CN101428405A

CN101428405A - Clamp

Info

Publication number: CN101428405A
Application number: CNA2007101353284A
Authority: CN
Inventors: 王家达
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2007-11-05
Filing date: 2007-11-05
Publication date: 2009-05-13
Anticipated expiration: 2027-11-05
Also published as: CN101428405B

Abstract

The invention relates to a clamping device, comprising a casing, a fixed forceps holder which is fixedly connected with the casing, a moveable forceps holder which can move relative to the casing, a driving component which is arranged in the casing, a motor which is arranged in the casing, and a control element, wherein, the driving component can be connected to the moveable forceps holder; the motor can be connected to the driving component; and the control element which can be connected to the driving component can drive the driving component to enable the moveable forceps holder to move in an axial direction when the motor does not work. The clamping device has the beneficial effects of simple structure and easy manufacture. Moreover, the clamping device further comprises a manual control element which enables the clamping device to work under the conditions that the power supply is not available or enough. Therefore, the clamping device has two modes, that is, a manual mode and an electric mode, thereby providing great convenience for the operators.

Description

Clamping device

Technical Field

The invention relates to a device which can apply pressure to a workpiece so as to clamp the workpiece.

Background

Clamping devices are currently used in a number of fields, including machinery, woodworking, etc., where different shapes of clamping devices can be adapted for different purposes. Likewise, conventional clamping devices require manual adjustment of the distance between the jaws, as described in US 6367787. However, such manual adjustment is time consuming and tedious, and can cause fatigue to the worker when multiple releases or clamps of the workpiece are required. Another disadvantage of manually adjustable clamping devices is that the speed of release or clamping of the jaws is relatively slow.

In order to solve the above-mentioned problems of manual adjustment of the distance between the jaws, US2007138724 discloses a device for adjusting the distance between the jaws in an electric manner, the transmission mechanism of which is similar to the drive mechanism of a conventional electric drill. Because the driving mechanism of the device drives the jaws to close or separate by electric power, the device is more labor-saving and quicker than a manual adjusting mechanism. However, this device suffers from a problem, but when the power supply is exhausted and no new power supply can be found, the device cannot operate. When a certain process is halved, the problem becomes more serious when the whole workpiece is scrapped because the clamping device cannot work.

Disclosure of Invention

The invention aims to provide a clamping device which can adjust the clamping distance in a manual mode and an electric mode.

Another object of the invention is to provide a clamping device which is simple in construction and easy to produce.

The technical scheme adopted by the invention for solving the problems in the prior art is as follows:

a clamping device, comprising: a housing; a fixed jaw fixedly connected with the housing; a moving jaw movable relative to the housing; a transmission assembly disposed within the housing, operatively connected to the moving jaw; a motor disposed within the housing, operably connected to the transmission assembly, and providing a driving force for moving the jaws axially; it also includes a control member operatively connected to the drive assembly, the control member being operable to drive the drive assembly to cause axial movement of the movable jaw when the motor is not operating.

The clamping device has two working modes of manual operation and electric operation, wherein the electric mode drives the moving jaw to continuously axially move by the motor, and the manual mode enables the moving jaw to intermittently axially move by the control element.

The control element is a pivotable trigger disposed on the housing.

The transmission assembly comprises a piston rod fixedly connected with the movable jaw and capable of moving relative to the shell; at least one drive rod slidably coupled to the piston rod; and a cam driven to rotate by the motor; the cam can drive the drive rod, and energy is continuously transferred from the motor to the piston rod and to move the jaws during rotation of the cam.

The transmission assembly further comprises a movable shaft fixedly connected with the cam, and the movable shaft is connected to the motor in a matching mode, can be driven by the motor to rotate and can move axially relative to the motor.

The cylindrical surface of the cam is a cam surface which consists of an ascending surface and a descending surface and can drive the driving rod. The falling surface is substantially parallel with respect to the motor axis.

And a first driving rod and a second driving rod are matched with the piston rod in a sliding way, and the cam surface of the cam can drive the first driving rod and the second driving rod simultaneously.

The cam is mutually abutted with the first driving rod and the second driving rod at a first contact point and a second contact point respectively, and the included angle of the first contact point and the second contact point with the axis of the cam is 210 degrees.

The first and second drive levers each have a wheel that is in rolling engagement with the cam surface of the cam.

The shell comprises three side walls for slidably supporting the piston rod, the first driving rod and the spring abutted against the first driving rod are arranged between the first side wall and the second side wall, and the second driving rod and the spring abutted against the second driving rod are arranged between the second side wall and the third side wall.

The front end of the shell is a C-shaped frame, and the movable clamp can move towards the fixed clamp at the opening of the frame.

The clamping device also comprises a locking rod with a through hole, the piston rod penetrates through the through hole, and the locking rod can be pressed to extrude the piston rod; and a switch for switching between a first position in which the locking lever is allowed to be pressed to press the piston rod and a second position in which the locking lever is held against the pressing force in a position in which the piston rod can move freely in the through hole.

A spring is arranged between the locking rod and the shell.

The switch includes a semi-circular end in contact with the lock lever that switches from compressing the piston rod to releasing the piston rod when the switch is rotated from the first position to the second position.

The shell is internally provided with a switch which can switch on or off the power supply of the motor.

The control element is also provided with a convex part which can control the switch.

Compared with the prior art, the invention has the beneficial effects that: the clamping device has a simple structure and is easy to produce, and the clamping device comprises a manual control element, so that the clamping device can work under the condition of no power supply or insufficient power supply, and has two modes of manual operation and electric operation, so that an operator can conveniently operate the clamping device.

Drawings

Fig. 1 is a schematic view of the present invention in an initial state.

Fig. 2 is an enlarged view of a portion a in fig. 1.

Fig. 3 is a schematic view of the cam of the present invention.

Fig. 4 is a cross-sectional view of C-C in fig. 2.

Fig. 5 is a schematic diagram of the present invention in a driving state.

Fig. 6 is an enlarged view of a portion B in fig. 5.

Wherein,

1 housing 11 first side wall 12 second side wall

13 third side wall 14 frame 15 fixed jaw

16 moving jaw 17 hole 2 piston rod

3a,

3b drive rod

31a, 31b through

hole

32a, 32b contact point

33a,

33b wheels

34a, 34b spring 35a, 35b contact point

4 cam 40 cam surface 41 rising surface

42 falling surface 5 first end of movable shaft 51

52 second end 53 ball 54 spring

6 Motor 60 Motor axis 61 Battery

62 wire 63 switch 64 torsion spring

7 trigger 71 pivot point 72 boss

73 first end 74 second end 8 transducer

81 semicircular end 82 locking lever 83 spring

Angle between P and Q of 84 through holes

Detailed Description

As shown in fig. 1, the present invention discloses a clamping device, which comprises a housing 1, wherein the interior of the housing is provided with the working components of the clamping device, and the front end of the housing 1 is a C-shaped frame 14, and a workpiece to be clamped can be put in from the opening of the C-shaped frame 14. Fixed at the opening of the C-shaped frame 14 is a fixed jaw 15, facing which is a moving jaw 16, which moving jaw 16 is movable relative to the housing 1 at the frame opening. When the workpiece is placed in the opening of the C-shaped frame 14, the moving jaw 16 moves toward the fixed jaw 15 to reduce the distance therebetween, and eventually, the workpiece can be clamped.

The housing 1 is provided with a first, a second and a

third side wall

11, 12, 13, and a piston rod 2 is movably disposed on the clamping device housing 1 through all the side walls and is capable of moving axially relative to the housing 1. The piston rod 2 is fixedly connected to the moving jaw 16, i.e. the axial movement of the piston rod 2 can drive the moving jaw 16 to move axially.

The battery 61 is disposed at the handle of the housing 1, but may be disposed at other suitable positions of the clamping device, and of course, an external ac power source may be used. The motor 6 is located within the housing 1 and is connected to a battery 61 by wires 62. A switch 63 is provided in the housing 1 for switching on and off the connection between the motor 6 and the battery 61.

With reference to fig. 2, the motor 6 has a motor axis 60, and the movable shaft 5 is connected to the motor 6 and is axially movable relative to the motor 6, and the first end 51 of the movable shaft 5 is inserted into the motor 6 and is driven by the motor 6 to rotate around the motor axis 60. The motor 6 and the movable shaft 5 are connected in a flat square or spline manner. The second end 52 of the movable shaft 5 projects into the bore 17 of the housing 1. A spring 54 is also arranged in the bore 17, one end of the spring 54 abutting against one of the balls 53, which ball 53 in turn abuts against the second end 52 of the loose axle 5. Thus, when the movable shaft 5 moves axially, the spring 54 is pressed, and when the external driving force applied to the movable shaft 5 disappears, the spring 54 drives the movable shaft 5 to return to the initial position.

Meanwhile, the movable shaft 5 is fixedly matched with a cam 4, and when the movable shaft 5 moves axially, the cam 4 can be driven to move axially together. Referring to fig. 3, the cylindrical surface of the cam 4 in this embodiment is a cam surface 40, and the cam surface 40 is composed of a rising surface 41 and a falling surface 42. The descending surface 42 of the cam 4 is in the form of a gradually decreasing ramp, disposed at an angle P to the movable shaft 5, substantially parallel to the motor axis.

In the preferred embodiment, two

drive rods

3a, 3b are slidably coupled to the piston rod 2. The first drive lever 3a and the spring 34a are disposed between the first and

second side walls

11, 12; the second drive lever 3b and the spring 34b are disposed between the second and

third side walls

12, 13. The first drive lever 3a is longer than the second drive lever 3 b. The drive levers 3a, 3b are provided with through

holes

31a, 31b for receiving the piston rod 2. In this embodiment the piston rod 2 is cylindrical and the through

holes

31a, 31b are also circular, and the diameter of the piston rod 2 is slightly smaller than the diameter of the through

holes

31a, 31 b. The shape of the piston rod 2 and the through

holes

31a, 31b is of course also other shapes, such as hexagonal, square, etc.

As shown in fig. 4, one end of each of the first and

second driving levers

3a, 3b is pivotally provided with a

wheel

33a, 33b, and the

wheel

33a, 33b is in rolling engagement with the cam surface 40 of the cam 4. The cam surface 40 and the

wheels

33a and 33b of the first and second drive levers 3a and 3b abut against each other at the first contact point 35a and the second contact point 35b, respectively. The angle Q between the connecting line of the first contact point 35a and the second contact point 35b and the cam axis is 210 degrees. Of course, the angle between them may be between 120 and 240 degrees, and 180 degrees is the best effect theoretically, but considering other reasons such as error, the two are set to be approximately 210 degrees at present, and can be adjusted according to the needs. The first and

second drive levers

3a, 3b may be disposed up and down or left and right with respect to the movable shaft 5, and the first and

second drive levers

3a, 3b are disposed left and right with respect to the movable shaft 5 in this embodiment.

The piston rod 2, the driving

rods

3a and 3b, the cam 4 and the movable shaft 5 form a transmission assembly. The moving jaw 16 may be driven to move towards the fixed jaw 15 by the transmission assembly.

As shown in fig. 1, a control element 7 capable of driving the cam 4 to move is further provided on the housing 1. In this embodiment a trigger 7 which is rotatable about a pivot point 71 provided on the housing 1. The first end 73 of the trigger 7 abuts the cam 4 and the second end 74 is the operator's grip. A boss 72 that controls the switch 63 is also provided in the middle of the trigger 7. In fig. 1, the switch 63 is pressed by the bulge 72, so that the contact of the switch 63 is not closed, and the power supply of the motor 6 is cut off; when the trigger 7 is depressed, as shown in figure 5, the boss 72 releases the switch 63, allowing the switch 63 to close the contact under the action of the torsion spring 64, thus turning on the power to the motor 6.

As shown in fig. 1 and 2, a switch 8 is further provided on the housing 1, a locking rod 82 having a through hole 84 is coupled to the switch 8, and the piston rod 2 is disposed through the through hole 84. A spring 83 is disposed between the lock lever 82 and the housing 1, and the spring 83 is compressed in an initial state, so that the lock lever 82 can be pressed to press the piston rod 2. The switch 8 has a semicircular end 81 in contact with a locking lever 82 and the switch 8 can be switched between the first and second positions by rotating about its axis. As shown in fig. 1, in the first position, the lock lever 82 obliquely presses the piston rod 2 under the pressure of the spring 83; in the second position, as shown in fig. 5, the semicircular end 81 presses the lock lever 82, so that the lock lever 82 is held in a position where the piston rod 2 can move freely in the through hole 84 against the pressing force of the spring 83.

The following description will implement the manual operation procedure as follows: when the clamping device is not provided with a battery and needs to clamp a workpiece, the converter 8 must be firstly switched to the first position, as shown in fig. 1, and the locking rod 82 is pressed to press the piston rod 2, so that the two are self-locked. The trigger 7 is actuated, and the first end 73 of the trigger 7 pushes the cam 4 and the movable shaft 5 to move forward, so that the cam 4 pushes the first and second driving levers 3a and 3b to rotate around the

contact points

32a and 32b (shown in fig. 6) to engage with the piston rod 2. As shown in fig. 5, the trigger 7 is pulled further, and the first and

second driving rods

3a and 3b and the piston rod 2 are self-locked, so that the piston rod 2 is pushed to move forward, thereby controlling the moving jaw 16 to move forward to clamp the workpiece. When the trigger 7 is released, the first and

second driving levers

3a, 3b are rapidly returned to the initial position shown in fig. 1 by the spring force due to the absence of the pushing force, and at this time, the piston rod 2 is not moved backward because the locking lever 82 and the piston rod 2 are in the self-locking state, so that the clamping device can be manually operated by continuously pulling the trigger 7, and the movable jaw 16 is intermittently axially moved.

The following describes the operation process for realizing electric operation: when it is desired to electrically clamp the workpiece, the switch 8 is first switched to the second position, as shown in fig. 5, the locking lever 82 is held in a position in which the piston rod 2 is free to move within the through bore 84. When the trigger 7 is pulled, the bulge 72 releases the switch 63, so that the switch 63 closes the contact under the action of the torsion spring 64, the connection between the motor 6 and the battery 61 is connected, and the motor 6 can work to drive the movable shaft 5 to drive the cam 4 to rotate together. In addition, the first end 73 of the trigger 7 pushes the cam 4 and the movable shaft 5 to move forward together, so that the cam 4 is engaged with the

wheels

33a and 33b of the first and second driving levers 3a and 3b, and further pushes the first and second driving levers 3a and 3b to rotate around the

contact points

32a and 32b to engage with the piston rod 2, and the state shown in fig. 5 is achieved. As shown in fig. 4, the cam 4 rotates to make the ascending surface 41 drive the first driving rod 3a and the piston rod 2 to move forward, and the second driving rod 3b is still at the position of matching with the descending surface 42. As the cam 4 continues to rotate, the second driving lever 3b will slowly contact the rising surface 41, and similarly, the rotation of the cam 4 will cause the rising surface 41 to drive the second driving lever 3b and the piston rod 2 to move forward while the first driving lever 3a is in engagement with the falling surface 42. Due to some friction and error in practice, in this embodiment, the area of the ascending surface 41 is larger than that of the descending surface 42, and the positions of the first and

second driving rods

3a and 3b on the cam surface 40 are set at 210 degrees, so that the time for the first and

second driving rods

3a and 3b to drive the piston rod 2 to move forward partially overlaps, thereby ensuring better stability of the piston rod 2 driving the moving jaw 16 to move forward. The motor 6 drives the set of transmission assemblies to continuously drive the movable jaw 16 without loosing the hand by pressing the trigger 7, so that the clamping device is electrically operated, and the movable jaw 16 continuously moves axially.

When the switch 8 is in the first position in fig. 1, the locking lever 82 is in a self-locking state with the piston rod 2, in which case the piston rod 2 is not movable backwards with respect to the housing 1. When the switch 8 is in the second position, the locking lever 82 is unlocked from the piston rod 2, and the piston rod 2 is movable backwards relative to the housing 1. It follows that when it is desired to pull the piston rod 2 in a direction to release the jaws from the workpiece, the translator 8 must be brought to the second position.

There are various specific embodiments of the present invention, such as: the control element may be a push button or other movable element; or the shell is internally provided with only one driving rod, so that the structure of the clamping device is simpler; or the cam surface may be arranged to comprise a relatively steeper descent surface for better stability of the piston rod movement. In addition, the driving assembly of the clamping device is not limited to only using the cam, but also other driving mechanisms known to those skilled in the art, such as a rack and pinion, etc., and it is within the scope of the present invention to only replace the driving manner to realize both manual and electric modes.

Claims

1. A clamping device, comprising:

a housing (1);

a fixed jaw (15) fixedly connected with the shell (1);

a moving jaw (16) movable relative to the housing (1);

a transmission assembly disposed within the housing (1) operatively connected to the moving jaw (16);

a motor (6) disposed within the housing (1), operatively connected to the transmission assembly and providing a driving force for moving the movable jaw (16) to provide the clamping device with an electric operating mode;

the method is characterized in that: it also comprises a control element (7), the control element (7) being operatively connected to the transmission assembly, the control element (7) being capable of driving the transmission assembly to produce an axial movement of the moving jaw (16) when the motor (6) is not operating, in order to provide the gripping device again with a manual operating mode.

2. The clamping device of claim 1, wherein: in which the moving jaw (16) is driven by the motor (6) with continuous axial movement, and in which the moving jaw (16) is intermittently axially moved by the control element (7).

3. The clamping device of claim 2, wherein: the control element is a pivotable trigger (7) arranged on the housing (1).

4. The clamping device of claim 3, wherein: the transmission assembly comprises

A piston rod (2) fixedly connected with the movable jaw (16) and capable of moving relative to the shell (1);

at least one driving rod (3a, 3b) in sliding fit with the piston rod (2);

and a cam (4) driven to rotate by a motor (6);

the cam (4) can drive the drive rods (3a, 3b), and during the rotation of the cam (4) energy is continuously transferred from the motor (6) to the piston rod (2) and to the moving jaw (16).

5. The clamping device of claim 4, wherein: the transmission assembly further comprises a movable shaft (5) fixedly connected with the cam (4), and the movable shaft (5) is connected to the motor (6) in a matching mode, can be driven by the motor (6) to rotate, and can move axially relative to the motor (6).

6. The clamping device of claim 4, wherein: the cylindrical surface of the cam (4) is a cam surface (40), the cam surface (40) is composed of an ascending surface (41) and a descending surface (42), and the cam surface (40) can drive the driving rods (3a and 3 b).

7. The clamping device of claim 6, wherein: the descending surface (42) is substantially parallel with respect to the motor axis (60).

8. The clamping device of claim 6, wherein: and a first driving rod (3a) and a second driving rod (3b) are matched with the piston rod (2) in a sliding way, and the cam surface (40) of the cam can drive the first driving rod (3a) and the second driving rod (3b) simultaneously.

9. The clamping device of claim 8, wherein: the cam (4) is mutually abutted with the first driving rod (3a) and the second driving rod (3b) at a first contact point (35a) and a second contact point (35b), and the included angle of the connecting lines of the first contact point (35a) and the second contact point (35b) and the axis of the cam is 210 degrees.

10. The clamping device of claim 9, wherein: the first and second drive levers (3a, 3b) have wheels (33a, 33b) that are in rolling engagement with the cam surface (40) of the cam (4), respectively.

11. The clamping device of claim 10, wherein: the housing (1) comprises three side walls (11, 12, 13) which slidably support the piston rod (2), the first drive rod (3a) and the spring (34a) abutting against it are arranged between the first side wall (11) and the second side wall (12), and the second drive rod (3b) and the spring (34b) abutting against it are arranged between the second side wall (12) and the third side wall (13).

12. The clamping device of claim 1, wherein: the front end of the shell (1) is a C-shaped frame (14), and the movable clamp (16) can move towards the fixed clamp (15) at the opening of the frame.

13. The clamping device as claimed in any one of claims 1-12, wherein: the clamping device further comprises a locking rod (82) with a through hole (84), the piston rod (2) is arranged through the through hole (84), and the locking rod (82) can be pressed to extrude the piston rod (2); and a switch (8) that switches between a first position, in which the locking lever (82) is allowed to be pressed against the piston rod (2), and a second position, in which the locking lever (82) is held against the pressing force in a position in which the piston rod (2) can move freely in the through hole (84).

14. The clamping device of claim 13, wherein: a spring (83) is arranged between the locking rod (82) and the shell (1).

15. The clamping device of claim 14, wherein: the switch (8) comprises a semi-circular end (81) in contact with a locking lever (82), the locking lever (82) switching from pressing the piston rod (2) to releasing the piston rod (2) when the switch (8) is rotated from the first position to the second position.

16. The clamping device as claimed in any one of claims 1-12, wherein: a switch (63) capable of switching on or off the power supply of the motor (6) is arranged in the shell (1).

17. The clamping device as set forth in claim 16, wherein: the control element (7) is also provided with a convex part (72) which can control the switch (63).