Patent Application
20080263827
1. Field of the Invention
The present invention relates to a hinge, and more particularly to a pivotal-axis changing hinge that allows a cover to be pivotally mounted to a base without the rotation of the cover being restricted by the base.
2. Description of Related Art
Portable electronic devices like calculators, translation machines, notebook computers, mobile phones and the like comprise a base, a cover and at least one hinge mounted between the base and the cover.
The hinge connects the cover to the base and allows the cover to rotate relative to the base. A hinge comprises two leaves and a pintle assembly. The leaves are respectively connected securely to the cover and the base and have pivoting holes that correspond to each other. The pintle assembly has a pivotal axis, is mounted through the pivoting holes of the leaves allowing the leaves to pivot along the pivotal axis of the pintle assembly.
However, if the base or the cover is thick, a proximal edge of the cover will inevitably hit the base when pivoting, restricting the rotating angle of the cover and causing inconvenience.
To overcome the shortcomings, the present invention provides a pivotal-axis changing hinge to obviate or mitigate the aforementioned problems.
The main objective of the present invention is to provide a pivotal-axis changing hinge having a pivotal axis. The pivotal axis can change position gradually during opening to prevent the cover from hitting a base.
The pivotal-axis changing hinge in accordance with the present invention comprises a stationary leaf, a pivoting leaf, a pintle assembly and a cam.
The pivoting leaf and stationary leaf are respectively connected securely to a cover having a rear edge and a keyway and a base having an elongated gudgeon. A parabolic edge is formed at an edge near the elongated gudgeon.
The pintle assembly is mounted through the keyway and pivotally through the elongated gudgeon.
The cam is mounted on the pintle assembly, rotates simultaneously with the pintle assembly and has a protrusion mounted slidably on the parabolic edge.
When the cover is opened relative to the base, the cam will abut the parabolic edge of the mounting bracket, gradually push the pintle assembly perpendicularly away from the base, along the long axis of the elongated gudgeon. Consequently, the proximal edge of the cover is kept from hitting the base and the rotating angle of the cover is expanded.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
The pivotal-axis changing hinges are separately mounted between the base (61) and the cover (62), and each pivotal-axis changing hinge comprises a pivoting leaf (10), a stationary leaf (20), a pintle assembly (30), a cam (40), a securing element (51) and an optional spacing assembly (50).
The pivoting leaf (10) is mounted securely in the cover (62) of the portable electronic device (60) and has a pivoting end, a mounting end, a keyway (12), a mounting tab and multiple fixing holes (11). The keyway (12) is formed through the pivoting end of the pivoting leaf (10) and is non-circular. The mounting tab is perpendicularly formed on the pivoting leaf (10) and has a side tab transversely protruding from the mounting tab. The fixing holes (11) are separately formed through the mounting tab for securing the pivoting leaf (10) to the cover (62) with fasteners.
The stationary leaf (20) is mounted securely in the base (61) of the portable electronic device (60) and has a distal end, and a proximal end, a mounting bracket (22) and multiple fixing holes (21). The mounting bracket (22) is formed at the proximal end perpendicular to the base and has a top edge, an elongated gudgeon (220) and a parabolic edge (221). The elongated gudgeon (220) is formed through the mounting bracket (22) of the stationary leaf (20) near the top edge, corresponding to the keyway (12) of the pivoting leaf (10), and is elongated and elliptical and has a long axis formed perpendicular to the base. The parabolic edge (221) is formed on the top edge of the mounting bracket (22) near the elongated gudgeon (220) and has a lower end and an upper end. The fixing holes (21) are separately formed through the stationary leaf (20) for securing the stationary leaf (20) to the base (61) with fasteners.
The pintle assembly (30) has a pivotal axis, a body (31), a key (32) and a pintle (33). The pivotal axis is defined longitudinally through the pintle assembly (30). The body (31) may be cylindrical and has a proximal end and a distal end. The key (32) protrudes from the distal end of the body (31) along the pivotal axis, is non circular in cross section and extends through and engages with the keyway (12) of the pivoting leaf (10). The pintle (33) protrudes from the proximal end of the body (31) along the pivotal axis, is non circular in cross section and has a threaded end (330), which extends through the elongated gudgeon (220) of the stationary leaf (20).
The cam (40) may be circular, is mounted on the pintle assembly (30) and is able to simultaneously rotate with the pintle assembly (30), and has a side surface, a center, a mounting hole (42) and a protrusion (41). The side surface abuts the mounting bracket (22) of the stationary leaf (20). The mounting hole (42) is formed through the center of the cam (40), is non circular and is mounted on the pintle (33) of the pintle assembly (30) to allow simultaneous rotation of the pintle assembly (30) and the cam (40). The protrusion (41) protrudes from the side surface of the cam (40) and is mounted slidably along the parabolic edge (221) of the mounting bracket (22),
The securing element (51) may be a nut, is mounted securely on the threaded end (330) of the pintle (33) for securing the pivoting leaf (10), the stationary leaf (20), the pintle assembly (30) and the cam (40).
The spacing assembly (50) comprises multiple spacers (500) that are mounted around the pintle (33) between the body (31) of the pintle assembly (30) and the securing element (51) to provide friction to hold the pivoting leaf (10) in position relative to the stationary leaf (20).
With further reference to
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description together with details of the structure and function of the invention, the disclosure is illustrative only. Changes may be made in detail especially in matters of shape, size and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
