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Reflective mechanism for stage lampReflective mechanism for stage lamp description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060109574, Reflective mechanism for stage lamp. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a reflective mechanism for a stage lamp. In particular, the present invention relates to a reflective mechanism for a stage lamp that includes a rotatable reflective mirror. [0003] 2. Description of the Related Art [0004] A stage lamp provides colorful light effects for a stage. FIG. 1 of the drawings illustrates a conventional stage lamp and FIG. 2 is an exploded perspective view of a reflective mechanism of the conventional stage lamp. The stage lamp includes a body 1, a light source 11 mounted in the body 1, a lens 12 mounted in the body 1, and a reflective mechanism 2. The reflective mechanism 2 includes a fixed frame 24 mounted on the body 1, a rotary frame 25, a first motor 21 mounted on the fixed frame 24 for rotating the rotary frame 25, a mirror frame 26, a reflective mirror 23 mounted on the mirror frame 26, and a second motor 22 mounted on the rotary frame 25 for rotating the mirror frame 26. [0005] When the first motor 21 turns, the rotary frame 25 rotates such that the reflective mirror 23 rotates about an axis parallel to an incident light from the light source 11. When the second motor 22 turns, the reflective mirror 23 rotates about an axis transverse to the axis. Thus, various light effects can be obtained. However, the first motor 21 must have a large horsepower for driving the rotary frame 25 carrying the second motor 22 and the mirror frame 26. Further, the rotary frame 25 and the mirror frame 26 are continuously changing their speed and direction such that both of the first motor 21 and the second motor 22 must have a large horsepower to overcome the rotational inertia. Further, positioning of the second motor 22 on the rotary frame 25 is not easy, as the rotary frame 25 rotates frequently when in use. SUMMARY OF THE INVENTION [0006] In accordance with a first aspect of the present invention, a reflective mechanism is provided for a stage lamp including a body and a support member mounted on the body. The reflective mechanism comprises a base fixed on the support member, a first motor mounted to the base and including an output shaft with a first gear, a first transmission device, a bracket including a bottom fixed on the base and a wall extending from the bottom, a second motor mounted on the wall of the bracket and including an output shaft with a second gear, a second transmission device, a mirror frame, and a reflective mirror mounted on a bottom plate of the mirror frame to turn therewith. [0007] The first transmission device includes a hollow shaft rotatably extending through an axial hole of the base and a first driven gear mounted on the hollow shaft to turn therewith. The first driven gear is meshed with and driven by the first gear. The hollow shaft further includes a fork on an end thereof. The second transmission device includes an endless cord and a second driven gear meshed with the second gear. The second driven gear includes a pulley extending from a side thereof. [0008] The mirror frame includes a pivotal portion pivotally mounted to the fork of the hollow shaft. The endless cord is wound around the pulley and the pivotal portion of the mirror frame, allowing joint rotation of the mirror frame and the second driven gear. The endless cord extends through the hollow shaft without interfering with rotation of the hollow shaft. [0009] When the first motor turns, the mirror frame together with reflective mirror rotates about a longitudinal axis of the hollow shaft. When the second motor turns, the mirror frame together with the reflective mirror pivots about a pivotal axis of the pivotal portion. [0010] Preferably, the longitudinal axis of the hollow shaft is parallel to an incident light from a light source mounted in the body of the stage lamp, and the pivotal axis of the pivotal portion is orthogonal to the longitudinal axis of the hollow shaft. [0011] In an embodiment of the invention, the first driven gear of the first transmission device includes a plurality of inner teeth. The first transmission device further includes a third gear securely mounted on the hollow shaft to turn therewith. The third gear includes a plurality of outer teeth for securely engaging with the inner teeth of the first driven gear to turn therewith. [0012] The third gear includes a groove in a side thereof. The base includes a restraining member received in the groove of the third gear, limiting joint rotational movement of the third gear and the hollow shaft, thereby limiting joint rotational movement of the mirror frame and the reflective mirror. [0013] The pivotal portion of the mirror includes two spaced stops for limiting pivotal movement of the mirror frame and the reflective mirror. [0014] Each of the pulley and the pivotal portion of the mirror frame includes an annular groove. The endless cord is wound around the annular groove of the pulley and the annular groove of the pivotal portion. [0015] The fork of the hollow shaft includes two spaced branches, and two tensioning rollers are rotatably mounted between the branches for guiding and tensioning the endless cord. [0016] The branches of the fork of the hollow shaft include aligned holes, and the pivotal portion includes a hole. A pin extends through the aligned holes of the fork and the hole of the pivotal portion. [0017] By such an arrangement, the reflective mirror in accordance with the present invention can be driven with low-horsepower motors, as the rotational inertia to be overcome is much smaller as compared to the conventional design. [0018] 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. BRIEF DESCRIPTION OF THE DRAWINGS [0019] FIG. 1 is a partly sectioned side view of a conventional stage lamp. [0020] FIG. 2 is an exploded perspective view of a reflective mechanism of the conventional stage lamp. [0021] FIG. 3 is a side view of a stage lamp with a reflective mechanism in accordance with the present invention. Continue reading about Reflective mechanism for stage lamp... Full patent description for Reflective mechanism for stage lamp Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Reflective mechanism for stage lamp patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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