US1338825A - Starting-switch for motors - Google Patents

Description

H. J. L. AND L. H. FRANK.

STARTING SWITCH FOR MOTORS. APPLICATION'FILEDSEET. I8, 1916 RENEWED MAR. 24, 1920.

abtouuqs IAGUL HT/ON H. J.,,L. AND L. H. FRANK.

STARTING SWITCH FOR MOTORS. APPLICATION FILED SEPT. 18. 1916 RENEWED MAR. 24, 1920.

Patented May 4, 1920.

2 SHEETSSHEET 2- I 7 Lean 1251 112721 Wag-S 712672 essay UNITED STATES PATENT OFFICE.

HARRY J. L. FRANK AND LEON FRANK, OF DETROIT, MICHIGAN, ASSIGNORS TO MUTUAL ELECTRIC &; MACHINE COMPANY, OF DETROIT, MICHIGAN, A ORPORA- TION' or mrcmeau.

STARTING-SWITCH FOR MOTORS.

Patented May 4, 1920.

Application filed September 18, 1916, Serial No. 120,843. Renewed March 24, 1920. Serial No. 368,317.

To all whom it may concern:

Be it known that we, HARRY J. L. FRANK and LEON H. FRANK, both citizens of the United States of America, residing at Detroit, in the County of Wayne and State of 'Michigan, have invented. certain new and 1 useful Improvements in Starting-Switches time.

for Motors, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to starting switches for motors and it is the object of the invention to obtain an improved construction in which the motor circuits are closed through fuses when the. motor is normally running and closed through circuits around the fuses when the motor is starting; in

which itis impossible to start the motor switch casing showing the trip mechanism with their contacts;

for the switch;

Fig. 2 is a perspective view of the improved switch with its trip mechanism;

' Fig.3 is a cross-section through the main and auxiliary switch blades in engagement Fig. 4- is a side elevation of the switch casing showing a modified construction of the trip mechanism.

A is the crank handle for operating the switch. B is a shaft having a crank B therein for engaging the switch blades C, C and C of a knife switch. Eachof these blades is composed of two separate members D and E, the former being the main switch blade and arranged centrally, while the latter is the auxiliary switch blade andis of inverted U-shaped cross section embracing the blade D. Both blade members D and are pivoted to a common center F and the corresponding blade members of the several blades C, C and C are connected by insulator bars G and G, respectively.

The crank B is mechanically connected to the insulator bar G by eye-bolts H and the arrangement is such that in rocking the crank handle A to' close the switch, both into circuit through a bar L which short circuits the fuse K. The switch contact to which the separate blade members are piv-A.

oted is connected to the line contact F while the switch contacts I and I- and J and J through the bar L and fuse K respectively are connected to the line contacts F Thus, in operation, when the switch is closed the blade members E will first contact with the contacts I and I and close the shunt circuit about the fuse K so as to relieve the latter from the starting load and prevent blowing of thefuse. The switch will remain in this condition as long only as the handle A is manually held down, the spring M secured to the casing A which incloses the switch, engaging the crank B and tending to open the switch. As soon as the handle A is released the spring M Will rock the shaft 13 and its crank B in the reverse direction, thereby opening the circuit closed by the member E and continuin the circuit through the blade members which are in series with the fuse K. Guards R secured to the member E prevent arcing of the electric current.

Return movement of the shaft B is arrested by a catch member N rotatably mounted thereon, which engages a detent O pivoted upon a side of the casing A andwhich may be tripped by a handle P depending from the detent O and extending below the casing A. sufficiently to be grasped, a coil spring S secured to-the casing and detent normally maintaining said detent in position to engage the catch member. The catch member N is provided with a projection O for engaging the detent O and with projections 0 extending into the path of the handle A for engaging the same,

B will return to its original position and through the medium of the lost motion link age Q the blades'D will be opened from their contact members J and J.

In the modified construction of trip mech anism as shown in Fig. l the catch member N is fixedly mounted upon the rock shaft B and the handle A is rotatabl mounted thereon. The catch member 2 is cam shaped and provided with a projection O? for engaging the detent O pivoted on the casing A and the handle 2 is provided with a lug T on its inner face, the arrangement being such that the lug T engages the catch member in one direction of rotation ofthe handle-to rotate the catch member and the rock shaft upon which the catch member is fixedly mounted and in the opposite direction of rotation the detent to disengage the same from the catch member thereby releasing the switch blades. The

spring S normally maintains the detent O in engagement with the catch member.

' What we claim as our invention is: v

1. A switch, comprising two-part blades, the operation of one of said blades being dependent upon the other, means for manually actuating said other blade in onedirection of rotation, yieldable means for actuating said other blade in the reverse direction,

' means for maintaining said dependently operated blade inthe position adjusted by said other blade in its first mentioned direction of rotation, means for limiting the movement of said other blade in the reverse dl'. rection, andmeans for actuating said limiting means to permit furthermovement of said other blade in said reverse direction.

2. A switch, comprising two-part blades, the movement of one of said blades being dependent upon the other blade, a shaft having a crank for operating said other blade, trip mechanism permitting movement of said shaft inone'direction to close said other blade and its dependently moving blade and limiting movement thereof in the opposite direction, and means for actuating said trip mechanism.

3. In a switch, the combination with sepa- .rate blades, of a rock shaft for operatin spaced projections in the path of movement of said actuating means permitting of relative movement thereof, and a separate projection, a pivoted detent for engaging said separate projection, and a handle for actuating said pivoted detent to trip said catch member.

5. In a switch, two-part blades, one of said blades contacting with and actuatin the other of said blades in one direction 0 movement, a lost motion connection between said blades for actuating said second mentioned blade from the first mentioned blade, a rock shaft for operating said first mentioned blade, and a catch member limiting the return movement of said rock shaft to prevent actuating engagement of said first mentioned blade, and said member secured to the other blade, and means for tripping said catch member.

6. A switch, comprising two-part blades, a rock shaft for operating said blades, trip mechanism permitting movement of said shaft in one direction to close said blades and limiting movement thereof in the opposite direction to permit the opening of one blade, the other remaining closed, and means for actuating said trip mechanism.

7. In a switch, the combination with separate blades, of a rock shaft for operating the same, a handle secured to said rock shaft for actuating the same, a catch member rotatably mounted on said rock shaft adapted to contact with said handle to permit of relative rotation, and a movable detent for engaging said catch member.

8. In a switch, the combination with separate blades, of a rock-shaft for operating the same, relatively movable catch and handle members upon said rock shaft adapted to engage each other, one of said members bein secured to said rock-shaft, land 'a'detent or engaging said catch mem- 9. In a switch, the combination with separate blades, of a rock-shaft for operating thesame, said rock shaft, one of sa-id members being secured thereto, means for engagin and retaining said last mentioned mem er in a predetermined position, and means for actuating said last mentioned member through the other into said predetermined position relatively movablemembers upon said other blade, trip mechanism-permitting movement of said operating means in one direction to close said other blade and its dependently moving blade and limiting movement thereof in the oposite direction, and means for actuating said trip mechanism.

11. In a switch, the combination with a line contact of main and auxiliary blades connected to said line contact, a second line contact, main and auxiliary blade contacts insulated from each other and adapted to be engaged respectively by said main and auxiliary blades, a fuse connecting said second line contact with said main switch contact, an electrical connection between saidsecond line contact and said auxiliary switch contact, and means for actuating one of said blades, the operation of said other .blade being dependent upon the actuated blade,

12. A switch, comprising two part blades, the movement of one of said blades being dependent upon the other, means for actuating said other blade in one direction of movement, means for actuating said other blade in the reverse direction, means for maintaining said, dependently operated blade in the position adjusted by said other blade in its first mentioned direction of movement, means for limiting the movement of said other blade in the reverse direction, means for actuating said limiting means to permit further movement of said other blade in said reverse di ection, and a connection be tween said blades for moving said dependently operated blade in said reverse direc tion.

lntestimony whereof we aflix our signatures.

scans-Yo. L. FRANK. LEON FRANK,

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