JP3068466B2 - Construction aid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction assisting tool mainly used for rebuilding a wooden building and a joist hook thereof.

[0002]

2. Description of the Related Art In wooden construction, rebuilding work is performed for fine adjustment of the verticality of pillars and the like. Conventionally, a joist hook as shown in FIG. 7 has been used for this rebuilding work. The joist hook has a configuration in which an elongated substantially rectangular plate-shaped joist support plate B is pivotally supported via a support shaft C on a plate-shaped joist hook plate A formed in a substantially J shape. In the joist hook plate A, a side engaging portion A2 engaged with the outer surface of the joist extends from the tip side of the upper surface engaging portion A1 which is engaged along the upper surface of the joist (not shown). A locking projection A4 is provided at the lower end A3 of A2. The joist hook plate A has a bending angle of the side engaging portion A2, that is, a lower end surface A5 of the upper surface engaging portion A1 abutting on the upper surface of the joist and a left end surface of the side engaging portion A2 facing the outer surface of the joist. A6 is an obtuse angle larger than a right angle. The joist supporting plate B has a right end face B2 of a lower end B1 abutting on an inner side surface of the joist, and a through hole B4 is formed in the upper end B3, and a hook of a lever hoist is formed in the through hole B4. Are engaged. The lever hoist is provided with a load chain, and one end of the lever hoist is connected to a spar hook hooked to a beam. The joist hook locks the joist hook plate A along the upper and outer surfaces of the joist and the joist support plate B along the inner surface of the joist when performing the rebuilding work. As a result, the locking projection A4 of the joist hook plate A comes into contact with the outer surface of the joist, and this locking projection A
4 and the lower end B1 of the joist support plate B sandwich the joist. Thereafter, when the load chain is hoisted up by operating the lever hoist, the joists and the girders are pulled, and the verticality of the pillar is finely adjusted, so that the rebuilding work is performed.

[0003]

When the above conventional joist hook is hooked on the joist and pulled by a lever hoist, the lower end portions A3, B1 of the joist hook plate A and the joist supporting plate B with the support shaft C as a fulcrum. The load acts on.
At this time, in the joist hook plate A, the bending angle θ of the side engaging portion A2 is obtuse, the lower end portion A3 extends in the direction opposite to the pulling direction of the joist support plate B, and the pulling direction is applied to the lower end portion A3. Is provided, a strong load acts on the side of the locking projection A4. For this reason, the wedge-shaped locking projection A4 has deeply penetrated into the outer surface of the joist, causing a problem that a wedge-shaped dent is generated in the joist or the corner portion of the joist becomes brittle and chipped. In this case, since the joist restoration work is involved, the whole rebuilding work is delayed, which is inefficient. Further, since the joist hook has a structure in which one joist hook plate A and joist support plate B are overlapped, the tensile load acting surface of joist hook plate A and the load acting surface of joist support plate B ( (The load acting on the chain of the lever hoist) is inevitably deviated, and the joist hook plate A is deformed outward by the action of the load.

Accordingly, an object of the present invention is to provide a joist hook of a construction assisting tool which can perform a rebuilding operation without damaging the joist and can improve the work efficiency.

[0005]

To achieve the above object, the present invention provides a lever hoist, a girder hook connected to a load chain of the lever hoist, and a joist hook engaged with the lever hoist hook. The girder hook includes a girder hook plate locked along the upper and outer surfaces of the girder, and a girder support plate fixed to the girder hook plate and locked along the upper and inner surfaces of the girder. The spar hook plate is provided with a substantially rectangular locking plate extending downward from the mounting plate and fixed by welding or the like between two rectangular mounting plates, and a plurality of bolts are inserted through the mounting plate. Holes are formed at regular intervals, and the girder support plate is provided with
An insertion piece inserted between the mounting plates is formed, and the insertion piece has a thickness substantially equal to a separation distance between the mounting plates, and the insertion piece penetrates in a plate thickness direction. The bolt passage holes are at regular intervals, and are formed to be equal to the intervals of the bolt insertion holes formed in the mounting plate, and further, a chain bracket for connecting a chain is rotatably mounted on the girder support plate. The joist hook is provided with an upper surface locking plate that is locked along the upper surface of the joist and a side joist plate that has a wedge-shaped inward protrusion that is locked on the outer surface of the joist. A joist support plate abutting on the inner surface of the joist is pivotally supported on the hook plate, and the joist abutment surface of the upper surface locking plate and a side surface locked on the outer surface of the joist. The inner angle formed by the joist-facing surface of the locking plate is 80 to 85 degrees, and The joist hook plate has a pair of plate-shaped upper locking plates arranged in parallel, and is integrally fixed with the base end of the plate-shaped side locking plate interposed between the distal ends of the upper locking plates. A construction assisting tool characterized in that a plate-shaped joist support plate is pivotally supported between base ends of the upper surface locking plate.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an overall configuration of a lever hoist provided with a joist hook of a construction assistant according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a joist hook of the construction assistant. .

The lever hoist 1 has a structure in which a joist hook 4 is attached to a hoist body 2 around which a load chain 3 is wound, and together with the joist hook 4 and the girder hook 9, the verticality of a pillar in a wooden building is reduced. Used for rebuilding work for fine adjustment. Joist hook 4
Is a construction assisting tool for a wooden building, and has a structure in which a joist support plate 6 is rotatably supported on a joist hook plate 5. The joist hook plate 5 is composed of two upper locking plates (mounting plates) 5.
1, the side locking plate 52 is sandwiched and integrally formed. Each upper surface locking plate 51 is locked along the upper surface 11a of the joist 11, and is formed in an elongated rectangular shape from an iron plate having the same thickness. The upper locking plate 51 has upper and lower end surfaces 51a and 51b that are linear.
1b is a joist contact surface, which is in contact with the upper surface 11a of the flat joist 11. A circular bolt insertion hole is formed on the base end side of each upper surface locking plate 51. The side locking plate 52 is locked to the outer side surface 11b of the joist 11, and is formed using an iron plate that is equal to or thicker than the plate thickness of the upper locking plate 51. This side locking plate 52
Has a substantially rectangular shape tapering from the upper end 52a to the lower end 52b. A wedge-shaped locking projection 52d protruding toward the outer surface 11b of the joist 11 is provided on the inner edge of the lower end 52b.

The side locking plate 52 is provided with the upper locking plate 5.
The left end surface 52c is a joist facing surface that faces the outer surface 11b of the joist 11 by being fixed to the distal end side of the first joist 1 to form the substantially L-shaped joist hook plate 5. When the joist hook plate 5 is manufactured, the side locking plate 52 is used as the upper end 5.
Each end of the upper surface locking plate 51 is overlapped on both side surfaces of 2a, and these are firmly fixed by welding, rivets, or the like. In this example, the upper surface locking plate 51 is arranged in parallel, the upper end portion 52a of the side surface locking plate 52 is inserted and sandwiched between the front ends, and the upper surface locking plate 51 is inserted into the joist contact surface 51b of the upper surface locking plate 51. Side locking plate 52
In a state where the joist facing surface 52c is at a slightly acute angle rather than a right angle, the joint between the two 51 and 52 is welded. More specifically, when the extending direction of the joist contact surface 51b along the length direction of the upper surface locking plate 51 is defined as a reference line C1, and a perpendicular C2 to the reference line C1 is assumed, the perpendicular C2 The internal angle θ formed by the extension line C3 in the extension direction of the joist facing surface 52c along the length direction of the side locking plate 52 becomes an acute angle. Is preferably formed at 70 to 95 degrees, more preferably at 80 to 85 degrees. In the illustrated example, the angle is 83 degrees.

The joist supporting plate 6 has a slender, substantially rectangular shape.
The upper surface locking plate 51 is formed of an iron plate having a thickness equal to or slightly smaller than a distance between opposing surfaces of the upper surface locking plate 51.
The joist support plate 6 serves as a joist engaging surface in which the right end surface 6b of the lower side 6a is engaged along the inner side surface 11c of the joist 11. On the upper side 6c of the joist support plate 6, a circular hook hole 6d is formed. In addition, a bolt insertion hole is formed substantially at the center of the joist support plate 6, and a bolt 60 is inserted into the hole, and the joist hook plate 5 is inserted into the joist support plate 6.
Is pivoted. At this time, after inserting the central portion of the joist support plate 6 between the upper surface locking plates 51 of the joist hook plate 5, align the bolt insertion holes, insert the bolt 60, and screw the nut. The joist supporting plate 6 is rotatably supported by the joist hook plate 5. The length of the lower portion 6a of the joist support plate 6 is set slightly shorter than the entire length of the side locking plate 52. Thereby, the joist hook plate 5 and the joist supporting plate 6 are locked to the joist 11, and the joist supporting plate 6
When a tensile load is applied to the upper side 6c of the joist support plate 6, the lower side 6a of the joist support plate 6 and the side locking plate 52
And a lower end 52b of the pair 6a and 5b approach each other under the load.
At 2b, the joist 11 is held. The distance from the bolt 60 to the lower side 6a of the joist support plate 6 is:
It is set shorter than the distance from the bolt 60 to the welded portion at the tip of the upper surface locking plate 51. Thus, when the joist support plate 6 rotates about the bolt 60, the joist support plate 6 can be inserted between the upper surface locking plates 51 of the joist hook plate 5.

The hoist body 2 is not particularly limited in configuration, but in the illustrated embodiment, the length of the load chain 3 wound around the load sheave can be adjusted by operating the operation lever 21. The operation lever 21 is capable of holding the load chain 3 in one of a hoisting or hoisting direction and a neutral state by switching the switching lever 22. Also,
The hoist body 2 has a load hook 23 rotatably provided at a position opposite to a side from which the chain is led out. The load hook 23 has an upper side 6 of the joist support plate 6.
c is rotatably mounted. In other words, the load hook 23 is hooked at its tip into the hook hole 6d formed on the upper side 6c of the joist support plate 6, while its base end (not shown) is connected to the hoist body 2 by a bearing. Makes it rotatable.

As shown in FIGS. 3 and 4, the spar hook 9 is fixed to the spar hook plate 91 and is fixed along the upper surface and the outer surface of the spar 10.
The girder 10 has a girder support plate 94 locked along the upper surface and the inner side surface. The girder hook plate 91 is
A substantially rectangular locking plate 95 extends downward from the mounting plate 97 and is fixed by welding or the like between the two rectangular mounting plates 97, 97, and the whole is substantially L-shaped. . As a result, the two mounting plates 97, 97 are opposed to each other while being separated from each other and extend from the locking plate 95. A plurality of bolt insertion holes 97a are formed in the extension at regular intervals so as to be concentric with the facing mounting plate 97.
A stop plate 96 of the spar hook plate 91 is provided with a backing plate 96 on the side where the mounting plate 97 extends.
6 is disposed on the side end surface of the locking plate 95 so as to be orthogonal to the locking plate 95. The girder support plate 94 is formed of a substantially L-shaped plate member on which an insertion piece 94a inserted between the mounting plates 97 is formed. The insertion piece 94a has a thickness substantially equal to the separation distance between the mounting plates 97, and has bolt-passing holes formed at regular intervals through the plate thickness direction. The interval between the bolt passage holes is made equal to the interval between the bolt insertion holes 97 a formed in the mounting plate 97 of the girder hook plate 91.

[0012] The chain 3 (3
A chain fitting 93 for connection with A) is provided rotatably. The chain fitting 93 includes a girder support plate 94.
A second member 100 to which an end of the chain 3 is fixed is rotatably provided on a first member 99 fixed to the first member 99. The first member 99 is formed by bending a plate material, and has a bifurcated portion 9 at one end.
9a. Then, the girder support plate 94 is inserted into the forked portion 99a, and the both 94, 99 are bolted to the bolt 99A.
Is fixed at. The second member 100 includes a shaft portion 100a to which one end of the chain 3 is locked.
9 is rotatably provided at the other end via a pin.
A rod-shaped handle member 92 is provided at the lower end of the second member 100.
Is attached. As the handle member 92, one having a configuration capable of adjusting the length in a plurality of stages is suitably used.
For example, in the example shown in FIG. 3, the second handle member 92B is screwed into the lower part of the first handle member 92A fixed to the spar hook 91, and the third handle member 9 is screwed into the lower part of the second handle member 92B.
2C is screwed. Such a spar hook 9 is attached to the shaft 100a of the chain fitting 93 by the chain 3A.
Are connected to each other, and the girder 10 is inserted between the girder hook 91 and the girder support plate 94 and is locked thereto. The girder hook 91 and the girder support plate 94 are fixed by inserting bolts 98 into the bolt insertion holes 97a and the bolt passage holes and tightening the nuts. Depending on which bolt insertion hole 97a or the like, the bolt 98 is inserted. It is possible to lock on spars of various sizes. The chain fitting 93 is rotatable with respect to the girder hook 91, so that the chain 3A is prevented from being twisted during use.

The chain 3A has one end connected to the spar hook 9 and the other end engaged with the hook 31 at the tip of the load chain 3 wound around the hoist body 2. The hook 31 of the load chain 3 can be engaged with an arbitrary link of the chain 3A, and is provided with a stopper metal 32 so as not to release the engagement with the link. As shown in FIG. 1,
The base end is pivotally supported by the base end of the hook 31, and is constantly urged from the radially inner side to the outer side of the hook 31 so that the distal end comes into contact with the front end of the hook 31. That is, the stopper metal 32 is urged to close the opening of the hook 31, and the tip end can be rotated radially inward of the hook in opposition to the urging force. Therefore, the engagement of the chain 3A of the spar hook 9 with the hook 31 is performed by rotating the stopper metal fitting 32 in the radial direction in opposition to the urging force, and after the link is engaged with the hook 31. Since the stopper metal 32 closes the opening of the hook 31 by the urging force, the link and the hook 3
There is no danger that the engagement with 1 will be released. The link at the other end of the load chain 3 has a slightly larger diameter link 33.
Are connected to prevent the load chain 3 from coming off from the hoist body 2. The tip of the chain 3 of the lever hoist 1 may of course be fixed directly to the girder hook 9.

When the girder hook 9 is fixed to the girder 10 in this manner, the rebuilding operation is performed by the lever hoist 1 having the joist hook 4. In this work, as shown in FIG. 5, first, the joist hook 4 is hooked so as to cover the joist 11, and the joist hook plate 5 and the joist supporting plate 6 are hooked.
And sandwich the joist 11. Then, the joist supporting plate 6 is locked along the inner side surface 11c of the joist 11, and the locking projection 52d of the side locking plate 52 comes into contact with the outer side surface 11b of the joist 11 as shown by a virtual line in FIG. . In this state, the joist hook 4 is held with a slight gap between the outer surface 11b of the joist 11 and the joist facing surface 52c and between the upper surface 11a of the joist 11 and the joist contact surface 51b. . Next, while the switching lever 22 of the lever hoist 1 is in the hoisting direction, the load lever 3 is hoisted in a direction in which the joist hook 4 and the girder hook 9 approach by swinging the operation lever 21. Thus, digit 10
The joist 11 and the joist 11 come close to each other, so that a shaft set such as fine adjustment of the verticality of the column can be prepared.

During this operation, when a pulling force is applied to the upper side 6c of the joist support plate 6 via the load hook 23 by the pulling force of the lever hoist 1, the lower side 6a of the joist support plate 6 is supported by the bolt 60 as a fulcrum. The lower end 52b of the side locking plate 52 approaches, and the joist 11 is securely clamped between the both 6a and 52b. When a pulling force is applied to the upper side 6c of the joist supporting plate 6, a strong load also acts on the locking projection 52d, and the locking projection 52d digs into the joist, but the bending angle of the side locking plate 52 is an acute angle. As the load increases, the joist facing surface 52c of the base of the locking projection 52d increases.
Adhere to the outer surface 11b of the joist 11. Accordingly, the outer surface 11b of the joist and the joist facing surface 52c of the side locking plate are in close contact with each other, and the joist 11 is sandwiched between both the side locking plate 52 and the joist supporting plate 6. Therefore, the locking projection 52d does not go deeper into the outer side surface 11b of the joist 11, and the problem that a large dent is formed on the joist 11 is avoided. In this way, the joist 11 is maintained in a good condition without being damaged, so that the work of repairing the damaged portion or reinforcing the joist as in the conventional case is not required, and the rebuilding work can be performed efficiently. it can.

The joist hook 4 in the above-described embodiment is formed by drilling a plurality of bolt holes in advance and changing the pivotal support position by the bolt 60.
In addition, the size of the joist support plate 6 can be appropriately changed according to the shape and size of the joist 11.

[0017]

As described above, according to the present invention, the inner angle formed between the joist facing surface of the side locking plate constituting the joist hook plate and the joist contact surface of the upper locking plate is 80 to 85 degrees. When a load is applied to the joist by applying a pulling force to the joist support plate, the locking protrusions first bite into the joist, but immediately the joist-facing surface of the side locking plate comes into contact with the joist. Is received on the joist facing surface, and further penetration is prevented. As a result, the work can be performed without increasing the damage of the joist due to the protrusion being deeply penetrated into the joist, so that the repair work of the joist is unnecessary, and the working efficiency is improved. The present invention also provides a joist hook plate formed by extending a side hooking plate between a pair of upper hooking plates, and pivotally supporting a joist support plate between the upper hooking plates. As a result, the entire joist hook is strengthened, and the effect that the joist hook plate is deformed outward by the action of a load as in the related art can be avoided.
Furthermore, according to the present invention, a girder hook is provided, and a chain bracket for connecting the chain is rotatably provided on the girder support plate constituting the girder hook, so that the chain is twisted during use. Further, the girder hook and the girder support plate are fixed by inserting bolts into the bolt insertion holes and the bolt passage holes and tightening the nuts, and depending on which bolt insertion hole etc. the bolt is inserted. It can be locked to the spar.

[Brief description of the drawings]

FIG. 1 is a front view showing an overall configuration of a lever hoist provided with a joist hook of a construction assistance tool according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a joist hook of the construction assistant.

FIG. 3 is an explanatory view showing a use state of a lever hoist provided with a joist hook of a construction assistance tool.

FIG. 4 is an enlarged perspective view showing an upper part of a girder hook according to the embodiment of the present invention.

FIG. 5 is an explanatory view showing a state in which a joist hook of the construction assistance tool is locked to the joist.

FIG. 6 is an explanatory view showing a state in which the joist hook clamps the joist;

FIG. 7 is a front view showing a joist hook of the conventional construction assistance tool.

[Explanation of symbols]

 Reference Signs List 1 lever hoist 5 joist hook plate 6 joist support plate 11 joist 11a upper surface 11b outer surface 11c inner surface 51 upper surface locking plate 51b joist contact surface 52 side locking plate 52b tip end portion 52c joist facing surface 52d locking protrusion

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04G 21/18

Claims (1)

(57) [Claims] 1. A lever hoist, a spar hook connected to a load chain of the lever hoist, and a joist hook engaged with the hook of the lever hoist, wherein the spar hook extends along an upper surface and an outer surface of the spar. A girder hook plate to be locked, and a girder support plate fixed to the girder hook plate and locked along an upper surface and an inner side surface of the girder, wherein the girder hook plate has two rectangular mounting members. A substantially rectangular locking plate extends downward from the mounting plate and is fixed by welding or the like between the plates. A plurality of bolt insertion holes are formed in the mounting plate at regular intervals. The plate has, at an upper portion thereof, an insertion piece inserted between the two mounting plates, and the insertion piece has a thickness substantially equal to a separation distance between the mounting plates. , The bolt passing holes penetrate in the thickness direction and have a constant spacing And at least one of the bolt insertion holes formed in the mounting plate is formed at a distance equal to a distance between the bolt insertion holes. Further, a chain fitting for connecting a chain is rotatably provided on the girder support plate. A joist hook plate consisting of an upper surface locking plate that is locked along the upper surface of the joist, and a side locking plate having a wedge-shaped inward projection that is locked on the outer surface of the joist; The joist support plate abutting on the inner surface is pivotally supported pivotally,
In addition, the inner angle formed by the joist contact surface of the upper locking plate and the joist facing surface of the side locking plate locked on the outer surface of the joist is 80 to 85 degrees. The joist hook plate has a pair of plate-shaped upper locking plates arranged in parallel, and is integrally fixed with the base end of the plate-shaped side locking plate interposed between the distal ends of the upper locking plates. And a plate-shaped joist supporting plate is pivotally supported between a base end side of the upper surface locking plate.