Abrégé

Disclosed is a nut loosening prevention device for preventing loosening of a nut coupled to a screw thread formed on the outer circumferential surface of a bolt body. The nut loosening prevention device, according to the present invention, comprises: a spring rotating along the screw thread of the bolt body; a cap member for covering the nut and the spring; and a plate spring which has an insertion hole, and of which a plate surface is curved. Here, the spring comprises: a free end which is formed on one end portion thereof and is configured to have a diameter greater than the diameter of the screw thread of the bolt body, and which comes into contact with one surface of the nut when being installed; and a fixed end which is formed on the other end portion thereof and is curved outwardly. The cap member comprises: an aperture which is formed, by cutting one side of the outer surface thereof, on a side other than a portion into which the nut and the spring are inserted; and a mounting groove which is recessed from the aperture by a predetermined depth.

Classes IPC  ?

• F16B 39/38 - Blocage des vis, boulons ou écrous dans lequel le verrouillage se fait en même temps que le vissage ou le serrage par organes particuliers portés par l'écrou ou le boulon ou par la forme particulière de ceux-ci avec une seconde partie du filetage qui peut être montée élastiquement
• F16B 39/32 - Blocage par cliquet ou languette genre cliquet
• F16B 37/14 - Écrous-chapeauxChapeaux d'écrous ou de boulons

Abrégé

Disclosed is a muffler having a noise reduction structure using a spiral steel pipe. The present invention comprises: an outer shell having a hollow formed therein and having open both ends; an inner shell mounted inside the outer shell to correspond longitudinally to the outer shell; a sound absorbing material surrounding the inner shell and filled in the outer shell; a pair of closing caps coupled to the both ends of the outer shell; and a spiral blade of a spiral structure having pitches at equal intervals. Here, the inner shell, which has a pipe shape in which both ends thereof are opened and a plurality of through holes being perforated and formed along the outer circumferential surface thereof, is a spiral steel pipe formed in a spiral shape while fixing an overlapping portion of a band steel to form a fixture portion, wherein a spiral groove is formed to be repeated at the same pitch as the fixture portion, and wherein a spiral end portion of the spiral blade is threaded into the spiral groove to be mounted and fixed inside the inner shell.

Classes IPC  ?

• F01N 1/12 - Silencieux caractérisés par leur principe de fonctionnement réduisant l'énergie des gaz évacués par étranglement ou tourbillon utilisant des canalisations en spirale ou en hélice
• F01N 1/10 - Silencieux caractérisés par leur principe de fonctionnement réduisant l'énergie des gaz évacués par étranglement ou tourbillon en combinaison avec des matériaux absorbant le son
• F01N 1/08 - Silencieux caractérisés par leur principe de fonctionnement réduisant l'énergie des gaz évacués par étranglement ou tourbillon

Abrégé

Disclosed is a double nut including a loosening prevention member. The double nut including the loosening prevention member according to the present invention includes: a double nut part including a lower nut that is fastened to the lower portion of the protruding area of a bolt inserted, so as to protrude, into fastening holes formed in fastening target objects which are to be fastened to each other, and an upper nut that is fastened to the upper portion of the protruding area; and a loosening prevention member disposed between the lower nut and the upper nut to apply elasticity in a direction in which the lower nut and the upper nut move away from each other. Here, by forming guide grooves, which are formed gradually recessing in a circumferential direction in the top surface of the lower nut and the bottom surface of the upper nut, respectively, so as to be symmetrical to each other, and catching grooves, which form boundary surfaces on both ends of the guide grooves, to support both ends of the loosening prevention member, the upper nut is configured to be rotatable only in the direction in which the upper nut moves toward the lower nut.

Classes IPC  ?

• F16B 39/02 - Blocage des vis, boulons ou écrous dans lequel le verrouillage s'effectue après vissage

Abrégé

Disclosed is a bolt structure having a locking device built in. A bolt structure having a locking device built in according to the present invention is provided with: a base bolt, one end of which is inserted into a hole that is formed by overlapping a fixing structure and an object to be fixed; a core bolt which is screw-fastened so as to be capable of moving back and forth through the center along the longitudinal direction of the base bolt; a nut which is fastened to an end of the base bolt inserted into and protruding from the hole, and is thereby fastened to the base bolt so that the state in which the fixing structure and the object to be fixed overlap is maintained; a locking member which selectively presses the outer surface of the nut according to the back-and-forth movement of the core bolt, thereby preventing the separation of the base bolt; and a restriction part which is screw-fastened so as to be capable of moving back-and-forth through the center along the longitudinal direction of the base bolt while facing the core bolt, and is in contact with the end of the core bolt to restrict the back-and-forth movement of same.

Classes IPC  ?

• F16B 39/28 - Blocage des vis, boulons ou écrous dans lequel le verrouillage se fait en même temps que le vissage ou le serrage par organes particuliers portés par l'écrou ou le boulon ou par la forme particulière de ceux-ci
• F16B 35/04 - Boulons filetésBoulons d'ancrageGoujons filetésVisVis de pression avec tête ou axe de forme particulière permettant de fixer le boulon sur ou dans un objet

Abrégé

The present invention relates to a fixing means (a set of bolts). More particularly, the present invention relates to a fixing means having a physical property and structure configured such that a locking unit is expandably transformed or displaced by tightening a core bolt penetrating through a base bolt, thereby pressing a fixing portion. When vibrations such as earthquakes occur, the fixing means itself or wall attachments fixed onto interior walls by means of the fixing means, including pieces of furniture and lighting fixtures, are prevented from being separated from a fixing portion, and can be dismantled without destruction as pressure can be adjusted by expansion and contraction. The fixing means can be used in environments which permit work on only one side or structures which permit work on only one side, for example interior walls and ceiling fixtures such as upper kitchen cabinets, wall-mountable TVs, wall-mountable air conditioners, kitchen lighting, rail lighting, projectors, etc., and exterior fixtures such as signboards, lighting fixtures, etc.

Classes IPC  ?

• F16B 13/06 - Chevilles ou autres dispositifs fixés à des parois ou autres emplacements par insertion dans des trous préparés à cet effet avec parties s'agrippant dans le trou ou derrière la paroi après insertion et combinées avec un manchon extensible
• F16B 39/02 - Blocage des vis, boulons ou écrous dans lequel le verrouillage s'effectue après vissage