JPS6212596A - Expansion type jib for tower type crane, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a telescopic jib for a tower crane, etc.
comprising at least two jib sections nested within each other and a carriage movable over each jib section, each jib section having two running tracks extending in the longitudinal direction of the jib, the running tracks being located on the same jib side; The tracks are laterally staggered and the carriage includes a body and at least a pair of support devices located in front of each other, one on each side, each support device of the pair including at least one support member. a coupling means between the support member and the body for permitting lateral movement relative to the support member and thus the body of the support device; at least one active roller running on a running track from the jib section, said jib being in a lateral direction of the support member of the paired support device in a position where the carriage moves from one jib section to the other jib section; an active roller including means for controlling movement and mounted on the support member;
This relates to a telescoping jib of a type that moves from the running track of one jib part to the running track of the other jib part.

This type of jib allows the carriage to run along the entire length of the jib at any position on the jib section. The carriage can run on the leg jib and the tip jib, but it is not necessary to pull out and retract the tip at the same time.

A closed jib section rather than an open one results in a much simpler construction and is often also lighter in weight. This is very important, for example, for long jibs consisting of three or more jib sections.

A jib of this type is known from French Patent No. 2,211.393.

In this jib, all running tracks are located at the same level over the entire length of the jib. The active rollers of the carriage are each connected to the carriage body by a deformable parallelogram and mounted in a holder. This structure allows a lateral translational movement of the corresponding roller.

The parallelogram has two end positions, each end position corresponding to the position of a roller connected to the parallelogram on one of the respective running tracks of the jib section. The displacement of the deformable parallelogram from one end position to another is automatically ascertained by the sensors associated therewith. These sensors are designed to detect movement of the carriage from one jib section to another, and are designed to detect movement of the carriage from one jib section to another. and a cam that cooperates with said stop when attempting to move to the section. This cam is swingably mounted on the carriage body and is connected by a lever to one deformable parallelogram link.

Each time the carriage moves from one jib section to another, the active rollers move laterally from one track to the other, which increases wear on the rollers and tracks. Furthermore, during lateral displacements, axial forces act on the bearings of the active rollers. These rollers are designed to withstand radial forces only.

This results in premature wear of the rollers.

The running tracks from each jib section must always be located at the same level.

The deformable parallelogram links of each carriage support also tend to assume a vertical position due to the 1F of the carriage and, in most cases, the loads that the carriage supports.

When this deformable parallelogram link is in an end position, the corresponding roller will be forced with its outer flange against the running track, and the roller will be braked.

When the link is in the other end position, the rollers are now pushed outwards and have the potential to leave the running track.

When the parallelogram links of the support devices of either pair of front and rear pairs move from one end position to another, the carriage body moves upwardly considerably. Therefore, very strong forces are required to change the position of the links and therefore to move the carriage from one jib section to another, especially when the carriage is under load.

It is an object of the present invention to solve these problems and to provide for the lateral translation Mih that occurs in the active rollers of the carriage when the carriage moves from one jib section to the other.
It is an object of the present invention to provide a telescoping jib of the above-mentioned type which can easily and effectively carry out the above operations, hardly causing any wear of the active rollers or running track, and which does not require strong force.

° For this purpose one telescoping jib of the invention carries the active rollers of the paired support devices in a position where they have to be moved from the running track of one jib section to the running track of the other jib section. Lifting means for lifting from the track and continuing as long as the means for moving the support device laterally are operative, a portion of the lifting means being attached to the carriage and another portion of the lifting device in said position. attached to the end of one of the jib sections, one section containing a pair of auxiliary tracks and the other section containing rollers cooperating with the auxiliary tracks.

Since the active rollers of the support device do not come into any contact with the running track during lateral displacement, no wear of the rollers or the track occurs.

During said lateral displacement, the displacement in the height direction is very small. During this displacement, the carriage is supported by parts cooperating with means for lifting the active rollers. These parts do not move laterally.

In a particular embodiment of the invention, the portion of the lifting means mounted on one jib section in the position where the carriage moves from one jib section to the other is located at the tip of the jib section located on the crane tower side. is installed on.

In one particular embodiment of the invention, the active rollers of the paired support device are fixed at a height relative to the carriage body, and the means for lifting these active rollers is provided by lifting the active rollers of the carriage body. It has become a means.

Preferably, the auxiliary tracks form a pair of running tracks mounted on the end of one of the jib sections, and the auxiliary rollers are active rollers mounted on the carriage body.

In an advantageous embodiment of the invention, coupling means are mounted on the carriage body, connecting between the support member of each support device and the carriage body and allowing a lateral displacement of the support device relative to the carriage body; It includes a laterally extending guideway and a member guided by the guideway and supporting a support member.

In an advantageous embodiment of the invention, the means for controlling the lateral movement of the support device comprises a guideway mounted on the jib section located on the tower side in the position where the carriage moves from one jib section to the other. , a member guided by this guideway and mounted on a corresponding support device.

In a preferred embodiment of the invention, the carriage includes locking means for a support device which is moved laterally relative to the body, the locking means being such that said support device has to change its running trajectory. preventing outward lateral movement of the support device except when

Other details and advantages of the invention will become apparent from the following description of a telescoping jib for tower cranes and the like.

It is to be understood that this description is by way of example only with reference to the accompanying drawings, in which like reference numerals indicate like elements throughout the drawings.

The telescoping jib shown in the drawings is positioned in a known manner at the top of a byron (not shown) of a tower crane.

The jib includes two closed jib sections nested within each other. That is, these jib parts are an outer leg jib part l and an inner tip jib part 2.

Each jib part l, 2 has a triangular cross section and consists of two lower side profiles 3, a top profile 4 and a tube 5 connecting these profiles.

All these cross-sectional shapes have a rectangular cross section.

The cross-sectional profile 3 of the jib part 2 is lower than the cross-sectional profile of the jib part l.

As can be seen in FIG. 1, the jib portion l, 2 has a cross-sectional shape
The top surfaces of the jib are located at the same level and the tops on the same side of the jib are laterally staggered and adjacent to each other.

These top surfaces are horizontal running tracks 6 or 7 of the carriage 9.
form.

In the drawings, the running trajectory formed by both cross-sectional bodies 3 of the leg jib portion l is indicated by reference numeral 6, and the running trajectory formed by the cross-sectional shaped bodies 3 of the tip jib portion 2 is indicated by reference numeral 7. .

The carriage 9 includes a body 10 on which is mounted a pulley 11 for the lifting cable. The body 10 is attached to cables 12 at the front and rear, and moves the carriage 9 in both the front and rear directions. Driving the pulleys and displacing the carriage is done in a known manner, and known means for doing so are not shown here.

Extending and retracting the jib is also done in a known manner. For the sake of simplicity, known means for sliding the jib part 2 relative to the jib part 1 are not shown in the figures. During this sliding, the jib section 2
Only one row of rollers 8 is shown, which is arranged in the leg jib section so as to guide it in a known manner.

Four support devices a13 are connected to the body 10 of the carriage 9, and these support devices are arranged such that one pair is located at the front, one pair is located at the rear, and the paired support devices are located in front and behind each other. .

Each support device fi13 includes a vertical support member 14 made of a tube projecting upwardly from the body 10, and a support member 14
an active or running roller 15 mounted rotatably about an axis transverse to the jib at the top end of the frame 1;
6 and a small carriage (16, 17) consisting of four active rollers to which the bottom end of the support member 14 is fixed.

The small carriages 16, 17 of each support device 13 are connected to a pair of U-shaped rails 1 which serve as running tracks for the active rollers 17.
It is mounted so that it can move laterally on the body 10 by means of a guide path consisting of 8. These rails extend laterally parallel to each other, have openings facing each other, and are integral with the body 10 of the carriage 9.

A holding plate 21 is fixed to the outer ends of both rails 18 by penetrating the angle iron material 22 with threaded bolts 23 and nuts 24.
A spring 19 is mounted around a rod 20 extending transversely to the body 10 between and a projection 25 mounted on the frame 16 so as to project downwardly; located below. Also,
The protrusion 25 loosely surrounds the rod 20. The spring 19 is connected to the small carriage 16.17 and therefore to the support device 1
3 is pressed laterally toward the middle of the body 10 as a whole.

A retaining plate 21 supports the lot 20, holds the free ends of the rails 18 apart, and prevents the small carriages 16, 17 from slipping off the rails 18.

Inward movement of the support 113 is limited by guide rollers 26. This guide roller 26 is connected to the holder 27
The holder 27 is mounted on the support member 14 on the pylon side and extends from the outer vertical side 28 or 29 of the side profile 3 of the jib part l or 2. The vehicle travels on a guided trajectory. therefore,
The support element 14 is located outside this side 28 or 29, and the active roller 15 of the support device 13 runs on the running track 6 or 7 of the corresponding profile 3.

At the tip of the leg jib part l, the cross-sectional shape body 3 of both measuring parts
are chamfered, and the side portions 28 of these cross-sectional shapes 3 are connected to the side portions of the tip jib portion 2.

At the tip (i.e. where the support device 13 has to be moved from one jib part to the other), the sides of the profile 3 form guide ramps for the guide rollers 26; The said rollers 26, and therefore these rollers, are used in the 13th century.
Get one six.

The jib includes lifting means, which raise the support device 13 slightly when it moves laterally, so that the active rollers 15 do not come into contact with the running track 6 or 7.

The lifting means comprises two auxiliary running tracks 30 mounted on the leg jib l and auxiliary active rollers 31 cooperating with these auxiliary running tracks 30.

Both auxiliary running tracks are formed by the top surfaces of two support parts 32 extending in the length direction of the leg jib part l.

The front supports 32 are each welded to a vertical support plate 33 at the tip of the leg jib l, which is welded to two cross beams 34, which The end is welded to the bottom surface of the lower cross-sectional shape part 3 of the leg jib part l.

Both ends of the support portion 32 are wedge-shaped, and the upper surfaces of these support portions form a running track, with one end being somewhat elevated and the other end being at the same height. The same applies to the lower surface of the support portion 32.

Mounted on the body 10 of the carriage 9 are four auxiliary or running rollers 31, the front two located between the support members 14 of the front pair of support devices 13 and the rear two between the rear pair of support devices 13. between the supporting members 14 of the supporting device 13.

Both auxiliary active rollers 31 on the same side of the body 10 cooperate with the same auxiliary running track 30, but one behind the other.

Each auxiliary active roller 31 is rotatably mounted about a lateral horizontal axis in a bearing 35 mounted on a lateral tube 36. The tubes are welded on corresponding sides of the body 10 to rails 18 which project with respect to the body 10 at corresponding ends.

The underside of the support 32 forms a guide channel 37 which cooperates with a curved lever 39 of the locking mechanism 38 . This locking mechanism 38 is adapted to prevent outward lateral movement of the support device 13. Although this lateral movement is resisted by the spring 19, it is possible that it may occur.

This lever 39 is mounted rotatably about a transverse horizontal axis at the top of one of the six pairs of rails 18 forming a guideway for the small carriage 6.17.

One arm of the hidden lever 39 is attached to the rail 1 at an upward angle.
8 and the free end of the lever is curved.

The other arm of lever 39 extends downwardly along rail 18. A spring 40 mounted between this other arm and a retaining plate 41 fixed to the rail 18 urges said arm towards the rail 18. In the rest position of the lever 39 (i.e. in the position shown in FIGS. 5 and 6), said further arm is located towards the rail 18.

In this position, the arm end forms a stop 42, which stops the frame 1 of the small carriage 16.17.
6 cooperates with one of the fingers 43 of the plate 44 fixed to the bottom of the plate 44. The plate 44 has two fingers 43 that protrude outside the guide path formed by both rails 18.

When the upper arm of the lever 39 is swung downwards in cooperation with the guideway 37, the other arm of this lever 39 is moved away from said guideway and no longer holds the finger 43, thus removing the small carriage. The lateral outward movement of is, 17 and, as a result, the lateral outward movement of the corresponding support device I12 is unobstructed.

When the carriage 9 moves on the leg jib l, the active rollers 15 of the four support devices 13 run on the running track 6.

At the same time, a guide roller 26 mounted on the support device runs on the guide path 28 of the leg jib portion l, and prevents the front and rear pairs of support devices 13 from moving away from each other. 6 pairs of support parts 3
13 are prevented from approaching each other by a locking device 38 mounted between it and the body 10 of said carriage 9.

At the same time, one active roller 31 moves both auxiliary running tracks 3.
It makes contact with 0 and rides on it. Front support device 1113
The active rollers 15 of are raised away from the running track 6.

The carriage 9 is still supported by the leg jib, but the front part of the carriage is not supported by the support fi13 but by the front auxiliary active roller 31. The raised height of the front part of the carriage 9 is only a small amount, for example 0.5 to 0.9 cm, and does not require any strong force even when the carriage is carrying a load.

Immediately thereafter, the guide roller 26 runs on the slope at the end of the side guide 28 of the profile 3 of the leg jib l and moves up to the side guide 29 of the profile 3 of the tip jib 2.

The guide path of the guide roller 26 can be changed using both front support devices i.
13 towards each other, this movement is assisted by springs 19 pushing the support device 13 inwardly. For safety reasons, an outer guideway running parallel to one side 28 may be provided in the leg jib l, forcing the guide roller to follow the slope of the side 28.

The lateral movement of the front support device 13 takes place without any difficulty and without wear on the active rollers 15 or the running tracks 6, 7, since the active rollers 15 do not engage in any way with the running tracks. It will be done.

The lateral movement is completed when the front lever 39j5 and the front auxiliary roller 31 reach the wedge-shaped end on the jib tip side of the support section 32.

At this end, the lever 39 on each side of the carriage 9 returns to its original position and its lower arm enters between the fingers 43 of the plate 44 fixed on the side corresponding to the support device 13, moving the support device to its new position. to be locked. Front auxiliary activity roller 30
descends to its original level and descends onto the running track 7 of the tip jib part 2 instead of the running track 16 of the leg jib part l.

The change in the running trajectory for the rear pair of support devices 13 is carried out in the same manner as the trajectory change for the front pair of support devices 113.

The trajectory change for the support device 13 is performed in the same manner when the carriage moves from the tip jib section 2 to the tip jib section l, but the lateral displacement of the support section fi13 occurs outward, and the front Or the rear pair of supports move away from each other. During the movement of the carriage from the jig section 2 to the jib section I, the front and rear support devices 13 are raised, moved outwards and then lowered to their original level.

At this time, the corresponding guide rollers move from one guide path 29 to the guide path 28, and the carriage body is suspended from the support 32 via the front and rear auxiliary active rollers 30.

The movement of the carriage from one jib section to the other jig section is carried out easily without causing any wear and without requiring any great force.

It should be understood that the invention is not limited to the embodiments described above, but that many changes may be made in shape, arrangement, construction, and number of parts used to implement it.

In particular, the number of jib parts is not limited to two, and the present invention can also be applied to a jib having three or more jib parts. In this case, the pillar side end of each jib section is provided with two supports, and these supports form an auxiliary track so that the carriage can be moved from one jib section to the other in the manner described above. .

A locking or clamping device for locking a small carriage must naturally have as many locking positions as there are jibs.

The locking device does not necessarily have to act in both left and right lateral directions. When the actuated device prevents outward displacement of the small carriage, inward movement is made impossible by the guide rollers. It is enough just to be done.

The locking or clamping device does not necessarily have to have a lever that cooperates with the fingers of the plate. There may also be a swingable bottle that can fit into a hole in the guide rail of the small carriage.

The running tracks of the jib section also do not necessarily have to be located at the same level; if the running tracks are located at different levels, the shape of the auxiliary running track should be adjusted accordingly, with one end being higher than the other. It has to be made higher.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a telescoping jib according to the invention. FIG. 2 is a sectional view taken along the line ■--■ in FIG. 1, and is an enlarged view showing the carriage in the raised position. FIG. 3 WS is a sectional view through a part of the jib shown in FIGS. 1 and 2, and is to the same scale as FIG. 2, showing the carriage in a raised position; FIG. 4 is a plan view showing the rear half of the carriage on a different scale, and shows the running track along line IIJ. FIG. 5 is an enlarged view showing details of the carriage shown in FIG. 4. FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5,
It is a figure which shows a part of auxiliary running track with a broken line. 3 in the drawing, 1.2...Jib part, 3.4...Cross-sectional body, 5...Tube, 6.7...Travel track, 9
... Carriage, I O- ... Body, 13 ... Support device, 14 ... Support member, 15 ... Running roller,
16...Frame, 17...Activity roller, 18...
・Rail, l9...Spring, 20...Lot, 21・
...Holding plate, 30...Auxiliary running track, 31...
- Auxiliary activity roller, 42...stop, 43...finger piece,
44...Plate agent Patent attorney Kono
Showa Fig, 1 Fig, 3

Claims (1)

[Claims] (1) A telescoping jib for a tower crane, etc., comprising:
Each jib part (1 and 2) comprises at least two jib parts (1 and 2) slidably nested in each other and a carriage (9) movable over these jib parts (1 and 2).
or 2) has two running tracks (6) extending along its length.
or 7), the running tracks (6 and 7) located on the same jib side are laterally offset, and the carriage (9) is connected to the body (10) with at least one pair of support devices (
13), these supporting devices being located one on each side one behind the other, each pair of supporting devices having at least one supporting member (14) and a body between the supporting member and the body. (10), connecting means (16, 17, 18) for allowing relative lateral movement of the support member and thus of the body (10) of the support device (13); at least one active roller (15) rotatably mounted on the jib part (1 or 2) and running on a running track from the jib part (1 or 2) on the corresponding jib side; ) is the carriage (9) and one of the jib parts (
means (26-29) for controlling the lateral movement of the support member (14) from the pair of support devices in the position of movement from the jib section 1 or 2) to the other jib section, mounted on the support member (14); In a telescoping jib, in which the active roller (15) is adapted to move from the running track (6 or 7) of the first jib part (1 or 2) to the other jib part (2 or 1), paired Active roller (15) of support device (13)
If they are on the running track (6) of one jib section (1 or 2)
or 7) comprising means (30-36) for lifting from the running track (6 or 7) in the position where it has to be moved from the running track to the running track of another jib part (2 or 1);
This continues at least as long as the means (26-29) for laterally displacing the support device (13) are activated, and the parts (31, 35, 36) of said lifting means (30-36)
is mounted on the carriage (9), and the other parts (30
, 32, 33, 34) are mounted at the end of one of the jib parts (1 and 2) in said position, one of its parts containing a pair of auxiliary tracks (32); Telescopic jib, characterized in that the other part includes rollers (31) cooperating with this auxiliary track (32). (2) In the telescopic jib according to claim 1, the carriage (9) of the lifting means moves from one jib part (1 or 2) to the other jib part (2 or 1). The part (30, 32, 33, 34) attached to one of the jib parts (1 or 2) in the position is attached to the tip of the jib part (1) located on the crane pillar side. Telescoping jib. (3) A telescoping jib according to claim 1 or 2, in which the active roller (15) of the paired support device (13) has a height relative to the carriage body (10). Telescoping jib fixed to , characterized in that the means (30-36) for lifting said active rollers (15) are means for lifting a carriage body (10). (4) In the telescoping jib according to claim 3, the auxiliary track (32) includes a traveling track pair (30) attached to the end of one of the jib parts (1 and 2). A telescopic jib characterized in that the auxiliary roller (31) is an active roller mounted on the carriage body (10). (5) In the telescopic jib according to claim 4, the running tracks (6 and 7) from each jib part (1 and 2) are located at the same level, and the auxiliary track (32) is located at the same level. A telescopic jib characterized in that both ends are inclined in opposite directions to form inclined surfaces connecting a certain level difference. (6) A telescoping jib according to claim 4 or 5, wherein the carriage (9) includes a pair of support devices (13) at its front end and a pair of support devices (13) at its rear end, and the lifting means (30-36) is the carriage body (10)
It is characterized in that it includes at least two pairs of auxiliary rollers (31), one pair in front of and one pair behind it, and the paired active rollers are mounted at a constant distance from each other in the lateral direction. Telescoping jib. (7) In the telescopic jib according to any one of claims 1 to 6, the support device (1
Connecting means (16, 17, 18) connecting the support member (14) of each support device (13) and the carriage body (10) are attached to the body (10) so as to allow lateral displacement of the support device (13). Telescoping type, characterized in that it includes a dovetail and laterally extending guide path (18) and members (16, 17) guided by this guide path (18) and supporting a support member (14) jib. (8) The telescoping jib according to claim 7, wherein the guide path (18) includes at least one running track, and the guided members (16, 17) run on the track. A telescoping jib characterized in that it includes a small carriage with at least one active roller (17). (9) In the telescopic jib according to any one of claims 1 to 8, the support device (1
3) said means (26-29) for controlling the lateral movement of the jib part (1 or 2) located on the pillar side in the position where the carriage (9) moves from one jib part (1 or 2) to the other jib part (1 or 2) ) and a guideway (28 or 29) attached to the
A telescopic jib characterized in that it comprises a member (26) guided by this guideway (28 or 29) and mounted on a corresponding support device (13). (10) A telescoping jib according to claim 9, in which each jib section (1 and 2) includes two longitudinal cross-sectional profiles (3), each profile (3) transverse to the jib. includes one surface (6 or 7) extending in the direction of the running track (6 or 7) and the outward facing surface (28 or 27).
The surface (28) of the jib portion (1) located on the pillar side forms a slope extending inward at the pillar extraction end, and this slope prevents lateral displacement of the support device. Guideways (28) for controlling means (26-29)
or 29). (11) In the telescoping jib according to claim 9 or 10, the support device (13
) includes a guided member (26) of the means (26-29) for controlling the lateral displacement of the guide roller (26);
This guide roller (26) is mounted on the support member (14) of the support device (13) and said means (26-29)
) A telescopic jib characterized in that it cooperates with the guideway (28 or 29) of the. (12) A telescopic jib according to any one of claims 9 to 11, in which the carriage (9) carries a spring (19) for each support device (13). a telescopic jib, characterized in that the spring is mounted between the support device (13) and the carriage body (10) and applies a lateral force on the support device (13) towards the center of the body; . (13) A telescopic jib according to any one of claims 1 to 12, in which the carriage (9) has locking means (3) for the support device (13).
7, 38), the locking means being movable laterally relative to the body (10), and said support device (
13) is characterized in that said locking means (37, 38) prevent an outward lateral movement of the support device (13) except when the travel trajectory (6 or 7) has to be changed. Telescoping jib. (14) In the telescoping jib according to claims 4 and 13, the locking means (
37, 38) contains a control lever (39) for each support device (13) of the carriage, which control lever (39)
) is attached to the main body (10), and when the support device (13) moves from the running track of one jib part (1 or 2) to the running track of the other jib part (2 or 1), the auxiliary roller A telescopic jib characterized in that it cooperates with an auxiliary track (32) which cooperates with (31). (15) Telescopic jib according to claim 14, characterized in that the auxiliary track (32) has a wedge-shaped end. (16) In the telescoping jib according to claims 8 and 14, the support device (13)
the locking means (37, 38) comprising a locking element (42) integral with the control lever (39) and at least one holding element (43) cooperating with this locking element (42); This holding element (43) is the support member (14) of the support device (13).
) and the carriage body (10).
16, 17, 18) small carriage (16, 17)
A telescopic jib characterized by being attached to the top. (17) Telescoping jibs for tower cranes, etc., as described herein or illustrated in the accompanying drawings.