RU2278776C1 - Pneumatic hammer provided with shock absorbing device - Google Patents

Abstract

FIELD: building equipment.

SUBSTANCE: pneumatic hammer includes handle, jacket, housing mounted in jacket, air shock absorbing chamber and shock absorbing spring. Sleeve is arranged between handle and jacket; air supply branch pipe is mounted in said sleeve with possibility of motion. Air shock absorbing chamber is formed by means of handle and sleeve. Shock absorbing spring is mounted between beads formed on housing and on jacket.

EFFECT: improved shock absorbing properties of hammer.

3 cl, 2 dwg

Description

The invention relates to pneumatic hammers with a shock-absorbing device and is intended for chipping and stripping of castings, riveting and other works.

A pneumatic hammer with a shock-absorbing device comprises a handle and a casing, a housing installed in the casing with an air supply pipe with the possibility of axial movement, a shock spring. A sleeve is placed between the handle and the casing, which forms an air cushioning chamber with the handle, which includes an air supply pipe of the housing slidingly mounted in the sleeve, and a damping spring is installed on the hammer casing in the casing between the shoulders made respectively on the casing and the casing.

A cavity is made in the hammer sleeve, into which a ring with a sealing collar (rubber) is placed, and the body pipe slidably enters this ring.

The technical result is an improvement in the depreciation properties of the hammer, an increase in the efficiency of vibration damping.

The invention relates to pneumatic hammers with a shock-absorbing device and can be used in mining, construction, foundry, shipbuilding and other sectors of the economy.

Known pneumatic hammer with a handle isolated from vibration according to the patent of the Russian Federation No. 2028926, class. B 25 D 17/24, 1989, comprising a housing and a handle telescopically connected to form an air chamber, a pneumatic impact mechanism located in a housing in which a channel for supplying compressed air is made in the handle, a start valve is installed in the channel, and the outer part of the housing is fixed limiter of axial axial movements of the handle relative to the housing in the form of a clamp.

A disadvantage of the known device is the complexity and unreliability in operation due to the presence of a limiter of longitudinal axial movements, reduced damping properties, insufficient vibration damping, when the hammer is put into operation, impacts of the working hammer through the limiter of longitudinal movements against the handle occur. The operator has to overcome a significant (large) force of pressing the handle, while the handle and the body occupy some neutral position through the air cushioning chamber.

Closest to the invention in technical essence to the achieved technical result is a pneumatic hammer with a shock-absorbing device according to as 289897 cells B 25 D 9/14, 1969, taken as a prototype, comprising a barrel and a handle movable along it in the axial direction, which form an air cushioning chamber, constantly filled with compressed air, in which the mating surfaces of the handle and barrel are provided with conical sockets.

The disadvantage of this pneumatic hammer with a cushioning device is: reduced cushioning properties: the barrel is not in some neutral position relative to the handle, there are no opposing forces to balance the barrel in the air cushioning chamber, so the vibrations of the working hammer are transmitted to the handle. At the moment the hammer is put into operation, the operator has to exert considerable pressure on the handle, overcoming the resistance of the spring force and the force acting on the barrel in the air spring chamber, both of which are directed in the same direction.

The technical result of the invention is improving the efficiency of vibration damping, improving the depreciation properties of the hammer.

The technical result is achieved in that a pneumatic hammer with a shock-absorbing device, comprising a handle and a casing, a housing mounted in the casing with an air supply pipe with the possibility of axial movement, a shock spring, in which a sleeve is placed between the handle and the casing, forming an air cushion chamber with the handle, into which the air inlet pipe of the housing is included, slidably mounted in the sleeve, and a damping spring is installed on the hammer housing in the casing between the shoulders, made respectively on the housing and the casing.

A cavity is made in the hammer sleeve, into which a ring is placed with a sealing collar mounted on it, and the body pipe slidably enters this ring.

The presence of these distinctive features determines the conformity of the proposed technical solution to the criterion of "novelty."

The invention is illustrated by drawings, where figure 1 schematically shows a pneumatic hammer with a shock-absorbing device, a longitudinal section; figure 2 - hammer with a ring and a sealing collar.

A pneumatic hammer with a cushioning device comprises a handle 1 and a casing 2 mounted in the casing 2 of the casing 3 with an air supply pipe 4 and a collar 5 with axial movement, a shock spring 6 mounted on the casing 3 in the casing 2 between the collar 5 of the casing 3 and the collar 7, made on the casing 2. Between the handle 1 and the casing 2 there is a sleeve 8, forming with the handle 1 an air cushioning chamber 9, which includes an air supply pipe 4, slidably mounted in the sleeve 8.

In the sleeve 8, a cavity 10 is made in which a ring 11 with an external sealing sleeve 12 is placed, and a pipe 4 of the housing 3 is slidably mounted in the ring 11.

A pneumatic hammer with a shock-absorbing device operates as follows.

When the hammer is turned on, compressed air fills the air cushioning chamber 9, under the action of compressed air on the cross-sectional area of the pipe 4, the housing 3 will move downward, acting with a shoulder 5 on the cushioning spring 6, and will take some neutral position in the casing 2, at a time when acting on the housing 3 above and below, will be balanced. Further, from the air cushioning chamber 9 through the channel 13 of the pipe 4, compressed air enters the air distribution mechanism 14, which provides reciprocating movement of the striker 15 in the housing 3. In this case, the vibrations of the housing 3 near the neutral position relative to the handle 1 with the casing 2 are not transmitted to the operator’s hands .

Claims (3)

1. A pneumatic hammer with a cushioning device, comprising a handle, a casing, a casing installed in the casing, an air cushioning chamber and a cushioning spring, characterized in that a sleeve is placed between the casing and the casing, in which an air supply pipe is mounted to move, an air cushioning chamber is formed a handle and a sleeve, and a damping spring is installed between the shoulders made on the body and casing. 2. The pneumatic hammer according to claim 1, characterized in that the sleeve has a cavity in which a ring with a sealing sleeve is placed, while the air inlet pipe is placed in the ring. 3. The pneumatic hammer according to claim 2, characterized in that the sealing lip of the ring is made of rubber.

Images