TWI542779B - Telescopic ladder - Google Patents

Description

Extension ladder

The present invention relates to a ladder, and more particularly to an extension ladder.

A common ladder is a single ladder structure, which comprises two ladder rods arranged in parallel with each other and a cross bar spanning between the two ladder bars, the crossbar serving as a support step. When the ladder of the single ladder structure is used, since it has no fixed structure, it needs to stand against the support to stand, is easy to dump, and has low safety. In order to enhance the safety of the use of ladders, a ladder has appeared. However, when the ladder is used, the two ladders need to be opened and supported on the ground, which requires a large working space. In addition, the use of the above two types of ladders is highly fixed, which makes the use of the ladders very limited. Longer ladders are required when picking up high-altitude items, while longer ladders take up more space due to their larger size, higher center of gravity, reduced safety, and inconvenient handling.

In view of the above situation, it is necessary to provide a ladder that occupies a small space and is safe to use.

An extension ladder comprising a ladder frame and two support assemblies, the ladder frame comprising two parallel sleeves, two telescopic rods respectively detachably received in the corresponding sleeve rods, and detachably spaced apart from the two sets of rods and the a plurality of crossbars between the telescopic rods, each telescopic rod being adjustably received in the corresponding sleeve, the ladder frame being a telescopic structure, each support assembly comprising a cylinder block and telescopically coupled to the cylinder block a support member, the cylinder block is detachably connected to the corresponding sleeve, the support member can be extended or retracted inside the cylinder block or partially protruded from the cylinder block under the driving action of the cylinder block to adjust the ladder The height of the support.

The extension ladder of the invention adopts a support component to support the ladder frame, and a triangular support structure is formed between the support component, the ladder frame and the ground, thereby enhancing the stability and safety of the extension ladder as a whole. Since the telescopic ladder is in operation, the support assembly is substantially vertically disposed on the ground and supports the ladder frame, thereby saving work space. In addition, when it is not needed, the ladder frame and the support assembly of the extension ladder can be separately disassembled, which is convenient to carry and reduces the storage space.

Figure 1 is an assembled perspective view of the extension ladder of the present invention.

2 is an exploded perspective view of the extension ladder shown in FIG. 1.

3 is a perspective view of the telescopic rod of the telescopic ladder shown in FIG. 2.

4 is an assembled perspective view of the crossbar and the locking assembly of the extension ladder shown in FIG. 2.

Figure 5 is a perspective cross-sectional view of the crossbar and locking assembly of the telescopic ladder of Figure 4.

Figure 6 is a perspective view of the movable member of the extension ladder shown in Figure 2.

Referring to FIG. 1 , an extension ladder 100 according to an embodiment of the present invention includes a ladder frame 10 , two base assemblies 30 disposed at one end of the ladder frame 10 , and two support assemblies 50 supported between the ladder frame 10 and the two base assemblies 30 . The ladder frame 10, the base assembly 30 and the support assembly 50 together form a triangular support structure.

The ladder frame 10 includes two sets of rods 12 arranged in parallel with each other, two telescopic rods 14 respectively received in the two sets of rods 12, a plurality of cross rods 16 spanning between the two sets of rods 12 and the two telescopic rods 14, and fixed to the crossbar 16 locking assembly 18 at one end.

Referring to FIG. 2 together, the sleeve rod 12 has a substantially hollow rectangular rod shape, and a receiving groove 121 having a cross-section of a "work" shape is formed in the axial direction, and the receiving groove 121 is for receiving the telescopic rod 14. One end of the sleeve 12 is also provided with a mounting groove 123 for mounting the base assembly 30. The sleeve 12 is spaced apart from the plurality of mounting holes 125, and the plurality of mounting holes 125 are arranged in a line along the longitudinal direction of the sleeve 12. A plurality of mounting holes 125 extend transversely through the sleeve 12 for threading the plurality of crossbars 16.

Referring to FIG. 3 together, the telescopic rod 14 is a steel rod having a cross-section of "work" shape, and each telescopic rod 14 is movably and adjustably received in the receiving groove 121 of the set of rods 12, and can be sleeved. The storage slot 121 of the 12 is built in and out. The mounting hole 125 of the corresponding sleeve 12 of the telescopic rod 14 is provided with a plurality of mounting holes 141. The mounting holes 141 of the telescopic rod 14 are in one-to-one correspondence with the mounting holes 125 of the sleeve 12, and between the two adjacent mounting holes 141 The separation distance is equal to the separation distance between two adjacent mounting holes 125. A fixing claw 143 is detachably provided at one end of the mounting groove 123 of the telescopic rod 14 away from the sleeve 12, and the fixing claw 143 is substantially bent and hooked for fixing the telescopic ladder 100 to the shelf or the like. In the place. When the claw 143 is not required to be fixed, for example, when the extension ladder 100 is supported on a clean wall surface, the fixing claw 143 can be detached.

Referring to FIG. 4 , the plurality of cross bars 16 are corresponding to the mounting holes 125 of the sleeve 12 and the mounting holes 141 of the telescopic rod 14 , and are fixed to the sleeve 12 or the telescopic rod 14 . When the telescopic rod 14 is completely inserted into the corresponding sleeve 12, the mounting hole 141 of the telescopic rod 14 is coaxial with the mounting hole 125 of the sleeve 12, and the two ends of the cross rod 16 are respectively disposed. A corresponding mounting hole 125 is formed in the sleeve 12, and a mounting hole 141 is formed in the telescopic rod 14 coaxially with the mounting hole 125. When the working height of the telescopic ladder 100 needs to be adjusted and the telescopic rod 14 is pulled out of the sleeve 12 by a certain length, so that the telescopic rod 14 partially protrudes outside the sleeve 12, a part of the mounting hole 141 of the telescopic rod 14 is exposed to the sleeve. Outside the rod 12, another portion of the mounting hole 141 is still received in the sleeve 12 and coaxial with a portion of the mounting hole 125 in the sleeve 12. At this time, the two ends of the part of the crossbar 16 respectively pass through the mounting holes 125 of the two sets of the rods 12 on the portion where the telescopic rods 14 are not accommodated, and the part of the crossbars 16 simultaneously penetrates the portion of the sleeves 12 on which the telescopic rods 14 are accommodated. The mounting hole 125 and the mounting hole 141 formed on the telescopic rod 14 coaxial with the mounting hole 125 are disposed on the mounting hole 141 of the telescopic rod 14 exposed on the outside of the sleeve 12.

The crossbar 16 includes a rod body 161 and a stopper portion 163 and a connecting portion 165 formed at opposite ends of the rod body 161. The stopper portion 163 has a flange shape and a diameter larger than the diameter of the rod body 161. When the rod body 161 is inserted into the mounting hole 125 or the mounting hole 141, the stopping portion 163 is clamped on the sleeve rod 12 or the telescopic rod 14 to prevent the cross rod 16 from coming out of the mounting hole 125 or the mounting hole 141. . When the two ends of the rod body 161 are respectively disposed on the two sets of the rods 12, the stopping portion 163 is clamped on the outer side of one of the sets of rods 12, and the connecting portion 165 is protruded from the outer side of the other set of rods 12; When the ends are respectively disposed on the two telescopic rods 14, the stopping portions 163 are clamped on the outer side of one of the telescopic rods 14, and the connecting portion 165 protrudes from the outer side of the other telescopic rods 14. The connecting portion 165 is substantially flat and is formed by a projection of the rod body 161 facing away from the end surface of the stopper portion 163 and protruding beyond the sleeve 12 or the telescopic rod 14. The connecting portion 165 includes a surface 1651, a side surface 1653 perpendicularly connected to the surface 1651, and an end surface 1655 facing away from the rod body 161. Both the surface 1651 and the side surface 1653 are adjacent to the rod body 161, and the end surface 1655 is cylindrical and tangential to the side surface 1653. The connecting portion 165 defines a connecting hole 1657 on the surface 1651. The connecting hole 1657 is perpendicular to the axis of the rod body 161 and penetrates the connecting portion 165 for mounting the locking assembly 18. The connecting portion 165 is further provided with a holding hole 1659 on the side surface 1653. The axis of the locking hole 1659 is perpendicular to the axis of the connecting hole 1657.

Referring to FIG. 5 together, the locking assembly 18 is mounted on the connecting portion 165 of the crossbar 16 for locking the crossbar 16 to prevent the crossbar 16 from being in the sleeve 12 during use. Bounce or escape occurs in the mounting hole 125 and the mounting hole 141 of the telescopic rod 14. The locking assembly 18 includes a housing 181 pivotally connected to the connecting portion 165, a rotating shaft 183 disposed on the housing 181, a supporting member 185, an elastic member 187 and a holding member 189.

The housing 181 includes a body 1811 and two protruding arms 1813 protruding from one end of the body 1811. The main body 1811 has a substantially cylindrical shape, and a receiving hole 1812 is formed in the axial direction. A threaded connecting portion (not shown) is disposed in the receiving hole 1812. The two protruding arms 1813 are disposed in parallel and are located on opposite sides of the connecting portion 165 and are parallel to the surface 1651 of the connecting portion 165. The two protruding arms 1813 are respectively provided with through holes 1815 corresponding to the connecting holes 1657. The rotating shaft 183 is bored and received in the through hole 1815 and the connecting hole 1657 to rotate the housing 181 about the rotating shaft 183 with respect to the crossbar 16. In this embodiment, the support member 185 is a bolt disposed on one end of the body 1811 away from the protruding arm 1813 and screwed into the internal thread of the receiving hole 1812. The elastic member 187 and the holding member 189 are both received in the receiving hole 1812. The elastic member 187 is compressed, and the other end abuts the supporting member 185 , and the other end abuts the holding member 189 , so that the holding member 189 partially protrudes from the receiving hole 1812 and abuts against the end surface 1655 or the side surface 1653 of the connecting portion 165 . When the holding member 189 is pressed against the end surface 1655, the locking assembly 18 is rotated about the rotating shaft 183. Under the elastic force of the elastic member 187, the holding member 189 always abuts the end surface 1655 during the rotation and slides along the end surface 1655. To the side 1653. When the receiving hole 1812 is rotated to be coaxial with the latching hole 1659, the latching member 189 is pushed into the latching hole 1659 by the elastic force of the elastic member 187 due to the loss of the stop, and the locking component 18 is clamped on the crossbar 16. Cooperating with the stopping portion 163, the cross bar 16 is firmly fixed between the two sets of the rods 12 and the two telescopic rods 14.

Referring to FIG. 2 again and referring to FIG. 6 together, the two base assemblies 30 are parallel to each other, and are respectively disposed at one end of the two sets of rods 12 and provided with the mounting slots 123. Each base assembly 30 includes a fixing member 32, a first fastener 33 disposed on the fixing member 32, a movable member 34 movably received in the fixing member 32, and a second fastening member connecting the fixing member 32 and the movable member 34. Firmware 36. The structure of the fixing member 32 is substantially the same as that of the sleeve 12, and is also provided with a receiving groove (not shown) having a cross-section of "work". One end of the fixing member 32 is convexly formed with a mounting portion 323. The mounting portion 323 has a substantially flat shape and protrudes into the mounting groove 123. A fixing hole 325 is defined in one end of the fixing member 32 away from the mounting portion 323 , and the fixing hole 325 extends transversely through the fixing member 32 . The first fastener 33 is disposed through the sleeve 12 and the mounting portion 323 to fix the fixing member 32 to the sleeve 12. The movable member 34 is adjustably received in the receiving groove of the fixing member 32, and has a structure substantially the same as that of the telescopic rod 14. The movable member 34 is an I-beam structure, and a plurality of mounting holes 341 are spaced apart from each other. The plurality of mounting holes 341 are arranged in a line along the longitudinal direction of the movable member 34, and both extend transversely through the movable member 34. When the movable member 34 is received in the fixing member 32 and the upper mounting hole 341 is coaxial with the fixing hole 325 of the corresponding fixing member 32, the second fastening member 36 is disposed through the coaxial mounting hole 341 and the fixing hole 325. The fixing member 32 and the movable member 34 are relatively fixed. In the present embodiment, the first fastener 33 and the second fastener 36 are both bolts. It can be understood that the first fastener 33 and the second fastener 36 can be other types of fasteners such as screws or pins.

The two support assemblies 50 are parallel to each other, and one end thereof is correspondingly disposed on the two base assemblies 30, and the other end is respectively connected with the two sets of rods 12 to support the sleeve rod 12. The support assembly 50 is generally perpendicular to the base assembly 30 such that the extension ladder 100 is a solid triangular support structure and is relatively space efficient. In the present embodiment, the support assembly 50 is a telescopic cylinder. The support assembly 50 includes a first connecting member 52, a cylinder block 54 coupled to the first connecting member 52, a support member 56 movably disposed on the cylinder block 54, and a second connecting member 58 coupled to the support member 56.

The first connecting member 52 is substantially fork-shaped and is held at the junction of the sleeve 12 and the telescopic rod 14 and corresponds to a crossbar 16. The crossbar 16 is disposed on the sleeve 12, the telescopic rod 14 and the first connecting member 52, and the three are fixedly connected. The cylinder block 54 is fixedly coupled to one end of the first connecting member 52, and the supporting member 56 is fixed to one end of the cylinder block 54 away from the first connecting member 52. The support member 56 can be extended or retracted inside the cylinder block 54 by the driving action of the cylinder block 54 or can be held at an arbitrary telescopic length. The second connecting member 58 is disposed at one end of the supporting member 56 away from the cylinder block 54 and has a substantially fork shape, and is clamped and fixed to the joint of the fixing member 32 and the movable member 34. The second fasteners 36 are simultaneously disposed on the second connecting member 58, the fixing member 32 and the movable member 34 to securely connect the second connecting member 58, the fixing member 32 and the movable member 34. It can be understood that, in order to obtain different support heights, the second connecting member 58 can be clamped and fixed to other parts of the movable member 34. For example, the second connecting member 58 can be held at any mounting hole 341 on the movable member 34. And the second fastening member 36 is inserted through the mounting hole 341 and the second connecting member 58 to lock the second connecting member 58 to the movable member 34. Similarly, the first connecting member 52 can also be clamped and fixed on any mounting hole 125 of the sleeve 12, at any mounting hole 141 on the telescopic rod 14, or other parts.

When the extension ladder 100 of the present embodiment is used, it is first required to be assembled. The assembling process is as follows: First, the two telescopic rods 14 are respectively received in the corresponding sleeves 12, and the telescopic rods 14 are extended from the receiving slots 121 by a length corresponding to the required supporting height, and the mounting holes 141 on the telescopic rods 14 are The corresponding mounting hole 125 on the sleeve 12 is coaxial. The first connecting member 52 of the support assembly 50 is then held at the joint of the sleeve 12 and the telescopic rod 14. Next, a crossbar 16 is threaded and fixed to the joint of the sleeve 12, the telescopic rod 14 and the support assembly 50, and a locking assembly 18 is mounted on the crossbar 16 and the crossbar 16 is locked. Then, the remaining crossbars 16 are fixed to the corresponding mounting holes 125 and the mounting holes 141 of the telescopic rods 14, and the fixing claws 143 are mounted on the telescopic rods 14, and the ladder frame 10 is assembled. Then, the mounting portion 323 of the two base assembly 30 is mounted in the mounting slot 123, and the second connecting members 58 of the two supporting assemblies 50 are respectively fixed to the corresponding base assembly 30, and the extension ladder 100 is assembled. Finally, the level of the two base assemblies 30 is placed on the ground so that the extension ladder 100 is in an upright working state, and the extension length of the support member 56 is adjusted by the cylinder block 54, so that the support member 56 is maintained at the required telescopic length. Thereby, the support height of the support assembly 50 is adjusted, so that the extension ladder 100 is suitable for different working environments.

When the extension ladder 100 of the present embodiment is not required to be used, the extension ladder 100 can be detached for handling and storage. First, the ladder frame 10, the base assembly 30, and the support assembly 50 are each separated. Then, the crossbar 16 is detached from the sleeve 12 and the telescopic rod 14, so that the telescopic rod 14 can be completely accommodated in the sleeve 12. Finally, the base assembly 30 and the support assembly 50 are shortened to the shortest length and collected in one place with the detached ladder frame 10.

The extension ladder 100 of the present invention adopts the ladder frame 10, the base assembly 30 and the support assembly 50 to support each other to form a triangular support structure, which enhances the stability and safety of the extension ladder 100 as a whole. Because the extension assembly 100 is in operation, the support assembly 50 is substantially vertically disposed on the base assembly 30 and supports the ladder frame 10, thereby saving work space. In addition, when it is not needed, the ladder frame 10, the base assembly 30 and the support assembly 50 of the extension ladder 100 can be separately disassembled, which is convenient to carry and reduces the storage space.

It can be understood that the extension ladder 100 of the embodiment can be used as a ladder of a single ladder. It is only necessary to detach the base assembly 30 and the support assembly 50 from the ladder frame 10 during use, and to erect the ladder frame 10 in the place of use.

It can be understood that the locking assembly 18 can be omitted. When the extension ladder 100 is assembled, only the fasteners such as bolts need to be inserted into the connecting holes 1657 of the cross bar 16 to fix the cross bar 16 to the sleeve 12 or the telescopic rod 14 . In addition, it is ensured that the crossbar 16 does not jump or escape from the mounting hole 125 of the sleeve 12 and the mounting hole 141 of the telescopic rod 14.

It can be understood that the base assembly 30 can be omitted, and when the extension ladder 100 is used, only the support assembly 50 needs to be assembled on the ladder frame 10, and the ladder frame 10 is placed in the use place, so that the support assembly 50 is substantially perpendicular to the ground, The ladder frame 10, the support assembly 50 and the ground may be formed into a substantially stable triangular support structure.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

100‧‧‧Extension ladder

10‧‧‧ ladder

12‧‧‧ sets of rods

121‧‧‧ receiving trough

123‧‧‧Installation slot

125,341‧‧‧ mounting holes

14‧‧‧ Telescopic rod

141‧‧‧Installation holes

143‧‧‧fixed claws

16‧‧‧crossbar

161‧‧‧ rod body

163‧‧‧stop

165‧‧‧Connecting Department

1651‧‧‧ surface

1653‧‧‧ side

1655‧‧‧ end face

1657‧‧‧connection hole

1659‧‧‧ card holder

18‧‧‧Locking components

181‧‧‧Shell

1811‧‧‧ Ontology

1812‧‧‧ receiving hole

1813‧‧‧ convex arm

183‧‧‧ shaft

185‧‧‧Support

187‧‧‧Flexible parts

189‧‧‧ holding parts

30‧‧‧Base assembly

32‧‧‧Fixed parts

323‧‧‧Installation Department

325‧‧‧Fixed holes

33‧‧‧First fastener

34‧‧‧moving parts

36‧‧‧Second fasteners

50‧‧‧Support components

52‧‧‧First connector

54‧‧‧Cylinder block

56‧‧‧Support

58‧‧‧Second connector

no

100‧‧‧Extension ladder

10‧‧‧ ladder

12‧‧‧ sets of rods

14‧‧‧ Telescopic rod

143‧‧‧fixed claws

16‧‧‧crossbar

18‧‧‧Locking components

30‧‧‧Base assembly

32‧‧‧Fixed parts

34‧‧‧moving parts

50‧‧‧Support components

52‧‧‧First connector

54‧‧‧Cylinder block

56‧‧‧Support

58‧‧‧Second connector

Claims (10)

An extension ladder comprising a ladder frame and two support assemblies, wherein the ladder frame comprises: two parallel sleeves, two telescopic rods respectively detachably received in the corresponding sleeve rods, and detachably spaced apart from the Two sets of rods and a plurality of cross bars between the two telescopic rods, each telescopic rod is adjustably received in the corresponding set of rods, so that the ladder frame is a telescopic structure, and each support assembly comprises a cylinder block and is telescopically connected a support member on the cylinder block, the cylinder block detachably connecting a corresponding sleeve, the support member being capable of extending or retracting inside the cylinder block or partially extending the cylinder block under the driving action of the cylinder block To adjust the support height of the ladder. The telescopic ladder of claim 1, wherein the sleeve is provided with a receiving groove in the axial direction, and the sleeve is spaced apart from the plurality of mounting holes, and the plurality of mounting holes extend transversely through the sleeve, the telescopic rod The I-shaped steel structure is adjustably received in the receiving groove, and the mounting hole of the telescopic rod corresponding to the sleeve rod is provided with a plurality of mounting holes, and the distance between the two adjacent mounting holes is equal to two adjacent mounting holes. The distance between the two ends of the crossbar is respectively disposed on the corresponding mounting hole of the two sets of rods and the mounting hole coaxial with the mounting hole. The extension ladder of claim 1, wherein the extension ladder further comprises two base assemblies respectively connected to the two sets of rods, wherein the two support assemblies are respectively connected to the two base assemblies away from one end of the ladder frame. The ladder frame, the base assembly and the support assembly generally form a triangular support structure. The extension ladder of claim 3, wherein the base assembly comprises a fixing member, a first fastener and a movable member movably received in the fixing member, the fixing member forming a mounting portion at one end, the mounting portion Removably connected to the end of the sleeve, the first fastener is disposed through the sleeve and the mounting portion, and the other end of the fixing member is transversely penetrated and provided with a fixing hole, and the movable member is spaced apart and arranged with a plurality of mounting holes. A plurality of mounting holes on the movable member extend transversely through the movable member. When each movable member is correspondingly received in a fixing member, any mounting hole on the movable member can be coaxial with the fixing hole to allow fasteners such as bolts to be worn. The movable member is thus fixed relative to the fixing member. The telescopic ladder of claim 4, wherein the support assembly further includes a first connecting member disposed at one end of the cylinder block and a second connecting member disposed at an end of the supporting member away from the cylinder block, the first The connecting member is detachably coupled to the ladder frame, and the second connecting member is detachably coupled to the corresponding base assembly. The extension ladder of claim 5, wherein the first connecting member is substantially fork-shaped and can be clamped at any one of the mounting holes of the sleeve, and one of the plurality of cross bars passes through the sleeve a mounting hole of the rod and passing through the first connecting member to fix the sleeve with the first connecting member; or the first connecting member can be clamped at any mounting hole of the telescopic rod, the horizontal The rod is disposed on the mounting hole of the telescopic rod and the first connecting member, thereby fixing the telescopic rod to the first connecting member; the second connecting member can be clamped at any mounting hole of the movable member, The base assembly further includes a second fastener, the second fastener is disposed through the mounting hole of the movable member and the second connecting member to fix the second connecting member and the movable member. The extension ladder of claim 1, wherein the crossbar comprises a rod body and a stopping portion and a connecting portion respectively formed at opposite ends of the rod body, the stopping portion having a diameter larger than a diameter of the rod body, When the two ends of the rod are respectively disposed on the two sets of rods, the stopping portion is clamped on the outer side of the set of rods, and the connecting portion protrudes from the outer side of the other set of rods; the two ends of the rod body are respectively disposed In the two telescopic rods, the stopping portion is clamped on the outer side of one of the telescopic rods, the connecting portion protrudes from the outer side of the other telescopic rod, the connecting portion is provided with a holding hole, and the telescopic ladder further comprises a locking assembly The locking component includes a housing and a retaining member disposed in the housing, and the latching member protrudes into the latching hole at one end to lock the crossbar to the corresponding sleeve or the telescopic rod . The extension ladder of claim 7, wherein the connecting portion is further provided with a connecting hole, the axis of the connecting hole is perpendicular to the axis of the holding hole, and the locking assembly further comprises a rotating shaft, the housing The main body and the two protruding arms are formed at one end of the connecting body, and the receiving member is received in the receiving hole. The two protruding arms are located at the two ends of the connecting hole. The rotating shaft is disposed on the two protruding arms and the connecting hole, and the housing is rotatable about the rotating shaft to make the receiving hole coaxial with the holding hole, so that the holding member protrudes from the receiving hole Hold the hole inside the card. The telescopic ladder of claim 8, wherein the locking assembly further comprises an elastic member and a supporting member, wherein the supporting member is fixedly disposed at one end of the receiving hole away from the rotating shaft, and the elastic member is received in the receiving hole And one end abuts the support member, and the other end abuts the retaining member to push the retaining member against the retaining hole by an elastic restoring force. The extension ladder of claim 1, wherein the telescopic rod is detachably provided with a fixing claw away from one end of the sleeve.