Driving sprocket for a marine-type chain

Abstract

A driving sprocket for a marine-type chain whose links have a section of diameter between 8 and 20 millimeters, intended to be used in the agricultural field. The sprocket includes a main cylindrical recess between two lateral flanges and a plurality of regularly spaced forks projecting radially from the recess, delineating housings intended for receiving every other link of the substantially flat chain. The flanges extend beyond the recess over a height substantially equal to the width of a link of the chain.

Claims

1. A driving sprocket for a marine-type chain whose links have a section of diameter between 8 and 20 millimeters, intended to be used in the agricultural field, the driving sprocket comprising: a main cylindrical recess between two lateral flanges, wherein said flanges extend beyond said recess on a height substantially equal to the width of a link of the chain; and a plurality of regularly spaced forks projecting radially from said recess, delineating housings configured to receive every other link of the chain in a position where the every other link is laid substantially flat, wherein each fork is made of two teeth and has two flanks with substantially parallel faces.

2. The driving sprocket according to claim 1, wherein said flanges extend beyond said recess over a height greater than or equal to 40 millimeters.

3. The driving sprocket according to claim 1, wherein the sprocket is made of steel.

4. The driving sprocket according to claim 1, wherein said forks are spaced apart by a distance substantially equal to that of a link of said chain.

5. The driving sprocket according to claim 1, wherein the two teeth are spaced apart by 15 to 30 millimeters.

6. The driving sprocket according to claim 5, wherein a secondary recess is formed in said main recess between the teeth of said forks.

7. The driving sprocket according to claim 1, further comprising a brake comprising a cylindrical shaft portion projecting from an outer face of one of said flanges, aligned with an axis of said sprocket.

8. The driving sprocket according to claim 1, further comprising a securing element with a driving shaft comprising an axial bore in which emerges a keyway.

9. The driving sprocket according to claim 2, wherein said flanges extend beyond said recess over a height greater than or equal to 50 millimeters.

Description

5. LIST OF FIGURES

(1) Other features and advantages of the invention will become evident on reading the following description of one particular embodiment of the invention, given by way of illustrative and non-limiting example only, and with the appended drawings among which:

(2) FIG. 1 is a perspective view of a scraper traction module presented with reference to FIG. 5;

(3) FIG. 2 is a side view of a driving sprocket for a marine chain according to the invention;

(4) FIG. 3 is a sectional view along section A-A of the driving sprocket shown with reference to FIG. 2;

(5) FIG. 4 is a detailed view of a fork of the driving sprocket shown in FIG. 2;

(6) FIG. 5 is a schematic perspective view of a manure and/or slurry scraper.

1. DETAILED DESCRIPTION OF THE INVENTION

(7) On FIG. 5, there is illustrated a scraper 550 fitting a barn 500 including a space of stalling 510 and a corridor 520.

(8) The scraper 550 is formed of a surfacer 560 driven in translation by a device 505, comprising two traction modules 100A and 100B complementary identical and a chain 160 fixed in its middle to the planer 560.

(9) The traction modules 100A and 100B are arranged at each end of the corridor 520 to clean. One of both traction modules 100A is intended to pull the plane 560 so that it pushes the garbage littering the corridor 520 towards a pit at one end 540 of the corridor, while the other module 100B is adapted to pull and thus bring the planer back to its original parking position 530, located at the other end of the corridor.

(10) During his displacement, the planer 560 is guided by a slider 565 cooperating with a guide recess 525 formed in the floor of the corridor 520. When one of the traction modules 100A or 100B is activated, it tows the planer while tensioning the part of chain 160 which is called a stretched strand 162, the second traction module 100 is inactive, allowing the chain part 163 forming a soft strand to run freely.

(11) Thus, whatever the direction of movement of the plane 560, it is pulled by either of the traction modules 100A or 100B.

(12) On FIG. 1, the traction module 100A has been represented in a detailed view.

(13) The traction module 100A comprises a chassis 150 mounted on a base 105, supporting at its top a geared motor 110 on the shaft of which is mounted a driving sprocket 200 arranged vertically to an idler pulley 130 and a chain box 140, also called tub.

(14) The pulley 130 is mounted on the base 105, substantially at ground level and is aligned with the guide recess 525 of the planer, formed in the floor of the corridor 520.

(15) The part of the chain 162, fixed to the planer, comes out of the guide recess 525 of the planer and the pulley 130 returns it to the sprocket 200. At the outlet of the sprocket 200, the chain portion 164 is stored in the tub 140.

(16) The pulley 130 has a guide recess 132 shaped to maintain the chain 160 in place at best. This recess 132 has a width substantially greater than that of a link in the chain 160 and a depth substantially equal to half the width of the link.

(17) To ensure that the chain 160 is properly pulled by the traction module 100A, the winding arc of the chain 160 around the sprocket 200 is greater than 90. Advantageously, this winding arc ranges between 120 and 180 and preferably between 145 and 180.

(18) Finally, to allow the dirty chain to drip during storage in the tub 140, the bottom 141 of the tub 140 is perforated and raised by feet 142. The perforated bottom 141 allows, in addition, the evacuation of rainwater which otherwise would accumulate in the tub 140 when the traction module 100A is located outside a building.

(19) To pull the planer 560 towards the end 540, a control module supplies electricity to the geared motor of the traction module 100A and switches off the power supply of the geared motor of the traction module 100B, which becomes inactive. Conversely, to return the planer 560 to the parking position 530, the control module cuts off the power supply of the geared motor of the traction module 100A and supplies power to the geared motor of the traction module 100B, which becomes active.

(20) According to one variation, a mechanical coupling, such as a clutch for example, is mounted between the motor shaft of the geared motor 110 and the shaft carrying the sprocket 200. This mechanical coupling can be made temporarily inactive and allows to engage or disengage the sprocket 200 of the geared motor according to whether the traction module carrying it is activated or not. Thus, when the sprocket is disengaged, it becomes idle and lets the chain slip away. On the contrary, when the sprocket is engaged, it rotates at the speed of the shaft of the geared motor and pulls the chain.

(21) On FIGS. 2 and 3, detailed views of a driving sprocket 200 are shown with which the traction modules 100A and 100B are fitted, with reference to FIG. 1, respectively from the side and in sectional view. The sprocket 200 is formed of a cylindrical hub, called a core 210 and two circular flanges 220, welded on the core 210 and delineating a first, also called main, recess 215.

(22) In this particular embodiment of the invention, the flanges 220 extend beyond said groove over a height 260 of 45 millimeters.

(23) To allow the engagement of the chain 160 by the sprocket 200, the flanges 220 comprise on the inside face 221 teeth 240 of radial orientation, spaced by a regular pitch. Both teeth 240 of the two flanges 220 are arranged facing each other, each pair of teeth forming a fork 249. Each tooth 240 of one of the forks 249 has a similar profile according to the axial orientation of the fixture, with a substantially constant width having two flanks with substantially parallel faces and rounded edges.

(24) The tooth 240 of the fork 249 shown in detail in FIG. 4 has a height h according to the radial distance between a foot circle corresponding to the diameter d.sub.f of the cylinder forming the core 210 and a tip circle diameter d.sub.a delineating the top of the tooth 240 of the fork 249. This height h of the tooth 240 of the range 249 comprises a protrusion height h.sub.a and a recess height h.sub.f.

(25) The recess height h.sub.f corresponds in the proximal part 244 of the tooth 240 of the fork 249 to a base 241 of constant thickness. At approximately mid-height, the tooth 240 of the fork 249 has a thickness attenuation 242. This recess 242 is the beginning of a portion 243 corresponding to the projecting height h.sub.a in which the thickness decreases regularly to the distal end of the tooth 240 of the fork 249. In addition, the distal end of the tooth 240 is tangent to the inner face 221 of the flange 220.

(26) The dimensions of the sprocket and the pitch between each tooth 240 of the forks 249 are based on the size of a mesh of the chain used. So, the thickness of the tooth 240 at the base 241 is such that between two teeth 240 facing the fork 249, there remains, perpendicular to the recess 230, a space of dimension substantially greater than or equal to the section of a link of the chain 160.

(27) To ensure good maintenance of the chain in the fixture and to prevent the chain from coming off as far as possible, the tooth 240 of the fork 249 further comprises substantially parallel flanks 241 and 242. In addition, the internal faces 221 of the flanges 220 are substantially parallel.

(28) Two successive forks 249 delimit a housing 250 for a link in the chain 160 to drive. The flanks 241 and 242 of the teeth 240 of the forks 249 then serve as a stop for the link of the chain 160 inserted into the housing, transmitting by contact the force produced by the geared motor to the chain 160 which is drawn.

(29) Thanks to the housing thus formed, the chain can twist in the fixture 200, without coming off and so be dragged farther by the sprocket 200. Similarly, driving is ensured even if the chain is completely stretched, under the effect of traction.

(30) To improve the engagement of the links of the chain in contact on the edge with the sprocket 200, a second recess 230 is formed on the core 210. This secondary recess 230 has a width dimension substantially greater than or equal to the section of a chain link and a depth substantially greater than or equal to half the section of a link.

(31) The centering of the sprocket 200 on the motor shaft of the geared motor is provided by a central bore 231 formed and machined in the core 210. This core 210 comprises, in the axial direction of the bore, a keyway 232 to maintain the rotation by keying the fixture 200 on the shaft of the geared motor.

(32) According to one variation, the core 210 of the sprocket 200 extends outside one of the flanges 220, along its axis, in the form of an outer cylindrical portion. This extension of the core makes it possible to equip the traction module with a brake in the form of a belt or a strap acting by friction on this outer cylinder.

(33) According to another variation, the assembly formed of the core 210 and flanges 220 is cast by moulding.

(34) The technique described above for making a driving sprocket for a chain can be used in different types of traction equipment or pulleys, for example to form a traction element of a chain of a lifting system or a docking system in a floating structure such as a ship, a platform or other.

(35) Although the invention has been described in connection with several particular embodiments, it is obvious that it is not limited thereto and that it comprises all the technical equivalents of the means described and their combinations if they are within the scope of the invention.