An elevator light curtain with adjustable monitoring range and adjustment method thereof

Abstract

The present invention discloses an elevator light curtain with adjustable monitoring range, comprising a mounting plate and an elevator body, wherein an adjustment component is arranged on the side of the mounting plate, wherein the adjustment component comprises a slide groove, wherein the slide groove is arranged inside the elevator body, and a cleaning component is arranged on the outer sides of the mounting plate, the light curtain body and the transmitter and receiver. The present invention relates to the technical field of elevator light curtains; the elevator light curtain with adjustable monitoring range and an adjustment method thereof, wherein the mounting plate is pulled with the assistance of an auxiliary ring, and the tension exerted on the mounting plate is transmitted to a slider and to an internal clamping block, and the clamping block is squeezed to shrink inwardly, and a spring shrinks at the same time, and after the clamping block shrinks from the inside of the clamping groove, the slider is no longer restricted and can slide up and down in the slide groove, thereby realizing the arbitrary adjustment of the position of the slider and the mounting plate, thereby realizing the adjustment of the position of the light curtain body, and realizing the adjustment of the monitoring range.

Description

Technical Field

[0001] The invention relates to the technical field of elevator light curtains, in particular to an elevator light curtain with adjustable monitoring range and an adjustment method thereof. Background Art

[0002] The elevator light curtain is a light-type elevator door safety protection device, which is mainly used to ensure the safety of passengers when using the elevator. It consists of four parts: infrared transmitters and receivers installed on both sides of the elevator car door, a power box installed on the top of the car (some products have omitted the power box for environmental protection and energy saving considerations) and a special flexible cable. The working principle of the light curtain is that multiple infrared emitting tubes in the infrared transmitter are activated in sequence under the control of the micro control unit (MCU), and the elevator door area is continuously scanned from top to bottom to form a dense and uniform infrared protection light curtain.

[0003] The existing elevator light curtain is generally fixed in position. When the elevator light curtain is damaged, it is very inconvenient to disassemble it. In addition, due to the fixed position of the elevator light curtain, its detection range is located near the location of the light curtain device, and the position of the elevator light curtain cannot be adjusted, resulting in the inability to adjust the monitoring range of the light curtain when in use.

[0004] To this end, the present invention provides an elevator light curtain with adjustable monitoring range and an adjustment method thereof to solve the above problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an elevator light curtain with adjustable monitoring range and an adjustment method thereof, which solves the above problems.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an elevator light curtain with adjustable monitoring range, comprising a mounting plate and an elevator body, an adjusting component is arranged on the side of the mounting plate, the adjusting component comprises a slide groove, the slide groove is arranged inside the elevator body, a slider is slidably connected inside the slide groove, the mounting plate is fixedly mounted on the outer side of the slider, an internal hole is arranged inside the slider, a partition is fixedly mounted inside the internal hole, springs are fixedly mounted on both sides of the partition, blocks are fixedly mounted on the outer ends of the springs, the blocks are slidably connected inside the internal hole, slots are arranged on both side walls of the slide groove, the blocks are plugged into the corresponding slots, mounting components are arranged on the side of the mounting plate, a light curtain body is arranged between the mounting components, a transmitter and receiver are fixedly mounted on the side of the light curtain body, and a cleaning component is arranged on the outer sides of the mounting plate, the light curtain body and the transmitter and receiver.

[0007] Preferably, the outer end of the clamping block is arc-shaped, the inner side of the clamping slot is arc-shaped, the clamping block is completely inserted into the clamping slot, and clamping slots are evenly provided on the left and right sides of the slide slot.

[0008] Preferably, the mounting assembly comprises mounting blocks, the mounting blocks are fixedly mounted on upper and lower sides of the side of the mounting plate, the light curtain body is inserted between the upper and lower mounting blocks, and auxiliary rings are fixedly mounted on the upper and lower sides of the mounting plate.

[0009] Preferably: an internal groove is provided inside the mounting block, a moving block is slidably connected inside the internal groove, two plug-in blocks are fixedly installed on the bottom of the moving block, slots are provided on the upper and lower sides of the light curtain body, and the plug-in blocks penetrate the bottom wall of the mounting block and are plugged into the corresponding slots.

[0010] Preferably: the mounting block is internally rotatably connected with a rotating rod, the inner end of the rotating rod is fixedly mounted with a screw rod, the inner end of the screw rod is rotatably connected to the inner wall of the internal groove, the screw rod is threadedly connected to the inside of the moving block, and the outer end of the rotating rod is fixedly mounted with a knob.

[0011] Preferably: the cleaning assembly includes a side groove, the side groove is opened on both sides of the mounting plate, the inside of the side groove is slidably connected with a side block, the outer side of the side block is fixedly installed with a side plate, a slide plate is fixedly installed between the two side plates, a cleaning brush is fixedly installed on the inner side of the slide plate, and the cleaning brush is attached to the light curtain body and the front side of the transmitter and receiver.

[0012] Preferably, an iron sheet is fixedly mounted on the inner bottom wall of the side groove, and the side block is a magnet block, and the side block is adsorbed on the iron sheet.

[0013] Preferably: the transmitter-receiver on the left is the transmitting end of the light curtain, and the transmitter-receiver on the right is the receiving end of the light curtain, and the transmitter-receiver positions on the left and right sides correspond one to one.

[0014] The adjustment method of the elevator light curtain includes the following steps:

[0015] Step 1: When adjusting the position of the mounting plate and the light curtain body, pull the auxiliary rings on the upper and lower sides, and the block is squeezed into the inner hole. The block moves out of the slot, and the slider can slide up and down in the slot to adjust the position of the slider, thereby adjusting the position of the mounting plate and the light curtain body;

[0016] Step 2: After the position is adjusted, the spring takes away the card block and resets it. The card block is reinserted into the corresponding card slot to re-fix the mounting plate and the light curtain body, achieving convenient adjustment and automatic fixing after adjustment;

[0017] Step 3: By rotating the screw rod to drive the moving block and the insert block to move, the insert block can be moved out of the slot to release the fixation of the light curtain body, and the light curtain body can be disassembled, so that the light curtain body can be easily replaced. Beneficial Effects

[0018] The present invention provides an elevator light curtain with adjustable monitoring range and an adjustment method thereof. Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The elevator light curtain with adjustable monitoring range and the adjustment method thereof, the auxiliary ring assists in pulling the mounting plate, the pulling force on the mounting plate is transmitted to the slider and to the internal card block, the card block is squeezed and shrinks inwards, and the spring shrinks at the same time. After the card block shrinks from the inside of the card slot, the slider is no longer restricted and can slide up and down in the slide slot, thereby realizing the arbitrary adjustment of the position of the slider and the mounting plate, thereby realizing the adjustment of the position of the light curtain body, and realizing the adjustment of the monitoring range.

[0020] 2. The elevator light curtain with adjustable monitoring range and the adjustment method thereof, by turning the knob to drive the rotating rod to rotate, the rotating rod rotation can drive the internal screw to rotate, the screw rotation can drive the internal moving block to move, the movement of the moving block can drive the lower plug-in block to move, by moving the plug-in block and removing it from the inside of the slot, the fixation of the plug-in block to the light curtain body can be released, and the light curtain body can be removed, thereby realizing the effect of convenient disassembly and replacement of the light curtain body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 It is a three-dimensional diagram of the external structure of the present invention;

[0023] Figure 2 It is a left-side overall structural stereogram of the present invention;

[0024] Figure 3 It is a disassembled stereogram of the overall structure of the present invention;

[0025] Figure 4 is a cross-sectional view of the internal structure of the elevator body of the present invention;

[0026] Figure 5 The present invention Figure 4 A magnified view of the structure at center;

[0027] Figure 6 It is a three-dimensional diagram of the disassembled structure of the cleaning component of the present invention;

[0028] Figure 7 It is a partial structural stereogram of the present invention;

[0029] Figure 8 The present invention Figure 7 A magnified view of the structure at B in the middle;

[0030] Fig. 9 It is a cross-sectional view of the internal structure of a part of the structure of the present invention;

[0031] Fig.10 The present invention Fig. 9 Enlarged view of the structure at point C in the middle.

[0032] In the figure: 1. mounting plate; 2. adjustment assembly; 21. slide groove; 22. card slot; 23. slider; 24. card block; 25. spring; 26. internal hole; 27. partition; 3. mounting assembly; 31. mounting block; 32. knob; 33. rotating rod; 34. internal groove; 35. screw; 36. moving block; 37. plug-in block; 38. slot; 4. cleaning assembly; 41. side groove; 42. side block; 43. side plate; 44. slide plate; 45. cleaning brush; 5. elevator body; 6. light curtain body; 7. transmitter and receiver; 8. auxiliary ring. DETAILED DESCRIPTION

[0033] It should be noted that in the description of the embodiments of the present application, the terms "front, rear", "left, right", "up, down", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application. The terms "install", "connect", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0034] The present application is further described in detail below through drawings and examples.

[0035] Reference Figures 1 to 10The embodiment of the present application provides an elevator light curtain with an adjustable monitoring range, including a mounting plate 1 and an elevator body 5. An adjusting component 2 is arranged on the side of the mounting plate 1. The adjusting component 2 includes a slide groove 21, which is opened inside the elevator body 5. A slider 23 is slidably connected inside the slide groove 21. The mounting plate 1 is fixedly mounted on the outer side of the slider 23. An internal hole 26 is opened inside the slider 23. A partition 27 is fixedly installed inside the internal hole 26. Springs 25 are fixedly installed on both sides of the partition 27. Blocks 24 are fixedly installed on the outer ends of the springs 25. The blocks 24 are slidably connected inside the internal hole 26. Slots 22 are opened on both side walls of the slide groove 21. The blocks 24 are plugged into the corresponding slots 22. A mounting component 3 is arranged on the side of the mounting plate 1. A light curtain body 6 is arranged between the mounting components 3. A transmitter and receiver 7 are fixedly installed on the side of the light curtain body 6. A cleaning component 4 is arranged on the outer sides of the mounting plate 1, the light curtain body 6 and the transmitter and receiver 7. The transmitter-receiver 7 on the left is the transmitting end of the light curtain, and the transmitter-receiver 7 on the right is the receiving end of the light curtain. The positions of the transmitter-receivers 7 on the left and right sides correspond one to one.

[0036] The outer end of the clamping block 24 is arc-shaped, the inner side of the clamping slot 22 is arc-shaped, the clamping block 24 is completely inserted into the clamping slot 22, and the clamping slots 22 are evenly opened on the left and right sides of the slide slot 21.

[0037] In this embodiment, when adjusting the range of the light curtain, the auxiliary ring 8 is used to assist in pulling the mounting plate 1, and the pulling force on the mounting plate 1 is transmitted to the slider 23 and to the internal block 24. The block 24 is squeezed and shrinks inward, and the spring 25 shrinks at the same time. After the block 24 shrinks from the inside of the slot 22, the slider 23 is no longer restricted and can slide up and down in the slide slot 21, thereby realizing the free adjustment of the position of the slider 23 and the mounting plate 1, thereby realizing the adjustment of the position of the light curtain body 6 and the adjustment of the monitoring range; and after the adjustment, the block 24 moves outward under the elastic force of the spring 25 and can be moved back to the inside of the slot 22, and the slider 23 is re-fixed by plugging the block 24 into the inside of the slot 22, thereby realizing the effect that the slider 23 and the light curtain body 6 can move up and down at will and can be automatically fixed after moving.

[0038] Reference Figures 1 to 10 In one aspect of the present embodiment, the mounting assembly 3 includes a mounting block 31, which is fixedly mounted on the upper and lower sides of the side of the mounting plate 1, and the light curtain body 6 is inserted between the upper and lower mounting blocks 31, and the upper and lower sides of the mounting plate 1 are fixedly mounted with auxiliary rings 8. An internal groove 34 is provided inside the mounting block 31, and a moving block 36 is slidably connected inside the internal groove 34. Two plug-in blocks 37 are fixedly mounted on the bottom of the moving block 36, and slots 38 are provided on the upper and lower sides of the light curtain body 6. The plug-in blocks 37 penetrate the bottom wall of the mounting block 31 and are inserted into the corresponding slots 38.

[0039] The mounting block 31 is internally rotatably connected with a rotating rod 33, the inner end of which is fixedly mounted with a screw rod 35, the inner end of which is rotatably connected to the inner wall of the inner groove 34, the screw rod 35 is threadedly connected to the inside of the moving block 36, and the outer end of the rotating rod 33 is fixedly mounted with a knob 32.

[0040] In this embodiment, when the light curtain body 6 needs to be replaced, the knob 32 is turned to drive the rotating rod 33 to rotate. The rotation of the rotating rod 33 can drive the internal screw 35 to rotate. The rotation of the screw 35 can drive the internal moving block 36 to move. The movement of the moving block 36 can drive the lower plug block 37 to move. By moving the plug block 37 and removing it from the inside of the slot 38, the fixation of the light curtain body 6 by the plug block 37 can be released, and the light curtain body 6 can be removed, thereby achieving the effect of convenient disassembly and replacement of the light curtain body 6; when installing a new light curtain body 6, the light curtain body 6 is re-clamped between the upper and lower mounting blocks 31. When clamped, the plug block 37 is aligned with the slot 38. At this time, the knob 32 is turned to move the moving block 36 again, and the plug block 37 can be reinserted into the inside of the slot 38 to fix the light curtain body 6.

[0041] Reference Figures 1 to 10 In one aspect of the present embodiment, the cleaning assembly 4 includes a side groove 41, the side groove 41 is opened on both sides of the mounting plate 1, the side groove 41 is slidably connected with a side block 42, the outer side of the side block 42 is fixedly installed with a side plate 43, a slide plate 44 is fixedly installed between the two side plates 43, and a cleaning brush 45 is fixedly installed on the inner side of the slide plate 44, and the cleaning brush 45 is attached to the front of the light curtain body 6 and the transmitter and receiver 7.

[0042] An iron sheet is fixedly mounted on the inner bottom wall of the side groove 41 , and the side block 42 is a magnet block, which is adsorbed on the top of the iron sheet.

[0043] In this embodiment, when the light curtain body 6 needs to be cleaned, the slide plate 44 can be manually pulled up and down. The movement of the slide plate 44 can drive the cleaning brush 45 on the inside to move along the light curtain body 6 and the transmitter-receiver 7, so that the light curtain body 6 and the transmitter-receiver 7 are cleaned by the cleaning brush 45. By regularly cleaning the light curtain body 6 and the transmitter-receiver 7, the detection effect of the light curtain body 6 and the transmitter-receiver 7 can be ensured to be better. When not cleaned, the side block 42 can be adsorbed on the iron sheet inside the side groove 41 to ensure that the slide plate 44 can be fixed on the side of the light curtain body 6.

[0044] This embodiment also discloses a method for adjusting an elevator light curtain, comprising the following steps:

[0045] Step 1: When adjusting the position of the mounting plate 1 and the light curtain body 6, the auxiliary rings 8 on the upper and lower sides are pulled, and the block 24 is squeezed into the inner hole 26, and the block 24 is moved out of the slot 22, and the slider 23 can slide up and down in the slot 21, so as to adjust the position of the slider 23, and then adjust the position of the mounting plate 1 and the light curtain body 6;

[0046] Step 2: After the position is adjusted, the spring 25 takes the block 24 away and resets it. The block 24 is re-inserted into the corresponding slot 22 to re-fix the mounting plate 1 and the light curtain body 6, so that the adjustment is convenient and the adjustment is automatically fixed.

[0047] Step 3: By rotating the screw 35 to drive the moving block 36 and the inserting block 37 to move, the inserting block 37 is moved out of the slot 38 to release the fixation of the light curtain body 6, and the light curtain body 6 can be disassembled, so that the light curtain body 6 can be easily replaced.

[0048] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0049] Working principle: When adjusting the range of the light curtain, the auxiliary ring 8 is used to assist in pulling the mounting plate 1, and the tension on the mounting plate 1 is transmitted to the slider 23 and then to the internal clamping block 24. The clamping block 24 is squeezed and shrinks inwards. At the same time, the spring 25 shrinks. After the clamping block 24 shrinks from the inside of the slot 22, the slider 23 is no longer restricted and can slide up and down in the slot 21, thereby realizing the free adjustment of the position of the slider 23 and the mounting plate 1, thereby realizing the adjustment of the position of the light curtain body 6, and realizing the adjustment of the monitoring range; and after the adjustment Under the elastic force of the spring 25, the block 24 moves outward and can be moved back into the slot 22. The block 24 is inserted into the slot 22 to re-fix the slider 23, so that the slider 23 and the light curtain body 6 can be moved up and down at will, and can be automatically fixed after the movement. When the light curtain body 6 needs to be replaced, the knob 32 is turned to drive the rotating rod 33 to rotate, and the rotation of the rotating rod 33 can drive the internal screw 35 to rotate, and the rotation of the screw 35 can drive the internal moving block 36 to move, and the movement of the moving block 36 can drive The lower plug block 37 moves, and the plug block 37 moves and moves out of the slot 38, so that the fixation of the light curtain body 6 by the plug block 37 can be released, and the light curtain body 6 can be removed, thereby realizing the effect of convenient disassembly and replacement of the light curtain body 6; when installing a new light curtain body 6, the light curtain body 6 is clamped between the upper and lower mounting blocks 31 again, and the plug block 37 is aligned with the slot 38 when clamped, and the knob 32 is turned to move the moving block 36 again, so that the plug block 37 can be reinserted into the slot 38 to fix the light curtain body 6; the light curtain body 6 needs to be fixed. When cleaning the body 6, the slide plate 44 can be manually pulled up and down. The movement of the slide plate 44 can drive the cleaning brush 45 on the inside to move along the light curtain body 6 and the transmitter-receiver 7, so that the light curtain body 6 and the transmitter-receiver 7 are cleaned by the cleaning brush 45. By regularly cleaning the light curtain body 6 and the transmitter-receiver 7, the detection effect of the light curtain body 6 and the transmitter-receiver 7 can be guaranteed to be better, and when not cleaned, the side block 42 can be adsorbed on the iron sheet inside the side groove 41 to ensure that the slide plate 44 can be fixed on the side of the light curtain body 6.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0051] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An elevator light curtain with adjustable monitoring range, comprising a mounting plate (1) and an elevator body (5), characterized in that: An adjustment component (2) is arranged on the side of the mounting plate (1), the adjustment component (2) comprising a slide groove (21), the slide groove (21) being arranged inside the elevator body (5), a slider (23) being slidably connected inside the slide groove (21), the mounting plate (1) being fixedly mounted on the outer side of the slider (23), an internal hole (26) being arranged inside the slider (23), a partition (27) being fixedly mounted inside the internal hole (26), springs (25) being fixedly mounted on both sides of the partition (27), the springs (25) being arranged on the outer side of the slider (23), and a spring (25) being fixedly mounted on the inner side of the slider (23). The outer ends of the slide grooves (25) are fixedly mounted with a card block (24), the card block (24) is slidably connected to the inside of the internal hole (26), the two side walls of the slide groove (21) are provided with card slots (22), the card block (24) is inserted into the corresponding card slots (22), the side of the mounting plate (1) is provided with a mounting assembly (3), a light curtain body (6) is arranged between the mounting assemblies (3), a transmitter and receiver (7) is fixedly mounted on the side of the light curtain body (6), and the mounting plate (1), the light curtain body (6) and the transmitter and receiver (7) are A cleaning assembly (4) is arranged on the outside of the mounting plate (1), the mounting assembly (3) comprises a mounting block (31), the mounting block (31) is fixedly mounted on the upper and lower sides of the side of the mounting plate (1), the light curtain body (6) is inserted between the upper and lower mounting blocks (31), the upper and lower sides of the mounting plate (1) are fixedly mounted with auxiliary rings (8), the mounting block (31) is provided with an internal groove (34), the internal of the internal groove (34) is slidably connected with a moving block (36), and the bottom of the moving block (36) is fixedly mounted with two plug blocks (3 7), slots (38) are provided on both the upper and lower sides of the light curtain body (6), the insert block (37) passes through the bottom wall of the mounting block (31) and is inserted into the corresponding slot (38), the mounting block (31) is rotatably connected to a rotating rod (33) inside, the inner end of the rotating rod (33) is fixedly installed with a screw rod (35), the inner end of the screw rod (35) is rotatably connected to the inner wall of the internal groove (34), the screw rod (35) is threadedly connected to pass through the inside of the moving block (36), and the outer end of the rotating rod (33) is fixedly installed with a knob (32).

2. The elevator light curtain with adjustable monitoring range according to claim 1, characterized in that: The outer end of the clamping block (24) is arc-shaped, the inner side of the clamping slot (22) is arc-shaped, the clamping block (24) is completely inserted into the clamping slot (22), and the clamping slots (22) are evenly formed on the left and right sides of the slide slot (21).

3. The elevator light curtain with adjustable monitoring range according to claim 1, characterized in that: The cleaning assembly (4) comprises a side groove (41), wherein the side groove (41) is provided on both sides of the mounting plate (1), a side block (42) is slidably connected inside the side groove (41), a side plate (43) is fixedly mounted on the outer side of the side block (42), a slide plate (44) is fixedly mounted between the two side plates (43), a cleaning brush (45) is fixedly mounted on the inner side of the slide plate (44), and the cleaning brush (45) is attached to the front side of the light curtain body (6) and the transmitter and receiver (7).

4. The elevator light curtain with adjustable monitoring range according to claim 3, characterized in that: An iron sheet is fixedly mounted on the inner bottom wall of the side groove (41); the side block (42) is a magnet block; and the side block (42) is adsorbed on the top of the iron sheet.

5. The elevator light curtain with adjustable monitoring range according to claim 1, characterized in that: The left-side transmitter and receiver (7) is the transmitting end of the light curtain, and the right-side transmitter and receiver (7) is the receiving end of the light curtain. The positions of the transmitter and receiver (7) on the left and right sides correspond to each other.

6. A method for adjusting an elevator light curtain, for adjusting an elevator light curtain with adjustable monitoring range as claimed in any one of claims 1 to 5, characterized in that: The steps include: Step 1: When adjusting the position of the mounting plate (1) and the light curtain body (6), the auxiliary rings (8) on the upper and lower sides are pulled. After pulling, the clamping block (24) is squeezed into the inner hole (26), and the clamping block (24) is moved out from the inside of the clamping groove (22). The slider (23) can slide up and down in the slide groove (21), thereby adjusting the position of the slider (23), and then adjusting the position of the mounting plate (1) and the light curtain body (6); Step 2: After the position is adjusted, the spring (25) takes away the card block (24) to reset, and the card block (24) is re-inserted into the corresponding card slot (22) to re-fix the mounting plate (1) and the light curtain body (6), thereby achieving the effect of convenient adjustment and automatic fixing after adjustment; Step 3: By rotating the screw rod (35) to drive the moving block (36) and the insert block (37) to move, the insert block (37) is moved out of the slot (38) to release the fixation of the light curtain body (6), and the light curtain body (6) can be disassembled, so that the light curtain body (6) can be easily replaced.

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