Rivet removal pliers

Abstract

The present invention provides rivet extraction pliers that allow the locking pin of a plastic rivet to be easily pulled out in a direction approximately perpendicular to the mounting surface of a grommet. [Solution] When a plastic rivet consisting of a grommet 40 and a lock pin 42 is attached to the vehicle body B, the tips of the claws 12N and 24N are aligned in the gap between the inner circumference of the grommet 40 and the head of the lock pin 42, and the grips 18 and 14 are held close to each other, so that the tips of the claws 12N and 24N bite into the gap between the inner circumference of the grommet 40 and the head of the lock pin 42, and subsequently the claws 12 With the tips of N and claw portion 24N biting into the gap between the inner circumference of the grommet 40 and the head of the lock pin 42, the grips 18 and 14 are gripped so that they are closer to each other, causing the tips of the branch portions 20A and 22A of the upper jaw guide member 20 and the lower jaw guide member 22 to protrude beyond the tips of claw portions 12N and 24N toward the flat mounting surface of the vehicle body B and press against the outer edge of the grommet 40 on the flat mounting surface of the vehicle body B. As a result, the tips of the branch portions 20A and 22A of the upper jaw guide member 20 and the lower jaw guide member 22 press against the outer edge of the grommet 40 on the flat mounting surface of the vehicle body B, exceeding the tips of the claw portions 12N and 24N. In reaction, the guide pin 24P is moved and guided toward the end of the guide hole 20g, and the guide pin 12P is moved and guided toward the end of the guide hole 22g. Meanwhile, the tips of the claw portions 12N and 24N and the head of the lock pin 42 are easily and automatically pulled upward in a direction approximately perpendicular to the flat mounting surface of the vehicle body B.

Description

Technical Field

[0001] The present invention relates to a puller for rivets.

Background Art

[0002] As one type of rivet, a plastic rivet made of resin has been put into practical use as shown in, for example, Patent Document 1 and Patent Document 2. The above-mentioned plastic rivet is configured to include, for example, a grommet and a lock pin. The lower end of the lock pin is pushed into the central hole of the grommet provided in the common mounting hole of the two plate-like members until the head of the lock pin, which is larger than the inner diameter of the grommet, abuts against the grommet. By the clamping force that expands the legs of the grommet in the radial direction of the mounting hole of the grommet, the two plate-like members are fastened. The plastic rivet is used, for example, as shown in Patent Document 1, to fix, for example, a resin door in a cooking appliance and a metal door arranged inside thereof. Further, the plastic rivet is used, for example, as shown in Patent Document 2, to sandwich and fasten a light source unit and a lens unit. When pulling out the lock pin of the plastic rivet in order to disassemble the two plate-like members fastened as described above, generally, a manual tool called a clip clamp plier or a clip plier is used as a puller for rivets. Such a clip clamp plier has claw portions at the tip ends of each grip of the clip clamp plier for sandwiching the head of the lock pin of the plastic rivet and pulling it out from the grommet. With the claw portions of the clip clamp plier inserted into the gap between the head of the lock pin and the inner peripheral portion of the grommet, when the clip clamp plier is pushed down in a state where each grip of the clip clamp plier is squeezed by the palm and fingers, the claw portions are lifted, and by the principle of a lever, the lock pin is pulled up and pulled out from the mounting hole together with the grommet.

Prior Art Documents

Patent Documents

[0003] [Patent Document 1] Japanese Patent Publication No. 62-283592 [Patent Document 2] Japanese Patent Publication No. 2013-225455 [Overview of the project] [Problems that the invention aims to solve]

[0004] However, when the claws of the clip clamp pliers are inserted into the gap between the head of the plastic rivet's lock pin and the inner circumference of the grommet, the claws and the grips of the clip clamp pliers are inclined relative to the grommet's mounting surface. This makes it difficult to pull out the lock pin head in a direction approximately perpendicular to the grommet's mounting surface, which can cause bending stress on the lock pin and damage to its head.

[0005] Considering the above problems, the present invention aims to provide rivet extraction pliers that can easily extract the lock pin of a plastic rivet in a direction substantially perpendicular to the mounting surface of a grommet. [Means for solving the problem]

[0006] To achieve the above objective, the rivet pulling pliers according to the present invention comprises: a fixed handle having a grip at the bottom and a claw portion and a guide pin at its tip; a drive link member having an intermediate portion that overlaps the middle portion of the fixed handle, the intermediate portion being rotatably connected to the middle portion of the fixed handle, and having a claw portion and a guide pin formed at its tip opposite to the claw portion at the tip of the fixed handle; a movable handle having a grip at the bottom and an intermediate portion that overlaps the lower end of the drive link member, the intermediate portion being rotatably connected to the lower end of the drive link member so that the grip can move closer to or further away from the grip of the fixed handle; an upper jaw guide member having a base end portion rotatably connected to the tip of the movable handle, a branch portion having a slit in which the claw portion of the drive link member is movably arranged, a guide hole formed in the branch portion for guiding the guide pin of the drive link member; a base end portion facing the upper jaw guide member and rotatably connected concentrically to the tip of the movable handle, and a branch portion having a slit in which the claw portion of the tip of the fixed handle is movably arranged The device comprises a lower jaw guide member having a guide hole formed in the branching portion that guides the guide pin at the tip of the fixed handle, a first return spring disposed between the intermediate portion of the drive link member and the intermediate portion of the fixed handle, and a second return spring disposed between the lower end of the drive link member and the intermediate portion of the movable handle, having a spring constant different from that of the first return spring. When the grip of the movable handle is brought close to the grip of the fixed handle while the head of the lock pin constituting the rivet attached to the mounting surface is sandwiched between the claw portion at the tip of the fixed handle and the claw portion formed at the tip of the drive link member, the tips of the branching portions of the upper jaw guide member and the lower jaw guide member protrude beyond the claw portion at the tip of the fixed handle and the claw portion formed at the tip of the drive link member, pressing against the area around the rivet on the mounting surface, the guide hole guides the guide pin of the drive link member, and the guide hole also guides the guide pin at the tip of the fixed handle, so that the head of the lock pin constituting the rivet is pressed against the claw portion at the tip of the fixed handle, andThe claw portion formed at the tip of the drive link member is characterized by being pulled up in a direction substantially perpendicular to the mounting surface.

[0007] Furthermore, the first return spring and the second return spring may each be torsion springs. The first return spring may be placed in a groove formed between the interior of the intermediate portion of the drive link member and the interior of the intermediate portion of the fixed handle. The second return spring may be placed in a groove formed between the interior of the lower end portion of the drive link member and the interior of the intermediate portion of the movable handle.

[0008] Furthermore, the drive link member may be configured such that the relative position of the claw portion of the drive link member to the claw portion of the fixing handle is returned to its initial position based on the biasing force of the first return spring, and the relative positions of the movable handle and the branch portions of the upper jaw guide member and lower jaw guide member to the fixing handle are returned to their initial positions based on the biasing force of the second return spring. [Effects of the Invention]

[0009] According to the rivet extraction pliers of the present invention, when the head of the lock pin constituting a rivet attached to a mounting surface is held between the claw portion at the tip of the fixed handle and the claw portion formed at the tip of the drive link member, and the grip of the movable handle is brought close to the grip of the fixed handle, the tips of the branch portions of the upper jaw guide member and the lower jaw guide member protrude beyond the claw portion at the tip of the fixed handle and the claw portion formed at the tip of the drive link member, and press against the area around the rivet on the mounting surface, the guide hole guides the guide pin of the drive link member and the guide hole also guides the guide pin at the tip of the fixed handle, so that the claw portion at the tip of the fixed handle and the claw portion formed at the tip of the drive link member are pulled up in a direction substantially perpendicular to the mounting surface along with the head of the lock pin constituting the rivet, so that the lock pin of the plastic rivet can be easily extracted in a direction substantially perpendicular to the mounting surface of the grommet. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view showing the appearance of an example of rivet extraction pliers according to the present invention, with the drive link member viewed directly from the front. [Figure 2] This is a perspective view showing the appearance of an example of rivet extraction pliers according to the present invention, with the fixed handle viewed directly from the front. [Figure 3] Figure 2 is an exploded perspective view of an example of rivet extraction pliers. [Figure 4] Figure 1 is a front view of an example of rivet extraction pliers. [Figure 5] Figures (A), (B), and (C) are diagrams illustrating the operation of the pliers in each step of the process of pulling out the lock pin of a plastic rivet, using an example of the rivet pulling pliers according to the present invention. [Modes for carrying out the invention]

[0011] Figure 1 shows an example configuration of rivet extraction pliers according to the present invention.

[0012] In Figure 1, the rivet removal pliers 10 mainly consist of a fixed metal handle 12 having a press-fitted resin grip 14 at its lower end, a movable metal handle 16 having a press-fitted resin grip 18 at its lower end, a metal drive link member 24 rotatably connected to the middle portion of the fixed handle 12 and rotatably connected to the middle portion of the movable handle 16, a metal lower jaw guide member 22 rotatably connected to the upper part of the movable handle 16, and a metal upper jaw guide member 20.

[0013] As shown in Figures 2 and 3, the fixed handle 12, formed from a plate-shaped member, has a screw hole 12a in its curved intermediate portion 12B. The male thread of the connecting pin 32 is screwed into the screw hole 12a via the hole 24a of the drive link member 24 and the torsion spring 26. A shallow groove 12ga is formed around the periphery of the screw hole 12a, and the torsion spring 26 is inserted into the space between the shallow groove 24ga formed around the periphery of the hole 24a of the drive link member 24, which is superimposed on the intermediate portion 12B of the fixed handle 12, and the aforementioned shallow groove 12ga. One end of the torsion spring 26, which acts as a first return spring for returning the claw portion 12N and the claw portion 24N to their initial positions, is engaged with a notch in the shallow groove 24ga of the drive link member 24, and the other end of the torsion spring 26 is engaged with a notch in the shallow groove 12ga of the fixed handle 12.

[0014] Around the groove 12ga, a guide groove 12gb is formed into which the stopper pin 24P of the drive link member 24, which is superimposed on the intermediate portion 12B of the fixed handle 12, is inserted. At the very tip of the tip portion 12A, which is located in front of the position of the screw hole 12a on the fixed handle 12, a claw portion 12N is formed that protrudes diagonally upward. On one side of the tip portion 12A, a guide pin 12P is formed which is inserted into the elongated guide hole 22g of the lower jaw guide member 22, which will be described later.

[0015] The movable handle 16, formed from a plate-shaped member, has a screw hole 16b in its intermediate portion 16B. The male thread of the connecting pin 36 is screwed into the screw hole 16b via the hole 24b of the drive link member 24 and a torsion spring 28. A shallow groove 16gb is formed around the periphery of the screw hole 16b. The torsion spring 28 is inserted into the space between the shallow groove 24gb formed around the periphery of the hole 24b of the drive link member 24, which is superimposed on the intermediate portion 16B of the movable handle 16, and the aforementioned shallow groove 16gb. The torsion spring 28, acting as a second return spring, is intended to return the movable handle 16, the upper jaw guide member 20, and the lower jaw guide member 22 to their initial positions. One end of the torsion spring 28 is engaged with a notch in the shallow groove 24gb of the drive link member 24, and the other end of the torsion spring 28 is engaged with a notch in the shallow groove 16gb of the movable handle 16. The spring constant of the torsion spring 28 is set to a different value from the spring constant of the torsion spring 26 described above.

[0016] At the very tip of the tip portion 16A, which forms the upper part of the movable handle 16 above the position of the screw hole 16b, a guide member connecting portion 16C having a female screw hole 16a is formed. On one side of the guide member connecting portion 16C of the movable handle 16, the base end portion 22B of the lower jaw guide member 22 is rotatably connected to the female screw 16a via the hole 22a and a connecting pin 34. On the other side of the guide member connecting portion 16C of the movable handle 16, the base end portion 20B of the upper jaw guide member 20 is rotatably connected to the female screw hole 16a via the hole 22a and a connecting pin 30. The guide member connecting portion 16C has a female screw 16a into which the male threads of the connecting pins 34 and 30 are screwed concentrically.

[0017] The L-shaped drive link member 24 has an intermediate portion 24B through which a connecting pin 32 passes, and a tip portion 24A having a claw portion 24N that protrudes diagonally downward. A hole 24b through which a connecting pin 36 passes is formed at the lower end of one side of the drive link member 24. A shallow groove 24gb is formed around the periphery of the hole 24b.

[0018] At the tipmost end of the tip portion 24A that forms the tip beyond the position of the hole 24a in the drive link member 24, a claw portion 24N that protrudes obliquely downward is formed. The claw portion 24N is located directly above the claw portion 12N of the tip portion 12A of the fixed handle 12 described above and faces the claw portion 12N. On one side surface of the tip portion 24A, a guide pin 24P that is inserted into the elongated guide hole 20g of the upper jog guide member 20 described later is formed.

[0019] The lower jog guide member 22 includes a base end portion 22B having a hole 22a into which the above-described connecting pin 34 is inserted, and a branch portion 22A that is integrally formed with the base end portion 22B and has a slit 22S in which the tip portion 12A of the fixed handle 12 is movably arranged. On one side portion of the branch portion 22A, an elongated guide hole 22g into which the guide pin 12P of the fixed handle 12 is inserted is formed. The guide hole 22g extends for a predetermined length in the longitudinal direction of the branch portion 22A.

[0020] The upper jog guide member 20 includes a base end portion 20B having a hole 20a into which the above-described connecting pin 30 is inserted, and a branch portion 20A that is integrally formed with the base end portion 20B and has a slit 20S in which the tip portion 24A of the drive link member 24 is movably arranged. On one side portion of the branch portion 20A, an elongated guide hole 20g into which the guide pin 24P of the drive link member 24 is inserted is formed. As shown in FIG. 4, the guide hole 20g extends for a predetermined length in the longitudinal direction of the branch portion 20A.

[0021] In such a configuration, as shown in FIG. 2, when the movable handle 16 is closest to the fixed handle 12 and the distance between the claw portion 24N and the claw portion 12N is minimized, in FIG. 2, the guide pin 12P shown by the solid line abuts against one end of the guide hole 22g. On the other hand, when the movable handle 16 is most separated from the fixed handle 12 and the distance between the claw portion 24N and the claw portion 12N is maximized, in FIG. 2, the guide pin 12P shown by the solid line is moved, for example, to the position of the guide pin 12P shown by the broken line in the guide hole 22g.

[0022] Furthermore, when the grip 18 of the movable handle 16 is grasped with the fingers so that it is closer to the grip 14 of the fixed handle 12 than the position shown in Figures 1 to 4, the guide pin 12P is moved closer to the other end of the guide hole 22g than, for example, the position of the guide pin 12P shown by the dashed line, and the guide pin 24P is moved closer to the other end of the guide hole 20g. As a result, the tips of the branch portions 20A and 20B of the upper jaw guide member 20 and the lower jaw guide member 22 protrude forward beyond the claw portions 12N and 24N.

[0023] As shown in Figure 5(A), for example, when a plastic rivet consisting of a grommet 40 and a lock pin 42 is attached to the vehicle body B, when the plastic rivet is removed from the mounting hole on the flat mounting surface of the vehicle body B using the rivet removal pliers 10 described above, first, the grip 18 of the movable handle 16 of the rivet removal pliers 10 is gripped so that it is further separated from the grip 14 of the fixed handle 12 from the state shown in Figure 1, and the separated claws 12N and 24N are positioned directly above the plastic rivet. Next, as shown in Figure 5(B), the tips of the claws 12N and 24N are aligned with the gap between the inner circumference of the grommet 40 and the head of the lock pin 42, and the grips 18 and 14 are held close to each other, so that the tips of the claws 12N and 24N bite into the gap between the inner circumference of the grommet 40 and the head of the lock pin 42, and subsequently the tips of the claws 12N and 24N bite into the gap between the inner circumference of the grommet 40 and the head of the lock pin 42 As grips 18 and 14 are gripped so that they are closer to each other while being bitten into the gap with the head of 2, the tips of the branch portions 20A and 22A of the upper jaw guide member 20 and the lower jaw guide member 22 protrude beyond the tips of the claw portions 12N and 24N toward the flat mounting surface of the vehicle body B, as shown by the dashed line in Figure 5(B), and contact and press against the outer peripheral edge of the grommet 40 on the flat mounting surface of the vehicle body B. As a result, the tips of the branch portions 20A and 22A of the upper jaw guide member 20 and the lower jaw guide member 22 come into contact with and press against the outer peripheral edge of the grommet 40 on the flat mounting surface of the vehicle body B, beyond the tips of the claw portions 12N and 24N. In reaction, as shown by the dashed line in Figure 5(B), the guide pin 24P is moved and guided toward the end of the guide hole 20g, and the guide pin 12P is moved and guided toward the end of the guide hole 22g. The tips of the claw portions 12N and 24N and the head of the lock pin 42 are easily and automatically pulled upward in a direction approximately perpendicular to the flat mounting surface of the vehicle body B, as shown by the arrows in Figure 5(B).In this case, the head of the lock pin 42 is easily and automatically pulled upward in a direction approximately perpendicular to the flat mounting surface of the vehicle body B, thus preventing bending stress from acting on the lock pin 42.

[0024] Then, as shown in Figure 5(C), the tips of the claws 12N and 24N and the head of the lock pin 42 are further pulled up in the direction of the arrows shown in Figure 5(C), thereby removing the grommet 40 from the mounting hole (not shown) on the flat mounting surface of the vehicle body B.

[0025] Therefore, by using the rivet extraction pliers 10, the lock pin 42 of the plastic rivet can be easily pulled out in a direction approximately perpendicular to the mounting surface of the grommet 40.

[0026] In the above example, an example of using an example of rivet extraction pliers according to the present invention is applied to a plastic rivet consisting of a grommet 40 and a lock pin 42. However, the invention is not limited to such an example and may also be applied to the removal of trim clips, push-turn rivets, canoe clips (registered trademark), etc. [Explanation of symbols]

[0027] 10. Rivet removal pliers 12 Fixed handle 12N claw part 12P Guide Pin 16. Movable handle 20 Upper jaw guide member 22 Lower jaw guide member 24 Drive link member 24N claw part 24P guide pin 26, 28 Torsion springs

Claims

1. A fixed handle having a grip at the bottom and a claw portion and guide pin at the tip, A drive link member having an intermediate portion that overlaps with the intermediate portion of the fixed handle, the intermediate portion being rotatably connected to the intermediate portion of the fixed handle, and having a claw portion and a guide pin formed at the tip of the fixed handle opposite to the claw portion at the tip of the fixed handle, A movable handle having a grip at its lower end and an intermediate portion that overlaps with the lower end of the drive link member, wherein the intermediate portion is rotatably connected to the lower end of the drive link member such that the grip can move closer to or further away from the grip of the fixed handle, An upper jaw guide member having a base end rotatably connected to the tip of the movable handle, a branching portion having a slit in which the claw portion of the drive link member is movably arranged, a guide hole formed in the branching portion for guiding the guide pin of the drive link member, A lower jaw guide member having a base end that is connected to the tip of the movable handle so as to be rotatable concentrically and opposite to the upper jaw guide member, a branching portion having a slit in which the claw portion of the tip of the fixed handle is movably arranged, and a guide hole formed in the branching portion for guiding the guide pin of the tip of the fixed handle, A first return spring is disposed between the intermediate portion of the drive link member and the intermediate portion of the fixed handle, The drive link member comprises a second return spring disposed between the lower end and the intermediate portion of the movable handle, and having a spring constant different from that of the first return spring. When the head of a lock pin constituting a rivet attached to the mounting surface is held between the claw portion at the tip of the fixed handle and the claw portion formed at the tip of the drive link member, and the grip of the movable handle is brought close to the grip of the fixed handle, the tips of the branch portions of the upper jaw guide member and the lower jaw guide member protrude beyond the claw portion at the tip of the fixed handle and the claw portion formed at the tip of the drive link member, and press against the area around the rivet on the mounting surface, A rivet extraction pliers characterized in that the guide hole guides the guide pin of the drive link member, and the guide hole also guides the guide pin at the tip of the fixed handle, thereby pulling up the claw portion at the tip of the fixed handle and the claw portion formed at the tip of the drive link member, along with the head of the lock pin constituting the rivet, in a direction substantially perpendicular to the mounting surface.

2. The rivet extraction pliers according to claim 1, characterized in that the first return spring and the second return spring are each torsion springs.

3. The rivet pulling pliers according to claim 1, characterized in that the first return spring is disposed in a groove formed between the interior of the intermediate portion of the drive link member and the interior of the intermediate portion of the fixed handle.

4. The rivet pulling pliers according to claim 1, characterized in that the second return spring is disposed in a groove formed between the inside of the lower end of the drive link member and the inside of the intermediate portion of the movable handle.

5. The rivet pulling pliers according to claim 1, characterized in that the relative position of the claw portion of the drive link member with respect to the claw portion of the fixed handle is returned to its initial position based on the biasing force of the first return spring, and the relative positions of the movable handle and the branch portions of the upper jaw guide member and lower jaw guide member with respect to the fixed handle are returned to their initial positions based on the biasing force of the second return spring.

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