Nut riveter

The present invention discloses a nut riveter comprising a front riveter seat with a cavity, a rear riveter seat arranged in the cavity of the front riveter seat and located at a rear end of the front riveter seat, a nut adjusting mechanism arranged at a front end of the front riveter seat, a nut riveting rod installed in the nut adjusting mechanism, wherein two sides of the rear riveter seat are each connected to a handle through a connecting rod; a pull rod seat located in the cavity of the front riveter seat, wherein a pull rod is inserted into the pull rod seat, wherein a rear end of the pull rod is connected with a pull rod retractable mechanism.

FIELD OF INVENTION

The present invention relates to the technical field of riveting tools, in particular to a nut riveter.

BACKGROUND OF THE INVENTION

A nut riveter is a tool used for riveting industrial nuts, can rivet nuts on plates and is widely used. For example, Chinese Patent No. 201010588266.4 discloses a nut riveter, which comprises a riveter seat, a nut adjusting mechanism arranged at a front end of the riveter seat, a nut riveting rod installed in the nut adjusting mechanism, two handles with front ends which are respectively hinged with the riveter seat through first pin shafts and fitting holes in two sides of the riveter seat, and a pull rod retractable mechanism connected to a pull rod, wherein the nut riveting rod is fixed at a front end of the pull rod; the nut riveter further comprises a screw rod with one end which is connected with the pull rod retractable mechanism through a sixth pin shaft and a screw rod outer sleeve with one end which is fixed on the pull rod retractable mechanism through threads, wherein the screw rod is arranged in a cavity of the screw rod outer sleeve; a push rod sleeves a position between the screw rod and the screw rod outer sleeve, steel balls fit with a screw groove in the screw rod are inlaid in one end of the push rod, a one-way clutch sleeves the other end of the push rod and the one-way clutch is fixed in a clutch seat; the clutch seat is connected with a withdrawing connecting rod through a fifth pin shaft and the withdrawing connecting rod is connected onto the handles through fourth pin shafts; the pull rod retractable mechanism comprises a pull rod seat, a fixed nut, second pin shafts, connecting rods and third pin shafts; the pull rod penetrates through the pull rod seat and a tail end of the pull rod is fixed on the fixed nut; the fixed nut is located in a chamber of the pull rod seat and a tail portion of the fixed nut is connected with the screw rod through the sixth pin shaft; and one end of the connecting rod is hinged with the front end of the handle through the second pin shaft and the other end of the connecting rod is connected with the pull rod through the third pin shaft.

The nut riveter in by the above-mentioned art provides improved nut riveting efficiency by riveting nuts based on the lever principle. However, the following problems often exist with conventional riveter: since the front ends of the handles are connected with the riveter seat through fastening pieces, the two handles must be pulled outwards first, and then inwards in order the grip the nut. The second pin shafts can be viewed as fulcrums of the lever principle. As the force in power arms are continuously reduced, the forced need in the resisting arms are continuously increased when the two handles are approaching each other. Consequently the force need to operate the riveter is gradually increased.

For smaller nuts, the force needed during riveting is smaller. The above-mentioned solution may be sufficient. However, for large nuts, more force is needed. In addition, when the two handles come closer to each other, the continuously increasing force may feel laborious and strenuous to its users. Particularly for people with less physical strength, the nut riveter may be hard to use. Therefore, a larger nut riveter is needed for large nuts. However, nuts of different sizes are often riveted within a short period of time during one particular operation. As a result, several nut riveters need to be carried and frequently changed during use and it is troublesome in use.

As a result, there is a need for a labor-efficient riveter that can accommodate nuts of different sizes.

SUMMARY OF THE INVENTION

In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a nut riveter which is labor-saving and convenient to rivet nuts with different sizes.

According to the technical solution of the present invention, the nut riveter can comprise a front riveter seat with a cavity, a rear riveter seat arranged in the cavity of the front riveter seat and located at a rear end of the front riveter seat, a nut adjusting mechanism arranged at a front end of the front riveter seat and a nut riveting rod installed in the nut adjusting mechanism, wherein the two sides of the rear riveter seat are respectively connected with two handles through two connecting rods; and the nut riveter can further comprise a pull rod seat located in the cavity of the front riveter seat, wherein a pull rod is inserted into the pull rod seat, a rear end of the pull rod is connected with a pull rod retractable mechanism, the two ends of the pull rod seat are respectively connected with front ends of the two handles through first pin shafts, the front ends of the handles are further connected with front ends of the connecting rods through second pin shafts, and the rear ends of the connecting rods are connected with the rear riveter seat through third pin shafts.

Further, each of the two handles can be integrally formed by two connecting plates arranged in parallel, a connecting portion can be used for connecting the two connecting plates, a clamping groove for clamping the front end of the corresponding connecting rod is formed among the two connecting plates and the connecting portion, the two connecting plates thereon are provided with first shaft holes, the two sides of the pull rod seat are respectively provided with two convex plates, a holding groove for clamping the front end of the corresponding handle is formed between the two convex plates, the convex plates thereon are provided with first positioning holes, and the first pin shafts penetrate through the first positioning holes and the first shaft holes to couple the front ends of the handles with the pull rod seat.

Further, front ends of the two connecting plates of each handle are provided with side plates formed by inward extension, the side plates thereon are provided with second shaft holes for clamping the second pin shafts, the front ends and the rear ends of the connecting rods are respectively provided with second positioning holes and third positioning holes, and the second pin shafts penetrate through the second positioning holes and the second shaft holes to couple with the front ends of the connecting rods with the front ends of the handles; a front end of the rear riveter seat is provided with insertion grooves for inserting the rear ends of the connecting rods, the rear riveter seat thereon is provided with third shaft holes matched with the third positioning holes, and the third pin shafts penetrate through the third shaft holes and the third positioning holes and hinge the rear ends of the connecting rods with the rear riveter seat.

Further, the nut adjusting mechanism can comprise a sliding sleeve which covers the front end of the pull rod and is in sliding fit with the pull rod, a sleeve which is arranged at the front end of the front riveter seat, a nut which is arranged on a front end of the sleeve and sleeves the nut riveting rod, and a spring which is located below the sliding sleeve and sleeves the pull rod.

Further, a rear end of the nut riveting rod can be provided with male threads and the male threads fits with female threads at the front end of the pull rod; the front end of the front riveter seat is in thread fit with the rear end of the sleeve, the sleeve covers the sliding sleeve and the front end of the sleeve is in thread fit with the rear end of the nut; and the spring is located between the sliding sleeve and the pull rod seat, i.e., a top end of the spring resists against a rear end of the sliding sleeve and a bottom end of the spring resists against the front end of the pull rod seat.

Further, an external portion of the rear end of the nut riveting rod can be a polygon; an external portion of the front end of the pull rod is a polygon as the same as the polygon of the rear end of the nut riveting rod; and an inner hole provided in the sliding sleeve is a polygon fit with the polygon of the front end of the pull rod.

Further, the polygon can be a regular hexagon.

Further, the pull rod retractable mechanism can comprise a fixed nut which is arranged at the rear end of the pull rod, a screw rod which is arranged at the rear end of the fixed nut through one first pin rod, a drawing rod which sleeves the screw rod, a sleeve rod which sleeves the drawing rod, an adjustable nut which is arranged at a rear end of the sleeve rod in a thread connection manner, and a knob which is arranged at a rear end of the drawing rod through one second pin rod.

Further, the rear end of the pull rod is in thread fit with a front end of the fixed nut, and a front end of the sleeve rod is in thread fit with an inner wall of the pull rod seat; and a front end of the drawing rod is provided with steel balls, and the steel balls are inlaid in a screw groove provided in the screw rod.

Further, the handles thereon can be provided with handle sleeves.

The nut riveter provided by the present invention has the advantage of, gradually reducing the pressure applied by hands when the handles are being pulled together thus achieving labor efficiency by accommodating rivet nuts of different sizes.

DETAILED DESCRIPTION

The present invention will be described below in detail in reference to the figures and the embodiments. It should be understood that the embodiments described herein are only used for the purpose of explaining the present invention and shall not be viewed as basis for limiting the scope of the present invention.

As shown inFIGS. 1-5, an embodiment of a nut riveter can comprise a front riveter seat1with a cavity, a rear riveter seat2arranged in the cavity of the front riveter seat1and located at a rear end of the front riveter seat1, a nut adjusting mechanism arranged at a front end of the front riveter seat1and a nut riveting rod3installed in the nut adjusting mechanism, wherein two sides of the rear riveter seat2each is connected to a handle5through a connecting rods4; and the nut riveter further comprises a pull rod seat6located in the cavity of the front riveter seat1, wherein a pull rod7is inserted into the pull rod seat6, a rear end of the pull rod7is connected with a pull rod retractable mechanism, two ends of the pull rod seat6are respectively connected with front ends of the two handles5through first pin shafts8, the front ends of the handles5are further connected with front ends of the connecting rods4through second pin shafts9, rear ends of the connecting rods4are connected with the rear riveter seat2through third pin shafts32, and the rear riveter seat2is also connected with the rear end of the front riveter seat1through the third pin shafts32.

Each of the two handles5is integrally formed by two connecting plates51arranged in parallel, a connecting portion52used for connecting the two connecting plates51, a clamping groove10for clamping the front end of the corresponding connecting rod4is formed among the two connecting plates51and the connecting portion52, the two connecting plates51thereon are provided with first shaft holes11, the two sides of the pull rod seat6are respectively provided with two convex plates61, a holding groove62for clamping the front end of the corresponding handle5is formed between the two convex plates61, the convex plates61thereon are provided with first positioning holes12, and the first pin shafts8penetrate through the first positioning holes12and the first shaft holes11and hinge together the front ends of the handles5with the pull rod seat6. The front ends of the two connecting plates51of each handle5are provided with side plates511formed by inward extension, the side plates511thereon are provided with second shaft holes13for clamping the second pin shafts9, the front ends and the rear ends of the connecting rods4are respectively provided with second positioning holes14and third positioning holes15, and the second pin shafts9penetrate through the second positioning holes14and the second shaft holes13to hinge the front ends of the connecting rods4with the front ends of the handles5together; a front end of the rear riveter seat2is provided with insertion grooves16for inserting the rear ends of the connecting rods4, the rear riveter seat2thereon is provided with third shaft holes17matched with the third positioning holes15, and the third pin shafts32penetrate through the third shaft holes17and the third positioning holes15to hinge together the rear ends of the connecting rods4with the rear riveter seat2.

The nut adjusting mechanism comprises a sliding sleeve18which covers the front end of the pull rod7and is in sliding fit with the pull rod7, a sleeve19which is arranged at the front end of the front riveter seat1, a nut20which is arranged on a front end of the sleeve19and sleeves the nut riveting rod3, and a spring21which is located below the sliding sleeve18and sleeves the pull rod7. A rear end of the nut riveting rod3is provided with male threads and the male threads are fit with female threads at the front end of the pull rod7; the front end of the front riveter seat1is in thread fit with the rear end of the sleeve19, the sleeve19covers the sliding sleeve18and the front end of the sleeve19is in thread fit with the rear end of the nut20; and the spring21is located between the sliding sleeve18and the pull rod seat6, i.e., a top end of the spring21resists against a rear end of the sliding sleeve18and a bottom end of the spring21resists against the front end of the pull rod seat6. An external portion of the rear end of the nut riveting rod3is a polygon; an external portion of the front end of the pull rod7is a polygon as the same as the polygon of the rear end of the nut riveting rod3; and an inner hole provided in the sliding sleeve18is a polygon fit with the polygon of the front end of the pull rod7. During operation, the sliding sleeve18is pulled down by using hands, the nut riveting rod3and the pull rod7are screwed together by using hands, and the sliding sleeve18is consequently loosened to enable the sliding sleeve18to cover the pull rod7and the nut riveting rod3together. The nut riveting rod3and the pull rod7are in thread connection to guarantee the tensile strength, and simultaneously the polygon of the pull rod7and the polygon of the nut riveting rod3are sleeved together through the polygon of the sliding sleeve18to guarantee that the nut riveting rod3and the pull rod7are not loosened during working. As a preferred embodiment of the present invention, the polygon is a regular hexagon.

The pull rod retractable mechanism comprises a fixed nut22which is arranged at the rear end of the pull rod7, a screw rod23which is arranged at the rear end of the fixed nut22through one first pin rod33, a drawing rod24which sleeves the screw rod23, a sleeve rod25which sleeves the drawing rod24, an adjustable nut26which is arranged at a rear end of the sleeve rod25in a thread connection manner, and a knob28which is arranged at a rear end of the drawing rod24through one second pin rod27. The rear end of the pull rod7is in thread fit with a front end of the fixed nut22, and a front end of the sleeve rod25is in thread fit with an inner wall of the pull rod seat6; and a front end of the drawing rod24is provided with steel balls29, and the steel balls29are inlaid in a screw groove30provided in the screw rod23.

The handles5thereon are provided with handle sleeves31, which can play roles of preventing slippery and protecting the hands.

When the nut riveter provided by the present invention is used for riveting nuts, firstly two hands are used to hold the two handles5to open the two handles5, a nut to be processed is installed on the nut riveting rod, then a force is applied to close the two handles5, the pull rod7moves rearwards under the effect of the pull rod retractable mechanism during closing and thereby the nut is riveted on a workpiece; and after the riveting is completed, the two handles5are opened again, then the knob28is pulled, the steel balls29at the front end of the drawing rod24move in the screw groove of the screw rod23through the arrangement of the sleeve rod25and the drawing rod24, the screw rod23drives the pull rod7to rotate together, the pull rod7drives the nut riveting rod3to rotate together and the nut riveting rod3is withdrawn from the riveted nut. Of course, the above-mentioned nut riveting manner is just a preferred embodiment of the present invention. During actual design, the structure of the pull rod retractable mechanism can also be changed to a simpler form, i.e., the length of the screw rod23is shortened, the drawing rod24and the sleeve rod25are not arranged, the nut riveting rod3is taken down from the riveted nut in a manner of rotating the knob28after the riveting is completed, the structure is simple and the use cost is low. However, it is troublesome to use the pull rod retractable mechanism designed in the structure, the knob28needs to be uninterruptedly rotated and considerable time is consumed; and however, although the structure of the pull rod retractable mechanism provided by the present invention is complex, the pull rod retractable mechanism is convenient to use and the nut riveting rod3can be more quickly taken down from the riveted nut. Therefore, during actual use, the structure of the pull rod retractable mechanism can be selected according to different use demands.

In addition, the nut riveting rod3in the present invention is convenient to be replaced. During replacement, the sliding sleeve18is pulled rearwards to enable the polygon portion of the rear end of the nut riveting rod3to be separated from the inner hole of the sliding sleeve18, the spring is compressed at this moment, then the nut riveting rod3is screwed out from the front end of the pull rod7, a new nut riveting rod3is fixed to the front end of the pull rod7through threads, finally the sliding sleeve18is released, the sliding sleeve18restores to an original position under the effect of the elastic force of the spring21, and thereby the sliding sleeve18sleeves the pull rod7and the new nut riveting rod3together to complete the replacement of the nut riveting rod3.

As shown inFIGS. 6 and 7, in the prior art, L1 are power arms when the handles are opened, L2 are resisting arms when the handles are opened, L3 are power arms when the handles are closed, L4 are resisting arms when the handles are closed, F1 and F3 are power, F2 and F4 are resistance, F1*L1=F2*L2, F3*L3=F4*L4, the power arms are kept unchanged when the nut riveter moves from a state as shown inFIG. 6to a state as shown inFIG. 7, i.e., F2=F4 and the power is gradually increased, i.e., F1<F3; and as shown inFIGS. 8 and 9, in the present invention, L5 are power arms when the handles5are opened, L6 are resisting arms when the handles5are opened, L6 are power arms when the handles5are closed, L6 are resisting arms when the handles are closed, F5 and F6 are power, F7 and F8 are resistance, F5*L5=F6*L6, F7*L7=F8*L8, the power arms are kept unchanged when the nut riveter moves from a state as shown inFIG. 8to a state as shown inFIG. 9, i.e., L5=L7, the resisting arms are gradually increased, and the power is gradually decreased, i.e., F5>F7, in order to keep the resistance unchanged, i.e., F6=F8. In addition, since the handles of the nut riveter in the prior art are connected with the front riveter seat, due to the limitation of the structure, the handles cannot move forwards or rearwards even though the front ends of the handles can rotate through the pin shafts, and thereby the resisting arms are larger at the begging of the riveting of the nut during use after the handles are connected with the connecting rods; and however, the handles5of the present invention are not connected with the front riveter seat, the handles5work independent of the front riveter seat, the handles5and the pull rod seat6simultaneously move towards the front portion of the front riveter seat1when the handles5are opened, the handles5and the pull rod seat6simultaneously move towards the rear portion of the front riveter seat1when the handles5are closed, the handles5and the connecting rods4can move freely, the resisting arms can be set to a smaller extent after the handles5are connected with the connecting rods4, thereby the resisting arms at the beginning of the riveting of the nut are smaller and it is more labor-saving in use.

According to the nut riveter provided by the present invention, the pull rod7is inserted into the pull rod seat6, the rear end of the pull rod7is connected with the pull rod retractable mechanism, the two ends of the pull rod seat6are respectively connected with the front ends of the two handles5through the first pin shafts8, the front ends of the handles5are further connected with the front ends of the connecting rods4through the second pin shafts9, the rear ends of the connecting rods4are connected with the rear riveter seat2through the third pin shafts32, the handles5are not connected with the front riveter seat1, i.e., the handles5work independent of the front riveter seat1, the pressure applied by the hands is gradually reduced when the handles5are closed, and the nut riveter can be labor-saving during use and can rivet nuts with different sizes.

Of course, the above-mentioned embodiments are just preferred embodiments of the present invention, and do not limit the patent range of the present invention thereby. All simple modifications and equivalent structural changes made by using the contents of the description and the drawings of the present invention shall also be included in the patent protection range of the present invention.