US2341898A - Ventilating device for sewing machines - Google Patents

Description

Feb. 15, 1 944. BIEN 2,341,898 VENTILATING DEVICE FOR SEWING MACHINES Filed March 29, 1943 3.5 6 UL a 9 m 5 25 I r \1 8 5: 1 9

INVENTOR. j. BJ'EN 29 BY A- 7" TOR-IVE Y Patented Feb. 15, 1944 VENTILATING DEVICE FOR SEWING MACHINES Israel Bien, San Francisco, Calif.

Application March 29, 1943, Serial No. 480,976

3 Claims.

This invention relates to a new and improved ventilating device for use in connection with sewing machines.

An object of the present invention is to provide a ventilating device that is especially constructed to be positioned onto the bed of a sewing machine and directly connected to the drive shaft thereof and to thus cause the ventilating fan to be revolved in synchronism with the operation of the sewing machine, thereby producing a cooling effect on the bearing of the machine and also providing proper ventilation for the operator.

Another object of the present invention is to provide novel means for adjusting the longitudinal center of the ventilating fans drive shaft whereby the device can be operatively connected to various types of sewing machines having different heighths and readily disconnected from the same.

Another object of the invention is to provide a meter operated by the fan shaft to record the number of stitches the sewing machine makes, by recording the revolutions of the fan shaft which is in direct driving relation to the sewing machine shaft.

Other objects and advantages will appear in the course of the following description.

In the accompanying drawing forming part of the specification and in which like numerals are employed to designate like parts throughout the same:

Fig. l is a front elevational view of the improved sewing machine ventilating device.

Fig. 2 is a central vertical longitudinal sectional view taken on line 2-2 of Fig, 1, looking in direction of the arrows, and Fig. 3 is a reduced side elevational view of the device and also shows the head portion of a sewing machine in dot and dash outline illustrating how the ventilating fan shaft is positioned in alignment with the sewing machines drive shaft and directly connected thereto.

Referring in detail to the different parts, the numeral 5 designates a cylindrica1 casing that is preferably constructed with a pair of crossbars 6 forming a central bearing support as at I and is provided with a removable wire guard 8 as shown in Figs. 1 and 2. A suitable ventilating fan 9 is positioned within the casing and is secured to the drive shaft ID as by pin 12 or otherwise, said shaft being journaled into a suitable bearing l3 that is driven into the bearing support 1. The numeral l3 designates an oil hole for enabling the bearing to be lubricated.

A collar I4 is mounted onto the outer end portion of the shaft l0 and is fixed thereto by a pin II.

The casing 5 is fixed at its lower edge onto the upper end of a pipe column l5 by preferably being welded thereto as at 16, the lower end portion of the pipe being externally threaded as at H to engage into a flanged foot l8 that is internally threaded as at IS, a set screw 20 serving to lock the two members together. A plurality of holes 2| are provided through the flanged portion of the foot to facilitate fastening the device to the bed or table 22 of the sewing machine by suitable screws 23.

The inner end portion of the shaft I0 is flattened similar to a screw driver as at 24, so that it will fit into the kerf or slot 25 of a screw 25' provided at the outermost end of the sewing machines drive shaft 26, adjacent the drive pulley 29 thus directly connecting the two shafts together. When it is desired to disconnect the shafts the sewing machine is stopped with the kerf of its screw extending horizontally, the set screw 20 is loosened and the casing 5 carrying the shaft I0 is swung on a horizontal plane to remove the flattened end of the shaft 24 from the kerf 25. The fan shaft can also be adjusted into true alignment with the sewing machines drive shaft by simply adjusting the foot member l8 before securing to the table 22. Also it may be raised or lowered somewhat by screwing or unscrewing the pipe 15 in the foot.

In Fig. 3 there is illustrated the preferred position of the ventilator with respect to the sewing machine. The numeral 25' designates the pulley retaining screw at the end of the drive shaft of the machine that extends through the head 21 and operates the needle bar 28. The numeral 29 designates the driving pulley that carries the conventiona] drive belt 39. In various types of sewing machines this pulley is fixed to the drive shaft by a screw as at 25 that extends into the end of the shaft, the head of the screw being tightened against the pulley. Though in rare cases where the slotted screw may not exist, the slot 25 can easily be provided directly into the end of the drive shaft, or, the connection of Fig. 4 may be used, as will now be described.

Fig. 4 shows a modified form of detachably connecting the fan shaft 10 to the sewing machine, and consists of providing a collar 38 slidably fitted to shaft 10 and provided with a set screw 39 for holding it in adjusted position. A soft rubber extension 40 is cemented or othertremely hot causing excessive wear. The aver-- age conventional sewing machine drive pulley 29 is constructed with a plurality of holes that extend through the sides thereof and air from the ventilating fan traveling in direction of the ar rows 3! will be forced directly onto the bearing that is provided into the head 27, serving to cool the same and a portion of the same air coming from the fan will be diverted toward the operator of the machine, thus also providing an efiicient method for producing proper ventilationin hot weather.

Means for recording the number of stitches made by the sewing machine, which is also the number of revolutions the fan makes, is shown as comprising a bracket 32 extending from the end portion of the shaft bearing body l3 and carrying a conventional revolution recording meter 33'secured to the bracket by screws 34.

The outerend portion of the meters shaft 35 is preferably flattened as at 36, and engages into a slot 31 provided into the outermost end of the fan shafts collar 35, thus keying the meter to the fan shaft in a manner similar to the construction employed for keying the fan shaft to the sewing machines shaft.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same and that various changes relative to the material, size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. A ventilator for use in combination with a sewing machine, comprising a pedestal, a ventilating fan revolubly supported thereon, said fan having a shaft with a flattened end for facilitating connection to the drive shaft of the sewing machine, and adjustable means for varying the height of the pedestal for facilitating alignment of said shafts.

2. A ventilator for use in combination with a sewing machine and adapted to be operated by the drive shaft thereof, said ventilator comprising a pedestal embodying in its construction a vertically disposed pipe column, a casing in the form of a'cylindrical shell fixed onto the upper end of said pipe column, a ventilating fan member including a shaft revolubly supported in said casing, the fan shaft extending through said casing and having a flattened end adapted to project into the conventional transversely extending slot in the screw" at the end of the sewing machines drive shaft, and a foot member adjustably se-- cured to the lower end portion of the pedestal whereby the height of the pedestal can be varied, facilitating the'connecting and aligning of said shafts.

3. A ventilator for use in combination with a sewing machine, comprising a pedestal, a ventilating fan revolvably supported thereon, said fanv having a shaft projecting in alignment with the sewing machine shaft adjacent the belt pulley thereof, the fan being directed toward the sewing machine shaft, and means forming a quick detachable direct connection from the fan shaft to the sewing machine shaft for operating said fan, including means whereby said fan and its shaft may be bodily swung on said pedestal on a vertical axis in disconnecting the shafts.

ISRAEL BIEN.

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