JP2565350Y2 - Lifting device for shelves - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device capable of continuously adjusting the height of a shelf or the like of a display shelf, and more particularly to a device for raising or lowering a shelf or the like by a rack and a pinion.

[0002]

2. Description of the Related Art FIG.
FIG. 9 is a perspective view showing an outline of a display shelf in which the invention of a “display shelf shelf lifting device” for which a utility model registration application was filed as No. 9 was made.

[0003] Horizontal leg members are provided at the lower ends of a pair of right and left columns (101).
(102) is fixed, the upper ends of the left and right columns (101) are connected by a cross beam (103), and the left and right legs (102) are connected by the lowermost shelf (104) to form an L-shaped frame. Is formed.

[0004] Each column (101) has a plurality of pairs of lifting and lowering platforms (10).
5) is mounted so as to be able to move up and down, and is synchronously moved up and down along the columns (101) by an interlocking elevating mechanism.

[0005] This interlocking elevating mechanism comprises a pair of right and left elevating tables (1
05), and one drive shaft (106) is installed horizontally, and a gear case is attached to one (left side in the figure) elevator (105).
(107) with a built-in worm gear transmission, and a gear case (10
By engaging the crank handle (109) with the handle shaft (108) protruding from the front of the 7) and rotating it, the drive shaft (10
6) Rotate.

A pinion (not shown) is fixed to each end of the drive shaft (106), and is engaged with a rack (not shown) installed in a direction perpendicular to each column (101). )
Is rotated so that the pair of left and right elevators (105) is moved up and down synchronously.

[0007] Brackets (110) are protruded from the front surfaces of the lift tables (105), respectively, and a shelf plate (111) is mounted on a pair of left and right brackets (110).

A handle shaft (108) projecting from the front surface of the gear case (107) has a bearing (1) mounted on the left bracket (110).
12) is supported near the tip, and is installed at a position spaced downward from the shelf (111) placed on the bracket (110).
The crank handle (109) is inserted from the front of the (111) so that it can be engaged with the handle shaft (108).

In the apparatus shown in FIG. 3, the crank handle (109) is engaged with the handle shaft (108) and rotated to raise and lower a pair of right and left lift tables (105) synchronously. 111)
Height can be adjusted steplessly, but if the rack, which is the main member of the elevating mechanism, is formed by cutting using a gear cutting machine, processing costs are high,
There is a problem that the price of the display shelf increases.

As a method of reducing the processing cost by simply configuring a rack in this type of elevating apparatus, for example, a pseudo rack having a large number of through-holes as disclosed in Japanese Utility Model Publication No. 59-11636 is disclosed. Means of using are known.

FIGS. 4 and 5 are perspective views showing a main part of an elevating device using a pseudo rack composed of a large number of through holes (114), and a pair of right and left vertical guide rails attached to a column.
At the front end of (113), a number of rectangular through holes (114) are
A pseudo rack is constructed by vertically arranging the pinions (115) fixed to both ends of the (106) at a pitch equal to the circumferential pitch of the tooth row.

Worm gear (116) fixed to drive shaft (106)
Then, by engaging the worm (117) fixed to the handle shaft (108) and rotating the handle shaft (108), the pinion (115) is rotated via the drive shaft (106). 115) engages with the pseudo rack formed by the rows of through holes (114) and moves up and down.

[0013]

The means of using a simulated rack in which a number of through holes (114) are arranged in a plate as described above has the advantage that it is simple and easy to manufacture. As shown by the solid line, the distance between the plate surface (113a) and the center (O) of the pinion (115) when the tooth bottom surface (115a) of the pinion (115) is in contact with the plate surface (113a) of the pseudo rack. (L1), as shown by the imaginary line in FIG. 5, a root circle (115a ') having the same diameter as the root surface (115a) of the pinion (115) falls into the through hole (114) of the pseudo rack. At this time, the distance (L1) between the plate surface (113a) and the center (O) of the pinion (115) is different, and the vertical path (T) of the center (O) of the pinion (115) is as shown in FIG. Waving back and forth, elevator (105)
Ascending and descending is not smooth, and the crank handle (10
There is a problem that the rotation of 9) becomes heavy intermittently, the feeling of elevating operation is deteriorated, and vibration and noise are generated.

In view of the above-mentioned problems of the prior art, the present invention provides a dummy rack formed by drilling a large number of through holes in a column and a shelf plate or the like using a pinion meshed with the dummy rack. It is an object of the present invention to provide a lifting device such as a shelf board that can smoothly move up and down a lifting table by preventing a waving phenomenon of a lifting locus of a center of a pinion with respect to a pseudo rack.

[0015]

Means for Solving the Problems To achieve the above object, the present invention is configured as follows.

A pseudo rack is formed by arranging a large number of through-holes at equal intervals in the vertical direction on the plate surface of the column, and the pseudo rack is engaged with a pinion pivotally supported by a lifting table that moves up and down along the column. In a lifting device such as a shelf plate that rotates the pinion to raise and lower the lifting table, a pseudo rack in which the pinion engages with a disk having a disk shape having the same diameter as or slightly larger than the root circle of the pinion. An elevating device for a shelf plate or the like, wherein a guide disk rotating in contact with a surface is provided coaxially with a pinion.

In this case, it is preferable that a guide member is provided on the lifting platform so as to slide up and down on a surface of the support that faces the plate surface of the pseudo rack or on a surface opposite thereto.

The guide disk may be formed integrally with the pinion, or may be formed separately from the pinion, and may be pivotally mounted or fixed coaxially with the pinion.

[0019]

The guide disk provided coaxially with the pinion is always in contact with the plate surface of the simulated rack and rotates, so that the root circle of the pinion does not fall into the through hole of the simulated rack. By setting the elevating trajectory to be parallel to the plate surface of the pseudo rack, the waving phenomenon can be prevented, and the elevating platform can always be moved up and down smoothly.

[0020]

FIG. 1 is a cross-sectional plan view showing a main part of a lifting device according to the present invention, and FIG. 2 is a partially cutaway perspective view seen from the upper left of FIG.

On the inner surface of a pair of right and left columns (1) (only the left one is shown in the figure), a right and left column 1 having a U-shaped cross section is provided.
The pair of guide rails (2) are vertically fixed by bolts (3) so as to substantially form a part of the column (1).

On the front plate (2a) of the guide rail (2), a large number of rectangular through holes (4) are vertically arranged at a pitch equal to the circumferential pitch of the tooth row of the pinion (5). As a result, a pseudo rack is formed in which the pinion (5) can engage and roll.

Each pinion (5) is engaged with a dummy rack formed on each guide rail (2), and the left and right pinions (5) are fixed to both ends of a horizontal drive shaft (6).
The guide rail (2) is configured to roll up and down synchronously by rolling in the guide rail (2).

Outside the pinion (5), a guide disk (7) is provided concentrically with the pinion (5). The guide disc (7) may be formed integrally with the pinion (5), or may be fixed to the pinion (5) or the drive shaft (6) as a separate member, or rotate relative to the pinion (5). If possible, it may be pivoted on the drive shaft (6).

The guide disk (7) has an outer diameter which is the same as or slightly larger than the diameter of the root circle (5a) of the pinion (5), and whose outer peripheral surface is formed before forming the pseudo rack. The pinion (5) prevents the root circle (5a) of the pinion (5) from falling into the through-hole (4) of the pseudo rack by rotating while being in contact with the plate surface (2b) on the back side of the face plate (2a). The vertical path of the center (O) of (5) is always maintained parallel to the plate surface (2b) of the dummy rack, thereby preventing the waving phenomenon and the vertical movement of the vertical platform.

A pair of right and left elevators are provided inside the pinion (5).
(8) is provided. The elevating table (8) is made of a plate material, and supports a driving shaft (6) at an appropriate position so as to move up and down together with the driving shaft (6).

A bracket (9) for mounting a shelf plate is integrally formed on the front end side of the lifting platform (8), and protrudes forward.

The rear end of the lifting platform (8) is bent outward at right angles to form a guide plate (10) facing the front side of the rear plate (2c) of the guide rail (2), and a guide is formed on the facing surface. The member (11) is fixed.

The guide member (11) is made of an appropriate synthetic resin material having a small coefficient of friction, and the guide disk (7) is formed by a plate surface (2b) of the front plate (2a) of the guide rail (2). When it comes into contact with the rear panel, it comes into sliding contact with the rear face plate (2c) or slightly separates.

According to the conventional apparatus, a gear case (12) is mounted inside one of the elevators (8) (left side in the figure), and a worm gear (13) is fixed to a drive shaft (6) therein. The worm (14) meshing with the worm is pivotally supported in the front-rear direction.

The shaft of the worm (14) protrudes forward from the gear case (12), and a portion near the front end is supported by a bearing (15) mounted on a bracket (9), and a handle shaft (16) for raising and lowering drive is provided. Make up.

A support (1), a guide rail (2), a pinion (5), a guide disk (7), a lifting platform on the right side, not shown.
(8), bracket (9), guide plate (10) and guide member (11)
Except for the gear case (12) and the worm gear transmission,
1 and 2 are arranged in symmetrical directions.

In the above elevating device, the handle shaft (16)
When the crank handle is engaged and turned, the worm
(14), the pinion (5) is rotated via the worm gear (13) and the drive shaft (6), and is formed by the through holes (4) arranged in the front plate (2a) of the guide rail (2). It moves up and down while engaging with the dummy rack.

In this case, the guide disk (7) comes into contact with the plate surface (2b) of the front plate (2a) and the guide member (11) comes into sliding contact with the rear plate (2c), thereby forming the pinion (5). In addition, the movement of the drive shaft (6) in the front-rear direction is restricted.

Accordingly, the meshing distance between the pinion (5) and the dummy rack fluctuates only within this small range, so that the proper meshing relationship is maintained, and the lift (8) can be moved up and down smoothly. .

The guide member (11) comes into contact with the rear plate (2c) and slides as the elevator (8) moves up and down. The guide member (11) is formed of a material having a small friction coefficient. Therefore, the sliding resistance is small, and there is no problem in raising and lowering drive.

In the above embodiment, the guide member
(11) is provided so as to face the front surface of the rear plate (2c) of the guide rail (2) which is the surface facing the plate surface (2b) of the front plate (2a) of the pseudo rack, and the front plate (2a) The guide disk (7) and the guide member (11) are sandwiched between the guide disk (7) and the guide member (11) between the guide disk (7) and the guide member (11). Alternatively, the column (1) may be sandwiched.

[0038]

According to the present invention, the following effects can be obtained. (a) Since the guide disk provided coaxially with the pinion is always in contact with the plate surface of the dummy rack and rotates, the root circle of the pinion does not fall into the through hole of the dummy rack,
By setting the elevating locus of the center of the pinion parallel to the plate surface of the pseudo rack, the waving phenomenon can be prevented, and the elevating platform can always be moved up and down smoothly.

(B) Therefore, it is possible to smoothly move up and down with a light force, and to suppress generation of vibration and noise.

(C) It is possible to easily carry out the modification because only the guide disk is added without changing the basic configuration of the conventional elevating device using the dummy rack.

(D) If a guide member is provided on the elevating platform so as to slide up and down on the surface of the column facing the plate surface of the pseudo rack or on the opposite surface, the plate surface of the pseudo rack and the surface facing the same Between the guide disk and the guide member or between the guide disk and the guide member to prevent rattling and vibration of the elevator with respect to the support in the horizontal direction. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view showing a main part of an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view seen from the upper left of FIG. 1;

FIG. 3 is a perspective view showing a conventional display shelf.

FIG. 4 is a perspective view showing a main part of a lifting device using a conventional pseudo rack.

FIG. 5 is an enlarged vertical sectional view of the same main part.

[Explanation of symbols]

(1) Support (2) Guide rail (part of support) (2a) Front plate (2b) Plate surface (2c) Rear plate (3) Bolt (4) Through hole (5) Pinion (5a) Root circle ( 6) Drive shaft (7) Guide disk (8) Lifting platform (9) Bracket (10) Guide plate (11) Guide member (12) Gear case (13) Worm gear (14) Worm (15) Bearing (16) Handle shaft

Claims (2)

(57) [Scope of request for utility model registration] 1. A pseudo rack is formed by arranging a large number of through holes at equal intervals in a vertical direction on a plate surface of a support,
In the lift device such as a shelf board, which meshes a pinion pivotally supported by a lift table that moves up and down along a column, and rotates the pinion, the pseudo rack is the same as the root circle of the pinion. A lifting or lowering device for a shelf plate or the like, in which a guide disk rotating in contact with a plate surface of a pseudo rack with a pinion is provided coaxially with the pinion. . 2. The shelf board according to claim 1, wherein a guide member is provided on the lifting platform so as to slide up and down on a surface of the support column facing the plate surface of the pseudo rack or on a surface opposite thereto. Etc. lifting device.