A New or Improved Combined Door Spring and Alarum.
Year: 1888

page_text: Date of Application, 13th July, 1888
Complete Specification Left, 11th Mar., 1889-Accepted, 29th June, 1889
PROVISIONAL SPECIFICATION.
A New or Improved Combined Door Spring and Alarum.
ROBERT WILLIAMS GAMBLE of 1 Osborn Road, Woodgrange Road Forrest Gate
in the county of Essex, Warehouseman, do hereby declare the nature of this invention
to be as follows:-
This invention relates to a new or improved combined door spring and alarum the
object being to provide means which upon the opening of a door will cause a bell to
ring or gong to be struck and a spring bolt to be operated against an inclined piece
to effect the closing of the door after the same has been released.
In carrying the invention into practice a boxing containing the alarum apparatus
and the spring and bolt will be secured upon the inside face of the door (by screws
without cutting the wood work away). Upon the door jamb will be secured a plate
of metal having an inclined face against which the spring bolt of the alarum apparatus
will work the said face of the plate being at an angle to the central line of the bolt.
The outer end of this bolt is provided with a runner or it may be bevilled.
The action of the device will be such that upon opening the door the end of the
spring belt will engage with and ride upon the inclined face plate so causing the
spring bolt to be driven inwards upon the striking mechanism of the alarum.
The alarum device consists of a casing on one side of which (internally) there is
provided a bracket piece in which will be supported the spring bolt free to slide to and
fro. Between two arms of the said bracket will project a rack attached to or of a
piece with the bolt body. A further projection of one of the said bracket arms will
serve to receive a spindle, whereof the other end will find support in the metal of the
casing. This spindle carries a pinion which gears with the ratchet of the spring bolt
and also carries a lappet that acts on a striker which will in its turn, on the uicchanism
being put in motion by opening of the door, window, or casing as the case may be,
operate the hammer of the bell or gong and the alarum.
The bolt is furnished with a spiral spring so as to keep and return it to its normal
position.
The striker consists of a pivoted lever-arm to the foot of which is attached a spring.
Said lever-arm carries a second lever to one end whereof is applied a spring and the
other free end will be operated upon by the arms of the lappet. To the first lever
arm will be attached the hammer as may be convenient.
Upon the casing will be applied a sliding bolt or stop with a screw button on the
outside and a stop piece on the inside. This stop picce may be set by means of the
screw button so as to prevent the hammer reaching the bell or gong if it be desired
not to operate the alarum.
This mechanism may be applied to various hinged doors, windows, partitions, or
covers for show cases and such like purposes wherein automatic closing of the door
or cover is desirable.
The mechanism may be used as an alarum without the spring for closing the
door.
Dated this 15th July 1889
WALTER A. BARLOW,
7, St. Paul's Churchyard, E.C., Applicant's Agent_

page_text: COMPLETE SPECIFICATION.
A New or Improved Combined Door Spring and Alarum.
ROBERT WILLIAMS GAMBLE of 1, Osborn Road, Woodgrange Road Forrest Gate
in the County of Essex Warehouseman 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 :-
This invention relates to a new and improved combined door spring and alarum the
object being to provide means which upon the opening of a door will cause a Bell to
ring or gong to be struck and a spring bolt to be operated against an inclined piece
to effect the closing of the door after the same has been released.
In carrying the invention into practice a box containing the alarm apparatus and
the spring and the bolt as marked A on drawing and secured upon the inside face of
the door (by screws and without cutting the wood work away) upon the post of the
door frame upon which the door is hung will be secured a plate of metal, shown on
drawing and marked B. having an inclined face against which the spring bolt of the
alarm apparatus will work. The said face of the plate being at an angle to the
central line of the bolt. The outer end of this bolt is provided with a runner shown
on drawing marked C. or it may be bevilled.
The action of the device will be such that upon opening the door the end of the
spring bolt will engage with and ride upon the inclined face plate, so causing the
spring bolt to be driven inwards upon the striking mechanism of the alarm.
The alarm device consists of a casing on one side of which (internally) there is
provided a bracked peice in which will be supported the spring bolt (marked F. on
drawing) and free to slide to and fro, as shown on drawing and marked G. between
two arms of the said bracket will project a rack attached to or of a peice with the
bolt body, marked F and running on small cogwheel marked E. This spindle carries
a pinion which gears with the ratchet of the spring bolt and also carries a lappet that
acts on a striker (and marked D on drawing) which will in its turn act upon portion
of the mechanism marked ( which being put in motion by opening the door, window,
or casing as the case may be causes the striker marked B. on drawing to ring
the Bell.
The bolt.is furnished at the end with a small runner marked H on drawing and this
runner working on a plate fixed on door post marked B 1 causes (with the action of
the spring) the bolt to return to its normal position by closing the door.
The striker marked B drawing consists of a pivoted lever to the foot of which is
attached a spring marked J. said lever arm carries a second lever marked C (drawing)
to one end thereof is applied a spring and the other free end will be operated upon by
the arm of lappett C and D. (drawing) to the first lever arm will be attached the
hammer marked B (drawing) as may be convenient.
Upon the casing will be applied a sliding bolt or stop with a screw button-marked D
drawing on the outside and a stop peice on the inside marked K on drawing. This
stop peice may be set by means of the screw button (or nob) to move up or down so
as to prevent the hammer reaching the Bell or gong if it be desired not to operate
the alarm.
This mechanism may be applied to various hinged doors, windows, partitions or
covers, for show cases, and such like purposes, wherein automatic closing of the door
or cover is desirable.
The mechanism may be used as an alarm without the spring for closing the
door.
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
1st. A door spring and alarum which upon opening the door will cause a bell
to ring.

page_text: 2nd. A spring bolt is so fixed to the spring and alarum that it will effect the
closing of the door after the same has been released.
3rd. The spring bolt can be used indepentently of the alarum by means of a
button so fixed that it will not allow the alarum to work when required not
to do so.
Dated this Ninth day of March 1889.
ROBERT WILLIAM GAMBLE.