US2749168A - Door latch - Google Patents

Door latch Download PDF

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Publication number
US2749168A
US2749168A US524420A US52442055A US2749168A US 2749168 A US2749168 A US 2749168A US 524420 A US524420 A US 524420A US 52442055 A US52442055 A US 52442055A US 2749168 A US2749168 A US 2749168A
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United States
Prior art keywords
door
opening
knob
latch
projecting member
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Expired - Lifetime
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US524420A
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Asa J Harris
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Individual
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C17/00—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith
    • E05C17/02—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means
    • E05C17/46—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means in which the wing or a member fixed thereon is engaged by a movable fastening member in a fixed position; in which a movable fastening member mounted on the wing engages a stationary member
    • E05C17/50—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means in which the wing or a member fixed thereon is engaged by a movable fastening member in a fixed position; in which a movable fastening member mounted on the wing engages a stationary member comprising a single pivoted securing member
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C17/00—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith
    • E05C17/02—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means
    • E05C17/46—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means in which the wing or a member fixed thereon is engaged by a movable fastening member in a fixed position; in which a movable fastening member mounted on the wing engages a stationary member
    • E05C17/50—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means in which the wing or a member fixed thereon is engaged by a movable fastening member in a fixed position; in which a movable fastening member mounted on the wing engages a stationary member comprising a single pivoted securing member
    • E05C17/505—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means in which the wing or a member fixed thereon is engaged by a movable fastening member in a fixed position; in which a movable fastening member mounted on the wing engages a stationary member comprising a single pivoted securing member acting directly on the knob or handle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00—Closure fasteners
    • Y10T292/08—Bolts
    • Y10T292/1043—Swinging
    • Y10T292/1063—Gravity actuated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00—Closure fasteners
    • Y10T292/42—Rigid engaging means
    • Y10T292/444—Swinging catch
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00—Closure fasteners
    • Y10T292/82—Knobs

Definitions

  • An object of the present invention is to provide means for automatically latching a hinged door in an open position and to permit release thereof by turning of the door knob in either rotational direction.
  • Another object of the present invention is to provide a door latch that is equipped with a resilient cushion or bumper to prevent rattling and to act as a buffer or bumper for the door knob.
  • a further important object of the present invention is to provide a door latch which is simple in construction, easy to manipulate, substantially automatic in latching operation, constructed of a minimum of exposed and moving parts, well adapted for its intended purposes and relatively inexpensive to manufacture.
  • Figure 1 is a side elevational view of the door latch of the present invention with portions thereof being broken away illustrating the internal construction of the hollow door knob together with the projecting member with the latch member pivoted thereto;
  • Figure 2 is a sectional view similar to Figure 1 illustrating the position of the door knob when the door knob has been moved to an unlatched position;
  • Figure 3 is a transverse sectional view taken substantially upon a plane passing along section line 33 of Figure 1 illustrating the relationship of the pivotal latch member and the door knob when in latched position;
  • Figure 4 is a sectional View taken substantially upon the same plane as Figure 3 showing the position of the door knob when it is in unlatched position;
  • Figure 5 is an end view of the latch member and the buffer plate.
  • the numeral generally designates the door latch of the present invention for attachment to a pivotal door 12 for retaining the door 12 in position alongside a supporting structure such as a wall 14.
  • the door 12 is provided with the usual catch 16 and operating bolt 18 therefor having the usual door knob 20 on one end thereof.
  • On the other end of the lock bolt 18 is a hollow door knob 22 which is secured thereon by the usual setscrew 24.
  • the hollow door knob 22 includes an enlarged hollow portion 26 with a relatively small cylindrical opening 28 in the center of the outer face thereof and a transversely extending flat bottom 38 in the hollow portion 26 spaced slightly below the lower edge of the opening 28 and joined thereto by a generally concave portion 32.
  • a base member 34 Secured to the wall 14 is a base member 34 having an outwardly extending projecting member 36 integrally 2,749,168 Patented June 5, 1956 2 formed therewith and a circular bumper or buffer plate 38 made of suitable resilient material for forming a cushion in surrounding relation to the" projecting member 36 and resting against the front surface of the base plate 34 which may be attached to the wall 14 by any suitable means.
  • the outer end of the projecting member 36 is provided with a pair of spaced lugs 40'defining' aslot 42 for pivotally receiving a latch member 44 which is pivot'ally mounted by a transverse pivotpin 46;
  • the latch mem* ber '44 is of a width whichis substantially equal to the diameter of the cylindrical projecting member 36 and is rovided with a rounded outer end- 48' and a rounded inner end 50 wherein the inner end 50 is formed of a radius which is not more than the radius of the cylindrical member 36 wherein the inner end 50 will at all times be disposed within the confines of the projecting member 36.
  • the latch member 44 is freely pivotal on the pivot pin 46 and is actuated by gravity to a normally dependent relation, substantially as illustrated in Figure 2.
  • the opening 28 in the door knob 22 is slightly larger than the periphery of the projecting member 36 for permitting passage of the member 36 into the hollow portion 26.
  • the edges of the opening 28 engage the forward edge of the latch member 44, thereby pivoting it rearwardly into the slot 42 between the lugs 40 wherein the latch member 44 will be completely disposed within the confines of the projecting member 36.
  • the latch member 44 After the inner curved end 48 of the latch member 44 passes the inner edge of the opening 28, the latch member 44 is moved downwardly by gravity to an inclined position, substantially as illustrated in Figure 1, wherein the free curved end 48 is disposed against the concave junction 32 between the bottom 30 of the hollow portion 26 and the lower edge of the opening 28 with the pivot pin 46 disposed inwardly thereof, thereby preventing withdrawal of the projecting member 36 from the knob 22 for locking the door 12 in open position.
  • a door latch for retaining a door in an open position adjacent a supporting structure comprising a hollow door knob adapted to be mounted on the door for turning in opposite directions, said knob having an opening in the outer face thereof, a transverse horizontal bottom in said hollow knob spaced below the lower edge of said opening, a projecting member mounted on the supporting structure and adapted to be closely received through said opening in the knob, and a pivotal latch member mounted on said projecting member, said latch member being normally retained in depending relation by gravity, the free end of the latch member being moved rearwardly to a position within the confines of the projecting member by the edge of the opening when the projecting member passes through the opening, the free end of said latch member then falling downwardly and engaging the juncture between the horizontal bottom of the knob and the lower edge of said opening in an inclined position with the free end of the latch member disposed adjacent the opening and the free end of the projecting member being remote from the opening thereby preventing withdrawal of the projecting member from the opening, said hollow knob being sufficiently large whereby said latch member may be disengaged

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lock And Its Accessories (AREA)

Description

June 5, 1956 J HARR|5 2,749,158
DOOR LATCH Filed July 26, 1955 Fig. //2
Asa J Harris INVENTOR.
United States Patent V DOOR LATCH Asa J. Harris, Harbor Island, N. C.
Application July 26, 1955, Serial No. 524,420
1 Claim. (Cl. 292-230) This invention generally relates to a door latch, and more specifically provides an improved and novel structure over that of my previous Patent No. 2,452,461, issued October 26, 1948.
An object of the present invention is to provide means for automatically latching a hinged door in an open position and to permit release thereof by turning of the door knob in either rotational direction.
Another object of the present invention is to provide a door latch that is equipped with a resilient cushion or bumper to prevent rattling and to act as a buffer or bumper for the door knob.
A further important object of the present invention is to provide a door latch which is simple in construction, easy to manipulate, substantially automatic in latching operation, constructed of a minimum of exposed and moving parts, well adapted for its intended purposes and relatively inexpensive to manufacture.
These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:
Figure 1 is a side elevational view of the door latch of the present invention with portions thereof being broken away illustrating the internal construction of the hollow door knob together with the projecting member with the latch member pivoted thereto;
Figure 2 is a sectional view similar to Figure 1 illustrating the position of the door knob when the door knob has been moved to an unlatched position;
Figure 3 is a transverse sectional view taken substantially upon a plane passing along section line 33 of Figure 1 illustrating the relationship of the pivotal latch member and the door knob when in latched position;
Figure 4 is a sectional View taken substantially upon the same plane as Figure 3 showing the position of the door knob when it is in unlatched position; and
Figure 5 is an end view of the latch member and the buffer plate.
Referring now specifically to the drawings, the numeral generally designates the door latch of the present invention for attachment to a pivotal door 12 for retaining the door 12 in position alongside a supporting structure such as a wall 14. The door 12 is provided with the usual catch 16 and operating bolt 18 therefor having the usual door knob 20 on one end thereof. On the other end of the lock bolt 18 is a hollow door knob 22 which is secured thereon by the usual setscrew 24.
The hollow door knob 22 includes an enlarged hollow portion 26 with a relatively small cylindrical opening 28 in the center of the outer face thereof and a transversely extending flat bottom 38 in the hollow portion 26 spaced slightly below the lower edge of the opening 28 and joined thereto by a generally concave portion 32.
Secured to the wall 14 is a base member 34 having an outwardly extending projecting member 36 integrally 2,749,168 Patented June 5, 1956 2 formed therewith and a circular bumper or buffer plate 38 made of suitable resilient material for forming a cushion in surrounding relation to the" projecting member 36 and resting against the front surface of the base plate 34 which may be attached to the wall 14 by any suitable means.
The outer end of the projecting member 36 isprovided with a pair of spaced lugs 40'defining' aslot 42 for pivotally receiving a latch member 44 which is pivot'ally mounted by a transverse pivotpin 46; The latch mem* ber '44 is of a width whichis substantially equal to the diameter of the cylindrical projecting member 36 and is rovided with a rounded outer end- 48' and a rounded inner end 50 wherein the inner end 50 is formed of a radius which is not more than the radius of the cylindrical member 36 wherein the inner end 50 will at all times be disposed within the confines of the projecting member 36.
The latch member 44 is freely pivotal on the pivot pin 46 and is actuated by gravity to a normally dependent relation, substantially as illustrated in Figure 2.
The opening 28 in the door knob 22 is slightly larger than the periphery of the projecting member 36 for permitting passage of the member 36 into the hollow portion 26. When the projecting member 36 passes through the opening 28, the edges of the opening 28 engage the forward edge of the latch member 44, thereby pivoting it rearwardly into the slot 42 between the lugs 40 wherein the latch member 44 will be completely disposed within the confines of the projecting member 36. After the inner curved end 48 of the latch member 44 passes the inner edge of the opening 28, the latch member 44 is moved downwardly by gravity to an inclined position, substantially as illustrated in Figure 1, wherein the free curved end 48 is disposed against the concave junction 32 between the bottom 30 of the hollow portion 26 and the lower edge of the opening 28 with the pivot pin 46 disposed inwardly thereof, thereby preventing withdrawal of the projecting member 36 from the knob 22 for locking the door 12 in open position.
In order to release the latch member 44, it is only necessary to rotate the knob 22 in either direction by gripping the knob 20, wherein the bottom 30 will move out of engagement with the free end 48 of the latch member 44, substantially as illustrated in Figure 4, thereby permitting the inner edges of the opening 28 to move the latch member 44 to a position coextensive with and extending from the projecting member 36 wherein the projecting member 36 may then be released from the door knob 22 to permit movement of the door to a closed position.
The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.
What is claimed as new is as follows:
A door latch for retaining a door in an open position adjacent a supporting structure comprising a hollow door knob adapted to be mounted on the door for turning in opposite directions, said knob having an opening in the outer face thereof, a transverse horizontal bottom in said hollow knob spaced below the lower edge of said opening, a projecting member mounted on the supporting structure and adapted to be closely received through said opening in the knob, and a pivotal latch member mounted on said projecting member, said latch member being normally retained in depending relation by gravity, the free end of the latch member being moved rearwardly to a position within the confines of the projecting member by the edge of the opening when the projecting member passes through the opening, the free end of said latch member then falling downwardly and engaging the juncture between the horizontal bottom of the knob and the lower edge of said opening in an inclined position with the free end of the latch member disposed adjacent the opening and the free end of the projecting member being remote from the opening thereby preventing withdrawal of the projecting member from the opening, said hollow knob being sufficiently large whereby said latch member may be disengaged from the bottom of the knob when the knob is turned in either direction for permitting the latch member to fall freely to 21 depending position whereby the edges of the opening will move the free end of the latch member forwardly to a position coextensive with the projecting memher when the projecting member is withdrawn through the opening, said opening and projecting member being cylindrical with the projecting member having a slot in the outer end for pivotally receiving said latch member, said latch member having rounded ends with the inner end being constantly within the confines of the projecting member.
References Cited in the file of this patent UNITED STATES PATENTS 624,080 Pease May 2, 1899 1,728,693 Moore Sept. 17, 1929 1,834,163 Lasier Dec. 1, 1931 2,452,461 Harris Oct. 26, 1948 2,544,611 Knottingham Mar. 6, 1951
US524420A 1955-07-26 1955-07-26 Door latch Expired - Lifetime US2749168A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2914792A (en) * 1957-04-19 1959-12-01 Jr Donald K Campbell Door check
US3738061A (en) * 1971-06-07 1973-06-12 J Catalano Latch means
US3921334A (en) * 1974-02-06 1975-11-25 Sr William R Black Window guard apparatus
US6202788B1 (en) * 1997-05-07 2001-03-20 Plettac Ag Latch for scaffold
US20140300118A1 (en) * 2014-06-24 2014-10-09 Caterpillar Inc. Door system for machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US624080A (en) * 1899-05-02 Shutter-fastener
US1728693A (en) * 1929-09-17 Holdback device and door closer
US1834163A (en) * 1930-03-31 1931-12-01 Nortonlasier Company Door holder
US2452461A (en) * 1946-01-11 1948-10-26 Asa J Harris Door latch
US2544611A (en) * 1947-03-04 1951-03-06 Phillips Tutch Latch Company Latch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US624080A (en) * 1899-05-02 Shutter-fastener
US1728693A (en) * 1929-09-17 Holdback device and door closer
US1834163A (en) * 1930-03-31 1931-12-01 Nortonlasier Company Door holder
US2452461A (en) * 1946-01-11 1948-10-26 Asa J Harris Door latch
US2544611A (en) * 1947-03-04 1951-03-06 Phillips Tutch Latch Company Latch

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2914792A (en) * 1957-04-19 1959-12-01 Jr Donald K Campbell Door check
US3738061A (en) * 1971-06-07 1973-06-12 J Catalano Latch means
US3921334A (en) * 1974-02-06 1975-11-25 Sr William R Black Window guard apparatus
US6202788B1 (en) * 1997-05-07 2001-03-20 Plettac Ag Latch for scaffold
US20140300118A1 (en) * 2014-06-24 2014-10-09 Caterpillar Inc. Door system for machine

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