US1109234A - Retrieving-trolley. - Google Patents

Description

e. E. LANG. RETRIEVIN'G TROLLBY.

APPLICATION FILED JUNE 22, 1908.

Patented Sept. 1, 1914.

7 SHEBTSSHEET 1.

A hm mw win eases I THE AORRIS PE TERS CO. PHOTOLITHIL. WASHINGTON. Dv 1:.

G. E. LANG.

RETRIEVING TROLLEY.

APPLICATION FILED JUNE 22, 1008.

1,109,234.- I Patented Sept.1,1 914.

7 SHEETSSHEET 2.

[rave/2504' THE .JQRRIs PETERS comm-4010 LITHQ. WASHINGTON. n. .1.

O. E. LANG.

RETRIEVING TROLLEY.

APPLICATION FILED JUNE 22, 1908 l 1,109,234 I I Patented Sept. 1, 1914 7 SHEETsAHBET 3.

fade/252 07- CfiarZesZ'a 6726 m2 MZ s j 55 f ymvem /1642! mm THE NORRIS PETERS 120.. P'HOTO-LITHO. WASHINGTON, D. x

G. E. LANG.

RETRIEVING TROLLEY.

APPLICATION FILED 111111222 1908.

Patented Sept. 1, 1914.

7 SHEETS-SHEET 6.

v THE NORRIS PEiEkS CQ, PJLIOTO'LITHQ, WASHINGTON. D. C.

G. E. LANG. RBTRIEVING TROLLEY. APPLICATION FILED JUNE 22, 1908.

- Patented Sept-1, 1914.

7 SHBBTSSHEET 7.

[nae/22 0? GB /W THE NOR-R15 PETERS CQ, PHOTD-LITHO. WASHINGTON. D. C

GHARLESEUGENE LANG, or Los'AneELEs, CALIFORNIA.

nETRIEvINe-TRoLLEY.

To all whom it may concern.

, parts hereinafter Be it known that I, .GHARLES EUGENE LANG, a citizenof the United States, residing at Oakland, in the county of Ala medaand State of California, have invented a new and useful Retrieving-Trolley, of which the following is a specification.

Thisinvention relates to an overhead trolley for electric railway cars which, in case of escape fro1nthe trolley-wire, will automatically lower to a position below the level of the trolley-wire and span wires, and

which can be creturned' to operative 'position by simple manipulation by the conductor or other attendant. a

An object of the invention is to provide means whereby the trolley-pole will be started on its way to its lowered position by; the springs which normally hold it against the trolley-wire and which. lift the pole to the position from which it willbe" returned by the force of said springs assisted by gravity. x a a 1 The invention comprises the; retrieving trolley, and the parts and combinations of more, particularly de scribed.

It is .a principle ofthe operation of this invention that thetrolleypole is normally forced upward bythe lifting means, as one or more'springs, and therebypressed against the trolley-wire, and said .pole whilerestrained from sudden upward movement is free to rise and lower to accommodate the trolley to the different heights ofthe trol-' ley-wire above the cargbut in case the trolley-pole is so unrestrained as to allow itto suddenly rise, parts are releasedwhile the pole is within its normal working range to allow the trolley-pole to bodily descend. by gravity, and the force of the springs operates for an instant to start the trolleypole downward.

I do not limit myself to the specific construction shown, as changes within the scope of the appended claims are contemplated.

An object of the invention is to limit to a minimum the upward travel of the trolley at any time it leaves the trolley-wire. This object is in a measure accomplished by mak-j ing provision whereby the tripping of the trolley-pole for its return is accomplished by aquick upward movement regardless of the positionfrom which the trolley starts. In practice, provision is made whereby the I Specification of Letters Patent. Patentd s e t. 1, 1914 Application filed June 22,19es. Seria1 No. 439,878. i I l l rapid upward movement or the trolley after it lQHJVBSthGwWlIQ will effect the release of l the trolley-polebefore the trolley-wheel has traveled to exceed twelve inches, regardless of the. height from which the trolley-wheel starts.

. Another object of theinventio-n is to leave the trolley free togswingso long as it ism operative position, and to lock the samev aga nst swinging laterally when out of op-' ;.erat1ve pos1t1on',fso as'to avoid all danger of riking, anyobject at the side of the track. An Ob ectof the-invention is to so coni struct-and arrangethc trolley pole carrying and supporting devices that the force which sustains the trolley-polejis at one time applied in such a directionas to lift the trolfey-pole, and at another time is applied in such a direction as to be ineffectual to lift the pole, but may beeffectualtocushion the pole against too, great descent- A furtherobject is to avoid any tension; on the pole-lifting springs when the trolley is'out of commission, thus doing away with the bendingqof the pole which strong is common withtrolleysof thepresent cone struction invcases \where a "car is provided w th two oppositely-directed trolley poles,

one. of which is, fastened down While the other is-in commissionp I l l Other objectsaand advantages may appear fro'nrthe subj'oined detailed description;

The accompanying drawings illustrate the invention in the form most desirable.

For convenience of illustration the figures at present deemed 1 are not all on thesame scale. Figures'l, 4;,

(5, Sand 9 areon one scale; Figs. 2, 3, 5 and 7 are on a larger scale Figs. 10,11, 12,13 and 14 .areona'still-larger scale; and Figs. 15, 16, '17, 18 and l9are on a commonscale practicallytwice that of-Fig. 1.

Fig. 1 is a side. elevation of: a' trolley I embodying this invention mounted for operation on a railway car, a portion of which is'shown. .The trolleyis shown in solid lines a in that position at ,which it comes to rest afterthetrolley wheel has escaped fromthe trolley-wire. Four other positions are shown in dotted and broken lines. The five p0.-

sitions shown are respectively lettered I a, b, c, 0?, e; the position 5 being that to which the trolley-pole will be drawn from resting position a by the attendant in order to bring the parts into the positions at that from which the pole and wheel returnto resting position a. Arrows indicate the course of the trolley-pole. Fig. 2 is a plan on a larger scale of the trolley-base and foot detached with latch and latch-spring 1 in place. Fig. 3 is an inverted view on the scale of Fig. 2 of the parts shown in Fig. 2. Fig. 4L is a broken elevation from the left of and on the scale of Fig. 1 with parts in operative position, 0. Fig 5 is a sectional elevation on the scale of Fig.2 looking toward the left from line indicated at a2 w Figs. 1, 10 and 11. Fig. 6 is aview on the scale of Fig. 1 looking'toward the right from said line w m with the pole in position 2) shown in solid lines in Fig. 11. Fig.

7 is a fragmental elevation on the scale of Fig. 2 looking toward the right from a line approximately indicated at w w, Fig. 12. Some of the parts are shown in section on said line m a; Fig. Sis a mid-sectional elevation on the scale of Fig. 1, showing the trolley-foot detached, viewed from line na -m Figs. 2, 3, 10 and 1 1. A heel-piece, its pivot and the trolleyfulcrum is also shown. Fig. 9 is a detached view on scale of Fig. 1, showing the inside of one of the trolley-base sections. Fig. 10 is a fragmen tal plan'on a scale greater than that of the preceding figures with parts shown in setting position b. Fig. 11 is a vertical longitudinal mid-section online w 00 Figs. 2, 3, 10 and 14, on scale of Fig. 10. The parts are shown in solid lines in settingposition b. The positions a and 0 are indicated in broken and dotted lines respectively. Parts are broken to expose the connection between a crank and spring. Fig. 12 is a section on said line.x m scale of Fig. 10, showing in solid'lines the trip-ping position 6 which the parts assume just before returning to the resting position a. Broken lines indicate a working position 0 and aretrieving position d from which the parts may have moved to said tripping position e. Fig. 13 is a section on li11e-w a Figs. 10 and 14 scale of Fig. 10. The parts are shown in the working position 0 from which the parts may move to retrieving position cl and on to tripping positione shown in solid lines in Fig. 12 and thence to resting position a shown in broken lines in Fig. 11, from which the trolley-pole may be drawn down to resetting position b. Fig. 1 1 is a plan section on line w 00 Figs. 12 and 13; scaleof Fig. 10. Figs. 15, 16, 17, 18 and 19 are kinematic views illustratingthe operation of the appliance throughout a full cycle. Fig. 15

shows the operative or'working position 0,

Fig. 16, the retrieving or topmost position (Z between the operative position 0 and the tripping position 0. Dotted lines indicate the tripping position and the retraction effected by the force of the spring just after the trolley has moved up from the wire. The trolley pole in Figs. 15 and 16 is broken between the lugs 33 and the trolley wheel to contract the view; Fig. 17 shows the tripping position 6, Fig. 18 represents the resting position a; and Fig. 19, the resetting'position Z) to which the parts may be drawn from position a by the attendant, and in which position the lifting springs become eifective to return the pole to the operative position 0, shown in Fig. 15. In Figs. 18 and 19 the width of the trolley fulcrum slots is exaggerated to avoid confusion.

Corresponding characters indicate corresponding parts in the several views. Some of the parts which are practically duplicates of other parts are distinguished by the use of the same character with the addition of an exponent.

In considering this invention the duplicate parts may be generally regarded as singular the main purpose of the duplication being to give proper balance and strength with minimum size and weight of parts. 2

1 designates a car; 2, an insulating trolley foundation thereon. 3 is a trolley-pole; 4, a trolley-wheel; 5, a trolley-wire, all of the usual construction.

6 is a divided cast metal trolley -base 1 formed of two semicircular sections 7, 7

fastened to each other by bolts 8 and to the insulation 2.bybolts 9.

10 is a trolley-foot antifrictionally supported in the base 6 by antifriction balls 11 which run in two annular grooves 12, 13, in the base and trolley-foot respectively.

. The trolley pole is pivotally mounted as hereinafter set forth and is carried by the foot. Said grooves are semicircular in crosssection and register with each other so that when the semicircular sections 7 7 of the trolley-base are brought nearly together on one side of the trolley-foot and are yet spread far enough apart at the other side to receive the antifriction balls 11, said balls may be inserted one by one into the annular race-way therefor formed by the grooves, until such race-way is appropriately filled with balls. The number of balls employed is preferably less than is sufiicient to fill the raceway; for instance, if the race-way is capable of containing forty balls, thirty-six balls may be inserted, thus leaving plenty of play and insuring a satisfactory distribution of the balls around the race-way. The balls substantially correspond in diameter with the race-way so 21 isa spring-crank shaft j ournaled in the holes 17 and 22 is a latch-lever-pin jour-- naled in the holes 18. a

The trolley pole is shiftably mounted on a heel that is shown as constructed'jof two duplicate parts 23, 23, pivotally mounted outside the standards 14:, 14, by the heeljournal 19 to carry the trolley-fulcrum pin 20 on which the shank 24c of the trolleypole 3 is fulcrumed. The shape and arrangement of the duplicate parts 23, 23, which together constitute the heel, may be noted by reference to Figs. 7, 8, 11 and 12. In Fig. 7 the front edges of said duplicate parts are shown. In Fig. 8 the outline indicated at .23 corresponds to the outline for the side of 23, not shown, in this view. In Figs. 11 and 12 such side outline may also be traced. Said duplicate parts are arranged in parallel planes on a common axis from which they extend downward to be latched by a latch 28 hereinafter described, and upward to form the support of the trolley fulcrum 20. The two parts 23, 23 are not connected together rigidly but they work as aunit and are the equivalent of a single piece. a The heel thus formed of the two parts 23, 23 is kinematically, an

integral element and is formed in two parts,

in the instance illustrated, for convenience of manufactureand for strength and stability. The slots 16 in the standards allow a limited forward and backward movement of the trolley-fulcrum 20 on which is journaled a roller 25 arranged to engage an arm 26 that is fixed to andzextends downwardly and rearwardly from the spring crank shaft 21 that is provided at its ends with rearwardlyprojecting cranks 27 27iwhich are bent into hooks forming crank pins and are in rigid relation to the arm .26. In the kinematic views, Figs. '15 to 19, theroller 25 is indicated by a short are which is in contact with the arm 26 in all positions ex cepting the resetting position I) shown in Fig. 19. Said roller being journaled on the trolley fulcrum pin 20 swings "with the upper limb of the fulcrum heel 23, 23 and shifts toward and from the arm 26 which is fixed to the crank pin "21 and which is moved forward by said roller to turn the crank pin to force the crank arm down when; the trolley pole flies up-from thewire and slides forwardly endwise, under the recoil of the springs.

. 28, 52s designate a bifurcated latch iv- I oted to the trolley foot at 29 and normally held in latching position by a spring 30. j

which engages underneath the bar 31 of, a the latch. The latch 28 and 28 corresponding to the heel ,is made in two duplicate parts shown clearly injFigs. 2 and 3 and said parts extend under the lower tips of the heel 23, '23 as seen in Fig. 1.11. From the nature of-the view in Fig. 10 theheel pieces are not in thatview clearly shown as being distinct from the latches which they partly cover as the parts are superposed in such a manner that-full illustration of the same' by dotted lines in this view is not practical. of the latch 28 and 28 are notched at their freeIends to normally hold the tips of the heel-23,23 and to release said heel when the latchis depressed by the means'hereinafter described. Theheel composed of said two parts 23, 23 is thus pivoted to turn on the heel journal 19; and the trolley ful The duplicate. parts crum pin 20 is thus pivotally mounted I through the medium" of the heel 23,23 upon theheel journal 19 that is carried by. the standards 14 and 14:; and when the heel is unlatched said fulcrum pin may move forward and back on an are described from said journal 19 and carries the trolley poleforward and back with'it. The spring 7 ,30'is a leaf spring bolted to the, base'and extending between the lower tips of the heel-and between the members 28, 28 of the latch. The tension of the spring is upward on the bar 31, which is rigid with the two members 28,28: of the latch. When the heel is latched the trolley-fulcrum 20 is held retracted from the arm26.

32, 32' designate the trolley springswhic'h are attachedto the free ends of the cranks 27 27 and to lugs33, 33' on the trolley-pole socket-piece 310 f which the shank 24: is'a part, and which socket-piece carries the trolley-pole 3. The tendency of the springs 32-, 32v is to-drawthe trolley-pole to upright position, and also to draw the arm26 against the roller 25 so long as the fulcrum 20'is held'retracted bythe latched heel This, will be understood by reference to Figs. 15 and 16. 1

- By reference to Figs. 10, 15, 16 and 1 7 it will be seen that when the heel 23 is unlatched, thus allowing the force of the spring 32 and the weight of the trolley-pole 3 to shift thefulcrum 20 forward alongthe,

slot 16, the roller 25 will force the arm 26 forward, thus forcing the-cranks 27,27 downward, therebyshifting the lower end of the spring'32 and bringing it almost in line with the axis of fulcrum 20, thereby greatly reducing the leverage of the spring 32 so that its tendency to lift the trolley-pole is less when the heel is unlatched and the fulcrum advanced as Fig. 17 than when the heel islatched and the fulcrum'retracted as inFigs12 and15. Y

35 designates" a'latch-r'eleaser adapted to be operable by a sudden upward movement of the trolley-pole such as will occur when the trolley-wheel accidentally leaves the trolley-wire 5. Various contrivances for effecting such release of the latch may be provided. For this purpose 36, in a general way, designates a liquid-container, and 37 a mobile body of liquid therein. Glycerin is a suitable liquid for such body. The-purpose. of the mobile body is to allow any amount of normal up-and-down movement of the trolley-wheel to occur without afiecting the latch-releaser 35, but to cause the latch-releaser to operate to release the latch immediately thefmovement of the trolleywheel in response to the springs 32, 32 is unrestrained. The liquid body and the related elements constitute rate-gaged-means whereby the excessively speedy movement of the trolley-pole is caused to release the same. A distinctive and basic feature of this invention resides in the provision therein of means by Which the trolley springs will upon a sudden upward movement of the trolley pole within the working range of such pole automaticallyact to start the upper end of the trolley pole to swing downward.v Heretofore the downward movement of the pole has only been effected by me.- chanical engagement of parts which cannot engage until the pole has reached a determined point in its upward movement, while with this invention 1 interpose means which operate by reason of any sudden movement of the trolley pole instead of, by engagement of moving parts after, the trolley pole has reached a determined point in its upward movement. In the drawings I have shown the best means by which I contemplate effecting this operation, but it is evident that the invention is not to be limited to the spe cific means for this purpose which I have herein incorporated as a part of the novel apparatus.

38 designates a flexible diaphragm operable by said body, 37. The same may be a sheet of leather or other suitable flexible material fixed between the trolle -foot 10 and an open-ended cylinder 39 that forms a part of said container and is fixed to the trolleyfoot by means of bolts 40. The latch-releaser 35 may be mounted in a chamber 41 in the trolley-foot, and is movable up and down to force the'diaphragm 38 upward against the mobile body 37, and in turn to be forced downward thereby.

A piston 42 having bypass ways. 43 controlled by a valve 44 is provided in the container 36, and adapted to move freely therein toward and from the diaphragm 38 when the bypass ways 43 are open. The valve 44 is arranged to normally leave the bypass ways 43 open, said valvebeing arrangedto fall away from thefpiston' 42 by gravity, and also being provided with a spring 45 to as'-' sist such movement, thus normally leaving the ways 43 open so that the piston 'Inay move up and down in the container 36. The valve is so arranged below the bypass ways 43 that upon a sudden downward movement of thepiston 42 the liquid body 37 will hold the valve 44 until the piston reaches it, thereby suddenly closing the bypass ways 43, whereupon any force applied to further move the piston toward the diaphragm 38 will force said diaphragm downward to move the latch-releaser '35 downward, thus to release the latch 28 from latching position and allow the lower portions of the heel pieces 23 which have been held by said latch, to move backward. This-allows the upper portion of the heels to move forward in response to the tension of the springs 32, 32. The piston 42 is connected with the trolley-poleabove the heel-pin 20 through a piston-rod 46 loosely pivoted to a' lever 47 that is fulcruined on the journal 22 and is provided at one end with a slot 48 to accommodate a pivot 49 of the piston-rod 46; said lever being pivotally and loosely connected by links50, 50 with the shank of the trolley-pole.

51 designates the pivot-between the links 50 50 and the lever 47 and 52 designates the pin betweenthe links and the trolleypole shank-piece 24 that forms part of the shank of the trolley-pole and is set in theend of socket-piece 34. The pin 52 is fixed to said shank-piece 24 and plays in a slot 53 in. the links. 54 is a spring engaging a bar 55 which is rigidly connected with both of said links. Said spring tends. to force the links toward the trolley pole shank and to operate the lever '47 toresiliently retract the piston 42.

In Fig. 12 the parts are shown in solid lines in the positions occupied after the force from the upward thrust of the trolley-pole has been transmitted through the pins and links 51, 52 and 50', the lever 47, thence through piston-rod 46, liquid body 37, diaphragm 38, and latch-releaser 35 to the latch 28 which has thereby been forced downward from the trolley-heel 23, thus releasingthe same, and the tro1ley-fulcrum or heel-pin 20 has moved from the dotted position (Z at one end of the slot '16 downward and forward to the position shown in solid lines, and the roller 25 has been'forced downward and for ward, thusmoving the arm 26 forward from the' dotted position (Z, and bringing the spring '32 close to the axis of the fulcrum so that the leverageof the spring to lift the pole has been reduced from what existed while the trolley-heel'was latched. When ever the trolley-pole-fulcrum 2O and the roller thereon shift forward relative to the ]Oll1l1itlS 21 and 19 which are stationary,

the roller 25 acts upon the arm 26 of the spring-crankshaft'21 and shifts the cranks 27 27 to shift the draft-line of the springs position andthus allowing the spring ten- 'sion arm 26 to travel backward, thereby allowing the pins of the spring-cranks 27 2'7 to stand off center and above the fulcrum of the trolley pole, so that the draft of the springs '32 is above the fulcrum and is operative to draw the trolley-pole upward.

In case the trolley-wheel escapes from the trolley-wire the springs 32 rapidly draw the trolley-pole upward, thus causing the pin 52 tomove upward and forward in an are from position 0 to a position a, therebysuddenly forcing the lever 47 into the position (i, and the piston 42 down upon the check-valve 1a, thereby driving the liquid 37, the diaphragm 38, spring-releaser 35, and the latch 28 downward, thus releasing the tip of the heel 23. During this time the weight of the trolley-pole and theforce of the springs are effective to shift the fulcrum from position (Z to 6, thereby forcing forward the "crankarm 26, thereby turning the crank-shaft on its axis and forcing the cranks 27, 27, downward, thus bringing the draft line of the springs nearly in line with the trolley-fill crum so as to reducethe upward pull on the pole and direct theforce to move the pole endwise rather than upward, and to tilt the fulcrum-carrying portions of the heel forward over the journal 19, thereby continuing'to move the crank-arm 26 forward and the cranks 27, 27 downward into line, or nearly so, with the fulcrum, so that the force of the springs 32 to lift the trolley-pole is greatly reduced and becomes insufiicientto sustain the weight of the trolley-pole; Since the trolley-heel is now fully-released, said heel turns on the fulcrum formed by the pin 20 and allows the pole to descend. During the forward endwise movement of the trolley pole caused by the recoil of the springs the operation relative to thelever 47 after.

the trolley pole is released by escape 'ofthe trolley wheel fromfthe wire, is as follows At first the lever 47- moves sulficientlyato force the piston rod- 16down untilthe heel 23, 23 is unlatched; and, the valve tebeing closed, the piston rod46is held against further downward movementg'thus holding the lever 47 rigidlyagainst the u ward; endwise,

thrust of the link 50 so that assaid link '50,

swin'gs forward-the pin 52, by which the link 50 ispivoted tothe trolley pole 24,;mu st descend. Thepin 2O necessarily moves in I an arcof a circle whose centeris the journal 19;. and hence a limitation of its movement aside from moving in. the arc is impossible.

- I t hgs eleases heel 23 the trolley pole'is actedupon by the springs-32 operating from pin 21' and the pole isfree to move about the fixed point or axis' formed by j ournal 19, andthe now fixedpivot point 51, and 111 the movement of the pole thepin 20mm the pin 52 on the polemnstmove in arcs of circles about these fixed points '20 and 51,

the radiijbeingthe upper part of heel 23 betweenpin19' and pin2O and the'links be? I tween pin 52 and pivot 51 and"the distance between pin 20 and pin 52 must of course always be the'same' 'Underthese conditions although both points on pole 20'and 52 move forwardly and downwardly the pole 3 eX-f tended rearwardlythrough these points will describe at its end a downward as well as: a

forward movement. Assoon as the link 50 ha's'cometo the position 6 shown'in dotted lines in Fig. 16 and in solid lines inFig. 17 the pole may move on to the position shown in'Fig. 18.

It is'to be understood that thisspecifi-f cationthe movement-pf the trolley pole on its horizontal pivot is spoken of as the up ward and downward movement of the trolley pole, meaning the effectual movement oftheupper or main part of the pole above the horizontal pivot. I The trolley- heels 23, 23. are each provided withashoulder 58 beneath the trolley-pole shank-'24 which is forked to "embrace the trolley-heels and to come to: rest thereon when the trolley-pole has descended to the resting position'a. t

Refer now to Fig. 18.-. When the trolleyshank 24tengages the shoulders 58- of the trolley-heel, it thereby tends to swing the trolley-fulcrum 2O backward, which, can

only be done by stretching the spring 32. The momentum of the trolley-pole is insufficient to thus stretch the spring, and

therefore the trolley pole is held in the resting position a. until -a'dditional force is exerted, as by the conductor orother attendant, thr0ugh'thetrolley roper to pull the trolley down into the position b shown in solid lines' in 'Fig. 11. The movement thus eif'ectedby pullingdown thepole from resting'positionto resetting position, Fig. 19,

can be traced in said Fig. ll-bymeans of the broken lines. Referring nowito Figs.

18a'nd '19,- when forcelis applied through the trolley- 1 rope r to pull? the trolley "wheel 4: down the" trolley pole operates the 1 lever .47 to raise the piston, and at the. samestime forces" the shoulder 58 downward and conse' quentl thra heel" 23 forward 'allowing'tli I, I

spring 30 to lift the latch 28 and thereby latching the heel. At the same time the ful-.

crum pin and the roller move rearwardly. The rearward movement of the fulcrum and roller allows the crank-arm 26' 4 passed into the notches of the latch. The

downward movement of the shoulders 58 shifts the tip of the heels 23, 23 into latching position, thereby giving a purchase for the heel so that a lthe trolley-rope is paid out the trolley-pole will travel upward, the trolley-fulcrum having been given a fixed support. As the ends of the cranks 27, 27 rise above the fulcrum,.the effect of the spring to lift the trolley-pole is increased without increased tension of the spring after the setting operation has been performed by the attendant. V i

56 and 57 are buffers .of rubber or other suitable material; the buffer 56 being annjular and located in the chamber ll to receive the latch-releaser 35 which is flanged to rest on said buffer to relieve the shock' resulting from'the sudden closing of the by-pass 43. Said buffer 56 operates through flanged latch-releaser. 35, the diaphragm 8 8, the liquid body 37, the valve-piston 42, pistonrod 46, lever 47, and links 50,-to stop the sudden upward travel of the trolleypole, and, by reason of its resiliency, to assist somewhat in returning the pole from its uppermost position. The bufier 57 is a rubber block located on the base underneath the dog-arm 62 to be engaged by said dog-arm when the same is forced down by the crank arm 26. Y

In order to prevent the trolley pole from swinging greatly to one side or the other, after the trolley wheel becomes free from the trolley wire two pairs of stops in the form of studs 59 areprovided,one pairat the front and the otherat the back of the trolley base 6, and 'a dog 60 is pivoted. to the trolley foot 10 and is arranged to project into'position.

between a rearward pair ofsaid. studs 59, which project upwardly from the base to restrict 'the rotation ofthe trolley foot within certain limits. It is desirable however. that the trolley polebe free to swing at all times, except when uncontrolledyfeither by the trolley wire, or by the trolley rope. To efiect'this resultthe dog 60 is pivoted on the heel journal '19 and is provided with three arms, 61, 62, 63. The arm 61 is adapted to 59. The arm 62 is adapted to be depressed by the-crank arm 26 when the same is forced forward by the trolley pole, thereby to lift the'arm 61 into the dotted position shown in Fig. 11, and the solid position shown in Fig.

12, ready to engage one or the other of the studs 59 as the trolley foot rotates in one or the other direction. The arm 63 is adapted and arranged to be engaged by the crank arm 26 when the trolley is in the working position 0. Since the trolley pole moves into the forward position 6 almost instantly after the trolley wheel leaves the trolley wire, it is apparent that the crank arm 26 thu immediately throws the dog 60 into the stop engaging position, and as the trolley pole remains in the forward position, thus holding the crank arm 26 from that time until the trolleypole has been depressed to the setting position, it is evident that the dog 60 will remain in stop engaging position approximately from the time the trolley wheel has escaped from the wire, until it is under the control of the trolley rope. \Vhen the trolley isreversed the other pair of studs will stop the dog. Whenever the crank arm 26 operates to force the dog arm 62 downward said dog arm comes to rest on the rubber buffer 57, thus preventing jars. When the trolley pole is drawn down into the resetting position 1) thereby retracting the trolley pole into the position shown in solid lines, Fig. 11, the arm 26 is thus left free to move rearwardly when the draft line of the springs comes into position to swing the sufliciently to allow the draft line of the I springs to come above the trolley fulcrum, then the crank arm 26 becomes retracted into the position 0, seen in broken lines Fig. 11. hen the crank arm engages the dog arm 63 it holds the same rearwardly thus to hold the arm 61 down out of stop engaging position, thus to leave the trolley foot free to rotate on its vertical axis until the crank arm is again shifted by tripping of the pole, or

by such lowering of the same as will release the dog 60.

I claim: i 1. A retrieving trolley'comprising a trol ley pole, springs normally in commission to enter andflwithdraw'from betweenithejstuds 1A pivoted, heel, a latch; to hold said heel, a pole fulcrumed on said heel, a spring arranged to raise the pole, means operable by the shifting fulcrum to change the draft line of the spring to reduce its lifting effect on the pole, and means to release the latch to allow said heel to shift, thereby to shift the fulcrum and change the draft line of the spring.

8. A rotatable foot, a pivotally mounted trolley pole carried thereby, means to restrict the rotation of the foot, means to swing the pole upward, a latch to retain said pole-swinging means and pole in polesupporting position relative to each other, and means operable by rapid movement of the pole to release said latch and to move the restricting means into commission.

4. A trolley pole mounted to swin on a vertical axis and also on a horizonta axis,

means for swinging said pole on the horizontal axis into operative position, and means operable by the movement of the pole to automatically lock the pole against swinging on the vertical axis when the pole is out of operative position.

5. A pivoted trolley-foot provided with two upwardly-projecting standards, a trolleypole pivotally connected with said standards, a dog pivoted to the standards, stops, and means operable by the trolle -pole to move the dog into position to engage the stops when the trolley-pole is unrestrained.

6. A trolley-pole, a shiftable fulcrum on which the trolley pole is pivoted, an arm operable by the trolley pole, a crank in fixed relation to such arm, and a spring connecting the pole with the crank to liftthe pole and movable by the crank toward and from the fulcrum to decrease and increase the lifting effect of the spring on the pole.

7. A pole, a shiftable fulcrum therefor, means to hold the fulcrum stationary, a releaser therefor, a liquid body to operate the releaser, a piston provided with a valved bypass to move the liquid body, and means for transmitting power from the pole to the piston to cause the liquid to operate the releaser at a rapid movement of the piston.

8. The combination of a pivoted heel, a trolley-pole fulcrumed thereon, a crank, an

arm in fixed relation to the crank and! operable by the movement of the fulcrum, a spring connecting the pole and crank, a latch for the heel to hold the same in position with the spring in osition to exert a definite lifting force on t e pole, a releaser for the latch, a confined body of liquid arranged to operate the, releaser,a valved piston adapted to cause the liquid to operate the releaser when the piston moves toward the releaser at a definitespeed, means to transmit motion from the trolley-pole to the piston to cause the releaser to release the latch and thereby allow the heel to turn to shift the crank to reduce the lifting force of the spring.

9. The combination with a trolley-pole, a spring therefor and means to shift the spring to increase and decrease its lifting force, of a confined body of liquid to set into operation the spring-shifting means, a piston to actuate the body, a lever to operate the piston, a slotted link to operate the lever, a pin in the slot and operable by the trolleypo e to move the lever in one direction, and a spring carried by the pole to move the lever in the. other direction. I

10. The combination with a pivoted heel,

of a spring, a latch to engage the heel to hold the heel in pole-supporting position, a trolley pole pivotally mounted on the heel and adapted and arranged to be supported by the heel and springwhen the heel is latched, and to engage the heel to bring the same to latching position, and means oper-,

able by rapid movement of the pole while the pole is within its normal range, to release the latch.

11. The combination with the trolley-base provided with a stop, of a trolley-foot rotatable thereon, a dog on the foot to engage the stop to lockthe foot relative to the base, apole fulcrumed on the foot, means to hold the pole in working position, and means operable by the pole to hold the dog out of locking position when the pole is in working position, and to hold the dog in locking position when the pole is unrestrained.

12. A base provided with a stop, a rotatable trolley-foot on the base, a dog on the trolley foot provided with three arms, one of which is adapted to engage the stop to lock the foot against rotation, a trolley-pole, and means operably connected therewith to act Y upon the other arms to move the dog into and out of lockingposition.

In testimony whereof, I have hereunto set my hand at Oakland, California, this 13th day of June, 1908.

In presence of- JEssE L. DIBERT, FRA K A. WASSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. I

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