TWI774579B - Palm wrench structure - Google Patents

Abstract

The invention relates to a palm-type wrench structure, which comprises: a system is provided with two sets of setting parts, and each set of setting parts is provided with two first pivot parts, a first peripheral surface, a notch and two first end face; two drive head assemblies are pivoted with the assembly portion, the drive head assembly rotates in the first peripheral surface with the two first pivot portions as the axes, and the drive head assembly is provided with two second The pivot part, a first joint part, and a first action end, the first action end is in the shape of a protruding quadrangular head, and the other driving head set is provided with a second action end, and the second action end is in the shape of a quadrangular groove The specification of the second action end is the same as the specification of the first action end, one of which is a male specification and the other is a female specification. The drive head set is provided with a second end face; It is pivoted with the two driving head groups.

Description

Palm wrench structure

The invention relates to a palm-type wrench structure, especially a palm-type wrench structure is provided with the two driving head groups, and both ends of the palm-type wrench structure can be respectively sleeved with hand tools of corresponding specifications. More expandability in operation and rotation. The first acting end and the second acting end are provided, and the first acting end and the second acting end can be set to different states according to requirements and have expandability.

According to our previous knowledge, the conventional palm-type wrench structure is also a patent case applied for by the applicant, Taiwan patent application number: 104127798, certificate number: I535538, patent name: palm-type wrench structure, the patent case structure is In: a palm wrench structure, which comprises:

A main body 10, the main body 10 is a palm-shaped tool for the hand to hold and rotate, the main body 10 is in the shape of a ring body C-shaped, the main body 10 is provided with a first pivot portion 11, the first pivot The portion 11 is in the shape of a penetrating circular hole. The outer side of the first pivot portion 11 is respectively provided with a first accommodating slot 12. The first pivot portion 11 and the first accommodating slot 12 are both in the shape of a circular hole. The diameter of the accommodating groove 12 is slightly larger than the diameter of the first pivot portion 11 , the main body 10 is provided with an inner peripheral surface 13 and a first outer peripheral surface 14 , the main body 10 is provided with a gap 15 , and the gap 15 is connected to the first pivot surface. The distance between the parts 11 is ninety degrees, the distance between the two ends of the first pivot part 11 is the first length 21, the diameter of the inner peripheral surface 13 is the first diameter 22, and the diameter of the first outer peripheral surface 14 is The second diameter 23, the second diameter 23 is not greater than seventy-five mm, the first length 21 is larger than the first diameter 22 , the first length 21 is smaller than the second diameter 23 , the width of the notch 15 is the first distance 24 , and the first outer peripheral surface 14 of the main body 10 is provided with a plurality of first recesses grooves 16, the first grooves 16 are arc-shaped for accommodating fingers, and the plurality of first grooves 16 are annularly arranged;

A driving head group 30, the driving head group 30 can be accommodated at the inner peripheral surface 13 of the main body 10, the outer diameter of the driving head group 30 is slightly smaller than the first diameter 23 of the main body 10, the driving head group 30 is A second pivot portion 31 is provided, and the second pivot portion 31 and the first pivot portion 11 are pivotally arranged, so that the driving head group 30 can pass through the inner peripheral surface 13 of the main body 10 to adjust the angle relative to the main body 10 arbitrarily, The second pivot portion 31 and the first pivot portion 11 have the same diameter, and a third pivot portion 32 is provided in the second pivot portion 31 , and the diameter of the third pivot portion 32 is smaller than the diameter of the second pivot portion 31 , the third pivot part 32 is provided with a first joint part 33, the first joint part 33 and the third pivot part 32 have the same diameter, the first joint part 33 is in the shape of an internal thread, the second joint part 33 The pivot portion 31 , the third pivot portion 32 and the first joint portion 33 are connected in sequence, and both ends of the driving head group 30 are respectively provided with a first action end 34 and a second action end 341 ;

Two connecting pieces 40 , the connecting piece 40 is provided with a fourth pivot portion 41 , the fourth pivot portion 41 is pivoted with the first pivot portion 11 of the main body 10 , and the fourth pivot portion 41 is connected to the first pivot portion 41 . 11 is in a loose fit state, a rod body 42 is arranged on the coupling member 40, the rod body 42 is in the shape of a cylinder, and the rod body 42 is passed through the first pivot portion 11 of the main body 10 and the drive head group. In the second pivot portion 64 and the third pivot portion 32 of 30, the rod body 42 is pivoted with the third pivot portion 32, and the end of the rod body 42 is provided with a second joint portion 43, the second joint portion 43 is in the shape of an external thread, and the second joint portion 43 is screwed with the first joint portion 33 , so that the driving head set 30 is pivoted to the first pivot 11 of the main body 10 through the two joint members 40 . Above, the driving head set 30 is relative to the main body 10 with the two first pivots 11 and the two joints 40 as the axes. Free rotation angle, the other end of the coupling member 40 is provided with a first head 44, the first head 44 is accommodated in the first accommodating groove 12 of the main body 10, and the first head 44 is a circular body shape;

Two first elastic elements 50, the first elastic element 50 is accommodated in the first pivot portion 11 and the second pivot portion 31, the first elastic element 50 is sleeved on the rod body 42, the first elastic element The 50 series elastic force pushes against the second pivot portion 31 and the fourth pivot portion 41;

The two coupling members 40 and the first elastic element 50 are symmetrical with respect to the driving head set 30 .

But the lack of this conventional palm wrench structure is:

1. The main body 10 is pivotally provided with only one driving head group 30, and the rotation is only as shown in the first main figure and the ninth figure. The practicability of the conventional palm wrench structure in use is rather insufficient.

2. When rotating, use your finger against the first groove 16 to rotate the main body 10 to drive the driving head group 30 to rotate, but it is difficult to apply force only when the finger is against the first groove 16 In the main body 10 , the finger may slip out of the first groove 16 due to factors such as insufficient grip strength or slippery of the finger during operation.

In view of the above-mentioned deficiency of the conventional structure, the inventor of the present invention has finally developed a product with a palm-type wrench structure that can solve the drawbacks of the conventional structure with years of experience in manufacturing, production and design in related industries.

The problem to be solved by the invention: in the conventional palm-type wrench structure, the system only pivots with one driving head group, and there are only two rotation modes when rotating. The practicability of the structure is relatively insufficient in use. The palm-type wrench structure of the present invention is provided with the two driving head groups, and both ends of the palm-type wrench structure can be respectively fitted with hand tools of corresponding specifications, which has more expandability in operation and rotation. The first acting end and the second acting end are provided, and the first acting end and the second acting end can be set to different states according to requirements and have variability and expandability.

Technical means for solving the problem: a palm-type wrench structure, which includes: a system is provided with two sets of setting parts, each set of setting parts is provided with two first pivot parts, a first peripheral surface, a gap and two sets of parts; a first end face; two drive head assemblies are pivoted with the assembly portion, the drive head assembly rotates in the first peripheral surface with the two first pivot portions as the axes, and the drive head assembly is provided with two A second pivot portion, a first joint portion, and a first action end, the first action end is in the shape of a protruding quadrangular head, and the other drive head set is provided with a second action end, and the second action end is in the shape of a protruding square head. Four-cornered groove shape, the specification of the second acting end is the same as that of the first acting end, one of which is male and the other is female. The drive head set is provided with a second end face; The body is pivoted with the two driving head sets.

Compared with the effect of the prior art: with the two driving head groups, both ends of the palm-type wrench structure can be respectively set with tools such as sockets, connecting rods, and adapters of corresponding specifications, which is more convenient to operate. Expansion on Rotation. The first acting end and the second acting end are provided, and the first acting end and the second acting end can be set to different specifications according to requirements, so that the present invention has variability and expandability.

In order to make the committee members and those skilled in the art fully understand the effect of the present invention, the structure and composition of the present invention are explained in the following in conjunction with the drawings and drawing numbers, but the following descriptions are only used to explain the implementation of the present invention example, it is not intended to limit the present invention in any form. Therefore, any modification made under the spirit of the present invention should still belong to the protection scope of the present invention.

10: Ontology

11: Organization Department

12: The first pivot

13: The first container

14: First week face

15: Notch

16: The first end face

17: First distance

18: The third acting end

30: Drive head group

31: Second pivot

32: The first joint

34: The first acting end

35: The second acting end

36: Second end face

40: Bonding pieces

41: The second joint

50: elastic element

Fig. 1 is an exploded perspective view of the structure of the palm wrench of the present invention.

Fig. 2 is a top view of the structure body group of the palm wrench according to the present invention.

Fig. 3 is a three-dimensional combined view of the structure of the palm wrench of the present invention.

Fig. 4 is a top view of the palm wrench structure of the present invention.

FIG. 5 is a cross-sectional view of the present invention at A-A of FIG. 4 .

Fig. 6 is an enlarged view of the position B of Fig. 5 of the present invention.

FIG. 7 is a perspective view of the second embodiment of the present invention.

FIG. 8 is a perspective view of the third embodiment of the present invention.

FIG. 9 is a perspective view of a fourth embodiment of the present invention.

FIG. 10 is a perspective view of a fifth embodiment of the present invention.

First, please refer to FIGS. 1 to 2. FIG. 1 is an exploded perspective view of the structure of a palm wrench according to the present invention, and FIG. 2 is a top view of the structure body 10 of the palm wrench according to the present invention. The present invention relates to a structure of a palm wrench, which The system includes: a main body 10 , the main body 10 is a palm-sized tool for holding and rotating by hand, the main body 10 is provided with two sets of parts 11 , and the two sets of parts 11 are set on two parts of the main body 10 end, the two groups The setting portion 11 is relatively symmetrical with respect to the main body 10 , the set portion 11 is slightly C-shaped, and each set portion 11 is provided with two first pivot portions 12 , and the first pivot portions 12 pass through the In the assembly portion 11 , the first pivot portion 12 is in the shape of a circular hole, and the outer side of the first pivot portion 12 is provided with a first accommodating groove 13 , and the first accommodating groove 13 communicates with the first pivot portion 12 . , the first accommodating groove 13 is in the shape of a circular groove, the diameter of the first accommodating groove 13 is slightly larger than the diameter of the first pivot portion 12 , the assembly portion 11 is provided with a first peripheral surface 14 , the first The peripheral surface 14 is disposed on the inner peripheral surface of the assembly portion 11 , and a gap 15 is formed at the opening of the assembly portion 11 . The two ends of the notch 15 are provided with two first end faces 16 , the two first end faces 16 are in the shape of overlapping surfaces, and the first end faces 16 are in the shape of a plane; There is a first distance 17 between the first pivot portion 12 of the setting portion 11 and the axes of the two first pivot portions 12 of the other set portion 11 , and the length of the first distance 17 is smaller than that of the main body The length of 10, the first distance 17 is also the distance between the two axes of the two first peripheral surfaces 14; , the driving head group 30 rotates in the first peripheral surface 14 with the two first pivots 12 as the axes, the outer diameter of the driving head group 30 is slightly smaller than the diameter of the first peripheral surface 14, the driving The head set 30 is provided with two second pivot portions 31 , each second pivot portion 31 is in a relatively positive shape with each first pivot portion 12 , and a first joint portion 32 is arranged in the second pivot portion 31 . The first joint portion 32 is in the shape of an internal thread, one of the driving head groups 30 is provided with a first action end 34, the first action end 34 is in the shape of a protruding quadrangular head, and the other driving head group 30 is provided with a first action end 34. The second acting end 35 is in the shape of a quadrangular groove. The specification of the second acting end 35 is the same as that of the first acting end 34, except that one is male and the other is female. Specifications, the second action end 35 is through the groove or not through the drive head set 30, the first action end 34 and the second action end 35 are compatible with the corresponding specifications of the sleeve, post, adapter Hand tools such as parts are nested with each other, the driving head group 30 is provided with a second end surface 36, and the second end surface 36 is flat;

The inner system of the driving head group 30 provided with the first acting end 34 can have the function of a ratchet structure;

The driving head set 30 provided with the second acting end 35 is adjusted upwardly at a ninety-degree angle with the two first pivots 12 as the axes, that is, the driving head set 30 provided with the second acting end 35 When the axis of the drive head assembly 30 is perpendicular to the axis of the assembly portion 11 , the second end surface 36 of the driving head group 30 is opposite to the notch 15 , and the second end surface 36 and the first end surface 16 flush or slightly flush;

A plurality of coupling parts 40 are used for pivoting the main body 10 and the two driving head sets 30 , the two coupling parts 40 are pivoted with the assembly part 11 , and one end of the coupling parts 40 is passed through In the first pivot portion 12 and the second pivot portion 31 , the coupling member 40 and the first pivot portion 12 are in a loose fit state, and the coupling member 40 is provided with a second coupling portion 41 . The two joint parts 41 are screwed together with the first joint part 32 , so that the driving head group 30 is pivoted at the first pivot 12 by the two joint parts 40 , and the second joint part 41 is in the shape of In the shape of an external thread, the head of the coupling piece 40 is accommodated in the first accommodating groove 13, the coupling piece 40 is a screw coupling structure, and the number of the coupling piece 40 is four;

The driving head group 30 is rotated around the two first pivot portions 12 as the axis, and the driving head group 30 is arbitrarily adjusted relative to the grouping portion 11 . Rotating the main body 10 rotates the driving head group 30 ;

A plurality of elastic elements 50, the elastic elements 50 are accommodated in the first pivot portion 12, The elastic element 50 is sleeved on the coupling element 40 , the elastic element 50 is elastically pressed between the driving head set 30 and the coupling element 40 , the elastic element 50 is a spring structure, the number of the elastic element 50 is is four;

The two coupling elements 40 and the two elastic elements 50 are symmetrical relative to the driving head set 30 .

Please refer to FIG. 3 to FIG. 6. FIG. 3 is a three-dimensional combined view of the structure of the palm wrench according to the present invention, FIG. 4 is a top view of the structure of the palm wrench according to the present invention, and FIG. 5 is a cross-sectional view at A-A of FIG. FIG. 6 is an enlarged view of the position B of FIG. 5 according to the present invention, the two sets of parts 11 are set at both ends of the main body 10 , each of the drive head sets 30 is set at each set of parts 11 , the first An acting end 34 is provided on one of the driving head sets 30 , the second acting end 35 is provided on the other driving head set 30 , and the coupling element 40 is passed through the first pivot portion 12 and the second pivot portion 31 , the elastic element 50 is accommodated in the first pivot portion 12 .

Please refer to FIG. 7 . FIG. 7 is a perspective view of the second embodiment of the present invention. The states of the first acting end 34 and the second acting end 35 can be changed according to requirements, such as the first acting end 34 and the second acting end 35 . Both the second acting ends 35 are in the shape of a quadrangular groove, or both the first acting end 34 and the second acting end 35 are in the shape of a quadrangular head, or one is in the shape of a quadrangular head and the other is in the shape of a quadrangular groove. 11 with the same first peripheral surface 14, the drive head group 30 with the same outer diameter can be assembled, and there are three variations.

Please refer to FIG. 8 . FIG. 8 is a perspective view of a third embodiment of the present invention. It can be clearly seen from the figure that the number of the palm wrench structure is two or more. The driving head set 30 and the set of The parts 11 are concentric. The first working end 34 of the palm wrench structure is fitted with the second working end 35 of the other palm wrench structure, so that the two palm wrench structures are connected. The structures are not separated from each other, and the plurality of palm-type wrench structures are sequentially assembled into a longer ratchet-type wrench structure.

Please refer to FIG. 9. FIG. 9 is a perspective view of a fourth embodiment of the present invention. In this embodiment, the number of the palm wrench structures is two or more. A pivot portion 12 and the two joint members 40 are adjusted for the angle of the axis, so that the axis of the driving head assembly 30 and the axis of the assembly portion 11 are in a 90-degree shape, so that the second end surface 36 is aligned with the gap 15. The second end face 36 is tangent to the first end face 16, and the first action end 34 of the palm wrench structure is fitted with the second action end 35 of another palm spanner structure, so that the The two palm-type wrench structures are assembled together and cannot be separated from each other, and the plurality of palm-type wrench structures are sequentially assembled into a longer ratchet-type wrench structure.

Please refer to FIG. 10 . FIG. 10 is a perspective view of a fifth embodiment of the present invention. A set portion 11 and a drive head set 30 are integrally formed. The handle portion of the main body 10 has a third action end 18 in it. , one end of the third action end 18 is open, the specification of the third action end 18 is smaller than the second action end 35, the third action end 18 is in the shape of a quadrangular groove, and the second action end 35 is Three-point size, the third piece of the action end 18 is a two-point size, or the second action end 35 is a quarter size, the third piece of the action end 18 is a three-point size.

In another embodiment of the present invention, the first acting end 34 and the second acting end 35 are respectively in the shape of a hexagonal head, a hexagonal groove, various groove shapes, or various head shapes, etc., so as to conform to the specifications of various tools. required.

The advantages of the palm wrench structure of the present invention are:

1. With the two driving head groups 30, the two ends of the palm wrench structure of the present invention can be set up with tools such as sockets, connecting rods, and adapters of corresponding specifications, so as to facilitate operation and rotation. above Extensibility.

2. The first action end 34 and the second action end 35 are provided. The first action end 34 and the second action end 35 can be set to different states according to the needs of the user, so that the present invention has variability and expandability.

3. The first distance 17 is provided. The first distance 17 enables a larger contact area between the fingers and the palm and the main body 10, so that the present invention has an easier to apply force and a better holding structure during operation. effect.

4. The driving head group 30 can be rotated at any angle with the two first pivots 12 and the two coupling parts 40 as the axes, and the driving head group 30 can be operated in the same axis with respect to the group setting part 11, Either the driving head group 30 is an operation method in which the angle of the driving head group 30 is adjusted arbitrarily relative to the assembly portion 11, or the axis of the driving head group 30 is an operation method in which the axis of the driving head group 30 and the axis of the assembly portion 11 form a ninety-degree shape, the present invention It has the function of multi-directional operation, which is convenient for users to change the direction of rotation and the angle of operation when working in a narrow space.

5. When the drive head assembly 30 and the axis of the assembly portion 11 are operated at ninety degrees, the second end face 36 is aligned with the notch 15, and the second end face 36 is tangent to the first end face 16. , Rotating the main body 10 drives the driving head group 30 to rotate, and the first peripheral surface 14 and the driving head group 30 are roughly cross-shaped for easy rotation.

6. Please refer to FIG. 8 and FIG. 9 , a plurality of palm wrench structures can be assembled with each other and are not limited by the angle. For example, the drive head assembly 30 and the assembly portion 11 are concentric. , or when the driving head set 30 and the set portion 11 are formed in a ninety-degree shape, the first action end 34 of the palm wrench structure can be used with the second action of another palm wrench structure The ends 35 are assembled and assembled together and cannot be separated from each other.

7. Referring to FIG. 10, when the assembly portion 11 and the driving head assembly 30 are integrally formed, the cost of the present invention is reduced.

8. The coupling member 40 is inserted through the first pivot portion 12 and the second pivot portion 31 , and the second coupling portion 41 is screwed together with the first coupling portion 32 , so that the driving head group 30 It is pivoted with the first pivot portion 12 .

Therefore, the palm-type wrench structure of the present invention has industrial applicability, novelty and progress, and can sincerely meet the application requirements for an invention patent, and an application can be filed in accordance with the law.

10: Ontology

11: Organization Department

12: The first pivot

13: The first container

14: First week face

15: Notch

30: Drive head group

31: Second pivot

32: The first joint

34: The first acting end

35: The second acting end

36: Second end face

40: Bonding pieces

41: The second joint

50: elastic element

Claims (12)

A palm-type wrench structure, which comprises: a main body, the main body is provided with two sets of setting parts, the two sets of setting parts are connected to the two ends of the main body, and the two sets of setting parts are relatively symmetrical relative to the main body , the set part is roughly C-shaped, and each set part is provided with two first pivot parts, the first pivot part runs through the set part, and the set part is provided with a first peripheral surface, The first peripheral surface is arranged on the inner peripheral surface of the set portion, and a gap is formed at the opening of the set portion. The gap and the axis of the first pivot portion are formed at a ninety degree shape. The two ends are provided with two first end surfaces; there is a first distance between the first pivot part of one set part and the axes of the two first pivot parts of the other set part, and the first The length of the distance is less than the length of the main body, and the first distance is also the distance between the two axis centers of the two first peripheral surfaces; two driving head groups, each driving head group is pivoted with each set part It is assumed that the driving head group rotates in the first peripheral surface with the two first pivots as the axes, the outer diameter of the driving head group is slightly smaller than the diameter of the first peripheral surface, and the driving head group is set There are two second pivot parts, each second pivot part is relatively positive with each first pivot part, a first joint part is arranged inside the second pivot part, and the first joint part is in the shape of an internal thread, One drive head set is provided with a first action end, the first action end is in the shape of a protruding quadrangular head, and the other drive head set is provided with a second action end, and the second action end is in the shape of a quadrangular groove, The specification of the second acting end is the same as the specification of the first acting end, one of which is a male specification and the other is a female specification. The main body and the two driving head sets are pivoted, the two coupling parts are pivoted with the assembly part, and one end of the coupling part is passed through the first pivot part and the second pivot part, the coupling part The part is provided with a second joint part, and the second joint part is connected with the first joint part. The joint parts are screwed together, so that the driving head assembly is pivoted at the first pivoting place by the two joint parts, and the second joint part is in the shape of an external thread. The palm-type wrench structure as claimed in claim 1, wherein the system is a palm-type tool for holding and rotating by hand, the first pivot portion is in the shape of a circular hole, and an outer side of the first pivot portion is provided with a The first accommodating groove, the first accommodating groove is in the shape of communication with the first pivot portion, the first accommodating groove is in the shape of a circular groove, and the diameter of the first accommodating groove is slightly larger than the diameter of the first pivot portion, The two first end surfaces are in the shape of overlapping surfaces, and the first end surface is in the shape of a plane; the head of the coupling element is accommodated in the first accommodating groove. The palm wrench structure as claimed in claim 1, wherein the second working end penetrates the groove or does not penetrate the driving head set, and the first working end and the second working end can be used with sockets of corresponding specifications Hand tools such as parts, connecting rods, and adapter parts are nested with each other, and the second end face is in a plane shape. The palm wrench structure as claimed in claim 1, wherein the inner system of the driving head set with the first acting end can have the function of a ratchet structure. The palm-type wrench structure as claimed in claim 1, wherein the driving head set with the second acting end is adjusted upward at an angle of ninety degrees with the two first pivots as the axes, that is, with the When the axis of the driving head set at the second acting end is vertical to the axis of the set part, the second end face of the driving head set is opposite to the notch, and the second end face is opposite to the first One end face is flush or slightly flush. The palm wrench structure as claimed in claim 1, wherein the coupling piece and the first pivot are in a loose fit state, the coupling piece is a screw-joint structure, and the number of the coupling pieces is four . The palm wrench structure as claimed in claim 1, wherein a plurality of elastic elements are provided, the elastic elements are accommodated in the first pivot portion, the elastic elements are sleeved on the joint, and the elastic elements are elastic Abutting between the driving head set and the coupling piece, the elastic element is a spring structure, and the number of the elastic elements is four; the two coupling pieces and the two elastic elements are relatively symmetrical to the driving head set . The palm wrench structure as claimed in claim 1, wherein the states of the first working end and the second working end can be changed according to requirements, and both the first working end and the second working end are in the shape of quadrangular grooves , or both the first action end and the second action end are in the shape of a square head, or one is in the shape of a square head, and the other is in the shape of a square groove, and the assembly portion can be assembled with the same first peripheral surface The drive head group with the same outer diameter. The palm-type wrench structure according to claim 1, wherein the number of the palm-type wrench structure is two or more, the driving head group and the set part are coaxially shaped, and the palm-type wrench structure is concentric. The first action end of the structure is sleeved with the second action end of another palm-type wrench structure, so that the two palm-type spanner structures are assembled together and cannot be separated from each other, and the plurality of palm-type spanner structures are assembled in sequence. Set to a longer ratchet-like wrench structure. The palm-type wrench structure according to claim 1, wherein the number of the palm-type wrench structure is two or more, and the driving head set is based on the two first pivots and the two joints as the axis Adjust the angle so that the axis of the drive head group and the axis of the assembly part are in a 90-degree shape, so that the second end face is facing the gap, the second end face is tangent to the first end face, and the The first working end of the palm wrench structure is fitted with the second working end of another palm wrench structure, so that the two palm wrench structures are assembled together and cannot be separated from each other, and the plurality of palm wrench structures are A longer ratchet wrench-like structure is formed in sequence. The palm-type wrench structure as claimed in claim 1, wherein a set portion thereof and a drive head set are integrally formed. The palm wrench structure as claimed in claim 11, wherein the handle of the main body has a third action end, one end of the third action end is open, and the size of the third action end is smaller than that of the second action end The third action end is in the shape of a four-cornered groove, the second action end is in a three-point size, the third action end is in a two-point size, or the second action end is in a quarter size, and the third action end is in a quarter size. The action end of the piece is in a three-point specification.

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