JP4529622B2 - Horizontal blind ladder clamp - Google Patents

Description

  The present invention relates to a ladder clamp that is externally fitted to a winding drum of a horizontal blind and supports a ladder cord or a ladder tape.

  An upper end portion of a ladder cord or a ladder tape that suspends a slat row of a horizontal blind is attached to a ladder clamp that is slipably fitted to a take-up drum or a tilt drum that rotates integrally with a rotation shaft in the head box. A ladder clamp is formed of front and rear arcuate plate portions that are connected to each other through pins at the front and rear centers, and a protrusion extending in the circumferential direction is provided on the outer peripheral surface, and a ladder cord or It is well known to provide a locking groove for locking the front side and the rear upper end of the ladder tape.

When the ladder clamp is externally fitted to the tilt drum, when the annular groove is formed on the outer peripheral surface of the tilt drum and the ladder clamp is fitted into the annular groove, the position of the ladder clamp in the left-right direction is defined. However, when the ladder clamp is externally fitted to the winding drum, an annular groove cannot be formed, and therefore the position of the ladder clamp in the left-right direction is not specified. As a result, when a lateral force is applied to the ladder cord or ladder tape, the position of the ladder clamp moves to the left and right together with the ladder cord or ladder tape. There is.
Japanese Utility Model Publication 524796 Japanese Patent Laid-Open No. 2004-238821

  The present invention has been made in order to solve the above-mentioned problems, and the problem is that the position of the ladder clamp that is slip-fitted to the winding drum of the horizontal blind and supports the ladder cord or the ladder tape is determined. It is to prescribe.

  In order to achieve the above-described object, the present invention provides a ladder clamp that is slippedly fitted to a take-up drum supported by a drum holder of a horizontal blind and supports a ladder cord or a ladder tape. The ladder clamp is formed of front and rear arcuate plate portions that are connected to each other via pins extending in the left and right direction in the center in the front-rear direction, and the ladder clamps are formed on the outer peripheral surfaces of the front and rear arcuate plate portions. Provide front and rear locking projections with front and rear locking grooves for locking the front and rear upper ends of the cord or ladder tape, respectively, and engage with the external thread on the outer peripheral surface of the winding drum on the inner peripheral surface An internal thread is provided.

  In the ladder clamp of the present invention, when the front and rear arc-shaped plate portions connected at the center in the front-rear direction are opened and fitted onto the take-up drum, the female threads on the inner peripheral surfaces of the front and rear arc-shaped plate portions are wound up. Automatically fits into the external thread on the drum outer surface. The ladder clamp is defined in the left-right direction position because the female screw on the inner peripheral surface engages with the male screw on the outer peripheral surface of the winding drum. Therefore, even if an external force in the left-right direction acts on the ladder cord or the ladder tape, the ladder clamp does not move to the left or right. Therefore, when the external force leaves, the ladder cord or the ladder tape automatically returns to the original position. Thereby, the position of the ladder code or the ladder tape in the left-right direction is always stable.

  As the take-up drum rotates, the ladder clamp first rotates with the take-up drum, raising one of the front and rear of the ladder cord or ladder tape and lowering the other, so that the slats tilt forward or backward. When the slat approaches the forward tilt limit, the ladder clamp opens and the front arcuate plate part slips off the take-up drum, and conversely, when the slat approaches the rearward tilt limit, the ladder clamp opens and the rear arc shape Since the plate portion slips out of the winding drum, the slat does not tilt beyond the limit.

  In order to make the distance between the top and bottom of the ladder cord or ladder tape that hangs down from the head box as narrow as possible, the front and rear arcuate plates are provided with slits that extend from the bottom of the locking projection in the circumferential direction to the lower edge. It is preferable to pass the upper end portion of the ladder cord or the ladder tape through the slit and hang down in contact with the winding drum.

  It is preferable to provide two guide protrusions that surround the upper part of the slit from the left and right and extend to the vicinity of the locking protrusion, and guide the upper end of the ladder cord or ladder tape to the slit by the guide protrusion. The female thread formed on the ladder clamp can be 2 to 4 pitches.

  The present invention will be described based on embodiments shown in the drawings. 1 is a partially cutaway front view showing a main part of a horizontal blind provided with an embodiment of the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, FIG. 3 is an elevation view of a ladder clamp, and FIG. FIG. 5 is a side view of the clamp, FIG. 5 is a rear view of the front arcuate plate portion, and FIG. 6 is a front view of the rear arcuate plate portion.

  As shown in FIGS. 1 and 2, in a horizontal blind headbox 1, a take-up drum 3 rotates integrally with a rotary shaft 2 of a square axis, but is slidably attached in the axial direction. The winding drum 3 passes through the sleeve 4, and the male screw M on the outer peripheral surface of the winding drum 3 engages with the female screw on the inner peripheral surface of the sleeve 4. The sleeve 4 is integral with a drum holder 5 fixed to the head box 1.

  The lifting / lowering cord 6 is fixed to the winding drum 3 at the upper end, hangs down from the head box 1 via the lifting / lowering cord slack detection mechanism 7 built in the drum holder 5, and then passes through the slats 8 aligned vertically. The lower end is fixed to the bottom rail 9. In FIG. 1, when the rotary shaft 2 rotates in the direction of the arrow, the winding drum 3 moves to the right while rotating and winds the lifting cord 6, so that the bottom rail 9 rises. When the rotating shaft 2 rotates in the opposite direction, the winding drum 3 moves to the left while rotating and unwinds the lifting / lowering cord 6, so that the bottom rail 9 is lowered.

  An open annular ladder clamp 10 larger than a semicircle is fitted on the winding drum 3. The ladder clamp 10 is formed of front and rear arcuate plate portions 12a and 12b that are connected to each other via a pin 11 extending in the left and right direction in the center in the front-rear direction. As shown in FIGS. 3 and 4, a front locking protrusion 14 a having a front locking groove 13 a is integrally formed on the outer peripheral surface of the front arcuate plate portion 12 a of the ladder clamp 10. A front slit 15a extending to the edge and two front guide protrusions 16a extending downward from near the front locking protrusion 14a and surrounding the upper part of the front slit 15a from the left and right are formed. Similarly, a rear side locking projection 14b having a rear side locking groove 13b is integrally formed on the upper part of the outer peripheral surface of the rear side arcuate plate part 12b, and below that, a rear side slit 15b extending to the lower edge, Two rear guide protrusions 16b are formed which extend downward from near the rear locking protrusions 14b and surround the upper part of the rear slit 15b from the left and right.

  A female screw F that engages with a male screw M on the outer peripheral surface of the winding drum is provided on the inner peripheral surfaces of the front and rear arcuate plate portions 12a and 12b. As shown in FIGS. 5 and 6, the female screw F has a pitch of 2 to 4 and is formed on the inner peripheral surface on the left side of the slits 15a15b of the front and rear arcuate plate portions 12a and 12b. In FIG. 1, the left side of the front and rear arcuate plate portions 12 a and 12 b where the female screw F is formed is the side where the ladder clamp 10 is close to the sleeve 4.

  As shown in FIG. 2, the front upper end portion 17a of the ladder cord 17 is fixed to the front locking protrusion 14a via the front locking groove 13a of the ladder clamp 10, and then guided to the front guide protrusion 16a to the front side. It passes through the slit 15 a and then enters the front cord outlet of the drum holder 5 while contacting the front surface of the winding drum 3. The rear upper end 17b is fixed to the rear locking projection 14b via the rear locking groove 13b of the ladder clamp 10, and then guided by the rear guiding projection 16b and passes through the rear slit 15b. Then, it enters the rear cord outlet of the drum holder 5 while contacting the rear surface of the winding drum 3.

  When the front and rear upper end portions 17a and 17b pass through the front and rear cord outlets of the drum holder 5, they are connected in a ladder shape to form one ladder cord 17, which hangs down from the head box 1 and supports each slat 8. To do. When the rotating shaft 2 rotates in the direction of the arrow in FIG. 1, the ladder clamp 10 first rotates together with the winding drum 3, and the front upper end portion 17 a of the ladder cord 17 is lowered and the rear upper end portion 17 b is raised. Lean forward. When the slat 8 approaches the forward tilt limit, the ladder clamp 10 opens and the front arcuate plate portion 12a slips off the take-up drum, so the slat 8 does not tilt any further. When the rotating shaft 2 rotates in the opposite direction, the ladder clamp 10 first rotates together with the take-up drum 3 and raises the front upper end 17a of the ladder cord 17 and lowers the rear upper end 17b, so that the slat 8 tilts backward. . When the slat 8 approaches the rearward tilt limit, the ladder clamp 10 opens and the rear arcuate plate portion 12b slips off the take-up drum, so that the slat 8 does not tilt further.

  When the ladder clamp 10 opens the front and rear arcuate plates 12a and 12b and externally fits to the take-up drum 3, the female screw F on the inner peripheral surface of the front and rear arcuate plates 12a and 12b is taken up by the take-up drum. 3, the position of the ladder clamp 10 in the left-right direction is defined, and the position of the ladder cord in the left-right direction is also stable. Even if the ladder cord 17 is displaced from side to side due to an external force acting on the ladder cord 17, the ladder clamp 10 does not move to the left or right. Therefore, when the external force disappears, the ladder cord 17 automatically returns to its original position.

Partially cutaway front view showing the main part of a horizontal blind comprising an embodiment of the present invention, II-II line arrow view of FIG. Elevated view of rudder clamp, Side view of rudder clamp, Rear view of the front arcuate plate, The front view of a back side arcuate board part.

Explanation of symbols

1: Head box 2: Rotating shaft 3: Winding drum 4: Ladder tape 5: Sleeve 6: Lifting cord 7: Lifting cord slack detection mechanism 8: Slat 9: Bottom rail 10: Ladder clamp 11: Pin 12a: Front arc shape Plate part, 12b: Rear arcuate plate part 13a: Front locking groove, 13b: Rear locking groove 14a: Front locking protrusion, 14b: Rear locking protrusion 15a: Front slit, 15b: Rear slit 16a : Front guide protrusion, 16b: Rear guide protrusion 17: Ladder cord roll, 17a: Front upper end, 17b: Rear upper end F: Female thread M: Male screw

Claims (6)

A ladder clamp that is slidably fitted onto a winding drum supported by a drum holder of a horizontal blind and supports a ladder cord or a ladder tape, and the winding drum moves to the left and right while rotating to Winding or unwinding, the ladder clamp is an open ring larger than a semicircle, and is connected to the front and rear arcuate plate portions that are connected to each other via pins extending in the left-right direction at the center in the front-rear direction. The front and rear arcuate plate portions are provided with front and rear locking projections for locking the front and rear upper ends of the ladder cord or ladder tape on the outer peripheral surface, and the winding is wound on the inner peripheral surface. A ladder blind clamp for a horizontal blind, characterized by comprising a female thread that engages with a male thread on the outer peripheral surface of the drum.   The ladder clamp for a horizontal blind according to claim 1, wherein each of the front side and rear side locking projections has a locking groove. The horizontal blind ladder clamp according to claim 1 or 2, wherein the front and rear arcuate plate portions are provided with slits extending in the circumferential direction from below the locking projections and coming out to the lower edge.   The horizontal blind ladder clamp according to claim 3, wherein the front and rear arcuate plate portions are provided with two guide protrusions extending from the vicinity of the locking protrusion and surrounding the upper portion of the slit from the left and right.   5. The ladder clamp for a horizontal blind according to claim 3, wherein the female screw is formed on a left side or a right side of the slit. The ladder clamp for a horizontal blind according to any one of claims 1 to 5, wherein the female screw is formed for 2 to 4 pitches.

Images