Patent Application
20120251861
1. Technical Field
The present invention relates to a shock proof structure of a battery pack for receiving a battery cell. More particularly, the present invention relates to a space formed in a base of a battery pack for receiving a battery cell; especially to a lid for opening or closing the space, as well as shock proof plates on the lid.
2. Related Art
An electrical tool, for example, electrical screw gun, electrical nail gun, electrical screwdriver, electrical driller, electrical wrench, etc, can be driven by a portable battery pack allowing users to use indoor/outdoor anywhere away from the power socket. Conventional battery pack is disposed at a distal end of an electrical tool including a space formed at a side of the base thereof to receive a battery cell, and comprises a lid that opens or closes the space. The battery cell is generally formed in a cylinder shape. Serious shock or collision may easily occur to the battery cell when the electrical tool is under impact or dropped on the ground and cause damage to the battery cell. U.S. Pat. No. 5,792,573 has proposed a plurality of ribs in the space to suppress and protect the battery cell from the impact. However, the result is not ideal.
Another patent, US patent No.20100156350, disclosed a structure for a battery pack of an electrical tool including two inner plates comprising a plurality of arch faces in the space for holding the two sides of the battery cell for positioning.
The latter prior art has a complex structure of an inner plates that increases the manufacturing cost. Besides, even though the resilient material may be used to form the inner plate to increase the shock absorbing ability for the arch faces. However, the stretching limitation of the inner plates limits the shock absorbing ability. Therefore, there are still some improvement can be done in this respect.
The present invention provides a shock proof structure of a battery pack for receiving a batter cell, which comprises shock absorbance to firmly hold the battery cell within the battery pack, as well as provides a simplified structure of the shock proof structure of the battery pack and upgrades the stability of holding the battery cell within the battery pack.
The shock proof structure of a battery pack for receiving a battery cell in the present invention includes a base comprising a space for receiving the battery cell at a side thereof. A lid is connected to the base for closing or opening the space. A plurality of first buckling portions are formed at a bottom of the space, wherein the buckling portions are separated from each other by a distance.
A plate set, including a plurality of plates separated from each other by a gap, with shock absorbance is positioned at an inner sidewall of the lid. The plate set comprises two plates with a gap there-between is symmetrically positioned. The plate has an arm positioned upright in the lid. A bent portion is formed at a distal end of the arm. The plate has a supporting arm formed extending from the bent portion declining towards the inner sidewall of the lid. The support arms of every plate set are symmetrically positioned with the adjacent support to form the second buckling portions with the stretchable gap. The second buckling portion is positioned at a corresponding end to the first buckling portion. Thus, the battery cell can be buckled to be positioned between the first and the second buckling portions.
According to the above depiction, the support arm of the plate has elasticity provided by the arm and the bent portion, and the stretchable gap helps to increase the stretching ability. Thus the ability for shock proof and holding effect of the battery cells between the first and the second buckling portions can be increased, and also the shock proof structure of battery pack may be simplified and upgrade the stability of holding the battery cell within the battery pack.
The embodiment of the present invention further comprises a plurality of plate sets positioned parallel to each other, so are the plates parallel to one another; and a supporting arm is formed in an arch shape, wherein an angle of the supporting arm with respect to the arm is acute.
A plurality of through grooves are formed and separated from each other by a distance, on the lid on the side of the arm to correspond with the supporting arm. A buffering space is formed between the supporting arm, and the bent portion and the arm is connected to the stretching gap and through groove.
The lid is covered by a soft pad made of a rubber material for absorbing the shock from external impact.
The pad fills in the buffering space through the through groove to increase the elasticity of the support arm and the arm.
A plurality of trenches are formed on the outer portion of the pad for providing anti slippery feature; and the trenches are separated from each other by gap.
The distance between the first buckling portion and the second buckling portion is slightly smaller than a dimension of the battery cell.
The base can be inlayed in the distal end of the handle of an electrical tool.
These and other features and advantages of the various embodiments disclosed herein will be better understood with respect to the following description and drawings, in which like numbers refer to like parts throughout, and in which:
Referring to
Accordingly, a plurality of plate sets 4 with shock absorbance, separated from each other by a gap, are disposed on the inner sidewall 31 of the lid 3 (as shown in
The first and second arms 413, 423 of each plate sets 4 are adjacent to each other symmetrically to form a second buckling portion 40 with a stretching gap 43 (as shown in
The lid has a plurality of through grooves 33 separated from each other by a gap and formed between the inner sidewall 31 and outer sidewall 32 (as shown in
According to the above depiction, the elements assembled in the embodiment of the present invention indicates, when the battery cell 6 is placed in the space 211 (referring to
Accordingly, the supporting arms 413, 423 of the plates 41, 42 have elasticity provided by the arms 411, 421 and the bent portions 412, 422, and the stretching gap 43 upgrades the stretching effect. Thus, the shock absorbance and anti slippery effect of the first and second buckling portions 214, 40 buckling the battery cell 6 can be increased, and the shock proof structure of the battery pack can be simplified, and also upgrade the stability of positioning the battery cell 6 within the base of the electrical tool.
Referring to
The above description is given by way of example, and not limitation. Given the above disclosure, one skilled in the art could devise variations that are within the scope and spirit of the invention disclosed herein, including configurations ways of the recessed portions and materials and/or designs of the attaching structures. Further, the various features of the embodiments disclosed herein can be used alone, or in varying combinations with each other and are not intended to be limited to the specific combination described herein. Thus, the scope of the claims is not to be limited by the illustrated embodiments.
