JP2009106625A - Safety device for folding desk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly safe folding desk capable of preventing a user's hand from being caught between a locking device and the upper face of a beam when operating the device. <P>SOLUTION: The folding desk has the locking device provided on the lower surface of a top panel and pivoted at a latch plate member fixed to the upper end of a support. The locking device allows the top panel to turn to a horizontal state to the upper face of the support or to a vertical state to be raised on the back side of the support. The folding desk also has a cover 41 to always cover a prescribed area of the lower surface of the locking device, on the front of the support 3 from the latch plate member, together with the latch plate ember while the top panel turns between the horizontal state and the vertical state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a safety device for a folding desk used in an office room of an office. Here, “folding desk” refers to a table that has a top of a common JIS standard that can be folded by turning it from a horizontal state to a vertical state. The so-called folding table is also included.

  The present applicant has provided a folding table locking device that is safe and free from the risk of pinching a hand during operation (see Patent Document 1). The folding table described in Patent Document 1 is provided with a locking device that rotates and locks the top plate between a horizontal state and a vertical state as shown in FIGS. The stop device is easy to operate, and the operation mechanism is housed in the frame body so that it does not appear outside, so that some safety has been taken. However, there was nothing to cover between the locking device on the lower surface of the rotating top plate and the upper surface of the beam installed between the upper ends of the columns, so there was nothing to cover. The operator may get caught in the gap between the locking device and the upper surface of the beam during the operation of pulling the part and folding the top plate from the vertical state to the horizontal state. , There was a danger of unexpected injury.

Japanese Patent No. 2868755

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an extremely safe folding desk that can solve the above-mentioned conventional problems and does not have a hand between the locking device and the beam upper surface during operation. .

  In order to solve the above-described problem, the invention according to claim 1 is provided with a locking device that allows the top plate to be rotated in a horizontal state with respect to the upper surface of the column and in a vertical state that stands up on the rear side of the column. In the folding desk pivotally supported by the latch plate member fixed to the upper end portion of the support column and provided on the lower surface of the top plate, the support plate is always moved from the latch plate member while the top plate rotates between the horizontal state and the vertical state. A cover body that covers the lower surface of the front locking device together with the latch plate member over a predetermined range is provided.

  According to a second aspect of the present invention, in the first aspect, the cover body has a concave protector having a predetermined size, one end of the protector pivots on the upper end of the support, and the other end is locked. The protector is slidably engaged with the protector rails provided on both sides of the device, and the protector slides on the protector rail with its one end as a fulcrum while the top plate rotates between the horizontal and vertical states. It is made to move and to rotate in conjunction with a top plate.

  The invention according to claim 3 is characterized in that, in claim 2, one end of the protector is pivotally supported by a cross-sectional square beam attached to the upper end of the support column. According to a fourth aspect of the present invention, in the second or third aspect, an engagement roller is rotatably provided at the other end portion of the protector, and the engagement roller is slidable in a concave groove formed in the protector rail. It is characterized by matching. According to a fifth aspect of the present invention, in the third or fourth aspect, the protector has a main body having a substantially U-shaped cross section that is formed of a bottom wall and both side walls and is open on a side facing the top plate lower surface. Engagement rollers are provided opposite to the inner surface of the wall, and the opening side edge portions of both side walls are positioned close to the lower surface of the top plate when the top plate is in a horizontal state. And a second edge portion that is positioned close to the upper surface of the beam when the top plate is in a vertical state.

  The present invention is as described above, and in the folding desk, while the top plate rotates between the horizontal state and the vertical state, the lower surface of the locking device on the front side of the support column from the latch plate member is always latched over a predetermined range. Since the cover member that covers the plate member is provided, there have been many accidents in which the hand is injured in the past when folded, but such an accident can be eliminated, so that the safety is extremely high. In addition, there is no hindrance to the rotation of the top plate, and the conventional folding action can be expected. In addition, the appearance is unique, the configuration is simple, and the production cost is also reduced. Can be expected and an excellent effect of being economical.

  An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an overall side view of a folding desk, FIG. 2A is a cross-sectional view of a main part cut at a portion with a locking device, and FIG. 1B is an enlarged view of a portion surrounded by a dashed line in FIG. 3 is a perspective view of the main part with the top plate removed from FIG. 2A, FIG. 4 is an enlarged sectional view taken along line AA in FIG. 3, FIG. 5 is a perspective view of the latch plate member, and FIG. It is a drawing.

  Reference numeral 1 denotes a top plate constituting a folding desk. A frame body 2 having a substantially U-shaped cross section constituting a locking device A is formed on both sides of the lower surface of the top plate so that the upper opening side faces the top plate 1 in the front-rear direction. It is fixed facing. Reference numeral 3 denotes a vertical support column, and four leg rods 5 having casters 4 are provided at a lower portion in a radial direction and around the support column 3 at equal intervals.

  A square beam 6 having a square cross section is disposed horizontally at the upper end of the column 3. A locking device A is installed on the beam 6. That is, a latch plate member 7 having a shape as shown in FIG. 5 is fixed on the beam 6, and the latch plate member 7 is fitted to the frame body 2 of the locking device A from its lower opening. The latch plate member 7 and the frame body 2 are pivotally supported by a rotation shaft 8 penetrating them in the left-right direction. As a result, the top plate 1 is in a horizontal state (use state) where the top plate 1 lies near the upper end of the support column 3 as shown in FIGS. It is rotated to a vertical state (non-use state) standing on the rear side.

  Reference numeral 10 denotes a connecting shaft that is turned in the left-right direction on the lower surface of the top plate 1 and is rotatably installed between the frame bodies 2 and 2. The connecting shaft 10 appears between the frame bodies 2 and 2 in the present embodiment. However, the connecting shaft 10 may be stored in a storage frame (not shown) so as not to appear outside. A pinion 12 is attached to the end of each of the frame bodies 2, 2 of the connecting shaft 10. In FIG. 4, reference numeral 15 denotes a slide member having a substantially U-shaped cross section that is slidably housed in each frame body 2, 2, and a rack 16 that meshes with the pinion 12 is provided on the inner surface on the front end side. When the slide member 15 is slid, the pinion 12 meshing with the rack 16 rotates, and this rotational force is transmitted to the other side pinion 12 and the rack 16 via the connecting shaft 10, and the other side slide member 15 is also slid simultaneously. It is supposed to let you. Reference numeral 17 denotes a stopper portion formed on the lower surface of the front side of the slide member 15, which is locked to the front end edge 18 of each frame body 2, 2 when the slide member 15 is urged rearward by a tension spring described later. . Reference numeral 19 denotes an operation handle provided in a recessed manner so that a finger can be easily hooked on the lower surface of the slide member 15 on the front side of the stopper portion 17. Reference numeral 20 denotes a connecting rod for connecting the left and right frame bodies 2, 2, and is disposed before and after the frame bodies 2, 2.

  At a position near the latch plate member 7 of the slide member 15, a locking pin 21 and a locking pin 22 are provided penetrating both side walls at intervals in the front-rear direction. A long hole 24 and a long hole 25 for movably engaging the locking pin 21 and the locking pin 22 are provided laterally on both side walls of the frame bodies 2 and 2. Further, an elongated hole 26 that is engaged with the rotary shaft 8 is provided in a lateral direction at an intermediate position between the locking pin 21 and the locking pin 22 on both side walls of the slide member 15. Reference numeral 28 denotes a tension spring, one end of which engages with the locking pin 22 and the other end engages with and attaches to the rear end of each frame body 2, 2. The locking pin 21 and the locking pin 22 are always engaged with the rear end portions of the long hole 24 and the long hole 25, respectively, and the stopper portion 17 is locked with the front end edge 18 of each frame body 2, 2. It has come to be energized.

  Reference numeral 31 denotes a locking groove formed on the front side of both side walls of the latch plate member 7. The locking pin 21 and the locking pin 22 of the slide member 15 that receive the urging force of the tension spring 28 when the top plate 1 is in a horizontal state. Are engaged with the rear end portions of the long hole 24 and the long hole 25, respectively, so that the locking pin 21 is locked. Reference numeral 32 denotes a locking groove formed on the rear side of the outer side wall of the latch plate member 7, which locks with the locking pin 21 of the slide member 15 that receives the urging force of the tension spring 28 when the top plate 1 is in a vertical state. The locking pins 22 are locked when the pins 22 are engaged with the rear ends of the long holes 24 and 25, respectively. Reference numeral 34 denotes a taper portion formed in a notch at the upper edge portion of the latch plate member 7 near the locking groove 31 near the locking groove 31. The taper portion 21 is rotated to turn the top plate 1 from the vertical state to the horizontal state. When the lock pin is locked to the lock groove 31, the lock pin 21 is brought into contact with and slides to guide the lock groove 31. Reference numeral 35 denotes a tapered portion formed in a side edge portion of the outer side wall of the latch plate member 7 near the locking groove 32. The taper portion 35 is rotated so as to turn the top plate 1 from the horizontal state to the vertical state. When locking 22 to the locking groove 32, the locking pin 22 contacts and slides to guide the locking groove 32.

  41 is a protector which is a cover body, and the whole has a concave shape as shown in FIG. That is, the protector 41 has a main body 42 having a substantially U-shaped cross section composed of a bottom wall 42a and both side walls 42b, and an attaching pivotal support part 42c is provided at one end of the main body. An engaging roller 42d is rotatably attached to the opposing inner surface of the other end side wall 42b of the main body. On the other hand, a mounting base portion 43 on which the pivotal support portion 42c of the protector 41 is pivotally fixed is fixed to the side surface on the operation side of the beam 6, and on both side walls of the frame bodies 2 and 2 around the beam 6. The protect rails 44, 44 are fixed, and concave grooves 45, 45 are formed on the outer surfaces of the rails so that the engaging rollers 42d of the protector 41 are engaged in a freely rotatable manner. In FIG. 6, 46 and 47 are reinforcing ribs.

  When the protector 41 having the above-described configuration is attached by pivotally supporting the pivot portion 42c to the attachment base portion 43 and engaging the engagement rollers 42d with the concave grooves 45, 45 of the protect rails 44, 44, the top plate 1 is attached. In conjunction with this pivoting operation, the protector 41 is similarly pivoted about the pivotal portion 42c as the engaging roller 42d slides in the concave grooves 45, 45. At this time, the side walls 42b of the protector 41 are in contact with the upper surface of the beam 6 and the lower surface of the top plate 1 so that the rotation is not hindered. The first edge portion 42b 'on the side of the engaging roller 42d that becomes a position approaching the lower surface of the top plate when it becomes, and a pivot that becomes a position close to the upper surface of the beam 6 when the top plate 1 becomes vertical. A second edge 42b "on the side of the support 42c is formed (see FIG. 6).

  As described above, the four leg rods 5 having the casters 4 are provided in the lower part of the column 3, and these leg rods 5 are two leg rods facing each other with the column 3 interposed therebetween as shown in FIG. 5a and two opposing leg rods 5b different from each other are provided at different heights. Further, the two leg rods 5a having a high height are longer than the two leg rods 5b having a low height. That is, the height and length are set to such an extent that the upper sides of the two lower leg rods 5b are slightly lower than the lower sides of the two upper leg rods 5a. Thus, when stacking a plurality of folding desks with the top plate 1 in a vertical state when not in use, as shown in the figure, the desk leg rod 5b to be stacked is stacked between the two leg rods 5a and 5b of the desk to be stacked. By inserting, stacking becomes possible easily. Therefore, stacking can be easily performed in a shorter time than in the past.

  Next, the operation of this embodiment will be described. 1 and 2, in order to fold the top plate 1 in the horizontal use state and to make it non-use in the vertical state, as shown by the arrows, pull one of the slide members 15 on the left and right on the handle portion 19 and pull it. Slide it forward against the biasing force of the spring 28. Then, as shown by a one-dot chain line in FIG. 7, the stopper portion 17 is separated from the front end edge 18 of each frame body 2, 2, and the locking pin 21 and the locking pin 22 are the rear end of the long hole 24 and the long hole 25, respectively. The engaging pin 21 is disengaged from the engaging groove 31 while engaging the front end portion from the portion. After the locking pin 21 is removed from the locking groove 31, when the front portion of the top plate 1 is lifted and rotated upward while maintaining the sliding state, the top plate 1 rotates about the rotation shaft 8 as a fulcrum. The locking pin 21 moves along the trajectory of the taper 34 through the upper portion of the tapered portion 34. When the sliding state is released after the locking pin 21 passes above the tapered portion 34, the sliding member 15 receives the urging force of the tension spring 28 again, and the stopper portion 17 is engaged with the front end edge 18 of each frame body 2,2. As a result, the locking pin 21 and the locking pin 22 are engaged with the rear ends of the long hole 24 and the long hole 25, respectively.

  As shown in FIG. 7, the top plate 1 changes from the horizontal state to the inclined state, and from the inclined state to the vertical state standing on the rear side of the support column 3 as indicated by the solid line. The pin 22 is locked in the locking groove 32, and this vertical state is maintained. When the locking pin 22 comes into contact with the tapered portion 35 and is guided to slide on the tapered portion and locked in the locking groove 32 when the state is close to the vertical, the locking is not performed. Very smooth. At this time, since the outer edge of the long hole 25 is formed in a curved shape protruding slightly outward, the locking pin 22 smoothly enters the locking groove 32 from the tapered portion 35.

  In the above description, when the top plate 1 is in the horizontal state, the protector 41 is located at the position where the second edge portion on the engagement roller 42d side of the opening side edge portions of the side walls 42b approaches the bottom surface of the top plate as shown in FIG. Thus, the lower surface of the locking device A on the front side of the support column 3 with respect to the latch plate member 7 is covered with the latch plate member 7 and its bottom wall 42a and both side walls 42b over a predetermined range. When the top plate 1 rotates upward, the protector 41 also rotates in conjunction with the pivot portion 42c as a fulcrum. At this time, the engaging roller 42d moves along the concave grooves 45, 45 of the protect rails 44, 44. Slide backwards. When the top plate 1 is in the vertical state, the protector 41 has the second edge 42b "on the side of the pivotal support 42c of the opening side edge of the side walls 42b approaching the upper surface of the beam 6 as shown in FIGS. At this time, the lower surface of the locking device A on the front side of the support column 3 with respect to the latch plate member 7 is also covered with the bottom wall 42a and both side walls 42b together with the latch plate member 7 over a predetermined range.

  In order to change from the non-use state of FIG. 7 to the use state of FIGS. 1 and 2 again, first, either one of the left and right slide members 15 is hooked on the handle portion 19 and the tension spring 28 is energized. Slide it forward. Thereby, the stopper portion 17 is separated from the front end edge 18 of each frame body 2, 2, and the locking pin 21 and the locking pin 22 are engaged with the front end portion from the rear end portion of the long hole 24 and the long hole 25, respectively. At the same time, since the locking pin 22 is detached from the locking groove 32, after the locking pin 22 is removed from the locking groove 32, the top plate 1 facing upward while maintaining the sliding state is retained. Turn the front part down and turn it down. Then, the top plate 1 rotates in the direction opposite to the above with the rotation shaft 8 as a fulcrum, and the locking pin 22 moves along the rotation locus above the taper portion 35. Then, the top plate 1 changes from the vertical state to the inclined state, and further from the inclined state to the horizontal state near the upper surface of the support column 3. In this horizontal state, the locking pin 21 is locked to the locking groove 31, and this horizontal state is maintained. Is done. Even in this nearly horizontal state, the locking pin 21 once comes into contact with the tapered portion 34 and is guided by the tapered portion to be locked in the locking groove 31, so that the locking is very smooth. Also in the above, when the sliding state is released after the locking pin 22 passes over the tapered portion 35, the sliding member 15 receives the urging force of the tension spring 28 again, and the stopper portion 17 has the front edge of each frame body 2,2. 18, the locking pin 21 and the locking pin 22 are engaged with the rear end portions of the long hole 24 and the long hole 25, respectively.

  At this time, when the top plate 1 rotates downward, the protector 41 rotates in conjunction with the pivot portion 42c as a fulcrum, and the engagement roller 42d moves along the concave grooves 45, 45 of the protect rails 44, 44. It slides forward on the opposite side. Then, when the top plate 1 is in a horizontal state, the first edge portion 42b 'on the side of the engagement roller 42d of the opening side edge portions of the both side walls 42b of the protector 41 is positioned close to the bottom surface of the top plate, Again, the lower surface of the locking device A on the front side of the support column 3 from the latch plate member 7 is covered by the bottom wall 42a and both side walls 42b together with the latch plate member 7 over a predetermined range. Therefore, the operator does not get caught between the lower surface of the locking device A and the upper surface of the beam 6 during the rotation of the top plate 1 downward, which is extremely safe.

  As described above, while the protector 41 is rotated between the horizontal state and the vertical state as shown in FIG. 7, the lower surface of the locking device A always on the front side of the support column 3 from the latch plate member 7. Is covered with the latch plate member 7 over a predetermined range, so that there is no possibility of unexpected injuries with a hand sandwiched as in the prior art.

  Note that this embodiment is merely a preferred example, and the specific shape and structure of the protector 41 can be arbitrarily modified and changed within the scope of the claims in practice. is there. Further, in this embodiment, a horizontal beam 6 is attached to the upper end of the column 3 and the latch plate member 7 is fixed to the beam. However, the latch plate member 7 is directly fixed to the upper end of the column 3 without the beam 6. May be. Furthermore, in the present embodiment, two locking devices are provided, one on each side of the lower surface of the top plate 1, but this configuration is not necessarily required. It may be provided individually.

It is a whole side view showing the folding desk of one embodiment of this invention. (A) is principal part sectional drawing cut | disconnected by the part with a locking device, (B) is an enlarged view of the part enclosed with the dashed-dotted line of (A). It is the principal part perspective view which removed the top plate from FIG. 2 (A). FIG. 4 is an enlarged sectional view taken along line AA in FIG. 3. It is a perspective view of a latch plate member. A protector is shown, (A) is the front view, (B) is a top view, (C) is a side view, (D) is sectional drawing which follows the line DD of (B). It is a partially broken side view for operation explanation. It is a principal part perspective view which shows the state rotated from the horizontal state of FIG. 3 to the vertical state. It is a whole perspective view of the folding desk with the top plate in a vertical state.

Explanation of symbols

A Locking device 1 Top plate 2 Frame body 3 Post 6 Beam 7 Latch plate member 8 Rotating shaft
10 Connecting shaft
41 Protector (Cover body)
42 body
42a Bottom wall
42b Side wall
42c Pivot
42d engagement roller
43 Mounting base
44 Protect rail
45 groove

Claims (5)

A locking device that allows the top plate to rotate in a horizontal state with respect to the upper surface of the column and a vertical state standing on the rear side of the column is pivotally supported by a latch plate member fixed to the upper end of the column. In the folding desk provided on the bottom of the plate,
While the top plate rotates between the horizontal state and the vertical state, a cover body is provided that covers the lower surface of the locking device that is on the front side of the support column from the latch plate member together with the latch plate member over a predetermined range. Folding desk safety device.   The cover body has a concave protector of a predetermined size, one end of this protector is pivotally supported by the upper end of the column, and the other end is slidable with a protector rail provided on both side surfaces of the locking device. Engage and rotate the top plate in the horizontal and vertical states while the protector rotates on the protector rail with the other end sliding on the protector rail. The safety device for a folding desk according to claim 1.   The safety device for a folding desk according to claim 2, wherein one end of the protector is pivotally supported by a square beam having a cross section attached to the upper end of the support column.   4. The folding desk safety device according to claim 2, wherein an engaging roller is rotatably provided at the other end of the protector, and the engaging roller is slidably engaged with a concave groove formed in the protector rail. .   The protector has a main body having a substantially U-shaped cross-section, which is composed of a bottom wall and both side walls and is open on the side facing the bottom surface of the top plate. The opening side edge of both side walls is positioned on the upper surface of the beam when the top plate is in a vertical state and the first edge portion that is close to the bottom surface of the top plate when the top plate is in a horizontal state. The safety device for a folding desk according to claim 3 or 4, wherein the safety device is formed on a second edge portion that is in an approached position.

Images