Abstract:
A box structure for electric switches provided with an opening to allow assembling of the requisite parts for the switch in the body, wherein, two engaging grooves are provided respectively on the two external lateral sides of the body, the engaging grooves cooperate with engaging portions provided on engaging pieces having engaging lobes integrally connected therewith. The engaging pieces are made of material with better resiliency than that for the body. The engaging lobes have beveled surfaces that are coarse surfaces in order to make firm connection after the box structure is engaged in a switch receiving seat. The box structure is different from that of conventional box structures in the mode of assembling, a user can individually change the damaged parts by detaching and reassembling, especially the lobes and their related parts in the box structure which have the largest damage rate. In this way, money can be saved, and the requirement of the environmental protection can be satisfied.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention is related to a box structure for electric switches, and especially to such a box structure wherein the parts thereof can be separately produced and assembled or changed for new ones. 
     2. Description of the Prior Art 
     A conventional electric switch structure is as shown in FIG. 1, in selling, the parts thereof are all sealed and packed in the body of the electric switch structure, only with a push button and a plurality of electric conductive pieces B of an internal electric circuit board exposed to the exterior of its body A. When the switch structure is mounted in a switch receiving seat, the conductive pieces B are connected to a given electric wire, turning on/off of the switch structure is controlled by pressing the push button. In general assembling, the body A of the switch is assembled and secured in a switch receiving seat  4  (referring to FIG.  4 ), wherein, the body A of the switch is provided on the mutually opposite lateral sides thereof each with a pair of elastic engaging pieces A 1  tilting outwardly which are formed integrally on each side of the body A of the switch. The upper ends of the engaging pieces A 1  are formed each an engaging lobe A 11  in the shape of “&gt;”, so that when the body A of the switch is put in the switch receiving seat  4  (referring to FIG.  4 ), the lower end with a smaller size of the body A of the switch can be smoothly put in, thereby the tilting engaging pieces A 1  can also be put in. The engaging lobes A 11  will be pressed to contract elastically, until the engaging lobes A 11  on the upper ends of the engaging pieces A 1  pass through the opening  41  of the switch receiving seat  4  (referring to FIG.  4 ). Then the engaging lobes A 11  spring apart to grasp the peripheral edges of the opening  41  for securing. If there is no switch receiving seat  4 , the body A of the switch can be directly placed in a hole in a wall panel  5  (referring to FIG. 5) to render the engaging lobes A 11  of the engaging pieces A 1  to grasp the inner wall of the hole (referring to FIG.  5 ), or the bottom periphery of all the sides of the body A of the switch is adhered to or locked on the surface of the wall panel  5  for securing. 
     However, the conventional electric switch structure has at least the following defects: 
     1. The engaging pieces are integrally formed with the body of the switch, hence material for them shall be identical, however, the engaging pieces provide elastic compression and stretching functions for grasping, they are subjected to breakage after multiple pressing actions. Once an engaging piece is broken, the switch must be wholly changed. This is wasteful in concerning money. 
     2. The parts are all sealed and packed in the body of the switch, damage of any part will be considered as damage of the whole assembly which allows no normal operation. Because the parts can not be detached individually for examination and change, the whole assembly shall be changed. 
     3. Except the waste of money which is also a waste of resource, the above stated two situations make burdens for the natural environment, and thereby do not meet the requirement of the environmental protection. 
     SUMMARY OF THE INVENTION 
     The present invention is an improvement in a box structure for electric switches, an object of the present invention is to provide a box structure for electric switches of which the body of the switch and the engaging pieces thereof can be separately produced and assembled, the engaging pieces can be made of material with better resiliency and tenacity, so that the whole box structure can have larger engaging strength. 
     The second object of the present invention is to provide a box structure for electric switches; wherein, the body of the switch, the cover and the engaging pieces are all separately produced and assembled. If some parts are damaged during assembling and disassembling, they can be changed individually, and waste can be avoided. This meets the requirement of economy. 
     The third object of the present invention is to provide a box structure for electric switches; wherein, the body of the switch has an assembling opening to allow assembling of the related parts in the body; the opening then is fixedly covered with a cover. When any part is damaged, it can be detached for examination and changing, it is no necessity to change the whole switch, hence money can be saved, and the requirement of the environmental protection is satisfied. 
     Based on the above statement, the box structure for electric switches of the present invention is provided with an assembling opening to allow assembling of the requisite parts for the switch in the body, and two engaging grooves are provided respectively on the two external lateral sides of the body, the engaging grooves cooperate with engaging portions provided on two engaging pieces having engaging lobes integrally connected therewith. The engaging pieces are made of material with better resiliency than that for the body of the switch. The engaging lobes have beveled surfaces that are coarse knurled grasping surfaces in order to make firm connection after the box structure is connected with a switch receiving seat. 
     The present invention will be apparent in its features, objects as well as functions after reading the detailed description of the preferred embodiments thereof in reference to the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view showing the appearance of a conventional box structure for electric switches; 
     FIG. 2 is an analytic perspective view of the present invention; 
     FIG. 3 is a perspective view of the present invention after assembling; 
     FIG. 4 is a sectional view showing the present invention is mounted in a switch receiving seat; 
     FIG. 5 is a perspective view of the second embodiment of the present invention; 
     FIG. 6 is an analytic perspective view of the third embodiment of the present invention; 
     FIG. 7 is an analytic perspective view of the fourth embodiment of the present invention; 
     FIG. 8 is an analytic perspective view of the fifth embodiment of the present invention; 
     FIG. 9 is an analytic perspective view of the sixth embodiment of the present invention; 
     FIG. 10 is an analytic perspective view of the seventh embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     As shown in FIGS. 2 and 3 which are respectively an analytic perspective view of the present invention and a perspective view after assembling of the present invention, the box structure for electric switches provided by the present invention is comprised of: 
     A body  1  of an electric switch, being provided with an opening to allow assembling of the requisite parts for the switch, the upper surface thereof is provided with a push button  11 . The body  1  of the electric switch is further provided on the upper portions of the mutually opposite lateral sides thereof with two engaging grooves  12  each with an upper opening  121  and each being provided on the bottom of an outer lateral side thereof with a positioning hole  13 . 
     Two engaging pieces  2 , being made of material with better resiliency and tenacity, the bottom of each engaging piece  2  is an engaging portion  21  in the shape of a lengthy post and having a positioning protrusion  24  with a beveled surface and on the external side near the bottom of the engaging piece  2 . The engaging portion  21  connects with an engaging neck  22  which in turn connects with an upper engaging lobe  23  in the shape of “&gt;”. The engaging lobe  23  has an upper beveled surface that is a coarse knurled grasping surface  231 . 
     A cover  3 , the cover  3  is provided for covering the opening of the body  1 . 
     When in assembling, the engaging portions  21  of the engaging pieces  2  are embedded in the engaging grooves  12  of the body  1 , the engaging necks  22  of the engaging pieces  2  are thereby led into the upper openings  121  and abutted tightly each against two beveled surfaces  122  at both sides of each upper opening  121 . When the positioning protrusions  24  reach the positioning holes  13 , the engaging pieces  2  are completely and tightly combined with the body  1  in position. 
     When the related parts for the body  1  are assembled in the body  1 , the cover  3  is put on and assembled on the opening of the body  1 . In this embodiment, the way of connecting can be adhering or hot melting; and the connecting step of the cover  3  with the body  1  can be done before or after assembling of the engaging pieces  2 . 
     Referring again to FIG. 4 which is a sectional view showing the present invention is mounted in a switch receiving seat, generally, after assembling of the above mentioned box structure for electric switches, the body  1  is inserted into the switch receiving seat  4  smoothly due to its smaller size, the engaging pieces  2  are pressed to contract elastically and are inserted into the switch receiving seat  4  through the opening  41  of the switch receiving seat  4 , then the engaging lobes  23  on the upper portions of the engaging pieces  2  pass through the opening  41  of the switch receiving seat  4  to spring apart to render the coarse knurled grasping surface  231  on the engaging lobes  23  to grasp the lower corners on the edges of the opening  41  for securing. 
     By all means, it is possible that a wall may have no switch receiving seat  4 , then the body  1  of the switch can be directly placed in a hole in the wall panel  5  to render the engaging lobes  23  of the engaging pieces  2  to grasp the inner wall of the hole of the wall panel  5 , or the bottom periphery of all the sides of the body  1  of the switch is adhered to or locked on the surface of the wall panel  5  for securing. 
     Referring to FIG. 5 which is an analytic perspective view of the second embodiment of the present invention, wherein, the body  1  of the switch is provided on the mutually opposite lateral sides thereof each with a pair of plate like members extending from the bottom outwardly and then upwardly to a predetermined height and turn back to the body  1  of the switch to form therebetween a pair of vertical engaging grooves  12 . A lengthy positioning hole  13  is provided on each lateral wall of the body  1  of the switch internally of the lower portion of its corresponding engaging groove  12 . The lower portion of each of the engaging pieces  2  is a rectangular engaging portion  21  corresponding to an engaging groove  12 , and the engaging piece  2  is provided near the inside bottom thereof with a positioning protrusion  24  with a beveled surface in cooperating with the lengthy positioning hole  13 . The engaging piece  2  is integrally provided thereon with an upper engaging lobe  23  in the shape of “&gt;”. The engaging lobe  23  has an upper beveled surface that is a coarse knurled grasping surface  231 . 
     When in assembling, the engaging portions  21  of the engaging pieces  2  are placed in through the lower opening of the engaging grooves  12  of the body  1 . When the positioning protrusions  24  of the engaging pieces  2  reach the positioning holes  13 , the beveled surfaces on the positioning protrusions  24  can thereby be engaged with the positioning holes  13 , so that the engaging pieces  2  are tightly combined with the body  1  in position. The connecting step of assembling the cover  3  and assembling of the box structure for electric switches with the switch receiving seat  4  are the same as that of the aforementioned first embodiment. 
     Referring to FIG. 6 which is an analytic perspective view of the third embodiment of the present invention, wherein, the body  1  of the switch is provided on both lateral sides thereof with an engaging groove  12  at an upper position close to the middle level thereof and opened at both ends. The engaging pieces  2  each has an engaging portion  21  in the shape of “U”, the engaging portion  21  has two clamping arms  211  orthogonally extending from the two ends of the base thereof. The clamping arms  211  are provided on the ends thereof respectively with a positioning protrusion  24 . The engaging portion  21  connects with an engaging neck  22  which in turn connects with an upper engaging lobe  23  in the shape of “&gt;”. The engaging lobe  23  has an upper beveled surface that is a coarse knurled grasping surface  231 . The cover  3  is provided near the upper portion of each lateral edge thereof corresponding to the position of an engaging groove  12  with a clamping groove  123  with an opened end. The closed end of the clamping groove  123  is provided with a positioning hole  13  cooperating with one of the positioning protrusions  24 . The body  1  of the switch is provided on the rear side thereof in opposition to the side juxtaposing the cover  3  with the same kind of clamping grooves  123  and positioning holes  13  (not shown). 
     When in assembling, the related parts for the body  1  are assembled in the body  1  in the first place, then the cover  3  is put on the opening of the body  1  to align the clamping grooves  123  with the engaging grooves  12 , and the clamping arms  211  of the engaging pieces  2  are inserted and pushed along the opened end of the clamping grooves  123 , until the positioning protrusions  24  on the clamping arms  211  are engaged in the corresponding positioning holes  13  for positioning. At this time, the engaging portions  21  of the engaging pieces  2  are tightly engaged in the engaging grooves  12 . Thereby, the third embodiment of the box structure for electric switches of the present invention is completed. 
     Referring to FIG. 7 which is an analytic perspective view of the fourth embodiment of the present invention, wherein, the body  1  of the switch is provided on the upper side thereof with a push button  11 , and on the mutually opposite lateral sides thereof each with an engaging groove  12  opened at one end, the closed end of the engaging groove  12  has a positioning hole  13 . The cover  3  is provided at the level corresponding to that of either of the engaging grooves  12  with a clamping groove  123 . The engaging portions  21  as the lower portions of an engaging piece  2  are integrally connected with a connecting section  212  to form a “U” shape. The free ends of the engaging portions  21  are provided each with a positioning protrusion  24 . The engaging portions  21  are provided thereon each with an engaging lobe  23  having an upper beveled surface that is a coarse knurled grasping surface  231 . 
     When in assembling, the cover  3  covers the opening of the body  1 , and the two engaging portions  21  of the engaging piece  2  are inserted and pushed through the opened ends of the engaging grooves  12 , until the positioning protrusions  24  are engaged in the corresponding positioning holes  13  for positioning. At this time, the connecting section  212  is tightly engaged in the clamping groove  123 , and assembling is completed. 
     Referring to FIG. 8 which is an analytic perspective view of the fifth embodiment of the present invention, wherein, the body  1  of the switch is just the same as that of the first embodiment, the difference is that, the engaging pieces  2  and the cover  3  in the first embodiment are integrally combined in the present embodiment, and a small section of strengthening protrusion  31  is extended from the location near the top of each edge of the cover  3  to strengthen the cover  3 . When in assembling the box structure for electric switches, the external surfaces of the strengthening protrusions  31  abut tightly against the upper lateral walls of the body  1  in order to get firmer assembling. 
     Referring to FIG. 9 which is an analytic perspective view of the sixth embodiment of the present invention, wherein, the body  1  of the switch is provided on the upper surface thereof with a push button  11 , and is provided on the mutually opposite lateral sides thereof each with a protruding stop strip  14 , a positioning hole  13  is provided parallelly near each of the protruding stop strips  14 . Two engaging pieces  2  have their lower rectangular sheet portions integrally connected with a cover  3  respectively with their end edges, the free end edges of the rectangular sheet portions are provided each with a positioning protrusion  24  pointing inwardly. 
     When in assembling, the positioning protrusions  24  of the engaging pieces  2  are placed in the positioning holes  13  of the body  1 , the positioning protrusions  24  are tightly abutted against the protruding stop strips  14 , so that assembling of the sixth embodiment of the box structure for electric switches of the present invention can be surely completed. 
     Referring to FIG. 10 which is an analytic perspective view of the seventh embodiment of the present invention, wherein, the body  1  of the switch is provided on the upper surface thereof with a push button  11 , while the mutually opposite lateral sides thereof are not provided with the engaging grooves  12  as stated in the aforementioned embodiments. Wherein, the cover  3  is provided on the surface thereof with a plurality of wedge like positioning protrusions  24 , the rear side of the body  1  in opposition to the opening of the body  1  of the electric switch also has a plurality of positioning protrusions  24  corresponding in position to those on the cover  3  (not shown). An engaging piece  2  is provided; the lower portion thereof is a rectangular hollow engaging portion  21  with the top and bottom thereof opened. A plurality of positioning holes  13  are provided on the cover  3  and the body  1  at the positions corresponding to the positioning protrusions  24  respectively, the engaging portion  21  is provided as the upper portion thereof with two mutually opposite engaging lobes  23  each being in the shape of “&gt;”, each of the engaging lobes  23  has a beveled surface that is a coarse knurled grasping surface  231 . 
     When in assembling, the cover  3  is assembled on the opening of the body  1 , then the cover  3  and the body  1  are together put in the hollow engaging portion  21  of the engaging piece  2  to engage the positioning protrusions  24  into corresponding ones of the positioning holes  13 . Positioning of the members and assembling of the seventh embodiment of the box structure for electric switches of the present invention can be thus completed. 
     In the above stated second and seventh embodiments (FIGS. 5,  10 ), the connecting methods, steps and effects in assembling switch receiving seats  4  or wall panels  5  are the same as that of the aforementioned first embodiment. 
     At least several advantages as listed below can be obtained by providing the improved box structure for electric switches of the present invention: 
     1. The engaging pieces and the body of the switch are separately produced and assembled, the engaging pieces which are subjected to pressing force repeatedly can be made of material with better resiliency and tenacity, so that the whole assembly produced can have better strength and durability. 
     2. A box structure for an electric switch is provided wherein the body of the switch, the cover and the engaging pieces are all separately produced and assembled, during assembling and disassembling, the parts being damaged can be individually changed, and this is economic because waste can be avoided. 
     3. A box structure for an electric switch is provided wherein the body of the switch has an assembling opening to allow assembling of the related parts in the body, the opening then is fixedly covered with a cover. When any part is damaged, it can be detached for examination and changing, it is no necessity to change the whole switch, hence money can be saved, and the requirement of the environmental protection is satisfied. 
     The aforesaid is only for illustrating a preferred embodiment of the present invention, and not for giving any limitation to the scope of the present invention. Various modifications or changes can be made to the elements of the present invention without departing from the spirit, scope and characteristic of this invention and thus fall within the scope of the appended claims and are intended to form part of this invention.