US1533106A - Door-shoe construction - Google Patents

Description

April 14, 1925.

P. R. FORMAN noon snoz cons'mucnou Filed Dec. 9,1922

u|llllllllnllllllllllllIll III auoentoz Patented Apr. 14, 1925.;

UNITED," STATES PATENT OFFICE".

PARIS R. FORMAN, OF RAHWAY, NEW JERSEY, ASSIGNOB COMPANY OF NEW- YORK, N. Y., A CORPORATION TO NATIONAL PNE MA IC or WEST VIRGINIA.

nooneseon CONSTRUCTION;

Application filed December 1922. Seria1-1 l'o. 606,'009;

type of doorshoe constructions as is employed in the street railway art where the d'oor shoe iscarried at the front edge ofthe door so-that if in; closing the door encounters'an obstruct-ion the door shoe comes in contact with the obstruction and as a result thereof controls the door motor to accomplish one of a number of operations.

It is the general practiceto employ the collapsingof the door shoe, or, to be more exact, the contacting of the door shoe with an obstruction to control an electric circuit which in turn controls the door motor whereby, upon actuation, the doormotor is reversed to causethe doorto move towards the door open position .and thereby allow the obstruction to beremoved.

The particular object of the invention is to provide a door shoe construction which,

is simple in structure, efficient in operation and economical in manufacture.

A further andmorespe'cifio obiect ofthe invention is to provide a door shoe which renders the safety feature or control effec- V tive throughout the entire length thereof.

' A further object of the invention is to provide a construction: of mounting for the l'owere'dge of the door shoe which renders the lower edge thereof as sensitive as any other'portion throughout the length thereof. Further objects of the invention will appear more fully hereinafter. v

The invention consists substantially in the construction, combination, l'ocation'and rela-' tive arrangement of parts, all as will be more fully hereinafter'set forth as shown by the accompanaying drawing and finally pointed out in the appended claims.

Referring to the drawing-2 Figure 1 is a view in elevation partly diagrammatio and partly? broken away show ing a doorwith a door shoe construction of."

my invention applied thereto. I

Fig. 2 is an enlarged detail view partly in section and partly broken away of; the lower end of the door showing the support of the door shoe.

Fig. 3 is a similar view showing the up per end of the door shoe andi the support means therefor. l

The same part isRdeSigua-ted by the same reference character wherever it occurs throughout the several views- It is customary in thestreet carart teem ploy at the front edge of the door," sueh;as.a sliding door 1, what is generally designated as a shoe and which is illustrated at 2'.

The shoe consists, in this instance, of'a. coil of wire 3 extending substantially theheight of the door. This coil of wire is: connected by means of alconductor 4 to a shoe 5 which travels with the door, which shoe 5 travels on a conducting track ,6 Extending through the center of the coilof wire: 3' and normally out of contact therewith is a wire 7 which wire is connected by, the wire 8 with a shoe 9 carried by the doorfwhich shoe travels over the conducting track 10. The wires 3 and 7 are coveredgenerally with rubber, canvas or other material 2, and it will be apparent'that if the shoe comes in contact with an obstruction during theclosiing movement of the door. the wires 3 and 7, as a result thereof, will be plaoedincon tact with each other, thereby establishing circuit connection between the conducting tracks 10 and 6, the establishment of which circuit is utilized in a manner well understood in the art to effect the safety controhof the door operatingfmotor, which features form no'partof my present invention.

The top of the shoe 2 issupported by a bracket 15 which is suitably secured tothe front edge of the door 1 (see Fig. 3') ,a-nd' the insulating bushing 16 is employed for sup-' porting the end of the wire 7 the saidbuslr ing likewise being supported by thebracket 15'; In door shoe structures of'this natureit will readily be apparent thatasupoort for the lower edge of the shoe of'similar; con struetion to that illustrated-for" tlie'topof the shoe, would render the intermediate desirable that the shoe structure be sensitive substantiallyv throughout its height and es pecially at'th'e bottom thereof, and my present invention is directed to supplying an efficient means for effecting a sensitive control of the bottom portion of the shoe. 7

In the form shown I providea bracket pivotally mounted at one end to the front edge of the door at a point between the top and bottom thereof, the free edge of the bracket forming a support andattachment for the lower end of the shoe 2, the middle wire 7 being insulated from the coil 3 by means of a suitable insulating bushing 16, as hereinbefore described.

Secured erably by a pivotal connection 21, is anarm of insulating material provided'with a conducting portion 22. When the shoe is in its fully extended position the parts are in the position shown in Figs. 1 and 2. When, however, the lower portion of the shoe comes in contact with anobstruction, the lower ducting WIIGS' portion of the shoe structure is moved around the pivot 23 of the arm or bracket 20 so .that the conducting portion 22 of the lever or arm carried thereby is moved so as to establish the circuit connection between the conducting fingers 245 and 25 which contact fingers are electrically connected to the con t and 8, as above illustrated. It will readily be apparent from the foregoing that I have thus provided means for ensuring a proper completion of the circuit between the contact rails 6 and 10, irrespective of where the shoe encounters an obstruct-ion up to the approximate top of the door itself, and that the means provided are not in substitution to the noiinal control effected by the wires of the shoe itself, but are in addition thereto, whereby either or both become effective.

' The shoe may maintained in its normal eX tended position by any one of 'a number of means which will readily suggest themselves to those 'skilled'in the'art. By the arrangement in Fig. 2 I show one exceedingly simple arrangement wherein a spr ng 27 is employed which serves for this purpose.

Many modifications and changes in details will readily occur to those skilled in the art without departing-from the spirit and scope. of my invention as defined in the claims, but having now set forth the objects and nature of my invention, and having shown anddescribed a construction embody ing the principles thereof, what 1 claim as power operated to the pivoted arm 20 and pref new and useful and of my own invention,

and'desir-e to secure by Letters Patent is:

1. p In a safety shoe cont-act device for power" by said first mentioned means.

2. In a safety shoe contact device for power operated doors, the combination with anelectric circuit, of means carried by the front edge of said door for controlling said circuit, comprising a suspended coil' spring" and a wire located longitudinally therein, saidwire and spring comprising terminals of said circuit, and means for controlling said circuit independently of said wire and spring upon movement thereof bodily relative to said door. 1

3. In a safety shoe contact device for doors, the combination with an electric circuit, of means carried by the front edge of said door for controlling said circuit, compri 'ng a suspended coil spring and a wire located longitudinally therein, Q

said wire and spring comprising term nals of said circuit, a movable support for the lower end of said spring and wire, and

means for controlling said circuit by the movement of said support.-

'4. In a safety shoe contact device for power operated doors, the combination with an electric circuit, of means carried by the front edge of said door for controlling said circuit, comprising a suspended coil spring and a wire located longitudinally therein, said wire and spring comprising terminals of said circuit, a support for the lower end of said spring and wire, mounted upon for movement relative tosaid door, and means for controlling said circuit by the movementof said support. I g r 5. In a safety shoe contact device for power operated doors, the combination with an electric circuit, of means carried by the front edge of saiddoorforcontrolling said circuit, comprising a suspended coil spring anda wire located longitudinally therein, said wire and spring comprising terminals of said circuit, a support for the lower end;

of said spring and wire, mounted upon for movement relative to said door, an arm carried'by saidsupport, andterminalsffor said, circuit controlled by said-arm whereby said circuit isclosed when said arm -ismoved towards said door.

6. In a safety shoe contact device for power operated doors, the combination with an electric circuit, of means carried by the front edge of said door for controlling said circuit, comprising a suspended coil spring and a wire located longitudinally therein,

said wire andspring comprising terminals of said circuit, a support for the lower end maintaining said arm and support extended of said spring and Wire, mounted upon for from sald door.

movement relative to said door, an arm can In testimony whereof I have hereunto set 10 ried by said support, terminals for said cir-- my hand on this fifth day of December cuit controlled by said 'arm whereby said A. 1)., 1922.

circuit is closed When said arm is moved towards said door, and means for normally 1 PARIS R. FORMAN.

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