Патент USA US2108428код для вставки
Feb. 15, 193.. A. BROWN ET AL 2,10,42 ELECTRIC SWITCHJPARTICULARLY FOR USE IN CONTROL OF RAILWAY SIGNALS Filed Sept. 16, 1956' m’ 7 12 14 HE) INVENTORS A. BROWN , R.H.DUNN AND D.G.MOKIE ‘ATTORNEY I Patented vFeb. 15, 1938 2,18,42 UNITED STATES PATENT OFFiE 2,108,428 ELECTRIC swrron, PARTICULARLY FOR USE IN CONTROL OF RAILWAY SEGNALS Andrew Brown, Roland Harris Dunn, and David Gordon McKie, London, England, assignors to International Standard Electric Corporation, New York, N. Y. Application vSeptember 16, 1936, Serial No. 101,028 ' In Great Britain 9 Claims. (Cl. 200—153) This invention relates to electric switches having parts moved by different means and adapted to close (or open) an electric circuit when the parts so moved are in given relative 5 positions. One feature of this invention consists in an electric switch of the kind referred to compris ing a part-movable by one means, a second part movable by a second means, a third part mov able by both the ?rst and second means, and means for closing (or opening) an electric circuit when contacts on all three parts are in a given relative position. September 27, 1935 ‘ Another feature of the invention consists in an 15 electric switch of the kind referred to compris ing a ?rst disc carrying contacts and rotatable directly by one means, a brush rotatable directly by a second means over said contacts and also over contacts on a second disc for completing tion again, and it allows incounting and out— counting to take place simultaneously. One embodiment of the invention will be de scribed with reference to the accompanying drawing but it is to be understood‘ that the in 5 vention is not restricted to that embodiment, nor to a switch intended for this particular appli— cation. Figure 1 of the drawing shows a side view or 10 the'switch, half in cross section, whilst Figures 2 to 6 illustrate details thereof. Referring to the drawing a ratchet wheel 2 and an insulating ?bre disc 3 are ?xed to a cen- ' tral shaft I, journalled in a suitable frame (not shown). are rotatably mounted on a spider 6 and engage with the sun wheel 4 and with an outer sun 20 an electric circuit, andmeans for rotating said . wheel 7. second disc by said ?rst and. second means in step down ratios that are complementary to one another. 7 Yet another feature of the invention consists in an electric switch of the kind referred to for controlling an electric circuit according to the relation between two different series of impulses comprising ratchet wheels adapted to be stepped by the respectiveseries of impulses, inner and outer sun wheels attached to said ratchet wheels, a disc carrying contacts in said circuit attached to one of said sun wheels, a disc carrying other contacts in said circuit attached to a planet wheel meshing with each of said sun wheels, and a disc carrying‘ a brush adapted to bridge said contacts to complete said circuit and attached to the other of said sun wheels. ' One application of the invention is to switches used for counting the wheels of a train into and 4:0 out of a given section of track. The spider 6 is mounted on a sleeve 8 freely rotatable on the shaft I. The sleeve 8 carries a second insulating ?bre disc 9. The outer sun wheel ‘I is ?xed to an outer sleeve Ill freely rotatable on sleeve 3 and carrying a ratchet wheel II and an insulating ?bre disc I2, which latter carries‘ a double brush l3 (Figs. 1 and 2) wiping over the peripheries of the discs ' 3 and 9. One terminal of the circuit being con trolled is connected to a brush. (not shown) wip ing on a ‘metal annulus l4 ?xed to the insulat 30 ing ?bre disc l2 on the opposite side from that to which the brush I3 is ?xed. The annulus i4 is cut away as shown in Fig. 3 in order to be clear of the rivets fastening brush l3 to disc H. An other brush i9 (Fig. 2) is ?xed on the side of the disc l2 opposite to that on which the annulus M is ?xed, but connected to the annulus by studs passing through the ?bre. ‘Brush l9 wipes on a metal plate 55 (Fig. 4) ?xed to the insulated The signals are '?bre disc 9. automatically set to danger when the ?rst wheel enters the section,- and by means of treadles operated by‘the passage of the wheels, or by other means, an impulse is sent to control equipment 4 01 for the signals for each wheel entering the track section and another impulse for each wheel leav ing the section. When the same number of out counting as in-counting impulses has been re ceived a circuit is completed for a relay which restores the signals to clear or allows them to be manually restored. For such application the switch of the present invention possesses many advantages. Itallows of a large total count be 55 The inner sun wheel 4 of a sun and 15 planet gear is secured to the ratchet wheel 2. Planet wheels, of which one only (5) is shown, fore the incounting portion reaches initial posi The circuit terminal is thus effec 40 tively connected to the plate Iii. The edge of this plate is within; that of the ?bre'disc except for a projection 20 where it is level therewith. The projection 20 extends over sufficient distance for the brush iii to contact with it at the initial position and for the distance through which discv 9 is moved by two steps of either of the ratchet wheels 2 or H to each side of the home position. On one side of the disc 3 which is also of insu lated ?bre is mounted ametal plate 16 Fig. 6 which has two projections 2| and 22 level with the ?bre each two steps removed from home po sition, and is connected by metal studs passing through the ?bre to a metal annulus l ‘I (see Fig. .5) on the other side of the disc 3. A metal an 55 2 2,108,428 nulus l8 surrounding, but separated from the steps apart. It is also clear that the projections annulus I‘! has a projection 23 level with the ?bre disc 3 at the home position. Circuit ter minals are connected to brushes 24 and 25 wip ing over the annuli ll and i8 respectively. and depressions could be interchanged so as to make an electric circuit in all positions but the desired one or few. It is also clear that, as re In operation, the switch is arranged originally in the home position in which the brush l3 rests on the projections 23 and 20 and so completes a circuit between the plate [5 and annulus H3. gards certain features of the invention, the two sun wheels could be driven continuously instead of step by step. What is claimed is: The relay responding to incounting impulses op crates a pawl stepping one of the ratchet wheels 1. An electric switch of the kind referred to comprising a contact part movable by one means, a second contact part movable by a second means, and the relay responding to out~countlng im a third contact part movable by both the ?rst pulses operates a pawl stepping the other ratchet and second means and means for closing (or opening) an electric circuit when contacts on all three parts are in a predetermined relative po wheel in well known manner. It is immaterial 15 which ratchet wheel is rotated by in-counting impulses but for simplicity of description it will be assumed that this is the ratchet wheel 2. On the ?rst in-counting impulse ratchet wheel 2 is rotated through the distance of one tooth. Disc 3 is rotated directly, an equivalent amount, and disc 9 is rotated through the sun wheel it and planet wheel 5 by a lesser distance. The ?rst sition. 2. An electric switch as claimed in claim 1 in which the three movable parts are rotatable discs. 3. An electric switch as claimed in claim 1 in which the said first and second means cause 20 impulse is sufficient to break the circuit com movements of the said third part in a ratio dif ferent from those in which they respectively cause the movements of the ?rst and second pleted in the home position between annulus l8 parts. 25 and plate l5. Further in-counting impulses con tinue to rotate the discs 3 and 9 and on the com pletion of two steps a circuit is completed be tween the plate l5 and plate ll’. After another step this circuit is broken, and both circuits con tinue to be broken during further incounting im pulses. The number of revolutions of disc 3 be fore both discs 3 and 9 are back in initial rela tive positions depends on the relative diameters and numbers of teeth on the sun wheel 4 and planet wheel 5. In order to meet railway re quirements that a total number of 599 wheels can be counted, it has been found satisfactory to provide 60 teeth on the sun wheel 4 and 12 teeth on the planet wheel 5, the diameters being in the same ratio. Then twelve complete revo lutions of the ratchet wheel 2 are necessary be fore the discs 3 and 9 return to the same rela tive positions. There are 50 teeth on ratchet wheel 2 and therefore 600 steps are made before this occurs. There are 84 teeth on the sun wheel ‘I and the diameter of this wheel is in correspond ing ratio. When ratchet wheel I l, which is pro vided with the same number of teeth as ratchet wheel 2, is stepped during the out-counting (in the same direction as ratchet wheel 2) the brushes l3 and sun wheel ‘I are rotated corre spondingly, whilst the disc 9 is rotated through the sun and planet gearing in a ratio comple mentary to that by which it was rotated by The circuits are again closed when the discs 3 and 9 and brushes I3 are again in the same relative positions and this occurs '- ratchet wheel 2. 4. An electric switch of the kind referred to comprising a ?rst disc carrying contacts and ro tatable directly by one means, a brush rotatable directly by a second means over said contacts and also over contacts on a second disc for com pleting an electric circuit and means for rotating said second disc by said ?rst and second means in step down ratios that are complementary to one another. 5. An electric switch as claimed in claim 4 in which said ?rst and second discs are attached to inner and outer sun wheels of a sun and planet gearing driven by said ?rst and second means and said third disc is driven by a planet wheel meshing with said inner and outer sun wheels. 6. An electric switch as claimed in claim 4 in 40 which each of said sun wheels is driven in a step by step manner by means of a pawl acting on a ratchet wheel attached thereto. 7. An electric switch of the kind referred to for controlling an electric circuit according to the 45 relation between two different series of impulses comprising ratchet wheels adapted to be stepped by the respective series of impulses, inner and outer sun wheels attached to said ratchet wheels, a disc carrying contacts in said circuit attached to one of said sun wheels, a disc carrying other contacts in said circuit attached to a planet wheel meshing with each of said sun wheels, and a disc carrying 'a brush adapted to bridge said con tacts to complete said circuit and attached to 55 When the number of out-counting impulses is the the other of said sun wheels. 8. An electric switch as claimed in claim '7 in which the said sun wheels are rotated in the same same as those by which ratchet 2 was previously direction. 60 stepped. It is clear, however, that in-counting and out-counting may take place simultaneously. It is to be understood that the invention is not limited to the precise details shown and de scribed. For example, other gear ratios might be used for counting up to the same total num ber or up to other different totals. For use in other applications than that speci? cally referred to the projections on which brush l3 makes contact could be arranged to close a circuit when the discs are a given number of 9. An electric switch as claimed in claim '7 in 60 which the inner one of said sun Wheels and the disc attached thereto is mounted on a shaft, the said planet wheel is mounted on a spider carried on a ?rst sleeve rotatable on said shaft and the outer of said sun wheels and the disc; carrying the brush are mounted on a second sleeve rotat able on said ?rst sleeve. ANDREW BROWN. ROLAND HARRIS DUNN. DAVID GORDON MCKIE.