JPH04504549A - Seat suspension device for transportation means - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Seat suspension gene device for transportation means 1 bean dumpling 1 yen 1. Field of invention The present invention relates to a seat suspension system for a vehicle of transportation. As used herein, “means of transportation” ” refers to automobiles, four-wheel drive vehicles (4WD), trucks, prime movers, ground leveling machines, etc. (e.g.), aircraft and ships.

2. Conventional technology The ease and efficiency of the transport worker's work is determined by the ease and efficiency of the transport worker's work. Use appropriate suspension genes to eliminate or minimize shocks and vibrations transmitted to the It depends on the installation of the device on the seat.

Conventionally, multiple suspension gene devices have been proposed to suppress shock and vibration.

Spring-loaded seat supports, typically braked by hydraulic or pneumatic braking devices I often rely on frames. - Example is AU-B-88609/86 (58203 1) (D, M, Cullay et al.). The big problem with these devices must be slow in order for braking to be effective, which makes it difficult to import As a result of being out of phase with the suspension engine of the feeding means, additional shock is applied to the worker's seat. It is about joining. In many cases, braking is better (than a suspension system without It is preferable to use a brake-type non-braking suspension system, so workers should does not utilize the braking effect of

One of the reasons for the shortcomings of existing suspension systems is the seat suspension system design. I have a basic misunderstanding about meters. The purpose of the design is to provide transportation with an uneven running path. Providing a device that allows the operator's seat to follow a virtually unobstructed condition even when traveling on Is Rukoto. In the past, designers assumed that the seat would move relative to the vehicle. We were designing the vehicle, but what we were actually doing was making sure that the means of transportation moved relative to the seat. The design was based on the premise that In addition, designers do not need a suspension sealing device. It also had a braking function.

LJL number The purpose of the present invention is to provide a seat suspension system with superior impact resistance and vibration resistance compared to existing systems. It is also a preferred objective to provide an engine system which requires braking action itself. The goal is to provide equipment that is not available.

A further preferred objective is a device that can be quickly raised from a normal preloaded state. Our goal is to provide the following.

A further advantage is to add a preload to the equipment that is adjustable according to the weight of the worker. The goal is to be able to do the same.

Another purpose that is even more suitable is that the profile is very low; The purpose of this invention is to provide a Vt@ equipped with a runner.

Other preferred objects of the invention will become apparent from the description below. Book According to one embodiment of the invention, Attach a base frame that can be loaded onto a vehicle and a sort of vehicle worker. seat support frame for, interconnecting the frames to allow the frames to move substantially in parallel; It can be secured to the cross arm body and the cam driven means attached to the driven body support means. a pair of cam track means provided on the crossed arm body, and a spring interconnecting the driven support means and the cross-arm body or one of the frames; means, and as the frames approach each other, the cam follower means moving along the track means to extend the spring means; Said member such that its longitudinal direction is opposite to the direction of movement of said frame from its initial position. The present invention provides a sheet suspension wrapping device for a means of transportation in which the following is provided.

Further, according to a second embodiment of the present invention, a base frame that can be mounted on a means of transportation is provided. and a seat support frame for mounting a sort of vehicle operator; interconnecting the frames to allow the frames to move substantially in parallel; a cross arm body, a first cam track on the cross arm body and a second cam track on the cross arm body; on one of said frames and a cam follower attached to the follower support means. a pair of cam track means that can be secured to each of the moving means; a spring hand interconnecting said driven support means and said cross-arm body or one of said frames; and as the frames approach each other, the cam follower means moving along a track means to extend the spring means; and extending the spring means. the member so that the direction is opposite to the direction of movement of the frame from its initial position; The present invention provides a seat suspension gene device for a means of transportation.

Preferably, the frame is rectangular in top view. Also preferably, the above The base frame is provided with runners or slides that extend the length of the vehicle seat. Adjust toward your hands.

The seat support frame may fix the seat with bolts (or The frame may be integrally molded on the bottom of the seat.

Preferably, the cross-arm body includes a pair of first cross-arms and a pair of second cross-arms. and pivoting the arms to the frame and to each other. 2nd intercourse For fork arms, this may be connected to the frame by pivot links. . Furthermore, multiple pairs of arms may be connected using a reinforcing plate. preferred Alternatively, overlap part of the cam track, and as the frame moves together, The cam tracks are moved closer together. Also preferably, Camtra Offset the locks so that each engages a respective roller (as a cam follower) I'll do what I do. More preferably, by selecting the shape of the cam track. so that the frame does not reach the bottom.

Preferably, a roller is rotatably mounted at the end of the transverse yoke (as a driven support means). At the same time, a pair of tension springs connects the yoke to the base frame. match.

An adjustable preloading device may also be provided. In this case, move the swing arm to the cam. Pivotally attached to either end of the rack and equipped with rollers e. l and rock the preload spring Connect to the middle of the arm and to the rest of the frame.

In addition, by making it possible to adjust one of the multiple pairs of cam tracks, the preload device The preload applied to the spring means and the tension applied to the spring means may be varied.

Preferably, the adjustment side of the seat is vertical and acts as a spring element (an anti-friction element). more isolated, noise-free, and with wide component tolerances. Make it available for use.

Preferably, the g-section slide of the seat incorporates a latching mechanism, more preferably this Insert it into the rack that forms the slide and attach it to the notebook belt seat or seat. Limit the loads caused by attachment to the support frame.

A tongue integral (or diaphragm) means is provided between the frames to prevent movement between the frames. It is also possible to control the Preferably, the opening stroke of the tongue integral It takes effect only at the end of the frame to prevent the frame from "piercing through".

Of.

In order to enable a thorough understanding of the invention, some examples are provided below with reference to the accompanying drawings. I will explain.

11th! I is the side showing the first embodiment of the device, including a partial cross section for clarity of illustration. It is a front view.

21st! I is a top view of the device.

FIG. 3 is a cross-sectional side view taken along line 3-3 in FIG.

Figure 4 is a cross-sectional end view of the bellows taken along line 4-4 in Figure 3. Figure 5 is for clarity. FIG. 4 is a side view showing a second embodiment of the present device, with some parts omitted for convenience.

FIG. 6 is a plan view showing half of the second embodiment, with some parts omitted for clarity. It is.

FIG. 7 is a cross-sectional side view showing one of the seat slides.

FIG. 8 is a cross-sectional end view taken along line AA in FIG. 7.

FIG. 9 is a cross-sectional end view taken along line B--B in FIG. 7.

Detailed description of the preferred embodiment Explaining FIGS. 1 to 3, the first embodiment of the seat suspension ventilation device 10 is Almost U-shaped base frame! ! Consists of. Flange rail 12 of the frame 1 construction is made of RHS steel, and the rear rail 13 is made of angle iron. Bottom wall of side rail 12 Seat runner 1 with slots formed at its ends, into which side rails 12 slide. 5 studs 14 are provided. Each runner 15 is located within the cam slot 18 of the boss 19. It is releasably locked by a horizontal pin 16 having a finger 17 provided at the side. base The operating handle 20 that crosses the front part of the frame 11 is secured by a rod 2I. Connected to finger 17. When the handle is rotated, the pin 16 rotates and the cam slot It is moved to the retracted position by the finger 17 moving within the cut 18. This saku 1. The bottle is press-fitted by the spring 22 via the rod 23 to the locking position.

The side rails 25 and rear rails 26 of the rectangular seat support frame 24 are RH. 8 steel, and the front rail 27 is made of flat steel.

The base frame 11 and the seat support frame 24 each have a pair of first intersecting arms. 28 and a pair of second intersecting arms 29 are connected vertically in parallel. 2nd crossover A pivot bin is attached to the center of each arm 29 to the center of the corresponding first cross arm 28. Pivot join by 3o. Each pair of crossed arms is connected by a transverse plate 31.32. Reinforce (and interconnect) 28.29.

The upper end, that is, the front end of the first cross arm 28 is located within the front end of the seat support frame 11 (laterally). The shaft 33 pivots about a horizontal axis (formed by the shaft 33). 1st crossed arm 28 The bottom or rear end pivot bin 34 is connected to the side rail 12 of the base frame 11. slide through the slot 35 of the block 36 on the inside of the rear end, and Similar pivot bins 37 at the top and rear ends of the frame 29 are located on the sides of the seat support frame 24. so as to slide through the slot 38 of the block 39 on the inside of the rear end of the section rail 26. Become (become)

Cam tracks 40.41 are installed at the rear ends of the first and second intersecting arms 28.29, respectively. Let's go. The cam tracks overlap at the front edge, and the cam tracks are horizontal when viewed from the front. offset in the direction.

At each end of the U-shaped horizontal yoke 44 (separated by washers) A pair of rollers 42 is rotatably attached to an axle 43.

A pair of tension springs 45 are inserted into the yoke 44 at one end and a nut 48 at the other end. It is attached to a balancer 46 which has a rod 47 with a screw hole in the center. This is , 48 are the brackets of the reinforcing plate 32 that interconnect the front ends of the second intersecting arms 29. It is supported by a bracket 49.

As for the integrated tongue 50, its flexible rubber bag 51 is supported by an internal coil spring 52. hold The bottom of this rubber bag 51 is fixed to the rear rail 13 of the base frame 11. Ru.

The bracket 54 connects the upper part of the rubber bag 51 to the rear rail of the seat support frame 24. 26 and a threaded tube 56 opening into the inside of the rubber bag. This bracket is fixed by a nut 55.

The rubber valve member 57 is connected to the end of the tube 5B by a lightweight compression spring 58. Although normally engaged, this member does not have a valve seat and therefore the frame moves closer to each other. 11.24 When the tongue unit 50 is crushed, air can be immediately supplied. can. Because the diameter of the hole 59 in the valve member 57 is relatively large, the frame 11.24 When separated from each other, air flows into the tongue unit 50 relatively unrestricted.

I will explain the operation of this suspension engine andio below. In addition, seat support The frame is relatively stationary and the base frame is raised relative to this. Explain that it moves downward. In other words, the means of transportation (hereinafter referred to as vehicles) The operator sheet can be compared even when traveling on a traveling route (for ships, there are waves). Explain that there is no interference.

Bolt the seat runner 15 to the workroom floor via the studs 14 (not shown). the suspension device 10 (and the seat) using the operating handle 20. ), pull out the pin 16, and place the sorting frame ll on the sheet runner. 15.

Work performed while seated on a seat (not shown) fixed with bolts to the seat support frame 24 The initial preload is determined by the tension set on the spring 45 by adjusting the nut 48. Reduce frame leap distance to heavy height. (This makes it possible to deal with differences in the weight of workers. a) If the vehicle hits a bump and tries to lift it, the base frame 11 is raised (in the direction of arrow A) and (inevitably) onto the seat support frame. Head towards. Since the cross arms 28 and 29 close around the pivot pin 3o, the cam When the tracks 40 and 41 converge, the roller is pushed backward in the direction of arrow B and moves. Ru.

The yoke 44 pulls the spring 45, and the tension of the spring 45 on the yoke 44 Base frame 1 until equal to the force on roller 42 from rack 40.41 1 is lifted and moves the roller in the direction of arrow B.

When the vehicle goes over the bump, the roller 42 moves against the cam track 4o141. is pulled in the opposite direction to arrow B, and the distance of 11.24 between frames returns to its original value.

As a result of the displacement of the base frame 11 in the direction of arrow A, the angular displacement of the intersecting arms 28, 29 The base frame 1 of the suspension device becomes thicker at a faster speed. The force that opposes the vertical displacement from the initial position of The effective spring action of the base frame along with the displacement of the base frame from its initial preload position Due to the shape of the cam track, the seat frame will not reach the bottom. stomach.

When the vehicle plunges into a hole, the base frame 11 moves in the opposite direction to arrow A. Then, the roller moves in the opposite direction to arrow B. Cam track 40.41 shape Depending on the selection, the restoring force applied by the spring to the roller 42 can be reduced, but in this case The base frame 11 is moved in the direction of arrow A towards its initial preload position. It becomes.

When the vehicle plunges into a hole, the tongue unit 50 does not perform braking, but merely controls movement. Only. When the vehicle hits a bump, the base frame 11 moves in the direction of arrow A. If it is thought that the rubber bag 51 has moved, the rubber bag 51 supported by the internal spring 52 will begin to soak, and the valve will be damaged. Since the member 57 is not seated, air is discharged from the rubber bag 51. base frame When the valve member 11 begins to move in the opposite direction of arrow A, the valve member 57 is seated again, but is empty. Air immediately flows into the rubber bag through holes 59.

In this case, the air pressure in the rubber bag drops to atmospheric pressure and negative pressure (i.e. vacuum) is created. The only time it becomes sluggish is towards the end of the stroke. Therefore, “braking” is more suitable. ``Movement control'' will occur. This causes the frame to move beyond the preload position and “ It doesn't stick out.

By changing the shape of the cam track 40, 41 and the tension applied to the spring 45, The support device 10 can be used by a special user, e.g. the owner/driver of a dosage semi-trailer. Although it can be specially designed for various types of vehicles, even general-purpose cam trucks can have spring tension! 1 To put it simply, it is possible to meet the needs of each general user to an extremely high standard. Ru. Since the tongue unit does not perform braking and only controls movement, this device can There is no phase shift with Svennoyon, so it is very easy to work with.　Next 5 and 6 will be explained. Seat suspension four-mount rI1 of the second embodiment The base frame 110 of 1°O is made of sheet metal, and the side flanges are attached to the floor plate l11. 112 (see Figures 8 and 9).

As shown in FIGS. 7-9, a silk cross section is fixed to each side flange 112. The frame slide rail 113 is attached to the vehicle by means of studs (not shown). It slides on a base slide rail 114 that is attached to the floor. The head of the above stud is the T-shaped slot 15 of the base slide rail 114. frame slide The side frame slide rail of the rail 113 has an anti-friction strip with a channel-shaped cross section. 116, 117, and these channels have side ribs as spring elements. Since the top is integrated, a seat slide body that does not generate noise can be obtained.

The horizontal flange 118 of the base slide rail 114 has a plurality of slots or holes 1 19 are provided at equal intervals. These slots are one of the pivot type locking pars 121. 1120 can be releasably attached. This locking par 121 is the pivot bin 1 22, it is mounted within the frame slide rail 113 by a hinge. Rocky The release parr 121 slides on the frame slide rail 113. Controlled by 3. Regarding the pin 124 of the frame slide rail 113, Then it fits into the elongated slot 125 of the release bar 123.　Frame Sura A bell crank 126 is connected to the front end of the idle rail 113 via a first shaft 127. and pivoted to the vertical plate 128. This bell crank 126 must be equipped with a handle (not shown). Berg at the end of the release par 123 Bin 129 of leg 130 of rank 126 fits into slot 131 . release bar The other end of 123 is provided with an inclined elongated loop member 132, which connects the inclined cam slot 1. 33 and the driven bin 134 is fitted.

A tension spring 135 is attached to the frame slide rail 113 at one end of the bin 124. , and is engaged with the pin 136 of the release bar 123 at the other end.

A pivot shaft 127 allows the handle (not shown) to slide onto the other seat. It is connected to the bell crank of the body so that both seat slide bodies operate as one.

When the handle is lifted, the bell crank 128 pivots in the direction of arrow C. , and the release bar 123 is pulled by the tension spring 135 by the pin 129 in the slot 131. Move forward in the direction of the arrow. As the loop member 132 moves forward, the cam slot The locking par 12 is moved to the position shown by the dotted line by the driven pin 134 of the cut 113. 1 retreats in the direction of arrow E. In this position, #120 is the base slide rail 1 The slots 119 of the 14 flanges 118 are spaced apart. Next, this device! ! 100 The seat position can be adjusted by moving it relative to the base slide rail 114. Han When the dollar is released, the release bar 123 returns to its original position and the locking par 12 1 teeth 120 re-engage with slots 119 in flange 118 to hold the sheet longitudinally. sticks to.

Returning to FIGS. 5 and 6, the seat support frame 140 is approximately It is rectangular and has no side rails 141, rear rails 142, and front rails 143. Both are made of RH8 steel. Horizontal plate 144 is welded to the underside of rear rail 142. Ru.

For the base frame 110 and seat frame 140, the transverse tube 148 ．． 147 to the base frame 110 and seat frame 140. a pair of first links I45 and an intermediate link (or pivot member) 149, a pair coupled to the base frame 110 and the seat frame 140 by 150; The second link 148 connects the upper and lower parts substantially parallel to each other. These intermediate links 14 9,150 has a pivot bin 151.152 on the base frame and seat frame and to the second link 148 by pivot bins 153, 154. Link. Then, the first and second links are connected to each other in a sandwich-like manner by the pivot bin 155. conclude. The first link 145 is torsionally rigid and the second link 148 is bendingly rigid. It can support larger bending loads and torsional loads.

The movement of the sheet relative to the sheet slide body can be controlled by appropriate selection of parameters. It can be made almost parallel with a small translation element.

For each first cam track 160 having a curved shape 161, each first link parallel to the wall and away from it. these cam trucks interconnects the transverse tubes 146, 147. A second cover with an inclined shape 163 For each track 162, the drop plate 1 of the base frame 110 A cam 16 is slidably attached to the cam 11 and controlled by a lever 165. 4 to enable selective adjustment.

Then, the first and second cam tracks 160, 1B2 are connected to these curved portions and inclined portions 1. 61 and 163 are arranged so as to overlap.

Multiple pairs of rollers 166, 167 engaging cam tracks 160, 182, respectively are provided at each end of the horizontal par 168. This par 168 has one end attached to the horizontal tube 148. The other ends of the pair of main springs 169 are engaged.

The pair of swinging arms 171 of the adjustable preload body 170 are tilted in parallel) 172 , 173, each of which is connected to a pivot bit of the second cam track 182. Pivotally connected by pin 174. At the other end of each swing arm 171 rotates to the axle +76 A roller 175 is freely provided and supported under the horizontal plate 144. Each swing a A preload spring 177 is provided for the arm 171 and the side plates 172, 173 are attached to each other. It is connected to the connecting horizontal bottle 178 and is engaged with the horizontal tube 146.

The main spring +69, and the preload body 170 are connected to the swing arm 171 and the preload 7 with the first and second cam tracks 180, 182, approximately constant preload. is generated in the vertical direction, which is determined by the operator for different preloads i! 1 verse completed Ru.

The second cam track 162 shown in FIG. 5 is in the position of maximum preload. cam When 1B4 rotates and the second cam track moves in the direction of arrow F, the The attached swing arm 171 also moves in the F direction, and the main spring 169 and preload spring 17 7 The tension applied to both is reduced, and the preload applied to the entire device is reduced.

Once the operator has set the preload, it can be maintained throughout use in a wide range of up and down positions. and its preload remains constant, and the spring stiffness is almost zero. This is it The initial preload position shown by the solid line in Figure 5 and the fully moved position shown by the dotted line in the same figure The separation from the vehicle reaches 100% over the travel range (e.g. 70 mm) between Ru.

However, (attitude, acting force or control action, and especially important, vehicle (as the acceleration applied to the seat slide and other parts attached to it changes) Since the amount changes constantly, the main spring 169 and cam track 180°162 are thrown. , to support the moving mass minus the preload. In other words, true suspended mass = movable Mass - Child load.

Therefore, in principle a softer spring element is acceptable (where the worker is most sensitive). Transmission of forces/accelerations/displacements by mechanical means at low frequencies (corresponding to It can be made smaller.

As mentioned above, by adjusting the second cam track 162, the weight of the worker can be adjusted. The preload and main spring values can be adjusted to suit.

As will be apparent to those skilled in the art from the foregoing, the present invention is simple but highly efficient. It provides a seat suspension placement device with good performance and is easy to work with (desired This allows for a very low profile over the range of travel.

It should be noted that various modifications may be made to the embodiments described above within the scope of the invention defined in the claims. Changes and changes can be made.

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Claims (21)

[Claims] (1) Remove the base frame that can be mounted on the transportation vehicle and the seat for the transportation vehicle worker. A seat support frame for attaching the interconnecting the frames to allow the frames to move substantially in parallel; The cross arm body and the cam driven means attached to the driven body support means can be engaged with each other. a pair of cam track means provided on the crossed arm body, and a spring interconnecting the driven support means and the cross-arm body or one of the frames; means, and as the frames approach each other, the cam follower means moving along the track means to extend the spring means; Said member such that its longitudinal direction is opposite to the direction of movement of said frame from its initial position. Seat suspension device for transportation vehicles equipped with (2) the cross-arm body includes a pair of first cross-arms and a pair of second cross-arms; Pivotly connect these arms to the frame and to each other using reinforcing plates. 2. The apparatus of claim 1, wherein the arms of each pair are interconnected using a wire. (3) The cam truck is attached to the cross arm behind the pivot interconnection portion of the arm. The cam tracks are overlapped at the front end and offset in the axial direction. , each cam follower. (4) A rotatable space is provided at the end of the horizontal yoke provided as the cam driven support means. Any one of claims 1 to 3, wherein the cam moving means is constituted by a pair of rollers provided. Equipment described in Section. (5) The spring means is a reinforcing plate that interconnects either one of the pair of crossed arms. a pair of springs interconnecting the yoke to the base and adjusting the tension applied to the spring; 5. A device according to claim 4, comprising means for enabling. (6) Machining the cam track means from the initial preload position of the base frame. The distance between the frames is reduced by displacement relative to the seat support means. Therefore, according to any one of claims 1 to 5, the spring stiffness is increased. equipment. (7) further including a movement control device, the control device interconnecting the two frames; When the base frame returns to the initial preload position after displacement, the base frame 7. A device according to any one of claims 1 to 6, wherein the bellows control movement. (8) Comparison of a bag body in which the bellows body has a support means inside and the bellows body communicates with the inside of the bellows. It has a large air flow path and is designed to immediately send air out from inside when the bag is submerged. a valve means provided in said air flow path which opens immediately, and which immediately opens when said bag is returned to its original position; Air is pumped into the bag and a vacuum is created inside the bag at the end of its return stroke. , and an air hole formed in the valve means. (9) Attach the base frame that can be mounted on the transportation vehicle and the seat for the transportation vehicle worker. A seat support frame for attaching the interconnecting the frames to allow the frames to move substantially in parallel; a cross-arm body, a first cam track on the cross-arm body, and a second cam track on the cross-arm body; on one of said frames and a cam follower attached to the follower support means. a pair of cam track means engageable with each of the moving means; a spring hand interconnecting said driven support means and said cross-arm body or one of said frames; and as the frames approach each other, the cam follower means moving along a track means to extend the spring means; and extending the spring means. the member so that the direction is opposite to the direction of movement of the frame from its initial position; Seat suspension device for transportation vehicles installed. (10) a pair of first links in which the cross arm body is pivotally coupled to the frame; and connected to the frame by an intermediate link that is pivoted to the frame. a pair of second links, and the first and second links are pivoted in the middle. The apparatus according to claim 8. (11) Mount the first cam track parallel to the first link and movably. adjustingly attaching the second cam track to the base frame; The first and second cam tracks of each pair overlap at the front end and are axially offset 11. The apparatus of claim 10, wherein said cam follower means is engaged with said cam follower means. (12) A space is rotatably attached to the end of the horizontal yoke provided as the cam driven support means. Any one of claims 9 to 11, wherein the cam moving means is constituted by a pair of rollers provided with a roller pair. The device according to item 1. (13) said spring means interconnecting said horizontal bar to said base frame; Claim 1 comprising a spring and means capable of varying the tension of the main spring. The device according to item 2. (14) by moving the second cam track relative to the base frame; 14. The device of claim 13, which adjusts the tension applied to the main spring. (15) Machining the cam track means to adjust the initial preload position of the base frame. As the distance between the frames decreases due to displacement relative to the seat support means, Therefore, according to any one of claims 9 to 14, the spring stiffness is increased. The device described. (16) a spring that applies a substantially constant preload in the vertical direction over the entire range of travel; According to any one of claims 9 to 15, further comprising a preload body having substantially zero stiffness. The device described. (17) a pair of swinging arms to which the child load body is attached to one end of the cam track means; and a rotor provided at the other end of the swing arm that can engage either one of the frames. and a pre-assembly for interconnecting the swinging arm with the other frame midway. 17. The device of claim 16, comprising a load spring. (18) Attach the swing arm to the second cam track, and attach the roller means to the shaft. The child load spring is supported on the underside of the base frame, and the child load spring is connected to the base frame. and adjust the second cam track of the base frame to reduce the preload on the device. 18. A device according to claim 17 for adjusting weight. (19) A pair of substantially vertical frame slide rails are provided on the base frame. and slidably fit the rail into a base slide rail anchored to the floor of the vehicle. Then, each slide rail is releasably locked by the locking means, According to any one of claims 1 to 18, the seat is adjusted for the means of transport. The device described. (20) Fit the frame slide rail into the anti-friction element in the base slide rail. When the rail is fitted with a lip or flange integral to the element, the rail generates noise. and prevent the locking bar of the locking means from sliding the frame. the teeth of the base slide rail. Claim 19: releasably engageable with a slot, hole or flange. The device described in. (21) Attach each release bar to each frame slide rail so that it can slide freely, and The tilting cams of the release bar can be operated by a lever through a rank mechanism. allows the rod to engage its corresponding locking bar pin, and the release As the removal bar moves forward from its initial position, the cam slot moves the teeth and Locking engagement of teeth with slots or holes in the flange of the base slide rail and spring means are provided to return the release bar to its initial position. The device described.