JPH0130099Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention lays a number of rails in a limited space such as a reference room or parts storage, and arranges a large number of them so that they can run freely on the rails, allowing items to be taken out when needed. This relates to a movable shelf with an open passage.

[Conventional technology]

As a conventional movable shelf, there is a manual movable shelf of the type that transmits the rotational force of the handle to the traveling wheels via a chain and is equipped with a drive device that has an alignment mechanism interposed between the handle and the chain drive sprocket (Utility Model Shelf 1973- 41084, Japanese Patent Publication No. 57-14173, Utility Model Publication No. 107038-1982, Japanese Patent Publication No. 116313-1987).

The alignment mechanism between the handle and the chain-driving sprocket in the above-mentioned conventional manual movable shelf drive device is such that the sprocket side has a disc with multiple notches at equal intervals on the periphery, and the handle-side disc has a handle hanger. The lower end of an arcuate cam is pivoted by pins on the left and right sides of the edges that match the direction, the handle is rotatable about the handle shaft, and the handle shaft side has a toothed disc, and the handle has a dish-shaped part that surrounds the disc. A hook with a claw that engages with the teeth of the disk in a direction other than the hanging direction of the handle is hung from the recess, and a hook that hangs from the toothed disk on the handle shaft side is attached to the base side of the handle. It is equipped with a pendulum-type hook with a protrusion on the tip side that engages only below this point.

The alignment mechanism between the handle and chain drive sprocket of each of the above movable shelves is such that when the handle begins to rotate in either the left or right direction from the hanging position, the cam or hook engages with the teeth of the toothed disc. When the disk is rotated and the handle approaches the end of one rotation, and the rotational force is lost at this point, the engagement of the cam or hook is released and the handle returns to its hanging position under its own weight, allowing one shelf to be moved by the handle. Even if the other shelves move accordingly, the handles of the other shelves do not rotate and remain in the hanging position.

[Problem that the invention attempts to solve]

However, in the above-mentioned conventional handle alignment mechanism for each movable shelf, when the shelf moves and stops at a predetermined position, if the handle is oriented upward, it may be difficult for the shelf to hang down naturally due to its own weight.

The purpose of this invention is to provide a driving device for a movable shelf that, when the movable shelf is stopped and the handle is released, the handle reliably returns to its hanging position due to its own weight.

[Means for solving problems]

In order to solve the above problems, this invention has a handle alignment mechanism in which the chain drive sprocket is loosely fitted onto the handle shaft, the secondary sprocket is coaxially fixed to the chain drive sprocket, and the diameter of the secondary sprocket is fixed to the handle shaft. The central part of the sub sprocket drive arm, which has a slightly smaller dimension, is fixed to the handle in a direction perpendicular to the handle, and the lower end is fitted into the valley between the adjacent teeth of the sub sprocket. This is a manual shelf drive device in which a hanging piece to which a pin to be matched is fixed is swingably supported by a connecting pin, and a link arm is crossed between the midpoints of both hanging pieces.

〔Example〕

FIG. 1 and FIG. 2 show an example of a drive device unit that is attached to one short side wall of a manual movable shelf (not shown), in which a chain 3 is installed between upper and lower sprockets 2a and 2b in a vertically flat hollow frame 1.
is tensioned, the upper sprocket 2a is driven by a shaft (handle shaft) 5 to which a handle 4 is attached outside the frame, and the lower sprocket 2b directly or indirectly applies rotational force to the running wheels (not shown) of the movable shelf. is fixed to the drive shaft 6 to which the power is transmitted.

As shown in FIG. 5, the upper sprocket 2a is loosely attached to the shaft (handle shaft) 5, and a large diameter sub sprocket 7 is coaxially fixed to this sprocket.

Figure 4 is its plan view, Figure 3 is the hollow frame 1
2 is a front view with the front plate 8 removed, and the handle shaft 5 has a central part in the length direction of the sub sprocket drive arm 9, which has a dimension length slightly smaller than the diameter of the sub sprocket 7, and is perpendicular to the handle 4. It is fixed in the direction of

At both ends of the auxiliary sprocket drive arm 9, hanging pieces 13 are swingably supported by connecting pins 14, each having a pin 12 fixed to its lower end that fits into a valley 11 between two adjacent teeth 10, 10 of the auxiliary sprocket 7. In addition, a link arm 15 is provided between the longitudinally intermediate portions of both hanging pieces 13.

In Fig. 1, reference numeral 16 indicates a stopper mechanism of the running chain 3, and 17 indicates a take-up mechanism of the chain. An advancing/retracting rod 20 having a claw 19 that engages with the teeth is provided with restorability in the backward direction, and this advancing/retracting rod is
As shown in FIG. 2, a cam 22 that rotates together with a knob 21 protruding from the front plate 8 of the hollow frame 1 moves the sprocket 18 forward, so that the sprocket 18 cannot rotate.

Next, the operation of the handle alignment mechanism in this manual movable shelf drive device will be explained.

When the handle 4 is rotated in the direction shown by the one-dot chain line from the state in which it hangs down as shown by the solid line in FIG. The lower end pin 12a of the hanging piece 13a in the rotating direction is the sub sprocket 7.
When the handle is further rotated, the sub sprocket 7 rotates, and the chain drive sprocket 2a rotates accordingly, causing the movable shelf to travel.

Both hanging pieces 13, 13a connect the link arm 1 in the middle.
5, so when the pin of one hanging piece is fitted into the groove of the tooth of the sub sprocket, the pin of the other hanging piece is away from the tooth and does not operate, but when the handle is first operated, it is When rotated in this direction, this other hanging piece is activated.

Turn the handle 4 further from the state shown in Fig. 3 to reach the 6th position.
If you stand upright as shown by the solid line in the figure and stop moving the mobile shelf in this state and release your hand from the handle,
Both hanging pieces are oriented upward, but the center of gravity is shifted to the left, so the pin 12a of the hanging piece 13a, which was operating as shown by the chain line in the figure, comes out of the trough, and therefore The handle 4 returns to the hanging position while rotating in the direction of the chain line in the figure.

In addition, if the handle rotates further from the upright position and stops when facing in the downward direction, simply returning the handle slightly will cause the pin to come out of the trough, and when you release your hand from the handle, it will hang under its own weight.

〔effect〕

By using the handle alignment mechanism in the drive device of the manual movable shelf of this invention, even if the movable shelf is moved by operating the handle, and the handle is in the upright position with the movement stopped, both hanging pieces will remain in place. They are connected by a link arm and remain parallel, and in the operating state, both hanging pieces are inclined at an angle of about 20 degrees with respect to the handle, and the center of gravity is offset in the direction of this inclination.
When you release your hand from the handle, it tries to return in the opposite direction to the drive direction, and at that time, the pin that was fitted into the valley of the teeth of the sub sprocket inevitably comes out, forcing the handle in the return direction. Also, if the handle stops in the rotated position from the upright position, returning the handle slightly will remove the pin that has been fitted into the groove of the tooth, so the next time you release the handle, the handle will move again. It has the effect of rotating in the original rotation direction (progressing direction) due to its own weight and becoming a hanging position.

[Brief explanation of the drawing]

FIG. 1 is a front view of an example of the drive device for a manual movable shelf according to the present invention with the front plate removed, FIG. 2 is a side view of the same, and FIG. 3 is an enlarged front view of the main parts of the same. Figure 4 is the same plan view, Figure 5 is the same side view, and Figure 6 is the same side view.
The figure is a front view of the same essential parts in an operating state, and FIG. 7 is an enlarged front view of the chain stopper mechanism. 2a...Chain drive sprocket, 4...Handle, 5...Handle shaft, 7...Sub-sprocket, 10...Teeth, 11...Trough, 9...Driving arm, 13...Descent piece, 12... ...Mating pin, 1
4...Connection pin, 15...Link arm.

Claims (1)

[Scope of utility model registration request] In a drive device for a manually movable shelf that can freely travel on a rail and transmits the rotational force of a handle to the traveling wheels via a chain, an alignment mechanism is interposed between the handle and the chain drive sprocket, the alignment mechanism being a chain drive sprocket. The drive sprocket is loosely fitted to the handle shaft, and the sub sprocket is coaxially fixed to the chain drive sprocket, and the handle shaft has a lengthwise central portion of the sub sprocket drive arm with a dimension slightly smaller than the diameter of the sub sprocket. is fixed to the handle in a direction perpendicular to the handle, and at both ends thereof, a hanging piece having a pin fixed to the lower end that fits into the valley between the adjacent teeth of the sub sprocket is supported swingably by a connecting pin. A drive device for a manual movable shelf, characterized in that a link arm is extended between the midpoints of the hanging pieces.