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Publication numberUS575770 A
Publication typeGrant
Publication dateJan 26, 1897
Filing dateMar 25, 1896
Publication numberUS 575770 A, US 575770A, US-A-575770, US575770 A, US575770A
InventorsWilliam J. Sumner
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
William j
US 575770 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)


TROLLEY TRACK FROG- No. 575,770. Patented Jan. 26,, 1897.





SPECIFICATION forming part of Letters Patent No. 575,770. dated January 26, 1897.

Application filed a ch 25, 1896. Serial No. 584,782. (No model.)

To all whom it may concern which runways is a longitudinal slot in which Be it known that 1, WILLIAM J. SUMNER, a the hanger to which trolley-wheels are hung citizen of theUnited States of America, residmoves in the usual manner. Each of said ingatI-Iolyoke, in the county of Hampden and arms A of the frog is formed to receive the 55 State of Massachusetts, have invented new several converging ends, in this instance, of and useful Improvements in Trolley-Track trolley-tracks of the above-described form, Frogs, of which the following is a specificaand the under side of each of said arms has tion. a slot C therein which is continuous from the This invention relates to trolley-track frogs, end of each arm of the frog to the extremity 60 the object being to provide an improved conof the under side of the arm ofthe frog on struetion of such frogs forsupporting the ends the opposite side thereof, as shown in Fig. 3. of several lines of converging trolley-tracks Consequently when the ends of four trolleyand providing forthe proper movement of tracks B are entered within the four arms A trolleys and their hangers from one track onto of the frog the inner ends of said tracks 00- 65 another at the intersecting point of different copy the positions relative Lo the central inlines of track; and the invention consists in tersecting point 5 of the frog shown in Fig. a peculiar construction and arrangement of 3. C C C C indicate the hanger-slots of each said frog whereby it provides a support for of said four arms and also the said longisaid several ends of trolley-track and means tudinal slots in said trolley-track B. The 70 I for supporting said frog in position for use runways 6 of the latter extend along the opwith overhead track-lines, all hereinafter posite borders of said slots coincidently with fully described,an d more particularly pointed the portions of the arms A themselves, on the out in the claims. opposite borders of said slots.

In the drawings forming part ofthis speci- Referring to Fig. 3, the four lines 8 there 75 fication, Figures 1 and 3 are respectively side shown indicate the terminating-points of the and plan views of trolley-track frogs of box inner ends of the four trolley-tracks B, conform embodying my improvements, the secnected to the frog as aforesaid, and the several tional portion of Fig. 3 being on line 3 3, Fig. numerals 9 there shown indicate sections of 1. Fig. 2 is a sectional view of the lower part trolley-wheel runways corresponding in form 80 of the frog on line 2 2, Fig. 1. to the said runways (5 in said trolley-track B, In the drawings, A indicates four boxwhich extend in the base of the frog between shaped or hollow extendingfromthecenthe ends of the several tracks B, which are tral portion of the frog construction, the united in the frog, to the end that the wheels openings in said arms extending from the eX- of a trolley carrier or hanger, approaching 85 tremity of one thereof at one side of the frog the center 5 of the frog from one direction, in a straight line to the extremity of the arm will enter and follow the said depressions or A on the opposite side of the frog. Thus the runways 9 at or about said lines 8 and immetwo lines of track-openingsextending at right diately reenter the end of the trolley-track angles to each other in the frog have a comin the opposite arm of the frog. In practice 90 mon intersecting point at 5, Fig. 3. The form the separation of the ends of said track B of the track-openings in said arms Amay be from each other in the frog is inconsiderable such as to receive any desired form of trolleyand the passage of the trolley-wheels from track. In the present instance, however, the end of one track into the other across the trolley-track sections 13' are shown in conneccenter of the frog, as stated, is not attended 95 tion with the several arms of said frog. Said by any inconvenient obstacle to the movetrackB represents a well-known form of sheetment of the trolley-carrier. metal track having a top 3 and two sides l 4E The above-described trolley-track frog is at right angles to said top, and two runways provided with overhanging flanges D, one on 6 6 for the trolley-wheels, consisting of porthe end of each of said arms A, or with other 100 tions of the said sides at their lower edges suitable means for securing the frogin asusbent inwardly in circular form, between pended or overhead position. Each of said flanges D is provided with a bolt-hole, as shown, through which a sustaining-bolt may be passed in any ordinary way.

Having thus described my invention, What I claim, and desire to secure by Letters Patcut, is-- 1. A trolley-track frog made in a single casting, and havinghollowsupports or extensions extending outwardly from opposite sides to receive the ends of intersecting trolleytracks, each extension or support having a slot through its base, atrolley-Wheel runway upon each sideof the slot, and a protecting flange D upon its top, the frog being provided with a central chamber covered over at its top,

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US5511348 *Oct 8, 1991Apr 30, 1996Steelcase Inc.Furniture system
US5724778 *May 25, 1995Mar 10, 1998Steelcase Inc.Furniture system
US6134844 *Jun 24, 1997Oct 24, 2000Steelcase Inc.Method and apparatus for displaying information
US6170200Aug 27, 1999Jan 9, 2001Steelcase Development Inc.Furniture system
US6629386Sep 13, 2000Oct 7, 2003Steelcase Development CorporationFurniture system
US6922949Apr 18, 2003Aug 2, 2005Steelcase Development CorporationFurniture system
Cooperative ClassificationB65G21/22