JP5541302B2 - Construction machine front guard device - Google Patents

Description

  The present invention relates to a front guard device that protects the front surface of a cabin (cab) from falling rocks or the like in construction machines such as excavators.

  For example, in an excavator, an upper window and a lower window are provided in front of the cabin, and an upper front guard that covers the upper part of the cabin front including the upper window from the outside, and a lower front guard that covers the lower part of the cabin front including the lower window from the outside. Thus, a front guard device for protecting the cabin front surface from falling rocks or the like is configured.

  Hereinafter, the upper front guard is referred to as “upper guard” and the lower front guard is referred to as “lower guard”.

  Each of the upper and lower guards has a lattice structure in which a lattice portion composed of vertical and horizontal bars is provided inside a guard frame having a square frame shape, and is attached to the front surface of the cabin via a bracket.

  Of these, the upper guard is pivotally mounted with the left and right sides as a fulcrum for cleaning the upper window, and the upper guard is closed on both the upper and lower sides on the opposite side (free end). A locking device for locking and a stopper device for receiving a forward load acting on the front surface of the front guard while elastically urging the guard in the opening direction to prevent rattling of the locking device are provided (patented) Reference 1).

  For example, the locking device is configured such that a retaining ring provided on the guard side is hooked on a hanging metal fitting provided on the cabin side, and an operator manually rotates the lever to tighten it.

  On the other hand, the stopper device is configured to elastically abut the stopper receiver provided on the guard side against the rubber stopper receiver provided on the cabin side.

JP 2008-82113 A

  The locking device and the stopper device mounted on the upper guard are required to be as compact and occupy as little as possible so as not to obstruct the view from the cabin as much as possible during traveling.

  However, according to the above known technique, since the locking device has a tightening structure with a lever, the entire device is increased in size by the lever, and the occupied space of both devices is increased together with the stopper device.

  Moreover, since the lever and the space for its rotation range are required, the lever protrudes from the one lattice on the guard free end side.

  For this reason, both the lock and stopper devices greatly hinder the view from the cabin.

  In addition, since the locking device and the stopper device are arranged apart from each other, in other words, when a load is applied to the guard from the front, the load receiving action by the stopper device is performed at a position away from the locking device, so the load Due to the damage of the lock device, the device could be damaged.

  Accordingly, the present invention provides a front guard for a construction machine that can consolidate the locking device and the stopper device in a compact space and can be arranged in a small space to improve visibility from inside the cabin and reduce damage to the locking device due to a forward load. A device is provided.

As means for solving the above problem, in the present invention, the front guard having a lattice structure having a plurality of lattices by vertical members and cross members covers the front side of the cabin from the outside with the left and right sides as fulcrums with respect to the front side of the cabin. A locking device that can be freely opened and closed between a closed state and an open state that opens the front of the cabin, and that locks the front guard in a closed state at an end opposite to the opening / closing fulcrum of the front guard, and the closing In the cabin front guard device in which a stopper device that receives a forward load acting on the front surface of the front guard while elastically urging the front guard in the opening direction is provided, the lock device includes one of the front guard and the cabin. And a rotary lever provided on the other side so that the striker is automatically engaged and locked when the front guard is closed. Comprising a switch mechanism, the stopper device includes a stopper provided on one of the front guard and the cabin, and a stopper receiving provided on the other so as to abut on the stopper before the guard closed state, the locking device And the stopper device is provided in a state of being located in one common lattice in the front view of the front guard.

  According to this configuration, the locking device is made compact by configuring it with a rotary latch mechanism and a striker, and on top of that, together with the stopper device, it is housed in one lattice, so that the space occupied by both devices can be reduced. And, since there is no protruding portion like a lever in the known art, visibility from inside the cabin can be improved.

  In addition, since the locking device and the stopper device are arranged in one lattice, that is, the load receiving action by the stopper device is exerted near the locking device, the damage of the locking device due to the forward load is reduced, Damage can be prevented.

  In the present invention, the upper locking device and the lower stopper device are arranged at the upper end portion of the free end portion of the front guard, and the lower locking device and the lower stopper device are arranged at the lower end portion within one lattice in the front view. It is desirable to provide them (claim 2).

  According to this configuration, in the front guard device in which the locking device and the stopper device are provided on both the upper and lower sides of the free end portion, it is possible to obtain an improvement in visibility and an effect of reducing damage to the locking device on both the upper and lower sides.

  In the present invention, it is desirable that a bracket is provided on the cabin side, and that one of the latch mechanism and the striker constituting the locking device and one of the stopper and the stopper receiver constituting the stopper device are provided on the bracket. Item 3).

  According to this configuration, since the bracket can be shared by the lock device and the stopper device, the structure can be simplified, the cost can be reduced by reducing the number of parts, and further compactness can be realized, and both the lock and stopper devices can be brought closer together. The damage reduction effect of the locking device is higher.

  According to the present invention, the lock device and the stopper device can be compactly integrated and arranged in a small space, the visibility from the cabin can be improved, and damage to the lock device due to the forward load can be reduced.

It is a perspective view of the guard closed state of the cabin provided with the front guard device concerning the embodiment of the present invention. It is a perspective view of a guard open state same as the above. FIG. FIG. It is the VV line expanded sectional view of FIG. It is the VI-VI line expanded sectional view of FIG. FIG. 5 is an enlarged view of a round enclosure portion in FIG. 4. FIG. 5 is an enlarged view of a round enclosure b portion of FIG. 4. It is a perspective view by the side of the cabin of a lower locking device. It is a perspective view by the side of the guard of a lower locking device.

  An upper window 1a and a lower window 1b (symbols are attached only to FIGS. 2 and 3) are provided on the front surface of the cabin 1, and the cabin front is defined by an upper guard 2 that covers the upper window 1a and a lower guard 3 that covers the lower window 1b. A front guard device is provided to protect against falling rocks.

  Both the upper and lower guards 2 and 3 have a lattice structure in which lattice portions 6 and 7 formed of vertical and horizontal bars are provided in guard frames 4 and 5 having a square frame shape.

  Among these, the lower guard 3 is attached to the lower part of the front surface of the cabin via the lower guard mounting bracket 8 at both left and right ends.

On the other hand, the upper guard 2 is provided with upper and lower hinges 9 and 10 at one end on the left and right sides (usually the left end in FIGS. 1 to 3 at the right end when viewed from the cabin as shown in the figure. The upper window 1a is cleaned and maintained with the upper guard 2 opened as shown in FIG.

Upper and lower locking devices 11 and 12 for locking the upper guard 2 in a closed state, and upper and lower stopper devices 13 and 14 (on the upper and lower sides opposite to the open / close fulcrum of the upper guard 2)
(See FIGS. 7, 8, and 10).

  The upper and lower locking devices 11 and 12 have the same principle configuration as a known locking device that locks the engine hood of the vehicle to the vehicle body, for example, as shown in an enlarged view in FIGS. A gate-type striker 15 attached to the front side, a rotary latch mechanism 16 provided on the upper guard 2 so as to be engaged with the striker 15 in a closed state and locked, and the striker 15. An unlocking mechanism for releasing the engagement of the latch mechanism 16 (only the unlocking lever 17 is shown in the figure) is provided.

  Since the locking devices 11 and 12 themselves are well known, a detailed structure is omitted in the drawing, and only a schematic configuration is shown.

  The upper guard 2 is locked in the closed state by the upper and lower locking devices 11 and 12.

  Here, as shown in FIG. 5, the striker 15 of the upper locking device 11 protrudes forwardly through an striker mounting member 18a on an upper bracket 18 that is detachably attached to the upper part of the front surface of the cabin by bolting or the like. Yes.

  On the other hand, the striker 15 of the lower locking device 12 protrudes forward from the lower bracket 19 as shown in FIGS.

  The lower bracket 19 is detachably attached to the lower guard mounting bracket 20 for attaching the upper right side of the lower guard 3 to the front of the cabin by bolting or the like.

  Since the lower bracket 19 also serves as a stopper receiver as will be described later, the lower bracket 19 has a closed cross-sectional structure in which the four circumferences are closed in order to ensure high strength.

  As shown in FIGS. 7 and 8, the upper and lower stopper devices 13 and 14 are provided with rubber stoppers 21 protruding rearward on the upper guard 2 side at substantially the same height level as the locking devices 11 and 12, respectively. As shown in FIG. 7 for the upper stopper device 13, the stopper 21 is attached to the upper bracket 18 (the striker mounting member 18 a) to which the striker 15 of the upper locking device 11 is attached, and the lower stopper device 14 is shown in FIG. 8. And the lower bracket 19 to which the lower striker 15 is attached.

  The upper and lower stopper devices 13 and 14 receive a forward load that acts on the front surface of the upper guard 2 due to falling rocks and the like while the upper guard 2 is elastically biased in the opening direction when the upper guard is closed.

  That is, the stopper devices 13 and 14 perform a vibration damping function that suppresses rattling of the lock devices 11 and 12 due to mechanical vibrations and a load receiving function.

  In this front guard device, the upper and lower locking devices 11 and 12 and the stopper devices 13 and 14 are provided so as to fit within a common grid when the upper guard 2 is viewed from the front (FIG. 3). Etc.).

  That is, both the upper lock and stopper devices 11 and 13 are arranged in the upper left corner lattice A of the guard frame 4 and the lattice portion 6 constituting the upper guard 2, and both the lower lock and stopper devices 12 and 14 are arranged on the guard frame 4 and the lattice. It is provided in the lattice B in the lower left corner of the part 6 so as to fit in the front view.

  As described above, the upper and lower locking devices 11 and 12 are made compact by being composed of the rotary latch mechanism 16 and the striker 15, and then one common grid A and each of the stopper devices 13 and 14 are formed. Since it is housed in B, the space occupied by the locking devices 11 and 12 and the stopper devices 13 and 14 can be reduced, and there is no protruding portion like a lever in the known technology, so that the visibility from the cabin is improved. Can do.

  The upper and lower brackets 18 and 19 are detachable and can be removed from the cabin 1 when the upper guard 2 is removed. In other words, the upper guard is removed and nothing is left on the cabin side. Therefore, the field of view when working with the upper guard removed is improved.

  On the other hand, since the locking devices 11 and 12 and the stopper devices 13 and 14 are arranged in one upper and lower lattices A and B, that is, the load receiving action by the stopper devices 13 and 14 is close to the locking devices 11 and 12. As a result, damage to the locking devices 11 and 12 due to the forward load can be reduced and the damage can be prevented.

  In this case, in the front guard device in which the locking devices 11 and 12 and the stopper devices 13 and 14 are provided on both the upper and lower sides of the free end portion of the upper guard 2 as in this embodiment, the upper and lower sides are arranged in the same lattice A and B. Therefore, it is possible to obtain an improvement in visibility on both the upper and lower sides and a damage reduction effect of the locking device.

Further, attaching the striker 15 of the upper and lower locking devices 11 and 12 to the bracket 18, 19, the bracket 18, 19 for taking the structure to act as a stopper receiving a stopper device 13, in other words, one of the bracket 18 and 19 are shared by the locking devices 11 and 12 and the stopper devices 13 and 14, so that the structure can be simplified, the cost can be reduced by reducing the number of parts, and further downsizing can be realized. 11 and 12 and the stopper devices 13 and 14 can be arranged closer to each other, so that the damage reduction effect of the lock devices 11 and 12 is higher.

  The latch mechanism 16 and the stopper 21 on the upper guard side are also attached to the common brackets 22 and 23 (see FIGS. 5, 6 and 10).

Other embodiments
(1) In the above-described embodiment, the upper and lower brackets 18 and 19 for attaching the striker 15 are used as stopper receivers. However, the stopper receivers may be formed by separate members from the brackets 18 and 19. .

  (2) Contrary to the above embodiment, the striker 15 of the locking devices 11 and 12 may be provided on the upper guard side, and the latch mechanism 16 may be provided on the cabin side.

  Similarly, the stopper 21 of the stopper devices 13 and 14 may be provided on the cabin side, and the stopper receiver may be provided on the upper guard side.

  (3) In the above-described embodiment, it is assumed that the upper guard 2 and the lower guard 3 are separately provided. The present invention is an integrated front guard that covers the entire cabin front surface with a single openable front guard. It can also be applied to devices.

DESCRIPTION OF SYMBOLS 1 Cabin 2 Upper front guard 3 Lower front guard 4 Guard frame 6 Lattice part A, B Lattice 8 Lower guard mounting bracket 9, 10 Hinge 11 Upper lock device 12 Lower lock device 13 Upper stopper device 14 Lower stopper device 15 Striker 16 Same as above, Latch mechanism 17 Same as above, Lock release levers 18 and 19 Upper and lower brackets also serving as stopper receivers 18a Striker mounting member 21 Stopper

Claims (3)

The front guard, which has a lattice structure with multiple lattices by vertical and cross members, is between the closed state that covers the front of the cabin from the outside and the open state that opens the front of the cabin with the left and right sides as fulcrums with respect to the front of the cabin At the end opposite to the opening / closing fulcrum of the front guard, a locking device that locks the front guard in the closed state and elastically biases the front guard in the opening direction in the closed state However, in the cabin front guard device provided with a stopper device that receives a forward load acting on the front surface of the front guard, the locking device includes a striker provided on one of the front guard and the cabin, and the front guard closed state. A rotary latch mechanism provided on the other side so that the striker is automatically engaged and locked, and the stopper device includes the front guard While a stopper provided on the cabin front and a stopper support provided on the other so as to abut on the stopper in a guard closed state, the locking device and the stopper device, common in a front view of the front guard A front guard device for a construction machine, which is provided in a state of being located within one lattice.   An upper locking device and an upper stopper device are provided at the upper end of the free end portion of the front guard, and a lower locking device and a lower stopper device are provided at the lower end of the front guard in a state of being located within a common lattice in front view. The front guard device for a construction machine according to claim 1.   2. The bracket according to claim 1, wherein a bracket is provided on the cabin side, and one of a latch mechanism and a striker constituting the lock device and one of a stopper and a stopper receiver constituting the stopper device are provided on the bracket. Front guard device for construction machinery.

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