US3750201A - Bottom bed structure - Google Patents

Abstract

A bottom bed structure includes a rectangular bottom bed frame having supported thereon a plurality of coil springs and a plurality of beam members having pressed out portions forming protruding resilient lip portions. A pair of oppositely positioned lip portions receives the lowest spring coil turn and fixedly secures the coil turn in the spacing formed between the lower surfaces of a pair of oppositely positioned protruding resilient lip portions and the upper surface of the beam member. The resilient lip portions make frictional contact with the lowest spring coil turn.

Description

D United States Patent 1191 1111 3,750,201

Usami Aug. 7, 1973 1 BOTTOM BED STRUCTURE 3,091,450 5/1963 Reed 267/86 2,773,271 12/1956 Wetzler.... [76] Inventor Ikegamh 3,623,171 11 1971 Arkin 5 351 Ohtaku, Tokyo, Japan [22] Filed: Sept. 8, 1971 Primary Examiner-Casmir A. Nunberg N0: Att0rney0tt0 John Munz [30] Foreign Application Priority Data {57] ABSTRACT Sept. 8, 1970 Japan 45/89714 A bottom bed Structure ihhludes a rectangular bottom May 25, 1971 Japan; 46/41993 bed frame having Supported thereon a plurality of Aug. 5, 1971 Japan 46/70006 Springs and a plurality of beam members having pressed out portions forming protruding resilient lip 52 us. (:1 5/263, 5/248, 5/310 portiohs- A p of pp y Positioned p Portions 51 Int. Cl. A47 23/04 receives the lowest Spring coil turn and fixedly Secures 5s 1 Field of Search 297/456; 5/234, 248, the mm in the Spacing formed between the lower 5/263 351 353 310; 2 7 30 86, 92, 2 surfaces of a pair of oppositely positioned protruding resilient lip portions and the upper surface of the beam [56] References Ci member. The resilient lip portions make frictional con- UNITED STATES PATENTS tact with the lowest spring coil turn.

2,832,966 511958 Frey; 5/248 3 Claims, 7 Drawing Figures PATENIEUAus 1 ms SHEET 1 BF 2 INVENTOR NOBUO USAMI BY W A ORNEY Hummus H915 3.750.201

sum 2 or 2 IN VENTOR NOBUO USAMI BY W A ORNEY DETAILED DESCRIPTIONOF THE INVENTION This invention relates to a bottom bed structure having an improvedmounting structure for fixedly securing coil springs to beam members.

A known bottom bed structure has wooden beam members on which a plurality of coil springs are supported in position. Each of the coil springs is generally fitted to the corresponding beam member by means of a wire penetrating through the wall of the beam member. On the top surfaces of the coil springs a cushioning layer and cover .sheet are disposed to constitute a bottom bed structure.

Such an'operation offitting coil'springs to the beam member, however, requires performing complicated work and thus-resulting in an increase in cost.

An object of this invention is to'provide an improved bottom bed structure which is capable of overcoming the problem of the known bottom bed structure mentioned above.-According to this invention, a plurality of beam members are used, each of which is-supported on transverse members thatare disposed across the opposite side members of a bottom bed'frame and has a plurality of pressed out protruding resilient lip portions, Each lip portion is formed integrally with the beam member and has a lower surface disposed above the upper surface of the beam member. The spacings "formed between the lower surface of the lipportions and the upper surface of'the beam member provides an enclosurefor-the lowest turnportion of an individual coil spring. The resilient lip'portion ispressed downwardly to make frictional contact against the lowest turn portion of the coil spring, thereby the coil spring issecurely'fitted .to the beam member.

Another object of this invention is to provide a bottom bed structure in which the lowestturn portion of an individual coilspring is securely held in the spacings formed between the .upper surfaces of a beammember i'andthe lower surface of azprotruding lip portions formed integrallytherewith. I

A'further object of thisinvention is to provide a bottom bed structure which'is .easily assembled by simple operations as compared with the known manufacturing of bottom bed structures,'with the result thatthe production rate'of-speed is increased-and, the cost is decreased.

In the accompanying drawings:

FIG. I is axplan view of a bottombed structure according to this invention;

FIG. 2 is asectional view along the line I] ll of FIG. 1; I

FIG. 3 is a partialxperspective view of the structure F IG. 6 is an enlarged perspective view showing a part ofa beam member and a coilspring used in thestructure shown in FIG. and

FIGL7 is aexploded perspective view showing a part of a reinforcingmember and leg member.

PREFERRED EMBODIMENTS OF THE INVENTION Referring nowto the accompanying drawings, particularly to FIGS. 1 to 3, reference numeral v1 denotes a rectangular bottom bed frame which is made of a light weight metal material and comprises a plurality of transverse members or plates 2 in a predetermined spaced parallel relationship to each other. On each of the plates 2 a plurality of beam members 3 are arranged in a spaced relationship as in extend to a direction parallel to the longer side of the frame 1 and are secured to the plates 2 by suitable fitting means. Preferably, each of the members 3 has a pair of flanges 4 on opposite sides thereof. Bolts or studs 5 secure the beam members 3 to the plates 2.

Each beam member 3 has a top wall 3' and a series of lip portions 6 and 7 which are formed integrally by punching or pressing out a part of the top wall. Each lip portion forms a hollow channel or spacing 8 or 9 having a triangular cross section (FIG. 4).

The lip portions 6 and 7 are spaced from each other by a distance equal to that of the diameter of the lowest turn 10' of a coil spring 10 which is to be fitted to the beam member 3. Each of the coil springs 10 is fitted to the beam member 3by inserting the lowest turn 10' of the spring 10 through the respective spacings 8 and 9 that are formed between the lower surfaces of the lip portions 6 and 7 and the upper surface of the beam member '3.

After being fitted to the beam member 3, the'coil springs 10 are connected to each other at the top portion by means of S.C.C. springs 11 and wire springs l2, and then covered with a cushioning layer and covering sheet (not shown). To each of the corners of the lower surface of the bed frame 1 leg members 13 aresecured.

FIGS. Sand 6 illustrate a bottom bedstrlucture according toanother embodiment of this invention in which a plurality of lip portions 14 formed in thebeam member 3 having spacings 15 of rectangular. cross section. The-spacings l5 serve as an enclosure for the lowest turn 10' of the coil spring 10. The lip portion is depressed downwardly to securely establish frictional contact with and hold the spring between the lower surfaces of the lip portions and the upper surface 3" of the beam member 3.

Theleg members 13 may be fitted to thelowersurface of the bed frame 1. Alternatively, as shown in FIG. 7, each leg member 13 maybe constructed-to have a threaded portion '16 which is screwed-into a threaded hole 17 which is'formed'in a reinforcing member 18.

The member 18 maybe fitted on the lowersurface of theplate 2 by means of suitable fitting studs.

What is claimed is:

1. A bottom bedstructure comprisingin combination:

a rectangular bottom bed frame;

a plurality of transverse members supported in a spaced parallel relationship to each other on said rectangular frame and being perpendicularly positioned to the length of said rectangular frame;

a plurality of beam members mounted on said transverse members and arranged parallel to the=length of said rectangular frame; and

a plurality of coil springs, each of which includes a turn portion on the lowest part of the spring coil;

downwardly to make frictional contact with said lowest spring coil turn.

2. A bottom bed structure as claimed in claim 1 wherein each of said spacings has a rectangular cross section.

3. A bottom bed structure as claimed in claim 1 wherein each of said pair of oppositely positioned lip portions is spaced from each other by a distance equal to that of the diameter of said lowest spring coil turn. l l I I

Claims (3)

1. A bottom bed structure comprising in combination: a rectangular bottom bed frame; a plurality of transverse members supported in a spaced parallel relationship to each other on said rectangular frame and being perpendicularly positioned to the length of said rectangular frame; a plurality of beam members mounted on said transverse members and arranged parallel to the length of said rectangular frame; and a plurality of coil springs, each of which includes a turn portion on the lowest part of the spring coil; each of said beam members having a top wall member, said top wall member having a series of pressed out portions forming pairs of oppositely positioned protruding resilient lip portions, each pair of oppositely positioned lip portions receiving the lowest spring coil turn and fixedly securing said coil turn in spacings formed between the lower surfaces of each said pair of protruding lip portions and the upper surface of said beam member; each said pair of resilient lip portions being pressed downwardly to make frictional contact with said lowest spring coil turn.

2. A bottom bed structure as claimed in claim 1 wherein each of said spacings has a rectangular cross section.

3. A bottom bed stRucture as claimed in claim 1 wherein each of said pair of oppositely positioned lip portions is spaced from each other by a distance equal to that of the diameter of said lowest spring coil turn.

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