JPH08336468A - Elevation device for commodity table - Google Patents

Abstract

PURPOSE: To provide an elevation device for a commodity table whose number of elevation steps can be arbitrarily set in any steps by producing resultant force, when load from a commodity table acts on a rack, to press the rack to a rack guide part by the load and forming a tooth face to hold and to fix the rack between a pinion gear for drive and the rack guide part. CONSTITUTION: Upper and lower racks 10 are set each of upper and lower side walls 9a and 9b of a casing upward and downward and pinion gears 11 to engage with both racks 10 are set midway between both racks 10. When the load from a metal net as a commodity table acted on the racks 10, thereby on the rack 10 abutting on the pinion gear 11 for drive the resultant force is produced to press the rack to the rack guide parts on each sidewalls 9a and 9b and form the tooth faces 10a to hold and to fix the racks 10 between the pinion gear 11 and the rack guide part. Thereby the number of elevation steps can be arbitrarily set in any steps.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device for elevating and lowering an article placing table, for example, a wire netting of a barbecue stove.

[0002]

2. Description of the Related Art The wire mesh of a barbecue stove depends on the type and heat of articles such as vegetables and meat placed on it.
The wire mesh is adjusted up and down according to the taste of baking and the like. As means for adjusting the wire mesh up and down, for example,
As described in Japanese Patent No. 28520, a pair of support arms are rotatably supported by a side wall portion of a furnace body, and the states of the support arms are connected by an interlocking rod to form a parallel link. There is a type in which the height position of the wire mesh can be fixed to a desired position by fastening and fixing an operation lever extending from the lower end of the support arm to an arbitrary position of a fixing plate with a fixing tool.

However, in such a case, when changing the height position of the wire mesh, the fixing tool fixing the operation lever to the fixing plate is temporarily loosened and then the operation lever is operated to set the height position of the wire mesh to a desired height. After that, the fixing tool must be fixed again, and the operation is troublesome.Furthermore, if the fixing tool is not fixed enough, the wire mesh and vegetables, meat etc. There is a problem that the wire mesh lowers due to the load of the article, and in addition, since the wire mesh is moved up and down by a parallel link, the position of the wire mesh relative to the furnace main body changes as the wire mesh moves up and down.

In order to solve such a problem, for example, as disclosed in Japanese Patent Laid-Open No. 6-233727, a push-up contact surface having a different distance from the shaft center is provided on the peripheral surface of the rotary shaft of the knob. It is known that the wire mesh can be operated up and down by pushing up the raising and lowering arms intersecting at the middle with the pushing up contact surface.

[0005]

However, in the lifting device for the article mounting table described in Japanese Patent Laid-Open No. 6-233727, a push-up contact surface for pushing up the lifting arm is formed on the peripheral surface of the rotary shaft of the knob. Therefore, there is a problem that the number of push-up contact surfaces formed is limited and that it is impossible to form a sufficient lift.

Therefore, the present invention has been proposed in view of the above-mentioned problems, and it is possible to arbitrarily set the number of steps of raising and lowering, to secure a sufficient lifting height, and to provide an apparatus for raising and lowering an article placing table. That is the purpose.

[0007]

In order to achieve the above-mentioned object, a lifting device for an article placing table according to the present invention comprises a rack for raising and lowering the article placing table, and a drive pinion gear for driving the rack forward and backward. The drive pinion gear includes a rack guide portion facing the drive pinion gear and maintaining the meshing between the rack and the drive pinion gear. When the load from the article mounting table acts on the rack, the drive pinion gear is loaded by the load from the article mounting table. A tooth surface for generating a combined force for pressing the rack against the rack guide portion and forming a tooth surface for sandwiching and fixing the rack between the drive pinion gear and the rack guide portion is formed on the rack at the portion abutting against the rack. To do.

[0008]

In the article placing table raising / lowering device of the present invention, when the drive pinion gear is rotated, for example, in a direction of raising the article placing table, a rack meshing with the drive pinion gear is sent and connected to the rack. The article mounting table rises. Then, when the driving operation of the drive pinion gear is stopped at the desired height of the article placing table, the load from the article placing table attempts to rotate the driving pinion gear in the direction in which the article placing table descends.

At this time, the tooth surface of the rack portion with which the drive pinion gear is in contact is in contact with the drive pinion gear with the load from the article mounting table when the load from the article mounting table acts on the rack. Since the rack is formed so as to generate a synthetic force for pressing the rack to the rack guide portion, the synthetic force generated in the rack pushes the rack against the rack guide portion, and as a result, the rack is driven. The rack is clamped and fixed between the pinion gear and the rack guide portion.

Therefore, only by stopping the driving operation of the driving pinion gear, the rack is surely stopped at that position. Further, when the article mounting table is lowered, if the drive pinion gear is rotated in a direction opposite to the direction in which the article mounting table is raised, the article mounting table is lowered. Then, when the rotation of the driving pinion gear to the descending side is stopped at the desired position, the article mounting table is reliably stopped at that position by the same action as described above.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lifting / lowering device for an article mounting table according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a barbecue stove used outdoors such as in a camp.
Indicates an entire barbecue stove. This barbecue stove 1 includes a furnace main body 3 supported by a pair of left and right folding legs 2 and a pair of left and right raising and lowering arms supporting a wire net (article mounting table) 4 pivotably supported by the furnace main body 3. 5.
5 and an elevating device 6 that operates the lower ends of the elevating arms 5 to elevate and lower the wire netting 4.

The furnace main body 3 is formed by pressing a thin iron plate into a shallow box-like shape having an upper opening, a flange 7 is horizontally formed at the upper end edge of the furnace main body, and long air intake holes 8 are formed in the front and rear side walls 3a. The upper ends of the folding legs 2 and the elevating arms 5 are pivotably supported on the side wall 3a near the flange 7 while being formed.

The folding legs 2 and 2 are formed by bending a wire. In the use state of FIG. 1, the bent upper end portion abuts the flange 7 to support the furnace main body 3 for transportation and At the time of storage, the folding legs 2 and 2 can be folded so that the lower ends 2a and 2a thereof come into contact with the bottom surface 3b of the furnace body 3.

The elevating arms 5 and 5 are formed by bending a wire, and an intermediate part of the elevating arms 5 and 5 penetrates the side wall 3a of the furnace body 3 near the flange 7 from the inside to the outside. The lower end portion 5a at the front is connected to an elevating device 6 described later.

An elevating device 6 for swinging the elevating arms 5, 5 has a casing 9 fixed to the central portion of the side wall 3a of the furnace body 3, and one end of the casing 9 is outside the casing 9 as shown in FIG. A rack 10 projecting to the upper and lower sides of the casing 9 is vertically arranged with the upper and lower side walls 9a and 9b as rack guide portions, and a drive pinion gear that meshes with the racks 10 and 10 is provided at an intermediate portion of the racks 10 and 10. 11 are provided.

The drive pinion gear 11 has a drive shaft 12 projecting from the front wall 9c of the casing 9, and an operating knob 13 is attached to the projecting tip portion. Also,
A vertically-long connecting hole 14 is provided at an end of the rack 10 protruding outside the casing 9, and the bent lower end portions 5a and 5a of the elevating arms 5 and 5 are fitted into the connecting hole 14.

As shown in FIG. 3, when the load from the wire net 4 acts on the rack 10 via the elevating arm 5 as W, the tooth profile of the rack 10 is generated by the acting force W and the driving pinion gear 11. Drag (drive pinion gear 11
Force acting from the center C1 of the center of the drive pinion gear 11 to the extension of the line connecting the contact points C2 of the rack 10)
An inclined tooth surface that generates a combined force W2 that presses the rack 10 against the upper and lower side walls 9a and 9b of the casing 9 on the rack 10 at a portion where the combined force W2 with W1 contacts the drive pinion gear 11. 10a is formed.

The procedure for using the barbecue stove 1 configured as described above will be described below. First, when carrying it outdoors such as in a camp, the folding legs 2.2 are folded and conveyed so that the lower ends 2a and 2a contact the bottom surface 3b of the furnace body 3. Then, when grounding at a predetermined place, the folding legs 2 and 2 are folded up so that the bent upper end portion comes into contact with the flange 7 part to support the furnace body 3, and the furnace body 3 is supported by charcoal, solid fuel, etc. After putting on fire, lift arm 5.5
Place the wire net 4 on, and put meat, vegetables, etc. here and bake.

At this time, it is necessary to adjust the height of the wire net 4 according to the degree of burning of meat, the type of vegetables, the heat power, and the like. Therefore, when the height of the wire net 4 is increased, for example, the operation knob 13 is operated to rotate the drive pinion gear 11 in the clockwise direction via the drive shaft 12. Then, the rotation of the drive pinion gear 11 moves the rack 10 above the rack 10 engaged with the pinion gear 11 to the right, and the rack 10 below the rack 10 to the left.

When the tips of the racks 10 and 10 are extended to the left and right, the bending lower ends 5a and 5a of the elevating arms 5 and 5 connected to the vertically long connecting holes 14 at the tips of the racks 10 and 10 are operated. Then, an arc is drawn from the left and right end portions of the furnace body 3 inwardly by drawing an arc around the portion where the tip of the lifting arms 5 penetrates the side wall 3a of the furnace body 3 near the flange 7 from the inside to the outside. It swings toward and raises the wire netting 4 on which meat, vegetables, etc. are placed.

When the driving operation of the drive pinion gear 11 is stopped at the desired height of the wire net 4 in this way, the load from the wire net 4 causes the drive pinion gear 11 to move to the article mounting table as shown by W in FIG. Acts as an acting force that attempts to rotate it in the descending direction. The reaction force W1 from the driving pinion gear 11 acts on the acting force W on the portion where the driving pinion gear 11 is in contact with the rack 10 (contact point C2), and the acting force W and the reaction force W1 A combined force W2 is generated in the rack 10, and this combined force W2 causes each rack 10
10 is pressed against the upper and lower side walls 9a and 9b of the casing 9, and as a result, the rack 10 and 10 is clamped and fixed between the drive pinion gear 11 and the side walls 9a and 9b.

Therefore, only by stopping the driving operation of the driving pinion gear 11, the wire net 4 on which meat, vegetables and the like are placed can be surely stopped at the raised position.

When lowering the wire net 4 on which meat, vegetables, etc. are placed, the operating knob 13 is operated in the opposite manner to the above to rotate the drive pinion gear 11 through the drive shaft 12 in the counterclockwise direction. Then, the upper rack 10 of the racks 10 engaged with the driving pinion gear 11 is moved to the left and the lower rack 10 is moved to the right,
Through the bent lower end portions 5a, 5a of the elevating arms 5, 5 connected to the vertically long connecting holes 14 at the respective tip portions of the racks 10, 10, the tips of the elevating arms 5, 5 are moved from the inside of the furnace body 3 to the left and right. A circular arc is drawn toward the end of the and the wire mesh 4 on which meat, vegetables and the like are placed is lowered.

When the wire net 4 is lowered to the desired height position in this way, the driving operation of the driving pinion gear 11 is stopped.
Then, as described above, the load from the wire netting 4 is W in FIG.
As shown by, the driving pinion gear 11 acts as an acting force for rotating the article mounting table in the descending direction,
Since the reaction force W1 from the drive pinion gear 11 acts on this action force W on the portion (contact point C2) where the drive pinion gear 11 is in contact with the rack 10, the action force W and the reaction force W1. A combined force W2 is generated on the rack 10 by the combined force W2, and the combined force W2 pushes the racks 10 and 10 against the upper and lower side walls 9a and 9b of the casing 9, and as a result, the racks 10 and 10 are driven. It is clamped and fixed between the side walls 9a and 9b.

In the above embodiment, the barbecue stove 1
However, the present invention is not limited to this, and it is possible to open and close the folding legs 2 and 2 to raise and lower the furnace body 3 (article table). It goes without saying that it can be used for raising and lowering other article mounting bases such as an ironing board.

Further, in the above-mentioned embodiment, the tooth surface 10a of the rack 10 is made into a linear inclined surface, but instead of this, it may be recessed as shown by the imaginary line diagram F in FIG. Of course. In this case the rack 10
There is an advantage that it can be stopped more reliably. Further, in the above embodiment, the rack guide portion is formed by the upper and lower side walls of the casing 9, but it is of course possible to form another rack guide portion instead of this.

[0027]

As described above, the raising / lowering device of the article placing table according to the present invention rotates the driving pinion gear to feed the rack, and raises / lowers the article placing table connected to the rack. Then, when the article placing table is at the desired position and the driving operation of the driving pinion gear is stopped, the rack is guided to the rack guide portion by the combined force generated in the tooth flank portion of the rack portion with which the driving pinion gear is in contact. The rack is clamped and fixed between the drive pinion gear and the rack guide portion by being pressed, and the rack is reliably stopped at that position.

Thus, there is an advantage that the number of lifting stages and the lifting height of the article placing table can be easily set to any desired values simply by increasing or decreasing the number of teeth of the rack. Furthermore, there is an advantage that the lifting device for the article mounting table can be implemented at a low cost because it has a simple structure in which only a driving pinion gear and a rack that meshes with the driving pinion gear are combined.

In addition, since it has a simple structure, there is an advantage that the entire apparatus can be compactly assembled.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a barbecue stove.

FIG. 2 is a vertical sectional front view of a lifting device portion of a barbecue stove.

FIG. 3 is an explanatory view of the operation of the lifting device portion.

[Explanation of symbols]

 4 ... Article mounting table (wire mesh) 6 ... Lifting device 9a, 9b ... Rack guide part 10 ... Rack 11 ... Drive pinion gear

Claims (1)

[Claims] 1. A rack for raising and lowering an article placing table, a drive pinion gear for driving the rack forward and backward, and a rack guide portion for confronting the drive pinion gear and maintaining the meshing between the rack and the drive pinion gear. When a load from the article mounting table acts on the rack, a combined force that presses the rack to the rack guide portion is generated by the load from the article mounting table, and a driving force is generated in the rack in a portion contacting the drive pinion gear. A lifting device for an article mounting table, characterized in that a tooth surface for sandwiching and fixing the rack is formed between the pinion gear and the rack guide portion.