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1. Field of the Invention
The present invention relates generally to a handheld tool, and more particularly to an innovative one which is configured with a connecting rod for the tool head.
2. Description of Related Art Including Information Disclosed Under 37 CFR 1.97 and 37 CFR 1.98
The common electric screwdrivers with adjustable assembly heads permit assembly or replacement of screwdriver heads or drill heads of different sizes. However, owing to larger external diameter, said assembly head cannot be inserted into a small gap wherein the screws are located. Hence, a connecting rod of a tool head has been developed for this purpose. As for said connecting rod of tool head, one end is generally provided with an assembly rod adapted onto the assembly head of the electric screwdriver, and the other end is extended to a preset length and provided with a tool head slot for the screwdriver heads or drill heads.
Said connecting rod of tool head is structurally configured in such a manner that an elastic release mechanism is generally set to make the screwdriver head generate a springing action for easily taking out the tool head. According to the conventional configuration of said elastic release mechanism, a control loop is arranged onto the periphery of the inserting end of the screwdriver head for the tool head connecting rod. By pushing the control loop, the locating member preset in the connecting rod of the screwdriver head can be controlled into a release state, so that the inserted tool head can spring out to a certain distance, allowing for easily taking out by the user. Yet, it is observed from actual applications that, as the control loop is arranged onto the periphery of the inserting end of the tool head connecting rod, the external diameter of the tool head connecting rod is expanded, so it cannot be inserted into small gap without expected functions and advantages.
Moreover, said control loop is operated manually by gripping and pushing with at least two fingers (generally thumb and forefinger), this makes it inconvenient and difficult to hold manually and apply a force to it.
Thus, to overcome the aforementioned problems of the prior art, it would be an advancement if the art to provide an improved structure that can significantly improve the efficacy.
Therefore, the inventor has provided the present invention of practicability after deliberate experimentation and evaluation based on years of experience in the production and development of related products.
The enhanced efficacy of the present invention is as follows:
First, based on the unique configuration of the present invention wherein the positioning and releasing state of the internal slider of the tool head connecting rod is realized by said control bead, and the control bead is protruded into the space of said lateral recess, the present invention allows for elimination of the exposed control loop of prior art. The tool head connecting rod of much lower diameter can be inserted into small gap, thus improving the efficacy and flexibility.
Second, the control bead can be operated in a way to release easily the internal slider by means of single finger pressing. Said control bead can be positioned in a way to pass through the radial through-hole by insertion and pushing of the tool head, so the positioning and releasing state of the internal slider and tool head can be switched more easily and conveniently with better applicability.
Third, the tool head connecting rod of the present invention only comprises a hollow rod, internal slider, magnetic member, elastic bracing member and control bead, so the components of simple construction can be easily manufactured in batch mode, thus reducing the manufacturing cost and improving the economic benefits.
The improvements brought about by this invention are as follow:
Based on the structural configuration wherein when the control bead is aligned with the radial through-hole of the slot in a positioning state, the centerline surpasses the end surface of the radial groove, so the embedded positioning state of the control bead becomes more stable, eliminating efficiently the positioning tolerance. Meanwhile, the recessed positioning state of the internal slider is made more accurate and stable without loosening and jittering.
A lateral recess 20 is recessed externally onto one side of the hollow rod 10, and the radial through-hole 14 is aligned with the center of the lateral recess 20.
An internal slider 30 is assembled into the slot 13 of the hollow rod 10 in an axial sliding and non-rotating state. The internal slider 30 is provided with a tool head abutting end 31 and a radial groove 32.
A magnetic member 40 is assembled onto the tool head abutting end 31 of the internal slider 30.
An elastic bracing member 50, made of a spiral spring, is assembled between the inner end of the internal slider 30 and the inner wall 130 of the slot 13, and used to support elastically the internal slider 30. A groove 33 is set at inner end of the internal slider 30 for embedding of the elastic bracing member 50.
A control bead 60, made of a steel ball, is assembled into the radial groove 32 of the internal slider 30. The control bead 60 is elastic with assembly of an elastic member 61 (e.g.: a spiral spring). Moreover, the exterior of the control bead 60 is aligned with the radial through-hole 14 of the slot 13, so it can be protruded elastically into the space of the lateral recess 20 in a positioning state, or retracted under external force.
Furthermore, an end cover 70 is assembled onto the exterior of the tool head inserting end 12 of the hollow rod 10. The end cover 70 is also provided with a reducing port 71. The end cover 70 is arranged for the purpose of decoration, labeling and skidproofing.
The slot 13 of the hollow rod 10 includes around internal slotted section 131 and a hexagonal external slotted section 132. A cylindrical section 301 and a hexagonal columnar section 302 are arranged externally onto the internal slider 30, so that the sliding of the internal slider 30 can be positioned without rotation through polygonal mating of the hexagonal columnar section 302 and the hexagonal external slotted section 132.
A groove 34 is set centrally onto the tool head abutting end 31 of the internal slider 30, so that the magnetic member 40 is embedded into the groove 34 for stable positioning.
Based on the above-specified structural configuration, the present invention is operated as follows:
Referring to
When the internal slider 30 is to be released from the tool head 80, referring to
Referring to
Referring also to
Referring also to
Number | Date | Country | Kind |
---|---|---|---|
98208038 U | May 2009 | TW | national |
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Number | Date | Country | |
---|---|---|---|
20100282034 A1 | Nov 2010 | US |