MXPA98003819A - Rivet plast - Google Patents

Abstract

The present invention relates to a plastic rivet for securing two members that pass through an orifice aligned in the members, the rivet is formed of an elastic material and comprises: a driving pin having a head, a pin projecting from a lower surface of the head and first locking mechanisms located at a distal end of the spike, and a body having a head and an elongated portion, the elongated portion is inserted into the hole and has a plurality of longitudinal members projecting from a lower surface of the head, the longitudinal members are conical radially outwardly from a longitudinal axis of the elongate portion, a distal end of each of the longitudinal members is interconnected by a nose, the nose is coned radially inwardly toward the axis longitudinal, a space between the longitudinal members defines a corridor, the corridor extends to the Each one of the longitudinal members includes a first coupling surface located at the distal end, in which the pin is partially insertable in the passageway so that the locking mechanisms come into contact with the first coupling surfaces, imparting a retaining force on the drag claw, counterposing the drag claw being removed from the aisle, wherein when the drag claw is fully inserted into the aisle, the first locking mechanisms come into contact with the second engaging surfaces, imparting a retaining force on the trailing nail counterposing the pulling finger being extracted from the passage, the shank counterposing the longitudinal members being biased inward toward the longitudinal axis, thereby counterposing the body being removed from the orifice and , in which a plurality of elastic legs are projected longitudinally from the end dis of the spike, the first locking mechanisms comprise a protrusion projecting radially outwardly from each of the legs, the body having a plurality of transverse grooves defining the first coupling surfaces, each of the distal ends of the legs. longitudinal members have a shoulder defining second mating surfaces, the legs are bent inwardly while the trailing nail is dragged on the body, then the legs relax when the trailing nail is dragged completely inside the body

Description

PLASTIC RIVET BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a plastic rivet, and more particularly, to a plastic rivet comprising a body which has an elongated portion and a driving pin. DESCRIPTION OF THE PRIOR ART Typically, plastic rivets are used to join two or more members. Plastic rims generally have a pin portion that is inserted into a portion of the body. The body has a head, a rod and an axial inner diameter in the rod to receive the pin. The body is inserted into the aligned holes in the members that are to be joined by the plastic rivet. The pin is driven within the inside diameter of the body and causes the body to expand radially. The expansion of the rod offers a resistance for the removal of the stem from the holes, therefore holding the limbs. The body shank of a typical plastic rivet includes two or more teeth with the ability to deviate. When the pin is fully inserted into the axial internal diameter of the body, the teeth expand to prevent removal of the body from the aligned holes of the joined members. This is possible to deform or fracture the teeth of a typical plastic rivet after starting the incersion of the rod in the holes of the members to be joined if, for example, the holes are not perfectly aligned or the diameter of the holes is smaller than the bra. It is known that the pins of the plastic rivets are previously driven into the body and are retained therein by means of friction, this is described in U.S. Patent No. 4,830,556 for "Flexible Rivet Having Flexible Drive Pin." (Flexible rivet that has a flexible drag nail.) However, it is known that the force to retain the pin inside the body in these plastic rivets is unacceptably low. This low retention force allows the pin in these rivets to leave the body, thus increasing installation time and cost. The pin of the plastic rivets of the prior art typically has a head and a rod, wherein the rod is inserted into the axial inner diameter of the body. The pin stud of the typical plastic rivet is substantially solid. In this way, it is the shank of the body that must expand during the process of action of the pin inside the body. The resultant force requires a complete action of the pin in the body which is * unacceptably high. Thus, in order to align these problems an object of the present invention is to provide a plastic rivet in which a low incerssion force is needed to fully drive the drive pin into the body. Another object of the present invention is to provide a plastic rivet in which the driving pin previously sectioned is retained within the body with a high holding force. Another objective of this The invention is to provide a plastic rivet where a portion of the trailing claw easily collapses while the trailing claw cuts or is inserted into the body, thus reducing or eliminating body expansion. Still another object of the present invention is providing a plastic rivet where the elongated portion of the body does not interfere with the incersion of the body in the holes of the members to be joined. SUMMARY OF THE INVENTION Both the above objectives and other objectives are obtained in accordance with the present invention to provide a plastic rivet having a drag nail and a body. The body has a head and a stem. The distal end of the body shank has a closed nose or conical tip, which is inserted into the aligned holes on the members that are going to join. The body has a longitudinal I7 passage that extends through the head and the stem. The drag nail also has a head and a rod, the rod is inserted into the passage of the body. The distal end of the trailing nail rod has flexible legs 5 which have protuberances to engage with the matching surface in the body shank. The trailing nail is inserted in the longitudinal passage of the body, and prevents collapse of the body, thus preventing the removal of the body from the members to be joined. 10 BRIEF DESCRIPTION OF THE DRAWINGS In the annex drawings: Figure 1 is a perspective view of a plastic rivet according to the present invention; Figure 2 is a cross-sectional view of a plastic rivet in a disassembled state; Figure 3 is a cross-sectional view of a plastic rivet in a previously actuated state; and Figure 4 is a cross-sectional view of a plastic rivet in a fully actuated condition. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The aforementioned figures illustrate a plastic rivet 10 in which identical numbers in each figure represent identical elements. As illustrated in FIG. 1, the plastic rivet 25 has a drag nail 12 and a body 14; the body 14 has a head 16 completely molded into an elongate portion 18. The elongated portion 18 has a pair of longitudinally opposite, diametrically opposed members projecting from the head 16. The longitudinal members 20 have a tapered shape outwardly, of the longitudinal axis of the body 14 and interconnected at their respective distal ends 22 by means of the nose or tip 24. The nose or tip 24 is tapered inward from the distal ends 22 of the longitudinal members 20 to form a tip 26 The longitudinal passage 28 extends through the head 16, between the longitudinal members 20 towards the point 26 of the nose or tip 24. The passage 28 is blind (no exit). It means that the passage 28 does not extend through the point 26 of the nose 24. Thus, the elongated portion 18 is closed in a double cone. The pair of diametrically opposed matching surfaces 30 are formed in the connection of the nose 24 and the longitudinal members 26, as will be described in more detail below. The pair of diametrically opposed slots 32 are molded in the longitudinal members 24 generally near the connection of the proximal ends of the longitudinal members 20 towards the head 16. The elongated portion 18 is inserted into the aligned holes 34 of the members 36 to join them in such a way that the head 16 protrudes from the members 36. The head 16 can have any design which allows the head 16 to protrude from the members 36 without passing through I "through the holes 32. The drive nail 12 has a head 38 completely molded with rod 40. Preferably, head 38 has a circular shape The distal end 42 of rod 40 includes a pair of diametrically opposing resilient legs 44. Protrusion 46 projects radially outward from each leg 44. The rod 40 of the driving claw 12 includes a transverse hole 48. The hole # transverse 48 preferably extends from the base of the head 38 and generally has a rectangular shape. The transverse hole 48 forms a pair of walls 50 in the rod 40. The protrusion 52 projects radially outwardly from each wall 50, and the protrusions 51 are generally placed centrally along the leg of the transverse hole 48.

Preferably the drag nail 12 and the body 14 are completely molded as one piece. The drag nail 12 and the body 14 can be molded separately if so required by the design indications. Whether it is molded in an integral way or for, the drag nail 12 and the body 14 each is composed of a resilient material, preferably nylon 6/6. If they are integrally molded as a part, the drag claw 12 and the body 14 are connected by means of a fragile portion. Preferably, the frangible portion connects the distal end of the drive nail 12 to the outer surface of the head 16 of the body 14.

Preferably, the driving claw 12 is previously driven in the body 14 as indicated in FIG. 3. In this pre-actuated state the driving claw 12 is partially inserted into the body 14 such that the protrusions 46 they engage in the slots 32. The slots 32 and the protrusions 46 can have any design, in which the high holding force is imparted on the matching surface of the slots 32 and the protrusions 46, thus opposing or offering resistance to the separation of the dragging nail 12 from the body 14, during, for example, shipping and installation. As a result of this, the cost and assembly time are reduced. The protrusion 46 has a ramp 56 and a flange or flange 58. The angle formed between the ramp 56 and the rod 40 must allow the driving claw 12 to be inserted into the transverse passage 28 with a minimum amount of force. This angle is preferably between 15 and 20 degrees. The flange 28 forms a matching surface of the protrusion 46 which engages with the groove 32 when the drive nail 12 is in a pre-action state. The angle formed between the flange 58 and the rod 40 must offer a retention force between the protrusion 46 and the groove 32, thus precluding the removal of the drag nail 12 from the body 14. This angle is preferably of 75 degrees to maximize the holding force between the dragging finger 12 and the body 14. Similarly *, the protrusions 52 have a ramp 64 and a flange 66, preferably of a profile substantially to the protrusions 46. The slots 32 have a ramp 60 and a flange 62 5 to form a profile, which generally complements the profile of the protrusions 46 and 52. When in a pre-actuated state, the flange 66 protrudes from the flange 62 forming on the mating surfaces of slots 32 and protrusions 46. The matching surface 30 preferably has the shape of a flange that complements the profile of the protrusions 46 it will be understood that design considerations may require other protrusions profiles 46 protrusions 52 grooves 32 and matching surfaces 30. The body 40 is inserted into the holes aligned 32 of the members 36 to be joined, such that the lower surface of the head 16 protrudes out from the members 36. The plastic rivet 10 is sized to have a particular range of hole diameter 34 for proper clamping members 36. In particular the diameter of the orifice 34 of the inner part of the members 36 must be within the specified ranges. In the pre-actuated stage, the longitudinal members 20 have a conical shape outwardly from the head 16 so that the widest point of the elongated portion 18 is located at the junction between longitudinal members 20 and the nose or tip. The widest point of the elongate portion 18 is larger than the diameter of the holes 34. When the elongated portion 18 is inserted into the holes 34, the sliding action of the nose 24 in the holes 34 causes the longitudinal members 20 to bend 5 or flex inward, thereby reducing the effective diameter of the elongated portion 18 and allowing the elongated portion 18 to be fully inserted into the holes 34 The resilience of the longitudinal members 20 causes the longitudinal members 20 to return to their respective states pre-actuated once the elongated portion 18 is fully inserted into the holes 32, so that the underside of the head 16 projects from the members 36. After the elongated portion 18 has been fully inserted into the holes 32, the rod 40 of the nail The drag 12 can be driven or introduced into the passage 28. As the driving claw 12 enters the body 14 from its pre-acted state, the sliding movement of the ramp 56 of the protrusions 46 relative to the ramp 60 of the slots 32, causes the legs 44 to flex towards inside and the longitudinal members 20 outwards, which allows an additional incersion of the drive pin 12. Once the drive nail 12 is inserted in the body 14 so that the flange 58 passes through the slot 32, the legs 44 achieve their maximum degree of flexion or deviation inwards.

Therefore, the additional resistance force to the incersion # to the drag nail 12 in the body 14 is limited to the frictional force between the protrusions 46 and the longitudinal members 20, until the protrusions 52 come into contact with the upper surface of the head 16 of the body 5 14. In this step, a further insertion of the drag nail 12 into the body 14 opposes or exhibits resistance by the protrusions 52. An increase in the incersion force causes the ramps 64 of the protrusions 52 deflect the walls 50 and, in this way the protrusions 52 move radially inwards until the flanges 66 pass through the outer surface of the head 16 of the body 14. The additional resistance force to the incersion of the driving pin 12 in the body 14 is reduced to the frictional force between the protrusions 46 and the protrusions 42 and the limbs longitudinal 20. The maximum force required to fully drive the drive pin 12 on the body 14 from its pre-acted stage for the plastic rivet according to the present invention, is typically less than 10 pounds. In its fully inserted position, the surface The lower surface of the head 16 of the body 14 protrudes, the protrusions 52 engage with the grooves 32 and the protrusions 46 engage with the matching surfaces 30 at a distal end 22 Of the members longitudinal 20. The engagement of the protrusions 52 with the slots 32 and the protrusions 46 with the matching surface 30 create closure of the drag nail 12 with respect to the body 14. In this way, the extraction of the dragging nail 12 of the body 14 is opposed by means of a holding force 5. The cross sections of the longitudinal members 20 and of the rod 40 of the driving claw 12 are such that a substantially solid member is formed when the driving claw 12 is fully inserted in the body 14. -f this form the longitudinal members 20 prevent collapse, and therefore oppose the removal of body 14 from members 36. It will be understood that design considerations may require a set of protrusions 46 or protrusions 52. While riveting plastic 10 in accordance With the present invention can be used to hold members 36, the body 14 can be completely molded into various designs according to what is required for the fastener.

# These designs include, but are not limited to, travel loops, brackets, hole covers, and functional covers or decorative. In this way, the various advantages and objects mentioned above are achieved more effectively. Although only one preferred embodiment of the invention is described herein, it should be understood that this invention does not is a delimited sense thereof and its scope is determined in accordance with the appended claims, "f *

Claims (8)

1. CLAIMS 1. A plastic rivet to secure two members when passing through an orifice aligned in these members, this rivet can be formed of a resilient material and comprises: a trailing nail having a head, a rod projecting from the lower surface of this head and a first closing mechanism located at a distal end of this rod; and a body having a head and an elongated portion, this elongated portion is inserted into the hole and has a plurality of longitudinal members projecting from the lower surface of this head, the longitudinal members having a radially outwardly tapered shape, from the longitudinal axis of the elongated portion, a distal end of each longitudinal member is interconnected by means of a nose, and this nose has a conical shape radially inward from the longitudinal axis, a space between the longitudinal members defining a passage, this passage being spaced through the head, each of the longitudinal members includes a first matching surface located at the proximal ends and a second matching surface located at the distal end; wherein the stem is partially inserted in a passage so that the first locking mechanisms engage with the first matching surfaces, providing a retaining force in the pulling nail which precludes this pulling finger from being removed from the handle. passage; and wherein when the drive pin is fully inserted into the passage, the first locking mechanisms engage with the second matching surface, providing a retaining force on the drive pin, which precludes this drive pin from being driven. Remove from the passage, the rod offers resistance so that these longitudinal members do not bend inwards in relation to the longitudinal axis, therefore offering resistance to the body being removed from the hole.
2. 2. The plastic rivet according to claim 1, wherein a plurality of resilient legs project longitudinally from the distal end of the rod, the first closing members comprise a protrusion projecting radially outwardly from these legs, the body having a plurality of transverse grooves defined in the first matching surface, each of these distant ends of the longitudinal members have a flange defined in the second matching surface, the legs are deflected inwardly while the driving nailing is driven in the body, Then these legs relax when the drag nail is inserted completely into the body.
3. The plastic rivet according to claim 2, having 2 diametrically opposed longitudinal members, and 2 diametrically opposed slots in which the longitudinal members, grooves, legs and protrusions are aligned along the longitudinal axis .
4. 4. The plastic rivet according to claim 1, comprises second closing mechanisms placed on the proximal end of the rod, in that when the driving pin is inserted completely in the passage and the second members of the closure engage with the first matching surfaces.
5. 5. The plastic rivet according to the claim 4 in which the rod has a transverse hole extending from the proximal end and forming a pair of walls, the second closing mechanisms comprising a protrusion projecting radially outward from each wall, each of these walls and protrusions deviating inward when the protrusions enter the passage, then these walls relax when the drag nail is inserted completely inside the body.
6. 6. The plastic rivet according to claim 3 wherein the driving finger and the body are integrally molded as one piece, the distal end of the driving finger is interconnected by means of a fragile portion with the outer surface of the head.
7. The plastic rivet according to claim 6, wherein the resilient material is nylon 6/6.
8. 8. The plastic rivet according to claim 7, further comprising clamping mechanisms integrally molded to the body. ? SUMMARY A plastic rivet that is composed of a resilient material and has a drag nail and a body. The drag nail has a head and a rod. The distal end of the rod has a pair of resilient legs, and a proximal end of the rod has a transverse hole forming deflectable walls. The first pair of protrusions projects radially outward from the legs and the second pair of protrusions projects radially outward from the legs. 10 walls. The body has a head and an elongated portion that is inserted into the holes of the members to be joined. The elongated portion comprises a pair of longitudinal members, conical outwardly, projecting from the head and interconnected by means of the nose with 15 conical shape inwards. The rod of the trailing nail is inserted into the passage which extends through the head and the elongated portion of the body. When the trailing nail is placed in a pre-incersion stage within the body, the first pair of protrusions engage in the grooves of the body. 20 passage, retaining the drag nail inside the body. The trailing nail is inserted into the body, the legs and walls are diverted inward. When the drag nail is fully inserted into the body, the first pair of protrusions engage with the matching surface 25 formed at the distal ends of the longitudinal members *, the second pair of protrusions engage with the grooves, and the rod of the drive pin and the longitudinal members form a substantially solid member. Thus, removal of the dragging finger from the body offers resistance by means of the holding force, and removal of the body from the holes of the joined members is opposed by means of a holding force.