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US3815887A - Plastic spring - Google Patents

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US3815887A
US3815887A US23662172A US3815887A US 3815887 A US3815887 A US 3815887A US 23662172 A US23662172 A US 23662172A US 3815887 A US3815887 A US 3815887A
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Prior art keywords
spring
valley
axis
peaks
peak
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Expired - Lifetime
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W Curtis
D Trimble
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Hercules Inc
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Hercules Inc
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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C7/00Parts, details, or accessories of chairs or stools
    • A47C7/02Seat parts
    • A47C7/34Seat parts with springs in compression, e.g. coiled
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C23/00Spring mattresses with rigid frame or forming part of the bedstead, e.g. box springs; Divan bases; Slatted bed bases
    • A47C23/002Spring mattresses with rigid frame or forming part of the bedstead, e.g. box springs; Divan bases; Slatted bed bases with separate resilient support elements, e.g. elastomeric springs arranged in a two-dimensional matrix pattern
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47CCHAIRS; SOFAS; BEDS
    • A47C27/00Stuffed or fluid mattresses specially adapted for chairs, beds or sofas
    • A47C27/04Stuffed or fluid mattresses specially adapted for chairs, beds or sofas with spring inlays
    • A47C27/06Spring inlays
    • A47C27/065Spring inlays of special shape
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00Springs
    • F16F1/02Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/025Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant characterised by having a particular shape
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00Springs
    • F16F1/36Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/42Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by the mode of stressing
    • F16F1/422Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by the mode of stressing the stressing resulting in flexion of the spring
    • F16F1/424Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by the mode of stressing the stressing resulting in flexion of the spring of membrane-type springs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/04Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
    • F16F9/0409Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall characterised by the wall structure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2236/00Mode of stressing of basic spring or damper elements or devices incorporating such elements
    • F16F2236/02Mode of stressing of basic spring or damper elements or devices incorporating such elements the stressing resulting in flexion of the spring
    • F16F2236/022Mode of stressing of basic spring or damper elements or devices incorporating such elements the stressing resulting in flexion of the spring of membrane-type springs
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S297/00Chairs and seats
    • Y10S297/08Inflatable bellows

Abstract

A thin wall hollow, corrugated plastic spring is provided which has a plurality of annular peaks, each separated by a respective one of a plurality of annular valleys. A first group of bottoms of respective valleys are spaced a first distance from the longitudinal axis of the spring and a second group of valley bottoms, each of which alternate with a bottom of the first group, are spaced a second distance from the longitudinal axis of the spring. The peaks are arranged in the manner as the valley bottoms thereby providing a telescopic effect of the valley bottoms and a telescopic effect of the peaks when the spring is fully compressed. As modifications, all of the peaks may be at the same distance from the longitudinal axis while the distances of the valley bottoms vary as above described or vice versa. This provides for a telescoping effect of either the peaks or the valley bottoms. The spring rate is non-linear. The spring is preferably made of polypropylene and has primary utility in seating and reclining applications such as chairs, sofas, and bedding.

Description

United States Patent Curtis-ct al.

[111 3,815,887 [451 June 11,1974

[ PLASTIC SPRING [75] Inventors: William R. Curtis, Newark; David C. Trimble, Yorklyn, both of Del.

[73] Assignee: Hercules Incorporated, Wilmington,

Del.

[22] Filed: Mar. 21, 1972 [21] Appl. No.: 236,621

[52] US. Cl 267/91, 267/131, 5/351 [51] Int. Cl. Fl6g 3/08 [58] Field of Search 267/153, 181, 182,91; 5/351, 353

[56] References Cited UNITED STATES PATENTS 2,443,201 6/1948 Sluyter 267/153 3,201,111 8/1965 Afton 267/153 3,261,037 7/1966 Cermak et a1. 267/91 3,262,138 7/1966 Knittel 5/351 3,311,249 3/1967 Bell i 267/153 3,402,924 '9/1968 Rix 267/153 Primary E.raminer.lames B. Marbert Attorney, Agent, or Firm.lames W. Peterson ABSTRACT A thin wall hollow, corrugated plastic spring is provided which has a plurality of annular peaks, each separated by a respective one of a plurality of annular valleys. A first group of bottoms of respective valleys are spaced a first distance from the longitudinal axis of the spring and a second group of valley bottoms, each of which alternate with a bottom of the first group, are

spaced a second distance from the longitudinal axis of the spring. The peaks are arranged in the manner as the valley bottoms thereby providing a telescopic effect of the valley bottoms and a telescopic effect of the peaks when the spring is fully compressed. As

modifications, all of the peaks may be at the same dis- 18 Claims, 8 Drawing Figures PAIENTEBJun 1 I an SHEEI 10$ 2 FIG. I

PATENTEDJum 1914 3.815387 sum 2 or 2 H62 FIG. 4

PLASTIC SPRING In the construction of many chairs and sofas it has been customary to employ wire coil springs. The use of such coil springs and the connection thereof to a chair or sofa frame is rather expensive.

It is an object of this invention to provide a less expensive spring assembly by utilizing a specially designed plastic spring instead of a wire coil spring.

It is a further object of this invention to provide a plastic corrugated spring which possesses a non-linear spring rate.

' Yet another object of the invention is to provide a plastic corrugated spring which has a short compressed height.

Other objects of this invention will becomeapparent from the following description with reference tothe drawings wherein:

FIG. 1 is a view in section of a corrugated plastic spring;

FIG. 2 is a view' in section of the corrugated plastic spring of FIG. I fully compressed;

FIG. 3 is a partial view in section of a modification of the spring of FIG. 1;

FIG. 4 is a partialview in section of another modification of FIG. 1;

F IG. 5 is a partial view in section ofa further modification of the embodiment of FIG. 1;

FIG. 6 is a partial view in section of still another modification of FIG. 1;

FIG. 7 is a partial view in section of yet another modification of FIG. 1'; and

FIG. 8 is a partial view in section of a further modification of FIG. 1.

:Referring to FIG. 1, a spring is generally referred to by reference numeral 10, and is'supported between'a force transmitting member 11 and a support 13. The spring may either loosely rest on the support 13 or be secured thereto by an adhesive or other known means and the force transmitting member 11 may either loosely rest on the spring or be secured thereto by an adhesive or other known means. The force transmitting member 11' could represent a sofa cushion and the support 13 could represent a sofa frame. As can be seen by reference to the drawing, the spring comprises a tubular corrugated, thin-walled plastic member which has a plurality of peaks and valleys circumscribed about the longitudinal axis A-A of the spring at varying distances therefrom. Each peak 12 and 14 and each valley l6, 18 comprises a tubular wall, which is planar in cross-section and is generally parallel to the axis A-A. The side walls 20 and 22 of one valley and 24 and 26 of an adjacent valley are generally frustoconical in shape and are at an angle a with the axis of the spring which can vary between 85 and 60. The

larger diameter edges 30 of the side walls are integral with one edge of a respective peak wall and the smaller diameter edges 32 of the side walls are integral with one edge of a respective one of the bottom walls of a respective valley- As can be noted from FIG. 1, all of the bottoms 16 of the valleys are of the same radius R,, of circumscription about the. longitudinal axis A-A and all of the bottoms 18 are of the same radius r;, of circumscription about the longitudinal axis and which radius is smaller than the radius R,,. All of the peaks 14 are of the same radius R, of circumscription about the longitudinal axis A-A and all of the peaks 12 are of the same radius r of circumscription about the longitudinal axis, which radius is less than the radius R,,.

The slant width W of wall 26 is the largest followed by the slant width of walls 24, 22 and 20 in order of magnitude. Obviously, depending upon the characteristics desired, the radii of circumscription of the walls can be varied whereby the slant width W of walls 22 and 24 are equal or the slant width of wall 22 may be greater than or less than the slant width of wall 24.

When the spring is under a load F which has been applied to the force transmitting member 11, the side walls are strained as shown in FIG. 2. Upon release of the load, the stresses of the frusto-conical side walls are released and they return to their original unloaded position thereby expanding the spring-back to its un- 38 percent of the largest peak outer diameter, about 40 percent of the smallest peak outer diameter, about 52 percent of the smallest valley bottom outer diameter, and about 50 percent of the largest valley bottom outer diameter. The thickness of the parison is about 7% j times the average thickness of the spring after it is molded. Since the spring is corrugated, the longitudinal periphery is 180 percent of the original length of the parison. Thus, the spring comprises a polymer which is biaxially stretched. Due to thebiaxially stretching, the wall thickness of the spring'decreases as the diameter of the spring increases. Thus, in this particular spring design, the parison was 184 mils thick and the thickness of the valley bottom wall 18 was 43 mils, the thickness of the valley bottom wall 16 was 40 mils, the thickness of the peak wall 12 was 20 mils and the thickness of the peak wall 14 was 9 mils. This biaxial stretching effects a stronger spring and increases the fatigue life thereof.

conical wire coil spring.

The primary purpose of alternating the radii of the valley bottoms l6 and 18 and of the peaks 12 and 14 is to provide a short, fully compressed heightfor the spring since the valley bottoms and peaks can telescope within one another as shown in FIG. 2..Obviously, if all of the valley bottoms and peaks were of the same radius, the fully compressed height would be much greater since the valley bottoms would abut each other. A short, fully compressed spring is a necessity in'furniture and therefore the design is very advantageous.

The difference in radii of the bottom walls 16 and 18 should be at least equal to the thickness of the bottom wall and the difference in radii-of the peaks l2 and 14 should be at least equal to the thickness of the peak wall. The ratio of the two different radii of the valley bottoms should not exceed l /2:1 and the ratio of the two different radii of the peaks should not exceed l /z:l. The maximum peak radius should not be more than three times the minimum valley bottom radius.

The wall thickness at the valleybottom should not be greater than 18 times the thickness of the' wall thickness at the peak. r t 1 The wall thickness of the spring may be within the range of from mils to 90 mils: If the wall thickness is less than 5 mils, the springrate is too low for an effective spring-for most applications and buckling of the than the combined axial lengths of the walls of the peaks l2 and 14 whereby ifthe radii of the peaks were equal and-thev radii of the valley bottoms were equal, the valley bottom walls will abut each other while there will be space between some or all of the peaks. In this instance, the principle of this inventionmay be followed by varying only the radii of the valley bottoms as disclosed in FIG. 3 to permit telescoping of the valley bottoms to thereby-shorten the compressed-length of the spring. In other designs the combined axial lengths of the walls of the peaks l2 and 14 may be larger, than the combined axial lengths of the walls-of valley bottoms 16 and 18 whereby ifthe radii of the peaks were equal and .the radii of the valley bottoms were equal, the peak walls will abut each other .while there will be space between some or all of the valley bottoms. In this instance, the principle of this invention may be followed by varying only the radii'of the peak walls as disclosed in FIG. 4 to permit telescoping of the peak walls tent is:

to thereby shorten the compressed length of the spring.

The same elements as in FIG. 1 are designated with the same reference numerals only with an a and baffixed thereto for FIGS. 3 and'4, respectively.

The spring of any of the previous embodiment can be further modified by changing either the valley bottom wall or the peak wall, or both, to a curved or generally U-shaped wall without appreciably affecting the functional characteristics of the spring. The open ends of the curved peak or valley bottom merge with a respective side wall of the valley. These modifications are shown in FIGS. 5, 6 and 7, respectively, wherein the same elements as in FIG. 1 are designated with the same reference numerals only with a c affixed thereto for the modification of FIG. 5, with a d affixed thereto for the modification of FIG. 6, and with an .e affixed thereto for the modification of FIG. 7. The curved valley bottom walls are designated by reference numerals 200 and 202 inFIG. 5, the curved peaks are designated by reference numerals 300 and 302 in FIG. 6, the curved peaks are designated by reference numerals 304 and 306 and the curved valleys are desig-. v

nated by reference numerals 308 and3l0 in FIG. 7.

While the side walls 20, 22,24 and 26 have been described as being generally planar in cross section, they may be bowed or concavo-convex as shown in FIG. 8

wherein the same elements as shown in F IG; 1 are desv ignated with the same reference numerals only with an f affixed thereto. Each pair of side walls 402 and 404 and 406 and 408 which are connected to a common peak have their concave surfaces facing each other.

14' v The walls are slanted-in such a manner that a chord line c connecting the larger diametered edge of each wall with its respective inner diametered edge will be at an angle ,8 with the axisof tween and 60.

What we claim the spring which can vary be- I. Abiaxially stretched spring comprising a hollow,

corrugated shell having a plurality of annular peaks and second distance by at least the wall thickness of the spring at the valley bottoms, said'first valley bottoms being dimensionally greater than said second valley bottoms, a plurality of sidewalls for each valley, each said side wall being generallyfrusto-conical in shape with the smaller diametered edge thereof being integral with one edge of a respective valley bottom and the larger diametered edge thereof being integral with one edge of a respective peak, the-side walls integral with a common peak diverging from each other," the thickness of any portion of said spring shell not exceeding about mils.

2; Aspring as recited in claim 1 wherein a first group of peaks arearranged to be a third distance from the longitudinal axis of said spring, a second group of peaks are arranged to be at a fourth distance from the longitu dinal axis of said spring, said first and second'group's of said peaks being arranged that one peak of one group alternates with a peak of the other group, said third distance being greater than said fourth distance.

3. A spring as recited in claim 1 wherein all of the peaks are arranged to be equal distance from the longitudinal axis of the spring. I

I 4. A spring as recited in claim 1 wherein said side walls are slanted between 60 and85 with the longitudinal axis of the spring.

5. A spring as recited in claim 4 wherein the radius of circumscription of the peak farthest from the spring axis is no more than 3 times the radius of circumscription of the valley bottom closest to said axis, the thickness of the valley bottom wall closest to said axis is no greater than 18 times the thickness of the peak farthest from said axis.

6. A spring as recited in claim 2 wherein said side wallsare slanted between 60 and 85 with the longitudinal axis of the spring. D

7. A spring as recited in claim 6 wherein the radius of circumscriptionof the peak farthest from the spring axis is, no more than 3 times the radius of circumscription of the valley bottom closest to said axis, the thickness of the valley bottom wall closest to said axis is no and desire to" protect by Letters 'Pa- 10. A spring as recited in claim 8 wherein the side walls are generally concavo-convex in cross section, the pair of side walls connected to a common peak having the concave surfaces thereof facing each other.

11. A spring as recited in claim 8 wherein the valley bottoms and the peaks are planar in cross section and generallyparallel to the longitudinal axis of the spring.

12. A spring as recited in claim 8 wherein the valley bottoms and the peaks are U-shaped in cross section with the open ends thereof merging into a respective one of said side walls.

13. A spring as recited in claim 8 wherein the spring is made of polypropylene.

14. A biaxially stretched spring comprising a hollow, corrugated shell having a plurality of annular peaks and annular valleys separating each of said peaks, a first group of peaks being arranged to be a first distance wall being generally frusto-conical in shape with the smaller diametered edge thereof being integral with one edge of a respective valley bottom and the larger diametered edge thereof being integral with one edge of a respective peak, the side walls integral with a common peak diverging from each other, the thickness of any portion of said spring shell not exceeding about 90 mils.

15. A spring as recited in claim 14 wherein all of the bottoms of the valleys are arranged to be equal distance from the longitudinal axis of the spring.

16. A spring as recited in claim 14 wherein said side walls are slanted between 60 and with the longitudinal axis of the spring.

17. A spring as recited in claim 16 wherein the radius of circumscription of the peak farthest from the spring axis is no more than three times the radius of circumscription of the valley bottom closest-to said axis, the thickness of the valley bottom wall closest to said axis is no greater than 18 times the thickness of the peak farthest from said axis.

18. A spring as recited in claim 14 wherein the annular peaks and the annular valleys are u-shaped in crosssection with the open ends thereof merging into a respective one of said side walls.

Claims (18)

1. A biaxially stretched spring comprising a hollow, corrugated shell having a plurality of annular peaks and annular valleys separating each of said peaks, a first group of valley bottoms being arranged to be a first distance from the longitudinal axis of the spring and a second group of valley bottoms being arranged to be a second distance from the longitudinal axis of the spring, said groups of valley bottoms being arranged so that a bottom of one group alternates with a bottom of the other group, said first distance being greater than said second distance by at least the wall thickness of the spring at the valley bottoms, said first valley bottoms being dimensionally greater than said second valley bottoms, a plurality of side walls for each valley, each said side wall being generally frusto-conical in shape with the smaller diametered edge thereof being integral with one edge of a respective valley bottom and the larger diametered edge thereof being integral with one edge of a respective peak, the side walls integral with a common peak diverging from each other, the thickness of any portion of said spring shell not exceeding about 90 mils.
2. A spring as recited in claim 1 wherein a first group of peaks are arranged to be a third distance from the longitudinal axis of said spring, a second group of peaks are arranged to be at a fourth distance from the longitudinal axis of said spring, said first and second groups of said peaks being arranged that one peak of one group alternates with a peak of the other group, said third distance being greater than said fourth distance.
3. A spring as recited in claim 1 wherein all of the peaks are arranged to be equal distance from the longitudinal axis of the spring.
4. A spring as recited in claim 1 wherein said side walls are slanted between 60* and 85* with the longitudinal axis of the spring.
5. A spring as recited in claim 4 wherein the radius of circumscription of the peak farthest from the spring axis is no more than 3 times the radius of circumscription of the valley bottom closest to said axis, the thickness of the valley bottom wall closest to said axis is no greater than 18 times the thickness of the peak farthest from said axis.
6. A spring as recited in claim 2 wherein said side walls are slanted between 60* and 85* with the longitudinal axis of the spring.
7. A spring as recited in claim 6 wherein the radius of circumscription of the peak farthest from the spring axis is no more than 3 times the radius of circumscription of the valley bottom closest to said axis, the thickness of the valley bottom wall closest to said axis is no greater than 18 times the thickness of the peak farthest from said axis.
8. A spring as recited in claim 7 wherein the ratio of the different radii of circumscription of the valley bottoms is no greater than 1 1/2 :1 and the ratio of the different radii of circumscription of the peaks is no greater than 1 1/2 :1.
9. A spring as recited in claim 8 wherein the side walls are generally planar in cross section.
10. A spring as recited in claim 8 wherein the side walls are generally concavo-convex in cross section, the pair of side walls connected to a common peak having the concave surfaces thereof facing each other.
11. A spring as recited in claim 8 wherein the valley bottoms and the peaks are planar in cross section and generally parallel to the Longitudinal axis of the spring.
12. A spring as recited in claim 8 wherein the valley bottoms and the peaks are U-shaped in cross section with the open ends thereof merging into a respective one of said side walls.
13. A spring as recited in claim 8 wherein the spring is made of polypropylene.
14. A biaxially stretched spring comprising a hollow, corrugated shell having a plurality of annular peaks and annular valleys separating each of said peaks, a first group of peaks being arranged to be a first distance from the longitudinal axis of the spring and a second group of peaks being arranged to be a second distance from the longitudinal axis of the spring, said groups of peaks being arranged so that a peak of one group alternates with a peak of the other group, said first distance being greater than said second distance by at least the wall thickness of the spring at the peaks, said first peaks being dimensionally greater than said second peaks, a plurality of side walls for each valley, each said side wall being generally frusto-conical in shape with the smaller diametered edge thereof being integral with one edge of a respective valley bottom and the larger diametered edge thereof being integral with one edge of a respective peak, the side walls integral with a common peak diverging from each other, the thickness of any portion of said spring shell not exceeding about 90 mils.
15. A spring as recited in claim 14 wherein all of the bottoms of the valleys are arranged to be equal distance from the longitudinal axis of the spring.
16. A spring as recited in claim 14 wherein said side walls are slanted between 60* and 85* with the longitudinal axis of the spring.
17. A spring as recited in claim 16 wherein the radius of circumscription of the peak farthest from the spring axis is no more than three times the radius of circumscription of the valley bottom closest to said axis, the thickness of the valley bottom wall closest to said axis is no greater than 18 times the thickness of the peak farthest from said axis.
18. A spring as recited in claim 14 wherein the annular peaks and the annular valleys are u-shaped in cross-section with the open ends thereof merging into a respective one of said side walls.
US3815887A 1972-03-21 1972-03-21 Plastic spring Expired - Lifetime US3815887A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US3815887A US3815887A (en) 1972-03-21 1972-03-21 Plastic spring
CA 168257 CA967597A (en) 1972-03-21 1973-04-09 Plastic spring
GB3783073A GB1428858A (en) 1972-03-21 1973-08-09 Plastics spring
DE19737329565 DE7329565U (en) 1972-03-21 1973-08-13
DE19732340917 DE2340917A1 (en) 1972-03-21 1973-08-13 Plastic spring for armchairs or sofas
CH1188073 1973-08-17
FR7330855A FR2241723A1 (en) 1972-03-21 1973-08-20
BE134796A BE803851A (en) 1972-03-21 1973-08-21 plastics spring

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US3815887A US3815887A (en) 1972-03-21 1972-03-21 Plastic spring
CA 168257 CA967597A (en) 1972-03-21 1973-04-09 Plastic spring
GB3783073A GB1428858A (en) 1972-03-21 1973-08-09 Plastics spring
DE19732340917 DE2340917A1 (en) 1972-03-21 1973-08-13 Plastic spring for armchairs or sofas
DE19737329565 DE7329565U (en) 1972-03-21 1973-08-13
FR7330855A FR2241723A1 (en) 1972-03-21 1973-08-20
BE134796A BE803851A (en) 1972-03-21 1973-08-21 plastics spring

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US3815887A true US3815887A (en) 1974-06-11

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US3815887A Expired - Lifetime US3815887A (en) 1972-03-21 1972-03-21 Plastic spring

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US (1) US3815887A (en)
BE (1) BE803851A (en)
CA (1) CA967597A (en)
DE (2) DE2340917A1 (en)
FR (1) FR2241723A1 (en)
GB (1) GB1428858A (en)

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EP0172340A1 (en) * 1984-08-09 1986-02-26 Hüls Aktiengesellschaft Plastic energy-absorbing structural elements
US4895352A (en) * 1989-01-09 1990-01-23 Simmons Company Mattress or cushion spring array
US5098124A (en) * 1990-09-06 1992-03-24 Automotive Technologies International Inc. Padding to reduce injuries in automobile accidents
US5799987A (en) * 1995-06-05 1998-09-01 Sampson; Richard K. Fluid fitting coupling system
US6000079A (en) * 1994-07-18 1999-12-14 Dranger; Jan Elements for furniture items, furniture items including such elements and method of manufacturing of such elements
US6032890A (en) * 1996-09-23 2000-03-07 Sonoco Development, Inc. Stacking stable yarn carrier for package dyeing
US6101651A (en) * 1998-04-03 2000-08-15 Wing Hang (3Y) Industries Ltd. Pillow core
US6113082A (en) * 1997-06-27 2000-09-05 Nishikawa Sangyo Co., Ltd. Spring
US6283869B1 (en) * 1996-06-12 2001-09-04 Kwd Kupplungswerk Dresden Gmbh Toothed coupling
US20030208849A1 (en) * 1999-04-20 2003-11-13 Wilkinson John W. Inflatable cushioning device with manifold system
US20050125905A1 (en) * 1999-04-20 2005-06-16 John Wilkinson Inflatable cushioning device with manifold system
US20050273938A1 (en) * 2004-06-09 2005-12-15 The Coleman Company, Inc. Airbed utilizing extruded coils
US20060033252A1 (en) * 2004-08-13 2006-02-16 Elmoselhy Salah A M Sigma Sigma-springs for suspension systems
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USD698440S1 (en) 2011-07-29 2014-01-28 Nordson Corporation Connector for fluid tubing
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US8122545B2 (en) 1999-04-20 2012-02-28 M.P.L. Limited Inflatable cushioning device with manifold system
US7878553B2 (en) 2003-09-12 2011-02-01 Value Plastics, Inc. Releasable connection assembly for joining tubing sections
US20050273938A1 (en) * 2004-06-09 2005-12-15 The Coleman Company, Inc. Airbed utilizing extruded coils
US20060033252A1 (en) * 2004-08-13 2006-02-16 Elmoselhy Salah A M Sigma Sigma-springs for suspension systems
US7770939B2 (en) 2005-06-10 2010-08-10 Value Plastics, Inc. Female connector for releasable coupling with a male connector defining a fluid conduit
US8113546B2 (en) 2005-06-10 2012-02-14 Value Plastics, Inc. Latching female fluid tubing coupler
US7337485B2 (en) 2005-08-31 2008-03-04 The Coleman Company, Inc. Double high airbed utilizing coils
US20070044243A1 (en) * 2005-08-31 2007-03-01 The Coleman Company, Inc. Double high airbed utilizing coils
US8397756B2 (en) 2006-01-20 2013-03-19 Nordson Corporation Fluid conduit couplers with depressible latch mechanism
US7806139B2 (en) 2006-01-20 2010-10-05 Value Plastics, Inc. Fluid conduit coupling assembly having male and female couplers with integral valves
USD645547S1 (en) 2007-11-19 2011-09-20 Value Plastics, Inc. Male quick connect fitting
USD654573S1 (en) 2007-11-19 2012-02-21 Value Plastics, Inc. Female quick connect fitting
USD629894S1 (en) 2008-07-03 2010-12-28 Value Plastics, Inc. Male body of connector for fluid tubing
US8596688B2 (en) 2008-07-03 2013-12-03 Nordson Corporation Latch assembly for joining two conduits
US8448994B2 (en) 2008-07-03 2013-05-28 Nordson Corporation Latch assembly for joining two conduits
USD630320S1 (en) 2008-07-03 2011-01-04 Value Plastics, Inc. Connector for fluid tubing
USD634840S1 (en) 2008-07-03 2011-03-22 Value Plastics, Inc. Female body of connector for fluid tubing
US8235426B2 (en) 2008-07-03 2012-08-07 Nordson Corporation Latch assembly for joining two conduits
USD655393S1 (en) 2009-06-23 2012-03-06 Value Plastics, Inc. Multi-port valve
US9732891B2 (en) 2009-12-09 2017-08-15 General Electric Company Male bayonet connector
USD649240S1 (en) 2009-12-09 2011-11-22 Value Plastics, Inc. Male dual lumen bayonet connector
US9046205B2 (en) 2009-12-09 2015-06-02 Nordson Corporation Fluid connector latches with profile lead-ins
USD785790S1 (en) 2009-12-09 2017-05-02 General Electric Company Male dual lumen bayonet connector
US9464741B2 (en) 2009-12-09 2016-10-11 Nordson Corporation Button latch with integrally molded cantilever springs
US9388929B2 (en) 2009-12-09 2016-07-12 Nordson Corporation Male bayonet connector
USD650478S1 (en) 2009-12-23 2011-12-13 Value Plastics, Inc. Female dual lumen connector
CN101871497A (en) * 2010-07-01 2010-10-27 苏州纽威机床设计研究院有限公司;纽威数控装备(苏州)有限公司 Rigid spring
USD652511S1 (en) 2011-02-11 2012-01-17 Value Plastics, Inc. Female body of connector for fluid tubing
USD652510S1 (en) 2011-02-11 2012-01-17 Value Plastics, Inc. Connector for fluid tubing
USD663022S1 (en) 2011-02-11 2012-07-03 Nordson Corporation Male body of connector for fluid tubing
USD699840S1 (en) 2011-07-29 2014-02-18 Nordson Corporation Male body of connector for fluid tubing
USD699841S1 (en) 2011-07-29 2014-02-18 Nordson Corporation Female body of connector for fluid tubing
USD698440S1 (en) 2011-07-29 2014-01-28 Nordson Corporation Connector for fluid tubing
USD712537S1 (en) 2011-07-29 2014-09-02 Nordson Corporation Connector for fluid tubing
USD709612S1 (en) 2011-12-23 2014-07-22 Nordson Corporation Female dual lumen connector
US9103395B2 (en) * 2012-01-20 2015-08-11 Xilinmen Furniture Co., Ltd. Elasticity-adjustable air pressure spring
US20140042679A1 (en) * 2012-01-20 2014-02-13 Xilinmen Furniture Co., Ltd. Elasticity-adjustable air pressure spring
US20130234380A1 (en) * 2012-03-06 2013-09-12 Kia Motors Corp. Spring of suspension for vehicle
FR3041400A1 (en) * 2015-09-17 2017-03-24 Peugeot Citroen Automobiles Sa motor vehicle suspension spring

Also Published As

Publication number Publication date Type
DE2340917A1 (en) 1975-02-20 application
GB1428858A (en) 1976-03-17 application
DE7329565U (en) 1974-01-03 grant
CA967597A1 (en) grant
BE803851A (en) 1973-12-17 grant
FR2241723A1 (en) 1975-03-21 application
CA967597A (en) 1975-05-13 grant
BE803851A1 (en) grant

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