Patent Grant
7784159
This invention relates to spring fasteners characterized by a structure having a cavity in which an extension or rib of a first part, such as a plastic panel for example, may be engaged, and they are also suitable to be engaged reversibly in a slot of second part, such as a metal sheet or the frame of a car for example. The invention also pertains an assembly of the first and the second part as connected to each other through the fastener, as well as vehicles comprising such assemblies.
A number of fasteners have been used in the past for securing one object on another object, as for example, securing an article such as for example a plastic sheet on a metal or other rigid plastic sheet. However, the fasteners of the type, which are improved by the advances of the present invention, and being used presently, have a rather low ratio of insertion force to removal force. In other words, they require considerable force to be inserted into a slot in order to provide adequate removal resistance in order to be removed from the slot. This is ergonomically inferior performance, and the operators may suffer miscellaneous ailments, while productivity is also considerably undermined.
Examples of conventional fasteners are disclosed in U.S. Pat. No. 5,987,714 (Smith); U.S. Pat. No. 5,887,319 (Smith); U.S. Pat. No. 5,542,158 (Gronau et al.); U.S. Pat. No. 5,422,789 (Fisher et al.), U.S. Pat. No. 5,373,611 (Murata); U.S. Pat. No. 5,314,280 (Gagliardi); U.S. Pat. No. 5,095,592 (Doerfling); U.S. Pat. No. 4,792,475 (Bien); U.S. Pat. No. 4,683,622 (Ohelke); U.S. Pat. No. 4,609,170 (Schnabl); U.S. Pat. No. 4,245,652 (Kelly et al.); U.S. Pat. No. 3,864,789 (Leitner); U.S. Pat. No. 3,673,643 (Kindell); U.S. Pat. No. 3,525,129 (Holton); U.S. Pat. No. 2,825,948 (Parkin); U.S. Pat. No. 2,607,971 (Bedford, Jr.); U.S. Pat. No. 2,542,883 (Tinnerman); U.S. Pat. No. 2,329,688 (Bedford, Jr.); U.S. Pat. No. 2,322,656 (Murphy), among others.
U.S. Pat. No. 5,919,019 (Fisher) provides fasteners which can only be permanently installed into a slot; they can only be inserted but not extracted without damage to parts of the fastener. The major engagement is performed by spring strips, while frictional portions of the fastener pass through the slot with at most slight compression, and immediately after the insertion of the fastener they are located in slightly spaced or barely contacting relation with the edges of the slot. They are only activated for engagement after the insertion of a bolt into a hole at the base plate. Thus, the profound effect of the increased removal to insertion ratio (explained in detail hereinbelow) is not recognized, mentioned, or implied. Thus, the intentionally provided distance of the frictional portions away from the edges of the slot by Fisher, during insertion and before use of the bolt, teaches actually away from the instant invention, which recognizes and takes full advantage of the increased removal to insertion ratio by an engagement region having a hindrance portion. As a matter of fact, if the engagement surfaces of the instant invention were located in slightly spaced or barely contacting relation with the edges of the slot, no engagement at all would take place upon insertion of the fastener of this invention into the slot.
U.S. Pat. No. 6,141,837 (Wisniewski) describes a spring fastener comprising bulbous and outwardly projecting portions, which assist in preventing withdrawal of the clip and associated molding from an aperture of a vehicle frame. However, “bulbous projections” are necessarily voluminous, take most of the space between the “reverse bents”, and unless they are manufactured within tight tolerances with regard to the thickness of the frame, the “base plates” do not sit on the frame (see also the Figures), rendering the structure unstable.
U.S. Pat. Nos. 6,203,240 B1 (Hironaka et al.), 5,129,768 (Hoyle et al.), 5,092,550 (Bettini), 4,981,310 (Belissaire), 4,712,341 (Harris, Jr. et al.), 4,595,325 (Moran et al.), 4,431,355 (Junemann), 4,133,246 (Small), and 2,424,757 (F. Klump, Jr.) are directed to plastic or metal fasteners which are designed to be just inserted into the slot of a panel, but not extracted without damage to the fastener (if such extraction would be attempted from the front side; the side from which the fastener is inserted into the panel, since the back part of the panel is not reachable in the cases, wherein such types of fasteners are used).
As aforementioned, this invention relates to spring fasteners characterized by a structure having a cavity in which the rib of a first part, such as a plastic panel for example, may be engaged, and they are also suitable to be engaged reversibly in a slot of second part, such as a metal sheet or the frame of a car for example. The invention also pertains an assembly of the first and the second part as connected to each other through the fastener, as well as vehicles comprising such assemblies.
More particularly, the invention pertains a spring fastener comprising a first side and a second side opposite the first side, the first side connected to the second side thereby forming a U-shaped structure having a cavity between the first side and the second side, a bottom portion wherein the first side and the second side are connected, and a top portion, the first side comprising first barbs having first front ends, and a first engagement spring, the first engagement spring connected to the first side in the vicinity of the bottom portion, the second side comprising second barbs second front ends, and a second engagement spring, the second engagement spring connected to the second side in the vicinity of the bottom portion, each of the first and second engagement springs having an optional recess and a free end in the vicinity of the top portion, each spring also comprising a peak and an engagement region with a hindrance portion between the optional recess, or the free end if the recess is absent, and the peak, the hindrance portion providing increased removal force, when the fastener is pulled by a rib of a first part engaged to the first and second barbs, after the fastener has been inserted into a slot of a second part, the slot having a slot width and edges on which edges the engagement region is engaged, the increased removal force being due to the hindrance portion, and wherein the fastener can be extracted when pulled by the rib without damage to said fastener.
This invention further pertains an assembly comprising:
In addition, this invention is related to a vehicle which comprises an assembly, the assembly comprising:
According to this invention, and particularly for ergonomic purposes combined with practical aspects, it is highly preferable that the force to insert the rib of the first part into the cavity of the spring fastener should be less than 40 lbs, preferably less than 15 lbs, and even more preferably less that 10 lbs; the force to insert the spring fastener into the slot should be less that 30 lbs, preferably less than 15 lbs, and even more preferably less than 10 lbs; and the force to extract the spring fastener from the slot should be in the range of 30-100 lbs, and preferably in the range of 50-70 lbs.
To achieve the above results, in a preferred embodiment of this invention, the hindrance portion comprises one structure selected from ripple, side rib, upward solid bent extension parallel to the peak and the optional recess (or the free end in the absence of the recess), knurled region, bent teeth, each having a depth, and a combination thereof.
It is preferable that the depth of the ripple, the side rib, the upward solid bent extension which is parallel to the peak, the knurled region, and the bent teeth is smaller than 0.2 mm.
It is further preferable that each ripple is in the form of a depression, the depression having a deepest part, a front side, a back side and a width, and the hindrance portion has a surface, comprises not more than three ripples, and wherein the depth of each ripple is the distance between the surface of the hindrance portion and the deepest part of the respective ripple.
It is more preferable that the hindrance portion comprises not more than two ripples, and even more preferable one ripple.
For better performance, the ripple width is larger than the depth of the ripple, and preferably the ripple width is at least twice the size of the depth of the ripple.
The ripple width is preferably in the range of 0.1 to 0.5 mm and the ripple depth is in the range of 0.01 to 0.1 mm.
In a preferred embodiment, the back side of the ripple has a slope in the range of 15 to 30 degrees with regard to the general plane of the hindrance portion, and it is also preferable that the front side has a higher slope than the back side.
In the case that the hindrance portion comprises a single ripple, it is highly preferable that the ripple has only a back side, and substantially lacks a front side. It is also highly preferable that the back side has the form of a curvature with a gradually decreasing slope. For example, the gradually decreasing slope may have the shape of an arc in the range of 50-70 degrees with a radius in the range of 0.03-0.05 mm.
The barbs are preferably selected from a group consisting essentially of:
It is preferable that the barbs are cut from their respective side, are flexible, and bent in the vicinity of their respective front end as described for example in U.S. Pat. No. 6,279,207 B1, which is incorporated herein by reference, and more particularly in
The barbs are considered to be flexible if they do not cause the width W3 (
Regarding the outside outer barbs, it is preferable that their front points are at a distance from the second side smaller than the thickness of the material from which the spring fastener was made. This is to avoid interconnection of the fasteners, when said fasteners are stored in bulk.
The barbs may have variable width along their length, or they may have substantially the same width along their length. Further, the front points of the barbs may be toothed.
It is also preferable that the fastener has a width in the vicinity of the top portion of the fastener which is at least 60%, and more preferably at least 70%, as wide as the slot width.
With respect to the engagement region it is preferable that it is at least partially wider than the rest of the engagement spring.
The spring fasteners of the instant invention may have two engagement springs at the edges of each side instead of one engagement spring in substantially the middle portion of each side.
The spring fastener may further comprise additional lower barbs pointing inwardly and originating form the vicinity of the bottom portions of the first side and the second side of the fastener. In another embodiment, each side of the spring fastener has only one upper barb and one lower barb, the upper barb of one side facing the lower barb of the other side and vice versa. In still another embodiment, the fastener may further comprise a relief opening in the vicinity of the bottom of the spring fastener.
The spring fastener of the instant invention may further comprise a molded elastic body under the top portion of said spring fastener. Such arrangements are disclosed in U.S. Pat. No. 6,353,981 B1, which is incorporated herein by reference.
In another embodiment, the spring fastener of the instant invention may further comprise:
According to the present invention, any embodiments of fasteners described above and their equivalents may be used in any assembly in which the first part and the second part are connected with the fastener, as well as in any vehicle comprising such an assembly or such a fastener or its equivalents.
The reader's understanding of practical implementation of preferred embodiments of the invention will be enhanced by reference to the following detailed description taken in conjunction with perusal of the drawing figures, wherein:
As aforementioned, this invention relates to spring fasteners characterized by a structure having a cavity in which the rib of a first part, such as a plastic panel for example, may be engaged, and they are also suitable to be engaged reversibly in a slot of second part, such as a metal sheet or the frame of a car for example. The invention also pertains an assembly of the first and the second part as connected to each other through the fastener, as well as vehicles comprising such assemblies.
More particularly, as better shown in
In all cases, numerals referring to the first side 12 contain the letter “a”, while numerals referring the second side 14 contain the letter “b”. The same numerals without the letters “a” or “b”, refer collectively to the respective elements of both sides.
The first side 12 comprises first barbs 36a, which in this case are outer barbs, since they are disposed in an outer portion of the first side 12. The barbs 36a have first front ends 38a. In this particular case the first barbs 36a are bent inwardly in the vicinity of the front ends 38a, as it will be explained in more detail at a later point.
The first side 12 also comprises a first engagement spring 20a, which is connected to the first side 12 in the vicinity of the bottom portion 16.
The second side 14 comprises second barbs 36b, which in this case are inner barbs, since they are disposed in an inner portion of the second side 14. The second barbs have second front ends 38b. In this particular case the first barbs 36b are also bent inwardly in the vicinity of the front ends 38b, as it will be explained in more detail at a later point.
The second side 14 comprises a second engagement spring 20b, which is connected to the second side 14, also in the vicinity of the bottom portion.
Each of the first and second engagement springs 20a and 20b have a first and second optional recess, 24a and 24b, respectively, and a first and second free end, 22a and 22b, respectively, in the vicinity of the top portion 18 (18a and 18b, respectively). Each spring also comprises a first and a second peak, 26a and 26b, respectively, and a first and second engagement region, 28a and 28b, respectively, with a first and second hindrance portion, 29a and 29b, respectively, between the optional recesses 24 and the peaks 26.
The hindrance portions providing increased removal force, when the fastener 10 is pulled by a rib or extension 46 (
This invention further pertains an assembly 11, as better shown in
In addition, this invention is related to a vehicle which comprises an assembly 11, as described above.
In operation of the above embodiments, the spring fastener 10 of the present invention is intended to connect a first part, such as a panel 44 for example, which panel may have a rib 46, with a second part, such as a frame 48 of a car for example, having a slot 50, as illustrated in
The rib 46 of the panel 44 is preferably first inserted into the cavity 19 of the fastener 10 (see
In this manner, the first part, exemplified by panel 44, has been connected on the second part, exemplified by frame 48, through the fastener 10 of the instant invention.
In most practical applications, the length Le (see
According to this invention, and particularly for ergonomic purposes combined with practical aspects, it is highly preferable that the force to insert the rib of the first part into the cavity of the spring fastener should be less than 40 lbs, preferably less than 15 lbs, and even more preferably less that 10 lbs; the force to insert the spring fastener into the slot should be less that 30 lbs, preferably less than 15 lbs, and even more preferably less than 10 lbs; and the force to extract the spring fastener from the slot should be in the range of 30-100 lbs, and preferably in the range of 50-70 lbs.
It was unexpectedly found by the inventors that in order to achieve the above results, the hindrance portions should comprise rather minute elements, and not the huge structural components disclosed in the art. Such huge structural components render respective fasteners to be irreversibly inserted into slots. Any attempt to extract these fasteners from the side of the panel that they were inserted would result in destruction of the fasteners.
According to this invention, the hindrance portions 29a and 29b may comprise minute elements, such as ripples, upward solid bent extensions parallel to the peaks and the optional recesses (or free ends in the absence of recesses), knurled regions, bent teeth, each having a depth, the depth of which does not exceed preferably 0.2 mm, and more preferably 0.1 mm. Any person of ordinary skill in the art would not expect that elements having such minute depths would have such great impact in force balances as the aforementioned ones.
The depth for any element is substantially defined in the same manner as defined at a later point for the ripples.
Although this invention includes any structure which satisfies the claims, such as for example upward solid bent extensions parallel to the peaks and the optional recesses (or free ends in the absence of recesses), knurled regions, bent teeth, as described in at least one of the provisional patent applications 60/301,364, filed Jun. 25, 2001, 60/327,815, filed Oct. 9, 2001, and 60/353,515, filed Feb. 1, 2002, all of which are incorporated herein by reference, and as long as their depth does not exceed 0.2 mm, the most preferable configuration is one that comprises at most three ripples having a preferable depth not exceeding 0.2 mm, and more preferably not exceeding 0.1 mm. It is more preferable that the hindrance portion comprises not more than two ripples, and even more preferable one ripple. Structures with one to three two-sided ripples 30 are shown in
The most efficient and effective case, however, according to this invention, is the use of only one single-sided ripple 30, as shown for example in
The operation of these embodiments is substantially the same as the operation of the previous embodiments.
It is preferable that each ripple 30 is in the form of a depression, as better shown in
For better performance, the ripple width is larger than the depth of the ripple, and preferably the ripple width is at least twice the size of the depth of the ripple. The ripple width is preferably in the range of 0.1 to 0.5 mm and the ripple depth is in the range of 0.01 to 0.1 mm, as aforementioned.
In a preferred embodiment, the back side 34 of the ripple 30 is substantially linear and has a slope S in the range of 15 to 30 degrees with regard to the general plane of the surface E of the hindrance portion 29, and it is also preferable that the front side 32 has a higher slope than the back side. The slope of the front side is measured in the same manner as the slope of the back side. Thus, if the front side 32 is substantially perpendicular to the surface E, the slope is substantially 0 degrees, while if the front side 32 is substantially parallel to the plane of surface E and the continuation of the deepest part Z, it is substantially 90 degrees.
It is, however, highly preferable that the back side 34 has the form of a curvature with a gradually decreasing slope. For example, the gradually decreasing slope of back side 34 may have the shape of an arc corresponding to an angle A1, preferably in the range of 50-70 degrees, with a radius R, preferably in the range of 0.03-0.05 mm., as better shown in
This configuration is of extreme importance in most occasions, because during vibrations, the edges 51 of the slot 50 (
The barbs are preferably selected from a group consisting essentially of:
In operation, the barbs engage on the rib 46 of the first part 44, and when an adequate pulling force is applied on the firs part 44, the fastener remains on said first part 44, but is extracted from the slot 50.
The spring fastener 10 may also comprise relief openings 42a and 42b in the vicinity of the bottom 16 of the spring fastener 10, as better shown in
The spring fastener 10 may further comprise additional lower barbs 40a and 40b pointing inwardly and originating form the vicinity of the bottom portion 16 of the first side and the second side, respectively, of the fastener 10, as better shown in
In another embodiment, better illustrated in
The barbs 36 may have variable width along their length, as illustrated in for example in
Regarding outside outer barbs 36, it is preferable that their front points 38 are at a distance C from the second side 14 smaller than the thickness T of the material from which the spring fastener 10 is made, as better shown in
It is preferable that the barbs are cut from their respective side, are flexible, and bent in the vicinity of their respective front end as described for example in U.S. Pat. No. 6,279,207 B1, which is incorporated herein by reference, and more particularly in
It is also preferable that the fastener 10 has a width W3 (
With respect to the engagement regions 28, it is preferable that these regions are at least partially wider than the rest of the respective engagement springs 20 (see for example
The more barbs are present, or the more bent their front points are, the stronger the engagement of the rib 46 in the cavity 19. However, in many occasions it is desirable that this engagement is not so strong so as to destroy the integrity of the fastener or the rib, when an adequate force is applied to separate the fastener 10 from the rib 46.
The spring fasteners 10 of the instant invention may have two engagement springs 20 at the edges of each side instead of one engagement spring 20 in substantially the middle portion of each side (see for Example
The spring fastener 10 of the instant invention may further comprise a molded elastic body 54 at least under the top portion 18 of said spring fastener 10, as better shown in
The operation of this embodiment is similar to the operation of the previously described embodiments with the difference that the elastic body provides moderate sealing properties to the fastener when the fastener is inserted into the slot.
In another embodiment, the spring fastener of the instant invention may further comprise:
The presence of lips 60 improves considerably the sealing properties of the elastic body.
Such arrangements are also disclosed in U.S. Pat. No. 6,381,811 B2, which is incorporated herein by reference.
The operation of this embodiment is similar to the operation of the previously described embodiments with the difference that the combination of the elastic body 54 with the casing 58 provide outstanding sealing properties to the fastener 10 when the fastener 10 is inserted into the slot 50, and the casing itself facilitates the insertion of the fastener 10 into the slot 50.
According to the present invention, any embodiments of fasteners described above and their equivalents may be used in any assembly in which the first part and the second part are connected with the fastener, as well as in any vehicle comprising such an assembly or such a fastener or its equivalents.
It should also be understood that the miscellaneous embodiments and features of the instant invention may be used in any combination or by themselves in other articles or devices, where they may be needed.
Examples of embodiments demonstrating the operation of the instant invention, have been given for illustration purposes only, and should not be construed as restricting the scope or limits of this invention in any way.
This application is a continuation in part of non-provisional application Ser. No. 10/164,963, filed Jun. 7, 2002, now U.S. Pat. No. 6,718,599, which is incorporated herein by reference in its entirety.
| Number | Name | Date | Kind |
|---|---|---|---|
| 2322656 | Murphy | Jun 1943 | A |
| 2329688 | Bedford, Jr. | Sep 1943 | A |
| 2424757 | Klumpp | Jul 1947 | A |
| 2542883 | Tinnerman | Feb 1951 | A |
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| Number | Date | Country |
|---|---|---|
| 496700 | Oct 1953 | CA |
| 2255094 | May 1973 | DE |
| Number | Date | Country | |
|---|---|---|---|
| 20040083582 A1 | May 2004 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 10164963 | Jun 2002 | US |
| Child | 10692828 | US |
