Patent Application
20050094400
1. Field of the Invention
This invention relates to a chain-controlled lamp stand with multi-stage light modulation, particularly to one having a multi-stage light modulating device provided inside a lamp stand, needless to install an additional light-modulating controller outside the lamp stand .
2. Description of the Prior Art
A conventional chain-controlled lamp stand is provided with a chain pulled to turn on and off a light, but the conventional lamp stand itself cannot carry out multi-stage light modulation. Therefore, a light-modulating controller has to be additionally provided outside the conventional chain-controlled lamp stand in order to carry out multi-stage light modulation, thus enlarging whole dimensions, spoiling esthetical appearance and increasing cost.
The objective of the i n vent i on is to offer a chain-controlled lamp stand with multi-stage light modulation, having a multi-stage light modulating device with a chain-controlled switch provided inside a lamp stand and needless to install an additional light-modulating controller outside the lamp stand.
This invention will be better understood by referring to the accompanying drawings, wherein:
A first preferred embodiment of a chain-controlled lamp stand with multi-stage modulation in the present invention, as shown in
The structure and assembly of above-mentioned components are described below.
The circular holder 5 and the center tongue 4 are respectively connected with two electrodes of a lamp so that when the switch is ON, the lamp is connected with power.
The third fastening member 3 is orderly inserted through the insert hole 40 of the center tongue 4, the first insert hole 60 of the first base 6, the first insert hole 160 of the second base 16 and the first insert hole 170 of the light modulation circuit board 17 to firmly combine these components together.
The second fastening member 2 is orderly inserted through the first insert hole 50 of the circular holder 5, the second insert hole 61 of the first base 6, the second insert hole 161 of the second base 16 and the second insert hole 171 of the light modulation circuit board 17 to firmly combine these components together, only the first line-connecting base 22 has to be inserted through the grooved hole 172 of the light modulation circuit board 17 before assembling the second fastening member 2.
The first fastening member 1 is inserted through the second insert hole 51 of the circular holder 5 and the grooved hole (not shown) of the first base 6 and then firmly screwed with the first base 6 to fix the circular holder 5 in position.
Thus, the circular holder 5 and the first line-connecting base 22 is connected with each other by the second fastening member 2; therefore the printed circuit on the light modulation circuit board 17 can make the first line-connecting base 22 contacted with the second fastening member 2 to let one of two power lines connected with the first line-connecting base 22 by the first line-connecting screw 21, and the other power line makes the third fastening member 3 connected with the center tongue 4 by the electronic switch of the light modulation circuit board 17 of the second line-connecting base 24.
The compression spring 7 has one end fixed on the first base 6 and the other end inserted through the lower stud 121 of the rotatable rod 12 to force the rotatable disc 11 closely push against the rotatable rod 12, letting the compression spring 7 and the rotatable disc 11 positioned to face each other.
The pull chain 9 has one end fixed on the rotatable disc 11 and the other end inserted through the bell-shaped base 10 to be connected with the bell-shaped member 8. The bell-shaped base 10 is fixedly positioned on the first base 6 by the sixth fastening member 33.
The first contact strip 13 is positioned on the rotatable rod 12 by fitting its central insert hole 130 around the small projecting member 123 of the upper stud 120 of the rotatable rod 12, having, its arc-shaped portion 131 positioned in the teeth groove 122 of the upper stud 120 on the rotatable rod 12. Thus, the first contact strip 13 can be firmly positioned to conduct electricity stably when it rotates together with the rotatable rod 12 and contacts with the first, the second and the third connecting strip 15, 30 and 31.
The second contact strip 14 has its insert hole 140 fitted around the small projecting member 123 of the stud 120 of the rotatable rod 12, letting the second contact strip 14 slidably positioned on the first contact strip 13. The second contact strip 14 has its upper vertical portion 141 inserted through the third insert hole 162 of the second base 16 and in the lengthwise through hole of the fourth fastening member 27 and soldered therein.
The first, the second and the third connecting strip 15, 30 and 31 have their lower portions positioned in the second base 16, and their upper portions are inserted through the second base 16 and soldered on the light modulation circuit board 17.
The insulation spacer 32 has its two position holes 320 respectively fitted with two projecting members (not shown) provided under the second base 16 and then fixed thereon with glue. Thus, the insulation spacer 32 can completely insulate the exposed metallic members from the switching element so as to prevent a user of the lamp stand from shock.
The capacitor 19, the first resistance 20 (R1), the second resistance 23 (R2) and the third resistance 28 (R3 are soldered on the light modulation circuit board 17, and the second line-connecting base 24 is inserted through the grooved hole 173 of the light modulation circuit board 17 and fixed thereon by the fourth fastening member 27.
The TRIAC 26 is fixed on the light modulation circuit board 17 by the fi ft h fastening member 29, having its two feet soldered on the light modulation circuit board 17.
A chain-controlled switch in this preferred embodiment is composed of the compression spring 7, the bell-shaped member 8, the pull chain 9, the bell-shaped base 10, the rotatable disc 11, the rotatable rod 12, the first contact strip 13 and the second contact strip 14. When the pull chain 9 is pulled, the rotatable disc 11 will be actuated to rotate and the projecting teeth 110 on the rotatable disc 111 and the projecting teeth 124 of the rotatable rod 12 meshed together will actuate the first contact strip 13 on the rotatable rod 12 to rotate. Thus, when the pull chain is pulled repeatedly, the first contact strip 13 will be moved to different positions in the second base 16, and the lamp stand will be connected with circuit for multi-stage light modulation or disconnected to form open circuit, as shown in FIGS. 2 to 5. In addition, the upper protruding-out end of the compression spring 7 is able to force the rotatable disc 11 to quickly recover its original position after the rotatable disc 11 is turned around, enabling the chain-controlled switch to be operated repeatedly.
In accordance with the above-mentioned device in the first preferred embodiment, the conditions of multi-stage light modulation of the lamp stand are specifically described below.
(A). A condition of high brightness: when the first contact strip 13 positioned in the second base 16 is moved to contact with the first connecting strip 15, as shown in
(B). A condition of medium brightness: when the first contact strip 13 positioned in the second base 16 is moved to contact with the second connecting strip 30, as shown in
(C). A condition of low brightness: when the first contact strip 13′ positioned in the second base 16 is moved to contact with the third connecting strip 31, as shown in
(D). A turned-off condition of the lamp: when the first contact strip 13 positioned in the second base 16 does not contact with any connecting strip, as shown in
As can be noted from the above description, this invention has the following advantages.
1. Electronic elements are adopted to control voltage waveform to carry out light modulation, and the light modulation circuit board 17 provided with double-sided printed circuit enables the electronic elements to be soldered and positioned on the two surfaces of the light modulation circuit board, diminishing the dimensions of the lamp stand.
2. The first resistance 20 (R1), the second resistance 23 (R2) and the third resistance 28 (R3) are respectively soldered by a mode of SMT (surface mount technology), able to enhance processing efficiency and low processing cost.
3. It is structured stably and has great capacity of insulation and high utilization in industry.
A second preferred embodiment of a chain-controlled lamp stand with multi-stage light modulation in the present invention, as shown in
The structure and the assembly of the above-mentioned components are described below.
The circular holder 35 and the center tongue 32 are respectively connected with two electrodes of a lamp so that when the switch is ON, the lamp is connected with power.
The center tongue 32 and the first contact strip 36 are fixedly assembled on the first base 38 by the second fastening member 33, and the circular holder 35 and the first line-connecting base 39 are fixedly assembled on the first base 38 by the third fastening member 34, with a power zero line connected with the first line-connecting base 39 through the first line-connecting screw 40. The first fastening member 31 is inserted through the through hole of the circular holder 35 and screwed firmly on the first base 38 to fix the circular holder 35 in position.
The second contact strip 58 is fixed with the first base 38 by the seventh fastening member 57, and the conjugated contact strip 55 and the second line-connecting base 54 are firmly fixed on the first base 38 by the sixth fastening member 56, with a power phase line connected with the second line-connecting base 54 through the second line-connecting screw 53. The insulation spacer 52 has its two position holes 520 respectively fitted on the two position studs 380 of the first base 38, which are respectively inserted and positioned in two insert holes (not shown) of the second base 48, letting the insulation spacer 52 fixed between the first and the second base 38 and 48. Thus, the insulation spacer 52 can insulate the live portion of the first contact strip 36 and the diode 37 and the second contact strip 38 from switch elements so as to prevent a user of the lamp stand from getting electric shock.
The rotary metal bar 41 is positioned in the six helical teeth grooves 381 in the upper central side of the first base 38, and the compression spring 42 positioned in the through hole 430 of the rotatable rod 43 enables the rotary metal bar 41 to quickly contact with or separate from the first contact strip 36, the conjugated contact strip 55 and the second contact strip 58. The pull chain 44 has one end secured on the movable disc 45 and the other end inserted through the bell-shaped base 50 and connected with the bell-shaped member 51. The torque spring 46 has one end pressing the rotatable disc 45 to closely push against the rotatable rod 43 and the other end assembled in the second base 48. The bell-shaped base 50 is firmly fixed on the second base 48 by the fifth fastening member 49, and the first base 38 and the second base 48 are fixedly combined together by the fourth fastening member 47.
A chain-controlled switch in the second preferred embodiment is composed of the rotary metal bar 41, the press reed 42, the rotatable rod 43, the pull chain 44, the rotatable disc 45, the torque spring 46, the bell-shaped base 50 and the bell-shaped member 51. When the pull chain 44 is pulled to actuate the rotatable disc 45 to rotate, the projecting teeth 450 of the rotatable disc 45 and the projecting teeth 431 of the rotatable rod 43 meshed together will actuate the rotary metal bar 41 to rotate. Thus, when the rotary metal bar 41 is rotated to different positions in the six teeth grooves 381 of the first base 38, as shown in
According to the above-mentioned device in the second preferred embodiment, the conditions of multi-stage light modulation of the lamp stand are described as follows.
(A). A condition of high brightness: when the rotary metal bar 41 in the first base 38 is turned to a first position as shown in
(B). A condition of medium brightness: when the rotary metal bar 41 in the first base 38 is turned to a second position as shown in
(C). A condition of electric disconnection: when the rotary metal bar 41 in the first base 38 is turned to a third position as shown in
As can be noted from the above-description, the lamp stand of this invention can carry out multi-stage light modulation with excellent effect and has very small dimensions.
While the preferred embodiments of the invention have been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.
