JPS6219232Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for adjusting the height of legs of various types of furniture such as desks, tables, and chairs.

In this kind of height adjustment device for furniture legs, as shown in Japanese Patent Application Laid-Open No. 49-112760, fixed legs of the left and right legs are configured to be extendable and retractable by a fixed leg and a movable leg. A hollow frame is constructed between them, and within the frame there are screw rods with reverse threads carved on both sides of the center, and a pair of internally threaded members screwed into the threaded portions on both sides of the screw rod and both legs. The height of the leg body is adjusted by connecting the movable leg with a support arm made of a pipe or bar, and by operating the handle, the movable leg is raised and lowered via the support arm by the turnbuckle action of the screw rod and the female screw member. The configuration is publicly known. However, with such conventional devices, for example, in the case of a desk, the upper load of the top plate and objects installed on the top plate is concentrated from the support arm to the threaded part of the female thread member and the screw rod, resulting in a large screw load. However, the handle became difficult to operate, and the screws became deformed during long-term use, resulting in problems with durability. In addition, since the support arm is installed diagonally between the top plate and the hollow frame, and the arm protrudes largely between the legs, the space between the top plate and the hollow frame becomes essentially a dead space. . For this reason, it is not possible to incorporate ancillary structures such as extractors into the space, and even if they are incorporated while avoiding the space, there are significant restrictions on dimensions and the like.
Furthermore, since the entire support arm is largely exposed, it has various drawbacks, such as an unsightly appearance.

Therefore, the present invention eliminates the above-mentioned drawbacks in a furniture leg height adjustment device using such a turnbuckle mechanism, improves both handle operability and durability, and also eliminates the generation of dead space and deterioration of aesthetic appearance due to the support arm. The aim is to prevent this.

In this invention, a frame is attached between the fixed legs of a pair of legs that are extendable and retractable with a fixed leg and a movable leg. A screw rod is rotatably supported between the two brackets, the screw rod having threads in opposite directions carved in a predetermined range on both sides with the center as a boundary, and the screw rod is provided with a rotating handle at one end, A pair of female screw members are screwed into the threaded portions on both sides so as to be freely advanced and retractable, and elastically deformable support arms each made of a plate spring are provided between the female screw members and the movable legs of both leg bodies. It is provided in a curved state in contact with the arm guide portions of both side brackets.

Embodiments of the present invention will be described below with reference to the drawings.

Reference numerals 1 and 2 denote a pair of left and right legs, each of which is configured to be extendable and retractable by fitting a square pipe-shaped fixed leg 3 and a movable leg 4 in a telescopic manner. In this embodiment, the present invention is applied to a desk leg, and a base 5 is attached to the lower end of the fixed leg 3, and a top plate 7 is attached to the upper end of the movable leg 4 via a mounting bracket 6. Note that illustration of incidental structures such as a drawer is omitted.

Between the fixed legs 3 and 3 of the left and right legs 1 and 2, a frame 8 whose upper part is open and which also serves as a connecting member for the legs 1 and 2 is suspended and fixed horizontally, and thick plates are installed on both sides of the frame 8, respectively. A bracket 9 consisting of the following is provided. This bracket 9 has a bearing part 1 below an arm guide part 10 which has a gently concave curved surface.
The arm guide section 10 is attached to both ends of the frame 8 with the upper part of the arm guide section 10 protruding upward from the frame 8. To explain this attachment means in detail, on the frame 8 side, there is a V at the upper edge of both ends.
A notch 12 in the shape of a letter and a pawl hole 13 are provided on the bottom surface, and on the bracket 9 side, a stepped portion 14 is provided on both intermediate edges of the arm guide portion 10, and a pawl piece 15 is provided on the lower end of the bearing portion 11. The brackets 9 are attached to both sides of the frame 8 by engaging the brackets 14 with the claw holes 13 and the stepped portions 14 with the notches 12, respectively. However, the means for attaching the bracket 9 may be changed to other methods such as welding or screwing.

Inside the frame 8, there is provided a screw rod 16 that extends nearly the entire length of the frame 8 and has threaded portions 16a, 16b in opposite directions on both sides of the center. The central portion and a predetermined range of both ends of this screw rod 16 are unthreaded portions, and both unthreaded ends are rotatably supported by bearing portions 11 of both side brackets 9. Both side threaded parts 16a of this screw rod 16,
Female screw members 17 and 18 are screwed into each of the screw rods 16b so as to be able to move forward and backward, so that the rotation of the screw rod 16 produces a turnbuckle effect in which both the female screw members 17 and 18 simultaneously move in opposite directions. In addition, in order to efficiently perform this turnbuckle action and make height adjustment easier, the screw rod 16 is used.
Both side threaded parts 16a, 16b and female threaded member 1
The female threads 7 and 18 are double thread threads.

Reference numeral 19 denotes a handle for rotating the screw rod 16, which is connected to the right end of the screw rod 16 and provided outside the upper end of the fixed leg 3 of the right leg 2. That is,
This handle 19 has a round pipe-shaped handle shaft 20.
The handle shaft 20 enters into the frame 8 through a handle attachment hole 21 provided at the upper end of the fixed leg 3 and is fitted onto the right end of the screw rod 16. Pin holes 22 and 23 are provided at the right end of the screw rod and the end of the handle shaft, respectively.
23, the pin 24a of the stopper 24 formed by integrally combining the pin 24a and the retaining ring 24b is inserted, and the retaining ring 24b is elastically engaged with the end of the handle shaft, thereby attaching the handle shaft 20 to the right end of the screw rod 16. It is removably attached to the section. Reference numeral 25 designates a stopper attachment/detachment hole for attaching or removing the stopper 24 as described above, and is provided on the bottom surface of the right end portion of the frame 8.
Further, 4a is a long hole provided in the movable leg 4 for escape of the handle shaft.

The above handle mounting hole 21, pin hole 2 of screw rod 16
2. The handle mounting structure, such as the stopper removal hole 25, is as follows:
The left side leg 1, the frame 8 and the screw rod 16 are provided in exactly the same way at the left end, and according to the rearrangement of the desk, etc.
Alternatively, the mounting position of the handle 19 can be arbitrarily selected or changed from left to right as desired.

Reference numerals 26 and 27 denote left and right support arms, each of which is made of a leaf spring, with one end attached to the upper end of the movable leg 4 of both leg bodies 1 and 2, and the other end attached to both female screw members 17 and 18. ing. In this case, both support arms 26 and 27 are curved at the middle part using the elasticity of the leaf spring, and the curved middle part is brought into contact with the arm guide part 10 of both side brackets 9 and 9, and the upper part is They are attached to the inner surfaces of the legs 1, 2 between the movable legs 4, 4 and the female screw members 17, 18 as described above, with the lower portions aligned with the threaded rods 16 within the frame 8, respectively. In this way, both support arms 26, 27 as a whole are
It is attached in a shape that is elastically deformed, and is configured to be moved up and down while always in contact with the arm guide portions 10 of the brackets 9, 9 in accordance with the turnbuckle motion of the screw rod 16 and both female screw members 17, 18 while in this shape. ing. 28, 28 are both support arms 2
6, 27 and bracket arm guide parts 10, 10
The arms 26 and 27 are attached to both ends of the frame 8, and the arms 26, 27 are passed between the arm guide pins 28, 28 and the arm guide parts 10, 10.

In addition, the support arm 2 is provided within the frame 8.
A floating stopper 29 in the form of a band plate is provided above 6 and 27. This floating stopper 29 has elongated holes 30, 30 symmetrically on both sides.
By engaging the protrusions 31, 31 provided on the upper surfaces of both female threaded members 17, 18, the stopper 29 is inserted into the female threaded member 1 within the range of the elongated holes 30, 30.
It is attached so that it can freely move left and right with respect to 7 and 18. In other words, the female thread members 17, 18
can be screwed forward and backward relative to the screw rod 16 only within the range of the elongated holes 30, 30 of the floating stopper 29, thereby controlling the amount of elevation of the movable leg 4 (height adjustment amount of the legs 1, 2). It is configured to be regulated to a certain extent.
32 is a washer for fixing the floating stopper 29 and the lower end of the support arm to the protrusion 31.

In the above configuration, when the screw rod 16 is rotated in a predetermined direction by the handle 19 in order to increase the height of the leg (top plate height), both female threaded members 17 and 18 move away from each other on the screw rod 16 due to turnbuckle action. Move direction synchronously. As a result, both support arms 26, 27 are simultaneously pushed outward, and movable legs 4, 4 of both leg bodies 1, 2 are simultaneously pushed up by the arms 26, 27. In this way, both legs 1, 2
At the same time, the height is adjusted to the higher side. Also, by rotating the handle in the opposite direction to the above, both movable legs 4,
4 is lowered and the height of the leg body is adjusted to the lower side. Such height adjustment itself is basically the same as in the conventional device. Therefore, when using this device, both support arms 26 and 27 are curved into an L shape using the elasticity of the leaf spring, and the middle portion, which is the curved point, is connected to the brackets 9 and 27 provided on both sides of the frame 8. 9, the upper load from the top plate 7 and objects installed on the top plate is transferred to the brackets 9, 9 and the female screw members 17, 1 via the support arms 26, 27.
8 and the threaded part of the screw rod 16 (hereinafter referred to as the threaded part). That is, since the load is distributed to the two locations, the load on the threaded portion is halved compared to the conventional device in which the load is concentrated on the threaded portion. For this reason, handle 1
9 becomes easier to rotate, height adjustment work becomes easier, and the threaded portion does not deform even after long-term use or under heavy loads, improving durability. In addition, since the operation is basically easier as described above, it is possible to speed up the height adjustment work by adopting double thread screws for the screw rod 16 and the female thread members 17 and 18 as in this embodiment. It will become.

Further, since both support arms 26 and 27 are attached in an L-shaped curved state along the legs 1 and 2 and the frame 8, and move as they are, the two support arms 26 and 27 are
6 and 27 are the legs 1 and 2, the frame 8 and the top plate 7
It hardly protrudes into the space formed by the above, and the space can be secured as an effective space as it is. Therefore, this space can be used as a space for installing ancillary structures such as a drawer, and the appearance is very good.

On the other hand, when adjusting the leg height, the female screw members 17 and 18 are connected to the long holes 3 on both sides of the floating stopper 29.
0, 30, and both female screw members 17, 18
When both of the legs 1, 2 reach the outer ends of the long holes 30, 30 on both sides and are prevented from moving further, the legs 1, 2 reach their maximum height. By the way, such a stopper action is possible even when the above-mentioned floating stopper 29 is not provided, when the female screw members 17 and 18 are attached to the brackets 9 and 18.
This is achieved by contacting the bearing portions 11, 11 of 9. However, if this is done, there is a risk that the brackets 9, 9 may be deformed or damaged by the powerful screw thrust. Therefore, in this embodiment, the floating stopper 29 is provided separately from the brackets 9, 9 to protect the brackets 9, 9 and to obtain a reliable stopping action. Further, when using this floating stopper structure, both female screw members 1
Even if the positions 7 and 18 are not symmetrical, they will eventually reach both ends of the elongated hole of the stopper 29, and the stopper action will be performed simultaneously on both the left and right sides. That is, when the stopper 29 is fixed to the frame 8, or when the stopper members are fixed to both sides of the frame 8, the stopper action is performed only on either the left or right side due to installation error (this results in uneven contact). ), and the desired stopper action becomes even more reliable. Further, as described above, there is no need to specify the relative positional relationship between the floating stopper 29 and the female screw members 17 and 18, so assembly is simplified.

Note that a cover is attached to the opening of the frame 8 in order to protect the turnbuckle mechanism etc. housed in the frame 8, to prevent the user's clothes from coming into contact with the mechanism, etc., and to maintain the aesthetic appearance. You can. Also, regarding the support arms 26 and 27,
A cover may be used for the same purpose. On the other hand, in this embodiment, the mounting bracket 6 of the top plate 7 is removably attached to the upper end of the movable leg 4 with screws. I'm trying to make it replaceable.

Further, the present invention is not limited to the above embodiments, and can be implemented with various modifications as follows.

(b) Regarding the screw rod 16, in the above embodiment, the screw rod 1
6 is formed from a single rod, but the threaded portions on both sides may be formed from separate screw rods, and the screw rods on both sides may be connected with a joint such as a pipe to form a single screw rod. In this configuration, by preparing joints of multiple lengths, large and small, and changing the length of the joint according to the distance between the legs 1 and 2, both sides of the screw rod can be shared regardless of changes in the distance between the legs. I can do it. Therefore, the cost is low.

(b) Regarding the structure for attaching and detaching the handle 19 to the screw rod 16, in order to facilitate attachment and detachment of the stopper 24 shown in the above embodiment, a knob 24c is attached to the retaining ring 24b of the stopper 24 as shown in FIG. May be installed. Furthermore, instead of using such a stopper 24, a simple pin fastening method may be adopted, or a screw rod 16 and a handle shaft 2 may be used.
A means for attaching the handle 19 to the screw rod 16 by providing a pin on one side of the screw rod and a hook-shaped notch on the other side, or the outer peripheral surface of the screw rod end and the inner peripheral surface of the handle shaft 20 by engagement of the notch and the pin. It is also possible to form them into corresponding square shapes and to fit and connect them.

However, in the present invention, attachment and detachment of the handle 19, that is, compatibility between the left and right sides, is not an essential requirement.
The handle 19 may be fixed to either the left or right side. In addition, this invention is not limited to desk legs, but also various tables (such as living room center tables),
Chairs (especially large chairs or settees), etc.
Applicable to various furniture legs.

As described above, the present invention connects the female threaded member of a turnbuckle mechanism consisting of a screw rod and a pair of female threaded members with a movable leg by a support arm, and raises and lowers the movable leg via the support arm by the turnbuckle action to raise and lower the height of the leg. In the height adjustment device for furniture legs, both support arms are formed of leaf springs,
By utilizing the elasticity of this leaf spring, both arms are curved along the legs and screw rods, and the intermediate parts are in contact with the brackets provided on both sides of the frame, and are installed between the female screw member and the movable leg. , the upper load is shared between the bracket and the threaded portion of the turnbuckle mechanism to reduce the threaded load. This makes the height adjustment operation using the handle easier, and also prevents deformation of the screw and improves durability. Further, since both support arms do not protrude into the upper space of the frame, the space can be used as a space for installing a drawer or other incidental structures.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a partially sectional front view, Fig. 2 is an enlarged sectional view taken along the line of Fig. 1, Fig. 3 is an enlarged exploded perspective view of the main parts, and Fig. 4. FIG. 3 is an enlarged perspective view showing a modification of the handle stopper. 1, 2...Left and right legs, 3...Fixed leg, 4...Movable leg, 8...Frame, 9...Bracket, 10...Arm guide portion of the same bracket, 16...Screw rod, 16
a, 16b...both side threaded portions, 17, 18...female threaded member, 19...handle, 26, 27...support arm.

Claims (1)

[Scope of utility model registration request] A frame is attached between the fixed legs of a pair of leg bodies that are extendable and retractable with a fixed leg and a movable leg, and a bracket having a concave curved arm guide portion is provided on both sides of the frame, and
A screw rod is rotatably supported between the two brackets, with screw threads in opposite directions carved in predetermined ranges on both sides of the center, and a rotating handle is provided at one end of the screw rod, and a screw rod is provided on one end of the screw rod, and a screw rod is provided with a rotating handle on one end. A pair of female screw members are screwed into each other so as to be freely advanced and retractable, and elastically deformable support arms each made of a plate spring are provided between the female screw members and the movable legs of both leg bodies, and the intermediate portions of the arms are connected to the arms of the both side brackets. A height adjustment device for a furniture leg, characterized in that it is provided in a curved state in contact with a guide portion.