US3402958A - Door or panel fastener - Google Patents

Description

P 24, 1968 I J. K. BARRY 3,402,958

DOOR OR PANEL FASTENEH Filed March 26, 1967 2 Sheets-Sheet 1 INVENTOR. JOHN K. BARRY ATTORNEYS p 24, 1968 J. K. BARRY v v 3,402,958

DOOR OR PANEL FASTENER Filed March 23, 1967 I 2 Sheets-$heet 2 I IO INVENTOR. JOHN K. BARRY WkM ATTORNEYS.

United States Patent 3,402,958 DOOR 0R PANEL FASTENER John K. Barry, Springfield, Pa., assignor to Southco, Inc., Lester, Pa., a corporation of Delaware Filed Mar. 28, 1967, Ser. No. 626,604 6 Claims. (Cl. 292-62) ABSTRACT OF THE DISCLOSURE A rotary operated latch is disclosed having a cam action in the lever or handle providing a pull-up on the pawl to compress the door or panel against the frame or gasket to provide a tight seal. An over-center action prevents accidental release. The latch has a positive feel providing an indexing signal that the latch has been rotated 90 from the latched to the unlatched position (or vice-versa) with automatic or self-alignment. A tamper-proof feature is also disclosed.

Background of the invention This invention relates to door or panel fasteners of the type adapted to be mounted along the edges of doors or panels which overlap a wall or frame. The fastener has a latching finger or pawl which is swingable over the inside frame of the dooror panel-opening to lock the panel against the frame.

Description of the prior art The fastener disclosed in the present application constitutes an improvement over Barry et a1. Patent 2,860,904, and over Barry Patent 3,302,964.

Summary of the invention The latch disclosed in the present application has several improvements or features not found in the latches of the prior art. In the first place, the latch of the present application is so designed that accidental release is prevented. Secondly, a positive feel is provided signalling that the latch has been rotated 90 from the latched to the unlatched position, or vice-versa. Thirdly, automatic or selfalignment is provided so that the lever may be properly depressed to cam the pawl in the direction of the panel and provide the type of closure that is desired. Fourthly, the latch has a feature which makes it tamper-proof, in that when used with a lock in which the locking position is the DOWN position, the handle cannot be separated from the shaft without leaving evidence that such separation has occurred. This feature is important when the latch is used on large shipping or cargo containers to seal access doors and panels. If unauthorized access to the container through these panels is attempted, evidence that such attempt has been made is there for the inspector to see. Lastly, the general design of the handle and square-headed sleeve is such that the camming surface of the handle and the mating surface of the sleeve are protected from dirt and weather and are concealed from view to improve the overall appearance of the latch and to disguise the method by which the fastener is operated when the handle is down and locked, thereby to discourage tampering with the latch.

Brief description of the drawing FIG. 1 is an exploded assembly view of the new latch;

FIG. 2 is a plan view of the latch with handle down in latched position;

FIG. 3 is an enlarged elevational view, partly in section, along the line III-III of FIG. 2;

FIG. 4 is a partial view, in section, showing the handle partly raised from the DOWN or latched position;

FIG. 5 is a partial view, in section, showing the handle in the UP or unlatched position;

3,402,958 Patented Sept. 24, 1968 FIG. 6 is an elevational view of unlatched position; i 1

FIG. 7 is a view, in section, along the line VII-VII of FIG. 6, showing in dot-and-dash line the position of the handle mid-way between the unlatched and latched position;

FIG. 8 is a partial elevational view of a modified form of latch the handle of which has a central web, adapted for padlock latching; and 1 FIG. 9 is a view, in section, along the line IXIX of FIG. 8. 1

Description of the preferred embodiment Referring now to the drawings, the latch assembly is shown to include a lever or handle 10, ascrew 20, and asleeve 30.Reference numeral 50 identifies a portion of a door or panel having ahole 51 therein into which thescrew 20 andsleeve 30 are inserted. Thehole 51 is of a size and shape corresponding to that ofsleeve 30. To prevent rotation ofsleeve 30 in thehole 51, both thesleeve 30 and thehole 51 are provided with opposing flat sides, identified by the reference numeral 34 for the sleeve and 54 for the hole.

Apawl 40 is provided having therein a hole 41 of a size and shape to receive theshank 23 of thescrew 20. To allow axial rotation of the screw 20 (as by the handle 10) to move thepawl 40 rotationally, both the hole 41 in thepawl 40 and theshank 23 of thescrew 20 are provided with flat sides, identified by the reference numeral 44 for the pawl and 24 for the screw.

Theinward end portion 31 ofsleeve 30 is externally threaded for receiving anut 38 whose function is to hold the latch assembly tightly against the door orpanel 50. A pair ofnuts 42 and 43 are threaded on the externally threadedshank 23 of thescrew 20. Their function is to lock thepawl 40 in its desired position on thescrew 20.

Thescrew 20 has an enlargednonthreaded center portion 22 of a diameter adapted to be received by the larger bore of thesleeve 30, at the inward or lower end of the sleeve. The outward or head end of thesleeve 30 has abore 36 of smaller diameter, forming between the smaller and larger bores theannular shoulder 35. The nonthreaded upper orhead end 21 ofscrew 20 is of reduced diameter, relative to thecenter portion 22, and is of a size corresponding to that of the smaller 'bore 36 ofsleeve 30. Ahelical spring 37 is placed within the sleeve 30', one end of thespring 37 abutting against theshoulder 35 and the other end abutting against theshoulder 29 formed by the enlargedcenter portion 22 ofscrew 20. Thus,spring 37 exerts a thrust against thescrew 20 which tends to move thescrew 20 inwardly. The extent to which thespring 37 is able to move the screw inwardly is dependent upon, and controlled by, thelatch handle 10, as will be described.

Handle 10 is secured pivotally to the head end of screw 20 :by apin 25, which, in a preferred form, is held and the latch assembly in supported by a pair of opposed T-shaped bushings 26 and 27. When thebushings 26 and 27, having narrow body and enlarged head, are pressed into thehandle 10, flush with the surface of the handle, the bushings cannot be pushed through the handle, and cannot be withdrawn from the handle, without damage to the handle. This design not only provides a tamper-proof feature for the handle to screw assembly but also provides an excellent bearing surface for thepin 25 about which the handle 10 pivots and reduces wear. The design also provides a pleasing appearance to the finished assembly.

Thescrew 20 is movable rotatably and slidably, relative to thesleeve 30, by thehandle 10. Thecoil spring 37 hearing against theshoulder 35 at one end of the sleeve cavity and againstshoulder 29 on thescrew 20 at the other end, exerts a thrust which keeps the handle and thesleeve 30 in constant contact, as will become clear as the description proceeds.

Sleeve 30 has asquare head 32 above which rises aconical section 33, the slope of which may preferably be 30.

The head end ofhandle 10, in which pivot pin is mounted, is hollow having a generally rectangular cavity therein which is closed on four sides but is open in the inward and upward directions when the handle is in the DOWN position, as shown in FIG. 1. Mounted within the handle cavity, and shrouded by the side walls of the cavity (which extend beyond the cam members) are two square cam members 16 and 17, each having camming surfaces, identified by the suffixes a and b, at right angles to each other, the corner or junction therebetween being slightly rounded. Surfaces of cam members 16 and 17 tend to be in constant touch with the top flatannular bearing surface 39 of theconical section 33 of sleeve due to the thrust developed by thecoil spring 37 through thescrew 20 to which thehandle 10 is pinned. When thehandle 10 is pivoted about thepin 25, surfaces of cam members 16 and 17, by bearing on thebearing surface 39 of thesleeve 30, cause thescrew 20 to move axially outward through thesleeve 30, thereby allowing a compressive force to be applied through the pawl to pull the panel tightly against the frame or gasket 51.

The sides of thehandle 10, extending beyond the cam members 16 and 17, fit closely around three sides of thesquare head 32 at the head end of thesleeve 30 when thehandle 10 is in the DOWN or latched position. When in this position, the extending sides of the handle function like an open-ended end wrench, and prevent rotation of thehandle 10 so long as it is in the DOWN position.

As mentioned above,sleeve 30 has aconical section 33, preferably 30, which rises from thesquare head 32 on the head of the sleeve. The diameter of theconical section 33 at the base of the cone is larger than the width across thesquare head 32, and that part of the cone which would otherwise extend beyond thesquare head 32 is cut away, leaving the flat surfaces 133, one of which is seen in FIG. 1. The diameter of thecone 33 at the base is also larger than the inner dimension between opposed extended side walls of thehandle 10. When thehandle 10 is raised to the UP or cam away position, the extended sides of the handle fit closely to, but do not extend down over the flat edges of thesquare head 32 of thesleeve 30. As a result of the structure and relative dimensions just described, when thehandle 10 is raised to the UP position, shown in phantom in FIG. 3, and then rotated (relative to the axis of screw 20) to swing thepawl 40 from the latched toward the unlatched position (or vice-versa), the o posed extended sides of thehandle 10 are cammed up by theconical surface 33 of thesleeve 30. This is illustrated in FIG. 7. This outward movement ofhandle 10 pullsscrew 20 outward relative tosleeve 30 and compresses thespring 37. This outward movement ofhandle 10 lifts the cam members 16 and 17 away from the top flatannular bearing surface 39 of thesleeve 30 until the extended sides of the handle encounter a diameter on the sloping surface of thecone 33 equal to the inner dimension between the said extended sides. When this diameter is reached, the lifting action ceases, and the extended sides of the handle thereafter rotate about thecone 33, all the while bearing down upon the sloping wall of thecone 33 under the action of the thrust of thespring 37. This continues, as the operator continues to turn thehandle 10 until, upon completion of 90 of rotation, the extended sides of thehandle 10 meet the flattened portions 133 of thecone section 33 and again mate with the fiat sides of thesquare head 32 of thesleeve 30. At this position, the extended sides of the handle are clear of the edges of thesquare head 32, and thehandle 10, under the urging of thespring 37, snaps inward or downward until the came surfaces 16 and 17 of thehandle 10 again encounter the fiat top annular bearingsurface 39 of thesleeve 30. The handle is now exactly oriented in the unlatched (or latched) position 90 distant from the position where rotation began. This action not only correctly positions thepawl 40, retaining it in this position against axial movement, but it also aligns thehandle 10 so that the extended sides will nest properly around thesquare head 32 of thesleeve 30 when the handle is pressed into the DOWN or cam in position, to complete the panel latching action.

It will be understood that when thehandle 10 is raised from the DOWN or latched position to the UP or unlatched position (or vice-versa) the camming action of the cam members 16 and 17 on the bearingsurface 39 ofsleeve 30 occurs. During this camming action, a point is reached where the junction of camming sunfaces 16a and 16b, and the junction ofcamming surfaces 17a and 17b are in line with the center axis ofpivot pin 25. This point is the top dead center position of the two 90- displaced cam surfaces a and b of cam members 16 and 17. On either side of this dead-center point, the thrust from thespring 38 creates a force moment, and as a result thescrew 20 is urged inwardly, and handle 10 moves in the direction from top dead center to which it is displaced. This provides an over-center action in both directions and as a result thehandle 10 in DOWN position tends to stay down, and in UP position tends to stay up. Thus, handle 10 cannot vibrate open. It cannot fall into the opposite position from which it is placed without overcoming an increase in force, as the spring moves to maximum load position when thehandle 10 moves through the dead center position.

The camming surfaces 16b and 17b of cam members 16 and 17, and the sides of the holder which extend beyond these surfaces, are more distant from the center axis ofpivot pin 25 than are theother camming surfaces 16a and 17a and the other side walls. Thus, when the handle is in the DOWN position, as shown in solid line in FIG. 3, and the camming surfaces 16b and 1712 are bearing against theannular bearing surface 39 of thesleeve 30, the side walls of the holder embrace thesquare head 32 of the sleeve andpin 25 is more remote from thepanel 50. Thepawl 40 is then in the position showvn in solid line in FIG. 3. This is the latched position. When thehandle 10 is raised to the UP position, as shown in phantom in FIG. 3, the nearer-to-the-pin camming surfaces 16a and 17a bear against the bearingsurface 39 of thesleeve 30, the side walls of the holder do not embrace thesquare head 32 of the sleeve, and thepivot pin 25 takes the position shown in phantom in FIG. 3. This position ofpin 25 is substantially closer to thepanel 50, and thescrew 20 andpawl 40 move to the inward positions shown in phantom in FIG. 3. This is the unlatching position of the pawl, from which the pawl is turned angularly 90 by thehandle 10.

Before referring to a modification illustrated in FIGS. 8 and 9, the illustrations in FIGS. l-7 Will be briefly reviewed. FIG. 1 is an exploded view of the latching assembly, and includes a portion of a panel 50'. In FIG. 1, the handle is shown in the DOWN or latched position. FIG. 2 is a plan view of the latch, the handle being down in the latched position. FIG. 3 is a side view of the latch, enlarged, and in section. FIG. 4 shows the handle in between the latched and unlatched positions. FIGS. 5 and 6 show the handle in UP or unlatched position. FIG. 7 shows, in phantom, the handle rotated (axially relative to the axis of the screw 20) to bring out how the sides of the handle cavity are cammed up on theconical section 33 of thesleeve 30 as the handle is rotated to rotate the pawl.

FIGS. 8 and 9 illustrate a slight modification which adapts the latch for padlock locking. The latching mechanism in FIGS. 89 is the same as has already been described with respect to FIGS. 1-7, but thehandle 10 is provided with acenter web 18 having a hole 19 therethrough. A bracket having a pair ofapertured prongs 61, 62 is secured, as by rivets, to thepanel 40 in such position, relative to the latch, that when the handle is in the DOWN position, the hole 19 in theweb 18 is in alignment with the holes in theprongs 61, 62 of thebracket 60. Thepadlock 65, shown in phantom, is then inserted, as illustrated.

Other configurations than those shown and described could, of course, be used. For example, thebushings 26 and 27 for pin need not have the enlarged head, thehandle 10 could be differently shaped or proportioned, thesleeve 30 could be differently proportioned, and thespring 37 could be outside thesleeve 30 and bear on one of the nuts 42, 43. Other modifications within the scope and spirit of the appended claims will occur to those skilled in the art.

What is claimed is:

1. A latch assembly having a pull-up action for developing a compressive force between two closure members which are to be pressed together, said latch assembly comprising:

(a) a sleeve adapted to project through a hole in one of said closure members and to be secured nonrotatably therein, said sleeve having a square head and a frusto-conical cap on said square head, the diameter at the base of said conical cap being larger than the diameter of the square head, the portion of said conical cap which would otherwise project beyond said square head being cut off, the outward surface of said cap forming a fiat annular bearing surface;

(b) a screw through said sleeve and movable axially and rotatably with respect thereto, said screw having a head portion extending outwardly beyond said sleeve and a threaded shank section extending inwardly beyond said sleeve, said inwardly extending shank being adapted to support a pawl for inward and outward movement with said screw and for angular movement with said screw;

(c) a handle piwotally pinned by a pivot pin to the outwardly extending head portion of said screlw, said handle having a generally rectangular cavity through which the pivot pin passes;

(d) a pair of rectangular cam members within said cavity, one on each side of the screw head, said cam members secured to the side walls of said handle, said pin passing through said side walls of the handle and through the cam members substantially closer to one edge of each than to the edge at right angles thereto, one or the other edges of said cam members tending to bear against the flat annular bearing surface of said conical cap, the side walls of said handle which define said cavity extending beyond said cam members;

(e) said pivot pin being so located relative to said camming edges and to the side walls of said handle that when the ca m edge which is more remote from said pin is against said flat annular bearing surface the side walls of said handle embrace the square head of said sleeve to prevent angular rotation of said handle;

(f) said pivot pin being so located that when the cam edge which is nearer to said pin is against said bearing surface the side walls of said head clear the square head of said sleeve so that said handle may be rotated relative to the axis of said pin to rotate said screw axially, thereby to turn said pawl angu:

larly;

(g) the extending edges of the side walls of said handle being cammed up on said conical cap away from said square head when said handle is rotated; and

(h) resilient means urging said handle to return toward said square head and effective to pull said handle theretoward upon completion of angular rotation.

2. A latch according to claim 1 characterized in that said conical cap has a slope of the order of 30.

3. A latch according to claim 1 characterized in that:

(a) said sleeve has a smaller bore at the outward end and a larger bore at the inward end, rfionming an annular shoulder therebet'ween;

(b) said screw has a center section within said sleeve which is larger in diameter than the head portion of said screw, forming a shoulder therebetween;

(c) said resilient means is a coil spring disposed between said sleeve shoulder and said screw shoulder, said spring tending to thrust said screw inwardly.

4. A latch according to claim 3 characterized in that the ends of said pivot pin are supported in said handle in a pair of bushings.

5. A latch according to claim 4 characterized in that said conical cap has a slope of the order of 30.

6. A latch according to claim 1 characterized in that said handle, beyond the cavity portion, is provided with a web portion having an aperture therethrough for receiving the shackle of a padlock, said latch being adapted to cooperate 'with a fixed bracket on said one closure member to effect locking said closure members together.

References Cited UNITED STATES PATENTS 1,193,148 8/1916 Hornung 29257 1,229,851 6/ 1917 Abercrombie 29257 2,886,105 5/1959 Lee 29259 X 2,860,904 11/1958 Barry et al 29257 X 3,302,964 2/1967 Barry 29257 MARVIN A. CHAMPION, Primary Examiner.

JOHN R. MOSES, Assistant Examiner.

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