Patent Description:
In the field of lighting, in order to achieve the flexible application of lamps, the lamp body will be set to the form that can be rotated, which is especially the case for a track lamp, with an adapter that matches an associated power supply track, wherein the lamp body and the adapter are connected by a swivel arm, the lamp body can be rotated relative to the swivel arm, and the swivel arm can be rotated relative to the adapter, so that the lamp body enables the function of multi-angle lighting.

In the prior art, in order to achieve the rotational connection between the swivel arm and the adapter, the swivel arm is set up separately, including a connecting shaft provided on the adapter, wherein the connecting shaft is then fixedly connected to the main body of the swivel arm, and a plastic spacer for rotational stop is also required to be set in the connecting shaft and the adapter. This results in a complicated structure, the requirement of high manufacturing precision particularly for the connecting shaft, and in high overall costs.

Therefore, it becomes important to provide a track lamp of simple structure and low costs.

<CIT> discloses a track lamp according to the preamble of claim <NUM>, including a swivel arm that is divided into a first rotating half and another member corresponding to a second rotating half. Both members are rotatably supported in the casing halves of the track lamp adapter.

<CIT> discloses a light fitting including a lamp fitting, a linear arm attached to the lamp fitting and a cylindrical plug attached to the arm. The lamp fitting comprises an arm attachment part to which the arm is rotatably attached, and a lamp fitting cover which is disposed closer to a side part of the arm attachment part. The lamp fitting cover is attached so as to avoid blocking rotation of the arm and enclose at least a part of an outer periphery of the arm attachment part and forms an enclosure of the lamp fitting.

<CIT> discloses a low voltage distribution system comprising a two-conductor track of which one conductor is an outer conductor formed by its casing and the other conductor is an inner copper strip held by insulation. An adaptor can be fitted anywhere along the track and interlocked by closing pivoted members so that portions displace resilient arms outwardly to interlock lips of the adaptor with lips of the track. A fully rotatable contact assembly includes a centre contact inside a sleeve contact as well as a lamp bracket which rotates as one with the contact assembly so that wires to the lamp never get twisted. For ease of mounting, a fixing device comprises a rotatable member which can be mounted to a support by a centre screw and having a slot or opening to receive a connecting piece which is slidably connected to the back of the track casing by undercut tongue and groove.

It is an object of the present invention to provide a track lamp suited to overcome the aforementioned disadvantages, and that is in particular more convenient to be mounted on a track adapter, enabling more convenient friction and abrasive characteristics and reduced manufacturing costs.

This problem is solved by a track lamp as claimed in claim <NUM>. Further advantageous embodiments are the subject-matter of the dependent claims.

In a track lamp according to the present invention, the rotating shaft of the swivel arm is arranged in a split mode along the direction of the first rotating center line, so that the rotating shaft is more convenient to manufacture. By first forming the first rotating half shaft and the second rotating half shaft and the connecting the two rotating half shafts to form a first rotating axis, the swivel arm is more convenient to be mounted on a track adapter, and thus a standard high-voltage track adapter can be adopted. Moreover, by splitting the swivel arm into two half casings each preferably being made of a different material, the friction and abrasive characteristics of each of the rotation axes can be adjusted conveniently, and manufacturing costs can be reduced significantly.

Hereinafter, the invention will be described with reference to the accompanying drawings, wherein:.

Throughout the drawings, the like reference numerals designate the same or technically equivalent members or groups of members.

Specific embodiments of the present invention will be described in further detail below based on the accompanying drawings. It should be understood that the description of the embodiments of the present invention here is not intended to limit the protection scope of the present invention.

As shown in <FIG>, the track lamp of this embodiment comprises an adapter <NUM>, a swivel arm <NUM> and a lamp body <NUM>. At the end close to the adapter <NUM>, the swivel arm <NUM> comprises a first rotating axis <NUM>, which is divided into a first rotating half-axis <NUM> and a second rotating half-axis <NUM>, which together define the first rotating axis <NUM> and each extend along a direction perpendicular to the first rotating centerline <NUM>. The configuration and function of the adapter <NUM> and lamp body <NUM> is generally known from the prior art except for the part connected to the swivel arm <NUM>, so that details thereof will not be described in the following.

In the swivel arm <NUM> of the present embodiment, the first rotating shaft <NUM> is arranged split along the direction of the first rotating center line <NUM>, i.e. the first rotating shaft <NUM> consists of two separate bearing shells connected to each other. This structure is more convenient to manufacture, because the first rotating shaft <NUM> originally needs to be finished, and after being separated, the first rotating shaft can be directly formed by casting, thereby reducing the cost.

In this embodiment, the connection surfaces of the first rotating half shaft <NUM> and the second rotating half shaft <NUM> coincide with the first rotating center line <NUM>. The first rotating half shaft <NUM> and the second rotating half shaft <NUM> can be fixedly connected by means of screws (as shown in the drawings) or by other fixed connection methods.

The first rotation axis <NUM> is used for realizing a horizontal rotation of the track lamp, and maximum angle of the horizontal rotation can be limited by limiting protrusions, as generally known from prior art, so that there is no need to repeat details of this setting, and in this embodiment, maximum angle of the horizontal rotation may be set to <NUM> degrees.

In this embodiment, the first rotating axis <NUM> is formed as a disc structure. The disc structure offers more contact surfaces, increasing the friction surface, and rotation connection with damping can be obtained if the opposite contact surfaces are tightly mated, thereby enabling a smoother hand feeling of the rotating movement, when horizontally rotating the track lamp.

Further, in this embodiment, the middle section of the disc structure is provided with an annular (ring-shaped) clamping groove <NUM>, thereby increasing the contact surface with the adapter <NUM>.

In this embodiment, the adapter <NUM> includes a left housing <NUM> and a right housing <NUM> split along the vertical first rotating center line <NUM>. The left housing <NUM> and the right housing <NUM> are formed as separate members that are connected with each other to clamp the first rotating shaft <NUM> properly and enable a tight-fit installation. The above structure is more convenient to manufacture and install. The inner shapes of the left housing <NUM> and right housing <NUM> in the region accommodating and supporting the first rotating shaft <NUM> correspond to the shape of the first rotating shaft <NUM>. In this embodiment, the left housing <NUM> and right housing <NUM> are provided with grooves and faces adapted to the disc structure of the first rotating shaft <NUM>. Moreover, the left housing <NUM> and right housing <NUM> are provided with annular clamping edges <NUM> inserted into the clamping grooves <NUM> to clamp the first rotating shaft <NUM>.

In this embodiment, the swivel arm <NUM> further comprises a second rotating shaft <NUM> tightly fitted and connected to the lamp body <NUM>. As shown in <FIG>, the lamp body <NUM> comprises a base <NUM> for mounting the second rotating shaft <NUM> and a pressing block <NUM> for pressing the second rotating shaft <NUM> against the base <NUM> to adjust the friction at the second rotating shaft <NUM>. This structure is convenient to install and manufacture. The pressing block <NUM> is semicircular and fixed by screws on both sides, and the base <NUM> and the pressing block <NUM> are further provided with grooves for axially limiting the second rotating shaft <NUM>. The base <NUM> and the lamp body <NUM> can be made of the same material, generally of metal and particularly of a thin metal sheet. On the other hand, the pressing block <NUM> can be made of a plastic material that is highly resistant to abrasion, particularly of polyamide, so that the track lamp according to the present invention has good fatigue resistance and can rotate more smoothly. Polyamide can be used e.g. in a low-pressure molding process for manufacturing the pressing block <NUM> at high precision.

In this embodiment, the splicing or splitting direction of the first rotating half shaft <NUM> and the second rotating half shaft <NUM> is parallel to the centerline of the second rotating shaft <NUM>, that is, when the connecting surface of the first rotating half shaft <NUM> and the second rotating half shaft <NUM> is horizontal, the connecting surface is perpendicular to the centerline of the second rotating shaft <NUM>.

The second rotating shaft <NUM> is used for realizing a vertical rotation of the lamp body <NUM>, and is limited by arranging a protrusion, as is generally known from the prior art, so that details thereof need not be described here. In this embodiment, the maximum angle of the vertical rotation my be set to <NUM> degrees.

In this embodiment, the second rotating shaft <NUM> formed at the end of the swivel arm <NUM> opposite to the first rotating axis <NUM> comprises an inner shaft <NUM> and an outer shaft <NUM> sleeved or snapped on the inner shaft <NUM>, as shown in <FIG>. As can be concluded from <FIG> and <FIG>, the swivel arm <NUM> is split into two halves (casings) and comprises an inner half arm <NUM> disposed close to the lamp body <NUM> and an outer half arm <NUM> remote from the lamp body <NUM>. While the first rotating half shaft <NUM> and the outer shaft <NUM> are integrally formed with the inner half arm <NUM>, the second rotating half shaft <NUM> and the inner shaft <NUM> are formed integrally with the outer half arm <NUM>. Preferably, the outer half arm <NUM> is made of metal such as aluminum alloy, steel and the like, in particular of a thin metal sheet by punching and stamping, whereas the inner half arm <NUM> is made of a plastic material that is highly resistant to abrasion, such as polyamide, and can be manufactured by an injection molding process, in particular low-pressure molding process. Overall, this results in a rotational support of the lamp body <NUM> which has high reliability and good fatigue resistance, makes the rotation arm <NUM> rotate more smoothly and stably, and can be manufactured at high precision at low costs.

With the above arrangement, a high mechanical strength and stability of the swivel arm <NUM> can be ensured, and the manufacturing cost can be reduced. Preferably, the inner shaft <NUM> is made of metal, such as aluminum alloy, steel and the like, in particular of a thin metal sheet by punching and stamping, whereas the outer shaft <NUM> is made of a plastic material that is highly resistant to abrasion, such as polyamide, and can be manufactured by an injection molding process, in particular low-pressure molding process. Overall, this enables a mechanical strength and stability of the second rotating shaft <NUM>, that can be manufactured at high precision at low costs, so that the rotation of the lamp body <NUM> can be smoother.

In this example, a cavity <NUM> is provided between the two casing halves of the swivel arm <NUM>, namely between the inner arm half <NUM> and the outer arm half <NUM>, that can be used to guide a wire from the adapter <NUM> to the lamp body <NUM> for supplying electric power to a light emitting element or a power supply disposed in the lamp body <NUM>.

In this embodiment, the swivel arm <NUM> is L-shaped, which facilitates mounting the lamp body <NUM> stably. Moreover, the lamp body <NUM> includes a housing <NUM>, a top cover <NUM>, a power source <NUM>, a heat sink <NUM> and a light emitting element <NUM>, such as an LED-array. Further details of the lamp body <NUM> need not be described as they are generally known from the prior art, and, of course, the swivel arm according to the present invention can be adopted also to other forms of track lamps.

Claim 1:
A track lamp comprising an adapter (<NUM>), a swivel arm (<NUM>) and a lamp body (<NUM>), wherein
the swivel arm (<NUM>) comprises a first rotating shaft (<NUM>) connected with the adapter (<NUM>) in a tight fit mode, and
the first rotating shaft (<NUM>) is divided into a first rotating half shaft (<NUM>) and a second rotating half shaft (<NUM>) along a direction of a first rotating center line (<NUM>);
wherein
the swivel arm (<NUM>) further comprises a second rotating shaft (<NUM>) tightly fitted to the lamp body (<NUM>), wherein
the second rotating shaft (<NUM>) comprises an inner shaft (<NUM>) and an outer shaft (<NUM>) sleeved on the inner shaft (<NUM>),
the swivel arm (<NUM>) is split into two halves and comprises an inner half-arm (<NUM>) disposed close to the lamp body (<NUM>) and an outer half-arm (<NUM>) remote from the lamp body (<NUM>),
the first rotating half shaft (<NUM>) and the outer shaft (<NUM>) are integrally formed with the inner half arm (<NUM>), and
the second rotating half shaft (<NUM>) and the inner shaft (<NUM>) are formed integrally with the outer half arm (<NUM>).