Patent Publication Number: US-2022234123-A1

Title: Hand-held band saw

Description:
RELATED APPLICATION INFORMATION 
     This application is a continuation of International Application Number PCT/CN2020/125275, filed on Oct. 30, 2020, through which this application also claims the benefit under 35 U.S.C. § 119(a) of Chinese Patent Application No. 201911042736.4, filed on Oct. 30, 2019, Chinese Patent Application No. 201911042739.8, filed on Oct. 30, 2019, Chinese Patent Application No. 201911042715.2, filed on Oct. 30, 2019, and Chinese Patent Application No. 201911042738.3, filed on Oct. 30, 2019, all of which are incorporated herein by reference in their entirety. 
    
    
     BACKGROUND 
     At present, the hand-held band saw is widely used, and can be used to cut all machinable metals including the stainless steel, pipes, solid bodies and the like. The hand-held band saw has a strong thermal resistance, wear resistance and vibration resistance, and has a longer service life compared with similar products. Because of its flexible and convenient use, the hand-held band saw has been widely used in scenarios of cutting various types of bars, pipes and profiles in industry and home. 
     To facilitate cutting, a supporting member for supporting the workpiece is disposed on a cutting side edge of the workpiece cut by the saw blade. When cutting, the user can support the cut workpiece by adjusting the height of the supporting member, but the supporting member configured on the band saw products on the market needs an external tool when adjusting the height, which is insufficient in convenience and experience of use. 
     On the other hand, during the running process of the tool, the supporting member falls or collides with the object rigidly, resulting in the stress collapse, enabling the supporting member to return to an original position, or directly leading to the damage of the supporting member, thereby affecting the working efficiency. 
     SUMMARY 
     A hand-held band saw includes: a housing assembly, a first rotation wheel, a second rotation wheel, a motor. The housing assembly includes a first housing, a second housing spaced from the first housing, and a third housing connecting the first housing to the second housing, where a cutting area is formed between the first housing and the second housing. The first rotation wheel is at least partially disposed on the first housing. The second rotation wheel is at least partially disposed on the second housing. The motor is disposed in the housing assembly and is capable of driving one of the first rotation wheel and the second rotation wheel to rotate. The hand-held band saw further includes: an supporting device. The supporting device is connected to the first housing and is at least partially disposed in the cutting area. The supporting device includes: a fixing member, a slider, a supporting member, a connection assembly and a buffer member. The fixing member is fixedly connected to the first housing. The slider is slidably connected to the fixing member. The supporting member is connected to the slider. The connection assembly connects the slider and the supporting member. When the slider moves, the connection assembly is capable of enabling the supporting member to move along with the slider. The buffer member is mounted between the slider and the supporting member. 
     A hand-held band saw includes: a housing assembly, a first rotation wheel, a second rotation wheel, a motor. The housing assembly includes a first housing, a second housing spaced from the first housing, and a third housing connecting the first housing to the second housing, where a cutting area is formed between the first housing and the second housing. The first rotation wheel is at least partially disposed on the first housing. The second rotation wheel is at least partially disposed on the second housing. The motor is disposed in the housing assembly and is capable of driving one of the first rotation wheel and the second rotation wheel to rotate. The hand-held band saw further includes: an supporting device. The supporting device is connected to the first housing and is at least partially disposed in the cutting area. The supporting device includes: a fixing member, a slider, a supporting member, a connection assembly and a buffer member. The fixing member is fixedly connected to the first housing. The slider is slidably connected to the fixing member. The supporting member is connected to the slider. The connection assembly connects the slider and the supporting member. When where the slider moves, the connection assembly is capable of enabling the supporting member to move along with the slider. The control assembly is mounted to the slider; and the control assembly is connected to the fixing member and is configured to prevent the slider from disengaging from the fixing member. 
     A hand-held band saw includes: a housing assembly, a first rotation wheel, a second rotation wheel, a motor. The housing assembly includes a first housing, a second housing spaced from the first housing, and a third housing connecting the first housing to the second housing, where a cutting area is formed between the first housing and the second housing. The first rotation wheel is at least partially disposed on the first housing. The second rotation wheel is at least partially disposed on the second housing. The motor is disposed in the housing assembly and is capable of driving one of the first rotation wheel and the second rotation wheel to rotate. The hand-held band saw further includes: an supporting device. The supporting device is connected to the first housing and is at least partially disposed in the cutting area. The supporting device includes: a fixing member, a slider, a supporting member, a connection assembly and a buffer member. The fixing member is fixedly connected to the first housing. The slider is slidably connected to the fixing member. The supporting member is connected to the slider, and is capable of being released and fixedly connected to the fixing member. The buffer member is mounted between the slider and the supporting member. The supporting member is capable of being driven to move between a first position and a second position in a first sliding direction, the supporting member is capable of being released and fixed at any one position between the first position and the second position, when the supporting member is fixed at any one position and moves to a third position under a force, the buffer member is capable of generating a buffer force opposite to a moving direction, and the buffer force is capable of enabling the supporting member to return to the any one position from the third position. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a three-dimensional structural view of a hand-held band saw in a second direction; 
         FIG. 2  is a three-dimensional structural view of the hand-held band saw as shown in  FIG. 1  in a first direction; 
         FIG. 3  is a three-dimensional structural view of the hand-held band saw as shown in  FIG. 1  from another perspective; 
         FIG. 4  is a three-dimensional structural view of a back of the hand-held band saw as shown in  FIG. 1 ; 
         FIG. 5  is a structural view illustrating that an supporting device of the hand-held band saw as shown in  FIG. 1  is in a second position; 
         FIG. 6  is a front view of the hand-held band saw as shown in  FIG. 1 ; 
         FIG. 7  is a structural view of a first guide mechanism and a second guide mechanism of the hand-held band saw as shown in  FIG. 1 ; 
         FIG. 8  is a structural view illustrating that an auxiliary handle of the hand-held band saw as shown in  FIG. 1  is at an intermediate position of the handle; 
         FIG. 9  is a structural view illustrating that the auxiliary handle of the hand-held band saw as shown in  FIG. 1  is in a first extreme position; 
         FIG. 10  is a structural view illustrating that the auxiliary handle of the hand-held band saw as shown in  FIG. 1  is in a second extreme position; 
         FIG. 11  is a structural view illustrating that the supporting device of the hand-held band saw as shown in  FIG. 1  is in a first position; 
         FIG. 12  is a sectional view taken along an A-A direction of  FIG. 11 ; 
         FIG. 13  is a structural view illustrating that the supporting device of the hand-held band saw as shown in  FIG. 1  is in an intermediate position; 
         FIG. 14  is a structural view illustrating that the supporting device of the hand-held band saw as shown in  FIG. 1  is in a second position; 
         FIG. 15  is a structural view illustrating that the supporting device of the hand-held band saw as shown in  FIG. 1  is in a state of stress collapse; 
         FIG. 16  is a partial enlarged view of  FIG. 1 ; 
         FIG. 17  is a partial enlarged view of  FIG. 2 ; 
         FIG. 18  is a partial enlarged view of  FIG. 3 ; 
         FIG. 19  is a partial enlarged view of  FIG. 4 ; 
         FIG. 20  is a partial enlarged view of  FIG. 7 ; 
         FIG. 21  is a partial enlarged view of  FIG. 7 ; 
         FIG. 22  is an exploded view of the auxiliary handle of the hand-held band saw as shown in  FIG. 1 ; 
         FIG. 23  is a structural view of an actuating device of the hand-held band saw as shown in  FIG. 20 ; and 
         FIG. 24  is a sectional view taken along a B-B direction of  FIG. 21 . 
     
    
    
     DETAILED DESCRIPTION 
     To clearly illustrate the technical solution of the present application, front and rear as shown in  FIG. 1  are defined. 
     Referring to  FIG. 1 , an example of the present application provides an electric tool, specifically, a hand-held band saw  100 , which can be mounted with a saw blade  180  and drive the saw blade  180  to move so as to achieve the function of cutting a workpiece. 
     Referring to  FIGS. 1 to 4 , the hand-held band saw  100  of the present application includes: a housing assembly  110 , a first rotation wheel  116 , a second rotation wheel  117 , a motor  200 , a handle  120 , a saw blade  180  and a battery pack  135 . 
     The housing assembly  110  forms an accommodation space for accommodating various parts inside the hand-held band saw  100 . The housing assembly  110  includes a first housing  111 , a second housing  112  and a third housing  113 . The first housing  111  is spaced from the second housing  112 , the third housing  113  connects the first housing  111  and the second housing  112 , and the third housing  113 , the first housing  111  and the second housing  112  are fixedly connected or integrally formed. A cutting area  114  is formed between the first housing  111  and the second housing  112 . The first housing  111  is formed with a first housing surface  1112 , and the second housing  112  is formed with a second housing surface  1122 . The handle  120  is connected to the housing assembly  110  and configured for the user to grip. Both ends of the handle  120  are fixedly connected to the first housing surface  1112  and the third housing  113  respectively. Of course, both ends of the handle  120  may also be integrally formed with the first housing surface  1112  and the third housing  113  respectively. 
     The motor  200  is configured to provide a power source to the hand-held band saw  100  and is at least partially disposed within the housing assembly  110 . 
     A first rotation wheel  116  and a second rotation wheel  117  are at least partially disposed within the accommodation space. The first rotation wheel  116  and the second rotation wheel  117  are disposed on a lower side of the first housing surface  1112  and a lower side of the second housing surface  1122  respectively. The handle  120  is located on an upper side of the first housing surface  1112 , and the motor  200  is able to drive the first rotation wheel  116  and/or the second rotation wheel  117  to rotate. That is, the motor  200  drives the first rotation wheel  116  to rotate, or the motor  200  may drive the second rotation wheel  117  to rotate, or of course, the motor  200  may drive the first rotation wheel  116  and the second rotation wheel  117  to rotate. In this example, the first rotation wheel  116  is disposed in the first housing  111 , the second transmission wheel  117  is disposed in the second housing  112 , and the motor  200  drives the first rotation wheel  116  to rotate with respect to the first housing  111  about a first central axis  101 . That is, the first rotation wheel  116  is configured to transmit power output by the motor  200  to the saw blade  180 . 
     The saw blade  180  is connected to the first rotation wheel  116  and the second rotation wheel  117 . That is, when the first rotation wheel  116  transmits the power output by the motor  200  to the saw blade  180 , the saw blade  180  drives the second rotation wheel  117  to rotate with respect to the second housing  112  about the second central axis  102 . 
     The battery pack  135  is mounted to the housing assembly  110  and is configured to provide an energy source to the hand-held band saw  100 . In this example, the battery pack  135  is installed on the third housing. Specifically, the battery pack  135  has a connection port which is cooperated with a connection seat disposed on the third housing  113  to achieve the energy transmission. 
     The saw blade  180  connects the first rotation wheel  116  and the second rotation wheel  117 . 
     Referring to  FIGS. 1, 11 to 15 , the hand-held band saw  100  also includes an supporting device  140  connected to the housing assembly  110 . Specifically, the supporting device  140  is connected to the first housing  111  and is at least partially disposed in the cutting area  114 . The supporting device  140  includes a fixing member  141 , a slider  142 , a supporting member  143  and a connection assembly  144 . The fixing member  141  is fixedly connected to the first housing  111 . In this example, the fixing member  141  is provided with multiple through holes  1411  through which screws are fixed to the first housing  111 . The slider  142  is slidably connected to the fixing member  141 , that is, it can be understood that the slider  142  is capable of reciprocating with respect to the fixing member  141  in a first sliding direction a. The supporting member  143  is configured to abut against the cut workpiece. The supporting member  143  is connected to the slider  142  through the connection assembly  144 , and the connection assembly  144  is fixedly connected to the slider  142 , that is, it can be understood that when the slider  142  moves, the supporting member  143  is able to move with the slider  142  so that the supporting member  143  is in different positions in the first sliding direction a, and a height of the supporting member  143  is adjusted by the slider  142  to cooperate with different workpieces. 
     The supporting device  140  further includes a control assembly  145 . The control assembly  145  is configured to drive the slider  142  to move the supporting member  143  which, when moving in the first sliding direction a, is able to move to at least two positions. That is, the supporting member  143  is able to move a first position and a second position separately, and is able to move between the first position and the second position. Of course, there may also be one or multiple intermediate positions between the first position and the second position according to different working conditions. Specifically, the control assembly  145  drives the slider  142  to move the supporting member  143  between the first position and the second position, or to keep the supporting member  143  at the first position, the second position, or the intermediate position. The fixing member  141  is provided with multiple grooves  1412 . The control assembly  145  includes an operation member for a user to operate, the operation member is a control button  1451 , a stopper  1452  and an elastic member  1453 . The elastic member  1453  is connected to the control button  1451 . In this example, the elastic member  1453  may be a spring. The control button  1451  is configured to be operated by the user. When the control button  1451  is in an original state and the stopper  1452  is cooperated with the groove  1412 , the supporting member  143  is relatively fixed at a certain position among the intermediate positions the first position, or the second position. The original state refers to a state of the control button  1451  when the spring is unstressed to be deformed. When the user presses the control button  1451 , the stopper  1452  is disengaged from the groove  1412 , and the slider  142  is able to move freely with respect to the fixing member  141 . When the control button  1451  loses the external force, the control button  1451  is able to be restored to the original state under the action of the elastic member  1453 . Specifically, the control button  1451  and the stopper  1452  are integrally formed and rotated about the rotary axis  103 . In some examples, the control button  1451  may also be fixedly connected to the stopper  1452  and rotated about the rotary axis  103 . In this example, in a case where the supporting member  143  is in the first position, on the premise that the stopper  1452  is clamped with the groove  1412 , the supporting member  143  is kept at a position closest to the third housing  113  in the first sliding direction a. In a case where the supporting member  143  is in the second position, on the premise that the stopper  1452  is clamped with the groove  1412 , the supporting member  143  is kept at a position farthest from the third housing  113  in the first sliding direction a, in this case, the supporting member  143  is configured to cooperate with the workpiece having a large size. The intermediate position refers to a position between the first position and the second position and where the stopper  1452  is clamped with the groove  1412  (as shown in  FIG. 13 ). In this application, the intermediate position is not forcibly defined between the first position and the second position, and the stopper  1452  may also be disengaged from the groove  1412  when the supporting member  143  is at the intermediate position. When the user presses the control button  1451 , the user may adjust the supporting member  143  to any one position of the intermediate positions, the first position, or the second position. Therefore, the height of the supporting member  143  may be adjusted by changing a corresponding relation between the control button  1451  and different grooves  1412  without the assistance of the external tool, which is more convenient and experiential. 
     Referring to  FIG. 15 , in a case where the supporting member  143  is in the intermediate position and the hand-held band saw  100  is accidentally dropped, the supporting member  143  contacts the ground or other objects, the supporting member  143  is subjected to a relatively large external force, and the supporting member  143  moves in a direction facing toward the third housing  113  in the first sliding direction a, that is, the supporting member  143  moves from the intermediate position to a third position, thereby avoiding the direct rigid collision between the supporting member  143  and the ground or other objects, and further avoiding the drop damage of the hand-held band saw  100 . When the supporting member  143  is in the third position and the external force applied to the supporting member  143  disappears, the connection assembly  144  is able to generate a buffer force opposite to a moving direction so as to move the supporting member  143  from the third position to the intermediate position, thereby avoiding that the user adjusts the supporting member  143  again and improving the operation convenience. The third position is between the first position and the second position. The third position refers to the farthest position at which the supporting member  143  can move from the intermediate position toward the third housing  113  when a relatively large external force is applied. Since the magnitude of the external force applied each time is uncertain, the specific position of the third position is uncertain. 
     The connection assembly  144  includes a buffer member  1441  for resetting the supporting member  143 . The buffer member  1441  is disposed between the slider  142  and the supporting member  143  and disposed in a direction parallel to the first sliding direction a. Specifically, the slider  142  has an accommodation slot  1421  and a connection portion  1422 . The connection portion  1422  is disposed on one side of the accommodation groove  1421 . The buffer member  1441  is at least partially disposed in the accommodation groove  1421 . One end of the buffer member  1441  is connected to the connection portion  1422 , and the other end of the buffer member  1441  is connected to the supporting member  143 . Since the buffer member  1441  is provided, when the supporting member  143  falls or rigidly collides with the object and contracts, the supporting member  143  may slide to a certain extent in a contraction direction, thereby achieving the purpose of preventing the supporting member from falling and the control assembly  145  from falling and being damaged. 
     The connection assembly  144  also includes a guide rod  1442  disposed in a first direction and fixedly connected to the slider  142  such that the guide rod  1442  can move along with the slider  142  when the slider  142  moves. Specifically, a pin may be used to connect the slider  142  and one end of the guide rod  1442 . Of course, the guide rod  1442  and the slider  142  are fixedly connected in other means. For example, external threads are provided on one end of the guide rod  1442 , internal threads are provided in the connection portion  1422 , and the guide rod  1442  and the connection portion  1422  are threadedly connected. The other end of the guide rod  1442  is movably connected to the supporting member  143  for limiting the supporting member  143  from being disengaged from the guide rod  1442  and moving freely. The supporting member  143  is provided with a protrusion  1431 . The protrusion  1431  extends in a direction perpendicular to the first sliding direction a, and the other end of the guide rod  1442  passes through the protrusion  1431  and cooperates with the pin so that the protrusion  1431  cannot be disengaged from the guide rod  1442 . In this application, the buffer member  1441  may specifically be a spring sleeved on the guide rod  1442 . One end of the spring abuts against the guide rod  1442  and the other end of the spring abuts against the protrusion  1431 . The improved supporting device  140  has advantages of simple structure, low production cost and convenient operation. 
     Referring to  FIGS. 1 to 5 , the hand-held band saw  100  also includes a first guide mechanism  150  and a stop mechanism  170 . The first guide mechanism  150  is configured to guide the saw blade  180  to move in a first cutting direction b within the cutting area  114 . The stop mechanism  170  is configured to prevent the saw blade  180  from passing over a predetermined position, avoiding that the saw blade  180  is unable to cut normally, and supporting the saw blade  180  so as to ensure the normal operation of the machine. 
     The first guide mechanism  150  is connected to the housing assembly  110 . The first guide mechanism  150  includes a first guide assembly  151  and a second guide assembly. Specifically, the first guide assembly  151  is mounted to the first housing  111  and the second guide assembly  152  is mounted to the second housing  112 . The first guide assembly  151  and the second guide assembly  152  are cooperated with each other so that the saw blade  180  is moved in the first cutting direction b within the cutting area  114 . 
     When the hand-held band saw  100  works, that is, when the saw blade  180  in the cutting area  114  moves in the first cutting direction b, the saw blade  180  moves from a first cutting position to a second cutting position, and the stop mechanism  170  stops the saw blade  180  from passing over the second cutting position. The first cutting position refers to a position at which the saw blade  180  is mounted on the first guide mechanism  150 . The second cutting position refers to the predetermined position, i.e., a position at which the saw blade  180  can move on the first guide mechanism  150  under the action of the stop mechanism  170  and closest to the stop mechanism  170 . In actual use, the first cutting position is not fixed. Of course, there is a case where the first cutting position coincides with the second cutting position, that is, an initial position of the saw blade  180  on the first guide mechanism  150  is the second cutting position at which the saw blade  180  is located. The above design is used for preventing the saw blade  180  from continuously shifting when moving so as to prevent the saw blade  180  from passing over the second cutting position, ensure the normal use of the hand-held band saw  100 , and avoid that the disengagement of the saw blade  180  causes the equipment failure, affects the normal operation of the equipment, increases the cost of the subsequent repairment and maintenance, and slows down the working efficiency. 
     Referring to  FIGS. 16 and 17 , the stop mechanism  170  includes a first stopper  171  and a second stopper  172 . The first stopper  171  is connected to the first housing  111  and is rotatable about a first rotary axis  104 , and the second stopper  172  is connected to the second housing  112  and is rotatable about a second rotary axis  105  parallel to the first rotary axis  104 . When the saw blade  180  is at the second cutting position, that is, when the saw blade  180  is in contact with the first stopper  171  and the saw blade  180  is also in contact with the second stopper  172 , at least part of the saw blade  180  at a position in contact with the first stopper  171  intersects a direction of the first rotary axis  104 , and at least part of the saw blade  180  at a position in contact with the second stopper  172  intersects a direction of the second rotary axis  105 , that is, it can be understood that the saw blade  180  at the position where the first stopper  171  is in contact with the saw blade  180  intersects the direction of the first rotary axis  104 , and the saw blade  180  at the position where the second stopper  172  is in contact with the saw blade  180  intersects the direction of the second rotary axis  105 . Similarly, the saw blade  180  at the position where the first stopper  171  is in contact with the saw blade  180  is also perpendicular to the direction of the first rotary axis  104 , and the saw blade  180  at the position where the second stopper  172  is in contact with the saw blade  180  is perpendicular to the second rotary axis  105 . As an optional example, the saw blade  180  includes a saw back  181 , a saw edge (not shown in the figure), a first side surface (not shown in the figure), and a second side surface  182 . The saw back  181  is disposed opposite to the saw edge for cutting the workpiece, the first side surface is disposed opposite to the second side surface  182 , and the first side surface is at least partially in contact with the first guide mechanism  150 . When the saw blade  180  is in the second cutting position, the saw back  181  is at least partially in contact with the first stopper  171 ; in this case, the second side surface  182  at the position where the saw back  181  is in contact with the first stopper  171  is substantially parallel to a first surface  1711  of the first stopper  171 , the saw back  181  is at least partially in contact with the second stopper  172 , and the second side surface  182  at the position where the saw back  181  is in contact with the second stopper  172  is also substantially parallel to a second surface  1721  of the second stopper  172 . In this way, the machine can be better kept running stably. As another optional example, when the saw blade  180  is in the second cutting position, the saw back  181  is at least partially in contact with the first stopper  171  and a plane passing through the first stopper  171  and perpendicular to the first rotary axis  104  is substantially parallel to the second side surface  182  at the position where the saw back  181  is in contact with the first stopper  171 , the saw back  181  is in contact with the second stopper  172  and a plane passing through the second stopper  172  and perpendicular to the second rotary axis  105  is substantially parallel to the second side surface  182  at the position where the saw back  181  is in contact with the second stopper  172 . 
     The hand-held band saw  100  also includes a second guide mechanism  160  configured to guide the saw blade  180  to move in a second cutting direction within the cutting area  114 , and the second guide mechanism  160  is connected to the housing assembly  110 . Specifically, the second guide mechanism  160  includes a third guide assembly  161  and a fourth guide assembly  162 . The third guide assembly  161  is connected to the first housing  111 , the fourth guide assembly  162  is connected to the second housing  112 , and the third guide assembly  161  and the fourth guide assembly  162  cooperate with each other to enable the saw blade  180  to move in the second cutting direction c within the cutting area  114 . A set of guide mechanisms is added, so that the user can adjust the assembly mode as needed in the actual operation, and the hand-held band saw  100  has different cutting paths. In a special case where the conventional hand-held band saw  100  cannot cut or is inconvenient to cut, the cutting path is changed to change the angle of the saw blade  180  so as to ensure the cutting operation is performed smoothly. 
     The first rotation wheel  116  and the second rotation wheel  117  are disposed substantially symmetrically with respect to a plane P 2  passing through the cutting area  114 . The first housing  111  and the second housing  112  are disposed substantially symmetrically with respect to the plane P 2 . The first guide assembly  151  and the second guide assembly  152  are disposed substantially symmetrically with respect to the plane P 2 , the third guide assembly  161  and the fourth guide assembly  162  are disposed substantially symmetrically with respect to the plane P 2 , and the first stopper  171  and the second stopper  172  are disposed substantially symmetrically with respect to the plane P 2 . 
     Referring to  FIGS. 6, 7, 20 and 21 , the first guide assembly  151  includes a first guide member  1511  and the second guide assembly  152  includes a second guide member  1521 . The first guide member  1511  rotates about a first rotation axis  106  and the first rotation axis  106  intersects the first rotary axis  104 . Since the first guide assembly  151  and the second guide assembly  152  are disposed substantially symmetrically with respect to the plane P 2 , the second guide member  1521  rotates in a direction parallel to the first rotation axis  106 , and the first rotation axis  106  intersects the second rotary axis  105 . Preferably, the first rotation axis  106  is perpendicular to the first rotary axis  104  so as to facilitate the machining of the machine. The third guide assembly  161  includes a third guide member  1611  and a fourth guide member  1612 . The third guide member  1611  rotates about a second rotation axis  107 , the fourth guide member  1612  is adjacent to the third guide member  1611 , and the fourth guide member  1612  rotates about a direction substantially parallel to the second rotation axis  107 . The saw blade  180  is disposed between the third guide member  1611  and the fourth guide member  1612 . The fourth guide assembly  162  includes a fifth guide member  1621  and a sixth guide member  1622 . The fifth guide member  1621  and the third guide member  1611  are disposed substantially symmetrically with respect to the plane P 2  and the fifth guide  1621  is rotatable in the direction substantially parallel to the second rotation axis  107 . The sixth guide member  1622  is disposed adjacent to the fifth guide member  1621 , the sixth guide member  1622  and the fourth guide member  1612  are disposed substantially symmetrical with respect to the plane P 2 , the sixth guide member  1622  is rotatable in the direction substantially parallel to the second rotation axis  107 , and the saw blade  180  is disposed between the fifth guide member  1621  and the sixth guide member  1622 . The first rotation axis  106  and the second rotation axis  107  intersect and form a preset angle α. When cutting the workpiece, the saw blade  180  is generally inclined to facilitate cutting in a gravity direction or in a direction intersecting the gravity direction, that is, the saw blade  180  moves in the second cutting direction c within the cutting area  114 . The second rotation axis  107  substantially coincides with the second cutting direction c. In practice, however, in order to facilitate cutting the workpiece intersecting or even perpendicular to the gravity direction, the saw blade  180  moves in the first cutting direction b within the cutting area  114 . The first rotation axis  106  substantially coincides with the first cutting direction b. The first rotation axis  106  and the second rotation axis  107  intersect and form a preset angle α which is less than or equal to 90 degrees. In this example, the preset angle a ranges from 20 degrees to 55 degrees, preferably, from 30 degrees to 45 degrees. 
     The first guide mechanism  150  and the second guide mechanism  160  are connected to an intermediate connection assembly  190  which is fixedly connected to the housing assembly  110 . Specifically, the intermediate connection assembly  190  includes a first intermediate connection portion  191  and a second intermediate connection portion  192 . The first guide assembly  151  and the second guide assembly  152  are mounted to the first intermediate connection portion  191  and the second intermediate connection portion  192  respectively. The first intermediate connection portion  191  and the second intermediate connection portion  192  are mounted to the first housing  111  and the second housing  112  respectively. The third guide assembly  161  and the fourth guide assembly  162  are mounted to the first intermediate connection portion  191  and the second intermediate connection portion  192  respectively. More specifically, the first intermediate connection portion  191  may be fastened to the first housing  111  with screws, and the second intermediate connection portion  192  may also be fastened to the second housing  112  with the screws. The stop mechanism  170  is connected to the intermediate connection assembly  190 , and the first stopper  171  and the second stopper  172  are connected to the first intermediate connection portion  191  and the second intermediate connection portion  192  respectively. 
     As another optional example, as shown in  FIG. 8 , the first housing  111  includes a first extension portion  1111 , the second housing  112  includes a second extension portion  1121 . The first stopper  171  and the second stopper  172  are connected to the first extension portion  1111  and the second extension portion  1121  respectively, and the first guide mechanism  150  and the second guide structure  160  are connected to the intermediate connection assembly  190 . Specifically, the first guide assembly  151  and the second guide assembly  152  are mounted to the first intermediate connection portion  191  and the second intermediate connection portion  192  respectively. The third guide assembly  161  and the fourth guide assembly  162  are mounted to the first intermediate connection portion  191  and the second intermediate connection portion  192  respectively. 
     Specifically, the first guide member  1511 , the second guide member  1521 , the third guide member  1611 , the fourth guide member  1612 , the fifth guide member  1621 , the sixth guide member  1622 , the first stopper  171  and the second stopper  172  are all rolling bearings. The first guide member  1511 , the third guide member  1611  and the fourth guide member  1612  are fitted to the first intermediate connection portion  191  by the screws, and the second guide member  1521 , the fifth guide member  1621  and the sixth guide member  1622  are fitted to the second intermediate connection portion  192  by the screws. 
     Referring to  FIGS. 1 to 6 , the hand-held band saw  100  also includes an auxiliary handle  130  for the user to grip. The auxiliary handle  130  is rotationally connected to the housing assembly  110 . In this example, the auxiliary handle  130  is rotationally connected to the second housing  112 , and of course, the auxiliary handle  130  may also be rotationally connected to the third housing  113 . Specifically, the auxiliary handle  130  includes a first gripping portion  131 , a second gripping portion  132  spaced from the first gripping portion  131 , a third gripping portion  133 , an auxiliary gripping portion  134 , a coupling portion  136  and an extension portion  137 . The third gripping portion  133  connects one end of the first gripping portion  131  and one end of the second gripping portion  132 , the coupling portion  136  connects the other end of the first gripping portion  131  and the other end of the second gripping portion  132 , the extension portion  137  is connected to one end, adjacent to the coupling portion  136 , of the first gripping portion  131 , the auxiliary gripping portion  134  is connected to the extension portion  137 , and the auxiliary gripping portion  134  is located on an upper side of the second housing surface  1122 . According to the above arrangement, when the hand-held band saw  100  is operated, the user can place the palm of the hand gripping the auxiliary handle  130  on the auxiliary gripping portion  134 . Such way can not only maintain the stability of the body of the hand-held band saw  100  and prevent the case of the uneven cutting of the workpiece caused by the body waging from side to side, but also place the hand originally placed on the auxiliary handle on the auxiliary gripping portion, and release the gripping hand, so that the operation is much easier and labor-saving. 
     The auxiliary gripping portion  134  is fixedly connected or integrally formed with the extension portion  137 , that is, the auxiliary gripping portion  134  is rotatable with respect to the housing assembly  110 . In the specific operation, the user holds the handle  120  with one hand and laps the other hand on the auxiliary gripping portion  134 , and the hand on the handle  120  controls an actuating device  220  to start the hand-held band saw  100  for the cutting work. According to the actual operation position of the cut workpiece, the user can adjust the operation in real time. The auxiliary gripping portion  134  is added on the structure of the auxiliary handle  130 , so that the user can remove the arm that originally applied a force to the auxiliary handle  130  when cutting the workpiece, and thus avoiding the case where the arm blocks the sight, in particular, the case where the workpiece to be cut is in a relatively low position, the user needs to bend over to operate, and thus the arm of the hand gripping the auxiliary handle  130  can easily block the visual field of the user, thereby affecting the cutting accuracy of the user. 
     The handle  120  is disposed symmetrically with respect to the plane P 1 , and extension directions of the first gripping portion  131  and the second gripping portion  132  are both substantially parallel to the plane P 1 . An angle intersected by the plane P 1  and the first housing surface  1112  ranges from 135 degrees to 155 degrees, preferably, from 140 degrees to 150 degrees. The plane P 1  of the handle is substantially parallel to the second cutting direction c, that is, when the user operates the hand-held band saw  100  to cut the workpiece in the second cutting direction c, an extension direction of the handle  120  is consistent with the gravity direction of the machine at this time, thereby increasing the user&#39;s sense of experience and enabling the hand-held band saw  100  to be operated smoothly and cut normally. 
     The handle  120  includes a handle operation portion  126  for the user to operate the hand-held band saw  100 . The hand-held band saw  100  has a preset plane P 3 , the first housing surface  1112  and the second housing surface  1122  are at least partially located in a preset plane P 3 , and a distance D 1  from the handle  120  to the preset plane P 3  in a direction perpendicular to the preset plane P 3  is greater than a distance D 2  from the auxiliary gripping portion  134  to the preset plane P 3  in the direction perpendicular to the preset plane P 3 . The auxiliary gripping portion  134  is disposed on an upper side of the preset plane P 3  and on a lower side of the handle operation portion  126 . When the user grips the handle operation portion  126  with one hand, the other hand previously gripped the auxiliary handle  130  now can grip the auxiliary gripping portion  134  which is lower than the handle operation portion  126 . In this case, when the user grips the hand-held band saw  100 , the height of the machine can be lowered, the gravitational potential energy of the machine in the gravity direction can be lowered, and the user is in a relatively labor-saving state. 
     The user gripping the auxiliary gripping portion  134  also gives an auxiliary force to the body of the hand-held band saw  100  from a side direction, which is much easier and labor-saving for the user in operation, and does not need to lift or lower the body. The user may choose to hold a gripping top surface  1345  of the auxiliary gripping portion  134  to maintain the stability of the body; and may also lift the machine body from a gap between the auxiliary gripping portion  134  and the second housing surface  1122  to maintain the stability of the machine body and complete the machining operation. Based on the design of the structure of the auxiliary gripping portion  134 , the original force applied vertically is changed into an auxiliary supporting force from the side, which is more conducive to maintaining the stability of the body of the hand-held band saw  100  during the cutting and preventing the case of the uneven cutting of the workpiece caused by the vibration of the machine during the cutting. 
     Referring to  FIGS. 6, 9, 10, 18 and 19 , the auxiliary gripping portion  134  includes a first gripping side  1341 , a second gripping side  1342  and a gripping bottom surface  1346 . The first gripping side  1341  is disposed adjacent to the second gripping side  1342 , and an extension portion  137  of the auxiliary handle  130  has one extension end which is fixedly connected or integrally formed with a part of the first gripping side  1341  adjacent to the second gripping side  1342 , which is conductive to machining. The second housing surface  1122  has a central surface  1123  extending within a preset plane P 3 . The auxiliary handle  130  is rotatable about the rotation axis  108 , a first extreme position and a second extreme position exist during the rotation of the auxiliary handle  130 . The first extreme position is a position at which the auxiliary handle  130  is in contact with the second housing  112  (as shown in  FIG. 9 ). The second extreme position is a position at which the auxiliary handle  130  is in contact with the battery pack  135  (as shown in  FIG. 10 ), and at least one intermediate position of the handle (as shown in  FIG. 6 ) exists between the first extreme position and the second extreme position such that the gripping bottom surface  1346  is substantially parallel to the central surface  1123  of the second housing surface  1122 . As another example, the gripping bottom surface  1346  of the auxiliary gripping portion  134  is partially within a gripping plane P 4 . It can also be understood that the gripping bottom surface  1346  is not a plane and may be in other shapes. The gripping bottom surface  1346  is partially within the gripping plane P 4 , that is, the gripping plane P 4  rotates along with the auxiliary gripping portion  134 , and the first extreme position and the second extreme position also exist in the gripping plane P 4  during the rotation. An intermediate position of the handle exists between the first extreme position and the second extreme position, so that the gripping plane P 4  is substantially parallel to the central surface  1123  of the second housing surface  1122 . 
     The hand-held band saw  100  further includes a tension assembly  115  for adjusting a position of the saw blade  180  so as to maintain a reasonable tension during the operation of the saw blade  180  and ensure the normal operation of the machine. The tension assembly  115  includes a switch knob  1151  which is rotationally connected to the second housing  112  and is disposed between the second housing surface  1122  and the auxiliary gripping portion  134  so as to prevent the switch knob  1151  from contacting the auxiliary gripping portion  134  during the rotation. More specifically, the switch knob  1151  has a top surface  1152 . When the auxiliary handle  130  is at the intermediate position of the handle, a minimum distance from the gripping bottom surface  1346  of the auxiliary gripping portion  134  to the second housing surface  1122  in the direction perpendicular to the preset plane P 3  is greater than a maximum distance from a top surface  1152  of the switch knob  1151  to the second housing surface  1122  in the direction perpendicular to the preset plane P 3 , which is convenient for the user to grip the auxiliary gripping portion  134  to keep the body stable, and can also leave a sufficient gap for the user to lift the auxiliary gripping portion  134  and the switch knob  1151  to complete the cutting operation. 
     When the auxiliary handle  130  is at the intermediate position of the handle, a length H from the gripping bottom surface  1346  to the central surface  1123  in the direction perpendicular to the preset plane P 3  ranges from 28 mm to 70 mm during which the hand of the user does not touch the switch knob  1151 , so that when the auxiliary gripping portion  134  is gripped, the switch knob  1151  cannot be unusable, thereby improving the user experience. 
     Referring to  FIGS. 2, 6, 18 and 19 , the auxiliary gripping portion  134  also includes a third gripping side  1343  disposed opposite to the first gripping side  1341 , a fourth gripping side  1344  disposed opposite to the second gripping side  1342 , and a gripping top surface  1345  connected to the first gripping side  1341 , the second gripping side  1342 , the third gripping side  1343 , and the fourth gripping side  1344 , and the gripping top surface  1345  is disposed opposite to the gripping bottom surface  1346 . The extension end is at least partially connected to the gripping top surface  1345 . When the auxiliary handle  130  is at the intermediate position of the handle, the first gripping side  1341 , the second gripping side  1342 , the third gripping side  1343  and the fourth gripping side  1344  are substantially perpendicular to the preset plane P 3 , and the gripping top surface  1345  is approximately arc-shaped, so that when the hand-held band saw  100  is used by the user, it can be well fitted to the palm of the user, improving the user experience. Of course, we can understand that the gripping top surface  1345  and the gripping bottom surface  1346  of the auxiliary gripping portion  134  are both planar. As another example, the gripping top surface  1345  and the gripping bottom surface  1346  may not be planar. For example, the gripping bottom surface  1346  is configured to be concave to facilitate the user&#39;s grip, and the gripping top surface  1345  is convex to facilitate placing the user&#39;s palm. With the above design, the auxiliary gripping portion  134  may be a hexahedron, which facilitates the machining. In this example, the auxiliary gripping portion  134  is a hexahedron, and of course, the auxiliary gripping portion  134  may be in other shapes. 
     Joints of the four gripping sides are arc angles, which can improve the comfort of user when gripping. A rubber anti-slip layer is arranged on the gripping top surface  1345  of the auxiliary gripping portion  134 , and the arrangement of the rubber anti-slip layer is more beneficial to improving the operation feeling of the user in the cutting operation. When the rubber layer is not provided on the user&#39;s operating glove, the rubber anti-slip layer on the gripping top surface  1345  can effectively prevent the user&#39;s hand from slipping off 
     Referring to  FIGS. 1 to 4 , the hand-held band saw further includes the actuating device  220  for driving the motor  200 , and the actuating device  220  is disposed adjacent to the handle operation portion  126 . Specifically, referring to  FIGS. 22 to 24 , the actuating device  220  includes a switch assembly  221 , a first pressing member  222  and a second pressing member  223 . The switch assembly  221  is coupled to the motor  200  and the switch assembly  221  is configured to control whether the motor  200  is actuated or not. The first pressing member  222  is configured to control the switch assembly  221  and the second pressing member  223  is configured to control the switch assembly  221 . That is to say, the first pressing member  222  and the second pressing member  223  may control the switch assembly  223  separately, thereby actuating the motor  200 . 
     The first pressing member  222  is movably connected to the handle  120 . The first pressing member  222  during the movement has at least a first actuating position for actuating the motor  200  and a first stopping position for stopping the motor  200 . The second pressing member  223  is movably connected to the handle  120 . The second pressing member  223  during the movement has at least a second actuating position for actuating the motor  200  and a second stopping position for stopping the motor  200 . That is, the motor  200  may be actuated by any one of the first pressing member  222  or the second pressing member  223 , and of course, the motor  200  may be actuated by simultaneously operating the first pressing member  222  and the second pressing member  223 . To explain here, the first actuating position and the first stopping position are positions where the first pressing member  222  drives the switch assembly  221  to start and stop the motor  200  respectively. Similarly, the second actuating position and the second stopping position are positions where the second pressing member  223  drives the switch assembly  221  to start and stop the motor  200  respectively. The positions where the motor  200  is started or stopped each time may not be fixed as long as the function of actuating or stopping the motor  200  can be achieved. The first pressing member  222  and the second pressing member  223  may be driven in a contact mode or in a non-contact mode. When the hand-held band saw  100  is used by the user, the user may operate the first pressing member  222  and/or the second pressing member  223  with one hand, thereby facilitating the user&#39;s operation. 
     Referring to  FIGS. 22 to 24 , the handle  120  has an accommodation cavity  121  formed by a left half housing  122  and a right half housing  123 . The switch assembly  221  is disposed in the accommodation cavity  121 , the first pressing member  222  is at least partially disposed in the accommodation cavity  121 , the first pressing member  222  is connected to the handle  120 , the first pressing member  222  is rotated about a first axis  124  with respect to the handle  120 . Specifically, one end of the first pressing member  222  is mounted on the left half housing  122  and the other end of the first pressing member  222  is freely movable. Moreover, the second pressing member  223  is also at least partially disposed in the accommodation cavity  121 , and is connected to the handle  120 . The second pressing member  223  is rotated about a second axis  125  with respect to the handle  120 . Specifically, one end of the second pressing member  223  is mounted on the left half housing  122 , and the other end of the second pressing member  223  is freely movable. Whether the first pressing member  222  and the second pressing member  223  are specifically connected to the right half housing  123  or the left half housing  122  is not limited in the present application. It is to be noted that the position connected to one end of the first pressing member  222  is referred to as a first connection point  2221 , and the position connected to one end of the second pressing member  223  is referred to as a second connection point  2231 . 
     The first pressing member  222  rotates from the first stopping position to the first actuating position, and drives the second pressing member  223  from the second stopping position to the second actuating position. Specifically, the user drives the first pressing member  222 , so that the first pressing member  222  drives the second pressing member  223  to approach the switch assembly  221 , so that the second pressing member  223  is at the second actuating position, thereby actuating the machine. As an optional manner, when the user drives the second pressing member  223 , the second pressing member  223  approaches the switch assembly  221  so that the second pressing member  223  is at the second actuating position, in this case, the first pressing member  222  is still at the first stopping position. As other optional manners, the second pressing member  223  rotates from the second stopping position to the second actuating position, drives the first pressing member  222  to move from the first stopping position to the first actuating position. Specifically, the user operates the second pressing member  223 , so that the second pressing member  223  approaches to the switch assembly  221 , and drives the first pressing member  222  to move from the first stopping position to the first actuating position. In this way, the motor  200  can be actuated by the user regardless of operating the first pressing member  222  or the second pressing member  223 . The first pressing member  222  and the second pressing member  223  are provided, so that the user can select an appropriate operation position in real time according to the position of the workpiece to be cut, especially when the workpiece to be cut is at a relatively difficult position to operate, the two pressing members give the user more choices and greatly improve the operation hand feeling of the user. 
     Referring to  FIGS. 4 and 21 , a longest distance from the first pressing member  222  to the first axis  124  is substantially equal to a longest distance from the second pressing member  223  to the second axis  125 , and the first axis  124  is substantially parallel to the second axis  125 . Specifically, the first axis  124  and the second axis  125  are substantially perpendicular to the plane P 1 . A projection distance from the first pressing member  222  to the first connection point  2221  on the plane P 1  is substantially equal to a projection distance from the second pressing member  223  to the second connection point  2231  on the plane P 1 , and the first pressing member  222  and the second pressing member  223  when pressed have the substantially same torque. The first axis  124  and the second axis  125  are perpendicular to the handle plane P 1  separately. 
     The hand-held band saw  100  further includes a second elastic member. One end of the second elastic member is fixedly connected to the handle  120  and the other end of the second elastic member is connected to the first pressing member  222 . The second elastic member is disposed in the accommodation cavity  121 . Specifically, one end of the second elastic member is fixedly connected to the handle  120 . Whether one end of the second elastic member is arranged on the left half housing  122  or the right half housing  123  is not limited herein. In this example, one end of the second elastic member is fixedly connected to the left half housing  122 . The other end of the second elastic member is connected to the first pressing member  222 . The second elastic member may specifically be a spring. When the user presses the second pressing member  223 , the first pressing member  222  moves together with the second pressing member  223  under the action of a pre-tightening force of the spring. When the user removes the pressing force on the second pressing member  223 , the second pressing member  223  returns to the second stopping position under the action of the switch assembly  221 . In this way, the second pressing member  223  drives the first pressing member  222  to return to the first stopping position. The above design is simple in structure and easy to be achieved. 
     Referring to  FIG. 24 , the first pressing member  222  has a protrusion  2222 , and the second pressing member  223  has a groove  2232 . The protrusion  2222  cooperates with the groove  2232  so that the second pressing member  223  pushes the first pressing member  222  to rotate. Specifically, the user presses the first pressing member  222 , the protrusion  2222  approaches the groove  2232  and pushes the second pressing member  223  closer to the switch assembly  221 , thereby actuating the motor  200 . When the user removes the pressing force on the first pressing member  222 , the second pressing member  223  returns to the second stopping position under the action of the switch assembly  221 , and the groove  2232  of the second pressing member  223  pushes the protrusion  2222  so as to make the first pressing member  222  return to the first stopping position. 
     A distance between the protrusion  2222  of the first pressing member  222  and the first axis  124  in a direction perpendicular to the first axis  124  is substantially equal to a distance between the groove  2232  of the second pressing member  223  and the second axis  125  in a direction perpendicular to the second axis  125 . That is, a projection distance from the protrusion  2222  to the first axis  124  on the plane P 1  is substantially equal to a projection distance from the groove  2232  to the second axis  125  on the plane P 1 . The above design has an advantage that a counterforce of the switch assembly  221  to the first pressing member  222  or the second pressing member  223  is substantially the same. 
     The first pressing member  222  has a first pressing surface  2223 , and the second pressing member  223  has a second pressing surface  2233 . The first pressing surface  2223  is substantially arc-shaped, the second pressing surface  2233  is substantially arc-shaped, and the first pressing surface  2223  is adjacent to the second pressing surface  2233 . Specifically, the user presses the first pressing surface  2223  or the second pressing surface  2233  to drive the first pressing member  222  or the second pressing member  223 . That is, the first pressing member  222  is overlapped with the second pressing member  223 , the protrusion  2222  of the first pressing member  222  and the groove  2232  of the second pressing member  223  are an overlap of the first pressing member  222  and the second pressing member  223 . A projection distance from the protrusion  2222  to the first connection point  2221  on the plane P 1  is less than a projection distance from the first pressing member  222  to the first connection point  2221  on the plane P 1 . Similarly, a projection distance from the groove  2232  to the second connection point  2231  on the plane P 1  is less than a projection distance from the second pressing member  223  to the second connection point  2231  on the plane P 1 . It can be understood that when the force is applied to the second pressing surface  2233 , the force is extended and applied to the second pressing member  223 , so that the second pressing member  223  rotates about the second axis  125 . When the counterforce of the switch assembly  221  to the second pressing member  223  is applied to the second pressing surface  2233 , a distance between the second axis  125  and the second pressing surface  2233  is greater than a distance between the groove  2232  and the second axis  125 , that is, a force arm of the second pressing member  223  is greater than a force arm of the counterforce force, so that the force arm of the user acting on the second pressing member  223  is prolonged and the pressing is more labor-saving. Similarly, the first pressing member  222  also has the same principle, which is not repeated herein. 
     The first pressing surface  2223  and the second pressing surface  2233  are substantially continuous. That is, the first pressing surface  2223  and the second pressing surface  2233  are basically arc-shaped. The user can not only activate the motor  200  by pressing either the first pressing surface  2223  or the second pressing surface  2233 , but also press the overlap of the first pressing surface  2223  and the second pressing surface  2233  to actuate the motor  200 . With the above arrangement, the pressing area of the actuating device  220  is increased, so that the user can select an appropriate gripping angle according to the user&#39;s own gripping habit, thereby improving the use safety of the hand-held band saw  100  while facilitating the user&#39;s operation. 
     The switch assembly  221  includes an actuating element  2211  for touching the motor  200 . The actuating element  2211  has a triggering portion  2212  which cooperates with the second pressing member  223 . The second pressing member  223  has triggering surface  2234 . When the second pressing member  223  moves from the second stopping position to the second actuating position, the triggering surface  2234  cooperates with the triggering portion  2212  so that the actuating element  2211  triggers the motor  200  to actuate, and the triggering portion  2212  is disposed adjacent to the triggering surface  2234 . Specifically, the user presses any one of the first pressing member  222  and the second pressing member  223 , so that the triggering surface  2234  pushes the triggering portion  2212  to actuate the motor  200 . When the user withdraws the external force, the actuating element  2211  is restored, that is, the triggering portion  2212  pushes the triggering surface  2234  to make the second pressing member  223  return to the second stopping position. 
     As other optional examples, the actuating device  220  may also be arranged on power tool products such as an electric circular saw, a reciprocating saw, a multi-functional tool, an electric drill, an electric router and the like. The specific structure is not described here in detail. 
     The above are just preferred examples of the present application and the scope of the present application is not limited by the above examples. However, any equivalent modifications or changes made by those skilled in the art according to the contents disclosed in the present application should be within the scope described by the claims.