Abstract:
An E26 wire-plugged bakelite lampholder is composed of a housing, an joint bracket, a threaded ring, a positive electrode plate and a negative electrode plate and installed to a downlight. The lampholder has two wire plug slots for plugging two electrodes of a power line by a bare line section, so that a power source is introduced with a convenient operation. The joint bracket and the housing of the E26 wire-plugged bakelite lampholder are made of a bakelite material, and a combining groove is reserved on the housing to provide for installing and positioning the joint bracket, and further inserting into the combining groove of the housing to engage via the combining latch rod of the joint bracket. In the meantime, the threaded ring of the E26 wire-plugged bakelite lampholder is integrally formed in the housing, so as to facilitate the manufacturing and assembling processes.

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a lampholder, and more particularly to the E26 wire-plugged bakelite lampholder that can be manufactured, assembled and electrically connected more conveniently. 
     Description of the Related Art 
     Bright light is a driving force for improvements in all aspects of human activities. Without the invention of bright lights (such as light bulbs) and a series of subsequent improvements and modifications, human beings cannot have such rapid advancement in all aspects. The introduction of tungsten light bulbs was a great invention of mankind, In the principle of the tungsten light bulbs, the resistance of an electrical conduction is used to heat a tungsten filament to incandescence, so as to emit light, since an amount of over 90% of the electric. energy consumed by the tungsten light bulb is converted into heat energy, and only an amount of 10% of the electric energy is used for emitting light. Obviously, the tungsten light bulbs have the drawbacks of high power consumption and low luminous efficiency. In recent years, government and private sectors of different countries in the world spare no effort to implement power saving and carbon reduction to maximize the utility of global resources and protect the ecology and environment instead of overdeveloping them. Particularly, in the aspect of illumination, various different power-saving fluorescent light bulbs and LED light bulbs are developed to replace the traditional tungsten light bulbs having the drawbacks of high power consumption and low luminous efficiency. 
     In a home environment, there is a “downlight” generally installed and used at home, and the downlight is a lamp embedded into a sealed ceiling. The conventional tungsten light bulb is generally installed in the downlight and used for the purpose of illumination. Since the environment using the downlight is sealed and the tungsten light bulb generates much heat, therefore the chance of burning the construction material such as the ceiling material becomes greater, and thus the downlight becomes a potential danger to the home environment. Therefore, the downlight is gradually replaced by a cold light illumination series. In other words, the power saving fluorescent light bulb and the LED light bulb are used as a light source to substitute the downlight. 
     The structure of a downlight is generally composed of a lamp body and a lampholder, wherein the lamp body is a shell object having an accommodating space formed therein. During assembling, the lamp body is embedded into an embedding hole formed on the ceiling to achieve the embedding and positioning effects. The bottom of the lamp body (that faces users) may be sealed by a cover or opened without having a cover, and the top of the lamp body is opened and slightly tapered to form an accommodating slot. The lampholder can be installed, fixed, and positioned into the accommodating slot, and the lampholder is provided for connecting a power line at the top and connecting a light bulb at the bottom. Therefore, the downlight can emit light downwardly from the light bulb, and then scatter downwardly in a range surrounding the lamp body to provide illumination, since the lampholder of the downlight generally has a specification of E26, therefore such lampholder is called an E26 lampholder. 
     With reference for  FIGS. 1 and 2  for a conventional lampholder  10  installed in a downlight, the conventional lampholder  10  is basically comprised of a housing  11 , a metal bracket  12  and a metal threaded ring  13 , wherein the housing  11  is made of a high temperature resistant ceramic material and formed into a cylindrical shape, and the top of the housing  11  is divided into positive and negative conductive lines  111  by a screwing or riveting means and the bottom of the housing  11  is opened inwardly; the metal bracket  12  is made of a flexible metal steel and divided into a roof portion  121  and two elastic board parts  122  disposed on both sides of the metal bracket  12  respectively, and the roof portion  121  is fixed to the top of the housing  11  (by the screwing or riveting means) for the assembling, so that the two elastic board parts  122  are extended slantingly outwardly from both sides of the housing  11  (as shown  FIG. 1 ); the metal threaded ring  13  is installed from the bottom of the housing  11  and coupled to the conductive line  111  of one of the electrode (negative electrode) of the metal threaded ring  13 , so that the conductive line  111 , the housing  11  and the metal threaded ring  13  are fixed to one another through the aforementioned screwing or riveting means, and the conductive line  111  of the other electrode (positive electrode) is coupled to a cathode conductive plate  112  by the screwing or riveting means (as shown in  FIG. 1 ), and the cathode conductive plate  112  is independently situated within an open range at the top of the metal threaded ring  13 . 
     After the downlight is assembled, the lampholder  10  is installed and positioned in the accommodating slot at the top of the lamp body of a downlight, so that the elastic board parts  122  disposed on both sides of the metal bracket  12  is latched to the wall of the accommodating slot at the top of the lamp body, so as to achieve the effect of securely fixing the lampholder  10  to the accommodating slot at the top the lamp body. When the whole downlight is installed to the ceiling, the lamp body of the downlight is embedded into the embedding hole formed on the ceiling, and the downlight is secured installed to the embedding hole by a latching means; then the conductive lines  111  are electrically connected and conducted with two electrodes of a power line connected to the mains power, so that a switch on the wall which is connected to the power lines may be used to control and turn on/off the power supply; and finally the light bulb is installed by extending the light bulb from the bottom of the lamp body, and a threaded joint screw of the light bulb is installed and secured into the metal threaded ring  13  of the lampholder  10 . Now, the top of the threaded joint screw of the light bulb abuts against the cathode conductive plate  112  to electrically conduct the conductive line  111  of the positive electrode, and the threaded portion of the threaded joint screw of the light bulb is electrically conducted with the conductive line  111  of the negative electrode through the metal threaded ring  13 . 
     The conventional lampholder  10  is a product that has been in existence for a longtime, and its housing  11  is made of a high temperature resistant ceramic material to resist the large amount of heat generated by the tungsten light bulb. However, the power saving fluorescent light bulb and LED light bulb (cold light illumination series) are used as a light source of the downlight instead. In summation, the conventional lampholder  10  has the following drawbacks and requires improvements. 
     1. The conventional lampholder  10  must have the positive and negative conductive lines  111  connected to the top of the housing  11  by a screwing or riveting means, and the conductive lines  111  are electrically conducted with the electrodes of the power line of the mains power respectively, and such structure and connection method are complicated. 
     2. In the design of the conventional lampholder  10 , the roof portion  121  of the metal bracket  12  and the top of the housing  11  are fixed by a screwing or riveting means, and such structure and connection method are also complicated. 
     3. In the design of the conventional lampholder  10 , the metal threaded ring  13  and the housing  11  are connected, and then the metal threaded ring  13  carries the threaded joint screw of the light bulb, and such structure and connection method are also complicated. 
     SUMMARY OF THE INVENTION 
     In view of the aforementioned drawbacks of the prior art, the inventor of the present invention conducted researches and experiments, and finally developed an E26 plastic lampholder in accordance with the present invention to overcome the drawbacks of the prior art. 
     Therefore, it is a primary objective of the present invention to provide an E26 wire-plugged bakelite lampholder that can be connected to a power supply more conveniently for its use on a downlight. 
     Another objective of the present invention is to provide an E26 wire-plugged bakelite lampholder that makes the assembling and operation of a housing and an joint bracket more conveniently for its use on a downlight. 
     A further objective of the present invention is to provide an E26 wire-plugged bakelite lampholder wherein a threaded ring is directly and integrally formed with a housing to facilitate the manufacturing and assembling process for its use on a downlight. 
     To achieve the aforementioned and other objectives, the present invention discloses an E26 wire-plugged bakelite lampholder comprising a housing, an joint bracket, a threaded ring, a positive electrode plate and a negative electrode plate, wherein the housing is made of a bakelite material and has an opening bottom inwardly penetrated to form an accommodating space, two latch slots symmetrically formed at the inner top of the housing. The top of the housing is provided with a horizontal combining groove located in the middle therein, two wire plug slots separately located in two sides therein and a pair of the combining slots separately located in the front and rear ends of the combining groove, and the positions of the wire plug slots correspondingly communicate with a latch slot separately, wherein a latch step defined within the combining slot, and a vertical shallow groove concavely formed on an internal wall of the housing; the joint bracket is made of a non-metal material and comprises a horizontal roof portion, two elastic board parts extended towards both sides and a pair of the combining latch rods located in the front and rear ends of the bottom end of the roof portion appearing to extend downwardly. The roof portion is coupled to the combining groove of the housing top, so that the two elastic board parts are slantingly extended to both sides of the housing respectively and the combining latch rods are inserted into the corresponding combining slots one-on-one to enable the bottom end of the combining latch rods to correspond and get stuck with the latch step of the combing slots; the threaded ring is made of a bakelite material and mainly for a threaded notch integrally formed on an internal wall of the housing and the threaded ring breaks its extension at the shallow groove and recurs after crossing the shallow groove; the positive electrode plate is made of an electrically conductive material and has a conductive protruding portion which makes an arc turn of substantially 180° after extending for a small section and then bends upwardly to form a vertical wall after extending for a small section, and a stop plate is stamped on the vertical wall, and an upper end of the vertical wall is turned in the opposite direction and extended to form an slantingly installed electric connection plate, and a latch recess is stamped at the front end of the electric connection plate, and the positive electrode plate is accommodated in the accommodating space of the housing, so that the electric connection plate and the vertical wall enter into one of the latch slots, and the latch recess of the electric connection plate is aligned precisely with one of the wire plug slots, and the stop plate on the vertical wall abuts against the latch slot wall to stop and position the positive electrode plate, while the conductive protruding portion on the positive electrode plate is extended to the center of an upper portion of the accommodating space; the negative electrode plate is made of an electrically conductive material and has a conductive bent portion which is bent and extended for a small section after being stretched upwardly, and then further bent upwardly to form a vertical wall, and a stop plate is stamped on the vertical wall of the negative electrode plate, and an upper end of the vertical wall of the negative electrode plate is then turned in the opposite direction and extended to form a slantingly installed electric connection plate, and a latch recess is stamped from a front end of the electric connection plate of the negative electrode plate, and the negative electrode plate is accommodated in the accommodating space of the housing, so that the electric connection plate of the negative electrode plate and the vertical wall enter into another latch slot, and the latch recess on the electric connection plate of the negative electrode plate is aligned precisely with the other wire plug slot, and the stop plate on the vertical wall of the negative electrode plate abuts against the latch slot wall to stop and position the negative electrode plate while a plate disposed on the negative electrode plate and at a position where the conductive bent portion is disposed extends downwardly and stays in the shallow groove of the housing. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a partial sectional side view of a conventional lampholder; 
         FIG. 2  is a top view of a conventional lampholder; 
         FIG. 3  is an exploded view of an embodiment of the present invention viewing from the top; 
         FIG. 4  is an exploded view of an embodiment of the present invention viewing from the bottom; 
         FIG. 5  is a sectional front view of an embodiment of the present invention; 
         FIG. 6  is a sectional side view of an embodiment of the present invention; 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The technical characteristics, contents, advantages and effects of the present invention will be apparent with the detailed description of a preferred embodiment accompanied with related drawings as follows. 
     With reference to  FIGS. 3 to 6  for an E26 wire-plugged bakelite lampholder  20  of an embodiment of the present invention, the E26 wire-plugged bakelite lampholder  20  comprises a housing  21 , an joint bracket  22 , a threaded ring  23 , a positive electrode plate  24  and a negative electrode plate  25 . 
     The housing  21  is made of a bakelite material and has an opening bottom inwardly penetrated to form an accommodating space  211  and two latch slots  212  symmetrically formed at the inner top of the housing  21  (as shown in  FIG. 6 ), and the top of the housing  21  is a solid wall, and a horizontal combining groove  213  is formed at the middle of the housing  21 , two wire plug slots  214  located in two sides of the housing  21  separately and a pair of the combining slots  215  located in front and rear ends of the combining groove  213  separately, and the combining slots  215  are provided with a latch step  216  (as shown in  FIG. 5 ). The positions of the wire plug slots  214  are correspondingly communicated with a latch slot  212  separately. In other words, each wire plug slot  214  is interconnected to a latch slot  212 , and a vertical shallow groove  217  is concavely formed on an internal wall of the housing  21  (as shown in  FIGS. 4 and 6 ). 
     The joint bracket  22  is made of a non-metal material, preferably with a bakelite material, mainly having a horizontal roof portion  221 , two elastic board parts  222  extended to both sides and a pair of the combining latch rods  223  located in the front and rear ends of the bottom of the roof portion  221  appearing to extend downwardly, and wherein the positions of the combining latch rods  223  are corresponded with the combining slots  215  one-on-one. 
     The threaded ring  23  is formed by a non-metal material, preferably with a bakelite material and mainly for a deep threaded notch formed on an internal wall of the housing  21  and integrally formed with the housing  21 . However, the threaded ring  23  is not formed at a position of the internal wall of the housing  21  where the shallow groove  217  is formed (as shown in  FIGS. 4 and 6 ). In other words, the threaded ring  23  breaks its extension at the position where the shallow groove  217  is situated and recurs after passing through the shallow groove  217 . 
     The positive electrode plate  24  is made of an electrically conductive material and has a conductive protruding portion  241  and makes an arc turn with an angle substantially equal to (or smaller than) 180° after being extended for a small section and then bent upwardly to form a vertical wall  242  after being extended for a small section, and a stop plate  243  is stamped on the vertical wall  242 , and an upper end of the vertical wall  242  is turned in an opposite direction and extended to form a slantingly installed electric connection plate  244 , and a latch recess  245  is stamped and formed at the front end of the vertical wall  242 . 
     The negative electrode plate  25  is made of an electrically conductive material and has a conductive bent portion  251  which is bent inwardly for a small section after being stretched upwardly, and then bent upwardly to form a vertical wall  252 , and a stop plate  253  is stamped and formed on the vertical wall  252 , and an upper end of the vertical wall  252  is turned in an opposite direction and extended to form a slantingly installed electric connection plate  254 , and a latch recess  255  is stamped and formed at a front end of the vertical wall  252 . 
     During assembling, the roof portion  221  of the joint bracket  22  is accommodated and positioned in the combining groove  213  of the housing  21 . Now, the combining latch rod  223  of the joint bracket  22  is inserted precisely into the combining slot  215  of the housing  21  one-on-one until the bottom end of each combining latch rod  223  has been corresponded and stuck with the latch step  216  of the combining slot  215 , so as to securely connect the joint bracket  22  with the housing  21 . Now, the two elastic board parts  222  of the joint bracket  22  are externally and slantingly extended to both sides of the housing  21  (as shown in  FIG. 5 ). 
     The positive electrode plate  24  is installed and accommodated in the accommodating space  211  of the housing  21 , and the electric connection plate  244  and the vertical wall  242  enter into one of the latch slots  212 . Now, the latch recess  245  of the electric connection plate  244  is aligned precisely with one of the wire plug slots  214 , and the stop plate  243  of the vertical wall  242  abuts at a recess formed on the wall of the latch slot  212  to stop the positive electrode plate  24  from separating in a downward direction. In the meantime, the conductive protruding portion  241  on the positive electrode plate  24  is extended to the center of the top of the accommodating space  211  (as shown in  FIG. 6 ). 
     The negative electrode plate  25  is installed and accommodated in the accommodating space  211  of the housing  21 , and the electric connection plate  254  and the vertical wall  252  enter into the other latch slot  212 . Now, the latch recess  255  of the electric connection plate  254  is aligned precisely with another wire plug slot  214 , and the stop plate  253  on the vertical wall  252  abuts at a recess formed on a wall of the latch slot  212  to stop the negative electrode plate  25  form separating in a downward direction. In the meantime, the plate with the conductive bent portion  251  of the negative electrode plate  25  extends downwardly and stays in the shallow groove  217  of the housing  21  (as shown in  FIG. 6 ). 
     When the E26 wire-plugged bakelite lampholder  20  is assembled into the accommodating slot at the top of the lamp body of a downlight, the elastic board parts  222  disposed on both sides of the joint bracket  22  are extended outwardly and coupled to a wall of the accommodating slot formed at the top of the lamp body, so that the E26 wire-plugged bakelite lampholder  20  is secured to the accommodating slot formed at the top of the lamp body. 
     After the E26 wire-plugged bakelite lampholder  20  is assembled with the lamp body to form a downlight, the whole downlight may be installed to a ceiling for use. The hard bare line sections of the two electrodes of a power line connected to the mains power may be plugged into the wire plug slots  214  respectively, and the bare line sections of the two electrodes of the power line touch the latch recess  245  of the positive electrode plate  24  and the latch recess  255  of the negative electrode plate  25  respectively, and then a force may be apply to press the bare line sections of the two electrodes of the power line into the wire plug slots  214  further, and the two bare line sections will press the electric connection plate  244  of the positive electrode plate  24  and the electric connection plate  254  of the negative electrode plate  25  to bent inwardly, so that the two bare line sections are in contact and scratch through the latch recesses  245 ,  255  to enter into the latch slots  212 . When the force is released, the resilience of the electric connection plates  244 ,  254  drives the latch recesses  245 ,  255  together with the walls of the latch slots  212  to clamp the two bare line sections securely, so that the electrodes of the power line connected to the mains power are electrically conducted with the positive electrode plate  24  and the negative electrode plate  25 , and the threaded joint screw of the light bulb of the cold light illumination series (such as a power saving fluorescent light bulb or an LED light bulb) enters into the threaded ring  23  until the top of the threaded joint reaches deeply into the conductive protruding portion  241  of the positive electrode plate  24 , so that the top of the threaded joint is electrically conducted with the positive electrode plate  24 . In the meantime, the threaded portion of the threaded joint is electrically conducted with the threaded ring  23  and the conductive bent portion  251  of the negative electrode plate  25 , so that the power saving fluorescent light bulb or the LED light bulb will be lit. 
     In summation of the description above, the E26 wire-plugged bakelite lampholder  20  of the present invention can be assembled and used easily, since the two electrodes of the power line can be plugged into the wire plug slots  214  through the bare line sections. Therefore, the E26 wire-plugged bakelite lampholder  20  can be installed without requiring any screw or rivet. Particularly, the joint bracket  22  and the housing  21  are made of a bakelite material, so that the manufacture is simpler and easier, and the combining groove  213  reserved on the housing  21  is provided for accommodating and positioning the roof portion  221  of the joint bracket  22  and further achieving to be stuck via the latch step  216  defined in the combining slot  215  corresponded with the combining latch rod  223  of the combining bracket  22  to make the assembling and operating processes more conveniently. In addition, the threaded ring  23  may be directly and integrally formed into the housing  21  to make the manufacturing and assembling processes more conveniently. 
     While the invention has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims.