US2609075A

US2609075A - Power transmitter

Info

Publication number: US2609075A
Application number: US194920A
Authority: US
Inventors: Schulder Paul
Original assignee: Cons Sewing Machine & Supply C
Current assignee: Cons Sewing Machine & Supply C; Consolidated Sewing Machine & Supply Co Inc
Priority date: 1950-11-09
Filing date: 1950-11-09
Publication date: 1952-09-02
Anticipated expiration: 1969-09-02

Description

P 1952 P. VSCHULDER 2,609,075

POWER TRANSMITTER Filed Nov. 9, 1950 J T /3 I In Iz INVENTO [94w lwazazw Patented Sept. 2, 1952 owns-45mm PATENT orFrCE-fy- IPOWERTRANSMITTEF Paul Schulder, Brooklyn, N. Y., assignor to Consolidated Sewing Machine & Supply 00., Inc., New York, N. -Y., a corporation of New York 1 Application November 9,1950, Serial No. 194,920

The invention disclosed herein relatesto power transmitters for sewingmachines and the like, and is in the nature of an improvement on the transmitter disclosed in copending application Serial No. 81,643, filed March 16th, l9i9, issued as Patent No. 2,544,768, March 13th, 1951.

- Objectsof the present invention particularly are to provide a cushion mounted transmitter completely enclosed and protected against dust,

lint, threads and the like, which will be small in size and compact in character so as not to take up much space below-the table and be entirely out of the Way of the operator.

Other important objects of the invention are 'to-reduce cost of construction and simplify assembly and mounting of the unit.

- The foregoing and other desirable objects are attained by the novel features of construction, combination and relation of part as set forth in the followingspecification. 1

The drawing accompanying and forming part ofthe specification illustrates a present practical embodiment of the invention. Actual structure, however, may be modified and changed as regards the immediate illustration, all Within the true intent and scope of the invention as hereinafter defined and claimed.-- a

Fig. 1 in the drawing is a side elevation of the transmitter as mounted in operating position, with parts broken away and shown in section; Fig-2 is an end and vertical cross sectional view as taken on substantially the plane of line 2-z of Fig. 1;

Fig. 3 is an enlarged plan and broken sectional view;

Fig. 4 is a. further enlarged broken sectional .detail of the sliding shaft bearing construction as taken on substantially the planeof line 44 ofFigZ. I

As shown in Figs. 1 and 3, the transmitter comprises an electric motor I having

hubs

8, 9, at oppositeends of the same; carrying rubberor like cushions-Iii, ll, clamped in the dependent arms 12, [3,of a U-form of bracket [4 which is attached by screws or other fastenings to the under side of the table [5.

This constitutes the sole mounting means for the unit.

The motor is of relatively small diameter and is set up high between the arms of the mounting bracket so as to project only a small distance below the table and hence be entirely out of the way of the operator.

These purposes are further carried out in the illustration by having the lower arm l6 of the 2 Claims (01. 192-18) angled control lever ll lie close in substantially parallel relation'to the under side of the motor, accomplishing this partly by pivoting the upright arm l8 of the lever at i9 by short bracket arm 29 projecting substantially horizontally from the end of the lower housing and by connecting the spring 2i in a substantially horizontal relation between the upright arm of the lever, and a short bracket lug 22 projectin a slight distance below the motor housing.

The clutch andbrake mechanismis shown in Fig. 3 as made up of a driving clutch plate-23 on the motor shaft 24, and a driven clutch plate 25 engageable therewith by movementin one direction and engageable with the brake surface 2t by movement in the opposite direction.

The driven clutch plate 25 is fixed on a shaft El and this shaft, as shown more fully in Fig. 4, is grooved to form spaced, parallel ball races 28, 29, for balls 3! running in outer ball races 32, in the ends of a sleeve 34 slidable in the tubular extension 35 of the mounting hub 9.

I'he ball bearings'described are shown in Fig. 4 as including ball retainers 3B, dust excluding and lubricant sealing rings 3? and snap rings or like retainers 38.

By this combination and assembly the requirement for inner race rings is avoided and the over-all diameter of the bearings, the bearing sleeve and the hub in which the bearing sleeve slides, is kept down to a minimum without sacrifice of strength or running qualities.

The sleeve 34 is slid back and forth in the hub 35 by a stud 39 having a rounded or ball shaped inner end engaged in an opening 40 in the side of the bearing sleeve, this stud projecting through a slot M in the side of the supporting hub and being carried by the'upper end of the control lever ll.

The outer end of the driven shaft 21 carries the pulley 22 which drives the sewing machine by belt 43.

The provision of the innerball races by int'e' gral grooves in the shaft permits the use of a short, rigid, large diameter shaft without increasing over-all dimensions of the ball bearings and mounting structure.

The ball shaped housing 44 for the clutch and brake may be a completely closed, circular casting machined to fit the end of the motor frame and attached thereto by the four screws 45 shown in Fig. 2. This end housing may be integral with or formed separately from the motor end bell 46 which is shown in Fig. 1 as carrying the anchorage lug 22 for the spring 2 l The resilient cushions l and H are shown as rings of rubber or like material encased in metal rings 41 and forced over the motor end hubs, which latter are shown in Fig. 2 as ridged at 48 to effect an interlocking engagement of the cushions on the motor hubs. In practice the cushioning washers may be molded in complemental fashion to fit the ridged or ribbed end hubs of the motor structure.

The motor is shown as suspended in the arms of the mounting bracket by forming the lower ends of the arms with substantially semi-circular recesses 49, Fig. 2, to accommodate the upper halves of the metal covers 41 of the cushions,

and by notching the sides of thebracket arms at I 50 to provide appropriate shoulders over which the upper ends of the short links 5| are hooked, said links slotted at their upper ends at '52to engage over the shoulders 53, and angled at their lower ends to accommodate the clamp screws 54.

simple construction provides a firm, .secure mounting 1 for the cushions, which .can be quickly applied or .released and which, as shown in the end view, Fig. 2, does not add any bulk, since it comes within the width of the arms of the supporting bracket.

With the construction described both the overall length and the over-all diameter of the complete unit are kept to a minimum, providing compactness for shipping as well as foractual use. The simple clamp construction permits quick detachment of the motor and clutch structure from theimounting bracket, and both these clamps are fully accessible so that in'case of need the motor partof the unit may be quickly removed from the mounting bracket or, in. reverse, the motor assembly be mounted in the bracket.

The supporting of the motor assembly is effected entirely. at the outside, leaving the motor, clutch andbrake structures completely enclosed and protected.

The cushion support at the clutch end of the motor is located substantially in line with the sliding sleeve carrying the driven clutch shaft, effectin a balanced support for all the parts.

The construction as a whole is simple in design, consisting of but few, readily assembled parts which :can be produced at low cost. The close coupledrelation between the control lever,

sliding sleeve and return spring enables operationby means of a small size lever such as shown in Fig. 1, which will lie close and take up but :smalLspace .over the side and end 0f the motor housing. This. small size lever may be actuated in thecustomary manner by means of a link .55 extending from the long arm of the lever to a foot pedal or other such controlling element.

What is claimedis:

1. A power transmitter of the character dis- .closed comprising an electric motor having a shaft carrying a driving clutch element at one end of the motor, a closed clutch housing secured over said end of said motonsaid closed clutchhousing completely enclosing the end of the motor and .side arms embracing the motor and clutch housing and connected with said cushions, a. bearing sleeve slidaibly operabl in said elongated bearing,

a shaft journaled in said sleeve and carrying at the inner end a driven clutch member for cooperation with the driving clutch member and with the braking surface and at the outer end a transmission pulley and a shift lever pivotally supported on the clutch housing and having an operating connection extending through said elongatedslot at .a point adjoining the mounting cushion .on the hub of the.clutch housing, into engagement with the bearing sleeve and whereby the clutch and brake mechanism completely enclosed and supported substantially wholly between the cushioned mounting hubs and the clutch shift mechanismis immediately adjoining oneof the cushioned mounting hubs.

.2. A power transmitter of the character disclosed comprising an electric .motor having a shaft carrying'a driving clutch element, aclutch housing secured over the end of said motorand havingan elongated bearing in line with the motorshaft, said elongated bearing having a longitudinally extendedslotin theside of the same, a bearing sleeve slida-bly operablein said elongated bearing, a. shaft journaled insaidlsleeve and carrying at the inner .end a driven :clutch member for cooperation with the driving clutch member and at the outer end atransmission pulley and-a shift lever pivotally'supported on the clutch housing and having an operating connection extending through said elongated slot into engagement with the bearingsleeve, said slidable sleeve having integral .ball race groovesin the opposite ends of the same. the'shaft journaled therein having companion ball 1 race grooves spacedin line with said ballrace grooves in the sleeve and balls operating in thecompanion ball race forming grooves in the .sleeve and shaft therebyrotatably keyingsaid shaft to shift longitudinally with said sleeve.

PAULSCHULDER.

REFERENCES CITED The following references are of record inthe file of thisypatent:

UNITED STATES PATENTS Number 7 Name Date 2,037,644 Voigt ..Apr. 14, 1936 2,074,136 Welch Mar. 16, 1937 2,408,808 Pauhls et a1. Oct. 8,1946