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Патент USA US3093410

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June 11, 1963
M E. WILLIAMS
-
3,093,400
STOP SYSTEM FOR DETERMINING THE NORMAL SECTOR
0F FREEDOM OF MOVEMENT OF A DOOR KNOB
Filed Aug. 8, 1960
I7
/
l9
I8
24
l6
FIG.
/
A
MURRAY
E.
WILLIAMS
INVENTOR.
BY
'
W 15.50%‘
Unite States Patent 0
Patented June 11, 1963
2
1
dicular to the axis of the sleeve. The frame also includes
a locking plate 19 preferably mounted against each of the
?anges 18. The con?guration of the ?anges 18 and the
plate 19 are axially similar, one being substantially an
axial projection of the other. The combinations of the
plates 19 and the ?anges 18 at the opposite sides of the
latch mechanism are held in the assembled relationship
by the intermediate frame member 20. The effect of
the intermediate frame member 20 is to maintain the
3,093,400
STOP SYSTEM FOR DETERMINING THE NORMAL
SECTOR OF FREEDOM OF MOVEMENT OF A
DOOR KNOB
Murray E. Williams, Grand Rapids, Mich., assignor to
Dexter Industries, Inc., Grand Rapids, Mich., a corpo
ration of Michigan
Filed Aug. 8, 1960, Ser. No. 47,983
1 Claim. (Cl. 292—1)
3,093,400
10 relative angular and axial positions of the plates 19 and
This invention relates to the construction of door
latches, ‘and particularly to a system for determining the
normal freedom of rotary movement of a door knob
retracting the latch bolt. It is desirable that this sec
the ?anges 18, and these components may therefore be
mechanism in order to prevent the transfer of excessive
strains to a structure which should not be required to
resist abuse. The stop structure should provide a sector
of movement adequate to operate the 'bolt of the door
on August 8, 1960, now abandoned.
The central opening 21 of the plates 19 forms an inner
considered as normally ?xed with respect to each other.
The details of the engagement of the components consti
tuting the frame 10‘ are shown vand described in the appli
tor be determined independently of the operating latch 15 cation of Murray E. Williams, Serial No. 47,982, ?led
1
bearing locating the end of the sleeves. The lugs 22 and
23 extend ‘axially within the space de?ned by the clear
latch without permitting such an excess of movement as 20 ance portion 17 of the knob-supporting members 15, and
are disposed to clear the outer diameter of the sleeves.
would distort the components of the mechanism. The
Sleeves are therefore free to rotate within the opening
present invention provides a very simple and effective
21, until such rotation is interfered with by the engage
means for transferring any excess torque directly from
ment of the abutment 2‘4 with either of the lugs 22 or
the knob sleeve over to the door structure surrounding
the latch mechanism without involving the latch mecha 25 23. The abutment 24 is preferably a section of the mate
rial of the sleeve which is lanced out of cylindrical posi
nism itself. This broad concept is not totally new, but
tion so that it extends on an incline with respect to the
the structure provided by this invention permits this fea
sleeve into the space existing between the cylindrical
ture to be utilized very economically and with a mini
outer surface of the sleeve and the inside surface of the
mum of maintenance requirements. The several features
of this invention will be analyzed in detail through the 30 clearance portion 17. This abutment therefore moves
around a path which is intersected by the lugs 22 or 23,
discussion of the particular embodiments illustrated in the
and the result is a limitation of the freedom of movement
accompanying drawing. In the drawing:
of the sleeve within the sector .thu-s de?ned. The normal
FIGURE 1 presents a perspective view, partially in sec
position determined by the spring mechanism conven
tion, showing the normal free position of the device prior
35 tionally associated with the retractor 12 is illustrated in
to the actuation of the door knob.
FIGURE 1, with the position of the lugs 22 and 23 being
FIGURE 2 presents a perspective view, ‘also partially
disposed to permit the desired degree of rotation of the
in section, and showing the engagement of the stop mech
knob in either direction from the illustrated neutral posi-_
anism for limiting the rotary movement of the knob
tion. It is noteworthy that the position of the abutment
sleeve.
FIGURE 3 presents a perspective view of the locking 40 24, and the fact that it is displaced from the material
of the sleeve 13 along axial planes, provide a tremen
plate used in conjunction with the structure illustrated
dous amount of strength against the forces encountered
in FIGURES I1 and 2.
through engagement with the lugs 22 and 33. These
Referring to the drawing, the views illustrate a unit,
commonly known as a “cylindrical” mechanism for re 45 forces are directly transferred into the plates 19, and from
there to the mounting screws (not shown) which engage
tracting a latch bolt. The frame generally indicated at
the holes 25 and 26, these holes ‘being ?xed in position
‘10 supports the retractor 11 for reciprocating sliding
with respect to the surrounding door.
movement. The jaws 12 of the retractor engage the stem
The particular embodiments of the present invention
(not shown) of a latch bolt for retracting the same when
it is desired to open the door. Movement of the retrac 50 which have been illustrated and discussed herein are for
illustrative purposes only and are not to be considered
tor 11 is induced by rotation of the knob sleeves 13 or
114 by the associated knobs (not shown), this operation
taking place in the conventional fashion through the
as a limitation upon the scope of the appended claim.
In this claim, it is our intent to claim the entire invention
disclosed herein, except as we 1are limited by the prior art.
functioning of roll-back cams normally at the inner ends
of the sleeves 13 and 14. This portion of the mechanism 55 I claim:
In a latch mechanism, a'stop system for establishing
is conventional, and forms no part of this invention.
the normal sector of freedom of knob rotation, compris
The frame »10, in the illustrated form of the invention,
ing: frame means including a knob-supporting member
is generally similar at the axially opposite sides of the
latch (with respect to the axis of the sleeves 13 and 14).
provided with a cylindrical bearing portion, a clearance
bearing portion 16 for rotatably supporting the associated
sleeve, the clearance cylindrical portion 17 of somewhat
larger inside diameter than that of the bearing portion
of said bearing portion, and also having a ?ange portion
containing an opening coaxial with said clearance portion
and secured to said clearance portion and disposed in a
plane perpendicular to the axis of said clearance portion
Each side includes a knob-supporting member indicated 60 cylindrical portion extending from said bearing portion
coaxially therewith and of increased diameter over that
generally at 15. This member includes a cylindrical
16, and the ?ange portion 18 disposed in a plane perpen- '
3,093,400
4
at the opposite end thereof-from said ‘bearing portion,
said frame means also including a plate normally secured
the periphery of said sleeve within the space enclosed by
said clearance portion and disposed to engage said lug
to said ?ange portion and having a central opening co
on rotation of said knob sleeve to determine the normal
sector of freedom thereof.
axial with said clearance portion, said plate having a lug
extending axially therefrom and radially outwardly of
said central opening into said clearance portion; a knob
sleeve having a substantially annular cross section
throughout its length, extending through and being rotat
ably mounted in said bearing portion and said openings,
and having an abutment portion extending outward from 10
References Cited in the ?le of this patent
UNITED STATES PATENTS
Eiohel _______________ .._ Apr. 118, 1933
2,795,948
Rayburn _____________ __ June 18, 1957
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