The present invention provides a small electric blind rivet setting device that is capable of being driven by a battery and that does not require a pathway for recovering the broken mandrels to be provided in the motor shaft. A recovery container 10 is provided in a tool housing 27 forward of an electric motor 13 in the axial direction, and a spindle 14, which rotates because of the rotation of a drive shaft 18 connected to the electric motor circumventing the recovery container, is connected so as to move a pulling head (30) in the axial direction. The positive rotation, stopping of rotation and reverse rotation of the electric motor are controlled by a pulling operation on a trigger and detecting the position of the pulling head in the axial direction.
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0. 10. An electric blind rivet setting device comprising a hollow nose that accepts a mandrel of a blind rivet comprising a mandrel and rivet body, a tool housing disposed in an axial direction behind said nose, jaws disposed inside said nose for gripping the mandrel, a pulling head inside said nose for pulling said jaws backward in the axial direction from a home position and returns said jaws to said home position, an electric motor disposed in the housing for moving said pulling head in the axial direction and a drive force transfer gear train to pull said pulling head from said home position backward in the axial direction and return it forward in the axial direction to said home position by the rotation of said electric motor; said housing including a handle and a trigger switch for operating said electric motor to set the rivet when the rivet body is expanded by the mandrel of a blind rivet gripped in said jaws being pulled backward in the axial direction from said home position by said pulling head, said housing including a recovery container for receiving a part of the broken mandrel shaft from said pulling head, said container being located in said housing between said motor and said pulling head.
0. 6. An electric blind rivet setting device comprising a hollow nose that accepts a mandrel of a blind rivet comprising a mandrel and rivet body, a tool housing disposed in an axial direction behind said nose, jaws disposed inside said nose for gripping the mandrel, a pulling head inside said nose for pulling said jaws backward in the axial direction from a home position and returns said jaws to said home position, an electric motor disposed in the housing for moving said pulling head in the axial direction and a drive force transfer gear train to pull said pulling head from said home position backward in the axial direction and return it forward in the axial direction to said home position by the rotation of said electric motor; said housing including a handle and a trigger switch for operating said electric motor to set the rivet when the rivet body is expanded by the mandrel of a blind rivet gripped in said jaws being pulled backward in the axial direction from said home position by said pulling head, said housing including a recovery container for receiving a part of the broken mandrel shaft from said pulling head, said container being located in said housing between said motor and said pulling head, said drive force transfer gear train being provided in said tool housing, circumventing said recovery container.
0. 1. An electric blind rivet setting device comprising
a hollow nose that accepts a mandrel of a blind rivet comprising a mandrel and rivet body, a tool housing disposed in the axial direction behind said nose, jaws that are disposed inside said nose for gripping the mandrel, a pulling head that is inside said nose for pulling said jaws backward in the axial direction from a home position and returns said jaws to said home position, an electric motor that forms a drive power source for moving said pulling head in the axial direction and a drive force transfer gear train to pull said pulling head from said home position backward in the axial direction and return said pulling head forward in the axial direction to said home position from a back position by the rotation of said electric motor;
said housing including a handle and a trigger switch for operating said electric motor to set the rivet when the rivet body is expanded by the mandrel of a blind rivet gripped in said jaws being pulled backward in the axial direction from said home position by said pulling head,
said housing including a recovery container for receiving a part of the broken mandrel shaft from said pulling head when said rivet body is set in members being riveted, said container being located in said housing between said motor and said pulling head on a front side of said electric motor in the axial direction,
said electric motor being at the back end of said tool housing and disposed on a rear side in the axial direction of said recovery container, said drive force transfer gear train being provided in a part of said tool housing below said recovery container, circumventing said recovery container, said drive force transfer gear train being connected to said electric motor on the rear side of said recovery container so that said drive force transfer gear train rotates with said electric motor, said gear train including a drive shaft that extends forward in the axial direction from a back end and is mounted for rotation about its own axis, and a spindle that is connected to an end part of said drive shaft at the front side of said recovery container so that said spindle is rotated by the rotation of said drive shaft, said spindle being connected to said pulling head so that said pulling head is moved backward in the axial direction or forward in the axial direction by the rotation of said spindle and
a control circuit including said trigger switch and two position sensors for controlling said electric motor forward rotation, stopping of rotation and reverse rotation by detecting pulling operations of said trigger and the position of said pulling head in the axial direction due to the rotation of said drive shaft.
0. 2. The setting device according to
said drive shaft is disposed so as to be able to rotate around its own axis in the space below said recovery container by a rear gear coupled to a motor gear connected to said electric motor, said drive shaft also being coupled to a front gear that is mated to a spindle gear connected to said spindle, said drive shaft having external threads formed in the outer circumferential surface of said drive shaft between said rear gear and said front gear,
said drive shaft having a first collar and a second collar, said collars having internal threads coupled to said drive shaft threads to move the collars in the axial direction upon rotation of said drive shaft, a first one of said sensors being positioned in said tool housing adjacent to said first collar and a second one of said sensors positioned in said tool housing adjacent to said second collar, a control circuit that receives a signal from said first sensor, a signal from said second sensor and a signal from the pulling operation of said trigger, said control circuit operating so that, when said pulling head is in the state of being in said home position, said electric motor is rotated positively to move the pulling head to the rear in the axial direction when the operation of pulling said trigger is carried out and when said pulling head has been pulled back to the back position in the axial direction, the rotation of said electric motor is stopped and with the release of said trigger pulling operation, said electric motor reverses rotation and said pulling head is returned to said home position.
0. 3. The setting device according to
0. 4. The setting device according to
in the home position, said control circuit rotates said electric motor positively when said trigger is operated by pulling and an on signal is sent to the control circuit by said trigger, said drive shaft is rotated, said spindle is rotated, said pulling head pulls a mandrel of a blind rivet gripped in said jaws a prescribed length rearward in the axial direction and breaks the mandrel shaft part gripped in said jaws along with setting the blind rivet in members being riveted, said first collar also moves a prescribed length in said first direction because of the rotation of said drive shaft and separates from the position that energizes said first microswitch, the positive rotation of said electric motor is stopped by an off signal sent by said first microswitch, and an on signal output by said second microswitch when said second collar moves a prescribed length in said first direction to a position that energizes said second microswitch and an on signal is sent from said trigger switch,
when the pulling operation of said trigger switch is released after stopping the positive rotation of said electric motor, an off signal is received from said trigger switch, an off signal is received from said first microswitch and an on signal is received from said second microswitch, and said electric motor is rotated in reverse, said drive shaft is rotated, said spindle is rotated in reverse, said pulling head is returned forward in the axial direction and returns to said home position with said jaws, said first collar also moves a prescribed length in a second direction opposite to said first direction because of the rotation of said drive shaft and returns to the position that energizes said first microswitch, an on signal is sent by said first microswitch, said second collar moves a prescribed length in said second direction and separates from the position that energizes said second microswitch, an off signal is sent by said second microswitch and said home position state is maintained by the off signal from said trigger switch, the on signal from said first microswitch and the off signal from said second microswitch.
0. 5. A blind rivet setting tool comprising
an elongated housing having an axis and a handle;
said housing having a nosepiece aligned with said axis containing a receptacle for receiving a blind rivet that is to be set;
a pulling head having pulling jaws for gripping the mandrel of a rivet and pulling the mandrel in the direction of the axis to set the rivet;
a mandrel container for receiving broken mandrels, said container being located at a discharge end of the pulling head;
an electric motor located in said housing at an opposite end of said tool from said nosepiece, said motor having a rotary output shaft, said shaft driving a power transfer mechanism comprising a rotary gear on said shaft, a drive shaft parallel to the axis of the housing, said shaft being coupled to rotate with said gear, a pair of collars coupled to said shaft by threads on the shaft and the collars so that the collars move axially of the tool as the shaft rotates, said collars being coupled to said pulling head to grip and pull the mandrel and set the rivet;
a control circuit mounted in said tool for controlling the operation of the tool, said circuit comprising a trigger switch controlled by the operator and a pair of position-sensitive switches positioned adjacent said collars to locate the position of the pulling head and continue a setting operation or return the mechanism to a home position.
0. 7. The electric blind rivet setting tool device of claim 6, wherein said drive force gear train which includes a drive shaft that extends forward in the axial direction from a back side of said recovery container and is mounted for rotation about its own axis, and a spindle that is connected to the end part of said drive shaft at a front side of said recovery container so that said spindle is rotated by the rotation of said drive shaft, said spindle being connected to said pulling head so that said pulling head is moved backward in the axial direction or forward in the axial direction by the rotation of said spindle.
0. 8. The electric blind rivet setting tool device of claim 7, wherein said drive force transfer gear train is connected to said electric motor on the rear side of said recovery container so that it rotates with said electric motor.
0. 9. The electric blind rivet setting tool device of claim 6, further including a control circuit including a position sensor and said trigger switch for controlling said electric motor forward rotation, stopping of rotation and reverse rotation by detecting pulling operations of said trigger and the position of said pulling head in the axial direction due to the rotation of said drive shaft.
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or nose piece 7 on the end of the front side (end of right side in
A drive force transfer and control section 11 is provided in a part other than the recovery container 10 between the motor section 9 and the nose 7. A drive force transfer gear train otherwise known as a mechanism for transferring the rotational force (torque) of an electric motor 13 in the motor section 9 to a spindle 14, which is a rotating shaft inside the nose 7, and a control mechanism that controls the pulling operation of the trigger and the rotation of the electric motor 13 by the release operation thereof and controls the forward movement and backward movement of the pulling head in the nose 7 through the rotation of the spindle 14 are provided. The electric blind rivet setting device 1 sets blind rivets with an electric motor that has a battery as the power source. Therefore, operation does not require a fluid supply tube for compressed air or the like and is released from the troublesome operations accompanying pulling around a fluid supply tube.
A blind rivet B to be set in members to be riveted such as automotive body panels, attached components and the like by the electric blind rivet setting device 1 is held in the nose 7 in
The drive force transfer and control section 11 also has a control mechanism that controls the positive rotation, stopping and reverse rotation of the electric motor 13 according to the pulling operation of the trigger 6 and the release operation thereof. As described above, the rotation of the electric motor 13 is transferred to the spindle 14 through the drive shaft 18. The control mechanism responds to a pulling operation of the trigger 6 and a release operation thereof, and by controlling the electric motor 13, the pulling head 30 in the nose 7 is moved backward from the home position (front end position) to a back end position that breaks the mandrel shaft part of the blind rivet. It is stopped at that back end position, and by releasing the pulling operation on the trigger 6, it moves forward from the back end position returning to the home position at the front end position. As is shown in
Before describing the drive force transfer and control section 11, the structure and operation of the blind rivet setting mechanism 2 that sets the blind rivets will be described with reference to
The nose 7 also has a tip nose piece 31 and a nose housing 33 extending in a cylindrical shape from the nose piece 31 toward the tool housing 27 and affixed to the tool housing 27. As shown in FIGS. 3 and 7, nose 7 includes a nose piece 31 that defines a receptacle extending along an axial direction of the blind rivet setting mechanism 2. The receptacle is for receiving a blind rivet that is to be set. The cylindrically shaped pulling head 30 is accommodated inside of the nose housing 33 so as to be slidable in the axial direction (forward and backward directions) with respect to the nose housing 33. The jaws 29 are disposed such that the tip thereof is in contact with the back end of the nose piece 31, are formed in a narrowing tip shape toward the nose piece 31 and are accommodated in a cavity of the pulling head 30 that narrows toward the tip. When the pulling head 30 is pulled toward the rear, force is applied to the inclined surfaces of the narrowing part concentrically toward the axial center, and the gripping force on the shaft part of the mandrel M of the blind rivet B held in the cavity at the axial center of the jaws 29 is intensified. The jaws 29 are divided into 2 to 4 pieces in the circumferential direction inside the cylindrically shaped pulling head 30 and are assembled to a cylindrical body in the hollow of the cavity at the axial center of the pulling head 30. They receive the mandrel M of the blind rivet B inserted from the nose piece 31, and hold the shaft part of the mandrel M so that it is not released.
In the embodiment shown in the drawings, as is shown in detail in
As is shown in
As described above, the recovery container 10 for recovering the broken mandrel shaft parts after blind rivet setting is formed in a position in proximity to the handle 3 between the nose 7 and the motor section 9. The handle 3 extends from the position of this recovery container 10 downward at a slant such that the blind rivet setting device 1 is easily gripped by a worker. The recovery container 10 is disposed in a middle position in the tool housing 27; therefore, there is no need to install a mandrel collector at the back end of the tool housing as in Patent Reference 2, and there is no instability when held by hand by a worker because of the weight of the electric motor and operation as in Patent Reference 1.
The drive force transfer and control section 11, which is an important part of the electric blind rivet setting device 1 according to the present invention will be described with reference to
As is shown in
The manner in which the electric motor 13 (spindle 14) and the pulling head 30 (and jaws 29) are controlled by the control means according to the operation of the trigger 6, the on/off operation of the first microswitch 25 by the first collar 22 and the on/off operation of the second microswitch 26 by the second collar 23 will be described with reference to
In the control circuit 55, which is the control means, in
Before the electric motor 13 is supplied with electric power from the battery 51, the pulling head 30 is positioned in the home position (position in
If the trigger 6 is pulled in a state where an on signal is output by the first microswitch 25 and an off signal is output by the second microswitch 26, an on signal is output by the trigger switch 49, and the signal processing section 55A of the control circuit 55 provided in the electric blind rivet setting device 1 outputs a positive rotation signal that rotates the electric motor 13 positively. The driver 55B that has received the positive rotation signal sends electric power from the battery 51 to the electric motor 13 and causes positive rotation. The positive rotation of the electric motor 13 is transferred to the spindle 14 through the motor gear 15, rear gear 19, drive shaft 18, front gear 21 and spindle gear 17, and the spindle rotates positively. The positive rotation of the spindle 14 rotates the screw member 38 (
The positive rotation of the electric motor 13 rotates the drive shaft 18 in reverse because of the motor gear 15 and the rear gear 19, and as is shown by the arrow 50 in
When the pulling operation of the trigger 6 is released in the state where the rotation of the electric motor 13 is stopped and the pulling head 30 is in the back end position (in other words, the state where an on signal is output by the trigger switch 49 of the trigger 6, an off signal output by the first microswitch 25 and an on signal output by the second microswitch 26), the on signal from the from the trigger switch 49 of the trigger 6 disappears (or an off signal is output). The signal processing section 55A of the control circuit 55 receives the off signal from the trigger switch 49, the off signal from the first microswitch 25 and the on signal from the second microswitch 26 and outputs a reverse rotation signal. The driver 55B that receives the reverse rotation signal rotates the electric motor 13 in reverse. The spindle 14 is rotated in reverse by the reverse rotation of the electric motor 13, the screw member 38 rotated in reverse and the pulling head 30 (jaws 29) is moved from the back end position toward the home position at the front end. In addition, the drive shaft 18 is rotated positively, and the first collar 22 and the second collar 23 move in the direction opposite of the arrow 50 in
Moreover, during positive rotation of the electric motor 13, the first collar 22 and the second collar 23 move forward along the drive shaft 18. An off signal is output by the first microswitch 25. However, if the pulling operation of the trigger 6 is released in the state where the second collar 23 is [in a position] before it presses the switch lever 54 of the second microswitch 26 and the off signal is being output by the second microswitch 26, the signal processing section 55A of the control circuit 55 receives the off signal from the first microswitch 25, the off signal from the second microswitch 26 and the off signal from the trigger switch 49 of the trigger 6. A reverse rotation signal is sent to the driver 55B, and the driver 55B rotates the electric motor 13 in reverse. The reverse rotation of the electric motor 13 continues until in an on signal is output by the first microswitch 25 and an off signal is output by the second microswitch 26, and the pulling head 30 (jaws 29) returns to the home position on the front end side of the blind rivet setting mechanism 2. Therefore, even if the blind rivet setting operation is terminated for some reason, it is assured that the pulling head 30 will return to the home position. Therefore, even when the blind rivet setting operation is terminated while in progress, blind rivet setting operation may be continued easily by releasing the pulling operation of the trigger 6.
It will be appreciated by persons skilled in the art that the above embodiments have been described by way of example only, and not in any limitative sense, and that various alterations and modifications are possible without departure from the scope of the invention as defined by the appended claims.
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