illustrated in fig1 is a mail box 10 embodying the present invention . the mail box 10 comprises a receptacle 11 in which mail is deposited by a mail carrier . in the exemplary embodiment , the receptacle 11 is of sheet metal construction and has the usual side wall formed of a single sheet of metal rolled or bent in the usual manner to form the sides and curved top . a rear wall closes the rear of the receptacle 11 and a bottom wall joins the side walls and the rear to complete the enclosure of the receptacle , except for the front opening . a door 15 of appropriate shape to close the front opening is mounted to the front of the box by a pivot hinge 16 located along the lower edge thereof . the door 15 pivots along the lower edge thereof to be swung into an upright position to close the receptacle 11 or swung down to a horizontal position to open the receptacle 11 . a suitable latch 17 normally holds the door 15 in the upright position to close the receptacle 11 . the door 15 is opened manually against the urgency of the latch 17 . according to the present invention , fixed to the door 15 for movement therewith is an integrally formed substantially z - shaped mounting bracket 20 for a signaling attachment 18 . the substantially z - shaped mounting bracket 20 includes a portion 21 that is secured at one end thereof to the door 15 for movement therewith by suitable means , such as screws or an adhesive . at right angles to the other end of the portion 21 is one end of an extension portion 22 . at right angles to the other end of the extension portion 22 is a pivot support portion 24 . the pivot support portion 24 is oppositely directed with respect to the portion 21 . intermediate the ends of the extension portion 22 and joined at right angles thereto is a right angular or l - shaped stop portion 23 . the free end of the stop portion 23 is directed in the same direction as is directed the pivot support portion 24 from the extension portion 22 , and it is parallel to the pivot support portion 24 . however , it is spaced therefrom by a distance of a portion of the length of the extension portion 22 and additionally by a distance of the length of the member of the stop portion 23 joined to the extension portion 22 . a hollow signal or flag arm 25 is pivotally mounted on and freely supported for pivotal movement by the pivot support portion 24 of the bracket 20 intermediate the ends of the signal arm 25 . a suitable cap nut 26 and the junction between the pivot support portion 24 and the extension portion 22 limit the radial movement of the signal arm 25 on the pivot support portion 24 . one end of the hollow signal arm 25 is closed by a suitable cap 27 . at the other end thereof , the hollow signal arm 25 carries a suitable signal device 30 , such as a sphere or a flag , for movement therewith . contained in the hollow signal arm 25 on each side of the pivot support portion 24 is a suitable weight , such as weights 31 and 32 . in the preferred embodiment , the hollow signal arm 25 is tubular in construction and the weights 31 and 32 are freely movable solid metal spheres . in the exemplary embodiment , there is a solid metal sphere on each side of the pivot support portion 24 . however , liquid weights may be employed in lieu thereof . initially ( fig2 ), the door 15 is closed . the extension portion 22 of the bracket 20 is substantially horizontal . the hollow signal arm 25 is inclined axially in the direction from the signal device 30 to the cap 27 . at this time , the weight 31 is at the signal end of the hollow signal arm 25 and the weight 32 is at the pivot support portion of the bracket 20 . the cap end of the hollow signal arm 25 is disposed below and engages the l - shaped stop portion 23 of the bracket 20 . since the weight 31 tends to urge the signal arm 25 to pivot in the counterclockwise direction , as viewed in fig1 the stop portion 23 of the bracket 20 limits the movement of the hollow signal arm 25 in the counterclockwise direction . the weight 31 exerts at this time a greater turning movement than does the weight 32 . when an operator opens the door 15 ( fig3 ) to the fully extended , substantially horizontal position , the door 15 pivots about the pivot hinge 16 along the lower edge of the door 15 . this action through the bracket 20 gradually changes the position of the hollow signal arm 25 from the aforementioned inclined position to a horizontal position . as the pivotal movement of the door 15 about the pivot hinge 16 is continued to the substantially horizontal position , the hollow flag arm 25 starts to decline in the direction of the signal device 30 to the cap 27 . once the hollow signal arm 25 begins the aforesaid decline , the stop portion 23 of the bracket 20 no longer serves as a stop . the hollow signal arm 25 is now pivoting in the clockwise direction , as viewed in fig1 under the urgency of the weight 32 . the weights 31 and 32 start to shift positions in the hollow signal arm 25 and gravitate as the aforesaid decline takes place . the shifting of position of the weight 32 causes the hollow signal arm 25 to move clockwise and to assume the upright position with the signal device 30 at the elevated position . at this time , the weight 32 exerts a greater turning movement than the weight 31 and also the weight 32 dominates the weight 31 in maintaining the signal arm 25 in the upright position . the shifting of the position of the weights 31 and 32 brings the weight 31 to the pivot support portion 24 and brings the weight 32 to the cap end of the hollow signal arm 25 . at this time , the operator places the mail in the receptacle 11 and closes the door 15 ( fig3 ). during the closure of the door 15 and while the door 15 is closed , the hollow flag arm 25 is maintained in the upright position by the weight 32 . after mail is removed from the receptacle 11 , the hollow signal arm 25 is manually reset to its initial position ( fig1 ).
a mail box with a signal attachment in which the opening of the door causes a bracket to activate a pivotally mounted hollow signal arm . the activation of the hollow signal arm moves the hollow signal arm into a substantially upright position . weight means within the hollow signal arm urges the hollow signal arm into a substantially upright position and maintains the hollow signal arm in the upright position until an operator manually resets the hollow signal arm to its initial position .