JP2005226813A - Length adjustable telescopic rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a length adjustable telescopic rod which simplifies the length adjusting operation and has high strength. <P>SOLUTION: A locking hole 9 is bored in an outer side surface of an outer rod 4. A sleeve 6 is provided with engagement holes 15, 16 which correspond to the locking hole 9 under such a condition that an expanded diameter flange 14 of the sleeve is in contact with one end of the outer rod 4. A rod-like fixture means 8 for securing the sleeve 6 and an inner rod 5 so as not to move longitudinally with respect to the outer rod 4, is inserted in the engaging hole 9 and the engagement holes 15, 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a length-adjustable telescopic rod that is optimal for a leg whose height can be adjusted, such as a desk, a table, and a chair.

Conventionally, as a length-adjustable extension rod, a plurality of adjustment holes are drilled in the longitudinal direction of the inner rod at a predetermined interval on the outer periphery of the inner rod facing in the vertical direction, and are combined to face each other. Thus, a pair of substantially semi-cylindrical sleeve divided pieces that form a vertically-oriented sleeve having an enlarged flange at the upper end is sandwiched from both sides of the inner collar, and the inner surfaces of both sleeve divided pieces are Protrusions that can be selectively engaged with the adjustment holes are provided, the protrusions are fitted into the desired engagement holes, and both sleeve split pieces are fitted together with the inner collars into the cylindrical outer casing, In addition, there is one in which the diameter-increased flange is brought into contact with the upper edge of the outer casing (see, for example, Patent Document 1).
JP 2003-79437 A

  When using the conventional length adjustable telescopic heel as described above, for example, as a leg of a table or the like, the outer heel is raised on the floor and the upper end of the inner heel is fixed to the top plate side. As a result, the diameter-enlarging flange of the sleeve fixed to the inner collar as described above abuts on the upper edge of the outer casing, thereby receiving the load in the contraction direction of the legs, that is, downward, and raising the height of the top plate. The adjustment position can be held.

  However, since there is no fixing means for preventing the inner cage and the outer cage from moving relative to each other in the extending direction, that is, the upward movement of the inner cage with respect to the outer cage, for example, the top plate is lifted to move the table. In this case, the inner cage is pulled out of the outer cage, which is very unusable.

  In order to prevent the inner rod from coming out of the outer cage, the screw is tightened into the screw hole provided on the side surface of the outer cage, and the tip of the screw is brought into pressure contact with the side surface of the inner cage. It is also possible to prevent the relative movement in the longitudinal direction, but when such a screw is used, the strength to fix the inner collar is left to the tightening force of the screw, and the top plate In order to securely fix the screw in the adjustment position, it is necessary to increase the screw tightening force. This adjustment work is not only cumbersome, but also scars remain when the tip of the screw is pressed against the side surface of the inner collar, and depending on the adjustment position, the scar on the inner collar may be exposed and the appearance may deteriorate. There is.

  The present invention has been made in view of the above-described problems of the prior art, and it is an object of the present invention to provide a length-adjustable expansion / contraction bar that simplifies the length adjustment work and is excellent in strength.

According to the present invention, the above problem is solved as follows.
(1) A cylindrical outer casing, and an inner casing that is inserted into the outer casing so as to be movable in the longitudinal direction, and has a plurality of adjustment holes formed on the outer surface thereof at predetermined intervals in the longitudinal direction; A protrusion that can be selectively engaged with the adjustment hole of the inner flange, and a flange having an enlarged diameter at one end, and the protrusion is fitted into a desired adjustment hole, and the inner flange and the inner flange And a sleeve capable of preventing relative movement of the inner flange and the outer casing in the contraction direction by contacting the outer diameter flange with one end of the outer casing. A locking hole is formed in the outer surface, and an engagement hole facing the locking hole is provided in the sleeve in a state where the enlarged flange is in contact with one end of the outer casing. The sleeve and the inner flange are fixed to the engagement hole so as not to move in the longitudinal direction with respect to the outer flange. Inserting the Jo fixing means.

(2) In the above item (1), a plurality of adjustment holes are drilled at predetermined intervals in the longitudinal direction on opposite outer side surfaces of the inner collar, and the sleeves are abutted against each other. And a pair of half-divided sleeve segments that are externally fitted to both outer surfaces of the inner collar, and selectively engage with the adjustment holes on each of the inner surfaces of the pair of sleeve segments. Provide possible protrusions.

(3) In the above item (1) or (2), the engagement hole of the sleeve into which the fixing means is inserted is formed by penetrating a protrusion that engages with the adjustment hole of the inner collar.

(4) In any one of the above items (1) to (3), the fixing means is a screw that can be screwed into the engagement hole of the sleeve.

(5) In any one of the above items (1) to (3), the fixing means is a pin that can be press-fitted into the engagement hole of the sleeve.

According to the present invention, the following effects can be achieved.
(A) According to the first aspect of the present invention, the inner collar can be securely fixed in the outer casing through the sleeve so as not to move in the longitudinal direction. In addition, when the diameter-enlarging flange of the sleeve is in contact with one end of the outer casing, the positions of the engaging hole and the outer casing locking hole match, so the screw can be easily passed through the locking hole. Can be fitted into the engagement hole. Further, the load in the contraction direction acting between the outer flange and the inner flange is received by the contact between the diameter-enlarging flange of the sleeve and one end of the outer flange, and the value contraction direction is directly applied to the screw. Since no load is applied, the structure can be made extremely excellent in strength.

(B) According to the invention described in claim 2, the sleeve can be easily molded, and the sleeve can be easily fitted on the outer surface of the inner casing.

(C) According to the invention described in claim 3, the protrusion engaging with the adjustment hole can be reinforced by the fixing means, and the engagement between the protrusion and the adjustment hole is strengthened to improve the strength. It becomes possible.

(D) According to the invention described in claim 4, the sleeve and the inner collar can be securely fixed in the outer casing.

(E) According to the invention of claim 5, the fixing means can be easily fitted into the engagement hole of the sleeve.

  Hereinafter, an embodiment in which the present invention is applied to a leg of a table will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a table (1) to which an embodiment of the present invention is applied as viewed obliquely from front, FIG. 2 is a side view of the table (1), and FIG. 3 is a line III-III in FIG. FIG.

  The table (1) is attached to the four corners of the top plate (2) and the top plate (2), and has four legs (extension rods according to the present invention) (3) ). The top plate (1) can be adjusted in height by adjusting the length of each leg (3) as shown by the solid line and the imaginary line in FIGS.

  Each leg (3) has a cylindrical outer casing (4) that stands up and down on the floor and an upper end fixed to the top plate (2) side, The inner flange (5) that is movably fitted in the direction and fixed to the outer surface of the inner collar (5) as will be described later, and fitted in the outer collar (4) together with the inner collar (5). And a screw (8) forming a rod-like fixing means for fixing the sleeve (6) fixed to the inner rod (5) so as not to be movable in the vertical direction with respect to the outer rod (4). It is formed. In addition, the upper end part of the inner collar (5) in this embodiment is fixed to the bottom face side of the top plate (2) through a side collar (12) assembled in a rectangular frame shape.

  In this embodiment, the inner casing (5) is fixed to the top plate (2) and the outer casing (4) is erected on the floor surface. Instead, the outer casing (4 ) May be fixed to the top plate (2) side, and the inner cage (5) may be erected on the floor surface.

  As shown in FIGS. 1, 4 and 6, the outer casing (4) has a rectangular cylindrical shape, and a screw (8) pointing in the left-right direction is inserted into the upper part of one side surface (4a). One locking hole (9) is formed.

  (10) is a caster attached to the lower end of each outer casing (4). (17) is a slider fixed to the lower end portion of the inner flange (5), and is fitted into the outer flange (4) together with the inner flange (5) so that the lower end portion of the inner flange (5) is bent. Reduce rattling. The slider (17) is made of synthetic resin and, as shown mainly in FIG. 1, a pair of front and rear halved slider divided pieces (17a) fitted to the lower end of the inner collar (5). ) (17b) is formed by abutting the opposing surfaces.

  The inner flange (5) has a smaller rectangular cylinder shape than the outer casing (4) so that it can be fitted in the outer casing (4) so as to be movable in the vertical direction. In (5b), a plurality of adjustment holes (11) are formed at predetermined intervals in the vertical direction.

  The outer rod (4) and the inner rod (5) are not limited to a rectangular tube shape, and may be a circular tube shape, a deformed tube shape, or the like. Further, the inner collar (5) does not necessarily have a cylindrical shape, and may be any shape that can be fitted in the outer collar (4) so as to be movable in the longitudinal direction (vertical direction in the present embodiment). .

  4 is an enlarged exploded perspective view of the main part, FIG. 5 is an enlarged view of a V part in FIG. 3, and FIG. 6 is a transverse sectional view taken along line IV-IV in FIG.

  As shown mainly in FIG. 4, the sleeve (6) is formed of a pair of left and right halved sleeve divided pieces (6a) and (6b) made of synthetic resin. On the inner side surfaces of both sleeve split pieces (6a) and (6b), left and right that can be selectively engaged with one adjustment hole (11) of the plurality of adjustment holes (11) of the inner collar (5) Cylindrical protrusions (13) and (13) that protrude in the direction and face each other, and also on the outer periphery of the upper end, the diameter-enlarging flanges (14) and (14) that can contact the upper end edge of the outer casing (4) Are provided. In this way, the sleeve (6) can be easily formed by dividing the sleeve (6) into a pair of sleeve split pieces (6a) (6b), and the sleeve (6) It can be easily fitted on the outer surface of the flange (5).

  The sleeve (6) is not limited to one divided into a pair of sleeve divided pieces (6a) (6b), but has a shape corresponding to the pair of sleeve divided pieces (6a) (6b). It may be formed automatically. In this case, the sleeve (6) is made of an elastically deformable synthetic resin and has a cylindrical shape having a vertical slit on the side surface, and an enlarged flange (14) at one end, and both inner side surfaces facing each other. Protrusions (13) are provided to face. Then, while expanding the slit, the sleeve (6) is fitted onto the outer surface of the inner collar (5), and the protrusion (13) is engaged with the desired adjustment hole (11).

  Both sleeve division pieces (6a) and (6b) are fitted on the outer surface of the inner flange (5) so as to abut each other's facing surfaces, and the protrusions (13) and (13) correspond to the adjustment positions. By engaging the desired adjustment holes (11) and (11), the inner flange (5) is fixed so as not to move in the longitudinal direction.

  The left and right directions in which the screws (8) inserted through the locking holes (9) of the outer casing (4) can be fitted into the protrusions (13) and (13) of the sleeve split pieces (6a) and (6b). Engaging holes (15) and (16) facing each other are provided. Of the sleeve split pieces (6a) and (6b), sleeve split pieces that are externally fitted to one side (5a) side of the inner collar (5) (the side that overlaps one side (4a) of the outer collar (4)) The engagement hole (15) provided in the protrusion (13) of 6a) is formed so that the screw (8) can pass therethrough, and is fitted on the other side (5b) side of the inner flange (5). The engagement hole (16) provided in the protrusion (13) of the sleeve split piece (6b) is a screw hole into which the screw (8) passing through the engagement hole (15) can be screwed.

  The sleeve divided pieces (6a) and (6b) are fitted on the outer side surfaces of the inner collar (5), and the protrusions (13) and (13) are arranged in a desired position corresponding to the height adjustment position of the top plate (2). The sleeve split pieces (6a) and (6b) are engaged with the adjustment holes (11) and (11), together with the inner flange (5), from the opening at the upper end of the outer casing (4) into the outer casing (4). Mated. As a result, at the position corresponding to the height adjustment position of the top plate (2), the lower surface of the enlarged diameter flanges (14), (14) of the sleeve split pieces (6a, 6b) is the upper edge of the outer casing (4). And the relative movement of the outer rod (4) and the inner rod (5) in the contraction direction is prevented, and the top plate (2) is held at a desired adjustment position. .

  The state in which the top plate (2) is held at the adjustment position, that is, the state in which the enlarged diameter flanges (14) and (14) of both sleeve split pieces (6a) and (6b) are in contact with the upper edge of the outer casing (4) , The positions of the engagement hole (15) of the sleeve split piece (6a) and the locking hole (9) of the outer casing (4) coincide. In this state, the screw (8) is inserted into the locking hole (9) of the outer casing (4) and penetrated through the engagement hole (15) of the sleeve split piece (6a), so that the sleeve split piece (6b) Screw into the engagement hole (16) and tighten. Thereby, both sleeve division | segmentation piece (6a) (6b) is fixed reliably in an outer casing (4), and inner casing (5) is connected via both sleeve division | segmentation pieces (6a) (6b), It is securely fixed in the outer casing (4) so that it cannot move in the vertical direction.

  After the screw (8) is fastened, the inner collar (5) is fixed to the outer casing (4) as described above. Therefore, when carrying the table (1), even if the top plate (2) is lifted, The inner cage (5) does not come out of the outer cage (4).

  As described above, in the present embodiment, the engagement hole (15) (16) is provided in the protrusion (13) engaged with the adjustment hole (11) of the inner flange (5), and the screw (8) is engaged. Since the holes (15) and (16) are fitted, the protrusion (13) engaged with the adjustment hole (11) can be reinforced by the screw (8), and the protrusion (13) and the adjustment hole (11 ) And the strength can be improved. Further, when the screw (8) is tightened, the tip of the screw (8) does not need to be brought into pressure contact with the outer surface of the inner rod (5), so that the outer surface of the inner rod (5) is not damaged. Furthermore, since it is only necessary to process the adjustment hole (11) in the inner collar (5) and only the locking hole (9) in the outer collar (4), the outer collar (4) and the inner collar (5 ), The cost can be reduced and the appearance can be improved.

  Further, when the screw (8) is fitted into the engagement holes (15) and (16) of the sleeve divided pieces (6a) and (6b), the engagement between the engagement holes (15) and (16) and the outer casing (4). Since the position with the stop hole (9) matches, the screw (8) can be easily fitted into the engagement holes (15) and (16) through the locking hole (9). ) Can be easily and reliably performed.

  Furthermore, with respect to the downward load (leg shrinkage direction) acting between the outer rod (4) and the inner rod (5), the diameter-enlarging flange (14) of the sleeve (6) and the outer rod ( Since the load is not directly applied to the screw (8) directly by contact with the upper edge of 4), the structure can be extremely excellent in strength.

  FIG. 7 shows an enlarged longitudinal sectional view of a main part in another embodiment according to the present invention. The sleeve (17) in this embodiment is formed by half-split sleeve split pieces (17a) and (17b), and on the inner surface of both sleeve split pieces (17a) and (17b), there are two upper and lower sleeves. A protrusion (20) is provided.

  The upper and lower two protrusions (20) are the two upper and lower adjustments adjacent to the top and bottom corresponding to the adjustment position of the top plate (2) among the plurality of adjustment holes (11) provided in the inner collar (5). It is adapted to be engaged with the hole (11). Then, the screw (21) constituting the rod-like fixing means is drilled on the side surface of one sleeve split piece (17a) through the locking hole (22) drilled on the upper side surface of the outer casing (4). By screwing into the screwing hole (23), one sleeve split piece (17a) is fixed in the outer casing (4), and the inner casing (5) is inserted into the outer casing (17) via the sleeve (17). 4) It is designed to be fixed inside. In this other embodiment, the two upper and lower protrusions (20) engage with the adjustment hole (11), which is advantageous in terms of strength. Since other configurations are the same as those of the embodiment shown in FIGS. 1 to 6, the same configurations are denoted by the same reference numerals and detailed description thereof is omitted.

  FIG. 8 shows an enlarged longitudinal sectional view of the main part in still another embodiment according to the present invention. The sleeve (6) in this embodiment is formed by a pair of left and right sleeve split pieces (6a) (6b) similar to the embodiment shown in FIGS. 1 to 6, and the fixing means has a pin (24 ).

  The pin (24) is divided into one sleeve that is fitted on the side surface (5a) side of the inner collar (5) through a locking hole (9) drilled on one side surface of the outer collar (4). The other sleeve split piece (6b) is inserted through the engagement hole (15) provided in the protrusion (13) of the piece (6a) and is fitted on the other side (5b) side of the inner collar (5). It is press-fitted into an engagement hole (25) provided in the protrusion (13). In this embodiment, the pin (24) can be easily fitted into the engagement holes (15) and (25) of the sleeve (6). Since other configurations are the same as those in the embodiment shown in FIGS. 1 to 6, the same configurations are denoted by the same reference numerals and detailed description thereof is omitted.

It is the disassembled perspective view which looked at the table to which one Embodiment of this invention was applied from the front side. Similarly, it is a side view of a table. It is a longitudinal cross-sectional view which follows the III-III line in FIG. It is an expansion disassembled perspective view of the principal part. It is an enlarged view of the V section in FIG. FIG. 4 is a transverse sectional view taken along line IV-IV in FIG. 2. It is an expanded vertical sectional view of the principal part which shows 2nd Example concerning this invention. It is an expanded vertical sectional view of the principal part which shows 3rd Example concerning this invention.

Explanation of symbols

(1) Table
(2) Top plate
(3) Leg
(4) Bund
(4a) One side
(5) Inner pot
(5a) (5b) Side
(6) Sleeve
(6a) (6b) Sleeve split piece
(8) Screw (fixing means)
(9) Locking hole
(10) Caster
(11) Adjustment hole
(12) Side rod
(13) Projection
(14) Expanded flange
(15) Engagement hole
(16) Engagement hole
(17) Slider
(17a) (17b) Slider segment
(20) Projection
(21) Screw (fixing means)
(22) Locking hole
(23) Screw hole
(24) Pin
(25) Engagement hole

Claims (5)

A cylindrical outer casing, an inner casing that is inserted into the outer casing so as to be movable in the longitudinal direction, and has a plurality of adjustment holes formed in the longitudinal direction at predetermined intervals, and the inner casing. A protrusion that can be selectively engaged with the adjustment hole, and a flange having an enlarged diameter at one end, and the protrusion is fitted into a desired adjustment hole and is fitted into the outer flange together with the inner flange. And a sleeve capable of preventing relative movement of the inner flange and the outer casing in the contraction direction, with the diameter-enlarging flange abutting against one end of the outer casing,
A locking hole is formed in the outer surface of the outer casing, and an engagement hole is provided in the sleeve opposite to the locking hole in a state where the diameter-enlarging flange is in contact with one end of the outer casing. The length of the locking hole and the engagement hole is adjustable by inserting rod-like fixing means for fixing the sleeve and the inner collar to the outer casing so as not to move in the longitudinal direction. Telescopic folds.   A plurality of adjustment holes are drilled at predetermined intervals in the longitudinal direction on both outer side surfaces of the inner collar, and the sleeve is externally attached to both outer surfaces of the inner casing by abutting the opposing surfaces. It is formed by a pair of half-divided sleeve division pieces to be fitted, and each of the inner side surfaces of the pair of sleeve division pieces is provided with a protrusion that can be selectively engaged with the adjustment hole. The length-adjustable telescopic fold according to claim 1.   3. The length-adjustable telescopic hook according to claim 1, wherein the engaging hole of the sleeve into which the fixing means is inserted is formed by penetrating a protrusion that engages with the inner hole adjusting hole.   4. The length-adjustable extension rod according to claim 1, wherein the fixing means is a screw that can be screwed into the engagement hole of the sleeve. The length-adjustable telescopic hook according to any one of claims 1 to 3, wherein the fixing means is a pin that can be press-fitted into the engagement hole of the sleeve.

Images