Abstract:
A cutting saw machine has a motor arranged to be installed in a table frame which is used for supporting the cutting table and the coolant tray instead of mounted on the cutting head, so that the cutting head thereof can be made of light material to reduce the overall weight of the machine. Moreover, the motor is positioned below the coolant tray that can prevent direct contact with the user, and that the coolant tray also provides a cool surrounding to the motor that can help the motor to reduce its heat when it is functioning.

Description:
FIELD OF THE PRESENT INVENTION 
     The present to invention relates to a ceramic and masonry saw, and more particularly to a cutting saw machine having its motor installed in the cutting table instead of mounting on the cutting head so as to reduce the overall size and weight of the machine for easy operation, carry and storage. 
     BACKGROUND OF THE PRESENT INVENTION 
     Referring to FIG. 1, a conventional cutting saw machine as illustrated is commonly used in the construction industry for shaping and cutting masonry tiles and the like, made from materials such as granite, marble, slate, ceramics, paver, and brick. The traditional cutting saw machine  10  as shown in FIG. 1 includes a cutting table  11  supported on a floor standing frame  12 , a cutting head  13  overhanging the cutting table  11  with a circular diamond saw blade  14  which is powered by an electric motor  15 . The electric motor  15  is directly mounted on the cutting head  13  for driving the saw blade  14  to rotate through a transmission means  16 . 
     Besides, liquid coolant that is circulated by pump is usually used to cool the saw blade  14  and work piece and to flush away sawdust. Although such conventional cutting saw machine substantially provides desirable features that include achieving precise and accurate cuts, ease of replacement of the blade when it is worn, rapid adjusting of the saw blade to various positions to permit complex cuts, ease of emptying the tray positioned underneath the saw blade, and etc., the conventional cutting saw still contains the following shortcomings. 
     1. The motor  15  is positioned above the cutting table  11  and the cutting head  13  supports the heavy weight of the motor  15 . Therefore, the cutting head  13  must be made of strong material such as cast iron or steel alloy to rigidly support the heavy motor  15 . The motor supporting cutting head  13  is heavy in weight that also increases the weight of the cutting saw machine. 
     2. The conventional cutting saw machine  10  as shown in FIG. 1 is more difficult to transport and operate due to the fact that the major portion of the weight of the whole cutting saw machine  10  is its upper part, including the motor  15 , the cutting head  13 , and the cutting table  11 . In other words, the conventional cutting saw machine  10  has an unstable structure, i.e. a heavier upper head and a lighter lower support base, that may easily lose balance. 
     3. The user must be very carefully to prevent any body contact with the hot motor  15  exposed above the cutting table  11  to avoid unwanted body injury when the motor  15  is functioning during operation of the cutting saw machine. 
     SUMMARY OF THE PRESENT INVENTION 
     The main object of the present invention is to provide a cutting saw machine that has a motor installed in a table frame which is used for supporting the cutting table and the coolant tray, so that the cutting head thereof can be made of light material to reduce the overall weight of the machine. 
     Another object of the present invention is to provide a cutting saw machine that has a more stable structure that is more easily to transport and operate, because the major weight of the machine is distributed in the table frame where receives the motor and the coolant tray. 
     Another object of the present invention is to provide a cutting saw machine wherein the motor is positioned below the coolant tray that can prevent direct contact with the user, and that the coolant tray also provides a cool surrounding to the motor that can help the motor to reduce its heat when it is functioning. 
     Another object of the present invention is to provide a cutting saw machine, which contains an additional supporting, means to rotatably support the saw blade above the cutting table thereof. 
     Accordingly, in order to accomplish the foregoing objects, the present invention provides a cutting saw machine comprising: 
     a table frame; 
     a cutting table attached on the table frame; 
     a supporting frame, which is attached to the table frame, having a transmission chamber; 
     a cutting head having a proximal end and a distal end, wherein the cutting head is supported above of the cutting table by attaching the proximal end to the supporting frame; 
     a bearing housing assembly, which is disposed in the cutting head, having an output end and an input end which is extended to an upper position inside the transmission chamber of the supporting frame; 
     a circular saw blade positioned at the distal end of the cutting head and connected to the output end of the bearing housing assembly; 
     a motor mounted in the table frame having a driving shaft extended to a lower position inside the transmission chamber of the supporting frame; 
     a transmitting means disposed in the transmission chamber of the supporting frame for transmitting power outputting from the motor to the input end of the bearing housing assembly so as to drive the saw blade to rotate above the cutting table; and 
     a coolant tray which is supported in the table frame and is disposed beneath the cutting table and above the motor. 
     Moreover, the coolant tray also forms a motor cavity indented thereunder for receiving the motor therein so as to reduce the size of the cutting saw machine and to provide cooling effect around the motor that also generates heat when functioning. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an elevation view of a conventional cutting saw machine. 
     FIG. 2 is an exploded perspective view of a cutting saw machine with floor standing frame according to a preferred embodiment of the present invention. 
     FIG. 3 is a perspective view of a cutting saw machine according to the above preferred embodiment of the present invention. 
     FIG. 4 is a perspective view of the table frame of the cutting saw machine according to the above preferred embodiment of the present invention. 
     FIG. 5 is a top view of the cutting saw machine according to the above preferred embodiment of the present invention. 
     FIG. 6 is a side view of the cutting saw machine according to the above preferred embodiment of the present invention. 
     FIG. 7 is a side view of the cutting saw machine with the coolant tray pulling out according to the above preferred embodiment of the present invention. 
     FIG. 8 is a side view of a first alternative mode of the cutting saw machine according to the above preferred embodiment of the present invention. 
     FIG. 9 is side view of a second alternative mode of the cutting saw machine according to the above preferred embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring FIGS. 2 to  7  of the drawings, a cutting saw machine according to a preferred embodiment of the present invention is illustrated, which comprises a table frame  20 , a cutting table  30 , a supporting frame  40 , a cutting head  50 , a bearing housing assembly  60 , a circular saw blade  6 , a motor  70 , a transmitting means  80 , and a coolant tray  90 . 
     As shown in FIGS. 2 to  4 , the table frame  20  comprises a bottom frame  21 , four construction posts  22 ,  23 ,  24 ,  25  upwardly extended from four corners of the bottom frame  21 , a sliding rail  26  connected between two construction posts  23 ,  25  attached to a first side of the bottom frame  21 , and a supporting rail  27  which is parallel to the sliding rail  26  and connected between another two construction posts  22 ,  24  attached to a second side of the bottom frame  21 . 
     As shown in FIGS. 2,  3  and  5 , the cutting table  30  is slidably mounted on the table frame  20 . The cutting table  30  comprises a work table  31  sitting across the sliding rail  26  and the supporting rail  27  of the table frame  20 , and a sliding arrangement  32  for enabling the work table  31  to slide along the sliding rail  26  and the supporting rail  27 . 
     As shown in FIGS. 2,  3  and  4 , the supporting frame  40 , which is vertically attached to the table frame  20 , has a bottom end  41  and a top end  42 , wherein the bottom end  41  is firmly affixed to the first side of the bottom frame  21  of the table frame  20 . A transmission chamber  43  is defined inside the supporting frame  40 . 
     The cutting head  50  comprises a head frame  51  having a proximal end  511  and a distal end  512 , wherein the cutting head  50  is horizontally supported above of the cutting table  30  by integrally affixed the proximal end  511  of the head frame  51  to the top end  42  of the supporting frame  40 . As shown in FIGS. 2 and 6, below the head frame  51 , the bearing housing assembly  60  is rigidly secured thereto. The bearing housing assembly  60  has an output end  61  and an input end  62  which is extended to an upper position inside the transmission chamber  43  of the supporting frame  40 . As shown in FIGS. 2 and 6, the circular saw blade  6  which is positioned at the distal end  512  of the head frame  51  of the cutting head  50  is connected to the output end  61  of the bearing housing assembly  60 . 
     As shown in FIGS. 2,  3 ,  5 , and  6 , the cutting head  50  further comprises a controlling head  52  mounted on the head frame  51  for covering the head frame  51  and the bearing housing assembly  60  secured thereunder. Other electrical controlling means  521  such as circuit control, fuse and controlling switch are installed therein for controlling the operation of the machine. A blade protective shell  53 , which is in semi-circular shape, has a connecting end  531  pivotally connected to a rear end of the controlling head  52  for normally covering a top portion of the saw blade  6 . The blade protective shell  53  can be upwardly rotated with respect to the connecting end  531  for replacing the saw blade  6  when it is worn out. 
     As shown in FIGS. 2 and 4, the motor  70  is firmly mounted on the bottom frame  21  of the table frame  20 , wherein the motor  70  is aligned in parallel with the cutting head  50  so as to extend a driving shaft  71  of the motor  70  into a lower position of the transmission chamber  43  of the supporting frame  40 , as shown in FIG. 4, according to the preferred embodiment of the present invention. In order to protect the motor  70 , a motor protective housing  72  is used for covering the motor  70 , wherein the motor protective housing  72  comprises a motor shell  721  attached to the bottom frame  21  to cover the motor  70  and an end cover  722  attached to a distal end of the motor shell  721 . 
     In view of the foregoing disclosure, the input end  62  of the bearing housing assembly  60  and the driving shaft  71  of the motor  70  are respectively extended to the upper and lower positions inside the transmission chamber  43 . As shown in FIG. 2, the transmitting means  80  is disposed in the transmission chamber  43  of the supporting frame  40  for transmitting power outputting from the motor  70  to the input end  62  of the bearing housing assembly  60  so as to drive the saw blade  6  to rotate above the cutting table  30 . 
     As shown in FIG. 2, the transmission means  80  comprises a first transmitting wheel  81  and a second transmitting wheel  82  rotatably connected to the driving shaft  71  of the motor  70  and the input end  62  of the bearing housing assembly  60  inside the transmission chamber  43 , and an endless transmitting member  83  disposed inside the transmission chamber  43  for connecting the first transmitting wheel  81  with the second transmitting wheel  82 . According to the preferred embodiment as shown in FIG. 2, the transmitting member  83  is a transmitting belt and the first and second transmitting wheels  81 ,  82  are two belt pulleys. 
     As shown in FIGS. 2 and 4, the transmission means  80  further comprises a belt tension adjusting unit  84 , which is installed inside the transmission chamber  43  of the supporting frame  40 , for maintaining the transmitting tension of the belt-type transmitting member  83 . The belt tension adjusting unit  84  comprises a pressure pulley  841 , which is supported in the transmission chamber  43  to press against the belt-type transmitting member  83 . The belt tension adjusting unit  84  further comprises a supporting bridge  842  extended across the transmission chamber  43 , wherein an inclined Z-shaped hole  843  is provided on the supporting bridge  842 , so that the user may adjust the pressure applied to the transmitting member  83  by locking the pressure pulley  841  at different positions of the Z-shaped hole  843  so as to adjust the transmitting tension of the transmitting member  83 . 
     It should be understood that two chain gears can substitute the two belt pulleys when a transmitting chain is used as the transmitting member  83 . In other words, the transmitting member  83  is adapted for connecting the driving shaft  71  of the motor  70  with input end  62  of the bearing housing assembly  60  so that the motor can drive the saw blade  6  to rotate through the power transmission of the driving shaft  71 , the transmission means  80  and the bearing housing assembly  60 . 
     The coolant tray  90  is supported in the table frame  20  and disposed beneath the cutting table  30  and above the motor  70 . As shown in FIGS. 2 to  7 , the coolant tray  90  has a size equal to or slightly smaller than the bottom frame  21  and a depth slightly smaller than the distance between the bottom frame  21  and the sliding rail  26  and the supporting rail  27 . The coolant tray  90  is placed on the bottom frame  21  and guided by the sliding rail  26  and supporting rail  27 , as shown in FIGS. 3 and 5. Inclined surfaces  91  are provided at two ends of the coolant tray  90  for facilitating coolant circulation. Moreover, a bottom side of the coolant tray  90  defines a motor cavity  92  which has a size fitting to receive the motor  70  therein when the coolant tray  90  is sat on the bottom frame  21 , so that the top, front, rear, and right sides of the motor  70  are substantially surrounded by the coolant tray  90 . In other words, the coolant tray  90  can also provide a cooling effect for the motor  70  located thereunder to dissipate the heat generated from the motor  70  when it is functioning. 
     As shown in FIG. 7, the coolant tray  90  can also be pulled out from the table frame  20  for cleaning or replacing the liquid coolant therein. 
     As shown in FIGS. 2 and 4, liquid coolant is filled in the coolant tray  90  and is circulated by a fluid pump  93  that is disposed in the cooling tray  90  to cool the cutting saw  6  and work piece and to flush away saw dust. 
     The cutting saw machine of the present invention as shown in FIG. 3 can be simply placed on a worktable of the user. However, as shown in FIG. 2, the cutting saw machine of the present invention may further comprises a floor standing frame  28  which includes four standing legs  281 ,  282 ,  283 ,  284  respectively connected with the four construction posts  22 ,  23 ,  24 ,  25  for supporting the machine on floor. During transpiration or storage, the user may detach the four standing legs  281  to  284  by pulling them out from four construction posts  22  to  25  to save space. 
     Referring to FIG. 8, a first alternative mode of the preferred embodiment is illustrated, wherein an additional saw blade supporting means  54 ′ is used to reinforce the supporting of the saw blade  6 ′. The additional saw blade supporting means  54 &#39;s comprises a L-shaped supporting arm  541 ′ having a top end supporting saw blade  6 ′ and a bottom end pivotally connected to the second side of the bottom frame  21  of the table frame  20 . As shown in FIG.  9 . when a larger tile needs to be cut, the additional saw blade supporting means  54 ′ further comprises a supporting bar  542  supported and extended between the saw blade  6 ′ and the top end of the supporting arm  541 . 
     According to the above disclosure, the following advantages can be concluded over prior arts. 
     First, the overlapping of the coolant tray  90  with the motor  70  can reduce the size of the cutting saw machine for easy storage and transportation. Practically, the cutting saw machine of the present invention, with the four standing legs detached, can even be fitted into a car trunk. 
     Second, due to the fact that the bottom frame  21  of the table frame  20  must has a strong construction for supporting the coolant tray  90  and the liquid coolant therein, therefore the motor  70  can be well supported by affixing on the bottom frame  21 . In other words, according to the present invention, the supporting frame  40  and the head frame  51  of the cutting head  50  only need to support the bearing housing assembly  60  and the saw blade  6  but do not need to support the heavy motor anymore. Therefore, both the supporting frame  40  and the cutting head  50  can be constructed by light material that can largely reduce the weight of the cutting saw machine. In fact, for the same cutting power, a conventional cutting saw machine as shown in FIG. 1 normally weight 100 to 110 lbs. but the present invention as shown in FIG. 3 has a weight of 50 to 60 lbs. only. 
     Third, since the motor is placed under the coolant tray  90 , so that the coolant tray  90  can collect any coolant spilling or dropping down, so that the drawback of the conventional cutting saw machine that the liquid coolant that may spill on the motor affixed on top of the cutting head can thus be avoided. 
     Fourth, an unexpected cooling effect for the motor  70  is achieved in the present invention. The liquid coolant in the coolant tray  90  is used for heat dissipation and the motor will generate heat during function. For the conventional machine, the coolant does nothing to the hot motor. However, according to the present invention, the motor  70  is surrounded by the coolant tray  90  wherein the liquid coolant in the coolant tray  90  may help dissipating the heat generated from the motor, so as to prolong the service life span of the motor. 
     Fifth, the cutting saw machine of the present invention is more easily to assemble since it is easier to affix the heavy motor  70  on the large bottom frame  21  than to mount on the small cutting head. The manufacturing cost of the present invention is also lower by eliminating the strong, heavy and expensive construction of the cutting head framework. 
     Sixth, the risk of the user being burnt by the heat of the motor of the prior art is eliminated because the motor  70  of the present invention is stored under the coolant tray  90 .