US3158112A

US3158112A - Folding ironing board

Info

Publication number: US3158112A
Application number: US268035A
Authority: US
Inventors: Smith Eugene
Original assignee: CAHILL METALS CORP
Current assignee: CAHILL METALS CORP
Priority date: 1963-03-26
Filing date: 1963-03-26
Publication date: 1964-11-24
Anticipated expiration: 1981-11-24

Description

Nov. 24, 1964 E. SMITH 3,158,112

FOLDING IRONING BOARD Filed March 26, 1963 2 Sheets-Sheet 1 INVENTOR.

Eugene Sm [#2 BY RM W Affomey Nov. 24, 1964 E. SMITH 3,158,112

FOLDING IRONING BOARD Filed March 26, 1963 2 Sheets-Sheet 2 I y W y INVENTOR.

BY Eugene 5/77/7/2 Rah/d: 5,

A l/omey United States Patent 3,158,112 FDLDENG IRQNENG BQARD Eugene Smith, Long Beach, N.Y., assignor to Qahill Metals Corporation, New York, N.Y., a corporation of New York Filed Mar. 26, 1963, Ser. No. 268,035 8 Claims. (Q1. 1 3S-36) This invention relates to ironing boards, and in particular to ironing board structures that can be folded or collapsed when not in use.

An ordinary household ironing board comprises an elongate, horizontally disposed ironing table supported by legs at a suitable working height above the floor. In a conventional ironing board structure, the legs may be collapsible to some extent, but the board nevertheless remains a bulky and cumbersome object requiring substantial storage space. Such structure cannot conveniently be carried by travelers, as for use in ironing or pressing garments during the course of travel. The large size of the board is also an inconvenience in circumstances where available storage space is limited.

These difficulties can be obviated by provision of an ironing board structure in which the ironing table as well as the legs can be collapsed into a small, compact, readily portable unit. A board of this type should be easily foldable and in particular should be mechanically simple, both for convenience of the user and for economy of manufacture. At the same time, to constitute a useful ironing table, it should open to full ironing board size and must be rigid and structurally stable when thus open; that is to say, it must be able to Withstand the ordinary pressures and stresses incident to ironing without tending to collapse.

A primary object of the present invention is to provide a structurally simple, portable ironing board which folds easily into a compact unit of small size and opens to constitute a stable, rigid, full sized ironing table.

Another and particular object is to provide such ironing board structure having foldable legs which are substantially incapable of accidental collapse when in open position.

Further objects and advantages of the invention will be apparent from the detailed description hereinbelow set forth, together with the accompanying drawings, wherein:

FIG. 1 is a perspective view of an ironing board struc ture embodying the present invention in a particular form;

FIG. 2 is an elevational cross-sectional view taken along the plane 2?. of FIG. 1;

FIG. 3 is a fragmentary perspective view illustrating, in exploded relation, certain details of the leg structure of the board of FIG. 1;

FIG. 4 is a side view or" one leg of the board of FIG. 1, in folded position;

FIG. 5 is a sectional view taken along the plane 55 of FIG. 4;

FIG. 6 is a plan view of the underside of the center section of the board of FIG. 1, showing the arrangement of the legs in folded position;

FIG. 7 is a side elevational view of the board of FIG. 1 in folded position;

FIG. 8 is an elevational view of one hinge plate of the board of FIG. 1; and

FIG. 9 is a sectional view taken as along the plane 9-9 of FIG. 8.

Referring to the drawings, the invention in its illustrated embodiment is arranged to provide an ironing table or board of conventional dimensions and configuration, as shown in FIG. 1. This table comprises a center section it), a first wing section 11 tapered to constitute the nose of the ironing table, and a second wing-sec- 3,158,112 Patented Nov. 24, 1964 "ice tion 12, all conveniently fabricated of sheet metal or like light-weight, rigid material. The

wings

11, 12 are hingedly connected to the opposite extremities of the center section and (as indicated in FIG. 7) are arranged to fold in overlapping relation above the center section when the board is collapsed.

The center section 10 is shown as having parallel, downwardly extending side flanges 14, which contribute to the structural rigidity of this section. The end of the wing 11 abutting the center section also bears downwardly extending parallel side flange portions 16; in addition, as illustrated in FIG. 2, this end of the wing 11 is shaped to provide an offset extension 17 which projects beneath the center section to engage the underside of the latter when the wing is in open position. The wing 12 has a similarly arranged offset extension 19 and side flange portions 20 at its end adjacent the center section. Metal clips 22 may be mounted on the underside of the center section to engage these

offset extensions

17, 19. As will be understood, when the board is open the latter extensions, abutting the underside of the center section, aid in maintaining the respective wings in rigid, coplanar relation to the center section.

The wing 12 is shown as connected to the center section by hinge plates 25 respectively extending between the adjacent side flanges of the wing and center section on opposite sides of the board. Each of these hinge plates 25, as shown in FIGS. 8 and 9, has a central slot 26 providing a short upper track 26a and an elongated lower track 2612, and is movably mounted on a pair of rivets 27 which are respectively aifixed to the adjacent side flanges 14, it? of the center section 10 and wing 12. The rivets 27 extend through the slot 26 and have enlarged heads adapted to engage the outer surface of the hinge plate so as to hold the plate against the flanges 14, 211?. As hereinafter explained, this hinge plate arrangement permits upward rotation of the wing 12 from the open position of FIG. 1 to the folded position of FIG. 7, in which this wing lies immediately above and parallel to the center section. The wing 11 is connected to the center section by similar hinge plates 28, mounted on rivets 29 in the same manner as the hinge plates 25, and arranged and dimensioned to enable the wing 11 to rotate upwardly to a folded position directly above and parallel to the wing 12, as shown in FIG. 7.

To support the board in open position, a pair of

legs

30, 31 is mounted on the underside of the center section 111 adjacent the wing 11, and a second pair of

legs

33, 34 is mounted on the underside of the center section adjacent the wing 12. Each pair of legs when open extends downwardly from the center section 10, and also outwardly from the center section in the direction of the adjacent wing, to provide a broad base of support for the board. The overall dimension of the legs is such as to support the ironing table in horizontal position at a convenient working height.

These four legs are essentially identical in construction, and hence their structure may be sufliciently described by detailed consideration of the leg 3%, shown in FIGS. 2 5. The latter leg comprises an upper channel member 36 and a lower channel member 37. At its upper extremity, the member 35 is pivotally mounted in a downwardlyopening U-shaped bracket 39, which i fixed to the underside of the center section 10 and oriented to permit rotation of this member in a vertical plane parallel to the long axis of the ironing board. In folded position the member 36 lies beneath and parallel to the underside of the center section 10, with the channel of the member opening toward the center section. The upper extremity of the member 36 is shaped to permit rotation of the member through an angle of more than from the latter folded position to an open position in which it extends downwardly and outwardly from the center section, viz. in the direction of the wing 11.

The lower channel member 37 i narrower than the upper member 36, so that it may be folded into the channel of the upper member. As shown in FIGS. 23, this lower member terminates at its upper extremity in upwardly extending side flanges 41, 42, which are pivotally mounted (as by a pin 43) in the upper member 36 adjacent the lower end thereof to permit rotation of the member 37 into and out of the channel of the member 36. It will be appreciated that this rotation occurs in the same plane as the aforementioned rotation of the member 36. Thus in folded position, the member 37 lies substantially entirely within the upper member 36, as shown in FIGS. 4-5, with the lower extremity of the member 37 directed toward the upper end of the member 36. In opening the leg, the member 37 is rotated downwardly and forwardly from the last-mentioned position until the upper front edge 4-4 of this member 37 abuts the lower front edge 15 of the member 36, preventing further rotation.

In open position, therefore, the lower member 37 extends downwardly and outwardly from the member 36, and the latter member bears upon the upper front edge 44 of this lower member, as shown in FIG. 2. As a particular feature of the invention, this upper front edge 44 is offset, with respect to the position of the pivot pin 43, in such manner that the member 37 rotates through more than 90 from its folded position before the edge 44 abuts the lower edge 45 of the member 36. Consequently, in open position the lower member 37 is bent slightly outward in relation to the upper member 36, instead of being aligned with the latter member.

Because of this offset leg arrangement, which is identical for all four of the

legs

30, 31, 33, 3d, the legs in extended position are positively restrained from accidental collapse. Thus, for example (referring again to the leg 36), an outwardly-directed longitudinal thrust along the ironing table in the direction of the wing 11 does not tend to cause rotation of the lower member 37 toward closed position, as it might if the member 37 in open position were aligned with the member 36, and hence the leg joint between the two members cannot exhibit any tendency to buckle outwardly. For this reason, the two-piece legs of the present structure, while readily foldable into the compact closed position shown in FIG. 4, are comparable in stability and rigidity to a single-piece leg when open.

The leg 36 described above and the corresponding leg 31 (also pivotally mounted in a U-shaped bracket designated 48 in FIG. 6, at the end of the center section 16 adjacent the wing 11) are arranged to form a-pair of legs with respectively parallel upper and lower members. To prevent lateral spreading of the

legs

36, 31 when open, a cross piece may be connected between the front .surfaces of the respective lower members of these legs. A yoke brace 52, conveniently in the form of a U-shaped metal bar, is pivotally mounted at its extremities on the respective legs .36, 31, and extends diagonally upward and outward therefrom in open position to engage the underside of the wing 11, e.g. being held by a springmetal clip 53 mounted on the underside of this wing, As indicated in FIG. 2, the yoke brace may be connected to the inner side of the leg 30 by the pivot pin 43 adjacent the joint of the upper and lower .iembers, and to the inner side of the leg 31 by the corresponding pivot pin in the latter leg. This yoke brace serves to support the wing 11 when the board is open so as to maintain the latter in rigid coplanar relation to the center section 10.

The pair of

legs

33, 34 at the opposite end of the center section lltl are arranged in the same manner as the

legs

30, 31, being pivotally mounted on the underside of the center section in U-shaped brackets respectively designated 55, 56 in FIG. 6, for rotation to an open position extending downwardly and outwardly toward the wing 12. A cross piece 57 (analogous to the cross piece 56) extends i open position.

between the front surfaces of the lower members of these

legs

33, 34. In addition, a U-shaped yoke brace 59 (corresponding to the yoke brace 52) is pivotally mounted at its extremities on the

respective legs

33, 34, and in open position extends diagonally upward therefrom to engage the underside of the wing 12, for support of the latter wing, e.g. being held by a spring-metal clip 66 provided on the underside of such wing.

As a further stabilizing feature, the board structure may also very advantageously include a foldable spreader brace 62, which in open position extends between the respective pairs of legs 3%, 3i and 33, 34 to aid in maintaining these pairs of legs in rigid, downwardly diverging relation. The brace 62 in the form shown-comprises a first channel member 63 pivotally mounted in a bracket on the cross-piece 5i) intermediate the lower members of the pair of

legs

36, 31; a second channel member 65, dimensioned and arranged to fold within the channel of the member 63, being pivotally mounted in the outer extremity of the member 63 as by a pin 66; and a third channel member 67, dimensioned and arranged to fold within the channel of the member 65, being pivotally mounted in the outer extremity of the member 65 as by a pin 68. The member 67 bears at its outer extremity a hook 65 which is adapted to engage a bracket 70 mounted on the cross-piece 57 intermediate the lower members of the pair of

legs

33, 34.

When the brace 62 is open, as shown in FIGS. 1 and 2, the front edge 71 of the member 65 (the edge adjacent the pivot pin 66) abuts the outer front edge 72 of the member 63, and the front edge 73 of the member 67 (adjacent the pin 68) abuts the outer front edge '74 of the member 65. The edge 71 is off-set with respect to the position of the pin 66, and the edge 73 is similarly off-set with respect to the pin 68, so that the

members

65, 67 each rotate through an angle of more than Ge. about the respective pivot pins 66, 68) from folded position to Specifically, as a result of this off-set arrangement, the member 65 lies flat along the floor when the brace 62 is open, providing an additional point of support for the ironing board, while the

members

63, 67 extend diagonally upward from the opposite ends of the member 65 to the

respective leg cross-pieces

50, 57. In addition, the off-set arrangement of the brace members prevents the brace from accidentally buckling or collapsing when open. 7

Thus in open position (with the hook 69 engaging the bracket 70) the brace 62 constitutes an effectively rigid structure, extending between the pair of

legs

30, 31 and the pair of

legs

33, 34 and thereby opposing any tendency of these pairs of legs to fold inwardly toward each other. At the same time, the brace is readily collapsible into a compact unit, the member 67 folding into the channel of the member 65, the member 65 in turn folding into the channel of the member 63, and the latter member being pivotally movable to a position in which it lies between and parallel to the lower members of the

leg pair

30, 31.

As shown more particularly in FIG. 6, the

legs

33, 34 providing the pair adjacent the wing 12 are spaced in equidistant relation to the long axis of the board. The

pair of

legs

39, 31 are also spaced in equidistant relation to the latter axis, but the distance between the respective outer sides of the

legs

36, 31 is smaller than the distance between the respective inner sides of the

legs

33, 34.

Thus when the legs are in closed position, the folded

legs

30, 31 nestle between the folded

legs

33, 34 beneath the underside of the center section 10.

The manner in which the board is folded from the open position shown in FIG. 1 to the closed position shown in FIGS. 6 and 7 will now be readily apparent. The

wings

12, 11 areiirst successively folded over the center section 10 to lie in overlapping relation above the latter section. The manner in which this is effected may be explained with reference to the movement of the wing 12. As indicated in FIGS. 1, 8 and 9, when the wing is in open position each of the hinge plates 25 seats by gravity on the rivets 27 with the rivets positioned at the outer extremities of the short upper track 26a, effectively locking the wing against the center section. To fold the wing, each of the hinge plates 25 is lifted, so that the rivets seat in the elongated lower track 2612; the wing is then pulled horizontally outward from the center section, disengaging the wing extension 19 from the clips 22, and moving the rivets 27 to the outer extremities of the elongated track 26b. Such outward movement, increasing the distance between the rivets, provides clearance for the wing to enable it to be rotated upwardly until it rests above the center section in the folded position shown in FIG. 7. Folding of the wing 11 is then accomplished by a similar operation.

With the wings thus folded, the spreader brace 62 is disengaged from the bracket 70 and collapsed to lie between the lower members of the

legs

30, 31. The lower members of the

legs

33, 34 are then folded into the respective upper members of the latter legs, so that they lie substantially entirely within these upper members, with the cross piece 57 extending between them and behind the rearward edges of the latter upper members. The upper members of the

legs

33, 34 are in turn rotated inwardly and upwardly to lie closely beneath and parallel to the underside of the center section 19, with the cross piece 57 immediately adjacent the underside of this center section. Thereafter the yoke brace 59 is rotated to a position in which it lies between and parallel to the folded

legs

33, 34.

The lower members of the

legs

30, 31 are subsequently rotated inwardly and upwardly into the upper members of these latter legs, and such upper members are rotated to a position, beneath the underside of the center section 10, between the arms of the yoke brace 59 and parallel to the

legs

33, 34, the cross piece 50 then lying immediately adjacent the underside of the center section and the spreader brace 62 lying between the

legs

30, 31 and parallel thereto. Finally the yoke brace 52 is rotated to a position between and parallel to the

legs

30, 31.

In such folded position (shown in FIG. 6) the legs, spreader brace, and yoke braces nestle compactly, in mutually coplanar relation, beneath the center section (which extends beyond them in all direction) in the recess defined by the side flanges 14. One or both of the yoke braces 52, 59 may if desired be engaged by spring-

metal clips

77, 78 mounted on the underside of the center section, to positively secure them from unfolding. The folded board, as shown in FIG. 7, is compact, desirably small in size and readily portable. For convenience in carrying, it may be provided with a handle 80 mounted on one of the side flanges 14 of the center section 10.

To open the board, the procedures described above are reversed; that is to say, the yoke brace 52, and the upper members and lower members of the

leg pair

30, 31 are sequentially rotated to open position, followed in order by the yoke brace 59 and the upper and lower members of the

leg pair

33, 34, until all four legs are extended in the manner shown in FIG. 1. The spreader brace 62 is unfolded and hooked to the bracket 70 on the cross-piece 57. Then, by applying foot pressure to the brace member 65, the brace 62 may be fully opened (i.e. so that the member 65 lies flat along the floor); as it is thus opened, the brace simultaneously exerts a transverse outward pressure on the pairs of

legs

30, 31 and 33, 34, spreading the legs to effect full outward extension of the legs. The

wings

11, 12 are then successively moved to open position. Finally the yoke braces 52, 59 are adjusted in position to engage the spring clips 53, 60 on the undersides of these respective wings. As thus opened, the center section 10 and

wings

11, 12 provide a rigid ironing-table, the wings being supported in coplanar relation to the center section by the yoke braces 52, 53; while the leg pairs 30, 31 and 33, 34 afford stable support for the table, being effectively incapable of accidental collapse, and

fully sturdy enough to withstand the stresses and pressures incident to ironing.

It is to be understood that the invention is not limited to the features and embodiments herein specifically set forth, but may be carried out in other ways without departure from its spirit.

I claim:

1. In a folding ironing board, in combination, first and second table sections, hinge means connecting said first and second table sections in endwise relation, an upper leg member having a lower end portion and a longitudinal channel, and a lower leg member dimensioned to fit within said channel, said upper leg member further having an upper end portion pivotally mounted on the underside of said first table section for rotation through an angle greater than between a position in which said upper member underlies said first section parallel thereto with said channel opening toward said first section and a position in which said upper member extends diagonally downwardly therefrom in the direction of said second section, and said lower member having an upper end portion pivotally mounted in the lower end portion of said upper member for rotation through an angle greater than 90 between a position in which said lower member lies within the channel of said upper member and a position in which said lower member extends diagonally downward from said upper member in the direction of said second section.

2. In a folding ironing board, in combination, first and second table sections, hinge means connecting said first and second table sections in endwise relation, an. upper leg member having a longitudinal channel and a lower end portion including a lower front edge surface, and a lower leg member dimensioned to fit within the channel of said upper member, said upper member further having an upper end portion pivotally mounted on the underside of said first table section for rotation through an angle greater than 90 between a position in which said upper member underlies said first section parallel thereto with said channel opening toward said first section and a position in which said upper member extends diagonally downward therefrom in the direction of said second section, said lower member having an upper extremity including a pivotal mounting connecting said lower member in said lower end portion of said upper member for downward rotation from a folded position in which said lower member lies within the channel of said upper member, and said lower member further having an upper front edge portion positioned in offset relation to said last-mentioned pivotal mounting for engagement with said lower front edge portion of said upper member when said lower member is in a downward position angularly displaced from said folded position by more than 90.

3. In a folding ironing board, in combination, first and second table sections, hinge means providing endwise connection of said first and second table sections and arranged to permit angular displacement of said second section from a position coplanar with said first section to a position overlapping said first section, a pair of folding legs extensible downwardly and outwardly from said first section in the direction of said second section, and a brace member pivotally mounted to said pair of legs and extensible diagonally upward therefrom to engage the underside of said second section for support thereof when said pair of legs is in extended position, each of said legs comprising an upper leg member having a longitudinal channel and a lower end portion including a lower front edge surface, and a lower leg member dimensioned to fit within the channel of said upper member, said upper member further having an upper end portion pivotally mounted on the underside of said first table section for rotation through an angle greater than 90 between a position in which said upper member underlies said first section parallel thereto with said channel opening toward said first section and a position in which said upper member extends diagonally downward therefrom in the direction of said second section, said lower member havin an upper extremity including a pivotal mounting connecting said lower member in said lower end portion of said upper member for downward rotation from a folded position in which said lower member lies within the channel of said upper member, and said lower member further having an upper front edge portion positioned in offset relation to said last-mentioned pivotal mounting for engagement with said lower front edge portion of said upper member when said lower member is in a downward position angularly displaced from said folded position by more than 90.

4. A folding ironing board, comprising, in combination, a e ter able se on, fi s a d se d ins t le sections, first and second hinge means respectively providing endwise connection of said first and second wing sections to said center section at opposite ends of said center section and respectively arranged to permit folding of said first and second wing sections in overlapping relation above said center section, first and second pairs of folding legs respectively extensible downwardly and outwardly from said center section in the direction of said first and second wing sections, and first and second brace members respectively pivotally mounted to said first and second pairs of legs and extensible diagonally upward therefrom to engage the underside of said first and second wing sections respectively for support thereof when said first and second pairs of legs are in extended position, said first and second wing sections having lower surface portions engageable with said first and second brace members respectively, each of said legs comprising an upper leg member having a longitudinal channel and a lower end portion including a lower front edge surface, s

and a lower leg member dimensioned to fit within the channel of said upper member, said upper member further having an upper end portion pivotally mounted on the underside of said ,center section for rotation through an angle greater than 90 between a position in which said upper member underlies said center section parallel thereto with said channel opening toward said center section and a position in which said upper member extends diagonally downward therefrom, said lower member having an upper extremity including a pivotal mounting connecting said lower member in said lower end portion of said upper member for downward rotation from a folded position in which said lower member lies within the channel of said upper member, said lower member further having an upper front edge portion positioned in offset relation to said last-mentioned pivotal mounting for engagement with said lower front edge portion of said upper member when said lower member is in ,a downward position angu-larly displaced from said folded position by more than 90, and the upper members of said first and second pairs of folding legs being mutually disposed on the underside of said center section in such manner that when said upper members are in position underlying said center section the upper members of said second pair of legs lie intermediate and parallel to the upper members of said first pair of legs.

5. Structure as defined in claim 4, including spreader brace means pivotallyconnected to the lower members of one of said pairs of folding legs, said spreader brace means being foldable to a position substantially coplanar and coextensive with said last-mentioned lower members and being extensible in open position to engage the lower members of the other of said pairs of folding legs to provide eifectively rigid connection between said first and second pairs of folding legs securing said pairs of legs against inward displacement relative to each other,

6, Structure as defined in claim 5, wherein said spreader brace means comprises a plurality of rigid members, arranged in end-to-end pivotal connection to each other for folding to a length substantially equal to the length of one of said rigid members and openings to an extended position connecting said first and second pairs of folding legs, and wherein, in said extended position, a lower edge portion of one of said rigid members lies in coplanar relation with the downward extremities of said pairs of folding legs.

7. Structure as defined in claim 4, including first and second cross-members respectively extending between the lower members of said first and second pairs of folding legs, and spreader brace means extensible .to provide eifectively rigid connection between said first and second crossmembers securing said first and second pairs of legs against inward displacement relative to each other, said spreader brace means comprising a first brace member pivotally mounted on said second cross-member and having a longitudinal channel, a second brace member pivotally mounted in the channel of said first brace member and dimensional to fit therein and having a longitudinal channel, and a third bnace member pivotally mounted in the channel .of said second brace member and dimensioned to fit therein and hearing at its outer extremity means engageable with said first cross-member, said first crossmember having a portionadapted for positive engagement with said engageable means, said brace members being foldable to a position substantially coplanar and coextensive with the lower members of said second pair of folding legs, and said brace members being further positioned and arranged such that in open position said brace members are axially off-set relative to each other, with the channels of said brace members opening downwardly and a lower edge portion of said second brace member lying in coplanar relation with the downward extremities of said pairs of folding legs.

8. Structure as defined in claim 4, wherein said first and second wing table sections have integral offset extensions respectively disposed at the ends of said wing sections adjacent said center section for engagement with the underside of said center section when said first and second wing sections are in open position.

llileferences Cited in the file of this patent UNITED STATES PATENTS 1,115,731 Owens Nov. 3, 1914 2,609,628 Toth Sept. 9, 1952 2,651,861 Wood Sept. 15, 1953 FOREIGN PATENTS 803,556 Germany Apr. 5, 1951 825,102 Great Britain Dec. 9, 1959 837,742 Great Britain June 15, 1960 1,204,992 France Ian.'2 9, 1960

Claims

1. IN A FOLDING IRONING BOARD, IN COMBINATION, FIRST AND SECOND TABLE SECTIONS, HINGE MEANS CONNECTING SAID FIRST AND SECOND TABLE SECTIONS IN ENDWISE RELATION, AN UPPER LEG MEMBER HAVING A LOWER END PORTION AND A LONGITUDINAL CHANNEL, AND A LOWER LEG MEMBER DIMENSIONED TO FIT WITHIN SAID CHANNEL, SAID UPPER LEG MEMBER FURTHER HAVING AN UPPER END PORTION PIVOTALLY MOUNTED ON THE UNDERSIDE OF SAID FIRST TABLE SECTION FOR ROTATION THROUGH AN ANGLE GREATER THAN 90* BETWEEN A POSITION IN WHICH SAID UPPER MEMBER UNDERLIES SAID FIRST SECTION PARALLEL THERETO WITH SAID CHANNEL OPENING TOWARD SAID FIRST SECTION AND A POSITION IN WHICH SAID UPPER MEMBER EXTENDS DIAGONALLY DOWNWARDLY THEREFROM IN THE DIRECTION OF SAID SECOND SECTION, AND SAID LOWER MEMBER HAVING AN UPPER END PORTION PIVOTALLY MOUNTED IN THE LOWER END PORTION OF SAID UPPER MEMBER FOR ROTATION THROUGH AN ANGLE GREATER THAN 90* BETWEEN A POSITION IN WHICH SAID LOWER MEMBER LIES WITHIN THE CHANNEL OF SAID UPPER MEMBER AND A POSITION IN WHICH SAID LOWER MEMBER EXTENDS DIAGONALLY DOWNWARD FROM SAID UPPER MEMBER IN THE DIRECTION OF SAID SECOND SECTION.