RU2578299C2 - Vibration protected handle of chisel hammer - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to the vibration protected handle of the chisel hammer. The vibration protected handle of the chisel hammer contains a casing, elastic element, centraliser and handle connected with links with possibility of their movement relatively to the casing. The links are connected with the elastic element such, that it is at right angle to the axis of symmetry of the vibration protected handle. To the links the contact elements in form of rollers are connected, the rollers rest on the parabolic guides connected with the casing. The guides are made with possibility of the said rollers sliding over them. The centraliser is connected with the handle and casing with possibility of its movement along axis of symmetry of the vibration protected handle.

EFFECT: increased vibration protection of the handle.

1 dwg

Description

The invention relates to vibration protection systems and may find application in personal protective equipment for operators from vibration.

Known personal protective equipment against vibration (1) USSR No. 1475573 1989, (2) A.S. USSR No. 961646 1982, when working with hand tools of high specific power. The disadvantage of these solutions is the small resource of the device.

Known pneumatic jackhammer (3) PM No. 101083 from 01/10/2011, containing a handle and the middle part of the barrel, which is coated with a vibration protection coating, and a damping ring is installed between the handle and the intermediate link to reduce the vibration load on the operator.

The disadvantage of this technical solution is the lack of vibration reduction.

Known vibration-proof handle of a pneumatic jackhammer (4) (PM Alabuzhev A.A., Gritchin II, edited by K.M. Ragulskis. - L .: Engineering, 1986 - P.87), which contains a vibration-proof system with quasi-zero stiffness consisting of a bearing elastic element and elastic elements of the stiffener corrector in the form of elastic longitudinally compressed rods. This technical solution is a prototype.

The disadvantage of this solution is the low reliability associated with the instability of longitudinally compressed rod systems and significant vibration.

The technical task of this invention is to reduce vibration and increase the reliability of the device.

The problem is solved by a design that provides a power characteristic with quasi-zero stiffness consisting of a handle, an elastic element, parabolic guides and a centralizer.

The handle (1) is connected to the links (2) with the possibility of their movement relative to the body (6), and the links (2) are connected to the elastic element (3) so that the latter is perpendicular to the axis of symmetry of the structure. The contact elements (4) (rollers) are attached to the links (2), which are supported by parabolic-shaped guides (5) connected to the housing (6) and the contact elements (4) can slide along them. The centralizer (7) is connected to the handle (1) and the body with the possibility of its movement along the axis of symmetry of the structure.

Figure 1 shows the design of the vibration-proof handle of a jackhammer, consisting of:

- handles 1

- link 2

- elastic elements 3

- contact elements 4 (rollers)

- guides of parabolic shape 5

- housing 6.

Work of the vibration-proof handle of a jackhammer

When the body 6 moves upward, the guides of the parabolic shape 5 move, the contact elements 4 begin to move along the surfaces of the guides 5, moving from the narrower part to the wider, while causing the elastic element 3 to stretch. The elastic force of the elastic element 3 increases, while increasing the reaction force acting on the contact elements 4. An increase in this force is compensated by a decrease in the angle of inclination of the guides 5. Thus, the pushing force of the contact elements 4 in the axial direction is almost not changes therefore the force acting on the handle 1 remains nearly unchanged, and therefore does not move at the same pressure force generated by a human operator. When the body of the jackhammer 6 moves down, the device works similarly. So, despite the fluctuations in the body of the jackhammer 6, the oscillations of the handle 1 does not occur. Thus, a highly effective vibration protection of the human operator is achieved.

The technical result is a significant reduction in vibration transmitted to the human operator.

This invention passed the test according to the methodology in JSC "Remservice" in the IV quarter. 2012 year

Information sources

1. RU Patent No. 101083 dated January 10, 2011

2. A.S. USSR No. 1475573, 1989

3. A.S. USSR No. 961646, 1982

4. PM Alabuzhev A. A., Gritchin I.I. edited by K.M. Ragulskis. - L. Mechanical Engineering, 1986. - P.87 (prototype).

Claims (1)

A vibroprotective handle of a jackhammer comprising a housing and an elastic element, characterized in that it is provided with a centralizer and a handle connected to the links with the possibility of their movement relative to the housing, which are connected to the elastic element to ensure the perpendicularity of the elastic element of the axis of symmetry of the vibrationproof handle, and attached to the links contact elements in the form of rollers, supported by parabolic-shaped guides connected to the housing, which are made to slide along them faces, and the centralizer is connected to the handle and the housing with the possibility of its movement along the axis of symmetry of the vibration-proof handle.