US3848699A - Interlocking bucking hinge and ladder combination - Google Patents
Interlocking bucking hinge and ladder combination Download PDFInfo
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- US3848699A US3848699A US00357926A US35792673A US3848699A US 3848699 A US3848699 A US 3848699A US 00357926 A US00357926 A US 00357926A US 35792673 A US35792673 A US 35792673A US 3848699 A US3848699 A US 3848699A
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C1/00—Ladders in general
- E06C1/52—Ladders in general with non-rigid longitudinal members
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- ABSTRACT A foldable ladder made up of at least four sections. Each section has a first side rail and a second side rail. The side rails of two of the sections are connected to the respective side rails of another section by an improved hinge.
- the hinge is made up of p1ate1ike bellcrank-shaped links stacked in parallel planes with spacers between the links.
- the spacers are the same thickness as the links.
- One leg of the links has its distal end interleaved between and pivoted to two distal ends of the links attached to the other section.
- each link When the ladder is unfolded, each link has an end that engages one of the ends of the spacer so that the sections of the ladder are held in rigid extended relation to each other.
- two sections of the ladder define a space between them which receives two sections of the ladder.
- the hinge and ladder combination disclosed herein constitutes an improvement over the ladders shown in U.S. Pat. No. 3,081,840, U.S. Pat. No. 3,287,895, U.S. Pat. No. 3,239,862, U.S. Pat. No. 3,181,676 and U.S. Pat. No. 3,172,680.
- the ladders disclosed in the said patents are only able to fold one on top of the other. With the hinge disclosed herein, the ladder sections will fold with one end section between the other two sections.
- Another object of the invention is to provide an improved combination ladder and hinge.
- Another object of the invention is to provide an improved hinge.
- FIG. 1 is a front view of the ladder according to the invention.
- FIG. 2 is an enlarged cross sectional view taken on line 22 of FIG. 1 with the ladder folded.
- FIG. 3 is a cross sectional view taken on line 33 of FIG. 1.
- FIG. 4 is an enlarged partial front view of the hinge that joins the topmost section to the intermediate section.
- FIG. 5 is a diagram showing the ladder sections when folded.
- FIG. 6 is an edge view of one of the links.
- FIG. 7 is a side view of one of the links.
- FIG. 8 is a side view of a spacer.
- FIG. 9 is an end view of a spacer.
- the ladder 10 is of the general type of foldable ladder shown in U.S. Pat. No. 3,081,840.
- the ladder disclosed has four sections, a first intermediate section 11, a second intermediate section 12, and a first outer section 13 and a second outer section 13', all hingedly connected together by hinges 18, 43 and 43.
- the first intermediate section 11 has first side rail 14 and second side rail 15. Side rails 14 and are connected to the first side rail 22 and the second side rail 23 of second intermediate section 12 by means of hinges 42, and the first intermediate section 11 and first end sections 13' are hingedly connected together by hinges 43.
- the first end section 13 has a first side rail 24 and a second side rail and the second outer section 13 has first side rail 24 and second side rail 25.
- Each side rail has a first end and a second end.
- the side rails of the first section 11 have first ends 16 and 17, and second ends 18 and 19 respectively.
- the side rails of the second section have first ends 20 and 21 and second ends.
- the side rails of the third section 13 have first ends 24 and 25 and second ends 26 and 27 respectively.
- the side rails of the several sections are connected together laterally by steps 28.
- the side rails of the ladder are preferably made of material channel-shaped in cross section. Each channel sectionhas a web 30 and flanges 31 and 32.
- the hinges 42 are made up of first L-shaped links 33 and second .L-shaped links 34.
- the links 33 and 34 each have a longitudinal portion or leg 35 and lateral portion or leg 37, and a second portion or leg 38. Legs 37 and 38 each fortn a projection and gudgeon.
- the links 33 and 34 each have a second lateral leg 37 which extends laterally beyond the first legs 35 and 36 respectively.
- the first links 33 are held in spaced relation to each other by spacers 46 between them.
- the spacers 46 are rectangular and are shorter than the links 33 and 34 and an open space is provided between each two adjacent links.
- the ends of the first links 33 are interleaved between and receive corresponding ends of the second links between them.
- the links may be fixed to the flanges of the channels by means of bolts 50.
- the legs 37 of links 33 are pivoted to the second leg 38 of links 34 by a pivot 39 which may be a bolt that extends through all of the second links of the particular hinge.
- ends 44 and 45 of the links 33 and 34 respectively are flat and the ends 47 of spacers 46 terminate in spaced relation to the ends 44 45 of the links 33 and 34.
- the ends '44 and 45 of the links extend beyond the ends 47 of the spacers.
- a space is provided between the sections 11 and 1-2 and section 13 is received in this space when the ladder is in folded position, as shown in FIG. 5.
- the second ends 18 and 19 of the side rails 14 and 15 are swingably connected to the first ends 20 and 21 of the side rails 22 and 23 by hinges 42, shown in the enlarged view in FIG. 2.
- Hinges ,43 and 43 may be of the type shown connecting the several sections of legs of the ladder in U.S. Pat. No. 3,081 ,840or they could be any other suitable type of hinge.
- a hinge comprising a first stack of platelike members and a second stack of platelike members
- said first stack of platelike members comprising first links having first spacers disposed therebetween
- said first links having laterally extending portions extending laterally beyond the sides of said first spacers
- said second links having laterally extending portions extending laterally beyond said sides of said second spacers and disposed between said laterally extending side portions of said first links
- pivot means connecting said side portions of said first links to the laterally extending side portions of said second links
- ends of said first portion of said second links being adapted to engage the ends of said first spacers when said second links are swung into alignment with said first links
- said first links and said second links defining a space between when said second links are swung into spaced parallel relation to said first links.
- a third channel can be disposed between said first channel and said second channel when said channels are swung into spaced parallel relation with each other.
- said first leg of said first link being disposed between the flanges of said first channel
- a hinge and ladder combination comprising,
- a foldable extension ladder having a plurality of substantially rigid relatively adjoining ladder forming sections
- each of said sections including a pair of relatively spaced apart longitudinally extending side rails and at least one step-forming member extending transversely between said side rails and fixed thereto,
- said sections comprising a first section, a second secsaid second end of said second section being swingably connected to the first end of said third section by second hinges,
- said first hinges each comprising a plurality of first links held in spaced relation to each other by means of first spacers
- each said link being platelike in construction and being of substantially the same thickness as said spacers,
- each said link having a first leg and a second leg integrally joined together
- said first leg of said second links being fixed to said first end of saidsecond section side rails
- third section is adapted to swing between said first section and said second section when said ladder sections lie in parallel planes.
- a hinge comprising a group of first members and a group of second members
- said first members being spaced from said second members
- said first members and said second members being adapted to be connected to two spaced members to swingably connect said spaced members
- said groups of first members and second members comprise a first stack of platelike members and a second stack of platelike members respectively, said second stack of platelike members laterally spaced from said first stack,
- each alternate plate in each said stack having a projection extending toward the other said stack
- each said projection in said first stack being disposed between two adjacent plates in said second stack
- said first section and said second section each having an end section swingably connected thereto
- said end sections adapted to swing between the space between said first section and said second section when said ladder is folded
- a ladder comprising a first intermediate section and a second intermediate section
- first hinge means swingably connecting said first intermediate section to said second intermediate section
- said end sections being adapted to swing into parallel relation with said first intermediate section and said second intermediate section, said intermediate sections being adapted to swing into spaced parallel relation with each other providing a space to receive said first end section and said second end section whereby said sections are disposed in parallel planes. said sections being further adapted to swing into alignment with each other,
- stop means limiting the swinging of said sections relative to each other when said sections are in alignment
- said third hinge member comprising said stop means for limiting the swinging movement of said sections relative to each other to hold said sections in alignment during use
- said hinge means comprise a plurality of L-shaped links fixed to each said intermediate section
- pivot means connecting said L-shaped links together whereby said end sections are disposed between said intermediate sections when said ladder is folded.
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Abstract
A foldable ladder made up of at least four sections. Each section has a first side rail and a second side rail. The side rails of two of the sections are connected to the respective side rails of another section by an improved hinge. The hinge is made up of platelike bellcrank-shaped links stacked in parallel planes with spacers between the links. The spacers are the same thickness as the links. One leg of the links has its distal end interleaved between and pivoted to two distal ends of the links attached to the other section. When the ladder is unfolded, each link has an end that engages one of the ends of the spacer so that the sections of the ladder are held in rigid extended relation to each other. When the ladder is folded, two sections of the ladder define a space between them which receives two sections of the ladder. By using additional improved hinges, the ladder could be made with several sections.
Description
Unite States Patent Goodwin INTERLOCKING BUCKING HINGE AND LADDER COMBINATION [75] Inventor: Charles W. Goodwin, Erie, Pa.
[73] Assignee: PMCS Company, Inc., Erie, Pa.
[22] Filed: May 7, 1973 21 Appl. No; 357,926
[52] US. Cl. 182/163, 182/24 [51] Int. Cl. E06c U383 [58] Field of Search 182/24, 27, 23, 163, 164, 182/152; 16/157, 135
[5 6] References Cited UNITED STATES PATENTS 513,012 l/l894 Hall 182/27 612,201 10/1898 Hart 16/157 1,587,383 6/l926 Kenneth 182/24 2,782,075 2/1957 Fagan 182/152 3,231,045 l/l966 Lavrard 182/164 Primary Examiner-Reinaldo P. Machado [5 7 ABSTRACT A foldable ladder made up of at least four sections. Each section has a first side rail and a second side rail. The side rails of two of the sections are connected to the respective side rails of another section by an improved hinge. The hinge is made up of p1ate1ike bellcrank-shaped links stacked in parallel planes with spacers between the links. The spacers are the same thickness as the links. One leg of the links has its distal end interleaved between and pivoted to two distal ends of the links attached to the other section. When the ladder is unfolded, each link has an end that engages one of the ends of the spacer so that the sections of the ladder are held in rigid extended relation to each other. When the ladder is folded, two sections of the ladder define a space between them which receives two sections of the ladder. By using additional improved hinges, the ladder could be made with several sections.
11 Claims, 9 Drawing Figures 43 1 14-$ O 3 1 L ir 3 9/1 13 HIE/4 L 21 20 H H 2 ,/'12
27 2e LT,-
INTERLOCKING BUCKING HINGE AND LADDER COMBINATION REFERENCE TO PRIOR ART The hinge and ladder combination disclosed herein constitutes an improvement over the ladders shown in U.S. Pat. No. 3,081,840, U.S. Pat. No. 3,287,895, U.S. Pat. No. 3,239,862, U.S. Pat. No. 3,181,676 and U.S. Pat. No. 3,172,680. The ladders disclosed in the said patents are only able to fold one on top of the other. With the hinge disclosed herein, the ladder sections will fold with one end section between the other two sections.
OBJECTS OF THE INVENTION It is an object of the invention to provide an improved ladder.
Another object of the invention is to provide an improved combination ladder and hinge.
Another object of the invention is to provide an improved hinge.
With the above and other objects in view, the present invention consists of the combination and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawing and more particularly pointed out in the appended claims, it being understood that changes may be made in the form, size, proportions, and minor details of construction without departing from the spirit or sacrificing any of the advantages of the invention.
GENERAL DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of the ladder according to the invention.
FIG. 2 is an enlarged cross sectional view taken on line 22 of FIG. 1 with the ladder folded.
FIG. 3 is a cross sectional view taken on line 33 of FIG. 1.
FIG. 4 is an enlarged partial front view of the hinge that joins the topmost section to the intermediate section.
FIG. 5 is a diagram showing the ladder sections when folded.
FIG. 6 is an edge view of one of the links.
FIG. 7 is a side view of one of the links.
FIG. 8 is a side view of a spacer.
FIG. 9 is an end view of a spacer.
DETAILED DESCRIPTION OF THE DRAWINGS Now with more particular reference to the drawings, the ladder 10 is of the general type of foldable ladder shown in U.S. Pat. No. 3,081,840. For example, the ladder disclosed has four sections, a first intermediate section 11, a second intermediate section 12, and a first outer section 13 and a second outer section 13', all hingedly connected together by hinges 18, 43 and 43.
The first intermediate section 11 has first side rail 14 and second side rail 15. Side rails 14 and are connected to the first side rail 22 and the second side rail 23 of second intermediate section 12 by means of hinges 42, and the first intermediate section 11 and first end sections 13' are hingedly connected together by hinges 43. The first end section 13 has a first side rail 24 and a second side rail and the second outer section 13 has first side rail 24 and second side rail 25.
Each side rail has a first end and a second end. The side rails of the first section 11 have first ends 16 and 17, and second ends 18 and 19 respectively. The side rails of the second section have first ends 20 and 21 and second ends. The side rails of the third section 13 have first ends 24 and 25 and second ends 26 and 27 respectively. The side rails of the several sections are connected together laterally by steps 28.
The side rails of the ladder are preferably made of material channel-shaped in cross section. Each channel sectionhas a web 30 and flanges 31 and 32. The hinges 42 are made up of first L-shaped links 33 and second .L-shaped links 34. The links 33 and 34 each have a longitudinal portion or leg 35 and lateral portion or leg 37, and a second portion or leg 38. Legs 37 and 38 each fortn a projection and gudgeon. The links 33 and 34 each have a second lateral leg 37 which extends laterally beyond the first legs 35 and 36 respectively. The first links 33 are held in spaced relation to each other by spacers 46 between them. The spacers 46 are rectangular and are shorter than the links 33 and 34 and an open space is provided between each two adjacent links. The ends of the first links 33 are interleaved between and receive corresponding ends of the second links between them. The links may be fixed to the flanges of the channels by means of bolts 50. The legs 37 of links 33 are pivoted to the second leg 38 of links 34 by a pivot 39 which may be a bolt that extends through all of the second links of the particular hinge.
It will be noted that the ends 44 and 45 of the links 33 and 34 respectively are flat and the ends 47 of spacers 46 terminate in spaced relation to the ends 44 45 of the links 33 and 34. Thus when the ladder is in extended position for use, the ends '44 and 45 of the links extend beyond the ends 47 of the spacers. A space is provided between the sections 11 and 1-2 and section 13 is received in this space when the ladder is in folded position, as shown in FIG. 5.
It will be noted that the second ends 18 and 19 of the side rails 14 and 15 are swingably connected to the first ends 20 and 21 of the side rails 22 and 23 by hinges 42, shown in the enlarged view in FIG. 2.
It will likewise be noted that the second ends of the side rails 22 and 23 of the section section 12 are swingably connected to the first ends 24 and 25 of the side rails of second section 13 by means of hinges 43 and fourth section 13 has its side rails connected to the side rails of section 11 by hinges 43'. Hinges ,43 and 43 may be of the type shown connecting the several sections of legs of the ladder in U.S. Pat. No. 3,081 ,840or they could be any other suitable type of hinge.
The foregoing specification sets forth the invention in its preferred practical forms but the structure shown is capable of modification within a range of equivalents without departing from the invention which is to be understood is broadly novel as is commensurate with the appended claims.
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: I
l. A hinge comprising a first stack of platelike members and a second stack of platelike members,
said first stack of platelike members comprising first links having first spacers disposed therebetween,
and said second stack of platelike members comprising second links having second spacers disposed therebetween,
a first end of said first links extending beyond a first end of said first spacers,
and a first end of said second links extending beyond the first end of said second spacers,
said first links having laterally extending portions extending laterally beyond the sides of said first spacers,
said second links having laterally extending portions extending laterally beyond said sides of said second spacers and disposed between said laterally extending side portions of said first links,
pivot means connecting said side portions of said first links to the laterally extending side portions of said second links,
the ends of said first portion of said second links being adapted to engage the ends of said first spacers when said second links are swung into alignment with said first links,
said first links and said second links defining a space between when said second links are swung into spaced parallel relation to said first links.
2. The hinge recited in claim 1 wherein a first channel member has spaced flanges and a web is provided,
equal to the width of a said flange on said channel whereby a third channel can be disposed between said first channel and said second channel when said channels are swung into spaced parallel relation with each other.
3. The hinge recited in claim 1 wherein said links are L-shaped and have a first leg comprising said first portion and a second leg comprising said second portion,
said first leg of said first link being disposed between the flanges of said first channel,
and said first leg of said second link being disposed between the flanges of said second channel,
and said second leg of said first link extending beyond the said first leg in l .-shaped relation,
the said second legs of said first links being disposed between the said second flanges of said second channel,
and said pivot means extending through said second legs of said first links and said second links.
4. The hinge recited in claim 3 wherein the first ends of said spacers terminate a distance from'the ends of said links equal to twice the distance from said pivot to the edge of said links whereby the said second link engages said first spacers to hold said links in alignment with each other.
5. A hinge and ladder combination comprising,
a foldable extension ladder having a plurality of substantially rigid relatively adjoining ladder forming sections,
each of said sections including a pair of relatively spaced apart longitudinally extending side rails and at least one step-forming member extending transversely between said side rails and fixed thereto,
said sections comprising a first section, a second secsaid second end of said second section being swingably connected to the first end of said third section by second hinges,
said first hinges each comprising a plurality of first links held in spaced relation to each other by means of first spacers,
and second links held together by means of second spacers,
each said link being platelike in construction and being of substantially the same thickness as said spacers,
each said link having a first leg and a second leg integrally joined together,
the first leg of said first links being fixed to the second end of said first section of said ladder,
said first leg of said second links being fixed to said first end of saidsecond section side rails,
the distal ends of said second legs of said first links being pivotally connected to the distal ends of second legs of said second links,
' and pivot means connecting said distal ends together,
third section is adapted to swing between said first section and said second section when said ladder sections lie in parallel planes.
7. The combination recited in claim 6 wherein said side rails are in the form of channels and said hinges are disposed between said channels.
8. A hinge comprising a group of first members and a group of second members,
said first members being spaced from said second members,
said first members and said second members being adapted to be connected to two spaced members to swingably connect said spaced members,
each said first member and said second member-hav-v ing a gudgeon on the distal end thereof disposed in the space between said members,
and pivot means extending through said gudgeons swingably connecting said first members to said second members,
said groups of first members and second members comprise a first stack of platelike members and a second stack of platelike members respectively, said second stack of platelike members laterally spaced from said first stack,
each alternate plate in each said stack having a projection extending toward the other said stack,
a spacer between each two adjacent plates in each said stack forming stops for said first platelike members and said second platelike members,
each said projection in said first stack being disposed between two adjacent plates in said second stack,
and a pin passing through said gudgeons on the distal ends of said projections.
9. The hinge recited in claim 8 wherein said platelike members are fixed to a first section and a second section of a ladder whereby said two sections are swingably connected together,
said first section and said second section each having an end section swingably connected thereto,
said end sections adapted to swing between the space between said first section and said second section when said ladder is folded,
and said pin extends through each said section.
10. A ladder comprising a first intermediate section and a second intermediate section,
first hinge means swingably connecting said first intermediate section to said second intermediate section,
a first end section and a second end section,
second hinge means swingably connecting said first end section to said first intermediate section,
and third hinge means swingably connecting said sec ond end section to said second intermediate section,
said end sections being adapted to swing into parallel relation with said first intermediate section and said second intermediate section, said intermediate sections being adapted to swing into spaced parallel relation with each other providing a space to receive said first end section and said second end section whereby said sections are disposed in parallel planes. said sections being further adapted to swing into alignment with each other,
and stop means limiting the swinging of said sections relative to each other when said sections are in alignment,
said first hinge member, said second hinge member,
and said third hinge member comprising said stop means for limiting the swinging movement of said sections relative to each other to hold said sections in alignment during use,
said hinge means comprise a plurality of L-shaped links fixed to each said intermediate section,
a plurality of spacers disposed between said L-shaped links providing stops,
pivot means connecting said L-shaped links together whereby said end sections are disposed between said intermediate sections when said ladder is folded.
11. The ladder recited in claim 10 wherein said links connected to one intermediate section are co-planar with the spacers connected between the links attached to said other intermediate section whereby said links attached to one said intermediate section swing into engagement with said spacers between said other intermediate section when said ladder is extended.
l =l l l I
Claims (11)
1. A hinge comprising a first stack of platelike members and a second stack of platelike members, said first stack of platelike members comprising first links haVing first spacers disposed therebetween, and said second stack of platelike members comprising second links having second spacers disposed therebetween, a first end of said first links extending beyond a first end of said first spacers, and a first end of said second links extending beyond the first end of said second spacers, said first links having laterally eXtending portions extending laterally beyond the sides of said first spacers, said second links having laterally extending portions extending laterally beyond said sides of said second spacers and disposed between said laterally extending side portions of said first links, pivot means connecting said side portions of said first links to the laterally extending side portions of said second links, the ends of said first portion of said second links being adapted to engage the ends of said first spacers when said second links are swung into alignment with said first links, said first links and said second links defining a space between when said second links are swung into spaced parallel relation to said first links.
2. The hinge recited in claim 1 wherein a first channel member has spaced flanges and a web is provided, a second channel member having spaced flanges and a web is provided, said first portions of said first links are disposed between the flanges of said first channel and said first portions of said second links are disposed between the flanges of said second channel, and said channels are swingable from positions in alignment with each other to a position in spaced parallel relation to each other, the space between said channels being approximately equal to the width of a said flange on said channel whereby a third channel can be disposed between said first channel and said second channel when said channels are swung into spaced parallel relation with each other.
3. The hinge recited in claim 1 wherein said links are L-shaped and have a first leg comprising said first portion and a second leg comprising said second portion, said first leg of said first link being disposed between the flanges of said first channel, and said first leg of said second link being disposed between the flanges of said second channel, and said second leg of said first link extending beyond the said first leg in L-shaped relation, the said second legs of said first links being disposed between the said second flanges of said second channel, and said pivot means extending through said second legs of said first links and said second links.
4. The hinge recited in claim 3 wherein the first ends of said spacers terminate a distance from the ends of said links equal to twice the distance from said pivot to the edge of said links whereby the said second link engages said first spacers to hold said links in alignment with each other.
5. A hinge and ladder combination comprising, a foldable extension ladder having a plurality of substantially rigid relatively adjoining ladder forming sections, each of said sections including a pair of relatively spaced apart longitudinally extending side rails and at least one step-forming member extending transversely between said side rails and fixed thereto, said sections comprising a first section, a second section and a third section, each said section having a first side rail and a second side rail, the side rails of said ladder being made up of sections comprising the side rails of said first section, said second section, and said third section, said side rails of said first section, said second section and said third section each having a first end and a second end, the first end of the side rails of said first section being swingably connected to a second end of the side rails of said second section by means of first hinges, said second end of said second section being swingably connected to the first end of said third section by second hinges, said first hinges each comprising a plurality of first links held in spaced relation to each other by means of first spacers, and second links held together by means of second spacers, each said link being platelike in construction and being of substantially the same thickness as said spacers, each said link having a first leg and a second leg integrally joined together, thE first leg of said first links being fixed to the second end of said first section of said ladder, said first leg of said second links being fixed to said first end of said second section side rails, the distal ends of said second legs of said first links being pivotally connected to the distal ends of second legs of said second links, and pivot means connecting said distal ends together, the ends of said spacers being disposed from the ends of said first legs of said links an amount substantially equal to the distance said pivot means is from said edges whereby said first spacers engage said fist legs of said first links when said ladder is in unfolded position whereby the swinging of said first and said second sections relative to each other is limited.
6. The combination recited in claim 5 wherein said third section is adapted to swing between said first section and said second section when said ladder sections lie in parallel planes.
7. The combination recited in claim 6 wherein said side rails are in the form of channels and said hinges are disposed between said channels.
8. A hinge comprising a group of first members and a group of second members, said first members being spaced from said second members, said first members and said second members being adapted to be connected to two spaced members to swingably connect said spaced members, each said first member and said second member having a gudgeon on the distal end thereof disposed in the space between said members, and pivot means extending through said gudgeons swingably connecting said first members to said second members, said groups of first members and second members comprise a first stack of platelike members and a second stack of platelike members respectively, said second stack of platelike members laterally spaced from said first stack, each alternate plate in each said stack having a projection extending toward the other said stack, a spacer between each two adjacent plates in each said stack forming stops for said first platelike members and said second platelike members, each said projection in said first stack being disposed between two adjacent plates in said second stack, and a pin passing through said gudgeons on the distal ends of said projections.
9. The hinge recited in claim 8 wherein said platelike members are fixed to a first section and a second section of a ladder whereby said two sections are swingably connected together, said first section and said second section each having an end section swingably connected thereto, said end sections adapted to swing between the space between said first section and said second section when said ladder is folded, and said pin extends through each said section.
10. A ladder comprising a first intermediate section and a second intermediate section, first hinge means swingably connecting said first intermediate section to said second intermediate section, a first end section and a second end section, second hinge means swingably connecting said first end section to said first intermediate section, and third hinge means swingably connecting said second end section to said second intermediate section, said end sections being adapted to swing into parallel relation with said first intermediate section and said second intermediate section, said intermediate sections being adapted to swing into spaced parallel relation with each other providing a space to receive said first end section and said second end section whereby said sections are disposed in parallel planes, said sections being further adapted to swing into alignment with each other, and stop means limiting the swinging of said sections relative to each other when said sections are in alignment, said first hinge member, said second hinge member, and said third hinge member comprising said stop means for limiting the swinging movement of said sections relative to each other to hold said sections in alignment during use, said hinge means comprise a plurality of L-shaped links fixed to each said intermediate section, a plurality of spacers disposed between said L-shaped links providing stops, pivot means connecting said L-shaped links together whereby said end sections are disposed between said intermediate sections when said ladder is folded.
11. The ladder recited in claim 10 wherein said links connected to one intermediate section are co-planar with the spacers connected between the links attached to said other intermediate section whereby said links attached to one said intermediate section swing into engagement with said spacers between said other intermediate section when said ladder is extended.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00357926A US3848699A (en) | 1973-05-07 | 1973-05-07 | Interlocking bucking hinge and ladder combination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00357926A US3848699A (en) | 1973-05-07 | 1973-05-07 | Interlocking bucking hinge and ladder combination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3848699A true US3848699A (en) | 1974-11-19 |
Family
ID=23407600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00357926A Expired - Lifetime US3848699A (en) | 1973-05-07 | 1973-05-07 | Interlocking bucking hinge and ladder combination |
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| Country | Link |
|---|---|
| US (1) | US3848699A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3980157A (en) * | 1975-09-22 | 1976-09-14 | Detroit Marine Engineering Corporation | Stowing hinge for boat ladder |
| US4246981A (en) * | 1979-08-17 | 1981-01-27 | Truth Incorporated | Portable observation stand |
| US4461369A (en) * | 1981-03-30 | 1984-07-24 | Amador Hydraulic Services Limited | Articulated boom and assembly therefor |
| US5350038A (en) * | 1993-02-01 | 1994-09-27 | Lazarus Jonathan F | Foldable extension ladder and ladder sections therefor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US513012A (en) * | 1894-01-16 | Folding ladder | ||
| US612201A (en) * | 1898-10-11 | William | ||
| US1587383A (en) * | 1924-09-22 | 1926-06-01 | Kennett Charles Edward | Convertible ladder |
| US2782075A (en) * | 1955-04-04 | 1957-02-19 | Fagan Roscoe | Collapsible bench |
| US3231045A (en) * | 1986-01-20 | 1966-01-25 | Lavrard Georges Louis | Collapsible ladder |
-
1973
- 1973-05-07 US US00357926A patent/US3848699A/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US513012A (en) * | 1894-01-16 | Folding ladder | ||
| US612201A (en) * | 1898-10-11 | William | ||
| US1587383A (en) * | 1924-09-22 | 1926-06-01 | Kennett Charles Edward | Convertible ladder |
| US2782075A (en) * | 1955-04-04 | 1957-02-19 | Fagan Roscoe | Collapsible bench |
| US3231045A (en) * | 1986-01-20 | 1966-01-25 | Lavrard Georges Louis | Collapsible ladder |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3980157A (en) * | 1975-09-22 | 1976-09-14 | Detroit Marine Engineering Corporation | Stowing hinge for boat ladder |
| US4246981A (en) * | 1979-08-17 | 1981-01-27 | Truth Incorporated | Portable observation stand |
| US4461369A (en) * | 1981-03-30 | 1984-07-24 | Amador Hydraulic Services Limited | Articulated boom and assembly therefor |
| US5350038A (en) * | 1993-02-01 | 1994-09-27 | Lazarus Jonathan F | Foldable extension ladder and ladder sections therefor |
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