Improvements in Door Cheoks.
Year: 1897

page_text: Date of Application, 2nd Feb., 1897-Accepted, 20th Mar., 1897
Communicated from abroad by RUSSELL AND ERWIN MANUFACTURING
COMPANY, of New Britain, Connecticut, United States of America.]
Improvements in Door Cheoks.
I, LEONARD DOIG, of Russell & Erwin Manufacturing Company, of Brooks
Wharf, Upper Thames Street, in the City of London, do hereby declare the
nature of this invention and in what manner the same is to be performed, to he
particularly described and ascertained in and by the following statement :-
This invention relates to improvements in door checks and has for its main
objects simplicity and economy in construction and convenience and efficiency
in use.
In the accompanying drawings
Figure 1 is a plan view of my improved door check, partly in horizontal sention
together with one of the door hinges D and a line representing the face of the door
and its casing.
Figure 2 is a front elevation of the sanie.
Figure 3 is a vertical section on the line
shown in elevation.
of Figure 4, some of the parts being
Figure 4 is a plan view of portions of my improved check, the spring chamber
being removed.
Figure 5 is a detached plan view of the inner end of the spring chamber and
spring.
Figure 6 is a central longitudinal section of the main portion of the adjustable
connecting arm or link, and
Figure 7 is a transverse section of the same on the line yy of Figure 6.
Like letters and figures of reference denote corresponding parts in the several
.figures.
A designates the cylinder, B the crank chamber, and C the spring chamber, the
latter being adjustable on the crank chamber. These parts together constitute the
case or frame, the crank chamber being provided with a bracket 7 by means of
which the check may be secured to the door. The spring chamber C is provided
with a shouldered tenon 8 fitting into the upper end of the crank chamber, said
tenon having formed in it a circumferential groove 9, into which the end of one or
more fastening screws 10 may enter to prevent vertical displacement of and to
secure the said spring chamber to the said crank chamber while at the same time
allowing the spring chamber to be freely rotated or partially rotated therein when
desired. A central boss 11 at the outer end of the crank chamber has formed in it
a suitable bearing for one end of the crank shaft 12, and the outer end of the
spring chamber has a similar boss 13 and bearing for the other end of said crank
shaft. The spring chamber is also provided near its shouldered tenon 8 with a
series of ratchet teeth 14, while a spring pressed pawl 27 for engaging said teeth
is pivoted to the bracket portion of the crank chamber. The crank shaft, at the
portion within the spring chamber, is longitudinally grooved or shouldered as at 15
for engagement with the hook 16 Figure 5. at the inner end of the spring 38, while
the wall of said spring chamber is furnished with a shoulder 17 for the hook 18 of
the outer end of the spring to engage with, or any other ordinary connection of the
ends of the spring respectively with the crank shaft and spring chamber may be
substituted for said hooks and engaging shoulders.

page_text: The crank 18 of the crank shaft 12, is connected by means of the link 19 to
the piston rod. 20, one end of said link being pivoted to said crank while the other
end is pivoted to the piston rod by the pin 21. The piston rod is connected with
a suitable piston E constructed in the usual manner to allow the air to pass it in one
direction, and the cylinder is provided with a vent 22.
I form said vent in a boss at the end of the cylinder, the said boss in addition to
being bored and threaded to receive the adjusting screw 23 is grooved transversely
across its face as at 24. The adjusting screw is provided with a nut 39 which is
turned up firmly against the grooved face of the boss to lock the said screw in its
adjusted position after the manner of an ordinary lock nut, while at the same time
the transverse groove 24 in the face of said boss prevents the said nut from in aoy
way clogging the veut.
The groove 24 should be fully as wide or wider than the diameter of the screw,
so that the longitudinal groove 25 in said adjusting screw will always open into
the said groove no matter in what position it may be set. By the employment of
the lock nut and grooved boss in connection with the adjusting screw, the vent
is less liable to become clogged or partly clogged so as to change the closing speed
of the door.
Upon the inside of the crank chamber is a stop 26 Figure 4, to limit the
movement of the crank in the direction that it is moved by the spring. The spring
chamber may be rotated or partially rotated upon the crank chamber to give any
desired tension while the pawl 27 engaging the ratchet teeth 14 on the spring
chamber will hold the said chamber in its adjusted position. The stop 26 is
arranged in such a position as to permit the crank to turn a little farther than the
position it will have when the piston is at the extreme limit of its movement toward
the outer end of the cylinder.
Both ends of the crank shaft project from the case and are formed with flats as
at 28, or otherwise made angular to fit the socket or head of the crank arm 29
and both bosses 11 and 13 are externally threaded to receive the ornamental cap or
top 40 for covering either end of the crank shaft as may be desired. The door
check may be secured upon the door with either end of the crank shaft at the top
to adapt the check for use on a right hand or left hand door. When the crank
arm is secured to one end of the crank shaft, for example at the upper end as
shown, the cap or tip is screwed upon the boss at the opposite end to cover the
unused end of the crank shaft as shown. The crank arm is connected with the door
casing by means of a bracket 30 and an adjustable link. One member of the
link is the bar 31, pivoted at one end to the outer end of the crank arm and having
a longitudinal groove 32 with a series of perforations 33 in the bottom of said
groove. The other member of the link is the round rod 34, pivoted by one
end to the bracket 30 and having at its opposite end the pin or projection 35 at
right angles to its length and fitted to engage any one of the perforations in
the series 33 as may be desired. The diameter of the rod should correspond with
the longitudinal groove in the bar 31 so as to hold the rod and bar in longitudinal
alignment. I lock the rod in the groove in the bar by means of a yoke or ring 86
and its set screw 37. By loosening the set scrow and slipping the yoke toward the
pivoted end of the bar 31 the pin 35 can be set into any desired one of the
perforations to give the complete link the desired length and then the overlapping
ends of the two members can be secured in their adjusted position by clipping the
yoke back into place and tightening its set screw.
The parts may be so mounted on a door and casing that when the door is closed
the crank and link will stop a little short of coming into alignment as shown in
Figure 4, and so that the crank 18* will not engage the stop 26 in the ordinary
operation of the check. Upon the opening of the door the crank shaft and crank
will be turned in the direction indicated by the arrow in Figures 1 and 4. In
case of any accident causing the release of the crank arm 29, the crank 18 will be
arrested and held by the stop 26 and injury due to the unwinding of the spring
will be prevented.
i

page_text: 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. In a door check, the combination of the cylinder, the crank chamber,
the spring chamber rotatably mounted on said crank chamber and having a
series of ratohet teeth, the pawl pivoted on the case of said crank chamber,
the spring with its outer end secured to said spring chamber, the crank shaft
connected to the inner end of said spring and to the piston, and means for
connecting the said parts with a door and its casing, substantially as, and for the
purpose, specified.
2. In the said door check the stop for limiting the movement of the crank under
the influence of the spring, substantially as, and for the purpose, specified.
3. The adjustable connecting-link substantially as described with reference to
Figures 1, 2, 6 and 7 of the drawings and operating as specified.
4. The construction of the vent boss, in combination with the adjusting screw 23
and the lock nut therefor, substantially as, and for the purpose, specified.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.