Manual hoist

Abstract

Manual hoist with: - a drive wheel (5) which has a drive means engagement area (15), - a brake unit (20) with clutch function that interacts with the drive wheel (5) and is arranged in a brake chamber (54), - a transmission shaft (14) that can be rotated by the brake unit (20), - a gearbox (35) interacting with the gearbox shaft (14), - a load wheel (6) which can be rotated by the gearbox (35) and which is rotatably mounted in side plates (10a, 10b), - wherein the brake chamber (54) is delimited towards the drive element engagement area (15) of the drive wheel (5) by means of a stationary brake chamber cover (46), characterized in that the stationary brake chamber cover (46) is in sealing contact with the drive wheel (5) by means of a rotary seal (51), and that the drive wheel (5) has on its side facing the brake unit (20) a circumferential surface (52) concentric to the transmission shaft (14), which is designed as a sealing surface with which the rotary seal (51) is in sealing contact.

Description

[0001] The invention relates to a manual hoist according to the preamble of claim 1.

[0002] Such a hoist is known from DE 11 2006 000 681 B4. The hoist therein has a drive wheel, also called a handwheel, which can be rotated by means of a drive means in the form of a revolving chain. This rotary motion is transmitted via a brake unit, which also has a clutch function, to a gear shaft. From there, via a gear unit that reduces the rotary motion, it is transmitted to a load wheel. This wheel can move a load chain and lift a load suspended from the load chain.

[0003] To prevent the lifted load from rotating the hoist backward, the known brake unit is designed as a reverse rotation brake, which includes a ratchet wheel located in the area of ​​the brake unit. The ratchet wheel engages a stationary pawl in such a way that it can only be rotated in one direction.

[0004] In this known hoist, the area or space in which the brake unit is located (hereinafter referred to as the "brake chamber") is only separated from the space in which the drive wheel is located by an overlap of an annular groove-shaped housing diameter step with an outer edge area of ​​the drive wheel. As a result, the brake chamber is not shielded from the environment to such an extent that dirt and abrasion from the brake chamber can enter the outside environment, or conversely, dirt and dust from the environment can enter the brake chamber. In environments where extreme cleanliness is essential, for example in explosive environments, clean rooms or in the food industry, such hoists are therefore often not suitable for use. A further disadvantage is that it cannot be ruled out that water, for example rainwater or water from cleaning the hoist, can penetrate into the brake chamber.

[0005] US 2017 / 0 174 483 A1 discloses a manual hoist in which the brake chamber and the chamber within the housing in which the drive wheel is located openly merge into one another.

[0006] DE 24 22 959 A discloses a manual hoist with a brake wheel cover in the form of a partition wall extending radially inward from the peripheral wall of a drive wheel cover between the drive wheel and the brake wheel. In this known hoist, too, dirt, water, etc., can penetrate the brake chamber from the outside or from there into the environment.

[0007] The invention is therefore based on the object of creating a manual hoist of the type mentioned at the outset which reliably prevents dirt and abrasion from the brake chamber from entering the external environment or dirt, dust and liquids from the environment from entering the brake chamber.

[0008] This object is achieved according to the invention by a manual hoist having the features of claim 1. Advantageous embodiments of the invention are described in the further claims.

[0009] The hoist according to the invention according to claim 1 comprises: - a drive wheel having a drive means engagement area, - a brake unit with clutch function cooperating with the drive wheel, which is arranged in a brake chamber, - a gear shaft that can be rotated by the brake unit, - a gear interacting with the gear shaft, - a load wheel that can be rotated by the gearbox and is rotatably mounted in side plates, - the brake chamber is separated from the drive engagement area of ​​the drive wheel by means of a stationary brake chamber cover, - wherein the stationary brake chamber cover is in tight contact with the drive wheel by means of a rotary seal, and - wherein the drive wheel has, on its side facing the brake unit, a circumferential surface concentric with the transmission shaft, which is designed as a sealing surface with which the rotary seal is in sealing contact.

[0010] The term “drive means engagement area” refers to an area of ​​the drive wheel which is designed to engage with a drive means, in particular a manually operable chain.

[0011] In the hoist according to the invention, the brake chamber is sealed particularly reliably from the environment, so that emissions into the environment as well as the ingress of dirt, dust, liquids and moisture can be reliably prevented. This is achieved by means of a rotary seal, i.e. a seal that is attached to a stationary part, in particular to a side plate, and seals against the drive wheel. The circumferential surface of the drive wheel is designed as a sealing surface, which can be designed very precisely in a relatively simple manner and in such a way that the drive wheel can not only be rotated, but also moved in the axial direction on the gear shaft without the sealing effect between the brake chamber cover and the drive wheel being impaired.

[0012] The rotary seal is conveniently attached to the brake chamber cover.

[0013] Preferably, the sealing surface is formed by the wall surface of an annular groove that extends axially into the drive wheel. This creates a very space-saving arrangement. However, it is also conceivable to provide a concentric, circumferential annular land on the drive wheel that projects axially into the brake chamber and has the circumferential sealing surface against which the seal rests.

[0014] The brake chamber cover is preferably plate- or cup-shaped and secured to the side plate by a circumferential stationary seal located at its outer edge. This stationary circumferential seal thus also represents a contact seal, which can be used to seal the brake chamber particularly effectively.

[0015] Preferably, the hoist has a drive wheel housing in which the drive wheel is arranged, with the brake compartment cover being clamped to a side plate by means of the drive wheel housing. This allows the brake compartment cover to be attached to the side plate in a simple manner and without additional fastening means.

[0016] Preferably, the drive gear is in sealing contact with the transmission shaft by means of an additional rotary seal. This allows the area between the drive gear and the transmission shaft to be sealed particularly effectively.

[0017] Preferably, the additional rotary seal is secured to the drive gear, with the transmission shaft having a peripheral surface configured as a sealing surface against which the additional rotary seal rests. Such a sealing surface can be configured very precisely and relatively easily in such a way that the drive gear can not only be rotated but also moved axially on the transmission shaft without impairing the sealing effect between the drive gear and the transmission shaft.

[0018] Alternatively, it is also possible to fix the additional rotary seal to the gear shaft and to provide a circumferential sealing surface on the drive wheel with which the seal is in sealing contact.

[0019] Preferably, the gearbox is housed in a cup- or plate-shaped gearbox housing, which is in sealing contact with a side plate via a stationary seal running around the edge. This also reliably prevents emissions from the gearbox housing into the environment and the ingress of dirt, dust, liquids, and moisture into the interior of the gearbox housing.

[0020] Preferably, the rotary seal and / or the additional rotary seal consists of a shaft seal. Other seal designs are readily possible.

[0021] The invention is explained in more detail below with reference to the drawings. They show: Fig. 1: a front view of a hoist according to the invention with chains shown in abbreviated form, Fig. 2: a side view of the hoist from Fig. 1, and Fig. 3: a cross-section of the hoist.

[0022] The Fig. 1 and Fig. 2 show a manual hoist 1 with a hoist base part 2, which can be suspended from an upper support structure, also not shown, via an upper hook 3 and, for example, via a chain (not shown).

[0023] The hoist 1 is driven by a rotating, manually operable drive chain 4, which is guided over a drive wheel 5, also called a handwheel, and is positively engaged therewith in a known manner such that the drive wheel 5 is rotated by pulling on the drive chain 4.

[0024] The rotation of the drive wheel 5 is transmitted with a rotational speed reduction in a manner described in more detail below to a load wheel 6 which is positively engaged with a load chain 7 in such a way that the rotation causes a lifting movement of a free end section 7a of the load chain 7.

[0025] A load hook 8 for suspending an object (not shown) is attached to the free end section 7a of the load chain 7. An opposite end section 7b of the load chain 7 is secured to the hoist base part 2 via a fastening link 9 and transitions via a loop into an intermediate section 7c leading to the load wheel 6.

[0026] Based on Fig. 3 the structure of the hoist base part 2 is described in more detail below.

[0027] The hoist base part 2 has two parallel, spaced-apart support or side plates 10a, 10b. During operation, the two side plates 10a, 10b are arranged vertically. The upper hook 3 is attached to the side plates 10a, 10b in a manner not shown in detail, with a lower attachment portion of the upper hook 3 engaging in an upper space between the side plates 10a, 10b.

[0028] The load wheel 6 is rotatably mounted in the side plates 10a, 10b by means of bearings 11a, 11b. A load chain engagement area 12 of the load wheel 6, into which the load chain 7 positively engages, is arranged in the space 13 between the side plates 10a, 10b.

[0029] The load wheel 6 can be rotated via the drive wheel 5, which is mounted on a gear shaft 14. The drive wheel 5 has a radially outer circumferential region designed as a drive means engagement region 15, which positively engages with a drive means, ie, in the present embodiment, with the drive chain 4. By pulling on the drive chain 4, the drive wheel 5 is rotated.

[0030] The drive gear 5 comprises a radially inner region with a central bore 16 through which the gear shaft 14 extends and which has an internal thread 17. This internal thread 17 meshes with an external thread 18 of the gear shaft 14, which is arranged on a threaded portion 19 and is preferably designed as a steep thread. This causes the drive gear 5 to also move in the axial direction of the gear shaft 14 when rotating relative to the gear shaft 14.

[0031] The rotational movement of the drive wheel 5 can be transmitted to the gear shaft 14 via a brake unit 20, which is designed as a reverse rotation brake and additionally has a clutch function. For this purpose, the brake unit 20 has a brake base part 21, two brake discs 22, and a disc-shaped ratchet wheel 23 arranged between the two brake discs 22.

[0032] The brake base part 21 is screwed in an end region of the threaded section 19 onto the external thread 18 of the gear shaft 14 until it rests against a radial shoulder 24 of the gear shaft 14 and is thus fixed in a rotationally fixed manner in the screwing direction.

[0033] The two brake discs 22 and the ratchet wheel 23 are rotatably mounted on a cylindrical base section 25 with a reduced diameter. If the drive wheel 5 is rotated by means of the drive chain 4 and thereby moved along the gear shaft 14 in the direction of the brake unit 20, an axially projecting coupling section 26 of the drive wheel 5 exerts an axial compressive force on the two brake discs 22 and the ratchet wheel 23, by means of which the brake discs 22 and the ratchet wheel 23 are pressed together and frictionally pressed against a radially projecting driver section 27 of the brake base part 21. As a result, a frictional connection is established between the drive wheel 5 and the brake base part 21, due to which the brake base part 21 is rotationally fixedly coupled to the drive wheel 5 and the gear shaft 14 is rotated accordingly.

[0034] If, however, the drive wheel 5 is rotated in the opposite direction and moved away from the brake unit 20 along the gear shaft 14, the frictional connection in and with the brake unit 20 is released. The load hook 8 can be lowered.

[0035] The ratchet wheel 23 has a toothing 32 on its outer circumference, which engages with a pawl (not shown) mounted on the side plate 10a in such a way that the ratchet wheel 23 can be rotated in a specific direction, while rotation in the opposite direction is blocked by the pawl. As a result, when the brake unit 20 is compressed, the rotational force of the drive wheel 5 can be transmitted to the gear shaft 14 to lift the load hook 8, while rotation in the opposite direction is blocked, so that the lifted load cannot rotate the hoist in reverse.

[0036] The axial movement of the drive wheel 5 along the transmission shaft 14 away from the brake unit 20 is limited by a stop disc 28, which sits on a cylindrical portion 29 of the transmission shaft 14. The stop disc 28 is secured to the adjacent end of the transmission shaft 14 by a nut 30, which is screwed onto a threaded portion 31 at the end of the transmission shaft 14.

[0037] The gear shaft 14 penetrates a central bore 33 of the load wheel 6 and is rotatably mounted therein by means of bearing sleeves 34a, 34b. The gear shaft 14 can thus rotate relative to the load wheel 6.

[0038] The rotary movement of the gear shaft 14 is reduced by a gear 35 which is located laterally outside the side plate 10b within a gear housing 36.

[0039] The gear 35 comprises a first small gear 37, which is connected in a rotationally fixed manner to an end region 38 of the gear shaft 14. This small gear 37 meshes with two equally sized gears 39, of which, due to the sectional view of Fig. 3 only the rear gear 39 is shown. The two large gears 39 are on in Fig. 3 not visible gear shafts, which are rotatably mounted on the one hand in a bearing plate 40 fastened to the gear housing 36 and on the other hand in the carrier plate 10b.

[0040] A second small gear 41 is fixedly mounted on each gear shaft, with the two gears 41 engaging a third large gear 42 on opposite sides. This gear 42 is mounted non-rotatably on a sleeve-shaped drive section 43 of the load wheel 6, which extends into the gear chamber 44 enclosed by the gear housing 36, allowing the load wheel 6 to be driven.

[0041] With the help of this gear 35, the rotational movement of the gear shaft 14 is transmitted to the load wheel 6 with a strong reduction ratio. Reduction means that the load wheel 6 rotates significantly slower than the gear shaft 14 or the drive wheel 5, while at the same time, the load that can be lifted by the load chain 7 is correspondingly increased compared to the force applied to the drive chain 4.

[0042] The drive wheel 5 is covered on the upper side and in the area of ​​the outer side of the hoist base part 2 by a drive wheel housing 45, while the Fig. 2 and Fig. 3 front and rear sides of the hoist base part 2 are largely open and have chain outlet openings through which the drive chain 4 can pass.

[0043] In order to prevent abrasion, dirt or dust from the area of ​​the brake unit 20 from entering the environment of the hoist 1 or, conversely, dirt, dust, water, moisture, etc. from the external environment from entering the area of ​​the brake unit 20, the brake unit 20 is sealed from the environment by means of a stationary brake chamber cover 46.

[0044] The brake chamber cover 46 is plate- or cup-shaped and has an outer circumferential edge region 47 and an inner circumferential edge region 48, which defines a central axial opening 49. The coupling section 26 of the drive wheel 5 passes through the opening 49.

[0045] The brake chamber cover 46 is tightly connected to the side plate 10a by its outer edge region 47. Sealing is preferably achieved by means of a circumferential stationary seal 50, which is clamped between the side plate 10a and the outer edge region 47 and can in particular be a flat seal.

[0046] The inner edge region 48 of the brake chamber cover 46 is sealed from the drive gear 5 by means of a rotary, circumferential seal 51. For this purpose, the drive gear 5 has a circumferential surface 52 concentric with the transmission shaft 14, which is designed as a sealing surface. The rotary seal 51 is fixed to the inner edge region 48 and rests sealingly on the circumferential surface 52 with a sealing lip.

[0047] The circumferential surface 52 is formed by a boundary wall of an annular groove 52, which is introduced into the drive wheel 5 from the side of the brake unit 20. The inner edge region 48 of the brake chamber cover 46 and the rotary seal 51 can thus be arranged at least predominantly within the annular groove 52 and thus within the outer contour of the drive wheel 5, which enables a space-saving design.

[0048] Furthermore, the annular groove 52 and thus the rotary seal 51 are located, viewed in the radial direction, between the coupling section 26 and the drive means engagement area 15 of the drive wheel 5.

[0049] By means of the brake chamber cover 46, the chamber in which the brake unit 20 is located, which is referred to here as the brake chamber 54, is delimited and sealed from the drive means engagement area 15.

[0050] The brake chamber 54 is essentially delimited by the side plate 10a, the stationary seal 50, the brake chamber cover 46, the rotary seal 51, the part of the drive wheel 5 lying radially inside the circumferential surface 52, the gear shaft 14, the bearing sleeve 34a, a load wheel bearing section 55 and the bearing 11a.

[0051] To seal the threaded area between the drive gear 5 and the threaded portion 19 of the transmission shaft 14, a further rotary seal 56 is provided in the region of the end face of the drive gear 5 remote from the brake chamber 54. This further seal 56 is secured in a recess of the drive gear 5 and, by means of a sealing lip, is in sealing contact with a transmission shaft circumferential surface 63, which in the illustrated embodiment is formed by the cylindrical portion 29 of the transmission shaft 14.

[0052] The gear chamber 44 is also sealed from the external environment. For this purpose, a circumferential stationary seal 57, preferably designed as a flat seal, is provided, which is arranged and clamped between an outer circumferential edge region 58 of the gear housing 36 and the side plate 10b.

[0053] As further evidenced by the Fig. 1 and Fig. As can be seen in Figure 3, the hoist base part 2 is held together by means of three axial bolts 59, which are arranged parallel to the gear shaft 14 in the edge area of ​​the hoist base part 2. The axial bolts 59 penetrate the drive wheel housing 45, the brake chamber cover 46, the two side plates 10a, 10b, and the gear housing 36. Furthermore, the axial bolts 59 have threaded pins 60a, 60b on both ends, which protrude outward beyond the drive wheel housing 45 and the gear housing 36, respectively. Nuts 61a, 61b are screwed onto the threaded pins 60a, 60b, with which the intermediate elements are clamped together.

[0054] As from Fig.As can be seen in Figure 3, the circumferential edge 62 of the drive gear housing 45 rests on the outer edge region 47 of the brake chamber cover 46. In this way, the brake chamber cover 46 can be pressed against the seal 50 and secured to the side plate 10a by means of the drive gear housing 45, the axial bolts 59, and the nuts 61a, 61b. By screwing the nut 61b onto the threaded pin 60b, the seal 57 is clamped between the side plate 10b and the edge region of the transmission housing 36.

[0055] For practical purposes, the rotary seals 51 and 56 are made of Simmering rings. However, other types of seals are readily possible.

[0056] A special corrosion resistance can be achieved if at least all metal parts surrounding the hoist base part 2 are made of stainless steel.

[0057] The described hoist 1 can be varied in many ways within the scope of the invention. For example, it is possible not to seal the brake compartment cover 46 in its outer edge region 47 using a stationary seal 50, but to attach the outer edge region 47 tightly to the side plate 10a in another way, for example, by means of a welded connection.

[0058] Instead of the annular groove 53, a cylindrical annular web concentric with the gear shaft 14 can also protrude beyond the outer contour of the drive wheel 5 on the drive wheel 5, on which the sealing surface is formed with which the rotary seal 51 is in sealing contact.

[0059] The brake chamber cover 46 does not have to be pressed against the stationary seal 50 or side plate 10a by means of the drive wheel housing 45, but can be fastened to the side plate 10a independently of the drive wheel housing 45, in which case the circumferential edge 62 of the drive wheel housing 45 is then expediently clamped directly against the side plate 10a.

Claims

[1] Manual hoist with: - a drive wheel (5) having a drive means engagement area (15), - a brake unit (20) with a clutch function, which cooperates with the drive wheel (5) and is arranged in a brake chamber (54), - a gear shaft (14) which can be rotated by the brake unit (20), - a gear (35) cooperating with the gear shaft (14), - a load wheel (6) which can be rotated by the gear (35) and which is rotatably mounted in side plates (10a, 10b), - wherein the brake chamber (54) is delimited from the drive means engagement area (15) of the drive wheel (5) by means of a stationary brake chamber cover (46), characterized bythat the stationary brake chamber cover (46) is in sealing contact with the drive wheel (5) by means of a rotary seal (51), and that the drive wheel (5) has, on its side facing the brake unit (20), a circumferential surface (52) which is concentric with the gear shaft (14) and is designed as a sealing surface with which the rotary seal (51) is in sealing contact. [2] Manual hoist according to claim 1, characterized by that the sealing surface is formed by a wall surface of an annular groove (53) which extends axially into the drive wheel (5). [3] Manual hoist according to one of the preceding claims, characterized by that the brake chamber cover (46) is plate-shaped or cup-shaped and is fixed to the side plate (10a) by means of a circumferential stationary seal (50) arranged in its outer edge region (47). [4] Manual hoist according to one of the preceding claims, characterized bythat the hoist (1) has a drive wheel housing (45) in which the drive wheel (5) is arranged, wherein the brake chamber cover (46) is clamped to a side plate (10a) by means of the drive wheel housing (45). [5] Manual hoist according to one of the preceding claims, characterized by that the drive wheel (5) is in sealing contact with the gear shaft (14) by means of a further rotary seal (56). [6] Manual hoist according to claim 5, characterized by that the further rotary seal (56) is fixed to the drive wheel (5) and the gear shaft (14) has a gear shaft circumferential surface (63) which is designed as a sealing surface against which the further rotary seal (56) rests. [7] Manual hoist according to one of the preceding claims, characterized bythat the gear (35) is arranged in a cup-shaped or plate-shaped gear housing (36) which is in sealing contact with a side plate (10b) via a stationary seal (57) running around the edge. [8] Manual hoist according to one of the preceding claims, characterized by that the rotary seal (51) consists of a shaft seal. [9] Manual hoist according to one of claims 5 to 8, characterized by that the further rotary seal (56) consists of a shaft seal.

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