US3221805A - Self-locking hinge - Google Patents

Description

Dec. 7, 1965 w. E. MILLER 3,221,805

SELFLOCKING HINGE Filed July 22, 196s fAWZr: J- 34 57 sa 10 f3?) )35 (52 2 fi/2330 mum/6MM @nerr .A1/44e@ Ivre/wrap.

United States Patent O 3,221,805 SELF-LOCKING HINGE Wellington Everett Miiler, Garden Grove, Calif., assigner to Penberhy Lumber Company, Los Angeles, Calif., a corporation of California Fiied July 22, 1963, Ser. No. 296,551 4 Ciaims. (Cl. 16B-229) The present invention relates in general to hinge means for hingedly connectible members and, more particularly, to a self-locking hinge assembly comprising at least two hinges having hinge pins which are normally axially aligned to provide a common hinge axis, but which may be misaligned to prevent any hinging action about such hinge axis, the provision of such a self-locking hinge assembly being a primary object of the invention.

A more specific and important object of the invention is to provide a self-locking hinge assembly for a pair of hingedly connectible members comprising: at least two spaced hinges each including hinge elements respectively connectible to the hingedly connectible members; each of the hinges including a hinge pin pivotally interconnecting the hinge elements thereof; the hinge pins normally being axially aligned to provide the hinges with a common hinge aids about which the hinge elements of the hinges may pivot between open and closed positions; one of the hinges including bearing elements respectively connected to the hinge elements thereof and providing a locking axis which is perpendicular to the hinge axis and about which said one hinge is pivotable, when the hinge elements of said one hinge are in their closed positions, to misalign the hinge pins; thereby preventing relative pivotal movement of the hingedly connectible members when they are connected to the hinges; and locking means connected to one of the bearing elements for pivoting said one hinge about the locking axis into a position to misalign the hinge pins.

With the foregoing construction, the desired locking action is achieved by pivoting only one of the hinges of the assembly or set into a misaligned position about a locking axis perpendicular to the common hinge axis. However, all of the hinges of the set may be made pivotable into misaligned positions. With such a construction, each hinge would be pivotable about its own locking axis perpendicular to the common hinge axis and all of the locking axes would be parallel.

Another object is to provide a construction wherein at least one bearing element of each misalignable hinge is a shaft pivotable about the corresponding locking axis, the locking means being connected to such shaft and comprising a locking lever, or other means for pivoting the shaft about its locking axis.

Another object is to provide a hinge assembly wherein each hinge includes joint breaking means for biasing the hinge elements of such hinge toward their open positions. More particularly, an object in this connection is to provide a misalignable hinge provided with bearing elements which are pivotable about a locking axis and at least one of which is a tubular shaft connected to one of the hinge elements of such hinge and containing a joint breaking pin engageable with the other hinge element to bias the hinge elements toward their open positions when they are in their closed positions, the tubular shaft containing spring means for biasing the joint breaking pin into engagement with the hinge element on which it acts.

The present invention may be applied to various hingedly connectible members, such as an ordinary door and door jamb, or the like. However, the invention finds particular utility in keeping a folding panel assembly at when such assembly is extended, and will be considered in such connection hereinafter for convenience. It will Patented Dec. 7, 1965 be understood that the invention is applicable to various types of folding panel assemblies, such as folding shutters, folding room dividers, and the like. Sucha folding panel assembly may include two or more folding panels.

An important object of the invention in connection with a folding panel assembly is to hingedly interconnect the panels and a supporting structure, such as a jamb, by means of two spaced, parallel hinge assemblies which traverse the desired hinge axes of the panel assembly and at least one of which includes: a series of shafts axially alignabie along a locking axis perpendicular to the hinge axes; a series of hinges respectively pivotally interconnecting adjacent ends of the shafts and respectively having hinge pins lying on the hinge axes; the hinges respectively including hinge elements pivotable from open positions to closed positions to axially align the shafts along the locking axis; and a locking lever connected to an end shaft of the series for pivoting the series of shafts and hinges about the locking axis when the shafts are axially aligned therealong. With this construction, the hinge pins of the pivotable series of hinges are angularly displaced relative to the hinge axes to prevent hinging of the panels of the panel assembly relative to each other and relative to the panel-assembly jamb, or other panel-assembly supporting structure.

Another object is to provide the panel assembly with two series of misalignable hinges to better hold the panel assembly flat when extended.

Another object is to provide a self-locking hinge assembly, comprising a series of misalignable hinges, wherein alternate ones of the hinge pins are laterally offset to opposite sides of the corresponding locking axis. With this construction, the panels of a folding panel assembly with which the self-locking hinge assembly is used are brought into edge-abutting relation with each other, and with the panel-assembly jamb, when the panel assembly is extended.

Another object of the invention in the foregoing connection is to provide a self-locking assembly, comprising a series of misalignable hinges, which may be oriented in either of two positions angularly spaced 180 apart, thereby reversing the lateral offsets of the respective hinge pins from the corresponding locking axis. With this construction, the invention may be utilized to cause the joints of a folding panel assembly to break either way.

Another object is to provide a construction wherein the hinges forming a particular hinge axis may be rotated through angles of into positions such that the hinge pins thereof are all parallel and extend in the same direction, thereby permitting ready separation of the hinge elements thereof in a manner to be explained in more detail hereinafter. This construction permits easy assembly and disassembly of folding panel structures, for example.

The foregoing objects, advantages, features and results of the present invention, together with various other objects, advantages, features and results thereof which will be evident to those skilled in the hinge art in the light of this disclosure, may be achieved with the exemplary embodiments of the invention described in detail hereinafter and illustrated in the accompanying drawing, in which:

FIG. l is a front elevational view showing, on a reduced scale, an illustrative application of two self-locking hinge series -of the invention to an exemplary folding panel assembly;

FIG. 2 is a fragmentary perspective View showing two self-locking hinge series of the invention in locked positions, i.e., with the hinge pins of the corresponding hinges in the two series misaligned;

FIG. 3 is an enlarged sectional view taken along the arrowed line 3 3 of FIG. 2;

FIG. 4 is a view similar to FIG. 2, but showing the two hinge series in unlocked positions, i.e., showing the hinge pins of corresponding hinges aligned, and showing the hinges in partially open positions;

FIG. 5 is an enlarged sectional view taken along the arrowed line 5 5 of FIG. 4;

FIG. 6 is an enlarged, fragmentary, longitudinal sectional view through a self-locking hinge series of the invention; and

FIG. 7 is a fragmentary perspective view showing an alternative self-locking hinge of the invention.

Referring to FIG. l of the drawing, illustrated therein for the purpose of disclosing one application of the invention is a fol-ding shutter assembly 16 set in a window opening 12. In the particular construction shown, the folding shutter assembly includes a jamb 22 and three foldable shutter panels 24, 26 and 28. The j arnb 22 and the panels 24, 26 and 28 are interconnected for folding movement of the panels relative to the jamb, about parallel hinge axes, -by two spaced, parallel, self-locking hinge assemblies or series 30 and 30a of the invention, the two hinge series traversing the folding panel assembly 19 adjacent the upper and lower edges thereof in the particular construction illustrated.

More particularly, the panel 24 is pivotally connected to the jamb 22 by hinges 33 and 33a, the panel 26 is pivotally connected to the panel 24 by hinges 35 and 35a, and the panel 28 is pivotally connected to the panel 26 by hinges 37 and 37a,

When the folding panel assembly 10 is extended so that it is in a attened condition, the various components of each hinge series 30 and 30a are all axially aligned, as suggested in FIG. 2 of the drawings, and are pivotable relative to the flattened panel assembly about the longitudinal axis thereof, the longitudinal axes of the hinge series 30 and 30a, when in their straightened positions, being referred to hereinafter as their locking axes. Pivotal movement of the straightened hinge series 30 and 30a about their locking axes is permitted by bearing elements 32 and 32a journalled in the jamb 22, bearing elements 34 and 34a journalled in the panel 24, bearing elements 36 and 36a'journalled in the panel 26, and bearing elements 38 and 38a joumalled in the panel 28.-

The bearing elements 32 and 32a are -connected to the hinges 33 and 33a, respectively, and are preferably stub shafts suitably journalled in the jamb 22, as suggested in FIG. 6, in a manner to prevent axial withdrawal from the jamb. In other words, the stub shafts 32 and 32a are journalled in and suitably keyed to bearings carried by the jamb 22, again as suggested in FIG. 6, so that they support the other components of the hinge series 30 and 30a and the panels 24, 26 and 28 `carried thereby. Any suitable keyed bearing construction, or other means of mounting the hinge series 30 and 30a on the jamb 22 for pivotal movement about their locking axes, may be utilized. Consequently, a further description herein is not believed to be necessary.

The bearing element 34 is rigidly connected at its ends to the hinges 33 and 35, the bearing element 34a is rigidly connected at its ends to the hinges 33a and 35a, the bearing element 36 is rigidly connected at its ends to the hinges 3S and 37, the bearing element 36a is rigidly connected at its ends to the hinges 35a and 37a, the bearing element 38 is rigidly connected at its ends to the hinge 37 and a locking means 39, and the bearing element 38a is rigidly connected at its ends to the hinge 37a and a locking means 39a.

The bearing elements 34, 34a, 36, 36a, 38 and 38a are all tubular shafts for a reason to be explained hereinafter, These tubular shafts may be suitably journalled in the corresponding panels, as by being disposed in grooves therein. For example, the panel 26 is shown as having a groove 27a for the tubular shaft 36a. The latter may be heldin its groove in any suitable manner, as by a filler strip, not shown.

In the embodiment under consideration, the locking means 39 and 39a are shown as located at the leading edge of the leading panel 28, and include locking levers 40 and 40a for pivoting the hinge series 30 and 30a about their locking axes, when the hinge series are straightened, between locked and unlocked positions, as will be discussed in more detail hereinafter. However, the locking means may also be secured to the stub shafts 32 and 32a. As suggested in FIG. 1, the locking levers 40 and 40a are engageable with the front surface of the panel 28 in the locked and unlocked positions of the hinge series 36 and 30a, thereby preventing pivotal movement of these hinge series beyond their locked and unlocked positions. The reason for this will be explained hereinafter.

Each of the various hinges 33, 33a, 35, 35a, 37 and 37a includes two hinge elements each rigidly connected to the adjacent one of the shafts 32, 32a, 34, 34a, 36, 36a, 38 and 38a. For example, FIG. 6 shows the hinge 37 las including hinge elements 41 and 42 respectively rigidly connected, as by welding, or otherwise, to the adjacent ends of the shafts 36 and 38. The various other shaft-to-hinge connections are similar so that a `detailed description is not necessary. The locking means 39 and 39a are respectively rigidly, but removably, connected to the outer ends of the shafts 38 and 38a in any suitable torque-transmitting manner. For example, as shown in FIG. 6, the outer end 61 of the shaft 38 is illustrated as hexagonal and as tting into a complementary socket in the locking means 39, the latter being retained by a screw 43. A similar locking-means-to-shaft connection may be utilized between the locking means 39a and the shaft 38a.

Each of the various hinges 33, 33a, 35, 35a, 37 and 37a includes, in addition to the two hinge elements hereinbefore discussed, a hinge pin pivotally interconnecting such hinge elements for relative movement ybetween rst Iand second positions. (With the particular hinge construction shown, these rst and second positions are conveniently designated as open and closed positions, but merely for reference purposes.) FIG. 3 shows the hinge 37 as including a hingle pin 44 rigidly connected to the hinge element 41 and withdrawably extending into a hinge pin opening 45 in the hinge element 42. FIG. 3 also shows the corresponding components of the hinge 37a, these being identified by reference characters differing by the addition of the suffix a.

As shown in FIGS. 4 and 5 of the drawing, when it is desired to extend or retract the folding panel assembly 1t), the locking levers 4t). yare in positions such that the axes of the hinge pins 44 and 44a of the hinges 37 and 37a are aligned, the same being true of the axes of the hinge pins of the hinges 35 and 35a, and of the axes of the hinge pins of the hinges 33 and 33a. The common hinge axis of the hinges 37 and 37a is designated in FIGS. 4 and 5 by the broken line 37b, and the common hinge :axis of the hinges 35 and 35a is indicated in FIG. 4 by the broken line 35h. (The common hinge axis for the hinges 33 and 33a is not specifically shown.)

Thus, under the foregoing conditions, the panels 24, 26 and 28 are free to be folded into their retracted positions, or unfolded into their extended positions. As suggested in FIG. 4, alternate ones ofthe common hinge axes of the hinge pairs 33-33a, 35-35a and 37-37a are laterally offset to opposite sides of the locking axes of the hinge series 30 and 30a, these common hinge axes all being perpendicular to the locking axes. More particularly, as best shown in FIG. 5, the common hinge axis 37b is offset to one side of the locking axes. The common hinge axis 35b, FIG. 4, is offset to the opposite side thereof, and the common hinge axis of the hinges 33 and a is offset to the same side as the common hinge axis 37b. Laterally offsetting alternate ones of the common hinge axes to opposite sides of the locking axes in this manner provides for positioning the panels 24, 26 1and 28 in edge abutting relation when the folding panel assembly is extended.

An important feature of the present invention in connection with the foregoing alternate lateral offset is that it may be reversed merely by angularly displacing the two hinge series 30 and 39a through angles of 180 from the positions shown. This may be accomplished readily by removing the two locking means 39 and 39a, rotating the two hinge series 30 and 30a through 180, and replacing the two locking means. Thus, the present invention provides for folding of the panels 24, 26 and 28 in opposite directions. The particular direction of folding may be selected at the time of installation, or it may later be reversed.

When it is desired to lock the folding panel assembly 10 at in its extended position, this can be done very sirnply by pivoting the hinge series 30 and 30a about their locking axes into the positions shown in FIGS. 2 `and 3 of the drawing. Under these conditions, the hinge pins of each pair of hinges are misaligned, as illustrated by the misaligned hinge pins 44 and 44a in FIG. 3. Consequently, the hinges 33, 33a, 35, 35a, 37 and 37a cannot break, with the result that the hinge series 3ft and 36a are positively locked in their straightened conditions, to positively hold the extended panel assemblylt) perfectly flat, which is an important feature of the invention. In pivoting the hinge series 39 and 30a into their locked positions, they are preferably pivoted through substantial angles for best results. However, for a reason which will be explained hereinafter, these anglesv are preferably limited to less than 90 by engagement of the locking levers 40 and 49a with the front surface of the panel 28.

It will be understood that while both hinge series 3G and 30a have been shown as pivotable into locking positions, a similar effect may be achieved by making only one of the hinge series, e.g., the series 30, pivotable in this. fashion. In such event, individual hinges, not shown, might be substituted for the interconnected hinges 33a, 35a and 37a. Preferably, however, both of the hinge series 30 and 30a are pivotable into locked positions to better hold the panel assembly 10 at in its extended position.

While separately operable locking levers 40 and 49a have been shown, it will be understood that they may be suitably interconnected to provide for simultaneous pivoting of the hinge series 30 and 30a between their locked and unlocked positions.

Considering another feature of the present invention, when the two hinge series 3i) and 30a are in their unlocked positions, the aligned hinge pins of each pair face in opposite directions. This is shown in FIG. 5 in connection with the hinge pins 44 .and 44a. As will be apparent, since the hinge pins 44 .and 44a extend in opposite directions, they cannot be withdrawn from their respective hinge pin openings 45 and 45a. More particularly, keeping in mind that the two hinge series 36 and 30a are maintained a iixed distance apart by the panels 24, 26 and 28, it will be apparent that as long as the hinge pins. 44 and 4a extend in opposite directions the hinge elements 41 and 41a cannot be -moved relative to the hinge elements 42 and 42a to withdraw the hinge pins 44 and 44a from their openings 45 and 45a (nor can the hinge elements 42 and 42a be moved relative to the hinge elements 41 and 41a to effect such withdrawals).

However, by removing the two locking means 39 and 39a to prevent the locking levers 40 and 40a from engaging the front surface of the panel 2S and thus acting as stops, the hinges 37 and 37a can be rotated beyond their locked positions, in the directions indicated by the arrows in FIG. 3, into positions wherein the hinge pins 44 and 44a extend in the same direction and are parallel. As will be apparent, it is necessary to pivot the two hinge series 90, in opposite directions, from their unlocked positions to achieve this. Now, the hinge elements 41 and 41a can be separated laterally from the hinge elements 42 and 42a merely by withdrawing the hinge pins 6 44 and 44a from the respective hinge pin openings 45 and 45a, thereby separating the panel 28 from the panel 26. This provides a very simple way of assembling and disassembling the panels, which is an important feature.

Another feature of the present invention is that it includes joint breaking means for biasing the hinge elements of the respective hinges toward their open positions. With this construction, when the two hinge series 30 and 30a are pivoted into their unlocked positions, the joint breaking means mentioned break the hinged joints between the jamb 22 and the various panels 24, 26 and 28 to facilitate folding of the panel assembly 10. There is a joint breaking means associated with each of the hinges 33, 33a, 35, 35a, 37 and 37a and disposed in the corresponding one of the tubular shafts 34, 34a, 36, 36a, 38 and 38a respectively.

The joint breaking means associated with the hinge 37 and disposed in the corresponding tubular shaft 33 is designated in FIG. 6 of the drawing by the numeral 50 and is illustrative of the joint breaking means associated with the other hinges and disposed in the corresponding other tubular shafts. The joint breaking means 5t) includes a joint breaking pin 51 axially reciprocable in the tubular shaft 38 and extending through an opening 49 in the hinge element 42 into engagement with the hinge element 41. A compression spring 52 coiled around the pin 51, and seated against a collar 53 on the pin 51, biases the pin into engagement with the hinge element 41 to bias this hinge element toward its open position relative to the hinge element 42. Consequently, whenever the hinge series 30 and 30a are in their unlocked positions, the spring 52 causes the pin 51 to break the joint between the panels 26 and 28 Which is represented by the hinge 37.

The particular configuration shown for the hinges 33, 33a, 35, 35a, 37 and 37a is dictated by functional and appearance considerations for the particular environment in which they are used. In other Words, the configuration of these hinges, in the environment illustrated, is selected to provide a desirable appearance, and to permit recessing the hinges into the panel edges, as shown in FIG. 1.

However, various hinge configurations may be used within the scope of the invention. For example, FIG. 7 shows a hinge 60 comprising a hinge pin 62 extending through collars 64, 66 and 68. The collars 64 and 68 are shown as interconnected by a yoke 70 which, in turn, is connected to a shaft 72 perpendicular to the hinge axis. The collar 66 has connected thereto a shaft 74 axially alignable with the shaft 72. When the shafts 72 and 74 are axially aligned, they provide a locking axis perpendicular to the hinge axis, and, in this case, intersecting the hinge axis, rather than being laterally oset therefrom. As will be apparent, if the hinge 60 is utilized in connection with a similar hinge, not shown, a hinging action may be achieved as long as the hinge-pin axes are aligned. However, by rotating the shafts 72 and 74, when these shafts are axially aligned, in the direction of the arrows, the axis of the hinge 60 may be misaligned with respect to the axis of the other hinge with which it is used. This provides a locking action similar to that hereinbefore disclosed.

Although exemplary embodiments of the invention have been disclosed herein for purposes of illustration, it will be understood that various changes, modifications and substitutions may be incorporated in such embodiments without departing from the spirit of the invention as defined by the claims which follow:

I claim:

1. In a self-locking hinge assembly for a pair of hingedly connectible members, the combination of:

(a) two spaced hinges each including hinge elements respectively connectible to the hingedly connectible members;

(b) each of said hinges including a hinge pin pivotally interconnecting said hinge elements thereof;

(c) said hinge pins normally being axially aligned to provide said hinges with a common hinge axis about which said hinge elements of said hinges may pivot between open and closed positions;

(d) one of said hinges including bearing elements respectively connected to Vsaid hinge elements thereof;

(e) said bearing elements of said one hinge being axially aligned, when said hinge elements of said one hinge are in their closed positions, to provide a locking axis which is perpendicular to said hinge axis and about which said one hinge is pivotable to misalign said hinge pins;

(f) thereby preventing relative pivotal movement of the hingedly connectible members when they are connected to said hinges; and

(g) locking means for pivoting said one hinge about said locking axis into a position to misalign said hinge pins.

2. In a self-locking hinge assembly for a pair of hingedly connectible members, the combination of:

(a) two spaced hinges each including hinge elements respectively connectible to the hingedly connectible members;

(b) each of said hinges including a hinge pin pivotally interconnecting said hinge elements thereof;

(c) said hinge pins normally being axially aligned to provide said hinges with a common hinge axis about which said hinge elements of said hinges may pivot between open and closed positions;

(d) one of said hinges including bearing elements respectively connected to said hinge elements thereof;

(e) said bearing elements of said one hinge being axially aligned, when said hinge elements of said one hinge are in their closed positions, to provide a locking axis which is perpendicular to said hinge axis and about which said one hinge is pivotable, when said hinge elements of said one hinge are in their closed positions, to misalign said hinge pins;

(f) thereby preventing relative pivotal movement of the hingedly connectible members when they are connected to said hinges;

(g) one of said bearing elements being a tubular shaft connected to one of said hinge elements of said one hinge;

(h) locking means connected to one of said bearing elements for pivoting said one hinge about said locking axis into a position to misalign said hinge pins;

(i) a joint breaking pin in said shaft and engageable with the other of said hinge elements of said one hinge to tend to pivot said hinge elements of said one hinge toward their open positions; and

(j) spring means in said shaft for biasing said joint breaking pin into engagement with said other hinge element of said one hinge.

3. In a self-locking hinge assembly for a pair of hingedly connectible members, the combination of:

(La) two spaced hinges each including two hinge elements respectively connectible to the hingedly connectible members;

((1a) each of said hinges including a hinge pin pivotally interconnecting said hinge elements thereof;

(c) said hinge pins normally being axially aligned to provide said hinges with a common hinge axis about which said hinge elements of said hinges may pivot between open and closed positions;

(d) each of said hinges including two shafts which are connected to said hinge elements thereof, respectively, and which are axially aligned when said hinge elements thereof are in their closed positions;

(e) said pairs of shafts respectively providing said hinges with parallel locking axes, when said hinge elements of said hinges are in their closed positions, which are perpendicular to said hinge axis and about which said hinges are pivotable to misalign said hinge pins;

(f) thereby preventing relative pivotal movement of the hingedly connectible members when they are connected to said hinges; and

(g) locking means connected to certain of said shafts for pivoting said hinges about said locking axes into positions to misalign said hinge pins.

4. A self-locking hinge assembly according to claim 3 wherein:

(a) each of said hinge pins is rigidly connected to one of said hinge elements of the corresponding hinge and removably extends into a hinge pin opening in the other;

(b) said hinge pins face in opposite directions when they are axially aligned along said hinge axis so as to prevent removal thereof from said hinge pin openings; and

(c) said hinges are pivotable about said locking axes in opposite directions through angles of so that said hinge pins are parallel and face in the same direction to permit simultaneous withdrawal thereof from said hinge pin openings.

References Cited by the Examiner UNITED STATES PATENTS 142,957 9/1873 Spiegel 16--165 2,178,908 11/1939 Hudson 16--164 HARRISON R. MOSELEY, Primary Examiner.

REINALDO P. MACHADO, Examiner.

Claims (1)

1. IN A SELF-LOCKING HINGE ASSEMBLY FOR A PAIR OF HINGEDLY CONNECTIBLE MEMBERS, THE COMBINATION OF: (A) TWO SPACED HINGES EACH INCLUDING HINGE ELEMENTS RESPECTIVELY CONNECTIBLE TO THE HINGEDLY CONNECTIBLE MEMBERS; (B) EACH OF SAID HINGES INCLUDING A HINGE PIN PIVOTALLY INTERCONNECTING SAID HINGE ELEMENTS THEREOF; (C) SAID HINGE PINS NORMALLY BEING AXIALLY ALIGNED TO PROVIDE SAID HINGES WITH A COMMON HINGE AXIS ABOUT WHICH SAID HINGE ELEMENTS OF SAID HINGES MAY PIVOT BETWEEN OPEN AND CLOSED POSITIONS; (D) ONE OF SAID HINGES INCLUDING BEARING ELEMENTS RESPECTIVELY CONNECTED TO SAID HINGE ELEMENTS THEREOF; (E) SAID BEARING ELEMENTS OF SAID ONE HINGE BEING AXIALLY ALIGNED, WHEN SAID HINGE ELEMENTS OF SAID ONE HINGE ARE IN THEIR CLOSED POSITIONS, TO PROVIDE A LOCKING AXIS WHICH IS PERPENDICULAR TO SAID HINGE AXIS AND ABOUT WHICH SAID ONE HINGE IS PIVOTABLE TO MISALIGN SAID HINGE PINS; (F) THEREBY PREVENTING RELATIVE PIVOTAL MOVEMENT OF THE HINGEDLY CONNECTIBLE MEMBER WHEN THEY ARE CONNECTED TO SAID HINGES; AND (G) LOCKING MEANS FOR PIVOTING SAID ONE HINGE ABOUT SAID LOCKING AXIS INTO A POSITION TO MISALIGN SAID HINGE PINS.

Images