JP2008143685A - Smooth swivel suspension - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a durable smooth turnable sling rig which prevents a sliding surface from being damaged by scoring. <P>SOLUTION: A shaft-like fastening member 1 consists of a piercing part 5 for being rotatably pierced through a shaft hole 4 formed in a housing 2 and a protruding part 6 for protruding below the housing 2. The protruding part 6 is provided with a fixed means 7 being fixed to an object to be slung and an upper part and a lower part of the shaft hole 4 of the housing 2 are respectively sealed to the piercing part 5 via sealing members 8, 9. A rolling bearing B for supporting load is formed between the shaft hole 4 of the housing 2 and the piercing part 5 between both the sealing members 8, 9 and a lubricating material is filled between both the sealing members 8, 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to the improvement of a swingable lifting tool (link bolt) used for hanging work at various work sites such as construction, construction, cargo handling, premises work, etc., especially in work in a severe working environment. The present invention relates to a smooth swivel type lifting tool having good durability that prevents galling on a sliding surface.

  For suspension work performed at various work sites, for example, a swivel holding tool (swivel coupling tool) as shown in FIG. 5 has been proposed (see, for example, Patent Document 1). The swivel suspension has a leg portion of a link member 3 bent in a substantially U-shape and is bent inward to be engaged with an opening of the housing 2, and a bolt hole formed in the housing 2 is provided with a flange. The anchor unit (bolt) 1 is assembled through the upper bush 41 and the lower bush 42, and in the assembled state, a snap ring (retaining ring) e is inserted into the groove formed in the male thread 1a of the anchor unit 1. By engaging, both bushes 41 and 42 are kept from coming off, and the whole is unitized. Reference numeral 21 denotes a suspended object.

  After being transported and stored in such a united state, it is handled in this state during use, and is carried into the field, and the anchor unit 1 is screwed and fixed to the object to be held 21 and then hooked to the link member 3. As described above, operations such as hanging work, lifting heavy objects, and reversing work are performed. In many cases, after the work is completed, the anchor unit 1 is removed from the object 21 and stored in a unitized state for reuse.

  However, in the above-described conventional swivel suspension, if the direction of the suspension load changes when the suspension object 21 is lifted or reversed, the link member 3, the housing 2, and the upper bush 41 are moved. The accompanying torque generated by the generated frictional force may cause the anchor unit 1 to loosen. In other words, since this swivel suspension receives a load due to surface contact between the lower surface of the flange portion of the upper bush 41 and the seating surface of the housing 2, the frictional resistance thereof becomes larger than the bolt tightening torque of the anchor unit 1. was there. In addition, an awkward frictional sound may be generated due to the large frictional resistance.

Thus, in order to reduce such frictional resistance, a swivel holding tool in which a rolling bearing is provided between the anchor unit 1 and the housing 2 has been proposed (see, for example, Patent Document 2). For example, as shown in FIG. 6, the swivel suspension has a housing 2 formed in a substantially hollow cylindrical shape with an open bottom, and a central hole 2 a for inserting a flanged bush 25 is formed at the center thereof. The formed rolling bearing (thrust bearing) 24 is disposed between the flange portion 25 a of the bush 25 and the seat portion 2 b formed in the housing 2. With such a configuration, the frictional resistance that generates the accompanying torque is reduced, and the generation of annoying frictional noise can be suppressed.
Japanese Patent No. 2761660 Utility Model Registration No. 3116260

  However, when a conventional swivel suspension as shown in FIG. 6 is attached to a power shovel and work is performed under harsh environmental conditions, for example, a diagonally upward or lateral load acts on the link member 3. When the link member 3 and the housing 2 rotate relative to each other, the anchor unit 1 and the bushing 25 slide in contact with a surface having a large resistance. there were.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a smooth swing-type lifting tool with good durability that prevents galling on the sliding surface.

(1) The smooth swivel type lifting tool of the present invention hangs a shaft-like fastening member 1 fixed to a suspended object, a housing 2 that rotatably supports the shaft-like fastening member 1, and a hook. And a link member 3 that is swingably supported by the housing 2,
The shaft-like fastening member 1 includes an insertion portion 5 that is rotatably inserted into a shaft hole 4 formed in the housing 2, and a protrusion portion 6 that protrudes downward from the housing 2. Is provided with a fixing means 7 to be fixed to a suspended object, and a rolling bearing B for supporting a load is provided between the shaft hole 4 and the penetrating portion 5 of the housing 2. .

  According to such a configuration, the rolling bearing B for supporting the load is provided between the shaft hole 4 of the housing 2 and the insertion portion 5 of the shaft-shaped fastening member 1. Even when the link member 3 and the housing 2 are rotated relative to each other by an obliquely upward or lateral load, the shaft-like fastening member 1 is moved by a conventional sliding bearing with respect to the shaft hole 4. Since it rotates with little resistance due to rolling resistance via the rolling bearing B instead of surface contact, a smooth turning operation is ensured, and galling is unlikely to occur on the sliding surface.

(2) The upper and lower portions of the shaft hole 4 of the housing 2 are sealed with respect to the insertion portion 5 through seal members 8 and 9, respectively, and the rolling bearing B is interposed between the seal members 8 and 9. And a sealant may be filled between the seal members 8 and 9. If it does in this way, the upper part and lower part of the shaft hole 4 of the housing 2 will be sealed with respect to the penetration part 5 of the shaft-shaped fastening member 1 penetrated by the shaft hole 4 via the sealing members 8 and 9, respectively. In addition, since the rolling bearing B is provided between the seal members 8 and 9, foreign matters such as earth and sand and water do not enter the sliding surface including the rolling bearing B from the outside. Rust on the moving surface is less likely to occur. Further, since a lubricant such as grease is filled between the seal members 8 and 9, the shaft portion including the rolling bearing B (the insertion portion 5 of the shaft-like fastening member 1), the shaft hole 4 of the housing 2, and the like. When the relative pivoting operation is smoothly performed, for example, when the link member 3 and the housing 2 are relatively rotated due to a diagonally upward or lateral load acting on the link member 3. In addition, a smooth turning operation is ensured, and the sliding surface is more unlikely to generate galling.

(3) The rolling bearing B is a semicircular arc-shaped groove 10 formed in the circumferential direction in the groove 10 having a semicircular arc cross section formed in the intermediate portion of the insertion portion 5 and the axial hole 4 of the housing 2. A plurality of steel balls 12 for supporting a suspension load may be loosely fitted between the grooves 11 in the cross section so as to freely roll. In this way, a large load can be lifted through the plurality of steel balls 12, and the relative turning operation between the shaft-like fastening member 1 and the housing 2 is smoothly performed.

(4) The seal member 8 provided between the upper portion of the shaft hole 4 of the housing 2 and the insertion portion 5 may be an oil seal or an O-ring. If it does in this way, the space between the upper part of shaft hole 4 of housing 2 and penetration part 5 can be sealed by simple composition.

(5) The seal member 9 provided between the lower portion of the shaft hole 4 of the housing 2 and the insertion portion 5 may be an oil seal or an O-ring. In this way, the space between the lower portion of the shaft hole 4 of the housing 2 and the insertion portion 5 can be sealed with a simple configuration.

(6) An externally open plug hole 13 communicating with a groove 11 having a semicircular arc cross section formed in the circumferential direction in the shaft hole 4 of the housing 2 is formed, and both the grooves are formed in the plug hole 13. A detachable plug 14 may be attached to enable insertion and removal of the plurality of steel balls 12 into and out of 10 and 11. If it does in this way, insertion exchange etc. of the steel ball 12 can be performed easily.

(7) The inlet of the grease introduction path 15 communicating with the groove 11 having the semicircular arc section at a position above the groove 11 having the semicircular arc section formed in the circumferential direction in the shaft hole 4 of the housing 2. 16 may be provided, and the grease nipple 17 may be attached to the introduction port 16. In this way, the grease can be easily filled by attaching and detaching the grease nipple 17.

  In the smooth swing type lifting device of the present invention, a rolling bearing for supporting a load is provided between the shaft hole of the housing and the insertion portion of the shaft-shaped fastening member. Even when the link member and the housing rotate relative to each other when a load is applied, the shaft-like fastening member rotates with respect to the shaft hole due to rolling resistance via a rolling bearing, so that a smooth turning operation is possible. Is ensured, and galling is less likely to occur on the sliding surface. Thereby, durability improves markedly.

Hereinafter, a smooth swing type lifting tool according to the best mode of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal front view of a smooth swivel type lifting tool, FIG. 2 is a longitudinal side view, FIG. 3 (a) is a side view of a housing, and (b) is another side view. As shown in these drawings, the smooth swivel type lifting tool includes a shaft-like fastening member 1 fixed to a suspended object (not shown), and a housing 2 that rotatably supports the shaft-like fastening member 1. And a link member 3 that is swingably supported by the housing 2 in order to hang a hook or the like. The shaft-like fastening member 1 is attached to the housing 2 that is formed in a substantially hollow cylindrical shape with an open bottom. It comprises an insertion portion 5 that is rotatably inserted into the formed shaft hole 4 and a protruding portion 6 that protrudes downward from the housing 2. The protruding portion 6 has a male screw (fixed) fixed to the object to be suspended. (Means) 7 is formed, and a hook-shaped portion 1 a is formed between the insertion portion 5 and the protrusion 6.

  On both sides of the housing 2, recessed lower portions 18 and 18 are formed for fitting the leg tips 3a and 3a bent inside the link member 3 (FIGS. 3A and 3B). The upper and lower portions of the shaft hole 4 of the housing 2 are sealed with respect to the insertion portion 5 through the seal members 8 and 9, respectively, and the housing 2 between the seal members 8 and 9 is sealed. A rolling bearing B for supporting a load is formed between the shaft hole 4 and the insertion portion 5, and a lubricant such as grease is filled between the seal members 8 and 9. The rolling bearing B includes a semicircular arc-shaped groove 10 formed in the circumferential direction in the intermediate portion of the insertion portion 5, a semicircular arc-shaped groove 11 formed in the circumferential direction in the shaft hole 4 of the housing 2, and A plurality of steel balls 12 for supporting a suspension load are loosely fitted between them, and with such a configuration, a large load can be lifted through the plurality of steel balls 12, and The relative rotation operation between the shaft fastening member 1 and the housing 2 is smoothly performed.

  The seal member 8 provided between the upper part of the shaft hole 4 of the housing 2 and the insertion part 5 is, for example, an oil seal (or O-ring), and the lower part of the shaft hole 4 of the housing 2 and the insertion part 5 The seal member 9 provided between the two is preferably an O-ring (or oil seal) fitted in a ring groove 5a formed in the circumferential direction in the insertion portion 5, for example. With such a configuration, the space between the upper and lower portions of the shaft hole 4 of the housing 2 and the insertion portion 5 can be sealed with a simple configuration, and the attachment and detachment can be easily performed. Further, an externally open plug hole 13 communicating with a groove 11 having a semicircular arc cross section formed in the circumferential direction is formed in the shaft hole 4 of the housing 2, and both grooves 10, 11 are formed in the plug hole 13. A detachable plug 14 for enabling insertion and removal of a plurality of steel balls 12 into the inside is mounted. Thereby, the insertion exchange of the steel ball 12 etc. can be performed easily by attaching or detaching the plug 14. An introduction port 16 of a grease introduction path 15 that communicates with the groove 11 having a semicircular arc cross section is provided at a position above the groove 11 having a semicircular arc shape formed in the circumferential direction in the shaft hole 4 of the housing 2. The grease nipple 17 is detachably attached to the introduction port 16. Thereby, grease can be easily filled by attaching and detaching the grease nipple 17.

  Since the smooth swing type lifting tool configured as described above is provided with a rolling bearing B for supporting a load between the shaft hole 4 of the housing 2 and the insertion portion 5 of the shaft-like fastening member 1, for example, Even when the link member 3 and the housing 2 rotate relative to each other when an obliquely upward or lateral load is applied to the link member 3, the shaft-like fastening member 1 is in a conventional manner with respect to the shaft hole 4. Instead of the surface contact by the sliding bearing as described above, it rotates with less resistance due to the rolling resistance via the rolling bearing B, so that a smooth turning operation is ensured and the sliding surface is less likely to cause galling. And the upper part and the lower part of the housing 2 are sealed with respect to the insertion part 5 of the shaft-like fastening member 1 inserted into the shaft hole 4 via the seal members 8 and 9, respectively, and the seal member Since the rolling bearing B is provided between 8 and 9, the sliding surface of the shaft portion (the insertion portion 5 of the shaft-like fastening member 1) including the rolling bearing B and the shaft hole 4 of the housing 2 Foreign matter such as earth and sand and water does not enter from the outside. Further, since a lubricant such as grease is filled between the seal members 8 and 9, the shaft portion including the rolling bearing B (the insertion portion 5 of the shaft-like fastening member 1), the shaft hole 4 of the housing 2, and the like. Is relatively smooth, and the sliding surface is less likely to be frayed. For example, a lateral load acts on the link member and the link member and the housing rotate relatively. Even in such a case, a smooth turning operation is ensured, and galling is unlikely to occur on the sliding surface. Thereby, durability improves markedly.

  FIG. 4 is a longitudinal front view of a different smooth swivel type lifting tool, and this smooth swivel type lifting tool supports a load between the shaft hole 4 of the housing 2 and the insertion part 5 of the shaft-like fastening member 1. A rolling bearing B is provided, a nut 19 is screwed into a screw portion carved in the upper part of the shaft-like fastening member 1, and a dust-proof washer 20 is interposed between the top surface of the housing 2 and the nut 19. Although not shown, a roll pin is inserted through a pin hole formed in the screw portion and the nut 19. And the sealing members 8 and 9 shown in FIG. 1 etc. are omitted. According to such a configuration, since the rolling bearing B is provided between the shaft hole 4 of the housing 2 and the insertion portion 5 of the shaft-like fastening member 1, for example, obliquely upward or laterally with respect to the link member 3. Even when the link member 3 and the housing 2 rotate relative to each other when a load is applied, the shaft-like fastening member 1 is not brought into contact with the shaft hole 4 by surface contact by a conventional sliding bearing, but is rolled. Since it rotates with little resistance by the rolling resistance via the bearing B, smooth turning operation is ensured and it becomes difficult to generate galling on the sliding surface. Although not shown in the figure, as in the previous embodiment, an externally open plug hole 13 communicating with the groove 11 having a semicircular arc cross section formed in the circumferential direction is formed in the shaft hole 4 of the housing 2. The plug hole 13 is provided with a detachable plug 14 for enabling insertion and removal of a plurality of steel balls 12 into and from both grooves 10 and 11 (see FIG. 2). . Moreover, although illustration is abbreviate | omitted, the fitting hole which fits the leg part front-end | tips 3a and 3a of the link member 3 was provided in the position (offset position) left | separated from the axial center of the axial fastening member 1 laterally, for example. Also in a link bolt, the structure using the rolling bearing B similar to this Embodiment (FIG. 4) and previous embodiment (FIGS. 1-3) is employable.

  It should be noted that the present invention is not limited to the embodiment, and it is free to make design changes or improvements as necessary, as long as it does not depart from the gist of the invention. It is not limited to a male screw, and other detachable fitting methods may be used. Further, the rolling bearing B may be provided in a plurality of stages, for example, two stages in the upper and lower directions. Moreover, as long as the sealing members 8 and 9 can seal between the shaft hole 4 and the penetration part 5 of the housing 2, appropriate structures other than an oil seal and an O-ring may be employ | adopted.

It is a vertical front view of the smooth turning type lifting tool which concerns on embodiment of this invention. It is a vertical side view of the same smooth turning type lifting tool. (A) Side view of the housing, (b) Other side view of the housing. It is a vertical front view of the smooth turning type lifting tool which concerns on different embodiment of this invention. It is a vertical front view of the conventional turning suspension tool (turning connection tool). It is a vertical front view of the another turning suspension tool.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 1 ... Shaft-shaped fastening member, 2 ... Housing, 3 ... Link member, 4 ... Shaft hole, 5 ... Insertion part, 6 ... Projection part, 7 ... Fixing means, 8, 9 ... Seal member, 10, 11 ... Groove, DESCRIPTION OF SYMBOLS 12 ... Steel ball, 13 ... Plug hole, 14 ... Plug, 15 ... Grease introduction path, 16 ... Introduction port, 17 ... Grease nipple, B ... Rolling bearing

Claims (7)

A shaft-like fastening member (1) fixed to a suspended object;
A housing (2) for rotatably supporting the shaft-like fastening member (1);
A smooth swivel type suspension device comprising a link member (3) swingably supported by the housing (2) for hooking a hook or the like,
The shaft-like fastening member (1) includes an insertion portion (5) that is rotatably inserted into a shaft hole (4) formed in the housing (2), and a protrusion that protrudes below the housing (2). The protrusion (6) is provided with a fixing means (7) that is fixed to the object to be suspended, and the shaft hole (4) of the housing (2) and the insertion part (5). ) Is provided with a rolling bearing (B) for supporting a load.   The upper part and the lower part of the shaft hole (4) of the housing (2) are sealed with respect to the insertion part (5) via seal members (8) and (9), respectively, and both the seal members (8) The smooth turning type according to claim 1, wherein the rolling bearing (B) is provided between (9), and a lubricant is filled between the seal members (8) and (9). Hanging tool.   The rolling bearing (B) is provided in a circumferential direction in a groove (10) having a semicircular arc cross section formed in the middle portion of the insertion portion (5) and in a shaft hole (4) of the housing (2). A plurality of steel balls (12) for supporting a suspension load are loosely fitted between the groove (11) having a semicircular arc cross section formed on the inner surface of the groove (11). Or the smooth swivel type lifting tool of 2.   The seal member (8) provided between the upper part of the shaft hole (4) of the housing (2) and the insertion part (5) is an oil seal or an O-ring. Or the smooth turning type lifting tool of 3.   The seal member (9) provided between the lower part of the shaft hole (4) of the housing (2) and the insertion part (5) is an oil seal or an O-ring. 5. The smooth swivel type lifting tool according to any one of claims 4 to 4.   An externally open plug hole (13) communicating with a groove (11) having a semicircular arc cross section formed in the circumferential direction is formed in the shaft hole (4) of the housing (2), and the plug hole (13 ) Is equipped with a detachable plug (14) for allowing the plurality of steel balls (12) to be inserted into and removed from the grooves (10) (11). The smooth turning type lifting tool according to any one of claims 3 to 5.   Grease introduction that communicates with the groove (11) having the semicircular arc cross section in a position above the groove (11) having a semicircular arc cross section formed in the circumferential direction in the shaft hole (4) of the housing (2). The smooth swivel type suspension according to any one of claims 3 to 6, wherein an introduction port (16) for the passage (15) is provided, and a grease nipple (17) is attached to the introduction port (16). Ingredients.

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