US3737183A

US3737183A - Door lock

Info

Publication number: US3737183A
Authority: US
Inventors: J Pastva
Original assignee: Eastern Co
Current assignee: Eastern Co
Priority date: 1970-03-16
Filing date: 1971-05-20
Publication date: 1973-06-05
Anticipated expiration: 1990-06-05

Abstract

A cam-type door lock including latch members on opposite ends of an oscillatable rod attachable to a pivoted door adjacent to the non-pivoted side and engageable with keeper members attachable to the door frame adjacent to opposite side edges of the door to secure the door in closed position and a third lock point intermediate the opposite side edges including a strap or latch member secured to the shaft intermediate its ends engageable with a third keeper member on the adjacent door or door frame to pull the two together and towards closed position. The first mentioned latching members overlie the end of the rod or shaft to which they are attached, are symmetrical about the axis of the rod or shaft and each has oppositely projecting forked cam portions adapted to straddle two spaced post portions of the cooperating keeper members. The post portions of the keeper members have tapered side surfaces engageable by the forked cam portions during latching to assure alignment of the door with the frame and to prevent lateral shifting or distorting of the frame in the plane of the door after latching. One post portion of each of the first mentioned keeper members has projecting flange portions with concave surfaces engageable by the forked cam portions of the associated latch member to retain the door in a closed position.

Description

Pastva, J r.

[451 June 5, 1973 54] DOOR LOCK [75] Inventor: John V. Pastva, Jr., Parma Heights,

Ohio

[73] Assignee: The Eastern Company, Cleveland,

Ohio

[22] Filed: May 20, 1971 [21] Appl. No.: 145,279

Related U.S. Application Data [63] Continuation-impart of Ser. No. 19,867, March 16,

1970, Pat. No. 3,695,661.

[52] U.S. Cl ...292/7, 292/218 [51] Int. Cl. ..E05c 7/04 [58'] Field of Search ..292/2l8, 109, 110,

292/1 16, 6, 7,11,111, 65, DIG. 46, DIG. 49

[56] References Cited UNITED STATES PATENTS Primary Examiner-Richard E. Moore Attorney-Watts, Hoffmann, Fisher & Heinke [57] ABSTRACT A cam-type door lock including latch members on opposite ends of an oscillatable rod attachable to a pivoted door adjacent to the non-pivoted side and engageable with keeper members attachable to the door frame adjacent to opposite side edges of the door to secure the door in closed position and a third lock point intermediate the opposite side edges including a strap or latch member secured to the shaft intermediate its ends engageable with a third keeper member on the adjacent door or door frame to pull the two together and towards closed position. The first mentioned latching members overlie the end of the rod or shaft to which they are attached, are symmetrical about the axis of the rod or shaft and each has oppositely projecting forked cam portions adapted to straddle two spaced post portions of the cooperating keeper members, The post portions of the keeper members have tapered side surfaces engageable by the forked cam portions during latching to assure alignment of the door with the frame and to prevent lateral shifting or distorting of the frame in the plane of the door after latching. One post portion of each of the first mentioned keeper members has projecting flange portions with concave surfaces engageable by the forked cam portions of the associated latch member to retain the door in a closed position.

2 Claims, 6 Drawing Figures PATENTED 5 I 7 3,737,183 SHEEI 10F 2 9* Hull I mm,

mu I 32 MIM INVENT OR.

F Q 1 JOHN v. PASTVA,JfZ.

svflr j Jam ATTORNEYS DOOR LOCK RELATED APPLICATION This application is a continuation-in-part of my copending application, Ser. No. 19,867, filed Mar. 16, 1970, entitled Door Control Mechanism, U.S. Pat. No. 3,695,661 issued Oct. 3, 1972.

FIELD OF INVENTION This invention relates to door control mechanism of the type used for securing and maintaining pivoted doors, and more particularly, pivoted doors of trucks, trailers and/or large cargo containers, in their associated door frames, and the like.

DESCRIPTION OF THE PRIOR ART Load carrying compartments such as truck and trailer bodies and transport cargo containers typically utilize pivoted double doors at one end wall to facilitate loading. and unloading. Because the door opening is essentially co-extensive with the end wall of the load compartment, cross bracing is lacking and the frame is readily distortable incident to uneven support, etc. Door control mechanisms are used with such doors to retain the doors closed and reduce or eliminate racking, and typically include one or more lock rods extending the height of the door and having latch members at each and engageable with keeper members on the door frame. Some of the latch members have portions extending laterally on opposite sides of the lock rod provided with cam surfaces engageable with cam surfaces of the keeper members. Mechanisms of this type in which latch members are provided with forked portions to assure alignment of a door with the door frame and prevent racking, i.e., transverse distortion of the rectangular door frame are disclosed in my prior U.S. Pat. Nos. 3,099,473 and 3,484,127, over which the present invention constitutes an improvement.

SUMMARY OF THE INVENTION The invention provides a novel and improved door control mechanism or lock of the cam type which utilizes a number of readily produceable parts and which latches or locks the doors to the door frame at its upper and lower edges and to a second door or frame member at the side opposite the hinge or hinges intermediate the upper and lower edges. The lock is inexpensive to manufacture, and in operation forcibly closes a door and aligns it with its door frame and thereafter maintains alignment and reinforces the door frame.

One of the principal objects of the invention is the provision of a novel and improved door control mechanism comprising a lock rod or shaft to be secured to a door adjacent to the non-hinged side for rotation about an axis parallel to the door hinge, a handle for turning the lock rod about its longitudinal axis, a handle retainer and/or lock, a latch member carried at each opposite end of the lock rod cooperable with keeper members secured to the top and bottom frame members of adjoining structure to which the door is pivoted, a third latch member secured to the lock rod or shaft intermediate its ends cooperable with a third keeper member to secure the door to an adjoining structure such as a second door, cooperable cam surfaces on the latch members and keeper members for forcing the door closed and into alignment with the door frame during latching and thereafter maintaining the door closed and aligned, etc. The design and construction is such that the door reinforces of cross braces the frame inhibiting distortion, increasing the strength of the assembly, etc.

A further object of the invention is the provision of a novel and improved door control mechanism of the character referred to, having latch members at the ends of an oscillatable shaft or lock rod provided with U- shaped body portions open only the axial length to receive the supporting lock rod and oppositely extending forked portions each having cam surfaces which cooperate with portions of a cooperating keeper so that when the lock rod is turned to latch position one of the forked portions latches the door in a closed position and cam surfaces of both forked portions cooperate with the keeper member to align the door relative to the frame and/or inhibit relative shifting of the door and frame out of alignment in the plane of the door in combination with a third latch member connected to the lock rod intermediate its ends and an associated keeper both having cooperating surfaces assisting in the aligning and closing of the door or doors.

These and other features and advantages of the invention will be better understood from the following description of the preferred embodiment shown in the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial elevational view of the back end of a truck having double access flush-type doors equipped with the preferred embodiment of the invention;

FIG. 2 is an enlarged view of a part of FIG. 1;

FIG. 3 is a sectional view approximately on the line 3-3 of FIG. 2;

FIG. 4 is a sectional view on the line 4--4 of FIG. 2;

FIG. 5 is an enlarged view of a part of FIG. 1; and

FIG. 6 is a sectional view on the line 6-6 of FIG. 5.

DESCRIPTION OF PREFERRED EMBODIMENT The preferred door control mechanism, designated generally by the reference character A, is shown applied to a truck body B having rear flush-type double access doors C, D hinged to the door frame 10 of the truck body along opposite vertical side edges.

The door control A includes a shaft or lock rod 12 rotatably supported against axial movement by a plurality of suitable upper and lower bearing members or

brackets

14, 16 and one or more intermediate bearing members or brackets 18 along the rear or outer side of the door C adjacent to its free or non-pivoted side edge 20. The ends of the shaft 20 extend above the upper edge 22 of the door and below the lower edge 24 of the door an have upper and lower latch members 30, 32 fixed thereto which cooperate when the door is being closed and while closed with upper and

lower keeper members

34, 36 secured to the door supporting structure or frame 10 in the alignment and closing of the door and the maintenance of the door properly aligned and closed. An intermediate or third latch member 40 having one end eccentrically connected to the shaft 12 intermediate its ends cooperates with an intermediate or third keeper member 42 and a guide member 44 secured to the door D adjacent to the non-pivoted or free side edge 46 thereof for assisting in the aligning and closing of the doors, etc. A handle 47 pivoted to a bracket secured to the lock rod 12 is provided for oscillating the shaft. A handle retainer assembly 48 attached to the door C is provided for securing the handle in a fixed position relative to the door C.

The upper and lower bearing

members

14, 16 are secured to the door B adjacent to its upper and

lower edges

22, 24 respectively, are identical in construction and only the upper bearing member 14 will be described. The bearing member 14 is formed of a back plate 50 and a-cover plate 52. Both plates are metal stampings, suitably of cold rolled steel, are generally rectangular in plan and are constructed to nest with one another to form a tubular passageway for the lock rod 12. The back plate 50 has a relatively large, flat portion 54 and at one end and adjacent to the other end a short, partial cylindrical cavity or channel 56, bounded along two opposite sides by extending

flange portions

60, 62 that in part cross the axis of the cavity 56 and in part extend parallel to the flat portion 54 in a plane spaced therefrom by the diameter of 'the lock rod 12.

The cover plate 52 which is complementary in shape to the bottom plate 50 has a relatively long longitudinal cavity or channel 64 extending in alignment with the cavity 68 of the back plate and

longitudinal flange portions

70, 72 on opposite sides of the cavity 68 which lie against the flat portion 54 of the back plate and extend in part across the depth of the cavity to merge with flat portions 74, 76 of the cover plate that lies against the

external flange portions

60, 62 of the back plate 50. The bottom of the channel 56 in the back plate 50 is spaced slightly above the flat portion 54 and the cover plate 52, as shown, has an internal circumferential depression 78 in the channel portion 68 thereof to accommodate a ring or band-like member 79 fixed to the rod 12 and which prevents or assists in preventing axial movement of the lock rod 12 in the bearing member or bracket 14. The lock rod, however, is free to rotate or turn about its longitudinal axis.

The intermediate bearing brackets 18 each comprise a back plate 80 located between the lock rod 12 and the door C and a cover plate 82 having a U-shaped central portion 84 and two extending flange portions 86, 88. The cover plate extends over the lock rod 12 and together with the back plate is secured to the door C by suitable fasteners. The plates of the'intermediate bearing brackets 18 are metal stampings, suitably of cold rolled steel.

The handle 47, for rotating the lock rod 12, is an elongated, flat, metal member pivoted at one end by a pin 90 to a channel-shaped member 92 welded at one end to the lock rod 12 with its open side facing upwardly to allow substantial pivoting of the handle about the pin 90 in an upwardly direction while permitting merely limiting pivoting of the handle in the opposite direction. The handle can be moved in a vertical plane to release it from the assembly 48, without moving the lock rod 12. Movement of the handle toward or away from the door C will turn the lock rod 12 about its longitudinal axis.

The latch members 30, 32 overlie and are fixed as by welding to the ends of the lock rod 12 projecting beyond the upper and

lower bearing members

14, 16, respectively. The latch members 30, 32 are identical in construction and are made symmetrical about a central vertical plane and only the latch member 30 will be described. The corresponding parts of the latch member 32 will be designated by the same reference characters with a prime mark affixed thereto.

The latch member 30 is a metal forging welded to the upper end of the rod 12 and includes a central U- shaped body 'portion and two forked portions extending in opposite directions toward the left and right from the central body portion and comprising fork projections or

tines

92, 94 and 96, 98 formed by V-shaped grooves providing cam surfaces 100, 102 and 104, 106, respectively, converging towards the body portion. In the preferred embodiment, the lock rod 12 is cylindrical and the central body portion 90 of the latch member is in the form of a section of a circular cylinder forming a recess or channel adapted to receive the end of the rod 12. The central body portion extends axially in the direction of the adjacent bearing member beyond the forked portion to form a semi-circular boss for engagement with the end of the bearing bracket adjacent thereto. The tines or

fork projections

92, 94, 96 and 98 are curved in a direction away from that in which the axial opening 110 faces and end in cam surfaces which terminate in a common plane that intersects the central body portion 90. The curvature of the fork projections is insufficient to produce a re-entrant angle.

The

keeper members

34, 36 are identical to each other and only the keeper member 34 will be de' scribed. The corresponding parts of keeper member 36 are identified by the same reference characters with a prime mark affixed thereto.

The keeper member 34 includes a relatively flat base portion 116 provided with apertures for attachment with fasteners to the door frame 10 in alignment with and directly opposite the associated latch member 30. Two spaced posts or post

portions

120, 122 extend outwardly from the base portion adjacent opposite left and right-hand ends thereof in position to be straddled by the

fork portions

92, 94 and 96, 98, respectively, of the associated latch member 30 as it is pivoted by rotation of the lock rod 12. The post has opposite side cam surfaces 124, 126 perpendicular to the base portion and which converge toward each other in the direction of the opposite post portion 122. The post portion 122 has opposite side cam surfaces 130, 132 that converge toward one another in the direction of the post portion 120 and which also slope or converge toward one another in an outward direction from the base'portion 116 so that the post portion 120 tapers outwardly.

The side cam surfaces 100, 102 and 104, 106 of the latch member 30 are adapted to cooperate with the cam surfaces 124, 126 and 130, 132, respectively, of the keeper member 34 to assure alignment of the door C in the door frame 10 as it is being closed and/or maintain the alignment after being closed. With the door so restrained against movement, the door becomes a structural reinforcing member for the truck body B and adds rigidity to the entire assembly.

The end of the post portion 120 of the keeper member opposite the base'll6 is provided with projecting

latch retaining flanges

134, 136 spaced from the base and against the under or rear sides of which the radially outwardly portions of the cam surfaces of the tines 92, 94 of the latch member 30 engage upon rotation of the lock rod with the door closed to firmly draw the door closed and maintain it in a closed position. The

flanges

134, 136 are spaced from the base portion 116 a distance sufficient to receive the projections 92, 94 of the latch member 30, yet close enough to the base portion to hold the door C tightly closed and preferably close enough to interfere or limit free rotation of the lock rod 12 before the handle 46 is against the door so that a slight torsion loading can be applied to the lock rod 12 by the handle 46 when the handle is forced into a position where it is retained by the assembly 48. In the preferred embodiment shown, the rear sides of the

flanges

134, 136 are provided with concave surface portions or channels 138, 140 to receive the out-turned cam ends of the projections 92, 94 of the latch member. The lefthand end of the latch member is thus covered by the

flange portions

134, 136 of the keeper when the door is closed and thereby protected or isolated against the direct application of an outside force.

The intermediate or third latch member 40 is a rectangularly shaped, strap or plate-like member, the righthand end of which overlies and is eccentrically connected to the lock rod 12 by a pivot pin 144 carried by a clevis-like member 146 welded to the lock rod 12. The opposite end or left-hand end of the member 40 has an inturned or reversed bent portion 148 projecting inwardly and towards the lock rod 12 from the main body portion of the member and providing cam surface 150 diverging from the main body portion towards the lock shaft adapted when the doors are closed to engage cooperating cam surfaces 152 on the underside of spaced

projections

156, 158 on forwardly extending portions 160, 162 of the keeper member 42. The

members

156, 158 extend from the portions 160, 162 of the keeper towards one another and at least the undersides thereof, i.e., the sides towards the door D are inclined outwardly away from the free edge 46 of the door.

The strap-like member 40 has on the side thereof adjacent to the doors, a reinforcing rib or flange 164 running lengthwise of the member and on the same side a flange or projection 166 extending toward the left, as viewed in the drawings, from a point near the rod or shaft 12. The flange 166 extends generally parallel to the main body part of the member 40 and is spaced therefrom a distance to provide clearance between the flange and the main body portion of the member for inwardly extending

members

170, 172 of the guide member 44. The

members

170, 172 extend inwardly toward the central reinforcing flange 164 of the member 40 from side portions 174, 176 of the guide member projecting forwardly from spaced base portions 180, 182 which base portions are connected by a center portion 184.

The constructions of the

members

40, 48 are such that as the member 40 is moved upon rotation of the rod or shaft 12 it not only pivots about the pivot pin 150 but it slides and pivots relative to the

projections

170, 172 which projections also limit its pivotal movement about the pivot 150. The length and location of the flange 166 is such that with the body portion of the member 40 provides an aperture or slot within which the

projections

170, 172 extend without interfering with rotation of the rod or shaft 12 but within which they are always confined between the flange 166 and the main body portion of the member 40. As the shaft 12 is oscillated the member 40 will pivot not only about the pin 144 but also about the

projections

170, 172. As the shaft 12 is rotated in a clockwise direction, as viewed in FIG. 6, the member 40 will swing or pivot about the

projections

170, 172 and the free end of the member 40, that is the end which engages the keeper 42, will move inwardly toward the plane of the door C, until stopped by the keeper 42 whereupon the guide member 44 will be pulled outwardly. As the door or doors are closed the movement of the member 40 will be in the reverse to that just referred to and the free or latch end of the member 40 will move outwardly with respect to the door C and the inturned part 154 will engage underneath the

projections

156, 158 of the keeper 42 to assist in closing the door.

The assembly 48 for holding and locking handle 47 in latch position adjacent the door C includes a back plate 170 and a fixed handle retainer member 172 welded to the lower end of the back plate to form a subassembly that is suitably secured to the door C, and a movable handle retainer member 174 pivotally supported on a bushing and the upper end fixed in an aperture in the back plate 170. The

handle retainer members

172, 174 have their intermediate portions spaced from the back plate so that together they form a recess that receives the handle 47 when the shaft 12 is in latch position. The free ends of the

retainer members

172, 174 project at right angles to the back plate 170 and are provided with alignable apertures for receiving a key-controlled lock or seal. The handle 47 can be removed from the retainer assembly 48 by pivoting the movable retainer member 176 about its supporting bushing and lifting the handle from the recess formed by the fixed retainer member 172 and then pulling the handle away from the door. This latter movement rotates the shaft 12 about its longitudinal axis to release the latch members connected thereto from their associated keepers and assist in opening the door.

From the above it will be apparent that a novel and improved door control mechanism has been provided with parts that are inexpensive to fabricate, in which the latch, keeper and bearing members at one end of the mechanism are identical to those at the other end so that a minimum number of different parts are required, and by the use of which a door can be readily latched in a closed, aligned position relative to a door frame and maintained aligned with the door frame.

While a preferred embodiment of this invention has been described in detail, it will be apparent that certain modifications or alterations can be made therein without departing from the spirit and scope of the invention as set forth in the appended claims.

Having thus described my invention, what I claim is:

1. A door control mechanism for securing a swinging door in closed position, said mechanism comprising a shaft, bearing members adjacent to opposite ends of said shaft adapted to rotatably connect said shaft to a swinging door with its axis of rotation spaced from and parallel with the pivotal axis of the door, means for oscillating said shaft about its longitudinal axis, discrete latch members secured to said shaft adjacent to opposite ends thereof each having portions projecting generally in opposite directions transversely of said shaft, discrete keeper members adapted to be secured to structure adjacent to opposite edge portions of the door that extend transversely to the pivotal axis of the door each having a base portion and spaced portions projecting from said base portion for engagement with said projecting portions of said latch members when said bearing members are secured to said door and said keeper members to said structure and said shaft is turned in one direction, one of said portions projecting from said base portion of each of said keeper members having a portion spaced from said base portion providing a surface facing said base portion for engagement by one of said projecting portions of said latch members when said shaft is turned in said one direction, a third discrete latch member connected to said shaft intermediate its ends for pivotal movement about an axis substantially parallel with but offset from the axis of said shaft, said third latch member having a body portion and a latching portion adjacent to its non-pivoted end providing a surface facing one side of said body portion and said shaft and inclined away from said body portion and a projection on said one side of said body portion intermediate the ends of said third latch member a part spaced from said body portion providing a surface facing said body portion, a discrete guide member adapted to be connected to the-door intermediate the edge of the door opposite its pivotal axis and said shaft, said guide member having a portion adapted to be positioned between said body portion of said third latch member and said surface on said part of said projection on said one side of said body portion spaced from said body portion for limiting pivotal movement of said third latch member, and a third discrete keeper member having a base portion adapted to be secured to structure adjacent to the edge of the door opposite its pivotal axis, said third keeper member having a portion spaced from said base portion providing a surface facing said base portion and inclined with respect thereto for engagement by said surface on said latching portion of said third latch member when said shaft is turned in said one direction.

2. A door control mechanism for securing a swinging door in closed position, said mechanism comprising a shaft, bearing members adjacent to opposite ends of said shaft adapted to rotatably connect said shaft to a swinging door with its axis of rotation spaced from an parallel with the pivotal axis of the door, means for oscillating said shaft about its longitudinal axis, discrete latch members secured to said shaft adjacent to opposite ends thereof each having portions projecting generally in opposite directions transversely of said shaft, discrete keeper members adapted to be secured to structure adjacent to opposite edge portions of the door that extend transversely to the pivotal axis of the door each having a base portion and spaced portions projecting said shaft is turned in said one direction, a third discrete latch member connected to said shaft intermediate its ends for pivotal movement about an axis substantially parallel with but offset from the axis of said shaft, said third latch member having a body portion and a latching portion adjacent to its non-pivoted end providing a surface facing one side of said body portion and said shaft and inclined away from said body portion and a projection on said one side of said body portion intermediate the ends of said third latch member having a part spaced from said body portion providing a surface facing said body portion, a discrete guide member adapted to be connected to the door intermediate the edge of the door opposite its pivotal axis and said shaft, said guide member having a portion adapted to be positioned between said body portion of said third latch member and said surface on said part of said projection on said one side of said body portion spaced from said body portion for limiting pivotal movement of said third latch member, and a third discrete keeper member having a base portion adapted to be secured to structure adjacent to the edge of the door opposite its pivotal axis, said third keeper member having a portion spaced from said base portion providing a surface facing said base portion and inclined with respect thereto for engagement by said surface on said latching portion of said third latch member when said shaft is turned in said one direction, said third latch member providing a surface facing in the same direction as said one side of said body portion of said third latch member faces for abutment with said third keeper member upon rotation of said shaft in the direction opposite said one direction.

Claims

1. A door control mechanism for securing a swinging door in closed position, said mechanism comprising a shaft, bearing members adjacent to opposite ends of said shaft adapted to rotatably connect said shaft to a swinging door with its axis of rotation spaced from and parallel with the pivotal axis of the door, means for oscillating said shaft about its longitudinal axis, discrete latch members secured to said shaft adjacent to opposite ends thereof each having portions projecting generally in opposite directions transversely of said shaft, discrete keeper members adapted to be secured to structure adjacent to opposite edge portions of the door that extend transversely to the pivotal axis of the door each having a base portion and spaced portions projecting from said base portion for engagement with said projecting portions of said latch members when said bearing members are secured to said door and said keeper members to said structure and said shaft is turned in one direction, one of said portions projecting from said base portion of each of said keeper members having a portion spaced from said base portion providing a surface facing said base portion for engagement by one of said projecting portions of said latch members when said shaft is turned in said one direction, a third discrete latch member connected to said shaft intermediate its ends for pivotal movement about an axis substantially parallel with but offset from the axis of said shaft, said third latch member having a body portion and a latching portion adjacent to its non-pivoted end providing a surface facing one side of said body portion and said shaft and inclined away from said body portion and a projection on said one side of said body portion intermediate the ends of said third latch member a part spaced from said body portion providing a surface facing said body portion, a discrete guide member adapted to be connected to the door intermediate the edge of the door opposite its pivotal axis and said shaft, said guide member having a portion adapted to be positioned between said body portion of said third latch member and said surface on said part of said projection on said one side of said body portion spaced from said body portion for limiting pivotal movement of said third latch member, and a third discrete keeper member having a base portion adapted to be secured to structure adjacent to the edge of the door opposite its pivotal axis, said third keeper member having a portion spaced from said base portion providing a surface facing said base portion and inclined with respect thereto for engagement by said surface on said latching portion of said third latch member when saId shaft is turned in said one direction.

2. A door control mechanism for securing a swinging door in closed position, said mechanism comprising a shaft, bearing members adjacent to opposite ends of said shaft adapted to rotatably connect said shaft to a swinging door with its axis of rotation spaced from an parallel with the pivotal axis of the door, means for oscillating said shaft about its longitudinal axis, discrete latch members secured to said shaft adjacent to opposite ends thereof each having portions projecting generally in opposite directions transversely of said shaft, discrete keeper members adapted to be secured to structure adjacent to opposite edge portions of the door that extend transversely to the pivotal axis of the door each having a base portion and spaced portions projecting from said base portion for engagement with said projecting portions of said latch members when said bearing members are secured to said door and said keeper members to said structure and said shaft is turned in one direction, one of said portions projecting from said base portions of each of said keeper members having a portion spaced from said base portion providing a surface facing said base portion for engagement by one of said projecting portions of said latch members when said shaft is turned in said one direction, a third discrete latch member connected to said shaft intermediate its ends for pivotal movement about an axis substantially parallel with but offset from the axis of said shaft, said third latch member having a body portion and a latching portion adjacent to its non-pivoted end providing a surface facing one side of said body portion and said shaft and inclined away from said body portion and a projection on said one side of said body portion intermediate the ends of said third latch member having a part spaced from said body portion providing a surface facing said body portion, a discrete guide member adapted to be connected to the door intermediate the edge of the door opposite its pivotal axis and said shaft, said guide member having a portion adapted to be positioned between said body portion of said third latch member and said surface on said part of said projection on said one side of said body portion spaced from said body portion for limiting pivotal movement of said third latch member, and a third discrete keeper member having a base portion adapted to be secured to structure adjacent to the edge of the door opposite its pivotal axis, said third keeper member having a portion spaced from said base portion providing a surface facing said base portion and inclined with respect thereto for engagement by said surface on said latching portion of said third latch member when said shaft is turned in said one direction, said third latch member providing a surface facing in the same direction as said one side of said body portion of said third latch member faces for abutment with said third keeper member upon rotation of said shaft in the direction opposite said one direction.