Hammer Structure

Abstract

A hammer structure includes a hammer body, at least one hitting block, a compression spring, and a shaft. The hammer body has a radial through hole. The hitting block includes a mounting portion having an accommodating hole. The compression spring is accommodated in the accommodating hole. The shaft is inserted through the compression spring so that it can be elastically extended and retracted via the compression spring. The mounting portion of the hitting block is screwed to the end of the hammer body. The shaft counteracts an elastic force of the compression spring to be partially engaged in the radial through hole. The hammer structure can prevent the hitting block screwed to a mounting groove of the hammer body from being loosened due to strong impact and vibration in the hitting process, so as to fix the hitting block and avoid damage effectively.

Claims

1. A hammer structure, comprising a hammer body, at least one hitting block, a compression spring, and a shaft; at least one end of the hammer body being recessed to form a mounting groove, an annular end face being formed between the end of the hammer body and an opening of the mounting groove, the hammer body having a radial through hole communicating with the mounting groove, the radial through hole having a large-diameter hole section at an inner end thereof and a small-diameter hole section at an outer end thereof; the hitting block having a hitting portion and a mounting portion protruding from one end of the hitting portion, the mounting portion having an outer diameter less than that of the hitting portion, a stop edge being formed between the end of the hitting portion and the mounting portion, the mounting portion having an accommodating hole transversely passing through the mounting portion, the accommodating hole including an engaging hole, a reduced hole and a positioning hole in sequence; the reduced hole being located inside the accommodating hole, the engaging hole being located at one end of the reduced hole and extending to an outer peripheral surface of the mounting portion, the positioning hole being located at another end of the reduced hole and extending to the outer peripheral surface of the mounting portion; the compression spring being accommodated in the engaging hole, one end of the compression spring abutting against the reduced hole; the shaft having a small-diameter shaft section, a large-diameter shaft section and a stop face between the small-diameter shaft section and the large-diameter shaft section, the shaft being inserted into the accommodating hole, the small-diameter shaft section of the shaft passing through the compression spring, the stop face pressing against another end of the compression spring; the shaft counteracting an elastic force of the compression spring for a distal end of the small-diameter shaft section to pass through the reduced hole and extend into the positioning hole, the large-diameter shaft section being in the engaging hole, a C-shaped retaining ring being provided to fasten the distal end of the small-diameter shaft section, the C-shaped retaining ring being blocked by the reduced hole to prevent the small-diameter shaft section from coming out of the positioning hole, wherein when the large-diameter shaft section is pressed into the accommodating hole, the external thread segment of the mounting portion is screwed to the internal thread segment of the mounting groove, so that the stop edge abuts against the annular end face of the mounting groove, and the large-diameter shaft section is pushed by the compression spring to extend out of the outer peripheral surface of the mounting portion to be engaged in the large-diameter hole section of the radial through hole.

2. The hammer structure as claimed in claim 1, wherein the small-diameter hole section has a diameter less than that of the large-diameter shaft section.

3. The hammer structure as claimed in claim 1, wherein the mounting groove has an internal thread segment on an inner peripheral surface thereof, the mounting portion has an external thread segment on an outer peripheral surface thereof, and the external thread segment of the mounting portion is screwed to the internal thread segment of the mounting groove.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG. 1 is a perspective view of the prior art;

[0010] FIG. 2 is a front cross-sectional view of the prior art;

[0011] FIG. 3 is an exploded view of the present invention;

[0012] FIG. 4 is a front cross-sectional of the present invention; and

[0013] FIG. 5 is a side cross-sectional of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0014] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.

[0015] Referring to FIGS. 3 to 5, the present invention comprises a hammer body 20, at least one hitting block 25, a compression spring 31, and a shaft 32.

[0016] At least one end of the hammer body 20 is recessed to form a mounting groove 21. The mounting groove 21 has an internal thread segment 22 on an inner peripheral surface thereof. An annular end face 23 is formed between the end of the hammer body 20 and an opening of the mounting groove 21. The hammer body 20 has a radial through hole 24 communicating with the mounting groove 21. The radial through hole 24 has a large-diameter hole section 241 at an inner end thereof and a small-diameter hole section 242 at an outer end thereof. The hitting block 25 has a hitting portion 26 and a mounting portion 27 protruding from one end of the hitting portion 26. The mounting portion 27 has an outer diameter less than that of the hitting portion 26, so that a stop edge 28 is formed between the end of the hitting portion 26 and the mounting portion 27. The mounting portion 27 has an external thread segment 29 on an outer peripheral surface thereof and an accommodating hole 30 transversely passing through the mounting portion 27. The accommodating hole includes an engaging hole 302, a reduced hole 301, and a positioning hole 303 in sequence. The reduced hole 301 is located inside the accommodating hole 30. The engaging hole 302 is located at one end of the reduced hole 301 and extends to the outer peripheral surface of the mounting portion 27. The positioning hole 303 is located at another end of the reduced hole 301 and extends to the outer peripheral surface of the mounting portion 27. The compression spring 31 is accommodated in the engaging hole 302. One end of the compression spring 31 abuts against the reduced hole 301. The shaft 32 has a small-diameter shaft section 321, a large-diameter shaft section 322, and a stop face 323 between the small-diameter shaft section 321 and the large-diameter shaft section 322. The shaft 32 is inserted into the accommodating hole 30, and the small-diameter shaft section 321 of the shaft 32 passes through the compression spring 31, so that the stop face 323 presses against the other end of the compression spring 31. An external force is applied to the shaft 32 against the elastic force of the compression spring 31 for the distal end of the small-diameter shaft section 321 to pass through the reduced hole 301 and extend into the positioning hole 303. The large-diameter shaft section 322 is in the engaging hole 302, and a C-shaped retaining ring 324 is configured to fasten the distal end of the small-diameter shaft section 321. The C-shaped retaining ring 324 is blocked by the reduced hole 301 to prevent the small-diameter shaft section 321 from coming out of the accommodating hole 30. When the large-diameter shaft section 322 is pressed into the accommodating hole 30, the external thread segment 29 of the mounting portion 27 is screwed to the internal thread segment 22 of the mounting groove 21, so that the stop edge 28 abuts against the annular end face 23 of the mounting groove 21. At this time, the large-diameter shaft section 322 is pushed by the compression spring 31 to extend out of the outer peripheral surface of the mounting portion 27 and to be engaged in the large-diameter hole section 241 of the radial through hole 24. The above structure can prevent the hitting block 25 screwed to the mounting groove 21 from being loosened due to strong impact and vibration in the hitting process, so as to fix the hitting block 25 and avoid damage effectively.

[0017] The assembly, function and effect of the above-mentioned embodiment are described in detail below. Referring to FIGS. 3 to 5, when the hitting block 25 of the present invention is to be assembled, a force is applied to the large-diameter shaft section 322 of the shaft 32 extending out of the outer peripheral surface of the mounting portion 27. The stop face 323 of the shaft 32 compresses the compression spring 31, so that the large-diameter shaft section 322 is moved into the engaging hole 302. At this time, the shaft 32 is in the accommodating hole 30 and won't hinder the hitting block 25 from being screwed to the mounting groove 21. When the hitting block 25 is rotated until the stop edge 28 abuts against the annular end face 23 of the mounting groove 21, the accommodating hole 30 is just aligned with the radial through hole 24. The shaft 32 is pushed by the compression spring 31, so that the large-diameter shaft section 322 of the shaft 32 is moved in the large-diameter hole section 241 of the radial through hole 24. The diameter of the small-diameter hole section 242 of the radial through hole 24 is less than the diameter of the large-diameter shaft section 322 of the shaft 32, which can prevent the shaft 32 from coming out of the radial through hole 24. At this time, the shaft 32 is positioned between the radial through hole 24 and the accommodating hole 30. In this way, the hitting block 25 cannot be rotated relative to the hammer body 20. In other words, the hitting block 25 won't be disengaged from the mounting groove 21, which can avoid the problem that the mating surfaces of the internal thread segment 22 and the external thread segment 29 are directly damaged by the hitting force. As shown in FIG. 5, when the hitting block 25 needs to be replaced, a rod tool 33 is used to pass through the small-diameter hole section 242 of the radial through hole 24 and exert a force on the large-diameter shaft section 322 of the shaft 32 to compress the compression spring 31. The large-diameter shaft section 322 of the shaft 32 is moved away from the large-diameter hole section 241 of the radial through hole 24 to be in the engaging hole 302 of the accommodating hole 30, so that the hitting block 25 can be rotated reversely to disengage from the mounting groove 21 for replacement.

[0018] Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.