CN2799955Y

CN2799955Y - Adjustable strong expansion bolt

Info

Publication number: CN2799955Y
Application number: CN 200520034399
Authority: CN
Inventors: 牛强
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-06-06
Filing date: 2005-06-06
Publication date: 2006-07-26
Anticipated expiration: 2015-06-06

Abstract

The utility model discloses an adjustable strong expanding bolt. The utility model comprises the bolt, an expanding sleeve, a flat washer, a spring washer and nuts, wherein the expanding sleeve is provided with a plurality of expanding pieces with inner wrap hems and guiding tongues; a connecting position of a taper expanding head and a cylindrical section of the bolt is provided with a plurality of extruding grooves which are matched with the expanding pieces, each extruding groove respectively passes through guiding chutes which are positioned at the front and the back of the extruding groove along an axial direction and are matched with the guiding tongues, and each extruding groove is connected with the cylindrical surface of the bolt and the conical surface of the expanding head. The utility model can obtain large expanding capacity for firmly fastening objects under the condition of short strokes.

Description

Adjustable strong expansion bolt

Technical field

The utility model relates to a kind of EXPANSION ANCHOR BOLTS.

Background technique

At present, the less shortcoming of swell increment that widely used various EXPANSION ANCHOR BOLTS ubiquities have expansion sleeve can't be with bolt swelling effectively, cause bolt when locking, easily to rotate with nut, easily loosening when being subjected to external force, make the stretching resistance of bolt not enough, when mounted easily landing.

The model utility content

The swell increment that the purpose of this utility model provides a kind of expansion sleeve is big, the EXPANSION ANCHOR BOLTS of fastening object securely.

For achieving the above object, adjustable strong expansion bolt of the present utility model comprises bolt, expansion sleeve, plain washer, spring washer and nut, be provided with several notches in the bottom of described expansion sleeve, it is divided into several intumescent sheets, each intumescent sheet is the circular arc (top of intumescent sheet is the bottom of expansion sleeve) of evagination, and its top is provided with the crimping of inwardly wrapping up in, be provided with triangle guiding tongue at the root of each intumescent sheet to the expansion sleeve inner bending, the diameter of the annulus that the tip of the tongue of its several guiding tongue is formed and the diameter of bolt are complementary, and the diameter of comparable bolt is smaller; Be provided with several extruding grooves that are complementary with intumescent sheet at the tapered expansion head of described bolt and the joint of cylindrical section, during use, the crimping of each intumescent sheet places in the corresponding extruding groove, the radius of arc of extruding bottom portion of groove is greater than the radius of arc of the crimping of intumescent sheet, and each extruding groove is by being positioned at its place ahead, vertically and linking to each other with the periphery of bolt with guiding skewed slot that the guiding tongue is complementary.

Working procedure of the present utility model is: in boring good cinclides with expansion sleeve, plain washer, spring washer and nut are assembled on the bolt according to this, this moment, the crimping of each intumescent sheet placed in the corresponding extruding groove, each guiding tongue is aimed at corresponding guiding skewed slot (but not placing in the guiding skewed slot), by fastening nut constantly, the extruding groove is earlier with the inside constantly winding up of the crimping of intumescent sheet, the diameter of crimping is constantly increased, intumescent sheet shortens, up to contacting with the guiding tongue, the tonguing of leading this moment is gone into to push the preceding guiding skewed slot of groove and is touched with the bottom connection that increases the back crimping, continue fastening nut, the guiding tongue plays chock, crimping is outwards squeezed, intumescent sheet is outwards expanded, can obtain to be several times as much as the swell increment of expansion sleeve wall thickness;

As further improvement of the utility model, described extruding groove is also by being positioned at its rear, vertically and linking to each other with the expansion-head conical surface with the guiding skewed slot that is complementary of guiding tongue, when the guiding tongue has entered the extruding groove, continue fastening nut, the guiding tongue progresses into the guiding skewed slot on the tapered expansion head, and upwards creep along skewed slot, make intumescent sheet continue outwards to expand, the swell increment of this moment is the diameter that the difference of tapered expansion head and bolt radius adds crimping, and the swell increment that therefore can strengthen expansion sleeve is big.

Advantage of the present utility model is: under the condition of nut short stroke, obtain big swell increment, and can fastening securely object.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment expansion sleeve.

Fig. 2 is the distribution schematic diagram of the utility model embodiment intumescent sheet.

Fig. 3 is the structural representation of the utility model bolt.

Fig. 4 is the sectional view of the initial working state of the utility model.

Fig. 5 is the sectional view of the utility model expansion working state.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

Adjustable strong expansion bolt of the present utility model comprises bolt 1, expansion sleeve 2, plain washer, spring washer and nut 3, by illustrated in figures 1 and 2, the bottom of expansion sleeve 2 is provided with six notches, it is divided into six intumescent sheets 4, each intumescent sheet 4 is the circular arc (top of intumescent sheet is the bottom of expansion sleeve) of evagination, and its top is provided with the crimping of inwardly wrapping up in 5, be provided with triangle guiding tongue 6 at the root of each intumescent sheet 4 to expansion sleeve 2 inner bendings, the diameter of the annulus that the tip of the tongue of its six guiding tongues 6 is formed is more smaller than the diameter of bolt, the tongue 6 of being convenient to lead enters the guiding skewed slot on the bolt 1, by shown in Figure 3, the tapered expansion of bolt 17 is provided with six extruding grooves 8 that are complementary with intumescent sheet crimping 5 with the joint of cylindrical section, the radius of arc of extruding groove 8 bottoms is greater than the radius of arc of intumescent sheet crimping 5, crimping 5 inside winding ups when being convenient to push, each extruding groove 8 is respectively by being positioned at its forward-and-rearward, vertically, and with the guiding skewed slot 9 that is complementary of guiding

tongue

6,10 link to each other with the periphery of bolt and the conical surface of expansion-head 7.

By shown in Figure 4, do not produce the initial working state that expands as yet, each intumescent sheet crimping 5 places in the corresponding extruding groove 8, guiding tongue 6 is close to the periphery of bolt, along with fastening nut 3 constantly, as shown in Figure 5, intumescent sheet crimping 5 is inside winding up constantly, the diameter of crimping 5 is constantly increased, intumescent sheet 4 shortens, and the guiding tongue is creeped along forward and backward guiding

skewed slot

9,10, and crimping 5 is outwards squeezed, intumescent sheet 4 is outwards expanded, reach the maximum swelling amount at the end of the conical surface of expansion-head 7.

Claims

1. adjustable strong expansion bolt, comprise bolt, expansion sleeve, plain washer, spring washer and nut, the bottom that it is characterized in that described expansion sleeve is provided with several notches, it is divided into several intumescent sheets, each intumescent sheet is the circular arc of evagination, and its top is provided with the crimping of inwardly wrapping up in, and is provided with triangle guiding tongue to the expansion sleeve inner bending at the root of each intumescent sheet, and the diameter of the annulus that the tip of the tongue of its several guiding tongue is formed and the diameter of bolt are complementary; Be provided with several extruding grooves that are complementary with intumescent sheet at the tapered expansion head of described bolt and the joint of cylindrical section, the radius of arc of extruding bottom portion of groove is greater than the radius of arc of the crimping of intumescent sheet, and each extruding groove is by being positioned at its place ahead, vertically and linking to each other with the periphery of bolt with guiding skewed slot that the guiding tongue is complementary.

2. adjustable strong expansion bolt according to claim 1 is characterized in that described extruding groove is also by being positioned at its rear, vertically and linking to each other with the expansion-head conical surface with the guiding skewed slot that is complementary of guiding tongue.