JPS5853159B2 - Cylinder lock for filing cabinets, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder lock for locking filing cabinets and the like.

Conventional cylinder locks of this type are held in a holding cylinder fixed to the front of the cabinet so as to be able to slide back and forth, and are urged by a return spring to protrude from the front of the cabinet. The cylinder lock is pushed in against the resistance, and the latch head at the rear of the cylinder lock protrudes, locking it by locking it in a locking hole drilled in the holding cylinder. Normally, this latch is activated by a spring built into the cylinder lock. The latch is pressed in the protruding direction, so just by pushing the cylinder lock body into the holding cylinder, the latch protrudes and locks into the locking hole, locking without the need for a key, and the key is only used for unlocking. Therefore, if the cylinder lock is pushed in by mistake, it is inconvenient that only the person in possession of the key can unlock it.

In addition, in order to eliminate this drawback, a rotor rotatably provided on the cylinder lock body is fixed at two insertion positions for locking and unlocking, and the key can be inserted and removed from the rotor at each of these positions, Some locks are also locked using a key, but this requires two locking grooves in the cylinder lock body to lock the end of the slider fitted with the spring inside the rotor. This makes the structure complicated, and the direction of insertion of the key is inconsistent, making it inconvenient to use.

The cylinder lock of the present invention was made to eliminate the drawbacks of the conventional products described above, and is fixed at one key insertion position,
An eccentric cam is provided protruding from the rear end surface of the rotor, which can be unlocked by a key inserted into the rotor, and an idle gap approximately equivalent to the stroke of the latch is provided at the front of the latch at the rear of the cylinder lock body. A locking groove is provided, and the eccentric cam is fitted into the locking groove, and by rotating the rotor in opposite directions from the key insertion position using the key, the latch head is locked into the cylinder lock via the eccentric cam. In addition to protruding or retracting from the main body to perform locking and unlocking,
After the above-mentioned locking and unlocking, the rotor itself can be returned to the key insertion position, and the latch is elastically held in each of the above-mentioned locking and unlocking positions by an expansion spring and a locking projection. As a result, both locking and unlocking are performed using a key, which eliminates the above-mentioned drawbacks and has the advantage that the key insertion position remains constant, making it extremely convenient to use.

Next, to explain the details with reference to the figures, 1 is the cylinder lock body, 1' is the main body cap, 2 is the rotor, and 3 is rotatably fitted into the main body 1, and is fixed at one key insertion position. , is a latch that can be unlocked by inserting a key, and the main body 1 is held in a holding cylinder (not shown) fixed to the front of the cabinet so as to be slidable back and forth, and is resiliently pressed by a return spring. By pushing this against the return spring, each drawer in the cabinet is locked in the closed position via a locking device connected to the connecting piece 1a at the rear end. In this state, by rotating the rotor 2 with the key inserted into the key insertion hole 2a,
A latch 3 interlocked with this protrudes upward, and an engaging portion 3a at the tip is locked in a locking hole in the holding cylinder, so that each of the drawers can be locked.

As shown in FIGS. 6 and 7, an eccentric cam 4 is provided on the rear end surface of the rotor 2 and extends laterally from the center thereof. As shown in FIG. 4, the eccentric cam 4 is fitted, and as the rotor 20 rotates, it engages with the eccentric cam 4 and moves the latch 3 to the locked or unlocked position. A suitable play gap is provided between the opposing engaging surfaces 5 and 60 so that only the cam 4 can return to its original position, that is, a play gap approximately corresponding to the stroke of the latch, and rotation of the eccentric cam 40 is inhibited. An engaging groove 7 is provided with a longitudinal restraining edge 7' to prevent the latch 3 from moving upward. Further, expansion springs 8°8 are protruded from both sides of the upper part of the latch 3.
are provided with locking protrusions 9, 9 for locking this.

Reference numerals 10 and 10 indicate relief grooves for the spring 8 provided in the latch 3.

To explain the operation of this cylinder lock, Fig. 3 shows the unlocked state, and when the eccentric cam 4 of the rotor 2 is rotated downward by the key from the chain line position to the solid line position where it is restrained by the restraining edge 7', this occurs. The latch 3, which engages with the lower engagement surface 6, is lowered and the engagement end 3a retracts into the main body 1 to be unlocked, and the main body 1 is pushed by the return spring and protrudes from the front of the cabinet, and the engagement of each drawer is released. Since the lock is released, the eccentric cam 4 lever is rotated again to the chain line position and the key is removed from the drilled hole 2a.

At this time, the expansion springs 8, 8 are locked to the lower portions of the locking protrusions 9, 9, and the latch is maintained in the unlocked state.

For locking, push the main body 1 into the cabinet against the return spring to lock it like a drawer, and use the inserted key to move the eccentric cam 4 from the chain line position to the locking edge T in the opposite direction to the unlocking case.
', the latch 3 engaged with the upper engagement surface 5 rises, and the engagement end 3a protrudes from the circumferential surface of the main body 1 and engages with the engagement hole of the holding cylinder. Each drawer is locked.

(Figure 4). Therefore, after locking, the eccentric cam 4 can be returned to the original chain line position and the key can be removed from the drilled hole 2a.

At this time, when the latch rises, the locking protrusions 9, 9 on the main body bend inward.
The expansion springs 8, 8 which have passed through are expanded again and resiliently engage the upper portions of the protrusions 9, 9, thereby preventing the latch 3 from lowering.

In this cylinder lock, the main body 1, rotor 2, latch 3, etc. can be molded using synthetic resin, etc. In this case, the expansion springs 8, 8 may be integrally formed by embedding leaf springs in the latch 3. Further, as shown in FIG. 5, the latch body 3 and the spring 8
The engaging end portion 3a and the like may be formed separately and joined together by adhesive or the like.

Further, the eccentric cam 4 may be an eccentric pin protruding from the end surface of the rotor 2.

The cylinder lock of the present invention has the above-mentioned structure, and is locked and unlocked using a key, so even if the cylinder lock is accidentally pushed into the holding cylinder, it will not be locked like a conventional cylinder lock. Moreover, since the key insertion position is one and constant, it is extremely convenient to use, and has the advantage that it is simple in structure and extremely easy to manufacture.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a vertical side view showing a locked state, and FIGS. 3 and 4 are A of FIG. 2 showing an unlocked state and a locked state, respectively. 5 is a sectional view showing another embodiment of the latch, FIG. 6 is a side view of the rotor, and FIG. 7 is an end view thereof. 1... Cylinder lock body, 2. Bent rotor, 3.
Curved latch, 4... Curved eccentric cam, 5... Curved engagement groove, expansion spring, 9... Locking protrusion. 8...-...

Claims (1)

[Claims] 1 It is held in a holding cylinder fixed to the front part of the cabinet so as to be able to slide back and forth, and is urged by a return spring to protrude from the front part of the cabinet. In a cylinder lock in which the latch head is made to protrude and is locked by being locked in a locking hole drilled in the holding cylinder, the cylinder lock is rotatably fitted into the cylinder lock body 1.
An eccentric cam 4 is provided protruding from the rear end surface of the rotor 2, which is fixed at a key insertion position and released from the fixation by the inserted key. The latch 30 is approximately located between the upper and lower retaining surfaces 5 and 60 facing each other.
A retaining groove 7 having a play gap corresponding to the stroke and a vertical restraining edge 7' for restraining rotation of the eccentric cam 40 is provided, and the eccentric cam 4 is fitted into the retaining groove 7, and the rotor 2 The eccentric cams 4 engage with the upper and lower engaging surfaces 5 or 6 by rotating in opposite directions from the key insertion position until the eccentric cams 4 are restrained by the restraining edge 7', and the latch 30 The head 3a can be protruded or retracted from the cylinder lock body 1 to perform locking and unlocking, and after the locking and unlocking, the rotor 2 itself can be returned to the key insertion position. The latch 3 is elastically engaged with the upper and lower parts of a locking protrusion 9 protruding from the inner surface of the cylinder lock body 1, so that the latch 3 can be moved to each locking and unlocking position. A cylinder lock for locking filing cabinets, etc., which is provided with an expansion spring 8 that is held in place.