Abstract The invention applies to locking means designed to prevent the theft of diamond needles from phonograph tone arms. In the sale of phonograph and stereo equipment a diamond needle is used on the tone arm in coaction with a record. The diamond needles are quite valuable and where the equipment is on display to purchasers the needles are frequently stolen. The invention keeps the needle locked against theft and allows the salesman to quickly and easily remove the locking means and demonstrate the operation of the phonograph. The construction of the locking means is designed for universal application to phonographic equipment and is economical to produce. The invention is also applicable to protecting other elements against theft or misuse.
A locking device for phonographic diamond needles and the like comprising in combination with the tone arm and sound needle in a phonograph record player, a two-part telescopic casing, one of which parts is closed at one end and open at the opposite end, the other part being open at one end and closed at the opposite end except for a restricted opening shaped for the reception of the portion of the tone arm opposite from the needle-carrying end, the second mentioned casing part being positioned as stated on the tone arm, the first mentioned casing part being inserted from its open end over the open end of the second mentioned casing part, and means for locking the casing parts one to the other to prevent access to the needle from the exterior of the casing and having means for unlocking the casing parts to expose the diamond needle for its operation with the record.
Claim 2
Dependent Claim
155 words
A locking device for phonographic diamond needles and the like comprising in combination with the tone arm and sound needle in a phonograph record player, a two-part telescopic casing, one of which parts is closed at one end and open at the opposite end, the other part being open at one end and closed at the opposite end except for a restricted opening shaped for the reception of the portion of the tone arm opposite from the needle-carrying end, the second mentioned casing part being positioned as stated on the tone arm, the first mentioned casing part being inserted from its open end over the open end of the second mentioned casing part, and means for locking the casing parts one to the other to prevent access to the needle from the exterior of the casing and having means for unlocking the casing parts to expose the diamond needle for its operation with the record.
Claim 3
Dependent Claim
50 words
A locking device as set forth in claim 1, in which the second mentioned casing part has a substantially large opening in its side wall as an extension of the restricted opening and adjacent to the end of the second mentioned casing part opposite to the restricted end opening therein.