# US 2024/0058932 A1 · Hammer Structure

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- Number: US 2024/0058932 A1
- Document ID: US20240058932A1
- Status: Published application
- Kind: A1
- Application number: 17/891,239
- Filed: 2022-08-19
- Published: 2024-02-22
- Earliest claimed: 2022-08-19
- Assignees: Witman Corporation
- Applicants: Witman Corporation
- Inventors: Hui-Ni Lin
- Web page: https://patentgrep.com/patent/US20240058932A1

## CPC

- B25D 1/02: Inserts or attachments forming the striking part of hammer heads (B25D1/08 - B25D1/14 take precedence)
- B25D 1/14: having plural striking faces
- B25D 2250/361: Use of screws or threaded connections
- B25D 2250/371: Use of springs
- B25D: PERCUSSIVE TOOLS {(percussive machines for forging B21J; hand-held drilling machines, in general B23B45/00, for wood B27C3/08; drilling machines, used for mining or quarrying, with reciprocating tool which is turned intermittently when out of contact with the working face E21B1/00)}

## 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

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.