base of the device  1 . The head of the screw  32  protrudes from the bottom edge  9  of the slot  2 , so that it can be accessed by a screwdriver (not shown) or other such means of turning the screw  32 , and the surface penetration end of the screw  32  extends outwith the body of the device  1  so that the device  1  can be attached to any surface which a screw can be driven into, particularly a substantially planar surface such as, for example, a poster or sign, before being attached to a second member  6 . 
     FIG. 7 illustrates a fifth embodiment, wherein the device  1  itself forms the head of a screw, for similar purposes as the fourth embodiment. 
     FIG. 8 illustrates a sixth embodiment, wherein the bottom edge  9  of the slot  2  has formed thereupon a spike  52  to create a hole in a second member  6 . This can be used to extract or inject gases or liquids, or to increase the security of the device  1 . The spike  52  could also be adapted to act as a sensor. 
     FIG. 9 illustrates a seventh embodiment, wherein a plate  62  is supplied that facilitates the use of a number of fasteners (not shown) to attach the device to a wall or similar. For example, the plate  62  could have a number of holes designed to accommodate screws, bolts, or other such attachment means. 
     FIG. 10 illustrates an eighth embodiment, which is a device  1  constructed from plastic, provided with a sticky back pad  72  for the attachment of objects, used for light applications. 
     FIG. 11 illustrates a ninth embodiment, wherein a special connecting piece  82  is provided. The outer platform  83  can rotate within the device  1  until a second member  6  is clamped in, upon which the inner platform  84  is forced against the body of the device  1 , holding the outer platform  83  at a set position. The outer platform is raised so as to sit slightly above the base  5  of the device  1 , enabling objects to lock onto it. The outer platform  83  can be of various shapes, and can be threaded or otherwise adapted in a known manner to attach various devices, such as bicycle lights. 
     FIG. 12 illustrates a tenth embodiment, wherein the nut  94  of the device  1  is provided with a chamfer  95 , so that, when used with a recessed bar  97 , gives added security. 
     FIGS. 13 and 14 show the device  1  in a particularly preferred use—in a trailer linkage system for a bicycle or motorcycle, wherein the device  1  is used to attach a seat post  106  of said bicycle or frame of said motorcycle to the leading arm  105  of a trailer. 
     The base of the device  1  takes the form of a hollow tube  102 , which is cut away at the end in a manner such as that illustrated in FIG. 13. A horizontal pivot  103  is provided through the tube  102 . A bolt  104  can be attached through a vertical hole in the leading arm  105  of the trailer to the horizontal pivot  103 , thus forming a vertical pivot for the trailer. 
     These two pivots in combination provide a simple and cheap universal joint. As the device is itself part of the universal joint, the pivots are close to the seat post  106 , thus minimising or at least reducing the forces in the attachment to the seat post  106 , ensuring that a strong grip is provided while using a relatively light construction for the device. 
     As the vertical pivot has an axis which is fixed perpendicularly with respect to the trailer, the angle of lean is equal on the bicycle and the trailer, thus ensuring correct steering geometry upon cornering. 
     The trailer linkage can be removed simply by removal of either the nut  4  from the device  1 , or the bolt  104  from the leading arm  105  of the trailer, and can then be easily used on other trailers and bicycles or motorcycles. 
     FIG. 15 illustrates an embodiment of the invention, wherein the pressure applying means is held at a fixed point. It shows a device  111  having a substantially cylindrical body and threaded arms, wherein stops  117  are provided on the outer surface of the body of the device, so that the nut  114  is held at a certain position. This embodiment is appropriate for use in situations where a firm grip is not required, for example holding curtain rails, or holding spotlights on a rail such that the spotlights can be movable along the said rail. 
     FIG. 16 illustrates an embodiment of the invention having a body with rectangular cross-section, wherein the pressure applying means is held in a manner alternative to a screw thread. It shows a device  121 , having a body with rectangular cross-section. A collar  124  is held in position by clips  127  on the arms  123 . 
     Embodiments of the invention provide the following features and advantages over the prior art: 
     The device is preferably constructed from a suitable metal or alloy, though for lighter applications, a plastic embodiment could be employed, as shown, for example in FIG. 10 or FIG.  16 . 
     In situations where the second member is fragile, for example if the device is being used to attach an object to a rope, a shim can be employed between the nut and the second member to protect the second member. Suitable surfaces could be adhered to the surfaces of the slot or the nut to provide required friction and/or protection properties. 
     An object can be attached quickly, easily, repeatedly and firmly to any point of a second member without the need to use tools, or to pre-prepare the second member. The device can also be used to attach a second member having an irregular or unpredictable shape. The device can be fitted to second members with closed ends, and one device will fit a range of sizes of second members. Devices can be supplied with different strengths of grip by using different angles in the “V”, different thread pitches, or different surfaces in the “V” itself. The device can be secured by means of a lock nut or a split pin, or a padlock going through a hole in the threaded section. 
     It will be understood that the alternative forms of the base end of the device are not limited to the forms disclosed herein, and other forms serving different purposes may be incorporated into the device without departing from the scope of the invention.