JPH022971Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a cap for bolts, etc., which protects the heads of a plurality of bolts attached in an annular manner to a flange joint.

"Conventional technology" For example, in the hopper of a concrete pump,
As shown in FIG. 5, a stirrer 1 is provided.
This stirrer 1 consists of a plurality of stirring blades 3 attached to a stirring shaft 2 rotated by a drive device (not shown).The stirring shaft 2 is horizontally disposed inside a hopper 4. The rotating shaft 5 is connected to both ends of the rotating shaft 5, and left and right connecting shafts 6, 6 are connected to both ends of the rotating shaft 5, projecting outside the hopper 4, and rotatably supported on the side wall of the hopper 4. . The rotating shaft 5 and each connecting shaft 6 are connected by a flange connection in which a flange 5a at the end of the rotating shaft 5 and a flange 6a at the end of the connecting shaft 6 are joined by a plurality of bolts 7. They are interconnected, and each bolt 7 is attached from the inside of the hopper 4.

"Problems that the invention attempts to solve" By the way, in the concrete pump mentioned above,
When fresh concrete is put into the hopper 4, the stirrer 1 is naturally immersed in the fresh concrete, and at this time, each bolt 7 of the flange joint is also immersed in the fresh concrete. Therefore, when it becomes necessary to remove each of the bolts 7 during maintenance and inspection work, the ready-mixed concrete has already adhered to the head 7a of each bolt 7 and has hardened. It was extremely troublesome to remove it by digging it out with a chisel or the like.

The present invention was developed in view of the above circumstances, and aims to provide a cap for bolts, etc., which protects bolts, etc. of the above-mentioned flange joints from adhesive materials such as fresh concrete, and facilitates attachment and detachment of bolts, etc. purpose.

``Means for Solving the Problems'' In order to achieve the above object, the present invention provides rubber caps for bolts, etc. that protect the heads of a plurality of bolts attached in an annular manner to a flange joint. A pair of half-split cap bodies that are assembled together to form an annular shape are each provided with a fitting hole into which the head of the bolt is fitted.

``Function'' When the bolt cap of the present invention is attached to the heads of a plurality of bolts that are attached in an annular manner to the flange joint of a stirrer as described above, the bolt cap of the present invention is One cap body is attached to the bolt head, and the other cap body is attached from the other side of the stirring shaft, so that both cap bodies protect the heads of all the bolts.

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

The drawing shows a state in which a cap 10 is attached to the heads 7a of a plurality of bolts 7 attached in an annular manner to the flange joint of the agitator 1. In this embodiment, the bolts 7 are hexagonal holes. The number of bolts is 6.

The cap 10 has a hole in the center with an inner diameter slightly larger than the outer diameter of the rotating shaft 5 of the stirring shaft 2, and the outer diameter is approximately the same as the flange 5a at the end of the rotating shaft 5, and is made of nitrile rubber or the like. A pair of cap bodies 1 are made by dividing an annular member made of rubber into two halves.
1 and 11, and three fitting holes 12 into which the heads 7a of the bolts 7 are fitted are formed on one side of each cap body 11 in accordance with the positions of each bolt 7, A protrusion 12a is formed on the inner surface of each fitting hole 12 to fit into a hexagonal hole of the head 7a.

Thus, in the cap 10 having the above structure, one cap main body 11 is attached from one side of the stirring shaft 2 by fitting the head 7a of each bolt 7 into each fitting hole 12, and the other cap body 11 is attached to the other side of the stirring shaft 2. By attaching the other cap body 11 in the same manner, the cap body 11 is installed in the state shown in the figure. The cap 10 prevents fresh concrete from adhering to the head 7a of each bolt 7, making it easy to attach and detach each bolt 7. Furthermore, since the cap 10 is made of rubber, fresh concrete hardly sticks to the cap 10 itself.
Even if it sticks, its adhesion is weak and can be easily peeled off and removed.

Furthermore, since the cap 10 is split in half, the stirring shaft 2 of the stirrer 1 will not get in the way when it is attached or detached. Further, each half of the cap main body 11 is provided with a plurality of fitting holes 12, and the heads 7a of each bolt 7 are fitted into these fitting holes 12, so that these bolts 7 do not interfere with each other. Misalignment of the cap 10 is prevented. Therefore, the cap 10 is more firmly attached to the bolt 7 than, for example, if a rubber cap is simply attached to each bolt 7. Therefore, there is no risk that the cap 10 will loosen or come off while the stirrer 1 is in use.

When the cap 10 is attached, it is preferable to apply an adhesive to the contact surfaces between the cap bodies 11, 11 and the flange 5a, since the cap 10 will be more firmly attached. In this case, the cap 10 can be easily removed using a dissolving agent depending on the type of adhesive.

Further, in the above embodiment, each cap body 11
Although the fitting hole 12 having the protrusion 12a is formed in the above, it goes without saying that the shape of the fitting hole 12 changes depending on the shape of the head of the bolt 7. Furthermore, it goes without saying that the number of fitting holes 12 formed in each cap body 11 depends on the number of bolts 7.

Furthermore, the above-mentioned cap is not only used to protect the head of the bolt at the flange joint; for example, the cap 1 in FIG.
0', it is also used to protect the nut 13 of the flange joint, and can be widely used to protect not only the flange joint but also various attachment parts of various devices.

``Effects of the invention'' As explained above, the cap for bolts, etc. of the present invention has a fitting hole in which the head of the bolt, etc. fits into each half-ring-shaped rubber cap body. Since multiple bolts, etc. in a row are protected by a pair of cap bodies, the bolts, etc. can be securely held from adhesive materials such as fresh concrete, and the stirring shaft, etc. of the stirrer can be protected. It can be easily attached and detached even if there is a problem, and it is securely attached to a bolt or the like, so there is no risk of it coming off while the stirrer or the like is in use.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, where Figure 1 is a side view and Figure 2 is a side view of Figure 1.
3 is a sectional view taken along the - arrow in FIG. 2, FIG. 4 is a sectional view showing another embodiment, and FIG. 5 is a main part showing the agitator in the hopper of a concrete pump. It is a top view of a fracture. 7... Bolt, 10... Cap, 11... Cap body, 12... Fitting hole.

Claims (1)

[Scope of utility model registration request] In a cap for a bolt, etc. that protects the heads of a plurality of bolts attached in an annular shape to a flange joint, a pair of half-split cap bodies made of rubber are combined with each other to form an annular shape. A cap for a bolt, etc., characterized in that each of the caps is provided with a fitting hole into which the head of the cap is fitted.