US1990566A - Automatic intermittent switch - Google Patents

Description

Feb. 12, 1935. L. A. RAMSDEN AUTOMATIC INTERMI'I'TENT SWITCH Filed May 0, 1935 5 Sheets-Sheet l Feb. 12, 1935. L. AJRAMSDEN AUTOMATIC INTERMITTENT SWITCH Filed May 10, 1933 3 Sheets-Sheet 2 INVENTOR Feb. 12, 1935 L. A. RAMSDEN 1,990,566

AUTOMATIC INTERMITTENT SWITCH Filed May 10, 1933 3 Sheets-Sheet 3 Patented Feb. 12, 1935 UNITED STATES PATENT OFFICE AUTOMATIC INTERMITTENT SWITCH Louis Alfred Ramsden, Failsworth, England Application May 10, 1933, Serial No. 670,318 In Great Britain June 2, 1932 4 Claims. (Cl. 172-126) This invention relates to improvements in pin b causes the other lever A to move in the automatic intermittent electric switches of the same direction. type in which the switch arm is formed in The amount of movement allowed to the lever two parts pivoted together and connected by a A is constant and corresponds with the distance spring and moved from one extreme position to of travel of the pin b The lever A is provided 5 the other by the common armature of two solewith a triangular shaped contact a which at noids energized alternately. the end of each movement of the lever A comes The invention comprises two electromagnets in contact with one of two stops a mounted on or solenoids, energized alternately by a spring but insulated from the casing. These stops a operated contact member controlled by the arform the terminals for leads from the solenoid 10 mature of the solenoids the speed of movement coils and as the contact a enages one or other of this contact member from one extreme posiof these stops a the circuit to one or other of tion to the other being retarded by gearing to the solenoids B is completed and the armature provide a time lag for the operation of the b is moved in a direction to break the circuit so switch. made. The stops 0. are carried on a plate A of 15 The invention further comprises the provision insulating material adjustably mounted on the of a plurality of cam discs given a rotary movecasing by a spindle a screwing therethrough to ment by the switch to control external electric propel a. bracket a affixed to the plate A. To

circuits. ensure that the armature b shall remain in one The invention will be described with reference or other of its extreme positions when neither to the accompanying drawings:- of the solenoids B is energized during the travel Fig. 1 is a front elevation showing the 0011- of the contact a. a spring pawl e mounted on tact maker in one extreme position. the casing E travels over a roller 11 carried by Fig. 2 is a similar elevation showing the 0011- the lever D, tact maker in the other extreme position. The rate at which the spring (1 causes the 25 Fig. 3 is a side elevation. lever A to travel between the two stops a is 4 is a Section 011 ine ig. 1. controlled by gearing C through a connecting 5 is a p of the m g t rod 0 pivoted to the lever A and to a toothed Fig. 6 is a detail view of the contact maker. quadrant The quadrant gears th a pin- Fig. 7 is a detail view of the lever D and star ion 0 on a spindle 0 also carrying a further 30 wheel. pinion c which engages a pinion c on a spindle Fig. 8 is a detail view of the cam discs and carrying a wheel 0' engaged by an escapement contacts for exterior ir i c pivoted on the casing on a spindle 0 The The switch is opera-ted y a Contact maker 63 gearing retards the rate of movement of the controlled by two solenoids B through gearing t t d th o ition of the stops a de- 35 C W c provides a time lag the movement termines the distance which the contact a o the Contact maker has to travel between them.

The solenoids B are arran ed to be energized Current is fed to the solenoids by a lead from alternately and are constructed with common n i s lated terminal 2 on the casing, the rearmatu e b a p t0 be drawn first in one turn lead 3 from one solenoid being connected direction and then in reverse by first one and t one top and the return lead 4 from the then the other of the solenoids. The centre th r lenoid t the second stop a The con- DOTtiOn 0f the armature b is recessed and D tact a completes the circuit to the casing into vided with a p n 1) Which engages a Slot (1 in which is screwed a return terminal 5. By varythe lower end of a lever D pivoted about its ing th position of the plate A carrying the 45 uppe end On e s g E. The lever D is thus stops a any desired period of time for the travel given a movement through an arc of a circle as of the contact a may be obtainedthe armature b reciprocates. The lever D adja- Th it h may be employed to operate any cent its lower end, carries a p d1 p j c external circuit and will now be described conthrough a slot a in one of a pair of diametrically trolling four such external circuits.

oppo d leversA A1 pi on c mmon pindle The spindle o upon which the levers A A a to the casing and forming the contact maker. are pivoted extends rearwardly through the front The free ends of the levers A A are connected of the casing E and through a slot (1 in the together by a spring a which as the free end of lever D. A star wheel D is mounted on the & the lever A swings over its dead centre with the spindle a the teeth of which are engaged by pins d on the lever D by which the star wheel is rotated on each oscillation of the lever.

Two discs F F having a series of cam faces are also mounted on the spindle a each disc being engaged by one or more rollers g (two are shown in the drawings). Each roller g is mounted on a lever g and held in contact with the cam surface by a spring g A contact arm G is mountedon each lever g and as the cam disc rotates is intermittently brought into and out of contact with an insulated terminal 6 on the casing E thus intermittently making and breaking an electric circuit completed through the casing by the return terminal 5.

To provide a good contact between the arms G and the casing E flexible strips g3 are screwed into the arms and the casing. r

In the drawings four such external circuits are shown operated by the two cam discs F, F but by employing a greater numberof rollers g on each disc or by increasing the number of discs F F on the spindle a a larger number of external circuits may be controlled.

What I claimas my invention and desire'to protectby Letters Patent is:-

1. intermittent electric switch comprising a casing, a spring operated switch arm, two

' solenoids energized alternately by the switch arm, a common armature for the solenoids, 2. depending .lever "pivoted on the casing, a pin onuthe armatureengaged by the lever, a pin on the leverv to transmit the movement to the contact maker, gearing to retard theoperation of the contact maker, further pins on the depending lever, and a star wheel intermittently rotated in one direction by the pins.

2. An intermittent automatic switch comprising a casing, a spring operated switch arm, two solenoids energized'alternately by the switch arm, a common armature for the solenoids, a lever pivoted to the casing and oscillated by the armature, a pin on the lever to engage a slot in the switch arm, a lever pivoted to the switch arm, a quadrant pivoted to the casing and partially rotated by the lever and escapement gearing operated by the quadrant to retard the rate of movement of the lever and switch arm.

3. An'intermittent automatic switch comprisinga casing, a spring operated switch arm, two

solenoids energized alternately by the switch arnxa common-armature for the solenoids, a lever pivoted to the casing and oscillated by the armature, a pin on the lever to engage a slot'in the lower portion of the switch arm, a lever pivoted to the upper portion of the switch arm, a triangular contact member on the upper pore tion of the switch arm adjustable contacts on the casing engaged by the triangular contact member, a quadrant pivoted to the casing and partially rotated by the lever and escapement gearing operated by the quadrant to retard'the rate of movement of the lever and switch arm.

4. In an intermittent electric switch as in claim 2 pins on the oscillating lever, and a star wheel engaged alternately by each pin by which. it is rotated.

' LOUIS ALFRED RAMSDEN.

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