Tool driving or impacting – Impacting devices – Hammer head comprises plural parts or diverse materials
Patent
1985-01-11
1987-06-02
Kazenske, E. R.
Tool driving or impacting
Impacting devices
Hammer head comprises plural parts or diverse materials
173133, 173134, 91229, F01L 2104, B25D 904, B25D 916
Patent
active
046695532
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a percussion tool suitable for use in breaking into pieces a working surface by a chisel point by utilizing the impacting force exerted by a hammer member on an anvil.
2. Background Art
Percussion tools have been widely utilized in the construction and manufacturing fields for such diverse applications as paving breaking, pile driving, impact hammering and casting deburring. In these applications, a percussion tool has particular utility in crushing into pieces the asphalt pavement of a road when the road is to be repaired or the wall of a building when the building is to be repaired. In these applications, a pointed forward end of a chisel or chisel point is abutted against the working surface, such as the surface of the pavement or the wall, and the hammer member mounted within a tool casing is moved in axial reciprocatory movement to impact the anvil supporting the chisel point to force the chisel point into a layer below the working surface by penetrating and braking it into pieces. In the crushing operation described hereinabove the hammer member is moved in axial reciprocatory impacting movement to exert an impact force on the anvil supporting the chisel point, and it has been usual practice to provide a special drive unit for reciprocatorily moving the hammer member within the tool casing. Thus, the percussion tools of the prior art have suffered the disadvantage that the tool itself becomes large in size due to the provision of the drive unit for driving the hammer member for reciprocatory movement.
When the aforesaid boring operation is performed, the operator has to grip a handle of the tool and hold same by hand during operation. Although the prior art percussion tools have proven generally effective to accomplish their desired function, they have possessed inherent deficiencies. Foremost of these deficiencies has been the extremely high vibration force communicated to the operator of the tool during reciprocatory movement of the hammer member within the tool casing. Such vibration has necessarily caused discomfort to the operator, making it impossible for the operator to continue the operation over a prolonged period of time by enduring the discomfort and overcoming fatique that inevitably preyed on him.
The percussion tools of the construction and operation described hereinabove are not necessarily held by the operator in performing their function. When necessary, they may be attached to a suitable working machine, such as a back-how, to perform their function. With the extremely high vibratory force generated by the hammer member which is reciprocatorily moving in the tool casing, it would become necessary to use a working machine of a larger size than the one which would normally be used.
This invention has been developed for the purpose of obviating the aforesaid disadvantages of the prior art. Accordingly, the invention has as its object the provision of a percussion tool enabling an overall compact size to the obtained in a percussion tool and capable of minimizing the vabration force generated when the hammer member moves in reciprocatory impacting moving within the tool casing.
DISCLOSURE OF THE INVENTION
The aforesaid object is accomplished according to the invention by providing the percussion tool of the aforesaid type with features including a chisel point supported by an anvil, a casing having mounted therein the chisel point supported by the anvil for axial reciprocatory movement and defining therein a bore closed at one end by an impact receiving end of the anvil opposite an end at which the chisel point is supported, a hammer member mounted within the bore for reciprocatory impacting movement into and out of contact with the impact receiving end of the anvil, a stationary partition member located on an inner peripheral surface of the casing and maintaned in intimate contact with the hammer member for partitioning the bore defined by the casing into two bore sections or a first bore section remote from the impact receiv
REFERENCES:
patent: 678759 (1901-07-01), Payton
patent: 682492 (1901-09-01), Payton
patent: 884971 (1908-04-01), Albree
patent: 1117884 (1914-11-01), Montgomery
Kazenske E. R.
Knoble John L.
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