JPS5811928Y2 - anchor bolt device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to anchor bolt devices, and more particularly to anchor bolts that use an expandable member that can be expanded to engage a hole in a masonry or concrete structure for attaching a bolt member. Regarding bolt devices.

Anchor bolt devices of the type that utilize devices that expand like petals are widely used in the field of tightening work.

Generally, in this type of anchor bolt device, the expandable device is attached to a reduced diameter portion of the bolt member, and the expandable device is pushed into the expandable device into the reduced diameter portion. A beveled end portion is provided for spreading out.

Expandable members are generally one of two types.

One type consists of two members held in place around a bolt member by a band member of the type.

Another type consists of a single piece, consisting of two parts joined along one edge by a section adapted to cut when the piece is unfolded, and having a split along the other edge. Ru.

Both types mentioned above have problems with uniform firm holding power.

In the case of two members, since the two members do not move simultaneously, one member may slip relative to the other, resulting in an asymmetric wedging action around the bolt member.

Because when two parts are joined by a separable part, the two parts tend to separate more at the edge of the split than in a hanger joined by a separable part. If the separable parts do not separate, a problem arises in which the wedge action becomes asymmetric.

It is desirable for the anchor bolt device to have an expansion member that is integrally constructed and that ensures uniform expansion around the expanding portion of the bolt member to ensure a firm holding force when the bolt member is tightened. It is.

It is an object of the present invention to provide an improved anchor bolt device of the type that uses an expandable member.

Another object of the present invention is to provide an anchor bolt device of the type that uses an expandable member that can be expanded manually or the like.

Yet another object of the present invention is to provide a type of anchor bolt device that utilizes an expandable member that has a more even retention force.

The foregoing and other objects generally consist of a cylindrical section of maximum diameter threaded at least in part, a section for forcing apart a tapered sleeve at one end, and a section between said sections. This is accomplished by providing a cylindrical bolt member having a cylindrical undercut portion.

The tubular sleeve member is mounted around the cylindrical undercut of the bolt member and forms a one-piece member with a slot extending between the ends.

The sleeve member is provided with a hole circumferentially spaced 180° from the crack, through which the forward end of the sleeve member is connected to the end of the bolt member adjacent the sleeve draining portion. Another crack extends beyond.

The sleeve member is provided with a device for holding the sleeve member stationary by friction with respect to the bolt member during installation of the bolt member.

The above-mentioned and other features of the present invention will be more fully understood from the following description and accompanying drawings of preferred embodiments of the present invention.

Referring to FIG. 1, the anchor bolt device of the present invention includes a cylindrical bolt member 2, and the bolt member has a cylindrical portion undercut from a chamfered portion 6 at the rear end.
cylindrical portion) 10 with a cylindrical portion 9 of maximum diameter.

One section 4 of the cylindrical section 9 is threaded 8 from the end adjacent the chamfer 6 .

In the embodiment shown, the thread ends before the undercut cylindrical part 10.

The diameter of the cut-down cylindrical portion 10 is not smaller than the diameter of the root of the screw 8.

The undercut cylindrical part 10 thus has at least the same strength as the threaded part 4.

The end of the bolt member 2 opposite the threaded section 4 is formed into a sleeve widening section 12, which forces the sleeve apart.

The sleeve widening portion 12 has a diameter cut-down portion 10.
, to a diameter substantially equal to the outer diameter of the thread.

Sleeve expansion portion 12 also includes a cylindrical extension portion 16 having a diameter equal to the outer diameter of the screw and projecting forwardly from ramped portion 14 .

A unitary sleeve member 18, preferably formed from sheet metal, is tubularly formed around the undercut cylindrical portion 10 of the bolt member 2.

The length of the sleeve member 18 is substantially the same as the undercut cylindrical portion 10 of the bolt member 2.

The sleeve member 18 has a split 20 extending between its ends, as shown in FIGS. 2 and 3, with the split 20 being as narrow as possible.

The sleeve member 18 is provided with a hole 22 located closer to the rear end adjacent the threaded portion of the bolt member than to the front end adjacent the sleeve expansion portion 12 .

Hole 22 is spaced 180 degrees circumferentially from fissure 20 and diametrically opposite to fissure 20 .

The sleeve member 18 is also provided with a second slit 24 extending forwardly from the bore 22 to a forward end adjacent the sleeve enlarged portion 12 of the bolt member 2 .

The sleeve member is provided with a retention device 26 for frictionally engaging the wall of the hole in which the anchor bolt device is installed, and in the preferred embodiment, the device 26 is driven into the sleeve member and externally It includes a pointed body 28 that protrudes from.

The pointed body 28 projects outwardly to a point away from the axis of the bolt member 2 by a distance greater than the radius of the heel, so that the pointed head extends beyond the maximum outer periphery of the bolt member 2 as shown in FIG. It stands out beyond.

The pointed body 28 has a hole 22 perpendicular to the axis of the sleeve member 18.
are spaced around the sleeve member 18 such that its center lies in the same plane as the sleeve member 18.

In other words, the point 28 is spaced the same distance from the end of the sleeve member 18 as the hole 22.

In the illustrated embodiment, two points 28 are provided, but depending on the dimensions of the anchor bolt arrangement, more than two points may be provided if the sleeve member has a sufficiently large diameter. .

The sleeve member 18 is designed so that the crack 20 is as narrow as technically possible and the outer diameter excluding the pointed body is equal to or slightly smaller than the threaded outer diameter of the bolt member 2. It is formed around a truncated cylindrical portion 10.

To use the anchor bolt system, a hole 30 is first drilled in a concrete or masonry structure 32 using suitable equipment.

The diameter of the hole 30 is substantially equal to the outer thread diameter of the bolt member 2 so that the bolt member is press fit.

The bolt member 2 is then pushed into the hole 30 to the desired depth with a portion of the threaded portion 4 protruding as shown in FIG.

The chamfer 6 prevents the threaded opening of the screw 8 from being damaged when force is applied to the end of the bolt member to force the bolt member 2 into the hole 30.

The diameter difference between the undercut cylindrical part 10 and the cylindrical part 9 forms a shoulder 31 onto which the sleeve member 1 is attached.
8 are pressed against each other, so that the inner sleeve member cannot ride on the cylindrical portion 9 during attachment of the bolt member.

A washer member 34 is mounted over the protruding end of the threaded section and a suitable nut 36 is threaded onto the washer member, and as the nut 36 is tightened, the sleeve member 18 is expanded and the anchor bolt arrangement is installed.

The point 28 frictionally engages the wall of the hole 30 so that the nut 3
When the bolt member is pulled out of the hole 30 by tightening 6, the sleeve member 18 remains stationary.

Tightening the nut 36 draws the sleeve expansion portion 12 into the sleeve member 18, forcing the front end of the sleeve member apart and into the wall of the hole 30 as shown in FIGS.

A connecting portion 38 formed of metal between the hole 22 and the rear end of the sleeve member 18 acts as a hinge that separates the front end of the sleeve member 18 to the same extent at both apertures 20.24.

Therefore, the biting force of the sleeve member 18 is reliably uniform over the entire circumference, and as a result of equal separation of the sleeve members, a force for holding debris etc. is obtained.

The holes 22 enhance this hinge action.

By making the crack as narrow as possible and by positioning the front end of the sleeve member against the sleeve enlargement 12, as soon as the bolt member is withdrawn, the sleeve member 18 forms a wedging action with the hole into which it is inserted. It begins to expand as if waking up.

The wedging effect on the hole thus occurs evenly over almost 360° around the anchor bolt arrangement.

The extension 16 of the sleeve expansion portion 12 increases the surface area of the bolt member that engages the inside of the sleeve member during installation of the anchor bolt device.

As a result, the contact area between the sleeve expansion portion 12 of the bolt member and the sleeve member 18 increases and the anchor bolt device installation increases the resistance to the bolt member 2 being pulled out of the inner sleeve member 18.

[Brief explanation of the drawing]

Figure 1 is a side view of the bolt member of the present invention, and Figure 2 is a perspective view of the expandable sleeve member of the anchor bolt device of the present invention when installed around the bolt member shown in Figure 1. 3 is the same as FIG. 2, but the sleeve member is rotated 180 degrees around the axis from the position shown in FIG. 5 is a partially cutaway side view of the anchor bolt device positioned within the hole provided in the structure of the structure and before the sleeve member is expanded. FIG. 5 is the same as FIG. 4, but with the sleeve member expanded and the bolt FIG. 6 is a side view of the opposite side of the anchor bolt device shown in the fifth embodiment. 2... Bolt member, 8... Screw part,
10...Cylindrical part that has been cut down, 12...
... Sleeve expansion part, 14... Gradient part, 1
6...Extension part, 18...Sleeve member, 20.24...Crack, 22...
Hole, 28... point, 31... shoulder,
32...Concrete or stone structure, 36
...Natsuto, 38...Connection part.

Claims (1)

[Scope of utility model registration request] An anchor bolt device comprising: an elongated cylindrical bolt member having a portion at one end that pushes the sleeve member apart; and the sleeve member attached to the bolt member and capable of pushing the sleeve member apart, the bolt member having at least a cylindrical portion of maximum diameter that is partially threaded; and a truncated cylindrical portion between the cylindrical portion of maximum diameter and a portion that pushes the sleeve member apart; The diameter of the rounded cylindrical portion is greater than or equal to the minimum diameter of the threaded portion of the largest diameter cylindrical portion, and the portion that pushes the snob member apart has a diameter greater than or equal to the diameter of the threaded portion of the largest diameter cylindrical portion. the expandable sleeve member is mounted around the undercut cylindrical portion, the expandable sleeve member having a tapered portion increasing from the diameter of the section to the diameter of the maximum diameter cylindrical portion; The expandable sleeve member is integrally formed with a longitudinal split extending from one end thereof to the other end of the sleeve member distal to the cylindrical portion of the largest diameter. a hole formed in the sleeve member at a location adjacent to the end of the sleeve member and 180° circumferentially from the split; and a cylindrical portion of maximum diameter extending from the hole. a crack in the sleeve member extending to an end of the sleeve member distal to the end of the sleeve member such that the sleeve member is held stationary relative to the bolt member when the bolt member is moved axially; an engagement device provided on the snob member for engaging a wall of a hole into which the anchor bolt device is inserted.