Patent Application
20110289745
1. Field of the Invention The present invention relates to a rivet gun and more particularly, to a rivet gun with an improved actuation structure.
2. Description of the Related Art
A conventional rivet gun has a driving mechanism set in the rear side of the gun body, keeping its driving, for example, the rotating member in axial alignment with the rivet and the beam barrel for direct driving without any complicated linking mechanism.
However, the aforesaid rivet gun has the drawback of long axial length, not suitable for use in a narrow place. Further, if the aforesaid prior art design requires a broken shaft recycling structure to recycle broken rivet shaft, the installation of the broken shaft recycling structure may be overlapped or interfering with the driving mechanism, complicating the structural design.
Therefore, it is desirable to provide a rivet gun that eliminates the aforesaid problem.
The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a rivet gun, which has the driving mechanism mounted in, for example, the grip of the gun body at a predetermined angle relative to the beam barrel of the riveting mechanism to achieve a better utilization of space and, and the coupling portion of the linking device be matched with a linking device limiter of the gun body to enhance the applied force and to achieve a better linking effect.
To achieve this and other objects of the present invention, a rivet gun for driving a rivet consisting of a smooth cylindrical shaft with a head on one end, comprising a gun body, a riveting mechanism, a driving mechanism and a linking device. The gun body comprises a beam barrel matching portion, a displacement control device matching portion, a linking device limiter and a rivet holder for holding the rivet for setting. The riveting mechanism comprises a beam barrel mounted in and axially movable along the beam barrel matching portion of the gun body, having a driven portion and a rivet seizing unit adapted for catching the cylindrical shaft of the rivet. The driving mechanism comprises a displacement control device mounted in and axially movable along the displacement control device matching portion of the gun body. The linking device comprises a coupling portion located on the middle part thereof and coupled to the linking device limiter of the gun body, a driving portion located on one end thereof and mounted to the driven portion of the beam barrel and a pivot located on an opposite end thereof and coupled to and movable by the displacement control device of the driving mechanism.
Further, the linking device limiter of the gun body is a pivot rod; the coupling portion of the linking device is a sliding slot coupled to the linking device limiter for allowing movement of the inking device relative to the gun body within a limited range.
Further, the sliding slot of the coupling portion of the linking device can be smoothly arched.
The riveting mechanism further comprises an end block member connected to a rear side of the beam barrel for delivering the broken part of the cylindrical shaft of the rivet when the rivet is set in an object.
Further, the center of the linking device limiter of the gun body and the center of the pivot of the linking device define a first arm of force; the center of the linking device limiter of the gun body and the center of the driving portion of the linking device define a second arm of force; the first arm of force increases gradually and the second arm of force decreases gradually during a riveting operation of the rivet gun.
The driving mechanism further comprises a screw member threaded into the displacement control device and rotatable to move the displacement control device.
Further, the moving path of the displacement control device of the driving mechanism can be a linear path or arc path.
Further, the linking device is moved relative to the gun body when biased. The rivet gun further comprises rivet shank collector arranged at the rear side of the riveting mechanism for collecting the broken part of the cylindrical shaft of the rivet when the rivet is set in an object.
Referring to
a gun body 10, which a beam barrel matching portion 13, a displacement control device matching portion 15, a linking device limiter 17, and a rivet holder 19 for holding the loaded rivet R for setting, wherein the gun body 10 consists of a gun barrel 11 and a grip 12 connected to the gun barrel 11 at a predetermined angle; the beam barrel matching portion 13 is located on the gun barrel 11; the displacement control device matching portion 15 is located on the grip 12;
a riveting mechanism 30, which comprises a beam barrel 31 mounted in and axially movable along the beam barrel matching portion 13 of the gun body 10 and having at least one, for example, two driven portions 313 symmetrically located on two opposite lateral sides thereof, and a rivet seizing unit 32 adapted for catching the cylindrical shaft R3 of the loaded rivet R, wherein the rivet seizing unit 32 can be prepared subject to known techniques, for example, the rivet seizing unit 32 according to the present preferred embodiment comprises a cone member 33, two jaws 34, a jaw pusher 35 and a spring member 36;
a driving mechanism 50, which comprises a displacement control device 51 mounted in and axially movable along the displacement control device matching portion 15 of the gun body 10, and a compression spring 53 adapted to impart an upward pressure to the displacement control device 51; and
a linking device 70, which comprises a coupling portion 71 located on the middle and coupled to the linking device limiter 17 of the gun body 10, at least one, for example, two driving portions 73 bilaterally located on one end thereof and respectively mounted to the driven portions 313 of the beam barrel 31 of the riveting mechanism 30 and a pivot 75 located on the other end thereof and coupled to and movable by the displacement control device 51 of the driving mechanism 50, whereby the riveting mechanism 30 is driven to move by the linking device 70.
Further, the linking device limiter 17 of the gun body 10 according to the present preferred embodiment is a pivot rod; the coupling portion 71 of the linking device 70 is a sliding slot coupled to the linking device limiter 17 for allowing movement of the linking device 70 relative to the gun body 10 within a limited range.
Further, the sliding slot of the coupling portion 71 of the linking device 70 is an arched sliding slot.
The riveting mechanism 30 further comprises an end block member 39 connected to the rear side of the beam barrel 31 for delivering the broken part of the cylindrical shaft R3 of each rivet R been set.
Further, the center of the linking device limiter 17 of the gun body 10 and the center of the pivot 75 of the linking device 70 define a first arm of force L1; the center of the linking device limiter 17 of the gun body 10 and the center between the two driving portions 73 of the linking device 70 define a second arm of force L2. During riveting, the first arm of force L1 increases gradually, and the second arm of force L2 decreases gradually.
The driving mechanism 50 further comprises a screw member 55 threaded into the displacement control device 51 and rotatable to move the displacement control device 51. The screw member 55 has a threaded shank 57 threaded into an inner thread (not shown) in the displacement control device 51.
Further, when the linking device 70 is biased relative to the gun body 10, it is moved relative to the gun body 10 simultaneously.
The rivet gun further comprises a rivet shank collector 90 arranged at the rear side of the riveting mechanism 30 for collecting the broken part of the cylindrical shaft R3 of each rivet R been set. Further, the beam barrel 31, jaw pusher 35 and end block member 39 of the riveting mechanism 30 each have an axially extending through hole for the passing of the broken part of the cylindrical shaft R3 of each rivet R been set.
Further, the beam barrel matching portion 13 of the gun body 10 is an axle hole.
Further, the displacement control device matching portion 15 of the gun body 10 is a hexagonal inner hole, and the displacement control device 51 is a hexagonal shaft member fitting the hexagonal inner hole of the displacement control device matching portion 15 of the gun body 10.
The operation of the rivet gun is outlined hereinafter:
At first, insert the rivet R in the rivet holder 19 of the gun body 10, as shown in
When the user operates a rotating device (not shown) to rotate the screw member 55 of the driving mechanism 50, the displacement control device 51 of the driving mechanism 50 is moved linearly along the displacement control device matching portion 15 of the gun body 10 by the screw member 51, causing the linking device 70 to be biased and moved subject to the constraint of the pivot 75 and the coupling portion 71. At this time, the first arm of force L1 increases gradually and the second arm of force L2 decreases gradually to overcome the stress gradually and to let the driving portions 73 move the riveting mechanism 30 in breaking the cylindrical shaft R3 of the rivet R, as shown in
Further, it is to be understood that the moving path of the displacement control device 51 of the driving mechanism 50 can be a linear path or arc path. Both the linear path and the arc path can achieve the same displacement control.
Still further, the driving portions of the linking device mounted to the driven portions of the riveting mechanism can be the way of pivot, fit or couple.
In conclusion, the improvement of the present invention is to have the driving mechanism of the rivet gun be set in, for example, the grip, at a predetermined angle relative to the axis of the beam barrel, achieving a better utilization of space. Further, the matching arrangement between the coupling portion 71 of the linking device 70 and the linking device limiter 17 of the gun body 10 enhances the applied force and achieves a better linking effect.
Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
