WINCH

Abstract: Winch for at least one line, preferably in the form of a textile band, which is capable of being wound onto a drum. The object of the present invention is to provide a winch from the drum of which the line may be moved out 360<o> in the horizontal plane. An other purpose is that the winch should be simple and robust, easy to mount and dis-mount, and that any necessary replacement of the line should be easy to perform. When required it should also be provided with simple devices for the determining the feed out line in reversible winches. These objects have been attend in that the drum (17, 18) is surrounded by a winch housing (20, 21) subdivided transversely of the rotational shaft (15) of the drum, and in that between the housing parts there is provided a slot (22) preferably extending around the hole housing an serving as a passage for the line (23).

Description: Winch The present invention relates to a winch for at least one line, preferably in the form of a textile band, which is capable of being wound onto a drum. Background of the invention A transport system used in lumbering comprises a reciprocating line which by means of an engagement member transports felled trees or logs out of the wood to the side of a road. The transport line will displace the log when the line is wound on the drum of a winch, whereas during the return movement of the line the engagement member will be disengaged from the band, so that no displacement of the load takes place. In the course of the felling of the trees the transport line will extend in different directions from, the winch, which has necessitated that the winch must be capable of swinging or of being swingably mounted, so that it can be adjusted to the new direction of the band. According to circumstances the band length may be from some 50 metres up to one or several kilometres. The feeding in and out of the band i.e. the transportating amplitude, amounts to 5-10 metres, in certain cases even up to 20 metres. This puts great demands on the band from the point of view of loading and wear, and especially on the side edges of the bands. In view of the winch being intended for use in lumbering, it must be resistant against sand and other impurities that may enter the drum together with the band, and the winch must therefore be of a robust and wear- resistant design, and it must further be impervious to conditions of weather and wind, especially frost. The objects and main characte istics of the invention The object of the present invention is to provide a winc o from the drum of which the line may be moved out 360 in th horizontal plane. Another purpose is that the winch shoul be simple and robust, easy to mount and dis-mount, and tha any necessary replacement may be easily made. When calle for, it should also be provided with simple devices t determine the length of line feed out in reversible winches These objects have been attained in that the drum i surrounded by a winch housing subdivided transversely of th rotational chart of the drum, and in that between th housing parts there is provided a slot preferably extendin around the whole housing and serving as a passage for th line. Descriptions of the drawings Fig. 1 is a section through the winch according to th invention. Pig. 2 is a section along the line II-II in fig. 1. Fig. 3 is a section along the line III-III in fig. 1. Description of an embodiment The winch according to the invention is built around a motor 11, for instance a hydraulic motor provided with a flange 1 for connection to a structural detail 13 intended to support the winch .14. The latter comprises a line drum 16 carried by the drive shaft 15 of the motor 11. In the embodiment shown the line drum is in a form of a differential drum which comprises an outer drum 17 and an inner drum 18. The differential drum 16 is surrounded by a housing 19 which is subdivided, transversely to the rotational shaft 15 of the drum, into two housing parts 20 and 21. Between the housing parts there is provided a slot 22 which preferably extends around the hole circumference of the circular housing 19. O The outer drum 17 of the differential drum 16, as well as the inner drum 18, has a length corresponding to the width of the band 23 and 24 respectiavely, to be wound onto the drums. The slot 22 between the housing parts 20 and 21 is preferably provided at half the height of the outer drum 27, so that the band 23 will be twisted 90 before its exit from the winch. The outer drum .16 is further provided with an axially in. cross section key-hole shaped groove 25 which opens at the periphery of the drum and which is intended for receiving one end of the band 23, said end being provided with an eye 26 wherein a pin 27 is inserted. The winch illustrated is intended to be driven intermittently in opposite directions of rotation, and in order to determine when a reversal is to take place the winch is provided with the second band 24 which has one end secured to the inner winch drum 18 in a similar way as the band 23 at the outer winch drum 17, i.e. in a key slot 28, whereas the opposite end of the band is secured to a bolt 29 provided in the fixed housing part 21. The two line drums 17 and 18 are separated from oneanother by means of a removable intermediate wall 30. The hydraulic motor 11 is connected to a hydraulic system which includes a pressure sensitive reversing valve which reverses the motor upon a certain pressure. This pressure is reached each time the band 24 has been completely wound up onto the line drum 18, so that temporarily the rotational movement of the hydraulic motor blocked causing the mentioned rise pressure in the system and thereby reversal of the motor. In the emobodiment shown the winch is provided with a differential drum 16 consisting of two line drums 17 and 18, but it. is of course possible to design the winch with only one line drum if some other type of measuring device of the - band length and of reversing the hydraulic motor is choosen.

Claims: CLAIMS 1. A winch for at least one line, preferably in the form of a textile band, which is capable of being wound onto a drum, S c h a r a c t e r i z e d i n t h a t, the drum(17,18) is surrounded by a winch housing (20,21) subdivided transversely of the rotational shaft (15) of the drum, and that between the housing parts there is provided a slot (22) , preferably extending around the hole housing and serving as a passage for the line (23) . 2. A winch according to claim 1, c h a r a c t e r i z e d i n t h a t, at least one of the housing parts (20) is non-rotatably connected with the drum (17) . 3. A winch according to claim 1 or 2, c h a r a c t e r i z e d i n t h a t, the rotational shaft (15) of the winch is arranged substantially vertically and the slot (22) between the housing parts (20,21) substantially horizontally. 4. A winch according to claim 1, 2 or 3, and intended for a reciprocatingly windable line (23) , c h a r a c t e r i z e d i n t h a t, the winch is provided with a differential drum (16) comprising a first drum (17) for an external line (23) and a second drum (18) for an internal line (24) , the latter being secured on the one hand to the second drum (18) and on the other hand to the fixed housing part (21) , and that the winch is provided with control means for reversing the winch motor (11) when the internal line (24) is completely wound onto the second drum (18) . OMPI

Inventors: BOGREN LEIF, BOGREN, LEIF
Applicants: BOGREN LEIF, BOGREN, LEIF
Application year: 1983
Main classification: B66D3
IPC codes: B66D1