US2987021A

US2987021A - Housing assembly for sewing machines

Info

Publication number: US2987021A
Application number: US821526A
Authority: US
Inventors: Meier Gunther
Original assignee: Gritzner Kayser AG
Current assignee: Gritzner Kayser AG
Priority date: 1959-06-19
Filing date: 1959-06-19
Publication date: 1961-06-06
Anticipated expiration: 1978-06-06

Description

June 6, 1961 G. MEIER HOUSING ASSEMBLY FOR SEWING MACHINES 2 Sheets-Sheet 1 Filed June 1 1959 Gin/her ME/ER June 6, 1961 s. MEIER HOUSING ASSEMBLY FOR SEWING MACHINES 2 Sheets-Sheet 2 Filed June 19, 1959 INVE/VTOI? GJn/bel MEIER United States Patent Filed June 19, '1959, Ser. No. 821,526 Claims. (Cl. 112-258) This invention relates to the assembly of a housing structure employable for accommodating therein the drive and actuating mechanisms of a sewing machine.

It is one of the primary objects of this invention to provide means facilitating economical and rapid assembly of a sewing machine and in particular its housing parts in a continuous operation as required for series and mass productions.

It is another object of the present invention to provide means insuring the engagement of the housing parts of the sewing machine in such a manner that the noise of the mechanism will be substantially eliminated and the housing of the machine may be made of lightweight material so that the transportation of the parts of the sewing machine casing to the location of assembly may be greatly facilitated.

It is still another object of the present invention to provide means envisioning an efi'icacious tight seal between the engaging or abutting edges of the housing parts so that dust and other foreign matter may be kept out of the machine housing, while dampening of the vibrations of the housing parts during machine operation will be simultaneously reduced to a minimum.

Yet a further object of the present invention is to provide means rendering the possibility of easily centering and aligning engageable parts of the sewing machine housing with respect to each other, so that the same can be handled and manipulated even by unskilled labor at greatly reduced cost and without the requirement of any machining operations.

These and other objects of the invention will become further apparent from the following detailed description, reference being made to the accompanying drawings showing a prefered embodiment of the invention.

In the drawings:

FIG. 1 shows in an exploded view the parts of a housing of a sewing machine prior to their assembly.

FIG. 2 shows a view similar to FIG. 1 of the housing seen in perspective and in assembled condition.

The housing of a sewing machine is generally made from light-weight metal which is manufactured by dieor pressure-casting.

In such cases it becomes also necessary that access or openings are provided which are closed later on during assembly work by a cover. Generally the cover is also made by die-casting which contributes to a relatively high cost of production of such housings.

In order to reduce the manufacturing cost, it was heretofore proposed to produce the top cover and a lateral closure of the housing as a single and integral part. When such closure cover is fixed in position on the hollow arin of a sewing machine, there 'have been observed in the closure cover stresses which sometimes, if the cover is equipped with a carrying handle, exceed in admissible values of strength.

The present invention does away with these and other disadvantages and achieves an efiicacious construction of a cover with handle attachment which eliminates completely any stresses or strains acting on the machine cover.

In accordance with the invention, two abutment or bearing blocks are provided having surfaces for engaging the'cover which carries on its upper surface recesses arranged for accommodating the carrierhandle, while all Patented June 6, 1961 other parts are kept in assembled position by means of screws passing through threaded bores in the aforesaid surfaces of the bearing blocks.

A particular advantage of this novel construction is that the connection between the housing and its cover may leave a gap or cleft, whereby it will not be required that the engaging edges of the parts be subjected to any machining or shaping operations which entails considerable cost reduction and simplification in such manufacture. The aforesaid gap formation may, however, be readily tight-sealed by an intermediate layer of rubber or other suitable yieldable material. The tightening or sealing material contributes then simultaneously to the dampening of noises often caused by running mechanisms and parts of the sewing machine.

Referring now in particular to FIGS. 1 and 2 of the drawings, there is disclosed a housing 1 for a sewing machine having a base plate 2, an upright standard 3 and a substantially hollow arm 4 terminating in a head 5. This frame-shaped housing is open at the top at 6 and at the rear of the arm 4 at 7 and further at the front end at 22. This open frame 30 receives the usual drive mechanism including a drive shaft (not shown) which extends through the bearings 9, 10 of the

bearing blocks

9a and 10a. On top of these bearing blocks are arranged abutment extensions 11 and 12 provided with threaded

bores

20 and 21 for a purpose later described. The open frame 30, namely the open standard 3, the horizontal arm 4 and head 5 are closed by a closeure cover 8 which is so placed on the open frame 30 that the side edges 8a of the cover come to lie for abutment against

upper end edges

4a and 3a respectively, of frame housing 30, whereby bores 18 and 19 provided in cover 8 register with threaded

bores

20 and 21 of the bearing blocks 9a and 101: respectively. Cover 8 is substantially U-shaped in cross section and has on its top surface a large recess 31 and two

elongated recesses

14, 15 through which bores 18 and 1 extend. The elongated slots or

recesses

14, 15 are spaced from recess 31 and terminate in open ends at walls 8b and respectively.

When cover 8 is brought into engagement with frame 30 at its

edges

3a, 4a it is preferred to place on the latter a rubber strip or similar sealing material in order to close the cover tightly on frame 30. Positioned in

recesses

14 and 15 and extending across recess 31 is a handle 13 shaped to fit with its projections 13a,

13b recesses

14 and 15. Handle 13 is further provided with.

two spaced apart bores 17 through which may be inserted screw bolts 16 which in turn extend through bores 18 and 19 for engagement with the threaded

bores

20 and 21 of the

bearing blocks

9a, 10a.

The surface of handle 13 is provided with a longitudinal groove 25 in which may be fitted a cover strip 26 made from metal or similar material, which in turn may be fastened to handle grip 13 by means of screws 27. Thus the heads of screw bolts 16 may be well covered and are not readily accessible from the outside of the machine frame.

From FIG. 2 it will become apparent that when handle grip 13 is fastened in place the median part of handle 13 bridges recess 31, which is wide enough between walls 8b and 80 to accommodate the hand of an operator for carrying the machine frame.

The front end 8d of cover 8 and the corresponding end edge 23a of front cover 23 may be so conformed and constructed that front cover 23 may be hinged (by the.

engagement of hook 23b with opening 230) at the front edge 8d in any appropriate manner so that front cover closing the opening 22 other suitable fastener 3 through opening 24a of front cover 23 for engagement with threaded bore 24b provided in end edge a of frame 30.

The width of handle 13 and of its projections 13a, 13b.

is such that the same fit the elongated slots or recesses 14, and abut the respective bottoms 8e of the

respective recesses

14, 15. The median part of handle 13 may have substantially any suitable configuration. In the present instance the cover strip 26 overlying the heads of screw bolts 16 extends beyond the outermost ends of handle 13 and thus fixes already handle 13 in its desired position in

recesses

14, 15.

The

edges

3a, 4a, 5a on the one hand defining the standard, the horizontal arm and the head do not need any machining and also the corresponding edges 8a of cover 8 do not have to be shaped or machined, as a rubber or like strip material when inserted between the aforesaid edges will be sufiicient to tightly seal the interior of the housing against the admission of dust particles and the like and simultaneously contributeto dampening the noise of the machine mechanism. It is further to be noted that the machine housing frame and/or its cover embodying the invention may be made not only from light-weight metal but also from any other suitable resinous material or composition thereof which affords sufi'lcient strength and withstands stresses generally emanating from multicam control mechanisms. Assembly and disassembly of the sewing machine housing parts may be readily had and the set-in handle 13 contributes to the strengthening of the cover and does not disturb the streamlined appearance of the assembled housing.

It can thus be seen that there has been provided in adcordance with the invention a sewing machine housing assembly comprising a hollow frame having edges defin= ing a hollow standard, a horizontal arm and head, a cover therefor terminating in edges conformed to corresponding edges of said frame for engagement therewith,

at least two bearing blocks recessed in said horizontal arm and provided with abutment faces, said cover havrespective aligned holes for registry with threaded bores provided in said abutment faces, fastening means inserted through said holes of said projections and of said elongated recesses to and aflixing said handle grip in position on said cover and the latter in edge to edge abutment position with saidframe, said handle grip being provided with an elongated groove extending substantially over the entire top surface of said handle grip, and means overing a top surface provided with two aligned elongated recesses each with a bottom surface and a central cavity separating said recesses, a handle grip provided with projections fitting said bottom surfaces of said elongated recesses and bridging said central cavity, said projections and said elongated recesses being provided with respective aligned holes for registry with threaded bores provided in said abutment faces, whereby fastening means may be inserted through said holes of said projections and of said elongated recesses to afiix said handle grip in position on said cover and the latter in edge to edge abutment position with said frame, said handle grip being provided with an elongated groove extending over the entire top surface of said handle grip, and means overlyingsaid holes and said fastening means and anchored in said elongated groove.

Various changes and modifications may be made without departing from the spirit and scope of the present invention and it is intended that such obvious changes and modifications be embraced by the annexed claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. A sewing machine housing assembly comprising a hollow frame having edges defining a hollow standard, a horizontal arm and head, a cover therefor terminating in edges conformed to corresponding. edges of said frame for engagement therewith, at least two spaced apart and parallel bearing blocks recessed in said horizontal arm and provided with abutment faces, said cover having a top' surface provided with two aligned elongated recesses each with a bottom surface and a central cavity separating said recesses, a handle grip provided with projections abutting said bottom surfaces of said elongated recesses and bridging said central cavity, said projections and'said bottom surfaces of said elongated-recesses heing'provided witlf lying said holes and said fastening means and anchored in said elongated groove. v

2. A sewing machine housing assembly comprising a hollow frame terminating in edges defining a hollow standard,-an elongated horizontal arm and head, a cover therefor having corresponding edges for engaging said edges of said frame, two hearing blocks supported in and extending transversely of said horizontal arm and provived with upright abutment projections, said cover being provided on the top surface thereof with two aligned spaced apart elongated recesses, each having a bottom surface and a central cavity between said recesses, a handle grip provided withprojections fitting said elongated recesses and bridging said central cavity, said projections and said bottom surfaces of said elongated recesses being provided with aligned holes for registry with threaded bores provided in said abutment projections,- and fastening means inserted through said holes of said projections of said handle grip and of said bottom surfaces of said elongated recesses to aflix said handle grip in position in said cover, said cover being in edge to edge engagement with said frame.

3. An assembly according to claim 2, said elongated recesses of said cover extending in lengthwise direction of the latter, said cavity being oriented in crosswise direction to said recesses.

4. An assembly according to claim 2, wherein said handle grip is provided with an elongated groove extend ing beyond said holes, a cover strip located in said groove, and means for holding in place said cover strip and overlying said fastening means.

5. In a sewing machine having a hollow, elongated arm frame defined by walls, a cover fitted on said arm frame walls and an elongated handle engaged on said cover; two bearing blocks mounted in spaced apart resubstantially transversely and parallel to each other thereacross, thereby to prop the Walls of said frame, engageable means mounted on top of said bearing blocks, said frame cover being provided with a top surface having spaced apart, elongated recesses each provided with a bottom surface, a depression located in said top surface and bet-ween said elongated recesses and directed transversely thereto, said handle having a middle section overlying said depression and two end sections abutting said bottom surfaces in said recesses and provided with perforations, the bottom surfaces of said'recesses being provided with bores in' registry with said perforations and said engageable means, fastening means extending from said bottom surfaces through said perforations and said bores and anchored in said engage-able means, said handle having a longitudinal groove extending into the top surface of said handle, and'strip r neans fitted in said groove and extending. substantially-flush with said' top surface.

said strip means abuttingsaid fastening means in said bottom surfaces, thereby to contact said fastemngmeans 2,407,763 Northetal Sept. 17, 194'6 2,45s;754 Wallace Jan. 11, 1949 2,678,011 Peers" a a1. l May 11 1954 2,724,355 Heimann' Nov. 22, 1955