US3630159A - Base for a portable sewing machine carrying case - Google Patents

Base for a portable sewing machine carrying case Download PDF

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Publication number
US3630159A
US3630159A US3630159DA US3630159A US 3630159 A US3630159 A US 3630159A US 3630159D A US3630159D A US 3630159DA US 3630159 A US3630159 A US 3630159A
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Prior art keywords
sewing machine
base
walls
bed
apertures
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Expired - Lifetime
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George L Zilg
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SSMC Inc
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Singer Co
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Assigned to SSMC INC., A CORP. OF DE reassignment SSMC INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SINGER COMPANY, THE
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    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B77/00Covers, or portable enclosures, for sewing machines

Abstract

A base for a sewing machine carrying case is provided. The base is an open-topped boxlike structure which supports the sewing machine and has apertures formed in at least one of the interior walls thereof for reducing the noise produced by operation of the sewing machine.

Description

United States Patent References Cited UNITED STATES PATENTS 8/1964 Momberg et [72] Inventor George L. Zilg Dunellen,N.J. [21] AppLNo. 30,857

[22] Filed Apr. 22, 1970 [45] Patented Dec. 28, 1971 [73] Assignee FOREIGN PATENTS 12/1960 France......................

Primary Examiner-Patrick D. Lawson The Singer Company New York, N.Y.

Assistant Examiner-George H. Krizmanich Alrorneys-Marshall J. Breen, Chester A. Williams, Jr. and

Robert E. Smith [54] BASE FOR A PORTABLE SEWING MACHINE CARRYING CASE 5 Claims, 2 Drawing Figs.

ABSTRACT: A base for a sewing machine carrying case is provided. The base is an open-topped boxlike structure which supports the sewing machine and has apertures formed in at least one of the interior walls thereof for reducing the noise produced by operation of the sewing machine.

[51] Int.Cl............ [50] Field of PATENTED nttzs I971 INVENTOR. George L. Zllg ATTORNEY WITNESS:

440k MODM BASE FOR A PORTABLE SEWING MACHINE CARRYING CASE BACKGROUND OF THE INVENTION Portable sewing machines have in the past been provided with carrying cases which are often formed of molded plastic material. Such carrying cases have a cover which encloses the sewing machine and an open-topped boxlike base which supports the sewing machine and which encloses the bed of the sewing machine in the cavity defined by the walls of the base. The simple boxlike structure of the base has proved to be quite sturdy and convenient for supporting the sewing machine and housing the bed thereof. However, as a result of the boxlike structure, such bases have been found to have a tendency to act as a sound box for the noise created by the operation of the sewing machine, and, thereby to amplify the noise to an undesirable level. The noise is often further amplified when the sewing machine is operated on a table top.

SUMMARY OF THE INVENTlON This invention provides an improved base for a sewing machine carrying case which incorporates means for attenuating and dissipating the noise of the sewing machine operation.

The sewing machine carrying case base of the invention comprises an open-topped boxlike body adapted to support a sewing machine and having side, end, and bottom walls together defining a space within which the bed portion of the sewing machine can be accommodated, at least one of said walls having at least one aperture therein adapted to attenuate and dissipate the noise created by the operation of the sewing machine supported on the base.

The sewing machine carrying case of the type contemplated herein is composed of a cover and base such as shown in US. Pat. application Ser. No. 822,457, G. Zilg and H. Milan, filed May 7, 1969. Both the cover and the base are preferably molded from high-impact polystyrene, but the carrying case can be made from other materials, if desired.

The base is generally an open-topped box having bottom, side and end walls. The base supports the sewing machine and the walls define a space which accommodates the bed portion of the sewing machine. The side and end walls of the base preferably are formed in a dual wall construction in which a pair of parallel, spaced walls are provided. This can be easily done by forming the side and end walls in an inverted U-shape such that one of the legs of the U" define the upstanding interior side and end walls and another of the legs of the U provide depending exterior plates. lt is also possible to form the end and sidewalls of the base in a single rather than in a dual wall construction. A dual wall construction is preferred however, since it is possible to provide superior noise reduction with a dual wall construction as will be more particularly described hereinafter. In addition, the exterior wall or plate in a dual wall construction can shield the apertures in the inner wall from sight, thereby improving the appearance of the base.

At least one of the walls is provided with at least one aperture which reduces the noise level created when the sewing machine on the base is operated. The apertures permit the sound waves generated by operation of the mechanism in the sewing machine bed to escape from the base and thereby prevents these waves from resonating within the base. Moreover, the apertures prevent the walls of the base from resonantly vibrating in the manner of sounding boards and prevent the entire base from acting as a sound box. This inhibits the base from amplifying and reflecting sound waves, whether generated within or exteriorly of the base.

Where a dual wall construction is employed, the exterior walls or plates act as sonic baffles which reflect and attenuate the sound impinging on them. Moreover, by appropriate spacing of the two walls, the exterior walls can reflect the sound such that the reflected sound waves are out of phase with the oncoming sound waves so as to product cancellation of much of the sound. The spacing is determined by the principal frequency and/or wavelength of the sound and can be calculated from known acoustic equations.

Apertures need not be provided in all of the walls. In fact, one apertured wall is sufficient to produce a reduced noise level, although best results are obtained if all of the walls are apertured. The apertures can take the form of slits, slots, square, circular, or elliptical openings or the like. The shape of the apertures is not critical to the invention herein nor is the number of apertures provided. However, it has been found that when the open area defined by apertures comprises approximately 40 percent of the wall area a particularly significant noise reduction is achieved.

The apertures formed in the sidewall can also conveniently serve additional functions, acting, for example, as providing clearance for a hinge of the sewing machine or as mounting locations for a portion of the sewing machine bed. If desired, the interior of the base can be lined with an acoustically absorbing material to further reduce the noise generated by operation of the sewing machine.

Preferred embodiments of the invention are shown in the drawings in which:

FIG. 1 is an end view partially in cross section of a carrying case incorporating the base of the invention.

FIG. 2 is a view in perspective and partially in cross section of a base in accordance with the invention.

The portable sewing machine and carrying case assembly shown in FIG. 1 comprises a sewing machine 5 mounted on a base 10 of a carrying case assembly 15. The carrying case assembly is made of high-impact polystyrene and includes a cover 11 detachably mounted on the base 10. The cover can be secured to the base 10 by means of latches (not shown). One suitable latch construction is shown in U.S. Pat. No. 3,050,899. The cover 11 has a top wall 14 having a recess 17 in which a handle 16 is mounted. The handle 16 is also of conventional construction. A suitable handle is shown in US. Pat. No. 3,340,970. The cover has sidewalls 18 which enclose the sewing machine and extend to the walls of the base 10 so as to engage the sidewalls of the base 10 in a sliding fit.

The base 10 supports the sewing machine 5 and also encloses the bed 6 of the sewing machine. A portion of the sewing machine mechanism 19 within the bed is shown in broken lines in FIG. 1. The sewing machine bed 6 is closed by a bottom cover 7, and is preferably formed with cushioned depending feet 8. The base 10 is formed with a bottom wall 20 joined by interior sidewalls 22 and interior end walls 24 which together define a cavity 25 for accommodating the sewing machine bed 6. The side and end walls 22 and 24 are formed with flat upper portions 26 and 27 respectively and the cavity 25 may be bordered by a marginal recess 28 shaped to fit the sewing machine bed.

Depending from the flat upper portions 26 and 27 are exterior plate portions 30 and 31 which form inverted U-shaped dual walls with the interior sidewalls 22 and end walls 24 respectively.

The structure of the walls of the base can best be seen by reference to FIG. 2. The dual end wall 24, 31 is of similar construction to the dual sidewalls 22, 30 with the exception that the upper portion 27 of this wall is of substantially greater width than the upper portion 26 of the sidewalls and'an additional support wall 32 may be provided intermediate the in terior end wall 24 and the exterior plate 31.

The interior sidewalls 22 and the end walls 24 are formed with slots 35. These slots extend from adjacent the upper portion 26 and 27 for a distance which is less than the height of the exterior skirts 30 and 31 so that they are not visible from the outside of the base. The slots reduce the noise level by permitting the sound waves to escape from the base and by preventing the walls from resonating as sounding boards and thereby preventing the base from acting as a sound box. The exterior plates 30, 31 act as baffles to deflect and attenuate the sound waves thereby also reducing the noise level. The apertures 35 are rectangular. An additional aperture 39 is provided which is troughlike in structure. This aperture provides clearance for accommodation of a hinge structure (not shown) of the sewing machine.

As shown in the drawings, the bottom wall 20 of the base is provided with apertures 40 through which the cushioned feet 8 of the sewing machine can protrude. The bottom wall 20 is also formed with recessed boss 41 providing for a fastening screw 42 which threads into the sewing machine bottom cover 7 to secure the carrying case base to the sewing machine. This arrangement provides for a space between the bottom of the base 10 and the level of any supporting table top or the like (not shown). Although not illustrated in the accompanying drawings, the bottom wall of the base may, therefore, also be made of dual wall construction and apertured for egress of sound in the same manner as the side and end walls. Other embodiments of the invention will be apparent to those skilled in the art.

Having set forth the nature of this invention, what is claimed herein is:

1. A noise-reducing base for a carrying case for a portable sewing machine, comprising an open-topped boxlike body adapted to support a sewing machine, body walls formed on the sides, ends, and bottom of said boxlike body which body walls together define a cavity within which the bed portion of the sewing machine can be accommodated, said body being formed with a flat upper portion bordering said cavity and an external plate depending from said flat upper portion in spaced substantially parallel relation opposite to a portion of at least one of said walls of said body, said body wall being formed with an aperture opening interiorly onto said sewing machine bed portion accommodating cavity, and opening externally into the space between said body wall and said plate.

2. A base for a carrying case for a portable sewing machine,

in accordance with claim 1 in which said body wall is formed with a plurality of apertures each opening interiorly into said sewing machine bed portion accommodating cavity and externally into the space between said wall and said plate.

3. A base for a carrying case for a portable sewing machine, in accordance with claim 1 in which said external plate is provided opposite to portions of said body walls both on the sides and ends of said body, and in which said body walls on both the sides and ends of said body are formed with apertures opening interiorly onto said sewing machine bed portion accommodating cavity, and opening externally into the space between said wall and said plate.

4. A base for a sewing machine carrying case, comprising a generally rectangular open-topped boxlike plastic body adapted to support a sewing machine thereon and having upstanding side and end walls and a bottom wall, the side, end, and bottom walls together defining a cavity in which the bed portion of a sewing machine can be accommodated, at least one upstanding wall being composed of an interior wall and an exterior wall spaced in parallel relation with the interior wall and terminating in a bottom free edge, the interior wall of said parallel walls having apertures therein for reducing the noise created by operation of a sewing machine on the base, the exterior wall of said parallel walls extending laterally opposite said interior wall apertures to shield said apertures from view.

5. A portable sewing machine assembly comprising a base in accordance with claim 4, a sewing machine mounted on the base with the bed portion in the cavity, and a cover enclosing the sewing machine and detachably mounted on the base.

Claims (5)

1. A noise-reducing base for a carrying case for a portable sewing machine, comprising an open-topped boxlike body adapted to support a sewing machine, body walls formed on the sides, ends, and bottom of said boxlike body which body walls together define a cavity within which the bed portion of the sewing machine can be accommodated, said body being formed with a flat upper portion bordering said cavity and an external plate depending from said flat upper portion in spaced substantially parallel relation opposite to a portion of at least one of said walls of said body, said body wall being formed with an aperture opening interiorly onto said sewing machine bed portion accommodating cavity, and opening externally into the space between said body wall and said plate.
2. A base for a carrying case for a portable sewing machine, in accordance with claim 1 in which said body wall is formed with a plurality of apertures each opening interiorly into said sewing machine bed portion accommodating cavity and externally into the space between said wall and said plate.
3. A base for a carrying case for a portable sewing machine, in accordance with claim 1 in which said external plate is provided opposite to portions of said body walls both on the sides and ends of said body, and in which said body walls on both the sides and ends of said body are formed with apertures opening interiorly onto said sewing machine bed portion accommodating cavity, and opening externally into the space between said wall and said plate.
4. A base for a sewing machine carrying case, comprising a generally rectangular open-topped boxlike plastic body adapted to support a sewing machine thereon and having upstanding side and end walls and a bottom wall, the side, end, and bottom walls together defining a cavity in which the bed portion of a sewing machine can be accommodated, at least one upstanding wall being composed of an interior wall and an exterior wall spaced in parallel relation with the interior wall and terminating in a bottom free edge, the interior wall of said parallel walls having apertures therein for reducing the noise created by operation of a sewing machine on the base, the exterior wall of said parallel walls extending laterally opposite said interior wall apertures to shield said apertures from view.
5. A portable sewing machine assembly comprising a base in accordance with claim 4, a sewing machine mounted on the base with the bed portion in the cavity, and a cover enclosing the sewing machine and detachably mounted on the base.
US3630159D 1970-04-22 1970-04-22 Base for a portable sewing machine carrying case Expired - Lifetime US3630159A (en)

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US3085770A true 1970-04-22 1970-04-22

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US3630159A true US3630159A (en) 1971-12-28

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US (1) US3630159A (en)
BR (1) BR7102264D0 (en)
DE (1) DE2115079A1 (en)
FR (1) FR2089927A5 (en)
GB (1) GB1289800A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2221945A6 (en) * 1973-03-14 1974-10-11 Manufrance Sewing machine case - of flaps supported by contoured base
US4037549A (en) * 1974-09-10 1977-07-26 Janome Sewing Machine Co. Case for portable sewing machines
US4509442A (en) * 1983-05-16 1985-04-09 Marvel Specialty Company Acoustical shield assembly for a sewing machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1252967A (en) * 1960-03-24 1961-02-03 Singer Mfg Co Sewing machine case
US3145675A (en) * 1961-05-18 1964-08-25 Singer Co Sewing machine and carrying case with electrical adapter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1252967A (en) * 1960-03-24 1961-02-03 Singer Mfg Co Sewing machine case
US3145675A (en) * 1961-05-18 1964-08-25 Singer Co Sewing machine and carrying case with electrical adapter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2221945A6 (en) * 1973-03-14 1974-10-11 Manufrance Sewing machine case - of flaps supported by contoured base
US4037549A (en) * 1974-09-10 1977-07-26 Janome Sewing Machine Co. Case for portable sewing machines
US4509442A (en) * 1983-05-16 1985-04-09 Marvel Specialty Company Acoustical shield assembly for a sewing machine

Also Published As

Publication number Publication date
FR2089927A5 (en) 1972-01-07
BR7102264D0 (en) 1973-04-10
GB1289800A (en) 1972-09-20
DE2115079A1 (en) 1971-11-18

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Date Code Title Description
AS Assignment

Owner name: SSMC INC., A CORP. OF DE, CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SINGER COMPANY, THE;REEL/FRAME:005041/0077

Effective date: 19881202