US1948758A

US1948758A - Timing device

Info

Publication number: US1948758A
Application number: US445512A
Authority: US
Inventors: Charles H Hodgkins
Original assignee: Westinghouse Electric and Manufacturing Co
Current assignee: CBS Corp
Priority date: 1930-04-18
Filing date: 1930-04-18
Publication date: 1934-02-27
Anticipated expiration: 1951-02-27

Description

Feb; 27, 1934.

c. H. HODGKINS 1,948,758

TIMING DEVICE Filed April 18, 1930 3 Sheets-Sheet l fiy/ INVENTOR C/za r/es HHOay/U/IS.

4/1 ATTQRNEY Feb 27, 1934. c H HQDGK|N$ 1,948,758

TIMING DEVICE Filed April 18, 1930 3 Sheets-Sheet 5 Patented Feb. 27, 1934 UNITED STATES PATENT OFFNIE Application April 18, 1930. Serial No. 445,512

Claims.

My invention relates generally to tin le-delay devices and particularly to time-delay devices of a mechanical type.

The object or" my invention, generally stated, is to provide a timing device which shall be sim ple and efficient in operation and which may be readily and economically manufactured.

A more specific object of my invention is to provide for adjusting a mechanical timing device to function after the lapse of any predetermined time interval within its time range.

Another object of my invention is to provide a timing device in which the time of operation shall not be affected by temperature variations and the position of mounting.

According to my invention, 1 provide a timing device which comprises an escapement mechanism in which the angular movement of a balance wheel may be changed to vary the time of operation.

For a fuller understanding of the nature and objects of my invention, reference may be had to the following detailed description, taken in conjunction with the accompanying drawings, in which:

Figure 1 is a view, in front elevation, of a motor starter in which a timing device, constructed in accordance with my invention, is utilized to introduce a time interval between the closing of the contact members of the motor starter;

Fig. 2 is a sectional view, taken along the line 1I-II of Fig. 1.

Fig. 3 is a sectional view, taken along the line III-III of Fig. 4, showing details of the construction of the timing device and Fig. 4 is a view, in front elevation, of the timing device.

In this instance, the timing device is shown disposed to control the operation of a switch. Referring to the drawings, the switch shown in Fig. 1 comprises an electromagnetic contaotor provided with a magnet coil 11 disposed to actuate an armature 12, which is pivotally mounted on a bracket 13.

It will be observed that a contact member 14 is mounted on the armature 12 and is disposed to engage a contact member 15 when the armature 12 is actuated by the magnet 11. Two additional contact members 16 and 17 are mounted on an arm 18 which is pivotally mounted on brackets 19. The arm 18 is actuated by two springs 20 and 21, supported on

pins

22 and 23, respectively, which are attached to the armature 12. The springs 20 and 21 are compressed when the armature 12 and contact member 14 stand in the posito engage contact in hers 24 and 25, respectively, when the cosed It will be observed that contact in 24 and are so mounted on the frame of the contactor that the contact Member is engaged by the contact 3 r 16, before the contact member 17 engages contact member 25 when the arm 18 is actuated to close the switch.

As shown in Fig. 2, a rack 26 disposed to engage a pinion 27 of a timing device 28. The rack 26 is pivotally mounted on an arm 29, attached to the contact-carrying 18. be seen that the rack 26 engages the pinion 2 and will operate it when the arm 18 is actuated about its pivot point by the springs 20 and 21. The movement of the arm 18 will be governed by the rate of rotation of the pinion 2'? of the n timing device 28.

As shown in Fig. 3, the timing device 28 comprises the pinion 27, mounted on a shaft 30, which is supported in the frame 31 by

bearings

32 and 33. A ratchet wheel 34 is attached to so so constructed that the rack 26 will drive the 85 pinion when the rack is being moved in one direction only, that is, when the arm 18 is actuated by the springs 20 and 21 to cause contact members 16 and 17 to engage

contact members

24 and 25, respectively.

A pallet 35 is pivotally mounted on a pin 36 and is disposed to engage the teeth of the ratchet wheel 34 to control the rotation of the ratchet wheel. The pallet 35 is provided with an upwardiy extending arm 37 which has its end curved at a right angle to engage a slot 39 in the face of the balance wheel 38. Therefore, when the arm 37 of the pallet 35 is oscillated by the ratchet wheel 34, the balance wheel 38 will be oscillated. The speed of the ratchet wheel will be governed by the amplitude of oscillation of the balance wheel.

The balance wheel 38 is pivotally mounted on a pin 40, which extends through a slot 41 in the cover plate 42 of the timing device 28. The balance wheel 38 may be held in a predetermined position by a nut 43 which engages a spring washer 44.

As shown in Fig. 3, a shoulder is provided on the pin to engage a washer 45 to prevent the balance wheel 38 from binding when the nut 43 is tightened against the spring washer 44. It can be seen that the relation of the balance ,wheel 38 to the arm 3'? or" the pallet may be readily adjusted by raising or lowering the pin in the slot 41.

It can also be seen that the angular movement of the balance wheel 38, which is oscillated by the arm 37 of the pallet 35, will be varied as the position of the balance wheel is changed with reference to the arm 37. Varying the angular movement of the balance wheel will change its period of oscillation, thereby changing the rate of oscillation of the pallet and, consequently, the rate of rotation of the ratchet wheel.

In the operation of the switch, when the magnet coil 11 of the contactor 10 is energized, the armature 12 is attracted, and the contact meniber 14 is immediately actuated into engagement with contact member 15. Springs 20 and 21 are compressed when the armature 12 is actuated into the switch-closing position by the magnet 11, and the arm 18 is actuated angularly about its pivot point. The movement of the arm 18 is so controlled by the rack 26, which engages the pinion 27 of the timing device 28, that a predetermined time interval lapses between the engagement of

contact members

14 and 15 and the engagement of

contact members

16 and 24, and also contact members 17 and 25.

It will be readily understood that a variation in the interval of time between the engagement of the respective contact members of the contactor 10 may be obtained by adjusting the tiniing device 28. The rotation of the ratchet wheel 34, driven by the rack and pinion, is governed by the pallet 35, which engages the teeth of the ratchet wheel. As the ratchet wheel is rotated,

the arm 37 of the pallet oscillates and thereby causes the balance wheel 38 to oscillate.

The rate of rotation of the ratchet wheel may be varied by adjusting the position of the balance wheel, with reference to the arm of the pallet, to change the angular movement of the balance wheel. In this manner, the rate of rotation of the pinion 27 may be controlled and, consequently, the movement of the contact-carrying arm 18 may be governed to control the time of engagement of

contact members

16 and 24 and also contact members 17 and 25, respectively.

When the magnet coil 11 is deenergized, the respective contact members or" the contactor 10 may be immediately disengaged, since, as previously explained, the teeth of the rack 26 engage the pinion 2'7 when the rack is being moved in one direction only.

Since numerous changes may be made in the above-described construction, and different embodiments of the invention may be made without departing from the spirit and scope thereof, it is intended that all matter contained in the above description or shown in the accompanying draw ings shall be interpreted as illustrative and not 7 in a limiting sense.

I claim as my invention: 1. In an escapement governor, in combination,

a ratchet wheel disposed to be rotated in either direction, a slotted balance wheel disposed for oscillatory movement for controlling the speed at which the ratchet wheel may be driven, means interposed between the ratchet wheel and the balance wheel for translating the rotary motion of the ratchet wheel into an oscillatory motion and cooperating with the slot in the balance wheel to oscillate the balance wheel, and means for varying the amplitude of oscillation of the balance wheel.

2. In an escapement governor, in combination, a ratchet wheel disposed to be rotated in either direction, a slotted balance wheel disposed for oscillatory movement for controlling the speed at which the ratchet wheel may be driven, a double-action pallet interposed between the ratchet wheel and the balance wheel for translating the rotary motion of the ratchet wheel into an oscillatory motion, a pallet arm cooperating with the slot in the balance wheel to oscillate the balance wheel, and means for varying the amplitude of oscillation of the balance wheel.

3. In an escapement governor, in combination, a ratchet wheel disposed to be rotated in either direction, a slotted balance wheel disposed for oscillatory movement for controlling the speed at which the ratchet wheel may be driven, a doubleaction pallet interposed between the ratchet wheel and the balance wheel for translating the rotary motion of the ratchet wheel into an oscillatory motion, a pallet arm cooperating with the slot in the balance Wheel to oscillate the balance wheel, and means for varying the position of the balance wheel with reference to the pallet arm, whereby the amplitude of oscillation of the balance wheel may be varied.

4. In an escapement governor, in combination, a ratchet wheel disposed to be rotated in either direction, a slotted balance wheel disposed for oscillatory movement to control the speed at which the ratchet wheel may be driven, a doubleaction pallet interposed between the ratchet wheel and the balance wheel for translating the rotary motion of the ratchet wheel into an oscillatory motion, a pallet arm cooperating with the slot in the balance wheel to oscillate the balance wheel, means for mounting the balance wheel in a predetermined relation to the pallet arm, and means for adjusting the relation of the balance wheel to the pallet arm, whereby the amplitude of oscillation of the balance wheel may be varied.

5. A timing device comprising, in combination, a double-action escapement mechanism, means for driving the escapement mechanism, a slotted balance wheel disposed to govern the rate of movement of the escapement mechanism, said balance wheel being driven by an arm of the escapement mechanism which engages the slot in the balance wheel, means for varying the position of the end of the arm in the slot in the balance wheel to vary the rate of movement of the escapement mechanism, whereby the rate of rotation of the driving means is varied.

CHARLES H. HODGKINS.