Patent Publication Number: US-2019194986-A1

Title: Handle having airtightness function used for casing of negative pressure type dust collector

Description:
FIELD OF THE INVENTION 
     The present invention relates to a dust collector, and more particularly, to a handle having an airtightness function used for a casing of a negative pressure type dust collector. 
     BACKGROUND OF THE INVENTION 
     A conventional negative pressure type dust collector includes a casing. The casing is provided with a filter, a dust collection container and a blower therein. Wherein, one side of the casing is provided with an air inlet corresponding to the filter. The top of the casing is provided with an air outlet. The blower is located above the filter. The dust collection container is located under the filter. Through the running of the blower, the inside of the casing is in a negative pressure state, so that the air with dust is inhaled into the casing. The blower guides the air to pass through the filter, and the dust is adsorbed on the filter, and finally the air flows out through the air outlet, thereby purifying and filtering the air. When the dust collector is used for a period of time, a large amount of dust is adsorbed on the outer peripheral wall of the filter. Therefore, it is necessary to clean the filter. A backwash device is installed above the filter. The backwash device ejects a high-pressure gas towards the filter so that the dust is removed from the filter and falls into dust collection container. The filter can be cleaned quickly and conveniently. 
     One side of the casing of the conventional negative pressure type dust collector is provided with a door for the user to replace and maintain the filter, the dust collection container and the blower in the casing. The door is secured to the casing with a plurality of bolts. Therefore, when the backwash device instantaneously generates the high-pressure gas, the door is easily deformed to form a gap between the door and the casing to affect the negative pressure in the casing. When the backwash device ejects the high-pressure gas towards the filter, the dust will flow out through the gap between the door and the casing to result in secondary environmental pollution. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems. 
     SUMMARY OF THE INVENTION 
     The primary object of the present invention is to provide a handle having an airtightness function used for a casing of a negative pressure type dust collector to improve the airtight effect of the casing and prevent the door from being deformed due to backwash. The prevent invention can prevent the dust from flowing out through the gap between the door and the casing to cause secondary environmental pollution. 
     In order to achieve the aforesaid object, a handle of a casing of a negative pressure type dust collector is provided. One side of the dust collector is provided with a door. The handle is disposed on the door. The handle comprises two pivot seats, a rotating shaft, and two engaging blocks. The pivot seats are fixed to an outer side of the door and vertically aligned with each other. The pivot seats each include a first pivot member and a second pivot member. Two ends of the first pivot member are fixed to the door. A middle of a top surface of the first pivot member is formed with a recess. Two ends of the second pivot member are fixed to the two ends of the first pivot member. A middle of the second pivot member is formed with a groove. The groove is sleeved on the first pivot member. The rotating shaft is pivotally disposed between the recess and the groove of the two pivot seats. An outer peripheral wall of the rotating shaft is provided with two positioning rings corresponding to the pivot seats. The positioning rings abut against the two pivot seats, respectively. Two ends of the rotating shaft are provided with eccentric blocks, respectively. Each of the eccentric blocks has an extension portion extending along a tangent line thereof. An inner side of the extension portion is formed with a first contact surface. A middle portion of the rotating shaft is provided with an operating lever. The engaging blocks are fixed on the casing and vertically aligned with each other and located close to an outer periphery of the door. A top surface of each of the engaging blocks is provided with a hook. An inner side wall of the hook has a second contact surface. An inner side of the hook is formed with a pivot space. A bottom of each of the eccentric blocks is provided with a fixing seat for the engaging blocks to be fixed on the casing. 
     Through the handle of the casing of the negative pressure type dust collector provided by the present invention, the eccentric blocks of the rotating shaft are engaged with the engaging blocks so that the door is closely attached to the casing, thereby enhancing the airtight effect of the casing and preventing the door from being deformed due to backwash. The prevent invention can prevent the dust from flowing out through the gap between the door and the casing to cause secondary environmental pollution. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  a perspective view in accordance with a preferred embodiment of the present invention; 
         FIG. 2  a side view in accordance with the preferred embodiment of the present invention; 
         FIG. 3  is an exploded view of the handle of the present invention; 
         FIG. 4  is a schematic view of the present invention when in use, showing the rotating shaft to be disengaged from the operating lever fixing seat; 
         FIG. 5  is a schematic view of the present invention when in use, showing the rotating shaft before turned; 
         FIG. 6  is a schematic view of the present invention when in use, showing the rotating shaft to be unlocked; and 
         FIG. 7  is a schematic view of the present invention when in use, showing that the rotating shaft is unlocked to open the door. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings. 
     As shown in  FIG. 1  to  FIG. 3 , the present invention discloses a handle having an airtightness function used for a casing of a negative pressure type dust collector. The dust collector  200  comprises a casing  201 . A blower  202  is provided in the upper portion of the casing  201 . The top of the casing  201 , corresponding in position to the blower  202 , is provided with an air outlet  203 . The middle portion of the casing  201  is provided with a plurality of filters  204 . A plurality of dust collection containers  205  are provided under the filters  204 . One side of the casing  201  is provided with an air inlet  206  corresponding to the filters  204 . A backwash device  207  is provided above the filters  204 . Another side of the casing  201  is provided with a door  208 . A handle  100  is provided on the door  208 . The handle  100  comprises a rotating shaft  10 , two pivot seats  20 , two engaging blocks  30 , and an operating lever fixing seat  40 . 
     The rotating shaft  10  is disposed on the outer side of the door  208 . A pivot portion  11  radially extends from the middle of the rotating shaft  10 . The pivot portion  11  is pivotally connected with an operating lever  12 . Two ends of the rotating shaft  10  are provided with eccentric blocks  13 , respectively. Each eccentric block  13  has an extension portion  131  extending along a tangent line thereof. An inner side of the extension portion  131  is formed with a first contact surface  132 . The outer peripheral wall of the rotating shaft  10  is provided with two positioning rings  14 . 
     The two pivot seats  20  are fixed to the outer side of the door  208  and vertically aligned with each other. Each pivot seat  20  includes a first pivot member  21  and a second pivot member  22 . Wherein, two ends of the first pivot member  21  are fixed to the door  208 . The middle of the top surface of the first pivot member  21  is formed with a recess  211 . Two ends of the second pivot member  22  are fixed to the two ends of the first pivot member  21 . The middle of the second pivot member  22  is formed with a groove  221 . The groove  221  is sleeved on the first pivot member  21 , so that the rotating shaft  10  is pivotally disposed between the recess  211  and the groove  221 . The positioning rings  14  of the rotating shaft  10  abut against the respective sides of the pivot seats  20 , so that the rotating shaft  10  is positioned on the two pivot seats  20 . 
     The two engaging blocks  30  are fixed on the casing  201  and vertically aligned with each other, and are located close to the outer periphery of the door  208 . The top surface of each engaging block  30  is provided with a hook  31 . The inner side wall of the hook  31  has a second contact surface  311 . An inner side of the hook  31  is formed with a pivot space  312 . The engaging block  30  has an h-shaped cross section. A bottom plate  313  is provided below the pivot space  312 . When the eccentric block  13  of the rotating shaft  10  is disposed in the pivot space  312 , the bottom surface of the eccentric block  13  abuts against the top of the bottom plate  313 . In addition, one side of each engaging block  30 , facing the casing  201 , is provided with a fixing seat  32  fixed on the casing  201  by a bolt. 
     The operating lever fixing seat  40  includes a first fixing member  41  and a second fixing member  42 . Wherein, one end of the first fixing member  41  is fixed to the door  208 . Another end of the first fixing member  41  is a U-shaped plate with an opening facing upward so that the first fixing member  41  has an accommodation trough  411 . One end of the second fixing member  42  is pivotally connected to the first fixing member  41  for the accommodation trough  411  to be in a closed state, so that the operating lever  12  can be disposed in the accommodation trough  411 . 
     Referring to  FIG. 1  to  FIG. 3 , first, the rotating shaft  10  is rotated by the operating lever  12 , and the extension portions  131  of the eccentric blocks  13  are simultaneously turned to the pivot spaces  312  of the engaging blocks  30  so that the first contact surfaces  132  of the eccentric blocks  13  are pressed against the second contact surfaces  311  of the engaging blocks  30  for the door  208  to be closely attached to the casing  201 , thereby improving the airtight effect of the casing  201 . After that, the dust collector  200  can be started to run. The casing  201  of the dust collector  200  is in a negative pressure state, such that the air with dust can be inhaled into the casing  201  to perform the filtering operation. The dust filtering operation is the prior art and won&#39;t be described hereinafter. When the dust collector  200  is used for a period of time, the backwash device  207  will generate a high-pressure gas towards the filters  204  so that the dust on the filters  204  will fall down. When the backwash device  207  instantaneously generates the high-pressure gas, the handle  100  can hold the door  208  so that the door  208  is still closely attached to the casing  201 . 
     It is worth mentioning that when the dust collector  200  is used for a period of time, the door  208  may be deformed due to the instantaneous high-pressure gas generated by the backwash device  207 , so that a gap is formed between the door  208  and the casing  201 . The extension portions  131  of the eccentric blocks  13  are interlocked with the hooks  31  of the engaging blocks  30 , so that the rotating shaft  10  exerts a force to push the door  208  towards the casing  201 , enabling the door  208  to be closely attached to the casing  201  so as to reduce the gap between the door  208  and the casing  201 . In the case of a gas explosion generated in the casing  201 , the door  208  won&#39;t disengage from the casing  201  to cause damages to the surrounding objects and equipment or to injure the person. In addition, the prevent invention can prevent the dust from flowing out through the gap between the door  208  and the casing  201  to cause secondary environmental pollution. 
     Referring to  FIG. 4  and  FIG. 5 , when the dust collector  200  is used for a period of time, the blower  202 , the filters  204  and the backwash device  208  in the casing  201  need to be replaced or maintained. The operating lever  12  is pulled up to disengage the operating lever  12  from the operating lever fixing seat  40 , and then the rotating shaft  10  is driven to rotate by the operating lever  12 . As shown in  FIG. 6 , the operating lever  12  is turned clockwise to drive the rotating shaft  10  to rotate, meanwhile, the extension portions  131  of the eccentric blocks  13  are moved away from the pivot spaces  312  of the engaging blocks  30  and the first contact surface  132  and the second contact surface  311  are separated from each other. The state of tightening the door  208  is released. Referring to  FIG. 7 , the operating lever  12  is pulled outward to open the door  208 , such that the user can replace or maintain the dust collector  200  conveniently to prolong the service life. 
     It is worth mentioning that the operating lever fixing seat  40  is disposed in the vicinity of the rotating shaft  10 . When the eccentric blocks  13  are engaged with the engaging blocks  30 , the operating lever  12  is disposed on the operating lever fixing seat  40 . When the dust collector  200  is running or in the case of a gas explosion, the rotating shaft  10  won&#39;t be rotated because of vibration so as to ensure that extension portions  131  of the eccentric blocks  13  are engaged with the hooks  31  of the engaging blocks  30 . The door  208  is closely attached to the casing  201  to enhance the airtight effect of the casing  201 . 
     Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.