Year: 1897

page_text: DONALD BLACK, Engineer, at present residing at No. 2 Ross Road, Howrah, in
British India do hereby declare the nature of this invention and in what manner the
same is to be performed to be particularly described and ascertained in and by the
following statement :—
2. In all the hinges now in the market, one of the serious drawbacks noticeable
is that they do not admit of the doors to which they are attached returning to their
normal position when pushed open, the result being that the doors remain ajar and
privacy is lost.
Many attempts have been made to overcome this disadvantage, but in vain-only
partial success has attended the means which have been devised.
3. By the hinge invented now this much desired end has been accomplished, and
as the hinge also possesses the advantage of simplicity of construction, cheapness of
manufacture, and durability, it is felt that a much felt want has been supplied.
4. The doors hung by means of this improved hinge will swing freely forwards and
backwards and immediately revert automatically to their closed position.
5. The hinge is formed in two parts consisting of a pin and a socket working one
into the other, the former being attached to the door, and the latter to the frame, or
vice versa. The essence of the invention lies in its peculiarity of construction which
enables the doors on being pushed open to swing back by their own weight to their
normal position. The means invented for attaining this object consist in forming
the two parts of the hinge with elliptical bevels or inclines corresponding to each
other so that the door on being pushed open from either side rises by means of this
elliptical bevel or incline and comes back to its closed position the moment it is
released.
6. These hinges are intended for attachment to the lower portion] of doors; the
upper portion may be hinged by any convenient arrangement such as is shewn in
Figs. 1 & 2 in Sheet I, and Figs. 1 and 2 in Sheet II of the drawings hereto
attached, the novel features of the hinge are also clearly delineated in these drawings.
In Sheet I, Fig. 3 shews the hinge when the door is open, Fig. 4 when the door is
closed. Referring to the figures, A is the pin which works in the socket B by means
of the elliptical incline C.
7. It will be seen that the construction of the hinge is very simple, having no parts
that can get out of order, and that it will therefore prove almost everlasting.
8. For heavy doors which are not capable of rising and falling the same as the
swing doors, springs are provided in the manner shewn in Figs. 3 & 4 of Sheet II
of the drawings in which A' are the Springs placed spirally above the Elliptical
action B¹ of the hinge and shewn working in a receptacle C¹ provided for them by
means of a second socket and pin D' with which the hinge for heavy doors is con-
structed. These springs act in place of the weight of the doors and do away with
the necessity for their rise and fall, As shown in Figs. 3A & 4* of Sheet 2 of the

page_text: Drawings the pin D' is prevented from revolving in the Socket C¹. The hinge may
be made of either iron, brass, or any other suitable material.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. The construction or manufacture of a door hinge consisting of a pin and socket
and having elliptical bevels or inclines substantially as described and illustrated.
2. The construction or manufacture of a door hinge as in the first claim but
provided with a spiral spring substantially as and for the purpose set forth.
3. As a new article of manufacture, the door hinge with or without the spiral springs
substantially as described and illustrated.