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Publication numberUS3606072 A
Publication typeGrant
Publication dateSep 20, 1971
Filing dateJul 25, 1969
Priority dateAug 8, 1968
Also published asDE6929780U
Publication numberUS 3606072 A, US 3606072A, US-A-3606072, US3606072 A, US3606072A
InventorsPinchin Thomas William
Original AssigneeWillmotts Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Boxes,cases and the like
US 3606072 A
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Description  (OCR text may contain errors)

P 1971 r. w. PINCHIN BGXES, CASES AND THE LIKE Filed July 25, 1969 IIIIIIIIIII--- I I- m m w M I I I 0 m0 United States Patent 3,606,072 BOXES, CASES AND THE LIKE Thomas William Pinchin, Evesham, Worcester, England, assignor to Willmotts Limited, Evesham, Worcester, England Filed July 25, 1969, Ser. No. 844,941 Claims priority, application Great Britain, Aug. 8, 1968, 37,855/ 68 Int. Cl. B65d 43/16 US. Cl. 220-315 3 Claims ABSTRACT OF THE DISCLOSURE A box includes a body portion and a lid formed integrally with the body portion as a one-piece moulding of a synthetic plastics material. The lid is connected to the body portion by a web extending between side walls of the body portion and lid which are co-planar when the lid is closed. The side walls provide means for attachment of a spring clip which biases the lid into either a fully open position or a fully closed position.

BACKGROUND OF THE INVENTION Field of the invention This invention relates to boxes, cases and the like (hereinafter referred to generically as boxes) which include a body portion, a lid hingedly connected to the body portion and spring means acting between the body portion and the lid and operative to urge the lid into an open position when the lid is moved relative to the body portion beyond a predetermined partially open position and to urge the lid into a closed position when the lid is in a position between said predetermined partially open position and the closed position.

Description of the prior art In previous forms of boxes having the constructional features set out above either the lid of the box or the wall of the body portion to which the lid is hinged has been formed of, or has included a part formed of, a resiliently deformable synthetic plastics material shaped so as to provide the necessary spring opening and spring closing action. In such previous boxes the lid and the body portion have been formed as separate mouldings of a synthetic plastics material so that the separate parts of the box have had to be assembled together after moulding thereof.

It is an object of the present invention to provide an improved form of box wherein the lid and body portion are formed as a one-piece moulding.

SUMMARY OF THE INVENTION The lid is formed integrally with the body portion as a one-piece moulding of a synthetic plastics material, the hinge means between the body portion and the lid is constituted by a web interconnecting the lid and body portion, the web extends between a generally planar upwardly extending side wall of the body portion and a generally planar downwardly extending side wall of the lid and the side walls are formed to afford means for attachment of the spring means, the side walls being disposed in co-planar relationship when the lid is closed.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a sectional view of the box shown with the lid thereof in its closed position, the section of FIG. 1 being taken parallel to the hinge axis and in a direction towards said hinge,

FIG. 2 is a sectional view of the box taken at right 3,606,072 Patented Sept. 20, 1971 ice plane passing through the hinge as indicated by the arrows 3-3 in FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT The box 10 is formed by injection moulding from a synthetic plastics material and has a hinged lid 11 which includes a top portion having generally planar downwardly depending side walls 12 and the lid 11 is connected to the body 13 of the box by a hinge 16. The body 13 has a flat base 14 and upwardly extending generally planar side walls 15, the hinge 16 between the lid 11 and the body 13 being constituted by a flexible connecting web which extends between adjacent side Walls of the lid and body.

A slot 18 is formed in the side wall 15 of the body 13 of the box adjacent the hinge 16, said slot 18 being arranged with its open mouth facing towards the hinge and the slot 18 being located on the inner face of the side wall 15. A slot 19* is formed in the side wall 12 of the lid 11 adjacent the hinge, the slot 19 again being disposed with its open mouth facing towards the hinge 16 and the slot 19 being disposed on the innerface of the wall 12. The lid 11 and the body 13 of the box 10 are of the same configuration, being of generally rectangular form in the particular construction shown, so that the box is symmetrical about a plane containing the hinge. It will, however, be appreciated that many alterations can be made in the particular configuration of the box and that the lid and body can, if required, be of different configurations.

A spring steel wire 26 which has end portions 28 which are bent at an angle to the main portion 30 of the wire 26, is inserted in each slot 18, 19 formed in the box side walls 12 and 15 with the inclined end portions 28 thereof pointed towards the opening at the top of the associated slot 18 or 19. A spring clip 32 of C-section is held in position by engagement of hook portions 34 at each end of the clip with the main or central portions 30 of the two wires 26. The steel Wires 26 are held securely in their slots 18, 19 as any pressure in a direction such as to efiect withdrawal thereof will cause the end portions 28 of the wires to become embedded in the end walls 36 of the slots 18 and 19. An opening 38 is formed in the centre of the side wall 40 (see FIG. 3) of each slot 18 or 19 for the hook portions 34 of the spring clip 32 to engage the main or central portions of each wire 26.

The spring clip 32 provides an over-dead-centre.snap action for opening or closing the lid and is in a condition of maximum tension when the lid is moved into a predetermined partially open position, which position is detetrmined by the configuration of the spring clip. The spring clip 32 provides both snap opening and snap closing of the lid away from this partially open position.

As the hinge 16 connecting the lid 11 and the body 13 of the box 10 is formed integral with the lid and body as a web interconnecting them, the box can be for-med as a one-piece moulding and the only operations required in assembling the box are the insertion of the wires 26 and the connection of the spring clip 32 to the two wires 26.

I claim:

1. In a box including a body portion, a lid hingedly connected to the body portion and spring means acting between the body portion and the lid and operative to urge the lid into an open position when the lid is moved relative to the body portion beyond a predetermined partially open position and to urge the lid into a closed position when the lid is in a position between said pre-determined partially open position and the closed position, the improvement wherein:

(a) the lid is formed integrally with the body portion as a one-piece moulding of a synthetic plastics material,

(b) the hinge means between the body portion and the lid is constituted by a web interconnecting the lid and body portion,

(c) the body portion includes a generally planar upwardly extending side wall and the lid includes a generally planar downwardly extending side wall which is disposed in co-planar relationship with the said side wall of the body portion when the lid is closed,

((1) said web extends between said side walls,

(e) said side walls are formed to afford means for attachment of said spring means,

(f) said side walls are formed in their inner surfaces with slots which have open mouths facing towards the hinge means,

(g) locating elements for the spring means are received in said slots, and

(h) each locating element is a spring steel wire which extends generally parallel to the hinge axis and has its end portions bent in the direction towards the open mouth of its associated slot whereby any tendency to withdraw it from its slot by the application of a force to its central or intermediate portion will result in the end portion thereof becoming embedded in the end walls of the associated slot.

2. In a box including a body portion, a lid hingedly connected to the body portion and spring means acting between the body portion and the lid and operative to urge the lid into an open position when the lid is moved r relative to the body portion beyond a pre-deterrnined partially open position and to urge the lid into a closed position when the lid is in a position between said pro-determined partially open position and the closed position, the improvement wherein:

(a) the lid is formed integrally with the body portion as a one-piece moulding of a synthetic plastics material,

(b) the hinge means between the body portion and the lid is constituted b a web interconnecting the lid and body portion,

(c) the body portion includes a generally planar upwardly extending side wall and the lid includes a generally planar downwardly extending side wall which is disposed in co-planar relationship with the said side wall of the body portion when the lid is closed,

(d) said web extending between said side walls,

(c) said side walls are formed to aiford means for attachment of the spring means,

(f) said side walls are formed in their inner surfaces with slots which have open mouths facin towards the hinge means,

(g) locating elements for the spring means are received in said slots, and

(h) said locating elements are elastically deformable.

3. A box according to claim 2 wherein each elasticallydeformable locating element is in the form of a spring steel wire which includes a main portion extending generally parallel to the hinge axis and end portions bent towards the open mouth of the associated slot, wherein the ends proper of each spring steel wire engage walls of the associated slot, wherein said spring means is of C-section and wherein free ends of the spring means engage one with the main portion of each spring steel wire.

References Cited UNITED STATES PATENTS 3,317,078 5/1967 Gordon 22035 3,416,655 12/1968 Shilfman 206 FOREIGN PATENTS 1,482,054 4/1967 France 20631 JOSEPH R. LECLAIR, Primary Examiner J. R. GARRETT, Assistant Examiner U.S. Cl. X.R. 220-35

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4289234 *Jun 16, 1980Sep 15, 1981Rutschke Roger MCigarette package closure
US4452373 *Jun 15, 1982Jun 5, 1984Packaging By Forming Industries, Inc.Jewelry box hinge structure
US6126642 *Oct 2, 1998Oct 3, 2000Science IncorporatedPatient controlled fluid delivery device
Classifications
U.S. Classification220/829
International ClassificationE05F1/00, E05F1/10
Cooperative ClassificationE05F1/1083
European ClassificationE05F1/10E