Detachment-resistant shell of light bulb
A detachment-resistant shell of light bulb includes a base and a cover. The base has a lower end forming a first coupling section where has a thread is circumferentially formed. The cover has an upper end forming an opening that forms a second coupling section where has a counterpart thread is circumferentially formed to correspond to and be engageable with the thread. The second coupling section has forms at least one resiliently deflectable member which is provided with a counterpart tooth that corresponds to and is engageable with the teeth of the base. The counterpart tooth includes a counterpart straight side corresponding to the straight side of the teeth and is selectively engageable with the straight side of one of the teeth to constrain reverse rotation.
1. A detachment-resistant shell of light bulb, comprising:
a base, which has a lower end forming an opening around which a first coupling section is circumferentially formed, the first coupling section having a side face around which a thread is circumferentially formed, the first coupling section having a top face on which a plurality of teeth is formed and distributed circumferentially, each of the teeth having a straight side; and
a cover, which has an upper end forming an opening that forms a second coupling section corresponding to and engageable with the first coupling section, the second coupling section having a counterpart side face that corresponds to the side face and around which a counterpart thread is circumferentially formed to correspond to and be engageable with the thread, the second coupling section having a counterpart top face that corresponds to the top face and forms at least one resiliently deflectable member, the resiliently deflectable member being provided with a counterpart tooth that corresponds to and is engageable with the teeth, the counterpart tooth comprising a counterpart straight side corresponding to the straight side, the counterpart straight side of the counterpart tooth being selectively engageable with the straight side of one of the teeth to constrain reverse rotation.
2. The detachment-resistant shell of light bulb as claimed in claim 1 , wherein the resiliently deflectable member of the cover comprises a spring arm.
3. The detachment-resistant shell of light bulb as claimed in claim 2 , wherein the second coupling section of the cover forms an opening, the spring arm projecting from a side wall of the opening, the spring arm being substantially parallel with a direction in which the base and the cover are relatively rotatable for screwing engagement, the spring arm having a free end that is raised upward to form the counterpart tooth.
4. The detachment-resistant shell of light bulb as claimed in claim 1 , wherein one of the first coupling section of the base and the second coupling section of the cover is a circumferentially-extending recess and the other of the first coupling section of the base the second coupling section of the cover is a raised rim corresponding to the recess, the recess and the rim being mateable with each other.
5. The detachment-resistant shell of light bulb as claimed in claim 1 , wherein the side face of the first coupling section of the base is an inside surface and the counterpart side face of the second coupling section of the cover is an outside surface.
6. The detachment-resistant shell of light bulb as claimed in claim 1 , wherein the teeth of the first coupling section of the base and the counterpart tooth of the second coupling section of the cover are of a shape of right angle.
7. The detachment-resistant shell of light bulb as claimed in claim 1 , wherein the direction in which the base and the cover are relatively rotatable for screwing engagement is different from a deflection direction of the resiliently deflectable member.
8. The detachment-resistant shell of light bulb as claimed in claim 1 further comprising an O-ring mounted between the first coupling section of the base and the second coupling section of the cover for water resistance.