JPH0739555Y2 - Jig device for work assembly - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is assembled by assembling a plurality of parts to a base body, such as a retractable head of an automobile, and is housed in an opening formed in the main work to be attached to the main work. The present invention relates to a jig device for assembling a sub work to be assembled.

[0002]

2. Description of the Related Art For example, a retractable headlamp for an automobile is assembled by assembling a headlight, a motor, an outer cover component (so-called lid) and the like on a base portion with bolts and nuts and the like, and assembling it to a vehicle body. At the time of mounting, the retractable headlamp is housed in the opening formed in the side portion of the front upper surface of the vehicle body in its assembled state, and the base portion is fixed to a predetermined position of the vehicle body by bolts, nuts or the like. As a result, it is assembled to the vehicle body.

In this case, in particular, the outer surface cover component is
Since it is a component exposed on the outer surface of the vehicle body, a predetermined gap is required between the outer peripheral portion of the outer surface cover component and the opening of the vehicle body for reasons of its appearance and the like. The upper surface of the vehicle is required to have a predetermined height with respect to the hood and fender of the vehicle body.

However, conventionally, the retractable headlamp is assembled independently of the assembling to the vehicle body. Therefore, when the retractable headlamp is assembled to the vehicle body in the assembled state, In many cases, the positional relationship between the outer surface cover component and the opening of the vehicle body and its surroundings does not satisfy the above requirements.

In such a case, since the retractable headlamp is housed in the opening of the vehicle body in a state where the retractable headlamp is mounted on the vehicle body, the mounting position of the outer surface cover member cannot be adjusted. Therefore, the retractable headlamp is detached from the vehicle body again to adjust the assembly position of the outer surface cover component, and after the adjustment, the retractable headlamp is assembled again to the vehicle body.

However, in this way, the retractable headlamp has to be detached from the vehicle body when adjusting the assembly position of the outer surface cover component, so that there is an inconvenience that the adjustment work is troublesome.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned inconvenience and is assembled by assembling a plurality of parts to a base part, and in the assembled state is housed in an opening formed in a main work and the base part is formed. Jig device for assembling a sub-work to be attached to a main work via a part so that the positional relationship between the main work and the opening of the main work and its surroundings becomes a predetermined positional relationship when the sub-work is attached to the main work. The purpose is to provide.

[0008]

In order to achieve such an object, the present invention is assembled by assembling a plurality of parts to a base part, and is housed in an opening formed in a main work in the assembled state. A jig device for assembling a sub-work to be assembled to a main work via the base body,
A support body for positioning and supporting the base body portion of the sub-work in a state in which the parts can be assembled, and the base body portion which is disposed around the support body and is supported by the support body. The opening and the periphery of the main work are provided in a substantially same positional relationship with the opening of the main work in a mounted state, and the pseudo opening is formed in substantially the same shape as the opening, and the pseudo opening is the support. It is characterized in that the component is movably provided at a position away from the base so that the component can be assembled to the base supported by the body.

Further, the main work and the sub-work are a car body and a retractable headlamp, respectively, and the pseudo opening has an outer surface cover component supported on the support member among the components of the retractable headlamp. A peripheral surface abutting portion which comes into contact with at least one of the front and rear side surfaces of the outer surface cover component and one of the side surface portions thereof when assembled to the base portion at a predetermined position, and the outer surface cover component. And an upper surface abutting portion that abuts an upper surface portion of the.

[0010]

According to the present invention, when assembling the sub-work, the base portion is positioned and supported on the support, and the pseudo opening is moved to a position away from the base portion. Then, the sub-work is assembled by assembling the parts to the base portion. Then, after the assembly, if the pseudo opening is returned to the original position, the positional relationship between the pseudo opening and the sub work is such that the sub work and the main work in the state where the sub work is assembled to the main work. The positional relationship between the opening and the periphery thereof is substantially the same, and therefore, in this state, the positional relationship between the sub-work and the opening of the main work and the periphery thereof can be confirmed.

In this case, when it is necessary to adjust the assembly position of the component of the sub-work, the assembly position of the component is adjusted by simply moving the pseudo opening to a position away from the base portion. It becomes possible to do. Then, after the adjustment, if the sub-work is assembled to the main work via the base portion, the sub-work is assembled to the main work at a desired position.

Further, the main work and the sub-work are a car body and a retractable headlamp, respectively, and when the pseudo opening includes the peripheral surface abutting portion and the upper surface abutting portion, the retractable headlamp is the above-mentioned. When assembling on the support body as described above, the outer surface cover component is attached to the base body portion such that the peripheral surface portion abuts on the peripheral surface abutting portion of the pseudo opening and the upper surface abuts on the upper surface abutting portion. If assembled, the outer surface cover component is assembled to the vehicle body at a predetermined position when the retractable headlamp is assembled to the vehicle body.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An example of a jig device for assembling a work according to the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view of a retractable headlamp for an automobile, which is an example of a sub work, and FIG. 2 is a line II- of FIG.
II line sectional view, FIG. 3 is a III-III line sectional view of FIG.
4 is a perspective view of the assembly jig device, FIG. 5 is a side elevational vertical cross-sectional view of FIG. 4, and FIG. 6 is an operation explanatory view taken along the line VI-VI of FIG. 2 and 3, only the main part of the retractable headlamp is shown.

In FIG. 1, this retractable headlamp W (hereinafter, simply referred to as headlamp W) has an opening formed on a hood B and a front fender C on an upper surface of a front part of a vehicle body A of an automobile, which is a main work. It is housed in D and assembled to the vehicle body A as described later.

In this case, as shown in FIGS. 2 and 3, the headlamp W includes a base portion a directly attached to the vehicle body A, and a lid b which is an outer surface cover component mounted on the base portion a. The base portion a is composed of a fixed bracket c fixed to the vehicle body W and a pair of swing plates d vertically swingably provided from both sides of the fixed bracket c, and the lid b is The swing plate d is swingably mounted integrally with the swing plate d.

More specifically, the fixing bracket c of the base portion a has a pair of positioning pins e, e projecting downward from both side portions of the front portion thereof, and is provided at both side portions of the rear portion thereof. A pair of screw holes f, f, and inside the opening D of the vehicle body A, positioning pins e, e are provided in a pair of positioning holes E, E formed in the front part of the bottom of the opening D. It is fixed to the vehicle body A by fitting and inserting and by screwing a pair of bolts F, F together with the vehicle body A into the screw holes f, f in this state.

The lid b is mounted on the swing plates d, d from above so that the swing plates d, d are sandwiched between the side wall portions of the lid b. At the time of attachment to the lid b, a pair of elongated holes g, g formed in each side wall portion of the lid b and extending in the front-rear direction are opposed to the screw holes h, h formed in each swing plate d. In this state, bolts i are screwed into the screw holes h from the outside of the lid b via the elongated holes g, so that the bolts are integrally swingably attached to the swing plates d.

In this case, since each elongated hole g of the lid b into which the bolt i is inserted extends in the front-rear direction, the mounting position of the lid b on the swing plates d, d is the elongated hole g. It is possible to adjust in the front-back direction via.

Further, as shown in FIG. 2, when the lid b is mounted on the swing plates d, d, the bolt i is appropriately positioned between each side wall portion of the lid b and each swing plate d. A spacer j having a uniform thickness is interposed, and the spacer j
The attachment position of the lid b to the swing plates d, d can be adjusted in the width direction by appropriately changing the thickness of the.

Further, as shown in FIG. 3, at the lower end of the swing plate d, the tip of an adjusting screw k screwed to the side of the fixed bracket c toward the lower end of the swing plate d. The parts are in contact with each other, and the heights of the swing plate d and the lid b attached thereto can be adjusted by appropriately adjusting the screwing amount of the adjusting screw k.

Inside the lid b, a headlamp body m (shown in phantom in FIG. 3) is swingably attached to the swing frames d, d integrally therewith, and the lid b and the headlamp body are also provided. A motor (not shown) for swinging m via swing plates d, d is a fixed bracket c.
Fixed to.

When the headlamp W is assembled to the vehicle body A, the base part a and the lid b and other components are assembled together, and the headlamp W is housed in the opening D and fixed to the base part a. The bracket c is attached and fixed to the vehicle body A as described above, whereby the headlamp W is assembled to the vehicle body A.

At this time, when the headlamp W is assembled to the vehicle body A in a normal state, a predetermined gap is formed between the lid b and the upper edge of the opening D.

Next, the structure of the assembling jig device for assembling the headlamp W will be described with reference to FIGS. 1 to 3 with reference to FIGS. 4 and 5.

In FIGS. 4 and 5, reference numeral 1 is a rotary base mounted on the fixed base 2 via a rotary plate 3 so as to be rotatable, and 4 is the headlamp W mounted on the rotary base 1. Supports 5 of the base portion a are pseudo openings corresponding to the openings D of the vehicle body A provided around the support 4.

A cylindrical body 6 is fixedly provided on the periphery of the rotary base 1, and a locking pin 7 is vertically movably inserted into the cylindrical body 6.

The locking pin 7 is urged downward by a spring 8 wound around the locking pin 7 in the tubular body 6, while the upper end portion of the tubular body 6 protruding upward is A spherical operation knob 8 is integrally formed, and the lower end portion of the cylindrical body 6 protruding downward faces the fixed base 2 through a through hole 9 formed in the rotary base 1. It extends so as to be removably fitted into a locking hole 10 formed in the fixed base, whereby the rotation base 1 is locked so as not to rotate. The lower end of the locking pin 7 is pulled out from the locking hole 10 by lifting the locking pin 7 through the operation knob 8. In this pulled-out state, the rotation base 1 is rotatable. I am trying to.

In this case, although not shown, a plurality of locking holes 10 are provided in the circumferential direction around the turntable 3, and the rotary base 1 is engaged in a rotatable state after being rotated in a freely rotatable state. By inserting the stop pin 7 into any one of the locking holes 10,
It can be locked at a plurality of turning positions.

The support 4 has the fixing bracket c of the base portion a of the headlamp W and the screw holes f and f (see FIG. 2).
A pair of stanchions 11a, 11a erected on the rotary base 1 to be supported at the position, and a fixing bracket c in front of both stanchions 11a, 11a, the positioning pins e, e (see FIG. 2).
And a pair of columns 11b, 11b that are erected on the rotary base 1 so as to be supported at the position. In this case, as shown in FIG. 5, the upper surfaces of the columns 11a and 11b are inclined so that the fixed bracket c can be supported in a posture substantially the same as the posture of attachment to the vehicle body A. And the columns 11a and 11a
Positioning pins 12, 12 that can be fitted into the screw holes f, f of the fixed bracket c are provided on the upper surface of the support bracket 11a, while the positioning pins e, e of the fixed bracket c are mounted on the upper surfaces of the columns 11b, 11b. Locating holes 13, 13 into which can be inserted are formed, and the fixing bracket c supported on these columns 11a, 11b is positioned by the locating pin 12 and the locating hole 13.

Clampers 14 and 14 for clamping the rear portion of the fixed bracket c supported on the columns 11a and 11a are attached to the back surface of the upper portions of the columns 11a and 11a. As shown in FIG. 5, it is provided with a swinging arm 16 having a substantially dogleg shape extending swingably from a base portion 15 fixed to the column 11a, and a rear portion of the fixed bracket c is provided on the column 11a. In the supported state, the spherical locking portion 16a formed at the tip of the swing arm 16 is swung toward the upper surface of the rear portion of the fixed bracket c to be pressed against the upper surface. At this time, the rear portion of the fixed bracket c is clamped between the locking portion 16a and the column 11a.

The main portion of the pseudo opening portion 5 is formed on both sides of the support body 4 so as to form pseudo side edges of the upper end portion of the opening portion D of the vehicle body A (see FIGS. 1 to 3). A pair of plate-shaped opening side portion forming members 17, 17 disposed in
It is configured by a plate-shaped opening rear portion forming body 18 arranged behind the support body 4 so as to form a rear edge portion (see FIGS. 1 to 3) of the upper end portion of the opening portion D in a pseudo manner.

In this case, the opening side part forming members 17, 17 are
The inner side surface portion and the upper surface portion are formed in the same shape as both side edge portions of the upper end portion of the opening D of the vehicle body A, and the inner side surface portion and the upper surface portion are fixed to the base portion a supported by the support body 4. It is arranged at a position where the positional relationship with the bracket c is the same as the positional relationship between the fixed bracket c of the base portion a attached to the vehicle body A and both side edges of the upper end of the opening D.

Further, similarly to this, the opening rear portion forming member 18
The inner side surface portion and the upper surface portion are formed in the same shape as the rear edge portion of the upper end portion of the opening D of the vehicle body A, and the inner side surface portion and the upper surface portion and the base portion a supported by the support body 4 are formed.
Is arranged at a position where the positional relationship with the fixed bracket c is the same as the positional relationship between the fixed bracket c of the base body a attached to the vehicle body A and the rear edge of the upper end of the opening D. .

As shown in FIG. 5, in each opening side part forming body 17, a lower end part of an extending body 19 extending downward from an outer side surface part thereof is erected on the rotary base 1. Prop body 2
0 is loosely inserted in a groove portion 21 formed in the upper end portion of the 0, and is pivotally supported in the groove portion 21 by a support shaft 20 via a support shaft 22.
As a result, the support shaft 22 is supported and the support shaft 22
It is swingable back and forth around.

In this case, in each opening side part forming body 17, as shown by the solid line in the figure, the front surface part of the extending body 19 is in contact with the stopper body 23 extending upward from the front surface part of the column body 20. A support shaft is provided between the contacting position and the position where the rear surface of the lower end of the extension body 19 abuts against the stopper inclined surface 24 formed at the bottom of the groove 21 as shown by the phantom line in FIG. It is swingable around 22. Then, each opening side part forming body 17 forms a side edge part of the opening part D of the vehicle body A in a pseudo manner when it is swung to the position shown by the solid line in the figure (hereinafter, referred to as a pseudo opening forming position). Components of the headlamp W such as the lid b on the base portion a supported by the support body 4 via the fixing bracket c when swung to the position shown by the phantom line in the figure (hereinafter referred to as the assembling position). Can be assembled.

In this case, the extension body 19 is made of a metal material such as iron, and the magnet 25 is fixed to the back surface of the stopper body 22.
The magnet 7 is locked by the magnet 25 through the extension body 19 at the pseudo opening forming position.

The opening rear part forming body 18 is, like the opening side part forming bodies 17, the extension body 2 vertically provided from the lower surface part thereof.
6, a stopper body 28 that is swingably supported around a support shaft 28 by a support body 27 that is erected on the rotary base 1 and that extends upward from the front surface of the support body 27. And the stopper inclined surface 30 formed on the bottom surface of the groove 29 of the pillar 27 into which the lower end of the extension body 26 is loosely inserted.
It is swingable between a pseudo opening forming position shown by a solid line and an assembling position shown by a virtual line in the figure. The opening rear portion forming body 18, like the opening side portion forming bodies 17, also artificially forms the rear edge portion of the opening portion D of the vehicle body A when swung to the pseudo opening forming position, and is assembled. The constituent parts of the headlamp W can be assembled to the base portion a supported by the support 4 when swung to the possible position.

The pseudo opening 5 is attached to the base portion a of the headlamp W supported by the support 4 when the lid b is assembled to the pseudo opening 5 at a predetermined position. b a pair of side surface contact portions 31 contacting one side surface portion
a, 31a, a pair of rear surface contact portions 31b, 31b contacting the rear surface portion of the lid b, and a plurality (three in this embodiment) of upper surface contact portions 32 contacting the upper surface portion of the lid b. The side surface contact portion 31a and the rear surface contact portion 31b constitute the peripheral surface contact portion 31, which is a main component of the present invention.

The side surface abutting portions 31a, 31a are fixed to the upper end portions of the inner side surface portions of both the opening side portion forming bodies 17, 17 with a front-rear space at a front end surface portion of each side surface abutting portion 31a. An elastic member 33 made of rubber or the like is attached to the. Also,
Similarly, the rear surface abutting portions 31b, 31b are fixed to the front surface portion of the opening rear portion forming body 18 at intervals in the width direction, and the elastic member 34 is adhered to the front end surface portion thereof.

Then, these contact portions 31a, 31b
When the lid b of the headlamp W mounted on the vehicle body A is mounted on the base portion a supported by the support 4 at a position where a predetermined gap is formed between the lid b of the headlamp W and the upper end peripheral portion of the opening D. At the pseudo opening forming positions of the opening side portion forming bodies 17 and the opening rear portion forming bodies 18, they are brought into contact with one side surface portion and the rear surface portion of the lid b via elastic members 33 and 34.

One of the upper surface abutting portions 32 is formed by an arm piece 36 rotatably pivotally attached to the upper surface portion of the opening rear portion forming body 18 through a shaft pin 35, and the remaining upper surface abutting portion 32. 32 is an axial pin 3 on the upper surface of each opening side part forming body 17.
It is formed by an arm piece 38 that is pivotally attached via a shaft 7. In this case, at the pseudo opening forming positions of the opening side part forming body 17 and the opening rear part forming body 18, the tip ends of the arm pieces 36, 38 have these forming bodies 17, 1 respectively.
8 is pivotable to a position projecting inward, and an elastic member 39 is attached to the lower surface of the tip.

These upper surface abutting portions 32 are provided at a position where the lid b of the headlamp W assembled to the vehicle body A has a predetermined height with respect to the upper surface portion of the vehicle body W.
When the tip end of each arm piece 36, 38 is assembled to the base body a supported by the above, and is rotated to a position projecting to the inside of the opening side part forming body 17 and the opening rear part forming body 18. In addition, the upper surface of the lid b is abutted via the elastic member 39.

Next, the operation of the jig device for assembly will be described with reference to FIG.
5 to FIG. 6 with reference to FIG.

In FIG. 5, when the headlamp W is assembled, first, the base portion a is supported on the columns 11a and 11b of the support body 4 via the fixing bracket c.

At this time, the positioning pin 12 of the support 11a is fitted into the screw hole f of the fixed bracket c, and the positioning pin e of the fixed bracket c is fitted into the positioning hole 13 of the support 11b. a is support 4
Positioned on top. Further, the fixing bracket c of the base portion a is clamped by the clamper 14 as described above.

After this, the components of the headlamp W such as the lid b are assembled to the base portion a as described above, and the headlamp W is assembled on the support body 4 by this.

At this time, both the opening side portion forming bodies 17, 17 and the opening rear portion forming body 18 of the pseudo opening portion 5 are swung to the assembling position as shown by the phantom line in FIG.

At this time, the rotary base 1 is appropriately rotated to a position suitable for its assembling work, and the rotary base 1 is locked to the fixed base 3 by the locking pin 7 as described above. To be done.

Then, after such assembly, both the opening side part forming bodies 17, 17 and the opening rear part forming body 18 are swung to the pseudo opening forming position as shown by the solid line in FIG. The tip ends of the arm pieces 36, 38 of the portion 32 are rotated to a position overhanging toward the headlamp W on the support 4.

At this time, as shown in FIG. 6, the side surface abutting portion 31a and the rear surface abutting portion 31b both abut on one side surface portion of the lid b, and the upper surface abutting portions 32 are both abutting. When it comes into contact with the upper surface of the lid b, the pseudo opening 5
The lid b is assembled to the base body a at a predetermined position, in other words, at a predetermined position with respect to the opening D of the vehicle body A. Therefore, the assembly of the headlamp W is completed as described above. Then, if the headlamp W is assembled to the vehicle body A after the assembly, the headlamp W is assembled to the vehicle body at a predetermined position with respect to the vehicle body A.

On the other hand, for example, when one side surface portion of the lid b is separated from the side surface contact portion 31a, as described above, the thickness of the spacer j is appropriately changed so that the lid b is formed as a base portion. By reassembling to the a, the assembling of the lid b to the base body a is adjusted appropriately in the width direction so that the one side surface portion of the lid b contacts the side surface contact portion 31a.

Further, for example, when the rear surface portion of the lid b is separated from the rear surface contact portion 31b, as described above, the lid b is inserted through the elongated hole g (see FIG. 3) of the lid b.
By adjusting the assembling position in the front-rear direction to the base portion a, the assembling positions of the lid b in the front and rear are adjusted so that the rear surface portion of the lid b contacts the rear surface contact portion 31b.

Further, for example, when the upper surface of the lid b is separated from the upper surface contact portion 32, as described above, the screwing amount of the adjusting screw k (see FIG. 3) is appropriately adjusted. Thus, the height of the lid b is adjusted so that the upper surface portion of the lid b contacts the upper surface contact portion 32.

By this adjustment, both the side surface abutting portion 31a and the rear surface abutting portion 31b are brought into contact with one side surface portion of the lid b, and the respective upper surface abutting portions 32 of the lid b are both provided. When the headlamp W is brought into contact with the upper surface portion, the assembling of the headlamp W is completed as described above, and if the headlamp W is assembled to the vehicle body A after the assembling, the headlamp W is mounted at a predetermined position with respect to the vehicle body A. It is attached to the vehicle body.

In the above adjustment, when reassembling the lid b to the base portion a, both the opening side portion forming bodies 17 and 1 are formed.
7 and the opening rear portion forming body 18 are swung to the assembling position, and in this state, the lid b is reassembled while the base body portion a is supported on the support body 4.

According to such an assembling jig device, the headlamp W is assembled on the support 4, and at the time of this assembling, the lid b is assembled so as to abut on the abutting portions 31a, 31b, 32. If the headlamp W is attached to the vehicle body A,
When the headlamp W is mounted on the vehicle body A, the headlamp W is mounted on the vehicle body A at a predetermined position. When assembling the headlamp W, it is possible to easily adjust the mounting position of the lid b on the support 4.

[0058]

As is apparent from the above description, according to the present invention, the work is performed by assembling the parts on the base part with the base part of the sub-work being positioned and supported on the support. By assembling and providing a pseudo opening corresponding to the opening of the main work around the base portion, the positional relationship between the sub work and the opening of the main work assembled on the support is supported. It is possible to confirm the positional relationship between the sub-work and the pseudo opening on the body, and if the sub-work is assembled so as to be at a predetermined position with respect to the pseudo opening, the sub-work can be surely set to the predetermined position. It can be installed in the opening of the main work depending on the position.

When the main work and the sub-work are a vehicle body and a retractable headlamp, respectively, and the pseudo opening has a peripheral surface abutting portion and a top surface abutting portion, the retractable headlamp is assembled. In addition, the outer cover component of the headlamp is attached to the base body part of the headlamp so that the peripheral surface portion and the upper surface portion of the outer cover component of the headlamp come into contact with the peripheral surface contact portion. The headlamp can be assembled to the vehicle body so as to be surely at a predetermined position with respect to the opening portion, and the positional relationship between the outer surface cover component and the opening portion of the vehicle body is
It can be easily confirmed in the pseudo opening.

[Brief description of drawings]

FIG. 1 is a perspective view of a retractable headlamp for an automobile, which is an example of a sub work.

FIG. 2 is a sectional view taken along line II-II of FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a perspective view of an example of an assembly jig device of the present invention.

5 is a side elevational vertical sectional view of FIG.

6 is an operation explanatory view of a cross section taken along the line VI-VI of FIG.

[Explanation of symbols]

A: Car body (main work)
5 ... Pseudo opening W ... Retractable headlamp (sub work)
31 ... Peripheral surface contact portion D ... Opening portion
32 ... Top contact part a ... Base part b ... Lid (outer surface cover part) 4 ... Support

Claims (2)

[Scope of utility model registration request] 1. A sub-work, which is assembled by assembling a plurality of parts to a base part, is accommodated in an opening formed in the main work in the assembled state, and is attached to the main work via the base part. A jig device for assembling, comprising: a support body for positioning and supporting the base portion of the sub-work in a state in which the parts can be assembled; and a support body disposed around the support body,
With respect to the base portion supported by the support body, the base portion and the opening portion of the main work have substantially the same positional relationship as that in the assembled state, and the opening portion and the periphery thereof have substantially the same shape. And a pseudo opening formed therein, wherein the pseudo opening is movably provided at a position away from the base so that the component can be assembled to the base supported by the support. Jig device for assembling workpieces. 2. The main work and the sub work are an automobile body and a retractable headlamp, respectively, and the pseudo opening has an outer surface cover component supported on the support member among the components of the retractable headlamp. A peripheral surface abutting portion which comes into contact with at least one of the front and rear side surfaces of the outer surface cover component and one of the side surface portions thereof when assembled to the base portion at a predetermined position, and the outer surface cover component. 2. The jig device for assembling a workpiece according to claim 1, further comprising an upper surface abutting portion that abuts an upper surface portion of the workpiece.