Patent Application
20120125145
The present invention relates to the field of pivotable handlebar stems, and more specifically to a multi-purpose pivotable handlebar assembly that utilizes a clamping force.
a illustrates a perspective view of an exemplary embodiment of a pivotable handlebar stem apparatus with cam lock locked, positioning component engaged, and handlebars in the riding position.
b illustrates a perspective view of an exemplary embodiment of a pivotable handlebar stem apparatus with cam lock unlocked, positioning component disengaged, and handlebars in the riding position.
c illustrates a perspective view of an exemplary embodiment of a pivotable handlebar stem apparatus with cam lock locked, positioning component engaged, and handlebars in the parked position.
As used herein, the term “clamping force” refers to pressure applied to a clamp body that secures the handlebars in position.
As used herein, the term “positioning component” refers to a component that may be engaged or disengaged in a hole or slot to prevent or allow positional rotation of the handlebars between riding and parked positions. A positioning component may be any structure known in the art that securely engages one or more movable parts in position, including but not limited to a pin, a lever, a spring release, a push button, a straight line action clamp, a stop, or any component known in the art which facilitates locking when engaged and positioning when disengaged.
As used herein, the term “rigidity” refers to a condition in which movement and/or repositioning of adjacent components is minimized or limited.
Many municipalities and college campuses encourage the use of bicycles. Barriers to bicycle use include lack of storage space when the bike is not in use and risk of theft.
The handlebars of conventional bicycles are much wider than the bicycle frame and allow only for minimal rotation, increasing the amount of space required to store a bicycle and making it problematic to store a bicycle in smaller areas, such as a hallway, dorm room, or a garage with limited storage space. The width of the handlebars also makes transporting a bicycle on a vehicle with a bicycle rack, in a vehicle without a bicycle rack, or on a boat or kayak more difficult. In addition, in crowded bicycle racks, the width of the handlebars also makes it difficult to squeeze in and remove a bicycle from between other bicycles.
There have been a few attempts in the prior art to create a pivotable handlebar stem which allows the handlebars to be pivoted for more convenient storage. One example of a pivotable handlebar stem is disclosed by U.S. Pat. No. 5,727,427 (Nien '427). Nien '427 discloses a pivotable handlebar stem comprised of a column with an extension tube extending from the column. The extension tube has a piston and a clamp with an undulating face formed on the free ends of both the extension tube and the clamp. When the free ends of the extension tube and clamp are mated, the extension tube and clamp are securely connected together. A coil spring is located between a rib of the extension tube and the second end of the piston. When the bicycle is parked, the rider pushes a positioning button downward to release connection between the extension tube and the piston. The clamp and handlebar are then pulled out and the handlebar is turned to an angle which is perpendicular to the horizontal riding position. The coil spring then causes the clamp to recoil back to connect with the extension tube.
The pivotable handlebar stem taught by Nien '427 is undesirable for a number of reasons. The handlebar stem taught by Nien 427 uses interlocking components that offer minimal control when adjusting the position of the handlebars. The handlebar stem relies on a coil spring to reengage the interlocking piston and the extension tub; a coil spring does not provide the rigidity required for bicycle safety by allowing play in the handlebars when the bike is in use. The pivotable handlebar stem taught by Nien'427 also requires specially machined parts, which must be installed during the manufacturing of the bicycle.
Theft of bicycles is also a concern, especially on college campuses. According to FBI statistics, 1.5 million bicycles are stolen every year.
It is desirable to have a pivotable handlebar stem apparatus with a rigidity comparable to the handlebar stems of conventional bicycles.
It is desirable to have a pivotable handlebar stem apparatus which allows handlebars to be positioned only in a riding position and a parked position ensuring that the handlebars are always correctly positioned.
It is desirable to have a pivotable handlebar stem apparatus which further includes an anti-theft lock assembly which prevents the handlebars from being rotated from a parked position to a riding position, serving as a theft deterrence.
It is desirable to have a pivotable handlebar stem apparatus which requires a minimal number of specially manufactured components.
It is further desirable to have a pivotable handlebar stem apparatus which can be installed during the manufacturing of the bicycle or being purchased and installed aftermarket.
The present invention is a pivotable handlebar stem apparatus comprised of a clamp body, a cam lock, and a positioning component. The clamp body fits around a handlebar stem or portion of the handlebars of a bicycle. When the cam lock is unlocked and the positioning component is disengaged, the handlebars may be rotated from a riding position to a parked position for convenient storage. The pivotable handlebar stem apparatus may further include an anti-theft lock assembly, which prevents the handlebars from being rotated without first unlocking a separate locking mechanism (e.g., using a key).
For the purpose of promoting an understanding of the present invention, references are made in the text to exemplary embodiments of a pivotable handlebar stem apparatus for efficient storage of a bicycle, only some of which are described herein. It should be understood that no limitations on the scope of the invention are intended by describing these exemplary embodiments. One of ordinary skill in the art will readily appreciate that alternate but functionally equivalent components, materials, placement, and designs may be used. The inclusion of additional elements may be deemed readily apparent and obvious to one of ordinary skill in the art. Specific elements disclosed herein are not to be interpreted as limiting, but rather as a basis for the claims and as a representative basis for teaching one of ordinary skill in the art to employ the present invention.
It should be understood that the drawings are not necessarily to scale; instead, emphasis has been placed upon illustrating the principles of the invention. In addition, in the embodiments depicted herein, like reference numerals in the various drawings refer to identical or near identical structural elements.
Moreover, the terms “substantially” or “approximately” as used herein may be applied to modify any quantitative representation that could permissibly vary without resulting in a change in the basic function to which it is related.
a illustrates a perspective view of an exemplary embodiment of pivotable handlebar stem apparatus 100 with handlebars 120 in the riding position. Pivotable handlebar stem apparatus 100 is comprised of clamp body 40, cam lock 10, and positioning component 60.
In the embodiment shown, clamp body 40 is secured around handlebar stem inner sleeve 20 and handlebar stem outer sleeve 30 of a bicycle and is comprised of clamp body sections 44a, 44b, 44c separated by slots 42a, 42b. In the embodiment shown, slot 42a separates clamp body sections 44a from clamp body section 44b and slot 42b separates clamp body sections 44a, 44b from clamp body section 44c.
When cam lock 10 is locked, clamp body sections 44a, 44b are pinched together creating the clamping force necessary to secure clamp body 40 tightly around handlebar stem inner and outer sleeves 20, 30 and preventing handlebars 120 from being rotated from a riding position to a parked position and vice versa. When cam lock 10 is unlocked, clamp body sections 44a, 44b are loosened around handlebar stem inner and outer sleeves 20, 30 allowing handlebars 120 to be rotated when positioning component 60 is disengaged.
In the embodiment shown, cam lock 10 is in the locked position. When cam lock 10 is in the locked position, handlebars 120 are secured either in riding position or in parked position.
Positioning component 60 retains inner sleeve 20 to outer sleeve 30 and allows for positional rotation of handlebars 120 from a riding position (
In the embodiment shown, positioning component 60 is a retractable plunger. In other embodiments, positioning component 60 may be a straight-line action clamp (
In the embodiment show, clamp body 40 is comprised of aluminum; however, in other embodiments, clamp body 40 may be comprised of steel, another type of metal or other material known in the art which is capable of being secured around a handlebar stem.
In the embodiment shown, clamp body 40 is formed as a single component which is installed around the handlebar stem inner sleeve 20 and handlebar stem outer sleeve 30 during manufacturing and is added to the bicycle during assembly. In other embodiments, handlebar stem 130 and handlebars 120 with pivotable handlebar stem apparatus 100 may be sold as aftermarket components and installed on a bicycle by removing the existing handlebar stem 130 and handlebars 120 from head tube 140.
Also visible in the embodiment shown is a portion of bicycle rack 200. Pivotable handlebar stem apparatus 100 may be used to secure a bicycle to a bicycle rack. To secure a bicycle with pivotable handle stem apparatus 100 to a bicycle rack, handlebars 120 are rotated from a riding position to a parked position and then inserted between the vertical rails of bicycle rack 200 (see
b illustrates a perspective view of an exemplary embodiment of pivotable handlebar stem apparatus 100 with cam lock 10 unlocked, positioning component 60 disengaged, and handlebars 120 in the riding position. To unlock pivotable handlebar stem apparatus 100, cam lock 10 is unlocked and positioning component 60 is disengaged from clamp body 40. When cam lock 10 is unlocked and positioning component 60 has been disengaged from clamp body 40, handlebars 120 may be rotated to a parked position. When handlebars 120 are rotated, handlebar stem outer sleeve 30 also rotates.
In the embodiment shown, handlebars 120 are designed to be rotated counterclockwise.
In the embodiment shown, positioning component 60 has threads that correspond to threads in aperture 45 in clamp body and positioning component 60 is rotated to disengage from clamp body 40 (see
c illustrates a perspective view of an exemplary embodiment of pivotable handlebar stem apparatus 100 with cam lock 10 locked, positioning component 60 engaged, and handlebars 120 in the parked position. In the embodiment shown, handlebars 120 have been rotated to a parked position. In the embodiment shown, handlebars 120 are rotated counterclockwise to a parked position; however, in other embodiments, handlebars 120 may be rotated clockwise to a parked position.
To secure handlebars 120 in a parked position, positioning component 60 is released back into clamp body 40 and cam lock 10 is locked. To return handlebars 120 to a riding position, cam lock 10 is unlocked and positioning component 60 is disengaged from clamp body 40. Handlebars 120 may be then be rotated clockwise to the riding position, positioning component 60 released back into clamp body 40, and cam lock 10 locked.
In the embodiment shown, handlebars 120 are being inserted through the vertical rails of bicycle rack 200.
When pivotable handlebar stem apparatus 100 is assembled, positioning component 60 passes through aperture 45 in clamp body 40, through aperture 35a in handlebar stem outer sleeve 30 and into aperture 25 in handlebar stem inner sleeve 30. When positioning component 60 is disengaged, retaining pin 50 of positioning component 60 is capable of moving along slot 36 allowing handlebars to be rotated counterclockwise to a parked position. Retraining pin 50 will be at rest in aperture 25 in handlebar stem inner sleeve 20. Handlebar 120 will be in riding position when retaining pin 50 engages apertures 25 and 35a, and will be in parked position when retaining pin 50 engages apertures 35b and 25. The body of positioning component 60 is too wide to move through slot 36 so handlebars 120 are secured in the parked position until positioning component 60 is disengaged.
In the embodiment shown, handlebars 120 may be secured in only two positions: a riding position (positioning component 60 inserted into aperture 35a) and a parked position (positioning component 60 inserted into aperture 35b). In addition, the design shown ensures that handlebars 120 are correctly and safely positioned.
Also visible in the embodiment shown is slot 22 on handlebar stem outer sleeve 30. Slot 22 allows handlebar stem outer sleeve 30 to fit more tightly around handlebar stem inner sleeve 20.
In the embodiment shown, there is a small overlap between handlebar stem outer sleeve 30 and handlebar stem inner sleeve 20 when pivotable handlebar stem apparatus 100 is assembled (see
In the embodiment shown, positioning component 60 is in the locked position and passes through aperture 35a in handlebar stem outer sleeve 30 (handlebars 120 in riding position), engaging aperture 25 in handlebar stem inner sleeve 20.
Including an anti-theft lock assembly with pivotable handlebar stem apparatus 100 may serve as a theft deterrent. For example, key 72 will be necessary to rotate handlebars 120 from a parked position to a riding position; when handlebars 120 are in a parked position, the bicycle cannot be ridden, which may deter a potential thief. In addition, if the bicycle is secured to a bicycle rack as shown in
In the embodiment shown, pivotable handlebar stem apparatus 100 includes cam lock 10, positioning component 60, which is inserted through clamp body 40 adjacent to cam lock 10 (see
When handlebars 120 are in the riding position, positioning component 60 is engaged and is inserted through aperture 65a in handlebar stem 130. When cam lock 10 is unlocked and positioning component 60 is disengaged, clamp body 40 and handlebars 120 may be rotated clockwise until aperture 65b is lined up with positioning component 60. Positioning component 60 may be then be engaged by inserting it through aperture 65b into handlebar stem 130. Cam lock 10 is then locked, securing handlebars 120 in the parked position.
In various other embodiments, pivotable handlebar stem apparatus 100 may further include an anti-theft lock assembly.
In the embodiment shown, cam lock 10 is locked, positioning component 60 is engaged, and handlebars 120 are in the riding position. To rotate handlebars 120 to a parked position, cam lock 10 is unlocked and positioning component 60 is pressed, allowing handlebars 120 to be rotated counterclockwise to a parked position. When handlebars 120 are in the riding position, positioning component 60 protrudes through aperture 25a in handlebar stem outer sleeve 30. When handlebars 120 are in the parked position, positioning component 60 protrudes through aperture 25b in the handlebar stem outer sleeve 30.
Handlebar stem outer sleeve 30 has apertures 25a, 25b for positioning component 60 and slot 78a for locking cylinder 70. Handlebar stem inner sleeve 20 has aperture 35 for positioning component 60 and slot 78b for locking cylinder 70. Also visible is spring 62, which allows positioning component 60 to disengage and reengage.
When handlebars 120 are in the riding position, positioning component 60 resides in aperture 35 in handlebar stem inner sleeve 20 and protrudes through aperture 25a in handlebar stem outer sleeve 30. When cam lock 10 is unlocked and positioning component 60 is pressed, handlebar stem outer sleeve 30 and handlebars 120 may be rotated counterclockwise. When handlebar stem outer sleeve 30 and handlebars 120 are rotated, positioning component 60 rests in handlebar stem inner sleeve 20 and re-engages outer sleeve 30 and aperture 25b. Handlebars 120 are rotated until positioning component 60 protrudes through aperture 25b in handlebar stem outer sleeve 30.
When handlebars 120 are in the parked position, positioning component 60 may be pressed to allow the handlebars to be rotated clockwise back to the riding position.
