Pneumatic hammer with buffers

Details Pneumatic hammer with buffers Pneumatic hammer with buffers

2000-04-12

2001-02-27

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Impacting devices

With impact cushioning means

C173S162100, C173S210000

Reexamination Certificate

active

06192997

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pneumatic hammer, and more particularly to a pneumatic hammer with buffer to absorb the shock to the operator.
2. Description of Related Art
With reference to
FIG. 7.
, a conventional pneumatic hammer in accordance with the prior art comprises a housing (
60
) and a handle (
62
) extending from the housing (
60
) to connect with a high pressure air source with a high-pressure air connector (not shown). A trigger (
64
) is mounted in the handle (
62
) to control the high pressure to the housing (
60
) through an air passage (
622
) defined in the handle (
62
). Consequently, the high pressure air can be directed into the housing (
60
) through the high-pressure air connector and the air passage (
622
) as the operator squeezes the trigger (
64
). A cylinder (
70
) is screwed into the housing (
60
) and has an actuating head (
72
) slidably mounted in the cylinder (
70
). A reciprocating valve (
74
) is mounted on one end of the cylinder (
70
) to control the direction of the air flow. The air propels the actuating head (
72
) forwards and backwards inside the cylinder (
70
). The actuating head (
72
) impacts a tool shank (
66
) that hammers or cuts.
Because the cylinder (
70
) is rigidly attached to the housing (
60
), the shock caused by the actuating head (
72
) striking the tool shank (
66
) and the end of the cylinder (
70
) housing the reciprocating valve (
74
) will be directly transmitted to the housing (
60
) and handle (
62
) and subsequently to the operator. The control of the pneumatic hammer will be reduced by the shock. In addition, when the operator squeezes or otherwise depresses the trigger (
64
), the high-pressure air will flow into the cylinder (
70
) and instantaneously propel the actuating head (
72
). Thus the pneumatic hammer easily operates unintentionally when the operator playfully holds the pneumatic hammer. This could easily cause injury to the operator.
To overcome the shortcomings, the present invention tends to provide an improved pneumatic hammer to mitigate or obviate the aforementioned problems.
SUMMARY OF THE INVENTION
The main objective of the invention is to provide an improved pneumatic hammer that significantly reduces the shock transmitted to the operator. The pneumatic hammer in accordance with the present invention has a housing with a handle, a sleeve, a cylinder, an actuating head and two buffers. The handle is integrally formed on the housing. The sleeve is slidably mounted in the housing The cylinder is securely attached to the sleeve. The actuating head is slidably received in the cylinder. A buffer is mounted on and abuts each end of the sleeve. By the arrangement of the buffers, the shock caused by the actuating head will be attenuated before it is transmitted to the housing and the handle. The control of the pneumatic hammer will be improved.
The other objective of the invention is to provide an improved pneumatic hammer that has a built in delay in the operation of the hammer. The pneumatic hammer has an annular recess defined in the outer periphery of the sleeve and at least one inlet defined in the face defining the recess wherein the recess is not aligned with the air passage in the handle. The pneumatic hammer will not operate immediately when the operator squeezes or depresses the trigger until the recess in the sleeve is moved to face the air passage. This improves the safety of using and handling the pneumatic hammer.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 3894426 (1975-07-01), Kopf
patent: 5163519 (1992-11-01), Mead et al.
patent: 5170922 (1992-12-01), Ehmig et al.
patent: 5417294 (1995-05-01), Suher
patent: 5626199 (1997-05-01), Henry et al.
patent: 5873418 (1999-02-01), Arakawa et al.

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