US2341975A - Sewing machine bed - Google Patents

Description

Feb. 15, 1944. CHASON 2,341,975

SEWING MACHINE BED Filed June 8, 1942 3 Sheets-Sheet l WWW I /;WFW

Feb. 15, 1944. D. H. CHASON ,3

SEWING MACHINE BED Filed June 8, 1942 5 Sheets-Sheet 2 gnoewfot Danielli Chason Feb. 15, 1944. D. H. CHASON SEWING MACHINE BED Filed June 8, 1942 3 Sheets-Sheet 6 Daniel H Chaabn Patented Feb. 15, 1944 2,341,975 SEWING MACHINE BED Daniel H. Chason, Elizabeth, N. J., assignor to The Singer Manufacturing Company, Elizabeth, N. .L, a corporation of New Jersey Application June 8, 1942, Serial No. 446,179

8 Claims This invention relates to sewing machines and more particularly to sewing machines of the portable type and has for its primary object to produce a sewing machine which is light in weight.

Another object of the present invention is to provide such a machine with a bed which will be not only light in weight but exceedingly rigid and inexpensive to manufacture.

A further object of the invention is to provide a sewing machine bed having a. receptacle portion which may be constructed of sheet-metal, plastic .or equivalent light weight materials.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

The invention, both in structure and in opera tion, as well as additional objects thereof, will be best understood from the following description taken in conjunction with the accompanying drawings, in which:

Fig. 1 is a perspective view from the back side of a. sewing machine incorporating the present invention.

Fig. 2 is a bottom plan view of the' machine'with the bottom closure-plate removed.

Fig. 3 is a vertical section taken longitudinally through the bed portion of the machine.

Fig. 4 is a top plan view of the bed-frame.

Fig. 5 is a side elevation of the bed-frame shown in Fig. 4.

Fig. 6 is a left-hand end elevation of the bedframe shown in Fig. 5.

Fig. 7 is a right-hand end elevation of the bed frame shown in Fig. 5.

Fig. 8 is a top plan view of a portion of the machine cloth-plate at the work-feeding end thereof.

Fig. 9 is a right-hand end elevation of the machine shown in Fig. 3.

Fig. 10 is a perspective view of the cloth-plate y of the machine.

Fig. 11 is a perspective view of the platform member of the machine.

Fig. 12 is a perspective view of the right-hand end-wall shown in Fig. 3.

Fig. 13 is a perspective view of the left-hand end-wall shown in Fig. 3.

Fig. 14 is a perspective view of the bottom closure-plate shown in Fig. 3.

For the purposes of the present disclosure the invention is described as embodied in a preferred form in a sewing machine having an upright standard i5 which carries the overhanging bracket-arm l6 terminating in a hollow head ll. J ournaled for endwise movement in the head i! are the usual reciprocatory needle-bar l8 and presser-bar l9. Suitably mounted upon one end of the bracket-arm is the usual balance-wheel 20 driven from a motor 2| by a belt 22. Disposed within the standard I5 is the usual actuating mechanisin comprising the feed-actuating pitmans 23 and 24, and the rotary shaft 25 carrying the bevel gear 26 at its lower end.

For a more detailed description of the actuating mechanism disposed within the standard and the bracket-arm, reference may be had to the U. S. patent to H. J. Goosman, No. 2,063,841, dated Dec. 8, 1936.

Supporting the upright standard I5 is a chambered bed portion comprising a cloth-plate 21 having side-walls, 28 and 29 depending therefrom. End-walls 30 and 3|, having lips 32, are secured to the end portions of the cloth-plate and the side-walls by welding or suitably fastening the lips 32 to the inner portions of the cloth-plate and side-walls. The depending side- walls 28 and 29 and the depending end-walls 30 and 3| form with the cloth-plate 21 a substantially rectangular shaped receptacle or enclosure.

Tongues 33 are formed on the bottom edges of the side-and end-Walls of the cloth-plate; said tongues entering slots 34 provided in a platform member 35. Also formed on the side walls 28 and 29 are vertically apertured brackets 36, of which the apertures 31 are aligned with vertical apertures 38 provided in the platform member 35. Bolts 39 are received in these apertures, and nuts 40 are threaded on the bolts for the purpose of securing the platform member 35 to the chambered bed or receptacle portion comprising the above described cloth-plate.

In the preferred form of this bed portion, the cloth-plate and its depending walls are constructed from a thin sheet-metal, but it is obvious that it could be constructed from divers other materials including a molded plastic substance.

In order to give the bed portion the proper degree of rigidity, a substantially rectangular shaped skeletonframe member M is provided within the chambered bed portion. Upon each of the two end portions of this frame member 4| are formed bearing-elements in the form of bosses 42 which snugly enter apertures 43 provided in the respective end-walls 36 and 3|. The top portion of the frame 4| has a grid structure comprising a plurality of web-elements 44 which are engaged by the bottom surface of the clothplate 21 in a plurality of spaced areas thereof, for the purpose of supporting the same against downward deflection.

A raised and substantially circular shaped portion 45 of the frame 4| is provided with apertures 46 and is adapted to enter a raised or flanged boss 41 of the cloth-plate 21, so that the apertures 46 are vertically aligned with apertures 46 provided in the flanged. boss. The armstandard |5 is adapted to be supported directly upon the flanged boss 41 of the cloth-plate and to be secured to the raised portion 45 of the frame by means of bolts 49 which pass through the aligned apertures 46 and 46. As may be best seen in Figs. 4 and respectively, the raised frame portion 45 and the flanged cloth-plate boss 41 are apertured so that the above described rotary shaft 25 and the pitmans 23 and 24 may extend downwardly into the chambered bed.

The bevel-gear 26 is in mesh with a bevel-gear 50 carried by a loop-taker actuating shaft 5| journaled in bearing-lugs 52 which are provided on both ends of the frame 4|. As may be best seen in Fig. 2, the forward end of the looperactuating shaft 5| extends through and beyond an opening 53 provided in the end-wall 3|. A loop-taker 54 is mounted upon the forward end of the shaft 5 I. Rotation of the shaft 25, through the medium of gears 26 and 50, actuates the shaft 5| which in turn operates the loop-taker 54.

Also disposed within the chambered bed are rock- shafts 55 and 56 which impart to a feedbar 57, carrying the usual feed-dog, the conventional feed-lift and feed-advance movements. The rock- shafts 55 and 56 are supported on the pivot-pintles 58 carried by the bearing bosses 42 formed in the frame 4|. The rock- shafts 55 and 56 are actuated by the pitmans 24 and 23, respectively, the pitmans receiving their motion from the usual feed-actuating mechanisms not shown herein. For a better understanding of the looper-actuating and feeding mechanisms, reference may be had to Patent No. 2,063,841, hereinbefore mentioned.

In the forward end portion of the frame 4| is I provided a raised segmental'throat-plate supporting rib 59 disposed in the throat-plate clearance opening 60 provided in the cloth-plate 21. A slotted and suitably apertured throat-plate 6| is secured directly to the raised rib 59 by means of screws 62 which may be threaded into apertures 63 provided in the frame.

Depending from one of the grid or web members 44 is a boss 64 which is provided with a threaded aperture 65 entered by a screw 66. A sheet metal closure-plate 61. provided with an indented portion 68, is adapted to be secured to the grid-member 44 by a nut 66' threaded upon the screw 66; said screw 66 passing through an aperture 10 in said indented portion 68 and being accessible through an opening 69 in the platformmember 35. An oil-absorbent pad H is provided on the closure-plate 61 for the purpose of functioning as an oil seal and sound-absorbing means disposed between the platform member 35 and the closure-plate 61.

Projecting upwardly from the frame 4| isan arm 12 formed with a channel 13 in which is slidably disposed a rectangular shaped lug 14 provided upon the frame of the motor 2|. The

lug I4 is adjustably fixed to the arm 12 by means of a screw which extends through a vertically elongated slot 16 in the arm II and is threaded into the lug 14. From the above it will be obvious that the motor 2| may be raised or lowered upon its supp rt.

The end-wall 30 is provided with an opening 11 for receiving an electrical terminal 18, and the side-wall 29 and the cloth-plate 21 are shaped to form a recess for the reception of the motor 2|.

The throat-plate 6| overhangs a recess 19 in the end-wall 3| so as to support the work above the loop-taker 54. The end-wall 3| has apertured ears 86 to receive screws 8| which pivotally support a sheet metal extension-plate 82. As shown in Fig. 3, the extension-plate. when in its lowered position, abuts the edges of the throat-plate 6| and cloth-plate 21. Fig. 1 shows the extensionplate 82 in a partially raised position.

Having thus set forth the nature of the invention what I claim herein is:

1. In a sewing machine having sewing instru mentalities including a reciprocatory needle and a complemental loop-taker, a loop-taker shaft, work-feeding means including feed-actuating shafts, a bed comprising a cloth-plate, sideand end-walls depending from said cloth-plate and forming therewith a unitary and chambered receptable; a, closure-plate detachably disposed at the underside of said receptacle; and a rigid frame member carried within said receptacle and having bearing portions thereon, said bearin portions being secured to said end-walls, said feed-actuating shafts being mounted in said bearing portions, sa-id loop-taker shaft being carried by said frame member, and a grid carried by said frame member and engaging said cloth-plate in a plurality of spaced areas.

2. In a sewing machine having sewing instrumentalities including a reciprocatory needle and a complemental loop-taker, a loop-taker shaft, work-feeding means, including feed-actuating shafts; a bed comprising a sheet-metal clothplate, sheet-metal side and end-walls depending from said cloth-plate and forming therewith a unitary and chambered receptacle; a sheetmetal platform member to which said sideand end-walls are secured, said platform member having an opening therein; a closure-plate detachably positioned over said opening; and a unitary and rigid frame member carried entirely within said receptacle, bearing elements carried by said frame member and secured to said endwalls, said feed-actuating shafts being mounted within said bearing elements, said loop-taker shaft being carried by said frame member, and a grid carried by said frame member and engaging the lower side of said sheet-metal cloth-plate in aplurality of spaced areas.

3. In a sewing machine having sewin instrumentalities including a reciprocatory needle and a complemental loop-taker, a loop-taker shaft, work-feeding means including a feed shaft, and an electric motor to actuate said shafts; a bed comprising a cloth-plate having a plurality of openings therein, and sideand end-walls depending from said cloth-plate and forming therewith a unitary and chambered receptacle, said end-walls having a plurality of apertures therein; a closure-plate detachably positioned on the underside of said receptacle; a rigid and unitary frame member carried within said receptacle, said frame member including a plurality of bearing bosses which extend into the apertures provided in said end-walls, said bearing bosses being adapted to carry said feed shaft, a grid ele-' ment extending from said frame and engaging the bottom portion of said cloth-plate in a plurality of areas, and an arm carried by said frame and supporting said electric motor; and a throatplate secured directly to said frame and extending through one of said cloth-plate openings; said loop-taker shaft being mounted within said frame and having one of its ends extending through one of the apertures provided in one of said end-walls, said loop-taker being fixed to the end of the shaft extending beyond said endwall.

4. A sewing machine having an upright standard, a unitary bed-frame consisting of a plurality of interengaging web-elements forming a flat grid, a loop-taker shaft, work-feeding means, said loop-taker shaft and said work-feeding means being carried by and mounted within said bed-frame, a cloth-plate having wall portions depending downwardly therefrom to form a chambered receptacle, said cloth-plate being mounted upon said grid and being clamped between said standard and said bed-frame, and means provided on said bed-frame for securing the same directly to said wall portions at a plurality of spaced areas.

5. A sewing machine having a unitary bedframe consisting of a plurality of interengaging web-elements forming a flat grid, a loop-taker shaft, work-feeding means, said loop-taker shaft and said work-feeding means being carried by and mounted within said bed-frame, and a clothplate having a pair of side-walls depending downwardly therefrom, said cloth-plate being mounted upon said grid, 9, pair of unitary endwalls each being secured upon an opposite end of said bed-frame, said cloth-plate and said unitary end-walls forming a chambered receptacle containing said bed-frame, and a closure-plate detachably disposed at the under side 01' said receptacle.

6. A bed for use with a sewing machine, said bed comprising a sheet metal cloth-plate provided with downwardly depending walls forming a unitary and chambered receptacle, a unitary sheet metal platform member to which said walls are secured, said platform member having an opening therein, a closure-plate detachably positioned over the opening provided in said platform member, and a unitary skeleton frame member carried within said chambered receptacle, said skeleton frame member consisting of a plurality of interlocking webs which engage th under side of said cloth-plate and said depending walls in a plurality of spaced areas.

7. A sewing machine having an upright standard, a unitary bed-frame consisting of a plurality of interengaging web-elements forming a flat grid, a loop-taker shaft, work-feeding means, said loop-taker shaft and work-feeding means being carried by and mounted within said bedframe, a cloth-plate provided with downwardly depending walls forming a unitary and chambered receptacle, a unitary platform member to which said walls are secured, said platform member having an opening therein, a closure-plate -detachably positioned over the opening provided in said platform member, said cloth-plate being mounted upon said fiat grid and being clamped between said standard and said bed-frame so that said interengaging webs engage the under side of said cloth-plate, and means provided on said bed-frame for securing the same directly to said walls at a plurality of spaced areas.

81' A sewing machine having a unitary bedframe consisting of a plurality of interengaging web-elements forming a flat grid, a cloth-plate having a pair of opposed side-walls depending downwardly therefrom, said cloth-plate being mounted upon said grid, a pair of unitary endwalls each being secured upon an opposite end portion of said bed-frame, said cloth-plate and said end-walls forming a chambered receptacle containing said bed-frame, a closure-plate detachably disposed at the under side of said receptacle, one of said end-walls having a portion thereof apertured and inwardly offset to provide an apertured recess, a loop-taker shaft mounted within said bed-frame and having one of its ends extending outwardly through said apertured recess, and a loop-taker positioned within said sidewall recess and being fixed upon the end portion of said shaft extending beyond said end-wall.

DANIEL H. CHASON.

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