CN113216748B

CN113216748B - Cabinet lock

Info

Publication number: CN113216748B
Application number: CN202110669323.XA
Authority: CN
Inventors: 吕建忠; 乔建爽; 宋哲
Original assignee: Henan Chuan Tong Electronic Technology Co ltd
Current assignee: Henan Chuan Tong Electronic Technology Co ltd
Priority date: 2021-06-16
Filing date: 2021-06-16
Publication date: 2022-08-16
Anticipated expiration: 2041-06-16
Also published as: CN113216748A

Abstract

The invention discloses a cabinet lock, which comprises a lock shell, a rotary pull arm, a lock cylinder and a motor assembly, wherein the lock shell is provided with a lock shell cavity for pulling up and containing the rotary pull arm, the first end of the rotary pull arm is rotatably connected with a rotating shaft, the rotating shaft is used for connecting a lock bolt, the lock cylinder is arranged at the second end of the rotary pull arm, the motor assembly is arranged in the lock shell, the motor assembly comprises a driving motor and a locking block which is driven by the driving motor and moves, the lock cylinder comprises a lock tongue, and the lock tongue is used for locking or unlocking with the locking block. This cabinet lock can realize that key machinery unblanks and motor is long-range unblanks, still has small simultaneously, and structural integration degree is high, and the space occupies less advantage.

Description

Cabinet lock

Technical Field

The invention belongs to the field of locks, and particularly relates to a cabinet lock.

Background

Most of the existing cabinet locks are manually unlocked and locked by keys, the unlocking mode is single, and unlocking or locking operation cannot be timely carried out when the keys are lost or lock cylinders break down, so that inconvenience is caused.

Meanwhile, the existing lock is large in size, the integration degree of the lock structure is low, and the problem that the whole lock occupies too much installation space is also considered.

Therefore, how to realize the key mechanical unlocking and the motor remote unlocking of the cabinet lock, the structural integration degree of the cabinet lock is improved, the material and the cost are reduced, the size is small, and the occupied space is small, so that the technical problem needs to be solved by technical personnel in the technical field.

Disclosure of Invention

The invention mainly solves the technical problem of providing a cabinet lock, and solves the problems that the cabinet lock in the prior art cannot be unlocked mechanically and doubly by a motor, and meanwhile, the cabinet lock is large in size, large in occupied space and low in structural integration degree.

In order to solve the technical problems, the invention adopts the technical scheme that a cabinet lock is provided, and the cabinet lock comprises a lock shell, a rotary pull arm, a lock cylinder and a motor assembly, wherein the lock shell is provided with a lock shell cavity for pulling up and containing the rotary pull arm, the first end of the rotary pull arm is rotatably connected with a rotating shaft, the rotating shaft is used for connecting a lock bolt, the lock cylinder is arranged at the second end of the rotary pull arm, the motor assembly is arranged inside the lock shell, the motor assembly comprises a driving motor and a locking block which is driven by the driving motor and moves, the lock cylinder comprises a lock tongue, and the lock tongue is used for locking or unlocking matching with the locking block.

Preferably, the lock cylinder includes a key shaft for insertion of the key and rotation therewith, the key shaft being rotatably connected to the lock tongue.

Preferably, the lock tongue includes an engaging portion for engaging the lock block, and a lifting portion for lifting up the lock block and disengaging the lock block from engagement with the engaging portion.

Preferably, the engaging portion is provided at an inner end of the ejecting portion, the engaging portion is shaped like a circular truncated cone having a surface for engaging the locking block, and the ejecting portion is shaped like a tooth.

Preferably, the locking block comprises a clamping plate for clamping with the clamping part, and the clamping plate is provided with an arc-shaped edge for rotatably jacking the jacking part.

Preferably, the height of the edge of the arc-shaped edge is gradually reduced along the positive rotation direction of the jack-up portion.

Preferably, the lock further comprises a motor mounting shell, the motor mounting shell is arranged inside the lock shell, and a sliding groove for the locking block to move in the motor mounting shell, a lock cylinder cavity for accommodating the lock cylinder and a pull arm groove for accommodating the rotary pull arm are formed in the motor mounting shell.

Preferably, the lock shell is provided with a cover plate for covering the lock shell cavity, and the motor installation shell is provided with a magnet for attracting the cover plate.

Preferably, the inner surface of the arm-pulling groove is provided with an arm-pulling spring for ejecting the rotating arm-pulling.

Preferably, the second end of the rotary pull arm extends out of a handle which is convenient for a human hand to hold.

The invention has the beneficial effects that: the invention discloses a cabinet lock, which comprises a lock shell, a rotary pull arm, a lock cylinder and a motor assembly, wherein the lock shell is provided with a lock shell cavity for pulling up and containing the rotary pull arm, the first end of the rotary pull arm is rotatably connected with a rotating shaft, the rotating shaft is used for connecting a lock bolt, the lock cylinder is arranged at the second end of the rotary pull arm, the motor assembly is arranged in the lock shell, the motor assembly comprises a driving motor and a locking block which is driven by the driving motor and moves, the lock cylinder comprises a lock tongue, and the lock tongue is used for locking or unlocking with the locking block. This cabinet lock can realize that key machinery unblanks and motor is long-range unblanks, still has small simultaneously, and structural integration degree is high, and the space occupies less advantage.

Drawings

FIG. 1 is a schematic view of an embodiment of a cabinet lock of the present invention;

FIG. 2 is a schematic diagram illustrating an opened state of the cover plate and the rotating arm in the embodiment of FIG. 1;

FIG. 3 is a schematic view of another embodiment of a cabinet lock according to the present invention in an exploded state;

FIG. 4 is a schematic view of the connection relationship between the motor assembly and the lock cylinder in another embodiment of the cabinet lock of the invention;

fig. 5 is a schematic view of the embodiment of fig. 4 showing the latch bolt in a rotated state;

FIG. 6 is a schematic view of the lock block and the latch of another embodiment of the cabinet lock of the present invention;

FIG. 7 is a vertical cross-sectional view of the motor assembly and lock cylinder of another embodiment of the cabinet lock of the present invention;

fig. 8 is a schematic view of the connection relationship between the motor mounting housing and the motor assembly in another embodiment of the cabinet lock of the present invention.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In the drawings of the specification, an arrow X indicates an inside-outside direction, i.e., a front-back direction, and a direction pointed by the arrow X is an outside direction (i.e., a front direction), an arrow Y indicates a lateral direction, and an arrow Z indicates a vertical direction.

Combine figure 1, figure 2 and figure 3, this cabinet lock is including lock shell 1, rotate the single arm-drag 2, lock core 3, motor element 4, lock shell 1 is provided with and supplies to rotate the single arm-drag 2 and pull up and accomodate the lock shell chamber wherein, the first end of rotating single arm-drag 2 is rotated and is connected with pivot 5, pivot 5 is used for connecting the set bar, lock core 3 sets up the second end at rotating single arm-drag 2, motor element 4 sets up the inside at lock shell 1, motor element 4 includes driving motor 41 and carries out the locking piece 42 that removes by the driving motor 41 drive, lock core 3 includes spring bolt 31, spring bolt 31 is used for locking or unblock cooperation with locking piece 42. The key is inserted and the lock cylinder 3 is rotated to drive the lock tongue 31 to rotate, so that the lock tongue 31 and the locking block 42 are locked or unlocked mutually, the purpose of mechanically unlocking and locking the key is achieved, meanwhile, due to the arrangement of the driving motor 41, the driving motor 41 drives the locking block 42 to move, the locking block 42 and the lock tongue 31 are clamped or unlocked mutually, and the purpose of unlocking and locking the motor is achieved.

Preferably, as shown in fig. 3, the lock cylinder 3 includes a key shaft 32 for inserting a key and rotating with the key, the key shaft 32 is rotatably connected to the lock tongue 31, the key shaft 32 is detachably connected to the lock tongue 31, the lock tongue 31 and the key shaft 32 are detachable, and after the lock tongue 31 is used for a long time, the lock tongue 31 can be directly replaced due to abrasion or damage, thereby saving cost.

Preferably, combine fig. 3, fig. 4 and fig. 5, spring bolt 31 is including the block portion 311 that is used for block locking piece 42, and be used for jack-up locking piece 42 and make locking piece 42 break away from the jack-up portion 312 with block portion 311 block, this kind of spring bolt 31 structure has realized block 311 locking piece 42 and jack-up locking piece 42 and then unblank fast, make same spring bolt 31 structure have two kinds of different functions, let the function pluralism of single structure, make a plurality of structures integrate together, the integration degree of spring bolt structure has been improved, realize the multi-purpose function of a thing, save the material, the occupied space volume of structure has also been reduced simultaneously, realize the structure miniaturization.

Preferably, with reference to fig. 3, 4 and 5, the engaging portion 311 is disposed at the inner end of the jacking portion 312, the engaging portion 311 is in the shape of a truncated cone, specifically, the engaging portion 311 may not be the entire truncated cone, but may be a truncated partial truncated cone, the truncated cone has a table 3111 for engaging the locking block 42, and the jacking portion 312 is in the shape of a tooth, which includes the shape of a tooth of a human body, an elliptical protruding structure, a protruding frustum, and the like.

Preferably, the raised portion tapers upwardly for material savings and for structural adaptation to the lower bottom surface of the locking block.

It is further preferable that the edge of the engaging portion 311 of the lifting portion 312 extends out, that is, the tooth-shaped lifting portion 312 extends out from the edge of the truncated cone-shaped engaging portion 311, in order to ensure that the lifting portion 312 can completely disengage the lock block 42 from the edge of the engaging portion 311 when lifting up the lock block 42, that is, ensure that the lock block 42 is completely lifted up, and avoid that the lifting portion 312 does not lift the lock block 42 away from the engaging portion 311 when rotating to the highest position to lift up the lock block.

Preferably, with reference to fig. 3, 4 and 5, the locking block 42 includes a clamping plate 421 for engaging with the engaging portion 311, the clamping plate 421 has an arc edge 4211 for the jacking portion 312 to jack up in a rotating manner, the arc edge 4211 is arranged to avoid the direct collision between the jacking portion 312 and the edge of the clamping plate 421, so as to reduce friction, reduce wear degree, and prolong the service life of the locking tongue 31 and the locking block 42.

Preferably, with reference to fig. 3, 4 and 5, the height of the edge of the arc edge 4211 is gradually reduced along the forward rotation direction of the jacking portion 312, such a configuration causes the jacking portion 312 to rotate in the forward direction (to jack up the card board 421) and to increase the contact area with the arc edge 4211 when just contacting the arc edge 4211, that is, the contact area between the jacking portion 312 and the arc edge 4211 is higher at this time, on one hand, sharp collision between the jacking portion 312 and the arc edge 4211 is avoided, on the other hand, the jacking portion 312 is more stable and smooth when jacking the card board 421, the process of jacking the card board 421 is kept at a constant speed as much as possible, that is, the jacking process becomes more uniform, the occurrence of the jacking process is avoided, and the linkage between the lock tongue 31 and the lock block 42 becomes gentle.

Preferably, with reference to fig. 4, 5, 6 and 7, the thickness of arcuate rim 4211 is less than the thickness of lifters 312 in the inboard and outboard directions, and this arrangement is provided to ensure that lifters 312 have sufficient contact area with arcuate rim 4211, and also to ensure that lifters 312 have sufficient structural strength to lift arcuate rim 4211 (or the entire lock block 42).

Preferably, as shown in fig. 6, the arc arrow in fig. 6 represents the forward rotation direction of the latch tongue 31 (i.e. the rotation direction of the jacking portion 312 about to rotate to jack up the card 421), the straight arrow in fig. 6 represents the transition of the latch tongue 31 from the initial state a to the extreme state B of rotating to jack up the card 421, specifically, the rotation angle of the jacking portion 312 between the initial state a and the extreme state B of rotating to jack up the card 421 is 0 ° to 120 °, wherein 120 ° is the rotation limit angle beyond which the lock block 42 (i.e. the card 421) falls back and the card 421 is engaged with the engaging portion 311 again, so that the rotation of the latch tongue 31 is limited by the angular range, more specifically, when the rotation range of the jacking portion 312 (i.e. the rotation range of the latch tongue 31) is 0 to 90 °, the card 421 is not disengaged from the engaging portion 311, and when the rotation range of the jacking portion 312 is 90 ° -120 °, when the card 421 is disengaged from the engaging portion 311 and the rotation range of the jack portion 312 exceeds 120 °, the card 421 is engaged with the engaging portion 311 again.

Preferably, with reference to fig. 6 and 7, in the inside-outside direction, the height of the arc edge 4211 gradually increases from inside to outside, that is, the outside height of the arc edge 4211 is higher than the inside height of the arc edge 4211, that is, the outside edge of the arc edge 4211 extends to the inside edge of the arc edge 4211 to form an arc surface 42111, so that when the locking mechanism is locked, the edge of the engaging portion 311 can conveniently reach the inside surface of the card 421 from the outside surface of the card 421 along the arc surface 42111, thereby completing the engagement between the engaging portion 311 and the card 421, completing the locking operation, and this process can effectively reduce the friction loss between the edge of the engaging portion 311 and the arc edge 4211, and prolong the service lives of the two.

Further preferably, in combination with fig. 6 and 7, the arc-shaped surface 42111 has an arc-shaped convex surface 421111 and an arc-shaped concave surface 421112, and along the positive rotation direction of the lock tongue 31, the arc-shaped convex surface 421111 and the arc-shaped concave surface 421112 are sequentially arranged, the arrangement is such that the jacking portion 312 keeps the upward moving speed of the card board 421 in the two states gentle and even when contacting and jacking against the arc-shaped convex surface 421111 and the arc-shaped concave surface 421112, because the initial upward moving speed of the card board 421 is given when the jacking portion 312 initially jacks against the arc-shaped convex surface 421111, which is equivalent to a sudden acceleration and speed given to the card board 421, and in order to make the next card board 421 move more gently and reduce the excessive upward moving tendency of the card board 421, the arc-shaped concave surface 421112 is arranged to reduce the jacking tendency of the jacking portion 312 to jack up the card board 421 (because the arc-shaped concave surface 421112 is inwards concave, the contact time of the jacking portion 312 with the arc-shaped concave surface 421112 is delayed), the upward moving speed of the knock-up portion 312 at the time of contacting the knock-up arcuate convex 421111 and the arcuate concave 421112 is kept as uniform as possible.

Further preferably, as shown in fig. 7, the engagement portion 311 in the shape of a circular truncated cone whose generatrix X1 gradually rises from the inside to the outside is provided so that the engagement portion 311 gradually pushes up the card plate 421 when the card plate 421 is pressed by the engagement portion 311 in the process of engaging the lock tongue 31 with the lock block 42, and the card plate 421 abuts against the land 3111 of the engagement portion 311, that is, the engagement between the engagement portion 311 and the card plate 421 is made smoother.

Preferably, combine fig. 3, fig. 4 and fig. 5, motor element 4 is vertical to be set up, driving motor 41 rotates and is connected with major axis 43, major axis 43 passes locking block 42, locking block 42 has seted up the chamber 422 that holds of some major axes, be provided with the telescopic spring 44 of cover setting and block major axis 43 in holding the chamber 422, the both ends of telescopic spring 44 support respectively and hold the inside upper wall and the lower wall of chamber 422, when driving motor 41 corotation or reversal, telescopic spring 44 is corresponding to compression or tensile, with this drive locking block 42 reciprocate, and through the rotational speed of control driving motor 41, the speed that adjustable locking block 42 reciprocated.

With reference to fig. 3-7, the following is a practical application of the cabinet lock:

mechanical unlocking and locking process: firstly, inserting a key into the lock cylinder 3 and rotating, positively rotating the jacking part 312 of the lock tongue 31 to jack the clamping plate 421, so that the clamping plate 421 rises to be disengaged from the engaging part 311, then disengaging the lock tongue 31 from the locking block 42, pulling the rotary pull arm 2 connected with the lock tongue 31 (or the lock cylinder 3) away from the lock case cavity (or the pull arm groove 63), then returning the clamping plate 421 to the original position to facilitate subsequent locking, then rotating the rotary pull arm 2, driving the lock plunger (or the heaven and earth rod connected with the rotating shaft 5) to rotate through the rotating shaft 5 to complete unlocking, and if locking is required, rotating and pressing the rotary pull arm 2 to return to the lock case cavity (or the pull arm groove 63), rotating the key to enable the engaging part 311 to re-engage the clamping plate 421, and pulling out the key to complete locking; or the rotating pull arm 2 is directly rotated and pressed to make the engaging portion 311 press the card board 421, and the table 3111 of the engaging portion 311 engages with the card board 421 to complete the locking, which is accompanied with the process that the engaging portion 311 lifts up the card board 421.

Unlocking and locking a motor: the driving motor 41 is controlled to rotate, so that the locking block 42 moves up integrally, that is, the locking plate 421 is driven to move up, the locking plate 421 is disengaged from the clamping with the clamping portion 311, the rotating draw arm is pulled up and rotates, the rotating shaft 5 rotates, and then the lock bolt (or the top and bottom rod) is driven to rotate to complete unlocking, if locking is required, the driving motor 41 is controlled to rotate, so that the locking block 42 moves down integrally, that is, the locking plate 421 moves down, so that the locking plate 421 is clamped with the clamping portion 311 again, and locking is completed.

Preferably, with reference to fig. 3 and 8, the lock further includes a motor mounting shell 6, the motor mounting shell 6 is disposed inside the lock shell 1, a sliding slot 61 for the locking block 42 to move therein, a lock cylinder cavity 62 for accommodating the lock cylinder 3, and a pull arm slot 63 for accommodating the rotating pull arm 2 are disposed on the motor mounting shell 6, specifically, the sliding slot 61 is disposed on the inner side (i.e., rear) of the motor mounting shell 6, the lock cylinder cavity 62 is disposed on the lower portion of the motor mounting shell 6, the pull arm slot 63 is disposed on the outer side (i.e., front) of the motor mounting shell 6, and the motor mounting shell 6 is configured to fix the motor assembly 4, accommodate the rotating pull arm 2 and the lock cylinder 3, on the one hand, and also to enhance the overall structural strength of the lock shell 1.

Further preferably, as shown in fig. 3, the upper portion of the motor mounting housing 6 is provided with a rotating shaft accommodating cavity 64 for accommodating the rotating shaft 5, which can limit the rotating axis of the rotating shaft 5 to allow the rotating shaft 5 to rotate in a fixed axis manner.

Further preferably, with reference to fig. 3 and 8, two vertical columns 65 that are parallel to each other and horizontally disposed are disposed on the inner side (i.e., the rear side) of the motor mounting housing 6, and a distance between the two vertical columns 65 is adapted to the width of the motor assembly 4, so as to limit the transverse direction of the motor assembly 4 and prevent the motor assembly 4 from shaking.

Further preferably, with reference to fig. 3 and 8, the ends of the two upright posts 65 are provided with motor fixing plates 66 through screws, and the motor fixing plates 66 are attached to and press the motor assembly 4, so as to limit the inside and outside directions (i.e., the front and back directions) of the motor assembly 4 and avoid the shaking of the motor assembly 4.

Preferably, referring to fig. 1, 2 and 3, the lock case 1 is provided with a cover plate 7 for covering the lock case cavity, and the motor mounting case 6 is provided with a magnet 68 for attracting the cover plate 7.

Further preferably, with reference to fig. 3 and 8, the upper portion of the motor mounting housing 6 is provided with two fixing posts 67 which are parallel and horizontally arranged, the fixing posts 67 extend into the lock housing 1 and are fixedly connected with the lock housing 1 through screws, and a magnet 68 for attracting the cover plate 7 is arranged at an outer (i.e. front) end of the fixing posts 67.

Further preferably, in combination with fig. 3 and 8, the outer end of the fixing pillar 67 is provided with a pillar groove 671, and the magnet 68 is disposed in the pillar groove 671, so as to effectively protect the magnet 68.

Preferably, with reference to fig. 2 and 3, a pull arm spring 631 for bouncing the rotating pull arm 2 is disposed on an inner surface of the pull arm groove 63, and the pull arm spring 631 is disposed to conveniently bounce the rotating pull arm 2 during unlocking, so that the rotating pull arm 2 is more conveniently pulled out of the pull arm groove 63.

Further preferably, a horizontal spring post 632 is disposed on the inner surface of the pull arm groove 63, and the pull arm spring 631 is sleeved on the spring post 632 to better fix the pull arm spring 631 in the transverse direction and the vertical direction.

Preferably, in combination with fig. 2 and 3, the second end of the rotation arm 2 extends out of the handle 21 for being held by a human hand, and the extending direction is a transverse straight line.

Preferably, as shown in fig. 2, the inside of the handle 21 of the swing arm 2 is provided with a magnet 23 for facilitating the attraction of the swing arm 2 into the arm slot 63.

Preferably, as shown in fig. 3, the second end of the rotating arm 2 is provided with a key shaft hole 22 for receiving the key shaft 32.

Preferably, in combination with fig. 1, 2 and 3, the upper part of the lock case 1 is provided with a groove 11 for facilitating the finger of a human body to insert and lift the cover plate 7.

Preferably, the lower end of the cover plate 7 is hinged with the lock case 1, so that the cover plate 7 can be conveniently lifted from top to bottom from the upper end of the cover plate 7, and the cover plate 7 can be conveniently lifted by utilizing the self weight and gravity of the cover plate 7.

Based on the embodiment, the invention discloses a cabinet lock which comprises a lock shell, a rotary pull arm, a lock cylinder and a motor assembly, wherein the lock shell is provided with a lock shell cavity for the rotary pull arm to be pulled up and stored in, the first end of the rotary pull arm is rotatably connected with a rotating shaft, the rotating shaft is used for being connected with a lock bolt, the lock cylinder is arranged at the second end of the rotary pull arm, the motor assembly is arranged inside the lock shell, the motor assembly comprises a driving motor and a locking block which is driven by the driving motor to move, the lock cylinder comprises a lock bolt, and the lock bolt is used for being locked or unlocked with the locking block. This cabinet lock can realize that key machinery unblanks and motor is long-range unblanks, still has small simultaneously, and structural integration degree is high, and the space occupies less advantage.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.

Claims

1. A cabinet lock is characterized by comprising a lock shell, a rotary pull arm, a lock cylinder and a motor assembly, wherein the lock shell is provided with a lock shell cavity for the rotary pull arm to be pulled up and stored in, a first end of the rotary pull arm is rotatably connected with a rotating shaft, the rotating shaft is used for connecting a lock bolt, the lock cylinder is arranged at the second end of the rotary pull arm, the motor assembly is arranged in the lock shell, the motor assembly comprises a driving motor and a locking block which is driven by the driving motor to move, the lock cylinder comprises a lock tongue, and the lock tongue is used for being locked or unlocked with the locking block;

the lock tongue comprises a clamping part for clamping the locking block and a jacking part for jacking the locking block and enabling the locking block to be disengaged from the clamping part;

the locking block comprises a clamping plate which is used for clamping with the clamping part, and the clamping plate is provided with an arc-shaped edge for the jacking part to rotate and jack up;

the height of the edge of the arc-shaped edge is gradually reduced along the positive rotation direction of the jacking part.

2. The cabinet lock of claim 1, wherein the lock cylinder includes a key shaft for insertion of a key and rotation therewith, the key shaft being rotatably coupled to the locking bolt.

3. The cabinet lock of claim 2, wherein the engaging portion is disposed at an inner end of the jacking portion, the engaging portion is shaped as a truncated cone having a mesa for engaging the locking block, and the jacking portion is shaped as a tooth.

4. The cabinet lock of claim 1, further comprising a motor mounting housing disposed within the lock housing, the motor mounting housing having a sliding slot for movement of the locking block therein, a cylinder cavity for receiving the cylinder, and a draw arm slot for receiving the rotary draw arm.

5. A cabinet lock as defined in claim 4, wherein the lock housing is provided with a cover plate for covering the cavity of the lock housing, and the motor mounting housing is provided with a magnet for attracting the cover plate.

6. The cabinet lock of claim 5, wherein the inner surface of the pull arm groove is provided with a pull arm spring for springing up the rotating pull arm.

7. The cabinet lock of claim 1, wherein the second end of the swivel pull arm extends out of a handle for gripping by a human hand.